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/*
Copyright (c) 2012-2013, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "sha256.h"
#include <stdarg.h>
#include <string.h>
#include <arpa/inet.h>
static inline uint32_t rotr(uint32_t x, int r) {
return (x >> r) | (x << (32-r));
}
static void sha256_blocks_va(uint32_t out[FASTD_SHA256_HASH_WORDS], const uint32_t *in1, const uint32_t *in2, va_list ap) {
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
};
uint32_t h[8] = {
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19
};
unsigned count = in2 ? 2 : in1 ? 1 : 0, i;
while (true) {
uint32_t w[64], v[8];
if (in1) {
for (i = 0; i < 8; i++)
w[i] = ntohl(in1[i]);
}
else {
w[0] = 0x80000000;
memset(w+1, 0, 7*sizeof(uint32_t));
}
if (in2) {
for (i = 0; i < 8; i++)
w[i+8] = ntohl(in2[i]);
}
else {
w[8] = in1 ? 0x80000000 : 0;
memset(w+9, 0, 6*sizeof(uint32_t));
w[15] = count << 8;
}
for (i = 16; i < 64; i++) {
uint32_t s0 = rotr(w[i-15], 7) ^ rotr(w[i-15], 18) ^ (w[i-15] >> 3);
uint32_t s1 = rotr(w[i-2], 17) ^ rotr(w[i-2], 19) ^ (w[i-2] >> 10);
w[i] = w[i-16] + s0 + w[i-7] + s1;
}
memcpy(v, h, sizeof(v));
for (i = 0; i < 64; i++) {
uint32_t s1 = rotr(v[4], 6) ^ rotr(v[4], 11) ^ rotr(v[4], 25);
uint32_t ch = (v[4] & v[5]) ^ ((~v[4]) & v[6]);
uint32_t temp1 = v[7] + s1 + ch + k[i] + w[i];
uint32_t s0 = rotr(v[0], 2) ^ rotr(v[0], 13) ^ rotr(v[0], 22);
uint32_t maj = (v[0] & v[1]) ^ (v[0] & v[2]) ^ (v[1] & v[2]);
uint32_t temp2 = s0 + maj;
v[7] = v[6];
v[6] = v[5];
v[5] = v[4];
v[4] = v[3] + temp1;
v[3] = v[2];
v[2] = v[1];
v[1] = v[0];
v[0] = temp1 + temp2;
}
for (i = 0; i < 8; i++)
h[i] += v[i];
if (!in2)
break;
in1 = va_arg(ap, const uint32_t*);
if (in1) {
count++;
in2 = va_arg(ap, const uint32_t*);
if (in2)
count++;
}
else {
in2 = NULL;
}
}
for (i = 0; i < 8; i++)
out[i] = htonl(h[i]);
}
static void hmacsha256_blocks_va(fastd_sha256_t *out, const uint32_t key[FASTD_HMACSHA256_KEY_WORDS], va_list ap) {
static const uint32_t ipad2[8] = {
0x36363636,
0x36363636,
0x36363636,
0x36363636,
0x36363636,
0x36363636,
0x36363636,
0x36363636
};
static const uint32_t opad2[8] = {
0x5c5c5c5c,
0x5c5c5c5c,
0x5c5c5c5c,
0x5c5c5c5c,
0x5c5c5c5c,
0x5c5c5c5c,
0x5c5c5c5c,
0x5c5c5c5c
};
uint32_t ipad[8], opad[8];
unsigned i;
for (i = 0; i < 8; i++) {
ipad[i] = key[i] ^ 0x36363636;
opad[i] = key[i] ^ 0x5c5c5c5c;
}
uint32_t temp[8];
sha256_blocks_va(temp, ipad, ipad2, ap);
fastd_sha256_blocks(out, opad, opad2, temp, NULL);
}
void fastd_sha256_blocks(fastd_sha256_t *out, ...) {
va_list ap;
va_start(ap, out);
const uint32_t *in1 = va_arg(ap, const uint32_t*);
const uint32_t *in2 = in1 ? va_arg(ap, const uint32_t*) : NULL;
sha256_blocks_va(out->w, in1, in2, ap);
va_end(ap);
}
void fastd_hmacsha256_blocks(fastd_sha256_t *out, const uint32_t key[FASTD_HMACSHA256_KEY_WORDS], ...) {
va_list ap;
va_start(ap, key);
hmacsha256_blocks_va(out, key, ap);
va_end(ap);
}
bool fastd_hmacsha256_blocks_verify(const uint8_t mac[FASTD_SHA256_HASH_BYTES], const uint32_t key[FASTD_HMACSHA256_KEY_WORDS], ...) {
va_list ap;
fastd_sha256_t out;
va_start(ap, key);
hmacsha256_blocks_va(&out, key, ap);
va_end(ap);
return !memcmp(out.b, mac, FASTD_SHA256_HASH_BYTES);
}
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