#ifndef INCLUDE_CCAPI_CPP_CCAPI_HMAC_H_
#define INCLUDE_CCAPI_CPP_CCAPI_HMAC_H_
// https://github.com/Yubico/yubico-c-client/blob/ykclient-2.15/hmac.c
/**************************** hmac.c ****************************/
/******************** See RFC 4634 for details ******************/
/*
 *  Description:
 *      This file implements the HMAC algorithm (Keyed-Hashing for
 *      Message Authentication, RFC2104), expressed in terms of the
 *      various SHA algorithms.
 */

//#include "sha.h"
/**************************** sha.h ****************************/
/******************* See RFC 4634 for details ******************/
#ifndef _SHA_H_
#define _SHA_H_

/*
 *  Description:
 *      This file implements the Secure Hash Signature Standard
 *      algorithms as defined in the National Institute of Standards
 *      and Technology Federal Information Processing Standards
 *      Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
 *      published on August 1, 2002, and the FIPS PUB 180-2 Change
 *      Notice published on February 28, 2004.
 *
 *      A combined document showing all algorithms is available at
 *              http://csrc.nist.gov/publications/fips/
 *              fips180-2/fips180-2withchangenotice.pdf
 *
 *      The five hashes are defined in these sizes:
 *              SHA-1           20 byte / 160 bit
 *              SHA-224         28 byte / 224 bit
 *              SHA-256         32 byte / 256 bit
 *              SHA-384         48 byte / 384 bit
 *              SHA-512         64 byte / 512 bit
 */

#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <stdint.h>
#include <iomanip>
/*
 * If you do not have the ISO standard stdint.h header file, then you
 * must typedef the following:
 *    name              meaning
 *  uint64_t         unsigned 64 bit integer
 *  uint32_t         unsigned 32 bit integer
 *  uint8_t          unsigned 8 bit integer (i.e., unsigned char)
 *  int_least16_t    integer of >= 16 bits
 *
 */
namespace yubico {
#ifndef _SHA_enum_
#define _SHA_enum_
/*
 *  All SHA functions return one of these values.
 */
enum {
  shaSuccess = 0,
  shaNull,         /* Null pointer parameter */
  shaInputTooLong, /* input data too long */
  shaStateError,   /* called Input after FinalBits or Result */
  shaBadParam      /* passed a bad parameter */
};
#endif /* _SHA_enum_ */

/*
 *  These constants hold size information for each of the SHA
 *  hashing operations
 */
enum {
  SHA1_Message_Block_Size = 64,
  SHA224_Message_Block_Size = 64,
  SHA256_Message_Block_Size = 64,
  SHA384_Message_Block_Size = 128,
  SHA512_Message_Block_Size = 128,
  USHA_Max_Message_Block_Size = SHA512_Message_Block_Size,

  SHA1HashSize = 20,
  SHA224HashSize = 28,
  SHA256HashSize = 32,
  SHA384HashSize = 48,
  SHA512HashSize = 64,
  USHAMaxHashSize = SHA512HashSize,

  SHA1HashSizeBits = 160,
  SHA224HashSizeBits = 224,
  SHA256HashSizeBits = 256,
  SHA384HashSizeBits = 384,
  SHA512HashSizeBits = 512,
  USHAMaxHashSizeBits = SHA512HashSizeBits
};

/*
 *  These constants are used in the USHA (unified sha) functions.
 */
typedef enum SHAversion { SHA1, SHA224, SHA256, SHA384, SHA512 } SHAversion;

/*
 *  This structure will hold context information for the SHA-1
 *  hashing operation.
 */
typedef struct SHA1Context {
  uint32_t Intermediate_Hash[SHA1HashSize / 4]; /* Message Digest */

  uint32_t Length_Low;  /* Message length in bits */
  uint32_t Length_High; /* Message length in bits */

  int_least16_t Message_Block_Index; /* Message_Block array index */
  /* 512-bit message blocks */
  uint8_t Message_Block[SHA1_Message_Block_Size];

  int Computed;  /* Is the digest computed? */
  int Corrupted; /* Is the digest corrupted? */
} SHA1Context;

/*
 *  This structure will hold context information for the SHA-256
 *  hashing operation.
 */
typedef struct SHA256Context {
  uint32_t Intermediate_Hash[SHA256HashSize / 4]; /* Message Digest */

  uint32_t Length_Low;  /* Message length in bits */
  uint32_t Length_High; /* Message length in bits */

  int_least16_t Message_Block_Index; /* Message_Block array index */
  /* 512-bit message blocks */
  uint8_t Message_Block[SHA256_Message_Block_Size];

  int Computed;  /* Is the digest computed? */
  int Corrupted; /* Is the digest corrupted? */
} SHA256Context;

/*
 *  This structure will hold context information for the SHA-512
 *  hashing operation.
 */
typedef struct SHA512Context {
#ifdef USE_32BIT_ONLY
  uint32_t Intermediate_Hash[SHA512HashSize / 4]; /* Message Digest  */
  uint32_t Length[4];                             /* Message length in bits */
#else                                             /* !USE_32BIT_ONLY */
  uint64_t Intermediate_Hash[SHA512HashSize / 8]; /* Message Digest */
  uint64_t Length_Low, Length_High;               /* Message length in bits */
#endif                                            /* USE_32BIT_ONLY */
  int_least16_t Message_Block_Index;              /* Message_Block array index */
  /* 1024-bit message blocks */
  uint8_t Message_Block[SHA512_Message_Block_Size];

  int Computed;  /* Is the digest computed? */
  int Corrupted; /* Is the digest corrupted? */
} SHA512Context;

/*
 *  This structure will hold context information for the SHA-224
 *  hashing operation. It uses the SHA-256 structure for computation.
 */
typedef struct SHA256Context SHA224Context;

/*
 *  This structure will hold context information for the SHA-384
 *  hashing operation. It uses the SHA-512 structure for computation.
 */
typedef struct SHA512Context SHA384Context;

/*
 *  This structure holds context information for all SHA
 *  hashing operations.
 */
typedef struct USHAContext {
  int whichSha; /* which SHA is being used */
  union {
    SHA1Context sha1Context;
    SHA224Context sha224Context;
    SHA256Context sha256Context;
    SHA384Context sha384Context;
    SHA512Context sha512Context;
  } ctx;
} USHAContext;

/*
 *  This structure will hold context information for the HMAC
 *  keyed hashing operation.
 */
typedef struct HMACContext {
  int whichSha;           /* which SHA is being used */
  int hashSize;           /* hash size of SHA being used */
  int blockSize;          /* block size of SHA being used */
  USHAContext shaContext; /* SHA context */
  unsigned char k_opad[USHA_Max_Message_Block_Size];
  /* outer padding - key XORd with opad */
} HMACContext;
/*
 *  Function Prototypes
 */

/* SHA-1 */
int SHA1Reset(SHA1Context *);
int SHA1Input(SHA1Context *, const uint8_t *bytes, unsigned int bytecount);
int SHA1FinalBits(SHA1Context *, const uint8_t bits, unsigned int bitcount);
int SHA1Result(SHA1Context *, uint8_t Message_Digest[SHA1HashSize]);

/* SHA-224 */
int SHA224Reset(SHA224Context *);
int SHA224Input(SHA224Context *, const uint8_t *bytes, unsigned int bytecount);
int SHA224FinalBits(SHA224Context *, const uint8_t bits, unsigned int bitcount);
int SHA224Result(SHA224Context *, uint8_t Message_Digest[SHA224HashSize]);

/* SHA-256 */
int SHA256Reset(SHA256Context *);
int SHA256Input(SHA256Context *, const uint8_t *bytes, unsigned int bytecount);
int SHA256FinalBits(SHA256Context *, const uint8_t bits, unsigned int bitcount);
int SHA256Result(SHA256Context *, uint8_t Message_Digest[SHA256HashSize]);

/* SHA-384 */
int SHA384Reset(SHA384Context *);
int SHA384Input(SHA384Context *, const uint8_t *bytes, unsigned int bytecount);
int SHA384FinalBits(SHA384Context *, const uint8_t bits, unsigned int bitcount);
int SHA384Result(SHA384Context *, uint8_t Message_Digest[SHA384HashSize]);

/* SHA-512 */
int SHA512Reset(SHA512Context *);
int SHA512Input(SHA512Context *, const uint8_t *bytes, unsigned int bytecount);
int SHA512FinalBits(SHA512Context *, const uint8_t bits, unsigned int bitcount);
int SHA512Result(SHA512Context *, uint8_t Message_Digest[SHA512HashSize]);

/* Unified SHA functions, chosen by whichSha */
int USHAReset(USHAContext *, SHAversion whichSha);
int USHAInput(USHAContext *, const uint8_t *bytes, unsigned int bytecount);
int USHAFinalBits(USHAContext *, const uint8_t bits, unsigned int bitcount);
int USHAResult(USHAContext *, uint8_t Message_Digest[USHAMaxHashSize]);
int USHABlockSize(enum SHAversion whichSha);
int USHAHashSize(enum SHAversion whichSha);
int USHAHashSizeBits(enum SHAversion whichSha);

/*
 * HMAC Keyed-Hashing for Message Authentication, RFC2104,
 * for all SHAs.
 * This interface allows a fixed-length text input to be used.
 */
int hmac(SHAversion whichSha,              /* which SHA algorithm to use */
         const unsigned char *text,        /* pointer to data stream */
         int text_len,                     /* length of data stream */
         const unsigned char *key,         /* pointer to authentication key */
         int key_len,                      /* length of authentication key */
         uint8_t digest[USHAMaxHashSize]); /* caller digest to fill in */

/*
 * HMAC Keyed-Hashing for Message Authentication, RFC2104,
 * for all SHAs.
 * This interface allows any length of text input to be used.
 */
int hmacReset(HMACContext *ctx, enum SHAversion whichSha, const unsigned char *key, int key_len);
int hmacInput(HMACContext *ctx, const unsigned char *text, int text_len);

int hmacFinalBits(HMACContext *ctx, const uint8_t bits, unsigned int bitcount);
int hmacResult(HMACContext *ctx, uint8_t digest[USHAMaxHashSize]);

#endif /* _SHA_H_ */
/*************************** sha-private.h ***************************/
/********************** See RFC 4634 for details *********************/
#ifndef _SHA_PRIVATE__H
#define _SHA_PRIVATE__H
/*
 * These definitions are defined in FIPS-180-2, section 4.1.
 * Ch() and Maj() are defined identically in sections 4.1.1,
 * 4.1.2 and 4.1.3.
 *
 * The definitions used in FIPS-180-2 are as follows:
 */

#ifndef USE_MODIFIED_MACROS
#define SHA_Ch(x, y, z) (((x) & (y)) ^ ((~(x)) & (z)))
#define SHA_Maj(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))

#else /* USE_MODIFIED_MACROS */
                                                  /*
                                                   * The following definitions are equivalent and potentially faster.
                                                   */

#define SHA_Ch(x, y, z) (((x) & ((y) ^ (z))) ^ (z))
#define SHA_Maj(x, y, z) (((x) & ((y) | (z))) | ((y) & (z)))
#endif /* USE_MODIFIED_MACROS */

#define SHA_Parity(x, y, z) ((x) ^ (y) ^ (z))

