+++ /dev/null
-/* sha1.c - Functions to compute SHA1 message digest of files or
- memory blocks according to the NIST specification FIPS-180-1.
-
- Copyright (C) 2007 Free Software Foundation, Inc.
-
- This file is part of the GNU Binutils.
-
- This program is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 3, or (at your option) any
- later version.
-
- This program 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 a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-
-/* Written by Scott G. Miller
- Credits:
- Robert Klep <robert@ilse.nl> -- Expansion function fix */
-
-#include <config.h>
-#include "sha1.h"
-#include <stddef.h>
-#include <string.h>
-
-#if USE_UNLOCKED_IO
-# include "unlocked-io.h"
-#endif
-
-#ifdef WORDS_BIGENDIAN
-# define SWAP(n) (n)
-#else
-# define SWAP(n) \
- (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
-#endif
-
-#define BLOCKSIZE 4096
-#if BLOCKSIZE % 64 != 0
-# error "invalid BLOCKSIZE"
-#endif
-
-/* This array contains the bytes used to pad the buffer to the next
- 64-byte boundary. (RFC 1321, 3.1: Step 1) */
-static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
-
-
-/* Take a pointer to a 160 bit block of data (five 32 bit ints) and
- initialize it to the start constants of the SHA1 algorithm. This
- must be called before using hash in the call to sha1_hash. */
-
-void
-sha1_init_ctx (struct sha1_ctx *ctx)
-{
- ctx->A = 0x67452301;
- ctx->B = 0xefcdab89;
- ctx->C = 0x98badcfe;
- ctx->D = 0x10325476;
- ctx->E = 0xc3d2e1f0;
-
- ctx->total[0] = ctx->total[1] = 0;
- ctx->buflen = 0;
-}
-
-/* Put result from CTX in first 20 bytes following RESBUF. The result
- must be in little endian byte order.
-
- IMPORTANT: On some systems it is required that RESBUF is correctly
- aligned for a 32-bit value. */
-
-void *
-sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf)
-{
- ((uint32_t *) resbuf)[0] = SWAP (ctx->A);
- ((uint32_t *) resbuf)[1] = SWAP (ctx->B);
- ((uint32_t *) resbuf)[2] = SWAP (ctx->C);
- ((uint32_t *) resbuf)[3] = SWAP (ctx->D);
- ((uint32_t *) resbuf)[4] = SWAP (ctx->E);
-
- return resbuf;
-}
-
-/* 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-bit value. */
-
-void *
-sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf)
-{
- /* Take yet unprocessed bytes into account. */
- uint32_t bytes = ctx->buflen;
- size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;
-
- /* Now count remaining bytes. */
- ctx->total[0] += bytes;
- if (ctx->total[0] < bytes)
- ++ctx->total[1];
-
- /* Put the 64-bit file length in *bits* at the end of the buffer. */
- ctx->buffer[size - 2] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
- ctx->buffer[size - 1] = SWAP (ctx->total[0] << 3);
-
- memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
-
- /* Process last bytes. */
- sha1_process_block (ctx->buffer, size * 4, ctx);
-
- return sha1_read_ctx (ctx, resbuf);
-}
-
-/* Compute SHA1 message digest for bytes read from STREAM. The
- resulting message digest number will be written into the 16 bytes
- beginning at RESBLOCK. */
-
-int
-sha1_stream (FILE *stream, void *resblock)
-{
- struct sha1_ctx ctx;
- char buffer[BLOCKSIZE + 72];
- size_t sum;
-
- /* Initialize the computation context. */
- sha1_init_ctx (&ctx);
-
- /* Iterate over full file contents. */
- while (1)
- {
- /* We read the file in blocks of BLOCKSIZE bytes. One call of the
- computation function processes the whole buffer so that with the
- next round of the loop another block can be read. */
- size_t n;
- sum = 0;
-
- /* Read block. Take care for partial reads. */
- while (1)
- {
- n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
-
- sum += n;
-
- if (sum == BLOCKSIZE)
- break;
-
- if (n == 0)
- {
- /* Check for the error flag IFF N == 0, so that we don't
- exit the loop after a partial read due to e.g., EAGAIN
- or EWOULDBLOCK. */
- if (ferror (stream))
- return 1;
- goto process_partial_block;
- }
-
- /* We've read at least one byte, so ignore errors. But always
- check for EOF, since feof may be true even though N > 0.
