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/*
* Copyright (C) 2006-2009 Vincent Hanquez <vincent@snarc.org>
*
* 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 AUTHOR ``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 AUTHOR 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 <string.h>
#include "sha256.h"
#include "bitfn.h"
void sha224_init(struct sha224_ctx *ctx)
{
memset(ctx, 0, sizeof(*ctx));
ctx->h[0] = 0xc1059ed8;
ctx->h[1] = 0x367cd507;
ctx->h[2] = 0x3070dd17;
ctx->h[3] = 0xf70e5939;
ctx->h[4] = 0xffc00b31;
ctx->h[5] = 0x68581511;
ctx->h[6] = 0x64f98fa7;
ctx->h[7] = 0xbefa4fa4;
}
void sha256_init(struct sha256_ctx *ctx)
{
memset(ctx, 0, sizeof(*ctx));
ctx->h[0] = 0x6a09e667;
ctx->h[1] = 0xbb67ae85;
ctx->h[2] = 0x3c6ef372;
ctx->h[3] = 0xa54ff53a;
ctx->h[4] = 0x510e527f;
ctx->h[5] = 0x9b05688c;
ctx->h[6] = 0x1f83d9ab;
ctx->h[7] = 0x5be0cd19;
}
/* 232 times the cube root of the first 64 primes 2..311 */
static const uint32_t k[] = {
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
};
#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
static void sha256_do_chunk(struct sha256_ctx *ctx, uint32_t buf[])
{
uint32_t a, b, c, d, e, f, g, h, t1, t2;
int i;
uint32_t w[64];
cpu_to_be32_array(w, buf, 16);
for (i = 16; i < 64; i++)
w[i] = s1(w[i - 2]) + w[i - 7] + s0(w[i - 15]) + w[i - 16];
a = ctx->h[0]; b = ctx->h[1]; c = ctx->h[2]; d = ctx->h[3];
e = ctx->h[4]; f = ctx->h[5]; g = ctx->h[6]; h = ctx->h[7];
#define R(a, b, c, d, e, f, g, h, k, w) \
t1 = h + e1(e) + (g ^ (e & (f ^ g))) + k + w; \
t2 = e0(a) + ((a & b) | (c & (a | b))); \
d += t1; \
h = t1 + t2;
for (i = 0; i < 64; i += 8) {
R(a, b, c, d, e, f, g, h, k[i + 0], w[i + 0]);
R(h, a, b, c, d, e, f, g, k[i + 1], w[i + 1]);
R(g, h, a, b, c, d, e, f, k[i + 2], w[i + 2]);
R(f, g, h, a, b, c, d, e, k[i + 3], w[i + 3]);
R(e, f, g, h, a, b, c, d, k[i + 4], w[i + 4]);
R(d, e, f, g, h, a, b, c, k[i + 5], w[i + 5]);
R(c, d, e, f, g, h, a, b, k[i + 6], w[i + 6]);
R(b, c, d, e, f, g, h, a, k[i + 7], w[i + 7]);
}
#undef R
ctx->h[0] += a; ctx->h[1] += b; ctx->h[2] += c; ctx->h[3] += d;
ctx->h[4] += e; ctx->h[5] += f; ctx->h[6] += g; ctx->h[7] += h;
}
void sha224_update(struct sha224_ctx *ctx, uint8_t *data, uint32_t len)
{
return sha256_update(ctx, data, len);
}
void sha256_update(struct sha256_ctx *ctx, uint8_t *data, uint32_t len)
{
uint32_t index, to_fill;
/* check for partial buffer */
index = (uint32_t) (ctx->sz & 0x3f);
to_fill = 64 - index;
ctx->sz += len;
/* process partial buffer if there's enough data to make a block */
if (index && len >= to_fill) {
memcpy(ctx->buf + index, data, to_fill);
sha256_do_chunk(ctx, (uint32_t *) ctx->buf);
len -= to_fill;
data += to_fill;
index = 0;
}
/* process as much 64-block as possible */
for (; len >= 64; len -= 64, data += 64)
sha256_do_chunk(ctx, (uint32_t *) data);
/* append data into buf */
if (len)
memcpy(ctx->buf + index, data, len);
}
void sha224_finalize(struct sha224_ctx *ctx, uint8_t *out)
{
uint8_t intermediate[SHA256_DIGEST_SIZE];
sha256_finalize(ctx, intermediate);
memcpy(out, intermediate, SHA224_DIGEST_SIZE);
}
void sha256_finalize(struct sha256_ctx *ctx, uint8_t *out)
{
static uint8_t padding[64] = { 0x80, };
uint64_t bits;
uint32_t i, index, padlen;
uint32_t *p = (uint32_t *) out;
/* cpu -> big endian */
bits = cpu_to_be64(ctx->sz << 3);
/* pad out to 56 */
index = (uint32_t) (ctx->sz & 0x3f);
padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
sha256_update(ctx, padding, padlen);
/* append length */
sha256_update(ctx, (uint8_t *) &bits, sizeof(bits));
/* store to digest */
for (i = 0; i < 8; i++)
p[i] = cpu_to_be32(ctx->h[i]);
}
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