#endif /* _SHA_PRIVATE__H */
/**************************** sha1.c ****************************/
/******************** See RFC 4634 for details ******************/
/*
 *  Description:
 *      This file implements the Secure Hash Signature Standard
 *      algorithms as defined in the National Institute of Standards
 *      and Technology Federal Information Processing Standards
 *      Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
 *      published on August 1, 2002, and the FIPS PUB 180-2 Change
 *      Notice published on February 28, 2004.
 *
 *      A combined document showing all algorithms is available at
 *              http://csrc.nist.gov/publications/fips/
 *              fips180-2/fips180-2withchangenotice.pdf
 *
 *      The SHA-1 algorithm produces a 160-bit message digest for a
 *      given data stream.  It should take about 2**n steps to find a
 *      message with the same digest as a given message and
 *      2**(n/2) to find any two messages with the same digest,
 *      when n is the digest size in bits.  Therefore, this
 *      algorithm can serve as a means of providing a
 *      "fingerprint" for a message.
 *
 *  Portability Issues:
 *      SHA-1 is defined in terms of 32-bit "words".  This code
 *      uses <stdint.h> (included via "sha.h") to define 32 and 8
 *      bit unsigned integer types.  If your C compiler does not
 *      support 32 bit unsigned integers, this code is not
 *      appropriate.
 *
 *  Caveats:
 *      SHA-1 is designed to work with messages less than 2^64 bits
 *      long. This implementation uses SHA1Input() to hash the bits
 *      that are a multiple of the size of an 8-bit character, and then
 *      uses SHA1FinalBits() to hash the final few bits of the input.
 */

//#include "sha.h"
//#include "sha-private.h"

/*
 *  Define the SHA1 circular left shift macro
 */
#define SHA1_ROTL(bits, word) (((word) << (bits)) | ((word) >> (32 - (bits))))

/*
 * add "length" to the length
 */
static uint32_t addTemp1;
#define SHA1AddLength(context, length) \
  (addTemp1 = (context)->Length_Low, (context)->Corrupted = (((context)->Length_Low += (length)) < addTemp1) && (++(context)->Length_High == 0) ? 1 : 0)

/* Local Function Prototypes */
static void SHA1Finalize(SHA1Context *context, uint8_t Pad_Byte);
static void SHA1PadMessage(SHA1Context *, uint8_t Pad_Byte);
static void SHA1ProcessMessageBlock(SHA1Context *);

/*
 *  SHA1Reset
 *
 *  Description:
 *      This function will initialize the SHA1Context in preparation
 *      for computing a new SHA1 message digest.
 *
 *  Parameters:
 *      context: [in/out]
 *          The context to reset.
 *
 *  Returns:
 *      sha Error Code.
 *
 */
inline int SHA1Reset(SHA1Context *context) {
  if (!context) return shaNull;

  context->Length_Low = 0;
  context->Length_High = 0;
  context->Message_Block_Index = 0;

  /* Initial Hash Values: FIPS-180-2 section 5.3.1 */
  context->Intermediate_Hash[0] = 0x67452301;
  context->Intermediate_Hash[1] = 0xEFCDAB89;
  context->Intermediate_Hash[2] = 0x98BADCFE;
  context->Intermediate_Hash[3] = 0x10325476;
  context->Intermediate_Hash[4] = 0xC3D2E1F0;

  context->Computed = 0;
  context->Corrupted = 0;

  return shaSuccess;
}

/*
 *  SHA1Input
 *
 *  Description:
 *      This function accepts an array of octets as the next portion
 *      of the message.
 *
 *  Parameters:
 *      context: [in/out]
 *          The SHA context to update
 *      message_array: [in]
 *          An array of characters representing the next portion of
 *          the message.
 *      length: [in]
 *          The length of the message in message_array
 *
 *  Returns:
 *      sha Error Code.
 *
 */
inline int SHA1Input(SHA1Context *context, const uint8_t *message_array, unsigned length) {
  if (!length) return shaSuccess;

  if (!context || !message_array) return shaNull;

  if (context->Computed) {
    context->Corrupted = shaStateError;
    return shaStateError;
  }

  if (context->Corrupted) return context->Corrupted;

  while (length-- && !context->Corrupted) {
    context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);

    if (!SHA1AddLength(context, 8) && (context->Message_Block_Index == SHA1_Message_Block_Size)) SHA1ProcessMessageBlock(context);

    message_array++;
  }

  return shaSuccess;
}

/*
 * SHA1FinalBits
 *
 * Description:
 *   This function will add in any final bits of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_bits: [in]
 *     The final bits of the message, in the upper portion of the
 *     byte. (Use 0b###00000 instead of 0b00000### to input the
 *     three bits ###.)
 *   length: [in]
 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 */
inline int SHA1FinalBits(SHA1Context *context, const uint8_t message_bits, unsigned int length) {
  uint8_t masks[8] = {/* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
                      /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
                      /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
                      /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE};
  uint8_t markbit[8] = {/* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
                        /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
                        /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
                        /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01};

  if (!length) return shaSuccess;

  if (!context) return shaNull;

  if (context->Computed || (length >= 8) || (length == 0)) {
    context->Corrupted = shaStateError;
    return shaStateError;
  }

  if (context->Corrupted) return context->Corrupted;

  SHA1AddLength(context, length);
  SHA1Finalize(context, (uint8_t)((message_bits & masks[length]) | markbit[length]));

  return shaSuccess;
}

/*
 * SHA1Result
 *
 * Description:
 *   This function will return the 160-bit message digest into the
 *   Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 19th element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA-1 hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA1Result(SHA1Context *context, uint8_t Message_Digest[SHA1HashSize]) {
  int i;

  if (!context || !Message_Digest) return shaNull;

  if (context->Corrupted) return context->Corrupted;

  if (!context->Computed) SHA1Finalize(context, 0x80);

  for (i = 0; i < SHA1HashSize; ++i) Message_Digest[i] = (uint8_t)(context->Intermediate_Hash[i >> 2] >> 8 * (3 - (i & 0x03)));

  return shaSuccess;
}

/*
 * SHA1Finalize
 *
 * Description:
 *   This helper function finishes off the digest calculations.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   Pad_Byte: [in]
 *     The last byte to add to the digest before the 0-padding
 *     and length. This will contain the last bits of the message
 *     followed by another single bit. If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   sha Error Code.
 *
 */
static void SHA1Finalize(SHA1Context *context, uint8_t Pad_Byte) {
  int i;
  SHA1PadMessage(context, Pad_Byte);
  /* message may be sensitive, clear it out */
  for (i = 0; i < SHA1_Message_Block_Size; ++i) context->Message_Block[i] = 0;
  context->Length_Low = 0; /* and clear length */
  context->Length_High = 0;
  context->Computed = 1;
}

/*
 * SHA1PadMessage
 *
 * Description:
 *   According to the standard, the message must be padded to an
 *   even 512 bits. The first padding bit must be a '1'. The last
 *   64 bits represent the length of the original message. All bits
 *   in between should be 0. This helper function will pad the
 *   message according to those rules by filling the Message_Block
 *   array accordingly. When it returns, it can be assumed that the
 *   message digest has been computed.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to pad
 *   Pad_Byte: [in]
 *     The last byte to add to the digest before the 0-padding
 *     and length. This will contain the last bits of the message
 *     followed by another single bit. If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   Nothing.
 */
static void SHA1PadMessage(SHA1Context *context, uint8_t Pad_Byte) {
  /*
   * Check to see if the current message block is too small to hold
   * the initial padding bits and length. If so, we will pad the
   * block, process it, and then continue padding into a second
   * block.
   */
  if (context->Message_Block_Index >= (SHA1_Message_Block_Size - 8)) {
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
    while (context->Message_Block_Index < SHA1_Message_Block_Size) context->Message_Block[context->Message_Block_Index++] = 0;

    SHA1ProcessMessageBlock(context);
  } else
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;

  while (context->Message_Block_Index < (SHA1_Message_Block_Size - 8)) context->Message_Block[context->Message_Block_Index++] = 0;

  /*
   * Store the message length as the last 8 octets
   */
  context->Message_Block[56] = (uint8_t)(context->Length_High >> 24);
  context->Message_Block[57] = (uint8_t)(context->Length_High >> 16);
  context->Message_Block[58] = (uint8_t)(context->Length_High >> 8);
  context->Message_Block[59] = (uint8_t)(context->Length_High);
  context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24);
  context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16);
  context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8);
  context->Message_Block[63] = (uint8_t)(context->Length_Low);

  SHA1ProcessMessageBlock(context);
}

/*
 * SHA1ProcessMessageBlock
 *
 * Description:
 *   This helper function will process the next 512 bits of the
 *   message stored in the Message_Block array.
 *
 * Parameters:
 *   None.
 *
 * Returns:
 *   Nothing.
 *
 * Comments:
 *   Many of the variable names in this code, especially the
 *   single character names, were used because those were the
 *   names used in the publication.
 */
static void SHA1ProcessMessageBlock(SHA1Context *context) {
  /* Constants defined in FIPS-180-2, section 4.2.1 */
  const uint32_t K[4] = {0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6};
  int t;                  /* Loop counter */
  uint32_t temp;          /* Temporary word value */
  uint32_t W[80];         /* Word sequence */
  uint32_t A, B, C, D, E; /* Word buffers */

  /*
   * Initialize the first 16 words in the array W
   */
  for (t = 0; t < 16; t++) {
    W[t] = ((uint32_t)context->Message_Block[t * 4]) << 24;
    W[t] |= ((uint32_t)context->Message_Block[t * 4 + 1]) << 16;
    W[t] |= ((uint32_t)context->Message_Block[t * 4 + 2]) << 8;
    W[t] |= ((uint32_t)context->Message_Block[t * 4 + 3]);
  }
  for (t = 16; t < 80; t++) W[t] = SHA1_ROTL(1, W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16]);

  A = context->Intermediate_Hash[0];
  B = context->Intermediate_Hash[1];
  C = context->Intermediate_Hash[2];
  D = context->Intermediate_Hash[3];
  E = context->Intermediate_Hash[4];

  for (t = 0; t < 20; t++) {
    temp = SHA1_ROTL(5, A) + SHA_Ch(B, C, D) + E + W[t] + K[0];
    E = D;
    D = C;
    C = SHA1_ROTL(30, B);
    B = A;
    A = temp;
  }

  for (t = 20; t < 40; t++) {
    temp = SHA1_ROTL(5, A) + SHA_Parity(B, C, D) + E + W[t] + K[1];
    E = D;
    D = C;
    C = SHA1_ROTL(30, B);
    B = A;
    A = temp;
  }

  for (t = 40; t < 60; t++) {
    temp = SHA1_ROTL(5, A) + SHA_Maj(B, C, D) + E + W[t] + K[2];
    E = D;
    D = C;
    C = SHA1_ROTL(30, B);
    B = A;
    A = temp;
  }

  for (t = 60; t < 80; t++) {
    temp = SHA1_ROTL(5, A) + SHA_Parity(B, C, D) + E + W[t] + K[3];
    E = D;
    D = C;
    C = SHA1_ROTL(30, B);
    B = A;
    A = temp;
  }

  context->Intermediate_Hash[0] += A;
  context->Intermediate_Hash[1] += B;
  context->Intermediate_Hash[2] += C;
  context->Intermediate_Hash[3] += D;
  context->Intermediate_Hash[4] += E;

  context->Message_Block_Index = 0;
}
/*************************** sha224-256.c ***************************/
/********************* See RFC 4634 for details *********************/
/*
 * Description:
 *   This file implements the Secure Hash Signature Standard
 *   algorithms as defined in the National Institute of Standards
 *   and Technology Federal Information Processing Standards
 *   Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
 *   published on August 1, 2002, and the FIPS PUB 180-2 Change
 *   Notice published on February 28, 2004.
 *
 *   A combined document showing all algorithms is available at
 *       http://csrc.nist.gov/publications/fips/
 *       fips180-2/fips180-2withchangenotice.pdf
 *
 *   The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit
 *   message digests for a given data stream. It should take about
 *   2**n steps to find a message with the same digest as a given
 *   message and 2**(n/2) to find any two messages with the same
 *   digest, when n is the digest size in bits. Therefore, this
 *   algorithm can serve as a means of providing a
 *   "fingerprint" for a message.
 *
 * Portability Issues:
 *   SHA-224 and SHA-256 are defined in terms of 32-bit "words".
 *   This code uses <stdint.h> (included via "sha.h") to define 32
 *   and 8 bit unsigned integer types. If your C compiler does not
 *   support 32 bit unsigned integers, this code is not
 *   appropriate.
 *
 * Caveats:
 *   SHA-224 and SHA-256 are designed to work with messages less
 *   than 2^64 bits long. This implementation uses SHA224/256Input()
 *   to hash the bits that are a multiple of the size of an 8-bit
 *   character, and then uses SHA224/256FinalBits() to hash the
 *   final few bits of the input.
 */