- Otherwise, we could end up calling fread after EOF. */
- if (feof (stream))
- goto process_partial_block;
- }
-
- /* Process buffer with BLOCKSIZE bytes. Note that
- BLOCKSIZE % 64 == 0. */
- sha1_process_block (buffer, BLOCKSIZE, &ctx);
- }
-
- process_partial_block:;
-
- /* Process any remaining bytes. */
- if (sum > 0)
- sha1_process_bytes (buffer, sum, &ctx);
-
- /* Construct result in desired memory. */
- sha1_finish_ctx (&ctx, resblock);
- return 0;
-}
-
-/* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
- result is always in little endian byte order, so that a byte-wise
- output yields to the wanted ASCII representation of the message
- digest. */
-
-void *
-sha1_buffer (const char *buffer, size_t len, void *resblock)
-{
- struct sha1_ctx ctx;
-
- /* Initialize the computation context. */
- sha1_init_ctx (&ctx);
-
- /* Process whole buffer but last len % 64 bytes. */
- sha1_process_bytes (buffer, len, &ctx);
-
- /* Put result in desired memory area. */
- return sha1_finish_ctx (&ctx, resblock);
-}
-
-void
-sha1_process_bytes (const void *buffer, size_t len, struct sha1_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 (&((char *) ctx->buffer)[left_over], buffer, add);
- ctx->buflen += add;
-
- if (ctx->buflen > 64)
- {
- sha1_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
-
- ctx->buflen &= 63;
- /* The regions in the following copy operation cannot overlap. */
- memcpy (ctx->buffer,
- &((char *) 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
-# define alignof(type) offsetof (struct { char c; type x; }, x)
-# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
- if (UNALIGNED_P (buffer))
- while (len > 64)
- {
- sha1_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
- buffer = (const char *) buffer + 64;
- len -= 64;
- }
- else
-#endif
- {
- sha1_process_block (buffer, len & ~63, ctx);
- buffer = (const char *) buffer + (len & ~63);
- len &= 63;
- }
- }
-
- /* Move remaining bytes in internal buffer. */
- if (len > 0)
- {
- size_t left_over = ctx->buflen;
-
- memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
- left_over += len;
- if (left_over >= 64)
- {
- sha1_process_block (ctx->buffer, 64, ctx);
- left_over -= 64;
- memcpy (ctx->buffer, &ctx->buffer[16], left_over);
- }
- ctx->buflen = left_over;
- }
-}
-
-/* --- Code below is the primary difference between md5.c and sha1.c --- */
-
-/* SHA1 round constants. */
-#define K1 0x5a827999
-#define K2 0x6ed9eba1
-#define K3 0x8f1bbcdc
-#define K4 0xca62c1d6
-
-/* Round functions. Note that F2 is the same as F4. */
-#define F1(B,C,D) (D ^ (B & (C ^ D)))
-#define F2(B,C,D) (B ^ C ^ D)
-#define F3(B,C,D) ((B & C) | (D & (B | C)))
-#define F4(B,C,D) (B ^ C ^ D)
-
-/* Process LEN bytes of BUFFER, accumulating context into CTX.
- It is assumed that LEN % 64 == 0.
- Most of this code comes from GnuPG's cipher/sha1.c. */
-
-void
-sha1_process_block (const void *buffer, size_t len, struct sha1_ctx *ctx)
-{
- const uint32_t *words = buffer;
- size_t nwords = len / sizeof (uint32_t);
- const uint32_t *endp = words + nwords;
- uint32_t x[16];
- uint32_t a = ctx->A;
- uint32_t b = ctx->B;
- uint32_t c = ctx->C;
- uint32_t d = ctx->D;
- uint32_t e = ctx->E;
-
- /* First increment the byte count. RFC 1321 specifies the possible
- length of the file up to 2^64 bits. Here we only compute the
- number of bytes. Do a double word increment. */
- ctx->total[0] += len;
- if (ctx->total[0] < len)
- ++ctx->total[1];
-
