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sha512_224.c
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sha512_224.c
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#include "shs.h"
static uint32_t endian = 0xaabcdeff;
// constants
static unsigned long long K[80] = {
0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f,
0xe9b5dba58189dbbc, 0x3956c25bf348b538, 0x59f111f1b605d019,
0x923f82a4af194f9b, 0xab1c5ed5da6d8118, 0xd807aa98a3030242,
0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2,
0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235,
0xc19bf174cf692694, 0xe49b69c19ef14ad2, 0xefbe4786384f25e3,
0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65, 0x2de92c6f592b0275,
0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5,
0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f,
0xbf597fc7beef0ee4, 0xc6e00bf33da88fc2, 0xd5a79147930aa725,
0x06ca6351e003826f, 0x142929670a0e6e70, 0x27b70a8546d22ffc,
0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df,
0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6,
0x92722c851482353b, 0xa2bfe8a14cf10364, 0xa81a664bbc423001,
0xc24b8b70d0f89791, 0xc76c51a30654be30, 0xd192e819d6ef5218,
0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8,
0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99,
0x34b0bcb5e19b48a8, 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb,
0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3, 0x748f82ee5defb2fc,
0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec,
0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915,
0xc67178f2e372532b, 0xca273eceea26619c, 0xd186b8c721c0c207,
0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, 0x06f067aa72176fba,
0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b,
0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc,
0x431d67c49c100d4c, 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a,
0x5fcb6fab3ad6faec, 0x6c44198c4a475817};
static unsigned long long initials[8] = {
0x8c3d37c819544da2, 0x73e1996689dcd4d6, 0x1dfab7ae32ff9c82,
0x679dd514582f9fcf, 0x0f6d2b697bd44da8, 0x77e36f7304c48942,
0x3f9d85a86a1d36c8, 0x1112e6ad91d692a1};
#define BLOCK_BYTE_CNT 128 // 1024 bits
#define ROTR(x, n) (((x) >> (n)) | ((x) << (64 - (n))))
#define SHR(x, n) (((x) >> (n)))
#define CH(x, y, z) (((x) & (y)) ^ (~(x) & (z)))
#define MAJ(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define USIG0(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
#define USIG1(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
#define LSIG0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHR(x, 7))
#define LSIG1(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHR(x, 6))
static uint64_t endian_reverse64(uint64_t n) {
unsigned char *np = (unsigned char *)&n;
return ((uint64_t)np[0] << 56) | ((uint64_t)np[1] << 48) |
((uint64_t)np[2] << 40) | ((uint64_t)np[3] << 32) |
((uint64_t)np[4] << 24) | ((uint64_t)np[5] << 16) |
((uint64_t)np[6] << 8) | (uint64_t)np[7];
}
static int compute_block(Sha512_224 *sha) {
unsigned long long var_a;
unsigned long long var_b;
unsigned long long var_c;
unsigned long long var_d;
unsigned long long var_e;
unsigned long long var_f;
unsigned long long var_g;
unsigned long long var_h;
unsigned long long W[80];
unsigned long long T1;
unsigned long long T2;
// prepare message schedule
for (int t = 0; t <= 15; t++) {
W[t] = ((unsigned long long)sha->msg_block[t * 8]) << 56;
W[t] |= ((unsigned long long)sha->msg_block[t * 8 + 1]) << 48;
W[t] |= ((unsigned long long)sha->msg_block[t * 8 + 2]) << 40;
W[t] |= ((unsigned long long)sha->msg_block[t * 8 + 3]) << 32;
W[t] |= ((unsigned long long)sha->msg_block[t * 8 + 4]) << 24;
