/************************* sha384-512.c ************************/

/***************** See RFC 6234 for details. *******************/

/* Copyright (c) 2011 IETF Trust and the persons identified as */

/* authors of the code.  All rights reserved.                  */

/* See sha.h for terms of use and redistribution.              */

/*

 * Description:

 *   This file implements the Secure Hash Algorithms SHA-384 and

 *   SHA-512 as defined in the U.S. National Institute of Standards

 *   and Technology Federal Information Processing Standards

 *   Publication (FIPS PUB) 180-3 published in October 2008

 *   and formerly defined in its predecessors, FIPS PUB 180-1

 *   and FIP PUB 180-2.

 *

 *   A combined document showing all algorithms is available at

 *       http://csrc.nist.gov/publications/fips/

 *              fips180-3/fips180-3_final.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

 *   octet, and then optionally uses SHA384/256FinalBits()

 *   to hash the final few bits of the input.

 *

 */

#include "sha.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)) )

#ifndef USE_MODIFIED_MACROS

/*

 * These definitions are the ones used in FIPS 180-3, 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_MODIFIED_MACROS */

/*

 * These definitions are potentially faster equivalents for the ones

 * used in FIPS 180-3, 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.

 * Set Corrupted when overflow has occurred.

 */

static uint32_t addTemp[4] = { 0, 0, 0, 0 };

#define SHA384_512AddLength(context, length) (                        \

    addTemp[3] = (length), SHA512_ADDTO4((context)->Length, addTemp), \

    (context)->Corrupted = (((context)->Length[3] < (length)) &&      \

       ((context)->Length[2] == 0) && ((context)->Length[1] == 0) &&  \

       ((context)->Length[0] == 0)) ? shaInputTooLong :               \

                                      (context)->Corrupted )

/* Local Function Prototypes */

static int SHA384_512Reset(SHA512Context *context,

                           uint32_t H0[SHA512HashSize/4]);

static void SHA384_512ProcessMessageBlock(SHA512Context *context);

static void SHA384_512Finalize(SHA512Context *context,

  uint8_t Pad_Byte);

static void SHA384_512PadMessage(SHA512Context *context,

  uint8_t Pad_Byte);

static int SHA384_512ResultN( SHA512Context *context,

  uint8_t Message_Digest[ ], int HashSize);

/* Initial Hash Values: FIPS 180-3 sections 5.3.4 and 5.3.5 */

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 */

#include "sha-private.h"

/* Define the SHA shift, rotate left and rotate right macros */

#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

 *

 *  SHA512_ROTR(28,word) ^ SHA512_ROTR(34,word) ^ SHA512_ROTR(39,word)

 */

#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.

 * Set Corrupted when overflow has occurred.

 */

/* addTemp commented out by Nokia, static variables are not thread-safe */

/* static uint64_t addTemp; */

/* 'M' appended to Macro name by Nokia */

#define SHA384_512AddLengthM(context, length)                  \

   (addTemp = context->Length_Low, context->Corrupted =        \

    ((context->Length_Low += length) < addTemp) &&             \

    (++context->Length_High == 0) ? shaInputTooLong :          \

                                    (context)->Corrupted)

/* Local Function Prototypes */

static int SHA384_512Reset(SHA512Context *context,

                           uint64_t H0[SHA512HashSize/8]);

static void SHA384_512ProcessMessageBlock(SHA512Context *context);

static void SHA384_512Finalize(SHA512Context *context,

  uint8_t Pad_Byte);

static void SHA384_512PadMessage(SHA512Context *context,

  uint8_t Pad_Byte);

static int SHA384_512ResultN(SHA512Context *context,

  uint8_t Message_Digest[ ], int HashSize);

/* Initial Hash Values: FIPS 180-3 sections 5.3.4 and 5.3.5 */

static uint64_t SHA384_H0[ ] = {

    0xCBBB9D5DC1059ED8ull, 0x629A292A367CD507ull, 0x9159015A3070DD17ull,

    0x152FECD8F70E5939ull, 0x67332667FFC00B31ull, 0x8EB44A8768581511ull,

    0xDB0C2E0D64F98FA7ull, 0x47B5481DBEFA4FA4ull

};

static uint64_t SHA512_H0[ ] = {

    0x6A09E667F3BCC908ull, 0xBB67AE8584CAA73Bull, 0x3C6EF372FE94F82Bull,

    0xA54FF53A5F1D36F1ull, 0x510E527FADE682D1ull, 0x9B05688C2B3E6C1Full,

    0x1F83D9ABFB41BD6Bull, 0x5BE0CD19137E2179ull

};

#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.

 *

 */

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 octets representing the next portion of

 *     the message.

 *   length: [in]

 *     The length of the message in message_array.

 *

 * Returns:

 *   sha Error Code.

 *

 */

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.

 *

 */

int SHA384FinalBits(SHA384Context *context,

                    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 element with index 0,

 *    the last octet of hash in the element with index 47.

 *

 * 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.

 *

 */

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.

 *

 */

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 octets representing the next portion of

 *     the message.

 *   length: [in]

 *     The length of the message in message_array.

 *

 * Returns:

 *   sha Error Code.

 *

 */

int SHA512Input(SHA512Context *context,

        const uint8_t *message_array,

        unsigned int length)

{

  if (!context) return shaNull;

  if (!length) return shaSuccess;

  if (!message_array) return shaNull;

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

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

  while (length--) {

    context->Message_Block[context->Message_Block_Index++] =

            *message_array;

    if ((SHA384_512AddLength(context, 8) == shaSuccess) &&

      (context->Message_Block_Index == SHA512_Message_Block_Size))

      SHA384_512ProcessMessageBlock(context);

    message_array++;

  }

  return context->Corrupted;

}

/*

 * 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.