//#include "sha.h"
//#include "sha-private.h"
/* Define the SHA shift, rotate left and rotate right macro */
#define SHA256_SHR(bits, word) ((word) >> (bits))
#define SHA256_ROTL(bits, word) (((word) << (bits)) | ((word) >> (32 - (bits))))
#define SHA256_ROTR(bits, word) (((word) >> (bits)) | ((word) << (32 - (bits))))

/* Define the SHA SIGMA and sigma macros */
#define SHA256_SIGMA0(word) (SHA256_ROTR(2, word) ^ SHA256_ROTR(13, word) ^ SHA256_ROTR(22, word))
#define SHA256_SIGMA1(word) (SHA256_ROTR(6, word) ^ SHA256_ROTR(11, word) ^ SHA256_ROTR(25, word))
#define SHA256_sigma0(word) (SHA256_ROTR(7, word) ^ SHA256_ROTR(18, word) ^ SHA256_SHR(3, word))
#define SHA256_sigma1(word) (SHA256_ROTR(17, word) ^ SHA256_ROTR(19, word) ^ SHA256_SHR(10, word))

/*
 * add "length" to the length
 */
static uint32_t addTemp2;
#define SHA224_256AddLength(context, length) \
  (addTemp2 = (context)->Length_Low, (context)->Corrupted = (((context)->Length_Low += (length)) < addTemp2) && (++(context)->Length_High == 0) ? 1 : 0)

/* Local Function Prototypes */
static void SHA224_256Finalize(SHA256Context *context, uint8_t Pad_Byte);
static void SHA224_256PadMessage(SHA256Context *context, uint8_t Pad_Byte);
static void SHA224_256ProcessMessageBlock(SHA256Context *context);
static int SHA224_256Reset(SHA256Context *context, uint32_t *H0);
static int SHA224_256ResultN(SHA256Context *context, uint8_t Message_Digest[], int HashSize);

/* Initial Hash Values: FIPS-180-2 Change Notice 1 */
static uint32_t SHA224_H0[SHA256HashSize / 4] = {0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939, 0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4};

/* Initial Hash Values: FIPS-180-2 section 5.3.2 */
static uint32_t SHA256_H0[SHA256HashSize / 4] = {0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19};

/*
 * SHA224Reset
 *
 * Description:
 *   This function will initialize the SHA384Context in preparation
 *   for computing a new SHA224 message digest.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to reset.
 *
 * Returns:
 *   sha Error Code.
 */
inline int SHA224Reset(SHA224Context *context) { return SHA224_256Reset(context, SHA224_H0); }

/*
 * SHA224Input
 *
 * Description:
 *   This function accepts an array of octets as the next portion
 *   of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_array: [in]
 *     An array of characters representing the next portion of
 *     the message.
 *   length: [in]
 *     The length of the message in message_array
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA224Input(SHA224Context *context, const uint8_t *message_array, unsigned int length) { return SHA256Input(context, message_array, length); }

/*
 * SHA224FinalBits
 *
 * Description:
 *   This function will add in any final bits of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_bits: [in]
 *     The final bits of the message, in the upper portion of the
 *     byte. (Use 0b###00000 instead of 0b00000### to input the
 *     three bits ###.)
 *   length: [in]
 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 */
inline int SHA224FinalBits(SHA224Context *context, const uint8_t message_bits, unsigned int length) { return SHA256FinalBits(context, message_bits, length); }

/*
 * SHA224Result
 *
 * Description:
 *   This function will return the 224-bit message
 *   digest into the Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 28th element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *
 * Returns:
 *   sha Error Code.
 */
inline int SHA224Result(SHA224Context *context, uint8_t Message_Digest[SHA224HashSize]) { return SHA224_256ResultN(context, Message_Digest, SHA224HashSize); }

/*
 * SHA256Reset
 *
 * Description:
 *   This function will initialize the SHA256Context in preparation
 *   for computing a new SHA256 message digest.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to reset.
 *
 * Returns:
 *   sha Error Code.
 */
inline int SHA256Reset(SHA256Context *context) { return SHA224_256Reset(context, SHA256_H0); }

/*
 * SHA256Input
 *
 * Description:
 *   This function accepts an array of octets as the next portion
 *   of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_array: [in]
 *     An array of characters representing the next portion of
 *     the message.
 *   length: [in]
 *     The length of the message in message_array
 *
 * Returns:
 *   sha Error Code.
 */
inline int SHA256Input(SHA256Context *context, const uint8_t *message_array, unsigned int length) {
  if (!length) return shaSuccess;

  if (!context || !message_array) return shaNull;

  if (context->Computed) {
    context->Corrupted = shaStateError;
    return shaStateError;
  }

  if (context->Corrupted) return context->Corrupted;

  while (length-- && !context->Corrupted) {
    context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);

    if (!SHA224_256AddLength(context, 8) && (context->Message_Block_Index == SHA256_Message_Block_Size)) SHA224_256ProcessMessageBlock(context);

    message_array++;
  }

  return shaSuccess;
}

/*
 * SHA256FinalBits
 *
 * Description:
 *   This function will add in any final bits of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_bits: [in]
 *     The final bits of the message, in the upper portion of the
 *     byte. (Use 0b###00000 instead of 0b00000### to input the
 *     three bits ###.)
 *   length: [in]
 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 */
inline int SHA256FinalBits(SHA256Context *context, const uint8_t message_bits, unsigned int length) {
  uint8_t masks[8] = {/* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
                      /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
                      /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
                      /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE};
  uint8_t markbit[8] = {/* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
                        /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
                        /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
                        /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01};

  if (!length) return shaSuccess;

  if (!context) return shaNull;

  if ((context->Computed) || (length >= 8) || (length == 0)) {
    context->Corrupted = shaStateError;
    return shaStateError;
  }

  if (context->Corrupted) return context->Corrupted;

  SHA224_256AddLength(context, length);
  SHA224_256Finalize(context, (uint8_t)((message_bits & masks[length]) | markbit[length]));

  return shaSuccess;
}

/*
 * SHA256Result
 *
 * Description:
 *   This function will return the 256-bit message
 *   digest into the Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 32nd element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *
 * Returns:
 *   sha Error Code.
 */
inline int SHA256Result(SHA256Context *context, uint8_t Message_Digest[]) { return SHA224_256ResultN(context, Message_Digest, SHA256HashSize); }

/*
 * SHA224_256Finalize
 *
 * Description:
 *   This helper function finishes off the digest calculations.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   Pad_Byte: [in]
 *     The last byte to add to the digest before the 0-padding
 *     and length. This will contain the last bits of the message
 *     followed by another single bit. If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   sha Error Code.
 */
static void SHA224_256Finalize(SHA256Context *context, uint8_t Pad_Byte) {
  int i;
  SHA224_256PadMessage(context, Pad_Byte);
  /* message may be sensitive, so clear it out */
  for (i = 0; i < SHA256_Message_Block_Size; ++i) context->Message_Block[i] = 0;
  context->Length_Low = 0; /* and clear length */
  context->Length_High = 0;
  context->Computed = 1;
}

/*
 * SHA224_256PadMessage
 *
 * Description:
 *   According to the standard, the message must be padded to an
 *   even 512 bits. The first padding bit must be a '1'. The
 *   last 64 bits represent the length of the original message.
 *   All bits in between should be 0. This helper function will pad
 *   the message according to those rules by filling the
 *   Message_Block array accordingly. When it returns, it can be
 *   assumed that the message digest has been computed.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to pad
 *   Pad_Byte: [in]
 *     The last byte to add to the digest before the 0-padding
 *     and length. This will contain the last bits of the message
 *     followed by another single bit. If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   Nothing.
 */
static void SHA224_256PadMessage(SHA256Context *context, uint8_t Pad_Byte) {
  /*
   * Check to see if the current message block is too small to hold
   * the initial padding bits and length. If so, we will pad the
   * block, process it, and then continue padding into a second
   * block.
   */
  if (context->Message_Block_Index >= (SHA256_Message_Block_Size - 8)) {
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
    while (context->Message_Block_Index < SHA256_Message_Block_Size) context->Message_Block[context->Message_Block_Index++] = 0;
    SHA224_256ProcessMessageBlock(context);
  } else
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;

  while (context->Message_Block_Index < (SHA256_Message_Block_Size - 8)) context->Message_Block[context->Message_Block_Index++] = 0;

  /*
   * Store the message length as the last 8 octets
   */
  context->Message_Block[56] = (uint8_t)(context->Length_High >> 24);
  context->Message_Block[57] = (uint8_t)(context->Length_High >> 16);
  context->Message_Block[58] = (uint8_t)(context->Length_High >> 8);
  context->Message_Block[59] = (uint8_t)(context->Length_High);
  context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24);
  context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16);
  context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8);
  context->Message_Block[63] = (uint8_t)(context->Length_Low);

  SHA224_256ProcessMessageBlock(context);
}

/*
 * SHA224_256ProcessMessageBlock
 *
 * Description:
 *   This function will process the next 512 bits of the message
 *   stored in the Message_Block array.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *
 * Returns:
 *   Nothing.
 *
 * Comments:
 *   Many of the variable names in this code, especially the
 *   single character names, were used because those were the
 *   names used in the publication.
 */
static void SHA224_256ProcessMessageBlock(SHA256Context *context) {
  /* Constants defined in FIPS-180-2, section 4.2.2 */
  static const uint32_t K[64] = {0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
                                 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
                                 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
                                 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
                                 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
                                 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
                                 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
  int t, t4;                       /* Loop counter */
  uint32_t temp1, temp2;           /* Temporary word value */
  uint32_t W[64];                  /* Word sequence */
  uint32_t A, B, C, D, E, F, G, H; /* Word buffers */

  /*
   * Initialize the first 16 words in the array W
   */
  for (t = t4 = 0; t < 16; t++, t4 += 4)
    W[t] = (((uint32_t)context->Message_Block[t4]) << 24) | (((uint32_t)context->Message_Block[t4 + 1]) << 16) |
           (((uint32_t)context->Message_Block[t4 + 2]) << 8) | (((uint32_t)context->Message_Block[t4 + 3]));

  for (t = 16; t < 64; t++) W[t] = SHA256_sigma1(W[t - 2]) + W[t - 7] + SHA256_sigma0(W[t - 15]) + W[t - 16];

