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/* sha256.c
The sha256 hash function.
See http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
Copyright (C) 2001 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
/* Modelled after the sha1.c code by Peter Gutmann. */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "sha2.h"
#include "macros.h"
#include "nettle-write.h"
/* Generated by the shadata program. */
static const uint32_t
K[64] =
{
0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL,
};
#define COMPRESS(ctx, data) (_nettle_sha256_compress((ctx)->state, (data), K))
/* Initialize the SHA values */
void
sha256_init(struct sha256_ctx *ctx)
{
/* Initial values, also generated by the shadata program. */
static const uint32_t H0[_SHA256_DIGEST_LENGTH] =
{
0x6a09e667UL, 0xbb67ae85UL, 0x3c6ef372UL, 0xa54ff53aUL,
0x510e527fUL, 0x9b05688cUL, 0x1f83d9abUL, 0x5be0cd19UL,
};
memcpy(ctx->state, H0, sizeof(H0));
/* Initialize bit count */
ctx->count = 0;
/* Initialize buffer */
ctx->index = 0;
}
void
sha256_update(struct sha256_ctx *ctx,
size_t length, const uint8_t *data)
{
MD_UPDATE (ctx, length, data, COMPRESS, ctx->count++);
}
static void
sha256_write_digest(struct sha256_ctx *ctx,
size_t length,
uint8_t *digest)
{
uint64_t bit_count;
assert(length <= SHA256_DIGEST_SIZE);
MD_PAD(ctx, 8, COMPRESS);
/* There are 512 = 2^9 bits in one block */
bit_count = (ctx->count << 9) | (ctx->index << 3);
/* This is slightly inefficient, as the numbers are converted to
big-endian format, and will be converted back by the compression
function. It's probably not worth the effort to fix this. */
WRITE_UINT64(ctx->block + (SHA256_BLOCK_SIZE - 8), bit_count);
COMPRESS(ctx, ctx->block);
_nettle_write_be32(length, digest, ctx->state);
}
void
sha256_digest(struct sha256_ctx *ctx,
size_t length,
uint8_t *digest)
{
sha256_write_digest(ctx, length, digest);
sha256_init(ctx);
}
/* sha224 variant. */
void
sha224_init(struct sha256_ctx *ctx)
{
/* Initial values. Low 32 bits of the initial values for sha384. */
static const uint32_t H0[_SHA256_DIGEST_LENGTH] =
{
0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4,
};
memcpy(ctx->state, H0, sizeof(H0));
/* Initialize bit count */
ctx->count = 0;
/* Initialize buffer */
ctx->index = 0;
}
void
sha224_digest(struct sha256_ctx *ctx,
size_t length,
uint8_t *digest)
{
sha256_write_digest(ctx, length, digest);
sha224_init(ctx);
}
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