W[t] |= ((unsigned long long)sha->msg_block[t * 8 + 5]) << 16;
W[t] |= ((unsigned long long)sha->msg_block[t * 8 + 6]) << 8;
W[t] |= ((unsigned long long)sha->msg_block[t * 8 + 7]);
}
for (int t = 16; t <= 79; t++) {
W[t] = LSIG1(W[t - 2]) + W[t - 7] + LSIG0(W[t - 15]) + W[t - 16];
}
// initialize working variables
var_a = sha->msg_digest[0];
var_b = sha->msg_digest[1];
var_c = sha->msg_digest[2];
var_d = sha->msg_digest[3];
var_e = sha->msg_digest[4];
var_f = sha->msg_digest[5];
var_g = sha->msg_digest[6];
var_h = sha->msg_digest[7];
// do the math
for (int t = 0; t <= 79; t++) {
T1 = var_h + USIG1(var_e) + CH(var_e, var_f, var_g) + K[t] + W[t];
T2 = USIG0(var_a) + MAJ(var_a, var_b, var_c);
var_h = var_g;
var_g = var_f;
var_f = var_e;
var_e = var_d + T1;
var_d = var_c;
var_c = var_b;
var_b = var_a;
var_a = T1 + T2;
}
// compute intermediate hash value
sha->msg_digest[0] += var_a;
sha->msg_digest[1] += var_b;
sha->msg_digest[2] += var_c;
sha->msg_digest[3] += var_d;
sha->msg_digest[4] += var_e;
sha->msg_digest[5] += var_f;
sha->msg_digest[6] += var_g;
sha->msg_digest[7] += var_h;
sha->byte_idx = 0;
return 1;
}
Sha512_224 *sha512_224_new() {
Sha512_224 *sha;
sha = malloc(sizeof(Sha512_224));
sha->byte_idx = 0;
sha->bit_cnt[0] = 0;
sha->bit_cnt[1] = 0;
sha->msg_digest[0] = initials[0];
sha->msg_digest[1] = initials[1];
sha->msg_digest[2] = initials[2];
sha->msg_digest[3] = initials[3];
sha->msg_digest[4] = initials[4];
sha->msg_digest[5] = initials[5];
sha->msg_digest[6] = initials[6];
sha->msg_digest[7] = initials[7];
return sha;
}
int sha512_224_load(Sha512_224 *sha, const unsigned char data[],
const unsigned int len) {
if (!len) return 0;
sha->bit_cnt[0] += (unsigned long long)len * 8;
if (sha->bit_cnt[0] < ((uint64_t)len * 8)) sha->bit_cnt[1]++;
for (unsigned int i = 0; i < len; ++i) {
sha->msg_block[sha->byte_idx++] = data[i];
if (sha->byte_idx == BLOCK_BYTE_CNT) {
compute_block(sha);
}
}
return 1;
}
int sha512_224_hash(Sha512_224 *sha) {
// append 1 to end of message
sha->msg_block[sha->byte_idx++] = 0x80;
// process last block of data if necessary and zero out rest of block
if (sha->byte_idx < BLOCK_BYTE_CNT - 8) {
while (sha->byte_idx < BLOCK_BYTE_CNT - 8) {
sha->msg_block[sha->byte_idx++] = 0;
}
} else {
while (sha->byte_idx < BLOCK_BYTE_CNT) {
sha->msg_block[sha->byte_idx++] = 0;
}
compute_block(sha);
while (sha->byte_idx < 56) {
sha->msg_block[sha->byte_idx++] = 0;
}
}
// copy bit count into last 128 bit block
sha->msg_block[112] = sha->bit_cnt[1] >> 56;
sha->msg_block[113] = sha->bit_cnt[1] >> 48;
sha->msg_block[114] = sha->bit_cnt[1] >> 40;
sha->msg_block[115] = sha->bit_cnt[1] >> 32;
sha->msg_block[116] = sha->bit_cnt[1] >> 24;
sha->msg_block[117] = sha->bit_cnt[1] >> 16;
sha->msg_block[118] = sha->bit_cnt[1] >> 8;
sha->msg_block[119] = sha->bit_cnt[1];
sha->msg_block[120] = sha->bit_cnt[0] >> 56;
sha->msg_block[121] = sha->bit_cnt[0] >> 48;
sha->msg_block[122] = sha->bit_cnt[0] >> 40;
sha->msg_block[123] = sha->bit_cnt[0] >> 32;
sha->msg_block[124] = sha->bit_cnt[0] >> 24;
sha->msg_block[125] = sha->bit_cnt[0] >> 16;
sha->msg_block[126] = sha->bit_cnt[0] >> 8;
sha->msg_block[127] = sha->bit_cnt[0];
compute_block(sha);
// flip byte ordering to big endian and truncate to 224 bits
if (*(const unsigned char *)&endian == 0xff) {
sha->msg_digest[0] = endian_reverse64(sha->msg_digest[0]);
sha->msg_digest[1] = endian_reverse64(sha->msg_digest[1]);
sha->msg_digest[2] = endian_reverse64(sha->msg_digest[2]);
sha->msg_digest[3] =
endian_reverse64(sha->msg_digest[3] &= 0xffffffff00000000);
sha->msg_digest[4] = 0;
sha->msg_digest[5] = 0;
sha->msg_digest[6] = 0;
sha->msg_digest[7] = 0;
}
return 1;
}