  A = context->Intermediate_Hash[0];
  B = context->Intermediate_Hash[1];
  C = context->Intermediate_Hash[2];
  D = context->Intermediate_Hash[3];
  E = context->Intermediate_Hash[4];
  F = context->Intermediate_Hash[5];
  G = context->Intermediate_Hash[6];
  H = context->Intermediate_Hash[7];

  for (t = 0; t < 64; t++) {
    temp1 = H + SHA256_SIGMA1(E) + SHA_Ch(E, F, G) + K[t] + W[t];
    temp2 = SHA256_SIGMA0(A) + SHA_Maj(A, B, C);
    H = G;
    G = F;
    F = E;
    E = D + temp1;
    D = C;
    C = B;
    B = A;
    A = temp1 + temp2;
  }

  context->Intermediate_Hash[0] += A;
  context->Intermediate_Hash[1] += B;
  context->Intermediate_Hash[2] += C;
  context->Intermediate_Hash[3] += D;
  context->Intermediate_Hash[4] += E;
  context->Intermediate_Hash[5] += F;
  context->Intermediate_Hash[6] += G;
  context->Intermediate_Hash[7] += H;

  context->Message_Block_Index = 0;
}

/*
 * SHA224_256Reset
 *
 * Description:
 *   This helper function will initialize the SHA256Context in
 *   preparation for computing a new SHA256 message digest.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to reset.
 *   H0
 *     The initial hash value to use.
 *
 * Returns:
 *   sha Error Code.
 */
static int SHA224_256Reset(SHA256Context *context, uint32_t *H0) {
  if (!context) return shaNull;

  context->Length_Low = 0;
  context->Length_High = 0;
  context->Message_Block_Index = 0;

  context->Intermediate_Hash[0] = H0[0];
  context->Intermediate_Hash[1] = H0[1];
  context->Intermediate_Hash[2] = H0[2];
  context->Intermediate_Hash[3] = H0[3];
  context->Intermediate_Hash[4] = H0[4];
  context->Intermediate_Hash[5] = H0[5];
  context->Intermediate_Hash[6] = H0[6];
  context->Intermediate_Hash[7] = H0[7];

  context->Computed = 0;
  context->Corrupted = 0;

  return shaSuccess;
}

/*
 * SHA224_256ResultN
 *
 * Description:
 *   This helper function will return the 224-bit or 256-bit message
 *   digest into the Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 28th/32nd element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *   HashSize: [in]
 *     The size of the hash, either 28 or 32.
 *
 * Returns:
 *   sha Error Code.
 */
static int SHA224_256ResultN(SHA256Context *context, uint8_t Message_Digest[], int HashSize) {
  int i;

  if (!context || !Message_Digest) return shaNull;

  if (context->Corrupted) return context->Corrupted;

  if (!context->Computed) SHA224_256Finalize(context, 0x80);

  for (i = 0; i < HashSize; ++i) Message_Digest[i] = (uint8_t)(context->Intermediate_Hash[i >> 2] >> 8 * (3 - (i & 0x03)));

  return shaSuccess;
}
/*************************** sha384-512.c ***************************/
/********************* See RFC 4634 for details *********************/
/*
 * Description:
 *   This file implements the Secure Hash Signature Standard
 *   algorithms as defined in the National Institute of Standards
 *   and Technology Federal Information Processing Standards
 *   Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
 *   published on August 1, 2002, and the FIPS PUB 180-2 Change
 *   Notice published on February 28, 2004.
 *
 *   A combined document showing all algorithms is available at
 *       http://csrc.nist.gov/publications/fips/
 *       fips180-2/fips180-2withchangenotice.pdf
 *
 *   The SHA-384 and SHA-512 algorithms produce 384-bit and 512-bit
 *   message digests for a given data stream. It should take about
 *   2**n steps to find a message with the same digest as a given
 *   message and 2**(n/2) to find any two messages with the same
 *   digest, when n is the digest size in bits. Therefore, this
 *   algorithm can serve as a means of providing a
 *   "fingerprint" for a message.
 *
 * Portability Issues:
 *   SHA-384 and SHA-512 are defined in terms of 64-bit "words",
 *   but if USE_32BIT_ONLY is #defined, this code is implemented in
 *   terms of 32-bit "words". This code uses <stdint.h> (included
 *   via "sha.h") to define the 64, 32 and 8 bit unsigned integer
 *   types. If your C compiler does not support 64 bit unsigned
 *   integers, and you do not #define USE_32BIT_ONLY, this code is
 *   not appropriate.
 *
 * Caveats:
 *   SHA-384 and SHA-512 are designed to work with messages less
 *   than 2^128 bits long. This implementation uses
 *   SHA384/512Input() to hash the bits that are a multiple of the
 *   size of an 8-bit character, and then uses SHA384/256FinalBits()
 *   to hash the final few bits of the input.
 *
 */

//#include "sha.h"
//#include "sha-private.h"

#ifdef USE_32BIT_ONLY
/*
 * Define 64-bit arithmetic in terms of 32-bit arithmetic.
 * Each 64-bit number is represented in a 2-word array.
 * All macros are defined such that the result is the last parameter.
 */

/*
 * Define shift, rotate left and rotate right functions
 */
#define SHA512_SHR(bits, word, ret)                                         \
  (/* (((uint64_t)((word))) >> (bits)) */                                   \
   (ret)[0] = (((bits) < 32) && ((bits) >= 0)) ? ((word)[0] >> (bits)) : 0, \
   (ret)[1] =                                                               \
       ((bits) > 32) ? ((word)[0] >> ((bits)-32)) : ((bits) == 32) ? (word)[0] : ((bits) >= 0) ? (((word)[0] << (32 - (bits))) | ((word)[1] >> (bits))) : 0)

#define SHA512_SHL(bits, word, ret)                                                                                                                          \
  (/* (((uint64_t)(word)) << (bits)) */                                                                                                                      \
   (ret)[0] =                                                                                                                                                \
       ((bits) > 32) ? ((word)[1] << ((bits)-32)) : ((bits) == 32) ? (word)[1] : ((bits) >= 0) ? (((word)[0] << (bits)) | ((word)[1] >> (32 - (bits)))) : 0, \
   (ret)[1] = (((bits) < 32) && ((bits) >= 0)) ? ((word)[1] << (bits)) : 0)

/*
 * Define 64-bit OR
 */
#define SHA512_OR(word1, word2, ret) ((ret)[0] = (word1)[0] | (word2)[0], (ret)[1] = (word1)[1] | (word2)[1])

/*
 * Define 64-bit XOR
 */
#define SHA512_XOR(word1, word2, ret) ((ret)[0] = (word1)[0] ^ (word2)[0], (ret)[1] = (word1)[1] ^ (word2)[1])

/*
 * Define 64-bit AND
 */
#define SHA512_AND(word1, word2, ret) ((ret)[0] = (word1)[0] & (word2)[0], (ret)[1] = (word1)[1] & (word2)[1])

/*
 * Define 64-bit TILDA
 */
#define SHA512_TILDA(word, ret) ((ret)[0] = ~(word)[0], (ret)[1] = ~(word)[1])

/*
 * Define 64-bit ADD
 */
#define SHA512_ADD(word1, word2, ret) ((ret)[1] = (word1)[1], (ret)[1] += (word2)[1], (ret)[0] = (word1)[0] + (word2)[0] + ((ret)[1] < (word1)[1]))

/*
 * Add the 4word value in word2 to word1.
 */
static uint32_t ADDTO4_temp, ADDTO4_temp2;
#define SHA512_ADDTO4(word1, word2)                                                                                                      \
  (ADDTO4_temp = (word1)[3], (word1)[3] += (word2)[3], ADDTO4_temp2 = (word1)[2], (word1)[2] += (word2)[2] + ((word1)[3] < ADDTO4_temp), \
   ADDTO4_temp = (word1)[1], (word1)[1] += (word2)[1] + ((word1)[2] < ADDTO4_temp2), (word1)[0] += (word2)[0] + ((word1)[1] < ADDTO4_temp))

/*
 * Add the 2word value in word2 to word1.
 */
static uint32_t ADDTO2_temp;
#define SHA512_ADDTO2(word1, word2) (ADDTO2_temp = (word1)[1], (word1)[1] += (word2)[1], (word1)[0] += (word2)[0] + ((word1)[1] < ADDTO2_temp))

/*
 * SHA rotate   ((word >> bits) | (word << (64-bits)))
 */
static uint32_t ROTR_temp1[2], ROTR_temp2[2];
#define SHA512_ROTR(bits, word, ret) \
  (SHA512_SHR((bits), (word), ROTR_temp1), SHA512_SHL(64 - (bits), (word), ROTR_temp2), SHA512_OR(ROTR_temp1, ROTR_temp2, (ret)))

/*
 * Define the SHA SIGMA and sigma macros
 *  SHA512_ROTR(28,word) ^ SHA512_ROTR(34,word) ^ SHA512_ROTR(39,word)
 */
static uint32_t SIGMA0_temp1[2], SIGMA0_temp2[2], SIGMA0_temp3[2], SIGMA0_temp4[2];
#define SHA512_SIGMA0(word, ret)                                                                                        \
  (SHA512_ROTR(28, (word), SIGMA0_temp1), SHA512_ROTR(34, (word), SIGMA0_temp2), SHA512_ROTR(39, (word), SIGMA0_temp3), \
   SHA512_XOR(SIGMA0_temp2, SIGMA0_temp3, SIGMA0_temp4), SHA512_XOR(SIGMA0_temp1, SIGMA0_temp4, (ret)))

/*
 * SHA512_ROTR(14,word) ^ SHA512_ROTR(18,word) ^ SHA512_ROTR(41,word)
 */
static uint32_t SIGMA1_temp1[2], SIGMA1_temp2[2], SIGMA1_temp3[2], SIGMA1_temp4[2];
#define SHA512_SIGMA1(word, ret)                                                                                        \
  (SHA512_ROTR(14, (word), SIGMA1_temp1), SHA512_ROTR(18, (word), SIGMA1_temp2), SHA512_ROTR(41, (word), SIGMA1_temp3), \
   SHA512_XOR(SIGMA1_temp2, SIGMA1_temp3, SIGMA1_temp4), SHA512_XOR(SIGMA1_temp1, SIGMA1_temp4, (ret)))

/*
 * (SHA512_ROTR( 1,word) ^ SHA512_ROTR( 8,word) ^ SHA512_SHR( 7,word))
 */
static uint32_t sigma0_temp1[2], sigma0_temp2[2], sigma0_temp3[2], sigma0_temp4[2];
#define SHA512_sigma0(word, ret)                                                                                    \
  (SHA512_ROTR(1, (word), sigma0_temp1), SHA512_ROTR(8, (word), sigma0_temp2), SHA512_SHR(7, (word), sigma0_temp3), \
   SHA512_XOR(sigma0_temp2, sigma0_temp3, sigma0_temp4), SHA512_XOR(sigma0_temp1, sigma0_temp4, (ret)))

/*
 * (SHA512_ROTR(19,word) ^ SHA512_ROTR(61,word) ^ SHA512_SHR( 6,word))
 */
static uint32_t sigma1_temp1[2], sigma1_temp2[2], sigma1_temp3[2], sigma1_temp4[2];
#define SHA512_sigma1(word, ret)                                                                                      \
  (SHA512_ROTR(19, (word), sigma1_temp1), SHA512_ROTR(61, (word), sigma1_temp2), SHA512_SHR(6, (word), sigma1_temp3), \
   SHA512_XOR(sigma1_temp2, sigma1_temp3, sigma1_temp4), SHA512_XOR(sigma1_temp1, sigma1_temp4, (ret)))

#undef SHA_Ch
#undef SHA_Maj

#ifndef USE_MODIFIED_MACROS
/*
 * These definitions are the ones used in FIPS-180-2, section 4.1.3
 *  Ch(x,y,z)   ((x & y) ^ (~x & z))
 */
static uint32_t Ch_temp1[2], Ch_temp2[2], Ch_temp3[2];
#define SHA_Ch(x, y, z, ret) (SHA512_AND(x, y, Ch_temp1), SHA512_TILDA(x, Ch_temp2), SHA512_AND(Ch_temp2, z, Ch_temp3), SHA512_XOR(Ch_temp1, Ch_temp3, (ret)))
/*
 *  Maj(x,y,z)  (((x)&(y)) ^ ((x)&(z)) ^ ((y)&(z)))
 */
static uint32_t Maj_temp1[2], Maj_temp2[2], Maj_temp3[2], Maj_temp4[2];
#define SHA_Maj(x, y, z, ret)                                                                                                          \
  (SHA512_AND(x, y, Maj_temp1), SHA512_AND(x, z, Maj_temp2), SHA512_AND(y, z, Maj_temp3), SHA512_XOR(Maj_temp2, Maj_temp3, Maj_temp4), \
   SHA512_XOR(Maj_temp1, Maj_temp4, (ret)))

#else /* !USE_32BIT_ONLY */
                                                  /*
                                                   * These definitions are potentially faster equivalents for the ones
                                                   * used in FIPS-180-2, section 4.1.3.
                                                   *   ((x & y) ^ (~x & z)) becomes
                                                   *   ((x & (y ^ z)) ^ z)
                                                   */
#define SHA_Ch(x, y, z, ret) ((ret)[0] = (((x)[0] & ((y)[0] ^ (z)[0])) ^ (z)[0]), (ret)[1] = (((x)[1] & ((y)[1] ^ (z)[1])) ^ (z)[1]))