 *

 */

int SHA512FinalBits(SHA512Context *context,

                    uint8_t message_bits, unsigned int length)

{

  static 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

  };

  static 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 (!context) return shaNull;

  if (!length) return shaSuccess;

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

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

  if (length >= 8) return context->Corrupted = shaBadParam;

  SHA384_512AddLength(context, length);

  SHA384_512Finalize(context, (uint8_t)

    ((message_bits & masks[length]) | markbit[length]));

  return context->Corrupted;

}

/*

 * 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 element with index 0,

 *    the last octet of hash in the element with index 63.

 *

 * 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.

 *

 */

int SHA512Result(SHA512Context *context,

    uint8_t Message_Digest[SHA512HashSize])

{

  return SHA384_512ResultN(context, Message_Digest, SHA512HashSize);

}

/*

 * 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[ ]: [in]

 *     The initial hash value array to use.

 *

 * Returns:

 *   sha Error Code.

 *

 */

#ifdef USE_32BIT_ONLY

static int SHA384_512Reset(SHA512Context *context,

                           uint32_t H0[SHA512HashSize/4])

#else /* !USE_32BIT_ONLY */

static int SHA384_512Reset(SHA512Context *context,

                           uint64_t H0[SHA512HashSize/8])

#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] =

  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 = shaSuccess;

  return shaSuccess;

}

/*

 * 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 Secure Hash Standard.

 *

 *

 */

static void SHA384_512ProcessMessageBlock(SHA512Context *context)

{

#ifdef USE_32BIT_ONLY

  /* Constants defined in FIPS 180-3, section 4.2.3 */

  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 */

  /* Constants defined in FIPS 180-3, section 4.2.3 */

  static const uint64_t K[80] = {

      0x428A2F98D728AE22ull, 0x7137449123EF65CDull, 0xB5C0FBCFEC4D3B2Full,

      0xE9B5DBA58189DBBCull, 0x3956C25BF348B538ull, 0x59F111F1B605D019ull,

      0x923F82A4AF194F9Bull, 0xAB1C5ED5DA6D8118ull, 0xD807AA98A3030242ull,

      0x12835B0145706FBEull, 0x243185BE4EE4B28Cull, 0x550C7DC3D5FFB4E2ull,

      0x72BE5D74F27B896Full, 0x80DEB1FE3B1696B1ull, 0x9BDC06A725C71235ull,

      0xC19BF174CF692694ull, 0xE49B69C19EF14AD2ull, 0xEFBE4786384F25E3ull,

      0x0FC19DC68B8CD5B5ull, 0x240CA1CC77AC9C65ull, 0x2DE92C6F592B0275ull,

      0x4A7484AA6EA6E483ull, 0x5CB0A9DCBD41FBD4ull, 0x76F988DA831153B5ull,

      0x983E5152EE66DFABull, 0xA831C66D2DB43210ull, 0xB00327C898FB213Full,

      0xBF597FC7BEEF0EE4ull, 0xC6E00BF33DA88FC2ull, 0xD5A79147930AA725ull,

      0x06CA6351E003826Full, 0x142929670A0E6E70ull, 0x27B70A8546D22FFCull,

      0x2E1B21385C26C926ull, 0x4D2C6DFC5AC42AEDull, 0x53380D139D95B3DFull,

      0x650A73548BAF63DEull, 0x766A0ABB3C77B2A8ull, 0x81C2C92E47EDAEE6ull,

      0x92722C851482353Bull, 0xA2BFE8A14CF10364ull, 0xA81A664BBC423001ull,

      0xC24B8B70D0F89791ull, 0xC76C51A30654BE30ull, 0xD192E819D6EF5218ull,

      0xD69906245565A910ull, 0xF40E35855771202Aull, 0x106AA07032BBD1B8ull,

      0x19A4C116B8D2D0C8ull, 0x1E376C085141AB53ull, 0x2748774CDF8EEB99ull,

      0x34B0BCB5E19B48A8ull, 0x391C0CB3C5C95A63ull, 0x4ED8AA4AE3418ACBull,

      0x5B9CCA4F7763E373ull, 0x682E6FF3D6B2B8A3ull, 0x748F82EE5DEFB2FCull,

      0x78A5636F43172F60ull, 0x84C87814A1F0AB72ull, 0x8CC702081A6439ECull,

      0x90BEFFFA23631E28ull, 0xA4506CEBDE82BDE9ull, 0xBEF9A3F7B2C67915ull,

      0xC67178F2E372532Bull, 0xCA273ECEEA26619Cull, 0xD186B8C721C0C207ull,

      0xEADA7DD6CDE0EB1Eull, 0xF57D4F7FEE6ED178ull, 0x06F067AA72176FBAull,

      0x0A637DC5A2C898A6ull, 0x113F9804BEF90DAEull, 0x1B710B35131C471Bull,

      0x28DB77F523047D84ull, 0x32CAAB7B40C72493ull, 0x3C9EBE0A15C9BEBCull,

      0x431D67C49C100D4Cull, 0x4CC5D4BECB3E42B6ull, 0x597F299CFC657E2Aull,

      0x5FCB6FAB3AD6FAECull, 0x6C44198C4A475817ull

  };

  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_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 message block 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_High = context->Length_Low = 0;

#endif /* USE_32BIT_ONLY */

  context->Computed = 1;

}

/*

 * SHA384_512PadMessage

 *

 * Description:

 *   According to the standard, the message must be padded to the next

 *   even multiple of 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 message block 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_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 element with index 0,

 *    the last octet of hash in the element with index 47/63.

 *

 * 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) return shaNull;

  if (!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;

}