-#define rol(x, n) (((x) << (n)) | ((uint32_t) (x) >> (32 - (n))))
-
-#define M(I) (tm = x[I & 0x0f] ^ x[(I - 14) & 0x0f] \
- ^ x[(I - 8) & 0x0f] ^ x[(I - 3) & 0x0f] \
- , (x[I & 0x0f] = rol (tm, 1)))
-
-#define R(A,B,C,D,E,F,K,M) \
- do \
- { \
- E += rol (A, 5) \
- + F (B, C, D) \
- + K \
- + M; \
- B = rol (B, 30); \
- } \
- while (0)
-
- while (words < endp)
- {
- uint32_t tm;
- int t;
-
- for (t = 0; t < 16; t++)
- {
- x[t] = SWAP (*words);
- words++;
- }
-
- R (a, b, c, d, e, F1, K1, x[ 0]);
- R (e, a, b, c, d, F1, K1, x[ 1]);
- R (d, e, a, b, c, F1, K1, x[ 2]);
- R (c, d, e, a, b, F1, K1, x[ 3]);
- R (b, c, d, e, a, F1, K1, x[ 4]);
- R (a, b, c, d, e, F1, K1, x[ 5]);
- R (e, a, b, c, d, F1, K1, x[ 6]);
- R (d, e, a, b, c, F1, K1, x[ 7]);
- R (c, d, e, a, b, F1, K1, x[ 8]);
- R (b, c, d, e, a, F1, K1, x[ 9]);
- R (a, b, c, d, e, F1, K1, x[10]);
- R (e, a, b, c, d, F1, K1, x[11]);
- R (d, e, a, b, c, F1, K1, x[12]);
- R (c, d, e, a, b, F1, K1, x[13]);
- R (b, c, d, e, a, F1, K1, x[14]);
- R (a, b, c, d, e, F1, K1, x[15]);
- R (e, a, b, c, d, F1, K1, M(16));
- R (d, e, a, b, c, F1, K1, M(17));
- R (c, d, e, a, b, F1, K1, M(18));
- R (b, c, d, e, a, F1, K1, M(19));
- R (a, b, c, d, e, F2, K2, M(20));
- R (e, a, b, c, d, F2, K2, M(21));
- R (d, e, a, b, c, F2, K2, M(22));
- R (c, d, e, a, b, F2, K2, M(23));
- R (b, c, d, e, a, F2, K2, M(24));
- R (a, b, c, d, e, F2, K2, M(25));
- R (e, a, b, c, d, F2, K2, M(26));
- R (d, e, a, b, c, F2, K2, M(27));
- R (c, d, e, a, b, F2, K2, M(28));
- R (b, c, d, e, a, F2, K2, M(29));
- R (a, b, c, d, e, F2, K2, M(30));
- R (e, a, b, c, d, F2, K2, M(31));
- R (d, e, a, b, c, F2, K2, M(32));
- R (c, d, e, a, b, F2, K2, M(33));
- R (b, c, d, e, a, F2, K2, M(34));
- R (a, b, c, d, e, F2, K2, M(35));
- R (e, a, b, c, d, F2, K2, M(36));
- R (d, e, a, b, c, F2, K2, M(37));
- R (c, d, e, a, b, F2, K2, M(38));
- R (b, c, d, e, a, F2, K2, M(39));
- R (a, b, c, d, e, F3, K3, M(40));
- R (e, a, b, c, d, F3, K3, M(41));
- R (d, e, a, b, c, F3, K3, M(42));
- R (c, d, e, a, b, F3, K3, M(43));
- R (b, c, d, e, a, F3, K3, M(44));
- R (a, b, c, d, e, F3, K3, M(45));
- R (e, a, b, c, d, F3, K3, M(46));
- R (d, e, a, b, c, F3, K3, M(47));
- R (c, d, e, a, b, F3, K3, M(48));
- R (b, c, d, e, a, F3, K3, M(49));
- R (a, b, c, d, e, F3, K3, M(50));
- R (e, a, b, c, d, F3, K3, M(51));
- R (d, e, a, b, c, F3, K3, M(52));
- R (c, d, e, a, b, F3, K3, M(53));
- R (b, c, d, e, a, F3, K3, M(54));
- R (a, b, c, d, e, F3, K3, M(55));
- R (e, a, b, c, d, F3, K3, M(56));
- R (d, e, a, b, c, F3, K3, M(57));
- R (c, d, e, a, b, F3, K3, M(58));
- R (b, c, d, e, a, F3, K3, M(59));
- R (a, b, c, d, e, F4, K4, M(60));
- R (e, a, b, c, d, F4, K4, M(61));
- R (d, e, a, b, c, F4, K4, M(62));
- R (c, d, e, a, b, F4, K4, M(63));
- R (b, c, d, e, a, F4, K4, M(64));
- R (a, b, c, d, e, F4, K4, M(65));
- R (e, a, b, c, d, F4, K4, M(66));
- R (d, e, a, b, c, F4, K4, M(67));
- R (c, d, e, a, b, F4, K4, M(68));
- R (b, c, d, e, a, F4, K4, M(69));
- R (a, b, c, d, e, F4, K4, M(70));
- R (e, a, b, c, d, F4, K4, M(71));
- R (d, e, a, b, c, F4, K4, M(72));
- R (c, d, e, a, b, F4, K4, M(73));
- R (b, c, d, e, a, F4, K4, M(74));
- R (a, b, c, d, e, F4, K4, M(75));
- R (e, a, b, c, d, F4, K4, M(76));
- R (d, e, a, b, c, F4, K4, M(77));
- R (c, d, e, a, b, F4, K4, M(78));
- R (b, c, d, e, a, F4, K4, M(79));
-
- a = ctx->A += a;
- b = ctx->B += b;
- c = ctx->C += c;
- d = ctx->D += d;
- e = ctx->E += e;
- }
-}
projects / binutils-gdb.git / commitdiff