/*
 *   ((x & y) ^ (x & z) ^ (y & z)) becomes
 *   ((x & (y | z)) | (y & z))
 */
#define SHA_Maj(x, y, z, ret) (ret[0] = (((x)[0] & ((y)[0] | (z)[0])) | ((y)[0] & (z)[0])), ret[1] = (((x)[1] & ((y)[1] | (z)[1])) | ((y)[1] & (z)[1])))
#endif /* USE_MODIFIED_MACROS */

/*
 * add "length" to the length
 */
static uint32_t addTemp3[4] = {0, 0, 0, 0};

#define SHA384_512AddLength(context, length)                           \
  (addTemp3[3] = (length), SHA512_ADDTO4((context)->Length, addTemp3), \
   (context)->Corrupted = (((context)->Length[3] == 0) && ((context)->Length[2] == 0) && ((context)->Length[1] == 0) && ((context)->Length[0] < 8)) ? 1 : 0)

/* Local Function Prototypes */
static void SHA384_512Finalize(SHA512Context *context, uint8_t Pad_Byte);
static void SHA384_512PadMessage(SHA512Context *context, uint8_t Pad_Byte);
static void SHA384_512ProcessMessageBlock(SHA512Context *context);
static int SHA384_512Reset(SHA512Context *context, uint32_t H0[]);
static int SHA384_512ResultN(SHA512Context *context, uint8_t Message_Digest[], int HashSize);

/* Initial Hash Values: FIPS-180-2 sections 5.3.3 and 5.3.4 */
static uint32_t SHA384_H0[SHA512HashSize / 4] = {0xCBBB9D5D, 0xC1059ED8, 0x629A292A, 0x367CD507, 0x9159015A, 0x3070DD17, 0x152FECD8, 0xF70E5939,
                                                 0x67332667, 0xFFC00B31, 0x8EB44A87, 0x68581511, 0xDB0C2E0D, 0x64F98FA7, 0x47B5481D, 0xBEFA4FA4};

static uint32_t SHA512_H0[SHA512HashSize / 4] = {0x6A09E667, 0xF3BCC908, 0xBB67AE85, 0x84CAA73B, 0x3C6EF372, 0xFE94F82B, 0xA54FF53A, 0x5F1D36F1,
                                                 0x510E527F, 0xADE682D1, 0x9B05688C, 0x2B3E6C1F, 0x1F83D9AB, 0xFB41BD6B, 0x5BE0CD19, 0x137E2179};

#else /* !USE_32BIT_ONLY */

/* Define the SHA shift, rotate left and rotate right macro */
#define SHA512_SHR(bits, word) (((uint64_t)(word)) >> (bits))
#define SHA512_ROTR(bits, word) ((((uint64_t)(word)) >> (bits)) | (((uint64_t)(word)) << (64 - (bits))))

/* Define the SHA SIGMA and sigma macros */
#define SHA512_SIGMA0(word) (SHA512_ROTR(28, word) ^ SHA512_ROTR(34, word) ^ SHA512_ROTR(39, word))
#define SHA512_SIGMA1(word) (SHA512_ROTR(14, word) ^ SHA512_ROTR(18, word) ^ SHA512_ROTR(41, word))
#define SHA512_sigma0(word) (SHA512_ROTR(1, word) ^ SHA512_ROTR(8, word) ^ SHA512_SHR(7, word))
#define SHA512_sigma1(word) (SHA512_ROTR(19, word) ^ SHA512_ROTR(61, word) ^ SHA512_SHR(6, word))

/*
 * add "length" to the length
 */
static uint64_t addTemp4;
#define SHA384_512AddLength(context, length) \
  (addTemp4 = context->Length_Low, context->Corrupted = ((context->Length_Low += length) < addTemp4) && (++context->Length_High == 0) ? 1 : 0)

/* Local Function Prototypes */
static void SHA384_512Finalize(SHA512Context *context, uint8_t Pad_Byte);
static void SHA384_512PadMessage(SHA512Context *context, uint8_t Pad_Byte);
static void SHA384_512ProcessMessageBlock(SHA512Context *context);
static int SHA384_512Reset(SHA512Context *context, uint64_t H0[]);
static int SHA384_512ResultN(SHA512Context *context, uint8_t Message_Digest[], int HashSize);

/* Initial Hash Values: FIPS-180-2 sections 5.3.3 and 5.3.4 */
static uint64_t SHA384_H0[] = {0xCBBB9D5DC1059ED8ll, 0x629A292A367CD507ll, 0x9159015A3070DD17ll, 0x152FECD8F70E5939ll,
                               0x67332667FFC00B31ll, 0x8EB44A8768581511ll, 0xDB0C2E0D64F98FA7ll, 0x47B5481DBEFA4FA4ll};

static uint64_t SHA512_H0[] = {0x6A09E667F3BCC908ll, 0xBB67AE8584CAA73Bll, 0x3C6EF372FE94F82Bll, 0xA54FF53A5F1D36F1ll,
                               0x510E527FADE682D1ll, 0x9B05688C2B3E6C1Fll, 0x1F83D9ABFB41BD6Bll, 0x5BE0CD19137E2179ll};

#endif /* USE_32BIT_ONLY */

/*
 * SHA384Reset
 *
 * Description:
 *   This function will initialize the SHA384Context in preparation
 *   for computing a new SHA384 message digest.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to reset.
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA384Reset(SHA384Context *context) { return SHA384_512Reset(context, SHA384_H0); }

/*
 * SHA384Input
 *
 * Description:
 *   This function accepts an array of octets as the next portion
 *   of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_array: [in]
 *     An array of characters representing the next portion of
 *     the message.
 *   length: [in]
 *     The length of the message in message_array
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA384Input(SHA384Context *context, const uint8_t *message_array, unsigned int length) { return SHA512Input(context, message_array, length); }

/*
 * SHA384FinalBits
 *
 * Description:
 *   This function will add in any final bits of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_bits: [in]
 *     The final bits of the message, in the upper portion of the
 *     byte. (Use 0b###00000 instead of 0b00000### to input the
 *     three bits ###.)
 *   length: [in]
 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA384FinalBits(SHA384Context *context, const uint8_t message_bits, unsigned int length) { return SHA512FinalBits(context, message_bits, length); }

/*
 * SHA384Result
 *
 * Description:
 *   This function will return the 384-bit message
 *   digest into the Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 48th element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA384Result(SHA384Context *context, uint8_t Message_Digest[SHA384HashSize]) { return SHA384_512ResultN(context, Message_Digest, SHA384HashSize); }

/*
 * SHA512Reset
 *
 * Description:
 *   This function will initialize the SHA512Context in preparation
 *   for computing a new SHA512 message digest.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to reset.
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA512Reset(SHA512Context *context) { return SHA384_512Reset(context, SHA512_H0); }

/*
 * SHA512Input
 *
 * Description:
 *   This function accepts an array of octets as the next portion
 *   of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_array: [in]
 *     An array of characters representing the next portion of
 *     the message.
 *   length: [in]
 *     The length of the message in message_array
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA512Input(SHA512Context *context, const uint8_t *message_array, unsigned int length) {
  if (!length) return shaSuccess;

  if (!context || !message_array) return shaNull;

  if (context->Computed) {
    context->Corrupted = shaStateError;
    return shaStateError;
  }

  if (context->Corrupted) return context->Corrupted;

  while (length-- && !context->Corrupted) {
    context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);

    if (!SHA384_512AddLength(context, 8) && (context->Message_Block_Index == SHA512_Message_Block_Size)) SHA384_512ProcessMessageBlock(context);

    message_array++;
  }

  return shaSuccess;
}

/*
 * SHA512FinalBits
 *
 * Description:
 *   This function will add in any final bits of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_bits: [in]
 *     The final bits of the message, in the upper portion of the
 *     byte. (Use 0b###00000 instead of 0b00000### to input the
 *     three bits ###.)
 *   length: [in]
 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA512FinalBits(SHA512Context *context, const uint8_t message_bits, unsigned int length) {
  uint8_t masks[8] = {/* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
                      /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
                      /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
                      /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE};
  uint8_t markbit[8] = {/* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
                        /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
                        /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
                        /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01};

  if (!length) return shaSuccess;

  if (!context) return shaNull;

  if ((context->Computed) || (length >= 8) || (length == 0)) {
    context->Corrupted = shaStateError;
    return shaStateError;
  }

  if (context->Corrupted) return context->Corrupted;

  SHA384_512AddLength(context, length);
  SHA384_512Finalize(context, (uint8_t)((message_bits & masks[length]) | markbit[length]));

  return shaSuccess;
}

/*
 * SHA384_512Finalize
 *
 * Description:
 *   This helper function finishes off the digest calculations.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   Pad_Byte: [in]
 *     The last byte to add to the digest before the 0-padding
 *     and length. This will contain the last bits of the message
 *     followed by another single bit. If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   sha Error Code.
 *
 */
static void SHA384_512Finalize(SHA512Context *context, uint8_t Pad_Byte) {
  int_least16_t i;
  SHA384_512PadMessage(context, Pad_Byte);
  /* message may be sensitive, clear it out */
  for (i = 0; i < SHA512_Message_Block_Size; ++i) context->Message_Block[i] = 0;
#ifdef USE_32BIT_ONLY /* and clear length */
  context->Length[0] = context->Length[1] = 0;
  context->Length[2] = context->Length[3] = 0;
#else  /* !USE_32BIT_ONLY */
  context->Length_Low = 0;
  context->Length_High = 0;
#endif /* USE_32BIT_ONLY */
  context->Computed = 1;
}

/*
 * SHA512Result
 *
 * Description:
 *   This function will return the 512-bit message
 *   digest into the Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 64th element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int SHA512Result(SHA512Context *context, uint8_t Message_Digest[SHA512HashSize]) { return SHA384_512ResultN(context, Message_Digest, SHA512HashSize); }

/*
 * SHA384_512PadMessage
 *
 * Description:
 *   According to the standard, the message must be padded to an
 *   even 1024 bits. The first padding bit must be a '1'. The
 *   last 128 bits represent the length of the original message.
 *   All bits in between should be 0. This helper function will
 *   pad the message according to those rules by filling the
 *   Message_Block array accordingly. When it returns, it can be
 *   assumed that the message digest has been computed.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to pad
 *   Pad_Byte: [in]
 *     The last byte to add to the digest before the 0-padding
 *     and length. This will contain the last bits of the message
 *     followed by another single bit. If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   Nothing.
 *
 */
static void SHA384_512PadMessage(SHA512Context *context, uint8_t Pad_Byte) {
  /*
   * Check to see if the current message block is too small to hold
   * the initial padding bits and length. If so, we will pad the
   * block, process it, and then continue padding into a second
   * block.
   */
  if (context->Message_Block_Index >= (SHA512_Message_Block_Size - 16)) {
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
    while (context->Message_Block_Index < SHA512_Message_Block_Size) context->Message_Block[context->Message_Block_Index++] = 0;

    SHA384_512ProcessMessageBlock(context);
  } else
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;

  while (context->Message_Block_Index < (SHA512_Message_Block_Size - 16)) context->Message_Block[context->Message_Block_Index++] = 0;

