27822ce67f
This patch defines _STRING_ARCH_unaligned to 0 on default bits/string.h header to avoid undefined compiler warnings on platforms that do not define it. It also make adjustments in code where tests checked if macro existed or not.
222 lines
6.3 KiB
C
222 lines
6.3 KiB
C
/* Functions to compute SHA256 message digest of files or memory blocks.
|
|
according to the definition of SHA256 in FIPS 180-2.
|
|
Copyright (C) 2007-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* Written by Ulrich Drepper <drepper@redhat.com>, 2007. */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <endian.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
|
|
#include "sha256.h"
|
|
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
# ifdef _LIBC
|
|
# include <byteswap.h>
|
|
# define SWAP(n) bswap_32 (n)
|
|
# define SWAP64(n) bswap_64 (n)
|
|
# else
|
|
# define SWAP(n) \
|
|
(((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
|
|
# define SWAP64(n) \
|
|
(((n) << 56) \
|
|
| (((n) & 0xff00) << 40) \
|
|
| (((n) & 0xff0000) << 24) \
|
|
| (((n) & 0xff000000) << 8) \
|
|
| (((n) >> 8) & 0xff000000) \
|
|
| (((n) >> 24) & 0xff0000) \
|
|
| (((n) >> 40) & 0xff00) \
|
|
| ((n) >> 56))
|
|
# endif
|
|
#else
|
|
# define SWAP(n) (n)
|
|
# define SWAP64(n) (n)
|
|
#endif
|
|
|
|
|
|
/* This array contains the bytes used to pad the buffer to the next
|
|
64-byte boundary. (FIPS 180-2:5.1.1) */
|
|
static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
|
|
|
|
|
|
/* Constants for SHA256 from FIPS 180-2:4.2.2. */
|
|
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
|
|
};
|
|
|
|
void
|
|
sha256_process_block (const void *, size_t, struct sha256_ctx *);
|
|
|
|
/* Initialize structure containing state of computation.
|
|
(FIPS 180-2:5.3.2) */
|
|
void
|
|
__sha256_init_ctx (ctx)
|
|
struct sha256_ctx *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;
|
|
|
|
ctx->total64 = 0;
|
|
ctx->buflen = 0;
|
|
}
|
|
|
|
|
|
/* Process the remaining bytes in the internal buffer and the usual
|
|
prolog according to the standard and write the result to RESBUF.
|
|
|
|
IMPORTANT: On some systems it is required that RESBUF is correctly
|
|
aligned for a 32 bits value. */
|
|
void *
|
|
__sha256_finish_ctx (ctx, resbuf)
|
|
struct sha256_ctx *ctx;
|
|
void *resbuf;
|
|
{
|
|
/* Take yet unprocessed bytes into account. */
|
|
uint32_t bytes = ctx->buflen;
|
|
size_t pad;
|
|
|
|
/* Now count remaining bytes. */
|
|
ctx->total64 += bytes;
|
|
|
|
pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
|
|
memcpy (&ctx->buffer[bytes], fillbuf, pad);
|
|
|
|
/* Put the 64-bit file length in *bits* at the end of the buffer. */
|
|
#if _STRING_ARCH_unaligned
|
|
ctx->buffer64[(bytes + pad) / 8] = SWAP64 (ctx->total64 << 3);
|
|
#else
|
|
ctx->buffer32[(bytes + pad + 4) / 4] = SWAP (ctx->total[TOTAL64_low] << 3);
|
|
ctx->buffer32[(bytes + pad) / 4] = SWAP ((ctx->total[TOTAL64_high] << 3) |
|
|
(ctx->total[TOTAL64_low] >> 29));
|
|
#endif
|
|
|
|
/* Process last bytes. */
|
|
sha256_process_block (ctx->buffer, bytes + pad + 8, ctx);
|
|
|
|
/* Put result from CTX in first 32 bytes following RESBUF. */
|
|
for (unsigned int i = 0; i < 8; ++i)
|
|
((uint32_t *) resbuf)[i] = SWAP (ctx->H[i]);
|
|
|
|
return resbuf;
|
|
}
|
|
|
|
|
|
void
|
|
__sha256_process_bytes (buffer, len, ctx)
|
|
const void *buffer;
|
|
size_t len;
|
|
struct sha256_ctx *ctx;
|
|
{
|
|
/* When we already have some bits in our internal buffer concatenate
|
|
both inputs first. */
|
|
if (ctx->buflen != 0)
|
|
{
|
|
size_t left_over = ctx->buflen;
|
|
size_t add = 128 - left_over > len ? len : 128 - left_over;
|
|
|
|
memcpy (&ctx->buffer[left_over], buffer, add);
|
|
ctx->buflen += add;
|
|
|
|
if (ctx->buflen > 64)
|
|
{
|
|
sha256_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
|
|
|
|
ctx->buflen &= 63;
|
|
/* The regions in the following copy operation cannot overlap. */
|
|
memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
|
|
ctx->buflen);
|
|
}
|
|
|
|
buffer = (const char *) buffer + add;
|
|
len -= add;
|
|
}
|
|
|
|
/* Process available complete blocks. */
|
|
if (len >= 64)
|
|
{
|
|
#if !_STRING_ARCH_unaligned
|
|
/* To check alignment gcc has an appropriate operator. Other
|
|
compilers don't. */
|
|
# if __GNUC__ >= 2
|
|
# define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint32_t) != 0)
|
|
# else
|
|
# define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (uint32_t) != 0)
|
|
# endif
|
|
if (UNALIGNED_P (buffer))
|
|
while (len > 64)
|
|
{
|
|
sha256_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
|
|
buffer = (const char *) buffer + 64;
|
|
len -= 64;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
sha256_process_block (buffer, len & ~63, ctx);
|
|
buffer = (const char *) buffer + (len & ~63);
|
|
len &= 63;
|
|
}
|
|
}
|
|
|
|
/* Move remaining bytes into internal buffer. */
|
|
if (len > 0)
|
|
{
|
|
size_t left_over = ctx->buflen;
|
|
|
|
memcpy (&ctx->buffer[left_over], buffer, len);
|
|
left_over += len;
|
|
if (left_over >= 64)
|
|
{
|
|
sha256_process_block (ctx->buffer, 64, ctx);
|
|
left_over -= 64;
|
|
memcpy (ctx->buffer, &ctx->buffer[64], left_over);
|
|
}
|
|
ctx->buflen = left_over;
|
|
}
|
|
}
|
|
|
|
#include <sha256-block.c>
|