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jlechner |
/* sha1.c - Functions to compute SHA1 message digest of files or
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memory blocks according to the NIST specification FIPS-180-1.
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Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2008 Free Software
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Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by Scott G. Miller
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Credits:
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Robert Klep <robert@ilse.nl> -- Expansion function fix
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*/
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#include <config.h>
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#include "sha1.h"
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#include <stddef.h>
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#include <string.h>
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#if USE_UNLOCKED_IO
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# include "unlocked-io.h"
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#endif
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#ifdef WORDS_BIGENDIAN
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# define SWAP(n) (n)
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#else
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# define SWAP(n) \
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(((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
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#endif
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#define BLOCKSIZE 4096
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#if BLOCKSIZE % 64 != 0
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# error "invalid BLOCKSIZE"
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#endif
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/* This array contains the bytes used to pad the buffer to the next
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64-byte boundary. (RFC 1321, 3.1: Step 1) */
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static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
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53 |
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/* Take a pointer to a 160 bit block of data (five 32 bit ints) and
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initialize it to the start constants of the SHA1 algorithm. This
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must be called before using hash in the call to sha1_hash. */
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void
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sha1_init_ctx (struct sha1_ctx *ctx)
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{
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ctx->A = 0x67452301;
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ctx->B = 0xefcdab89;
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ctx->C = 0x98badcfe;
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ctx->D = 0x10325476;
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ctx->E = 0xc3d2e1f0;
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ctx->total[0] = ctx->total[1] = 0;
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ctx->buflen = 0;
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}
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/* Put result from CTX in first 20 bytes following RESBUF. The result
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must be in little endian byte order.
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IMPORTANT: On some systems it is required that RESBUF is correctly
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aligned for a 32-bit value. */
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void *
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sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf)
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{
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((sha1_uint32 *) resbuf)[0] = SWAP (ctx->A);
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((sha1_uint32 *) resbuf)[1] = SWAP (ctx->B);
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((sha1_uint32 *) resbuf)[2] = SWAP (ctx->C);
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((sha1_uint32 *) resbuf)[3] = SWAP (ctx->D);
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((sha1_uint32 *) resbuf)[4] = SWAP (ctx->E);
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return resbuf;
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}
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/* Process the remaining bytes in the internal buffer and the usual
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prolog according to the standard and write the result to RESBUF.
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IMPORTANT: On some systems it is required that RESBUF is correctly
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aligned for a 32-bit value. */
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void *
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sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf)
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{
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/* Take yet unprocessed bytes into account. */
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sha1_uint32 bytes = ctx->buflen;
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size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;
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/* Now count remaining bytes. */
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ctx->total[0] += bytes;
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if (ctx->total[0] < bytes)
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++ctx->total[1];
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/* Put the 64-bit file length in *bits* at the end of the buffer. */
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ctx->buffer[size - 2] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
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ctx->buffer[size - 1] = SWAP (ctx->total[0] << 3);
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memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
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/* Process last bytes. */
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sha1_process_block (ctx->buffer, size * 4, ctx);
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return sha1_read_ctx (ctx, resbuf);
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}
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/* Compute SHA1 message digest for bytes read from STREAM. The
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resulting message digest number will be written into the 16 bytes
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beginning at RESBLOCK. */
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int
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sha1_stream (FILE *stream, void *resblock)
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{
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struct sha1_ctx ctx;
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char buffer[BLOCKSIZE + 72];
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size_t sum;
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/* Initialize the computation context. */
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sha1_init_ctx (&ctx);
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/* Iterate over full file contents. */
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while (1)
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{
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/* We read the file in blocks of BLOCKSIZE bytes. One call of the
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computation function processes the whole buffer so that with the
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next round of the loop another block can be read. */
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size_t n;
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sum = 0;
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/* Read block. Take care for partial reads. */
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while (1)
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{
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n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
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sum += n;
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if (sum == BLOCKSIZE)
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break;
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if (n == 0)
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{
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/* Check for the error flag IFF N == 0, so that we don't
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exit the loop after a partial read due to e.g., EAGAIN
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or EWOULDBLOCK. */
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if (ferror (stream))
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return 1;
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goto process_partial_block;
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}
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/* We've read at least one byte, so ignore errors. But always
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check for EOF, since feof may be true even though N > 0.