    /*
     * Store the message length as the last 16 octets
     */
#ifdef USE_32BIT_ONLY
  context->Message_Block[112] = (uint8_t)(context->Length[0] >> 24);
  context->Message_Block[113] = (uint8_t)(context->Length[0] >> 16);
  context->Message_Block[114] = (uint8_t)(context->Length[0] >> 8);
  context->Message_Block[115] = (uint8_t)(context->Length[0]);
  context->Message_Block[116] = (uint8_t)(context->Length[1] >> 24);
  context->Message_Block[117] = (uint8_t)(context->Length[1] >> 16);
  context->Message_Block[118] = (uint8_t)(context->Length[1] >> 8);
  context->Message_Block[119] = (uint8_t)(context->Length[1]);

  context->Message_Block[120] = (uint8_t)(context->Length[2] >> 24);
  context->Message_Block[121] = (uint8_t)(context->Length[2] >> 16);
  context->Message_Block[122] = (uint8_t)(context->Length[2] >> 8);
  context->Message_Block[123] = (uint8_t)(context->Length[2]);
  context->Message_Block[124] = (uint8_t)(context->Length[3] >> 24);
  context->Message_Block[125] = (uint8_t)(context->Length[3] >> 16);
  context->Message_Block[126] = (uint8_t)(context->Length[3] >> 8);
  context->Message_Block[127] = (uint8_t)(context->Length[3]);
#else  /* !USE_32BIT_ONLY */
  context->Message_Block[112] = (uint8_t)(context->Length_High >> 56);
  context->Message_Block[113] = (uint8_t)(context->Length_High >> 48);
  context->Message_Block[114] = (uint8_t)(context->Length_High >> 40);
  context->Message_Block[115] = (uint8_t)(context->Length_High >> 32);
  context->Message_Block[116] = (uint8_t)(context->Length_High >> 24);
  context->Message_Block[117] = (uint8_t)(context->Length_High >> 16);
  context->Message_Block[118] = (uint8_t)(context->Length_High >> 8);
  context->Message_Block[119] = (uint8_t)(context->Length_High);

  context->Message_Block[120] = (uint8_t)(context->Length_Low >> 56);
  context->Message_Block[121] = (uint8_t)(context->Length_Low >> 48);
  context->Message_Block[122] = (uint8_t)(context->Length_Low >> 40);
  context->Message_Block[123] = (uint8_t)(context->Length_Low >> 32);
  context->Message_Block[124] = (uint8_t)(context->Length_Low >> 24);
  context->Message_Block[125] = (uint8_t)(context->Length_Low >> 16);
  context->Message_Block[126] = (uint8_t)(context->Length_Low >> 8);
  context->Message_Block[127] = (uint8_t)(context->Length_Low);
#endif /* USE_32BIT_ONLY */

  SHA384_512ProcessMessageBlock(context);
}

/*
 * SHA384_512ProcessMessageBlock
 *
 * Description:
 *   This helper function will process the next 1024 bits of the
 *   message stored in the Message_Block array.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *
 * Returns:
 *   Nothing.
 *
 * Comments:
 *   Many of the variable names in this code, especially the
 *   single character names, were used because those were the
 *   names used in the publication.
 *
 *
 */
static void SHA384_512ProcessMessageBlock(SHA512Context *context) {
  /* Constants defined in FIPS-180-2, section 4.2.3 */
#ifdef USE_32BIT_ONLY
  static const uint32_t K[80 * 2] = {
      0x428A2F98, 0xD728AE22, 0x71374491, 0x23EF65CD, 0xB5C0FBCF, 0xEC4D3B2F, 0xE9B5DBA5, 0x8189DBBC, 0x3956C25B, 0xF348B538, 0x59F111F1, 0xB605D019,
      0x923F82A4, 0xAF194F9B, 0xAB1C5ED5, 0xDA6D8118, 0xD807AA98, 0xA3030242, 0x12835B01, 0x45706FBE, 0x243185BE, 0x4EE4B28C, 0x550C7DC3, 0xD5FFB4E2,
      0x72BE5D74, 0xF27B896F, 0x80DEB1FE, 0x3B1696B1, 0x9BDC06A7, 0x25C71235, 0xC19BF174, 0xCF692694, 0xE49B69C1, 0x9EF14AD2, 0xEFBE4786, 0x384F25E3,
      0x0FC19DC6, 0x8B8CD5B5, 0x240CA1CC, 0x77AC9C65, 0x2DE92C6F, 0x592B0275, 0x4A7484AA, 0x6EA6E483, 0x5CB0A9DC, 0xBD41FBD4, 0x76F988DA, 0x831153B5,
      0x983E5152, 0xEE66DFAB, 0xA831C66D, 0x2DB43210, 0xB00327C8, 0x98FB213F, 0xBF597FC7, 0xBEEF0EE4, 0xC6E00BF3, 0x3DA88FC2, 0xD5A79147, 0x930AA725,
      0x06CA6351, 0xE003826F, 0x14292967, 0x0A0E6E70, 0x27B70A85, 0x46D22FFC, 0x2E1B2138, 0x5C26C926, 0x4D2C6DFC, 0x5AC42AED, 0x53380D13, 0x9D95B3DF,
      0x650A7354, 0x8BAF63DE, 0x766A0ABB, 0x3C77B2A8, 0x81C2C92E, 0x47EDAEE6, 0x92722C85, 0x1482353B, 0xA2BFE8A1, 0x4CF10364, 0xA81A664B, 0xBC423001,
      0xC24B8B70, 0xD0F89791, 0xC76C51A3, 0x0654BE30, 0xD192E819, 0xD6EF5218, 0xD6990624, 0x5565A910, 0xF40E3585, 0x5771202A, 0x106AA070, 0x32BBD1B8,
      0x19A4C116, 0xB8D2D0C8, 0x1E376C08, 0x5141AB53, 0x2748774C, 0xDF8EEB99, 0x34B0BCB5, 0xE19B48A8, 0x391C0CB3, 0xC5C95A63, 0x4ED8AA4A, 0xE3418ACB,
      0x5B9CCA4F, 0x7763E373, 0x682E6FF3, 0xD6B2B8A3, 0x748F82EE, 0x5DEFB2FC, 0x78A5636F, 0x43172F60, 0x84C87814, 0xA1F0AB72, 0x8CC70208, 0x1A6439EC,
      0x90BEFFFA, 0x23631E28, 0xA4506CEB, 0xDE82BDE9, 0xBEF9A3F7, 0xB2C67915, 0xC67178F2, 0xE372532B, 0xCA273ECE, 0xEA26619C, 0xD186B8C7, 0x21C0C207,
      0xEADA7DD6, 0xCDE0EB1E, 0xF57D4F7F, 0xEE6ED178, 0x06F067AA, 0x72176FBA, 0x0A637DC5, 0xA2C898A6, 0x113F9804, 0xBEF90DAE, 0x1B710B35, 0x131C471B,
      0x28DB77F5, 0x23047D84, 0x32CAAB7B, 0x40C72493, 0x3C9EBE0A, 0x15C9BEBC, 0x431D67C4, 0x9C100D4C, 0x4CC5D4BE, 0xCB3E42B6, 0x597F299C, 0xFC657E2A,
      0x5FCB6FAB, 0x3AD6FAEC, 0x6C44198C, 0x4A475817};
  int t, t2, t8;               /* Loop counter */
  uint32_t temp1[2], temp2[2], /* Temporary word values */
      temp3[2], temp4[2], temp5[2];
  uint32_t W[2 * 80];              /* Word sequence */
  uint32_t A[2], B[2], C[2], D[2], /* Word buffers */
      E[2], F[2], G[2], H[2];

  /* Initialize the first 16 words in the array W */
  for (t = t2 = t8 = 0; t < 16; t++, t8 += 8) {
    W[t2++] = ((((uint32_t)context->Message_Block[t8])) << 24) | ((((uint32_t)context->Message_Block[t8 + 1])) << 16) |
              ((((uint32_t)context->Message_Block[t8 + 2])) << 8) | ((((uint32_t)context->Message_Block[t8 + 3])));
    W[t2++] = ((((uint32_t)context->Message_Block[t8 + 4])) << 24) | ((((uint32_t)context->Message_Block[t8 + 5])) << 16) |
              ((((uint32_t)context->Message_Block[t8 + 6])) << 8) | ((((uint32_t)context->Message_Block[t8 + 7])));
  }

  for (t = 16; t < 80; t++, t2 += 2) {
    /* W[t] = SHA512_sigma1(W[t-2]) + W[t-7] +
       SHA512_sigma0(W[t-15]) + W[t-16]; */
    uint32_t *Wt2 = &W[t2 - 2 * 2];
    uint32_t *Wt7 = &W[t2 - 7 * 2];
    uint32_t *Wt15 = &W[t2 - 15 * 2];
    uint32_t *Wt16 = &W[t2 - 16 * 2];
    SHA512_sigma1(Wt2, temp1);
    SHA512_ADD(temp1, Wt7, temp2);
    SHA512_sigma0(Wt15, temp1);
    SHA512_ADD(temp1, Wt16, temp3);
    SHA512_ADD(temp2, temp3, &W[t2]);
  }

  A[0] = context->Intermediate_Hash[0];
  A[1] = context->Intermediate_Hash[1];
  B[0] = context->Intermediate_Hash[2];
  B[1] = context->Intermediate_Hash[3];
  C[0] = context->Intermediate_Hash[4];
  C[1] = context->Intermediate_Hash[5];
  D[0] = context->Intermediate_Hash[6];
  D[1] = context->Intermediate_Hash[7];
  E[0] = context->Intermediate_Hash[8];
  E[1] = context->Intermediate_Hash[9];
  F[0] = context->Intermediate_Hash[10];
  F[1] = context->Intermediate_Hash[11];
  G[0] = context->Intermediate_Hash[12];
  G[1] = context->Intermediate_Hash[13];
  H[0] = context->Intermediate_Hash[14];
  H[1] = context->Intermediate_Hash[15];

  for (t = t2 = 0; t < 80; t++, t2 += 2) {
    /*
     * temp1 = H + SHA512_SIGMA1(E) + SHA_Ch(E,F,G) + K[t] + W[t];
     */
    SHA512_SIGMA1(E, temp1);
    SHA512_ADD(H, temp1, temp2);
    SHA_Ch(E, F, G, temp3);
    SHA512_ADD(temp2, temp3, temp4);
    SHA512_ADD(&K[t2], &W[t2], temp5);
    SHA512_ADD(temp4, temp5, temp1);
    /*
     * temp2 = SHA512_SIGMA0(A) + SHA_Maj(A,B,C);
     */
    SHA512_SIGMA0(A, temp3);
    SHA_Maj(A, B, C, temp4);
    SHA512_ADD(temp3, temp4, temp2);
    H[0] = G[0];
    H[1] = G[1];
    G[0] = F[0];
    G[1] = F[1];
    F[0] = E[0];
    F[1] = E[1];
    SHA512_ADD(D, temp1, E);
    D[0] = C[0];
    D[1] = C[1];
    C[0] = B[0];
    C[1] = B[1];
    B[0] = A[0];
    B[1] = A[1];
    SHA512_ADD(temp1, temp2, A);
  }

  SHA512_ADDTO2(&context->Intermediate_Hash[0], A);
  SHA512_ADDTO2(&context->Intermediate_Hash[2], B);
  SHA512_ADDTO2(&context->Intermediate_Hash[4], C);
  SHA512_ADDTO2(&context->Intermediate_Hash[6], D);
  SHA512_ADDTO2(&context->Intermediate_Hash[8], E);
  SHA512_ADDTO2(&context->Intermediate_Hash[10], F);
  SHA512_ADDTO2(&context->Intermediate_Hash[12], G);
  SHA512_ADDTO2(&context->Intermediate_Hash[14], H);

