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<?xml version='1.0' encoding='iso-8859-1'?>
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<title>
SHA256Block.c
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/*====================================================================*
*
* void SHA256Block (struct sha256 * sha256, void const * memory);
*
* SHA256.h
*
* encode a fixed-length block of memory into the hash buffer and
* update the hash state; the length is implicit in the algorithm
* and need not be specified as an argument;
*
* Read standard FIPS180-2 sec 5.3.2 for an explanation;
*
* Motley Tools by Charles Maier <cmaier@cmassoc.net>;
* Copyright (c) 2001-2006 by Charles Maier Associates;
* Licensed under the Internet Software Consortium License;
*
*--------------------------------------------------------------------*/
#ifndef SHA256MERGE_SOURCE
#define SHA256MERGE_SOURCE
#include <stdio.h>
#include "../key/SHA256.h"
#define SHR(word,bits) ((word & 0xFFFFFFFF) >> bits)
#define ROTR(word,bits) (SHR(word,bits) | (word << (32 - bits)))
void SHA256Block (struct sha256 * sha256, void const * memory)
{
static const uint32_t K [sizeof (sha256->block)] =
{
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
};
unsigned pass;
unsigned word;
uint32_t H [sizeof (sha256->state)/sizeof (uint32_t)];
uint32_t W [sizeof (sha256->block)];
uint8_t * buffer = (uint8_t *)(memory);
for (word = 0; word < 16; word++)
{
W [word] = 0;
W [word] |= (uint32_t)(*buffer++) << 24;
W [word] |= (uint32_t)(*buffer++) << 16;
W [word] |= (uint32_t)(*buffer++) << 8;
W [word] |= (uint32_t)(*buffer++) << 0;;
}
for ( ; word < sizeof (sha256->block); word++)
{
uint32_t s0 = ROTR (W [word-15], 7) ^ ROTR (W [word-15], 18) ^ SHR (W [word-15], 3);
uint32_t s1 = ROTR (W [word- 2], 17) ^ ROTR (W [word- 2], 19) ^ SHR (W [word- 2], 10);
W [word] = W [word - 16] + s0 + W [word - 7] + s1;
}
for (word = 0; word < (sizeof (sha256->state) / sizeof (uint32_t)); word++)
{
H [word] = sha256->state [word];
}
for (pass = 0; pass < sizeof (sha256->block); pass++)
{
uint32_t s2 = ROTR (H [0], 2) ^ ROTR (H [0], 13) ^ ROTR (H [0], 22);
uint32_t maj = (H [0] & H [1]) ^ (H [0] & H [2]) ^ (H [1] & H [2]);
uint32_t t2 = s2 + maj;
uint32_t s3 = ROTR (H [4], 6) ^ ROTR (H [4], 11) ^ ROTR (H [4], 25);
uint32_t ch = (H [4] & H [5]) ^ ((~ H [4]) & H [6]);
uint32_t t1 = H [7] + s3 + ch + K [pass] + W [pass];
for (word = (sizeof (sha256->state) / sizeof (uint32_t)) - 1; word > 0; word--)
{
H [word] = H [word-1];
}
H [0] = t1 + t2;
H [4] += t1;
}
for (word = 0; word < (sizeof (sha256->state) / sizeof (uint32_t)); word++)
{
sha256->state [word] += H [word];
}
return;
}
#endif
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