#else  /* !USE_32BIT_ONLY */
  static const uint64_t K[80] = {
      0x428A2F98D728AE22ll, 0x7137449123EF65CDll, 0xB5C0FBCFEC4D3B2Fll, 0xE9B5DBA58189DBBCll, 0x3956C25BF348B538ll, 0x59F111F1B605D019ll, 0x923F82A4AF194F9Bll,
      0xAB1C5ED5DA6D8118ll, 0xD807AA98A3030242ll, 0x12835B0145706FBEll, 0x243185BE4EE4B28Cll, 0x550C7DC3D5FFB4E2ll, 0x72BE5D74F27B896Fll, 0x80DEB1FE3B1696B1ll,
      0x9BDC06A725C71235ll, 0xC19BF174CF692694ll, 0xE49B69C19EF14AD2ll, 0xEFBE4786384F25E3ll, 0x0FC19DC68B8CD5B5ll, 0x240CA1CC77AC9C65ll, 0x2DE92C6F592B0275ll,
      0x4A7484AA6EA6E483ll, 0x5CB0A9DCBD41FBD4ll, 0x76F988DA831153B5ll, 0x983E5152EE66DFABll, 0xA831C66D2DB43210ll, 0xB00327C898FB213Fll, 0xBF597FC7BEEF0EE4ll,
      0xC6E00BF33DA88FC2ll, 0xD5A79147930AA725ll, 0x06CA6351E003826Fll, 0x142929670A0E6E70ll, 0x27B70A8546D22FFCll, 0x2E1B21385C26C926ll, 0x4D2C6DFC5AC42AEDll,
      0x53380D139D95B3DFll, 0x650A73548BAF63DEll, 0x766A0ABB3C77B2A8ll, 0x81C2C92E47EDAEE6ll, 0x92722C851482353Bll, 0xA2BFE8A14CF10364ll, 0xA81A664BBC423001ll,
      0xC24B8B70D0F89791ll, 0xC76C51A30654BE30ll, 0xD192E819D6EF5218ll, 0xD69906245565A910ll, 0xF40E35855771202All, 0x106AA07032BBD1B8ll, 0x19A4C116B8D2D0C8ll,
      0x1E376C085141AB53ll, 0x2748774CDF8EEB99ll, 0x34B0BCB5E19B48A8ll, 0x391C0CB3C5C95A63ll, 0x4ED8AA4AE3418ACBll, 0x5B9CCA4F7763E373ll, 0x682E6FF3D6B2B8A3ll,
      0x748F82EE5DEFB2FCll, 0x78A5636F43172F60ll, 0x84C87814A1F0AB72ll, 0x8CC702081A6439ECll, 0x90BEFFFA23631E28ll, 0xA4506CEBDE82BDE9ll, 0xBEF9A3F7B2C67915ll,
      0xC67178F2E372532Bll, 0xCA273ECEEA26619Cll, 0xD186B8C721C0C207ll, 0xEADA7DD6CDE0EB1Ell, 0xF57D4F7FEE6ED178ll, 0x06F067AA72176FBAll, 0x0A637DC5A2C898A6ll,
      0x113F9804BEF90DAEll, 0x1B710B35131C471Bll, 0x28DB77F523047D84ll, 0x32CAAB7B40C72493ll, 0x3C9EBE0A15C9BEBCll, 0x431D67C49C100D4Cll, 0x4CC5D4BECB3E42B6ll,
      0x597F299CFC657E2All, 0x5FCB6FAB3AD6FAECll, 0x6C44198C4A475817ll};
  int t, t8;                       /* Loop counter */
  uint64_t temp1, temp2;           /* Temporary word value */
  uint64_t W[80];                  /* Word sequence */
  uint64_t A, B, C, D, E, F, G, H; /* Word buffers */

  /*
   * Initialize the first 16 words in the array W
   */
  for (t = t8 = 0; t < 16; t++, t8 += 8)
    W[t] = ((uint64_t)(context->Message_Block[t8]) << 56) | ((uint64_t)(context->Message_Block[t8 + 1]) << 48) |
           ((uint64_t)(context->Message_Block[t8 + 2]) << 40) | ((uint64_t)(context->Message_Block[t8 + 3]) << 32) |
           ((uint64_t)(context->Message_Block[t8 + 4]) << 24) | ((uint64_t)(context->Message_Block[t8 + 5]) << 16) |
           ((uint64_t)(context->Message_Block[t8 + 6]) << 8) | ((uint64_t)(context->Message_Block[t8 + 7]));

  for (t = 16; t < 80; t++) W[t] = SHA512_sigma1(W[t - 2]) + W[t - 7] + SHA512_sigma0(W[t - 15]) + W[t - 16];

  A = context->Intermediate_Hash[0];
  B = context->Intermediate_Hash[1];
  C = context->Intermediate_Hash[2];
  D = context->Intermediate_Hash[3];
  E = context->Intermediate_Hash[4];
  F = context->Intermediate_Hash[5];
  G = context->Intermediate_Hash[6];
  H = context->Intermediate_Hash[7];

  for (t = 0; t < 80; t++) {
    temp1 = H + SHA512_SIGMA1(E) + SHA_Ch(E, F, G) + K[t] + W[t];
    temp2 = SHA512_SIGMA0(A) + SHA_Maj(A, B, C);
    H = G;
    G = F;
    F = E;
    E = D + temp1;
    D = C;
    C = B;
    B = A;
    A = temp1 + temp2;
  }

  context->Intermediate_Hash[0] += A;
  context->Intermediate_Hash[1] += B;
  context->Intermediate_Hash[2] += C;
  context->Intermediate_Hash[3] += D;
  context->Intermediate_Hash[4] += E;
  context->Intermediate_Hash[5] += F;
  context->Intermediate_Hash[6] += G;
  context->Intermediate_Hash[7] += H;
#endif /* USE_32BIT_ONLY */

  context->Message_Block_Index = 0;
}

/*
 * SHA384_512Reset
 *
 * Description:
 *   This helper function will initialize the SHA512Context in
 *   preparation for computing a new SHA384 or SHA512 message
 *   digest.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to reset.
 *   H0
 *     The initial hash value to use.
 *
 * Returns:
 *   sha Error Code.
 *
 */
#ifdef USE_32BIT_ONLY
static int SHA384_512Reset(SHA512Context *context, uint32_t H0[])
#else  /* !USE_32BIT_ONLY */
static int SHA384_512Reset(SHA512Context *context, uint64_t H0[])
#endif /* USE_32BIT_ONLY */
{
  int i;
  if (!context) return shaNull;

  context->Message_Block_Index = 0;

#ifdef USE_32BIT_ONLY
  context->Length[0] = context->Length[1] = 0;
  context->Length[2] = context->Length[3] = 0;

  for (i = 0; i < SHA512HashSize / 4; i++) context->Intermediate_Hash[i] = H0[i];
#else  /* !USE_32BIT_ONLY */
  context->Length_High = context->Length_Low = 0;

  for (i = 0; i < SHA512HashSize / 8; i++) context->Intermediate_Hash[i] = H0[i];
#endif /* USE_32BIT_ONLY */

  context->Computed = 0;
  context->Corrupted = 0;

  return shaSuccess;
}

/*
 * SHA384_512ResultN
 *
 * Description:
 *   This helper function will return the 384-bit or 512-bit message
 *   digest into the Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 48th/64th element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *   HashSize: [in]
 *     The size of the hash, either 48 or 64.
 *
 * Returns:
 *   sha Error Code.
 *
 */
static int SHA384_512ResultN(SHA512Context *context, uint8_t Message_Digest[], int HashSize) {
  int i;

#ifdef USE_32BIT_ONLY
  int i2;
#endif /* USE_32BIT_ONLY */

  if (!context || !Message_Digest) return shaNull;

  if (context->Corrupted) return context->Corrupted;

  if (!context->Computed) SHA384_512Finalize(context, 0x80);

#ifdef USE_32BIT_ONLY
  for (i = i2 = 0; i < HashSize;) {
    Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 24);
    Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 16);
    Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 8);
    Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2++]);
    Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 24);
    Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 16);
    Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2] >> 8);
    Message_Digest[i++] = (uint8_t)(context->Intermediate_Hash[i2++]);
  }
#else  /* !USE_32BIT_ONLY */
  for (i = 0; i < HashSize; ++i) Message_Digest[i] = (uint8_t)(context->Intermediate_Hash[i >> 3] >> 8 * (7 - (i % 8)));
#endif /* USE_32BIT_ONLY */

  return shaSuccess;
}
/**************************** usha.c ****************************/
/******************** See RFC 4634 for details ******************/
/*
 *  Description:
 *     This file implements a unified interface to the SHA algorithms.
 */

//#include "sha.h"

/*
 *  USHAReset
 *
 *  Description:
 *      This function will initialize the SHA Context in preparation
 *      for computing a new SHA message digest.
 *
 *  Parameters:
 *      context: [in/out]
 *          The context to reset.
 *      whichSha: [in]
 *          Selects which SHA reset to call
 *
 *  Returns:
 *      sha Error Code.
 *
 */
inline int USHAReset(USHAContext *ctx, enum SHAversion whichSha) {
  if (ctx) {
    ctx->whichSha = whichSha;
    switch (whichSha) {
      case SHA1:
        return SHA1Reset((SHA1Context *)&ctx->ctx);
      case SHA224:
        return SHA224Reset((SHA224Context *)&ctx->ctx);
      case SHA256:
        return SHA256Reset((SHA256Context *)&ctx->ctx);
      case SHA384:
        return SHA384Reset((SHA384Context *)&ctx->ctx);
      case SHA512:
        return SHA512Reset((SHA512Context *)&ctx->ctx);
      default:
        return shaBadParam;
    }
  } else {
    return shaNull;
  }
}

/*
 *  USHAInput
 *
 *  Description:
 *      This function accepts an array of octets as the next portion
 *      of the message.
 *
 *  Parameters:
 *      context: [in/out]
 *          The SHA context to update
 *      message_array: [in]
 *          An array of characters representing the next portion of
 *          the message.
 *      length: [in]
 *          The length of the message in message_array
 *
 *  Returns:
 *      sha Error Code.
 *
 */
inline int USHAInput(USHAContext *ctx, const uint8_t *bytes, unsigned int bytecount) {
  if (ctx) {
    switch (ctx->whichSha) {
      case SHA1:
        return SHA1Input((SHA1Context *)&ctx->ctx, bytes, bytecount);
      case SHA224:
        return SHA224Input((SHA224Context *)&ctx->ctx, bytes, bytecount);
      case SHA256:
        return SHA256Input((SHA256Context *)&ctx->ctx, bytes, bytecount);
      case SHA384:
        return SHA384Input((SHA384Context *)&ctx->ctx, bytes, bytecount);
      case SHA512:
        return SHA512Input((SHA512Context *)&ctx->ctx, bytes, bytecount);
      default:
        return shaBadParam;
    }
  } else {
    return shaNull;
  }
}

/*
 * USHAFinalBits
 *
 * Description:
 *   This function will add in any final bits of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update
 *   message_bits: [in]
 *     The final bits of the message, in the upper portion of the
 *     byte. (Use 0b###00000 instead of 0b00000### to input the
 *     three bits ###.)
 *   length: [in]
 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 */
inline int USHAFinalBits(USHAContext *ctx, const uint8_t bits, unsigned int bitcount) {
  if (ctx) {
    switch (ctx->whichSha) {
      case SHA1:
        return SHA1FinalBits((SHA1Context *)&ctx->ctx, bits, bitcount);
      case SHA224:
        return SHA224FinalBits((SHA224Context *)&ctx->ctx, bits, bitcount);
      case SHA256:
        return SHA256FinalBits((SHA256Context *)&ctx->ctx, bits, bitcount);
      case SHA384:
        return SHA384FinalBits((SHA384Context *)&ctx->ctx, bits, bitcount);
      case SHA512:
        return SHA512FinalBits((SHA512Context *)&ctx->ctx, bits, bitcount);
      default:
        return shaBadParam;
    }
  } else {
    return shaNull;
  }
}

/*
 * USHAResult
 *
 * Description:
 *   This function will return the 160-bit message digest into the
 *   Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the 19th element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the SHA-1 hash.
 *   Message_Digest: [out]
 *     Where the digest is returned.
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int USHAResult(USHAContext *ctx, uint8_t Message_Digest[USHAMaxHashSize]) {
  if (ctx) {
    switch (ctx->whichSha) {
      case SHA1:
        return SHA1Result((SHA1Context *)&ctx->ctx, Message_Digest);
      case SHA224:
        return SHA224Result((SHA224Context *)&ctx->ctx, Message_Digest);
      case SHA256:
        return SHA256Result((SHA256Context *)&ctx->ctx, Message_Digest);
      case SHA384:
        return SHA384Result((SHA384Context *)&ctx->ctx, Message_Digest);
      case SHA512:
        return SHA512Result((SHA512Context *)&ctx->ctx, Message_Digest);
      default:
        return shaBadParam;
    }
  } else {
    return shaNull;
  }
}

/*
 * USHABlockSize
 *
 * Description:
 *   This function will return the blocksize for the given SHA
 *   algorithm.
 *
 * Parameters:
 *   whichSha:
 *     which SHA algorithm to query
 *
 * Returns:
 *   block size
 *
 */
inline int USHABlockSize(enum SHAversion whichSha) {
  switch (whichSha) {
    case SHA1:
      return SHA1_Message_Block_Size;
    case SHA224:
      return SHA224_Message_Block_Size;
    case SHA256:
      return SHA256_Message_Block_Size;
    case SHA384:
      return SHA384_Message_Block_Size;
    default:
    case SHA512:
      return SHA512_Message_Block_Size;
  }
}

/*
 * USHAHashSize
 *
 * Description:
 *   This function will return the hashsize for the given SHA
 *   algorithm.
 *
 * Parameters:
 *   whichSha:
 *     which SHA algorithm to query
 *
 * Returns:
 *   hash size
 *
 */
inline int USHAHashSize(enum SHAversion whichSha) {
  switch (whichSha) {
    case SHA1:
      return SHA1HashSize;
    case SHA224:
      return SHA224HashSize;
    case SHA256:
      return SHA256HashSize;
    case SHA384:
      return SHA384HashSize;
    default:
    case SHA512:
      return SHA512HashSize;
  }
}

/*
 * USHAHashSizeBits
 *
 * Description:
 *   This function will return the hashsize for the given SHA
 *   algorithm, expressed in bits.
 *
 * Parameters:
 *   whichSha:
 *     which SHA algorithm to query
 *
 * Returns:
 *   hash size in bits
 *
 */
inline int USHAHashSizeBits(enum SHAversion whichSha) {
  switch (whichSha) {
    case SHA1:
      return SHA1HashSizeBits;
    case SHA224:
      return SHA224HashSizeBits;
    case SHA256:
      return SHA256HashSizeBits;
    case SHA384:
      return SHA384HashSizeBits;
    default:
    case SHA512:
      return SHA512HashSizeBits;
  }
}
/*
 *  hmac
 *
 *  Description:
 *      This function will compute an HMAC message digest.
 *
 *  Parameters:
 *      whichSha: [in]
 *          One of SHA1, SHA224, SHA256, SHA384, SHA512
 *      key: [in]
 *          The secret shared key.
 *      key_len: [in]
 *          The length of the secret shared key.
 *      message_array: [in]
 *          An array of characters representing the message.
 *      length: [in]
 *          The length of the message in message_array
 *      digest: [out]
 *          Where the digest is returned.
 *          NOTE: The length of the digest is determined by
 *              the value of whichSha.
 *
 *  Returns:
 *      sha Error Code.
 *
 */
inline int hmac(SHAversion whichSha, const unsigned char *text, int text_len, const unsigned char *key, int key_len, uint8_t digest[USHAMaxHashSize]) {
  HMACContext ctx;
  return hmacReset(&ctx, whichSha, key, key_len) || hmacInput(&ctx, text, text_len) || hmacResult(&ctx, digest);
}

/*
 *  hmacReset
 *
 *  Description:
 *      This function will initialize the hmacContext in preparation
 *      for computing a new HMAC message digest.
 *
 *  Parameters:
 *      context: [in/out]
 *          The context to reset.
 *      whichSha: [in]
 *          One of SHA1, SHA224, SHA256, SHA384, SHA512
 *      key: [in]
 *          The secret shared key.
 *      key_len: [in]
 *          The length of the secret shared key.
 *
 *  Returns:
 *      sha Error Code.
 *
 */
inline int hmacReset(HMACContext *ctx, enum SHAversion whichSha, const unsigned char *key, int key_len) {
  int i, blocksize, hashsize;

  /* inner padding - key XORd with ipad */
  unsigned char k_ipad[USHA_Max_Message_Block_Size];

  /* temporary buffer when keylen > blocksize */
  unsigned char tempkey[USHAMaxHashSize];

  if (!ctx) return shaNull;

  blocksize = ctx->blockSize = USHABlockSize(whichSha);
  hashsize = ctx->hashSize = USHAHashSize(whichSha);

  ctx->whichSha = whichSha;

  /*
   * If key is longer than the hash blocksize,
   * reset it to key = HASH(key).
   */
  if (key_len > blocksize) {
    USHAContext tctx;
    int err = USHAReset(&tctx, whichSha) || USHAInput(&tctx, key, key_len) || USHAResult(&tctx, tempkey);
    if (err != shaSuccess) return err;

    key = tempkey;
    key_len = hashsize;
  }

  /*
   * The HMAC transform looks like:
   *
   * SHA(K XOR opad, SHA(K XOR ipad, text))
   *
   * where K is an n byte key.
   * ipad is the byte 0x36 repeated blocksize times
   * opad is the byte 0x5c repeated blocksize times
   * and text is the data being protected.
   */

  /* store key into the pads, XOR'd with ipad and opad values */
  for (i = 0; i < key_len; i++) {
    k_ipad[i] = key[i] ^ 0x36;
    ctx->k_opad[i] = key[i] ^ 0x5c;
  }
  /* remaining pad bytes are '\0' XOR'd with ipad and opad values */
  for (; i < blocksize; i++) {
    k_ipad[i] = 0x36;
    ctx->k_opad[i] = 0x5c;
  }

  /* perform inner hash */
  /* init context for 1st pass */
  return USHAReset(&ctx->shaContext, whichSha) ||
         /* and start with inner pad */
         USHAInput(&ctx->shaContext, k_ipad, blocksize);
}

/*
 *  hmacInput
 *
 *  Description:
 *      This function accepts an array of octets as the next portion
 *      of the message.
 *
 *  Parameters:
 *      context: [in/out]
 *          The HMAC context to update
 *      message_array: [in]
 *          An array of characters representing the next portion of
 *          the message.
 *      length: [in]
 *          The length of the message in message_array
 *
 *  Returns:
 *      sha Error Code.
 *
 */
inline int hmacInput(HMACContext *ctx, const unsigned char *text, int text_len) {
  if (!ctx) return shaNull;
  /* then text of datagram */
  return USHAInput(&ctx->shaContext, text, text_len);
}

/*
 * HMACFinalBits
 *
 * Description:
 *   This function will add in any final bits of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The HMAC context to update
 *   message_bits: [in]
 *     The final bits of the message, in the upper portion of the
 *     byte. (Use 0b###00000 instead of 0b00000### to input the
 *     three bits ###.)
 *   length: [in]
 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 */
inline int hmacFinalBits(HMACContext *ctx, const uint8_t bits, unsigned int bitcount) {
  if (!ctx) return shaNull;
  /* then final bits of datagram */
  return USHAFinalBits(&ctx->shaContext, bits, bitcount);
}

/*
 * HMACResult
 *
 * Description:
 *   This function will return the N-byte message digest into the
 *   Message_Digest array provided by the caller.
 *   NOTE: The first octet of hash is stored in the 0th element,
 *      the last octet of hash in the Nth element.
 *
 * Parameters:
 *   context: [in/out]
 *     The context to use to calculate the HMAC hash.
 *   digest: [out]
 *     Where the digest is returned.
 *   NOTE 2: The length of the hash is determined by the value of
 *      whichSha that was passed to hmacReset().
 *
 * Returns:
 *   sha Error Code.
 *
 */
inline int hmacResult(HMACContext *ctx, uint8_t *digest) {
  if (!ctx) return shaNull;

  /* finish up 1st pass */
  /* (Use digest here as a temporary buffer.) */
  return USHAResult(&ctx->shaContext, digest) ||
         /* perform outer SHA */
         /* init context for 2nd pass */
         USHAReset(&ctx->shaContext, (SHAversion)ctx->whichSha) ||
         /* start with outer pad */
         USHAInput(&ctx->shaContext, ctx->k_opad, ctx->blockSize) ||
         /* then results of 1st hash */
         USHAInput(&ctx->shaContext, digest, ctx->hashSize) ||
         /* finish up 2nd pass */
         USHAResult(&ctx->shaContext, digest);
}
}
#include "ccapi_cpp/ccapi_logger.h"
#include "ccapi_cpp/ccapi_macro.h"
namespace ccapi {
class Hmac CCAPI_FINAL {
  // https://github.com/Yubico/yubico-c-client/blob/ykclient-2.15/sha384-512.c
 public:
  enum class ShaVersion {
    UNKNOWN,
    SHA1,
    SHA224,
    SHA256,
    SHA384,
    SHA512,
  };
  static std::string hmacYubico(const ShaVersion shaVersion, const std::string &key, const std::string &msg, bool returnHex = false) {
    yubico::SHAversion whichSha{};
    int shaHashSize{};
    switch (shaVersion) {
      case ShaVersion::SHA1:
        whichSha = yubico::SHAversion::SHA1;
        shaHashSize = yubico::SHA1HashSize;
        break;
      case ShaVersion::SHA224:
        whichSha = yubico::SHAversion::SHA224;
        shaHashSize = yubico::SHA224HashSize;
        break;
      case ShaVersion::SHA256:
        whichSha = yubico::SHAversion::SHA256;
        shaHashSize = yubico::SHA256HashSize;
        break;
      case ShaVersion::SHA384:
        whichSha = yubico::SHAversion::SHA384;
        shaHashSize = yubico::SHA384HashSize;
        break;
      case ShaVersion::SHA512:
        whichSha = yubico::SHAversion::SHA512;
        shaHashSize = yubico::SHA512HashSize;
        break;
      default:
        CCAPI_LOGGER_FATAL(CCAPI_UNSUPPORTED_VALUE);
    }
    uint8_t digest[yubico::USHAMaxHashSize];
    int err = yubico::hmac(whichSha, reinterpret_cast<unsigned char *>(const_cast<char *>(msg.c_str())), msg.length(),
                           reinterpret_cast<unsigned char *>(const_cast<char *>(key.c_str())), key.length(), digest);
    if (err != yubico::shaSuccess) {
      throw std::runtime_error("hmac sha error");
    }
    std::stringstream ss;
    if (returnHex) {
      ss << std::hex << std::setfill('0');
      for (int i = 0; i < shaHashSize; i++) {
        ss << std::hex << std::setw(2) << (unsigned int)digest[i];
      }
    } else {
      for (int i = 0; i < shaHashSize; i++) {
        ss << (char)digest[i];
      }
    }
    return ss.str();
  }
  static std::string hmac(const ShaVersion shaVersion, const std::string &key, const std::string &msg, bool returnHex = false) {
#ifdef CCAPI_SHA_USE_OPENSSL
    if (shaVersion == ShaVersion::SHA256) {
      unsigned char hash[32];
      HMAC_CTX *hmac = HMAC_CTX_new();
      HMAC_Init_ex(hmac, &key[0], key.length(), EVP_sha256(), NULL);
      HMAC_Update(hmac, (unsigned char *)&msg[0], msg.length());
      unsigned int len = 32;
      HMAC_Final(hmac, hash, &len);
      HMAC_CTX_free(hmac);
      std::stringstream ss;
      if (returnHex) {
        ss << std::hex << std::setfill('0');
        for (int i = 0; i < len; i++) {
          ss << std::hex << std::setw(2) << (unsigned int)hash[i];
        }
      } else {
        for (int i = 0; i < len; i++) {
          ss << (char)hash[i];
        }
      }
      return (ss.str());
    } else {
      return hmacYubico(shaVersion, key, msg, returnHex);
    }
#else
    return hmacYubico(shaVersion, key, msg, returnHex);
#endif
  }
};
} /* namespace ccapi */
#endif  // INCLUDE_CCAPI_CPP_CCAPI_HMAC_H_