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Otherwise, we could end up calling fread after EOF. */
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if (feof (stream))
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goto process_partial_block;
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}
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/* Process buffer with BLOCKSIZE bytes. Note that
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BLOCKSIZE % 64 == 0
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*/
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sha1_process_block (buffer, BLOCKSIZE, &ctx);
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}
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process_partial_block:;
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/* Process any remaining bytes. */
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if (sum > 0)
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sha1_process_bytes (buffer, sum, &ctx);
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/* Construct result in desired memory. */
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sha1_finish_ctx (&ctx, resblock);
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return 0;
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}
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/* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
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result is always in little endian byte order, so that a byte-wise
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output yields to the wanted ASCII representation of the message
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digest. */
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void *
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sha1_buffer (const char *buffer, size_t len, void *resblock)
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{
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struct sha1_ctx ctx;
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/* Initialize the computation context. */
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sha1_init_ctx (&ctx);
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/* Process whole buffer but last len % 64 bytes. */
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sha1_process_bytes (buffer, len, &ctx);
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/* Put result in desired memory area. */
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return sha1_finish_ctx (&ctx, resblock);
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}
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void
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sha1_process_bytes (const void *buffer, size_t len, struct sha1_ctx *ctx)
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{
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/* When we already have some bits in our internal buffer concatenate
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both inputs first. */
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if (ctx->buflen != 0)
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{
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208 |
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size_t left_over = ctx->buflen;
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size_t add = 128 - left_over > len ? len : 128 - left_over;
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memcpy (&((char *) ctx->buffer)[left_over], buffer, add);
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ctx->buflen += add;
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if (ctx->buflen > 64)
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{
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216 |
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sha1_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
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ctx->buflen &= 63;
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/* The regions in the following copy operation cannot overlap. */
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220 |
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memcpy (ctx->buffer,
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&((char *) ctx->buffer)[(left_over + add) & ~63],
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ctx->buflen);
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223 |
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}
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224 |
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buffer = (const char *) buffer + add;
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len -= add;
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}
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228 |
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229 |
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/* Process available complete blocks. */
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230 |
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if (len >= 64)
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{
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232 |
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#if !_STRING_ARCH_unaligned
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233 |
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# define alignof(type) offsetof (struct { char c; type x; }, x)
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# define UNALIGNED_P(p) (((size_t) p) % alignof (sha1_uint32) != 0)
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if (UNALIGNED_P (buffer))
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while (len > 64)
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{
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238 |
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sha1_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
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buffer = (const char *) buffer + 64;
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len -= 64;
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241 |
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}
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242 |
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else
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#endif
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244 |
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{
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245 |
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sha1_process_block (buffer, len & ~63, ctx);
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buffer = (const char *) buffer + (len & ~63);
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247 |
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len &= 63;
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248 |
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}
|
249 |
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}
|
250 |
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|
251 |
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/* Move remaining bytes in internal buffer. */
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252 |
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if (len > 0)
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253 |
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{
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254 |
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size_t left_over = ctx->buflen;
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255 |
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256 |
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memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
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257 |
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left_over += len;
|
258 |
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if (left_over >= 64)
|
259 |
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{
|
260 |
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sha1_process_block (ctx->buffer, 64, ctx);
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261 |
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left_over -= 64;
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262 |
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memcpy (ctx->buffer, &ctx->buffer[16], left_over);
|
263 |
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}
|
264 |
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ctx->buflen = left_over;
|
265 |
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}
|
266 |
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}
|
267 |
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|
268 |
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/* --- Code below is the primary difference between md5.c and sha1.c --- */
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269 |
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|
270 |
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/* SHA1 round constants */
|
271 |
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#define K1 0x5a827999
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272 |
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#define K2 0x6ed9eba1
|
273 |
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#define K3 0x8f1bbcdc
|
274 |
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#define K4 0xca62c1d6
|
275 |
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|
276 |
|
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/* Round functions. Note that F2 is the same as F4. */
|
277 |
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#define F1(B,C,D) ( D ^ ( B & ( C ^ D ) ) )
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278 |
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#define F2(B,C,D) (B ^ C ^ D)
|
279 |
|
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#define F3(B,C,D) ( ( B & C ) | ( D & ( B | C ) ) )
|
280 |
|
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#define F4(B,C,D) (B ^ C ^ D)
|
281 |
|
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|
282 |
|
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/* Process LEN bytes of BUFFER, accumulating context into CTX.
|
283 |
|
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It is assumed that LEN % 64 == 0.
|
284 |
|
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Most of this code comes from GnuPG's cipher/sha1.c. */
|
285 |
|
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|
286 |
|
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void
|
287 |
|
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sha1_process_block (const void *buffer, size_t len, struct sha1_ctx *ctx)
|
288 |
|
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{
|
289 |
|
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const sha1_uint32 *words = (const sha1_uint32*) buffer;
|
290 |
|
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size_t nwords = len / sizeof (sha1_uint32);
|
291 |
|
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const sha1_uint32 *endp = words + nwords;
|
292 |
|
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sha1_uint32 x[16];
|
293 |
|
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sha1_uint32 a = ctx->A;
|
294 |
|
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sha1_uint32 b = ctx->B;
|
295 |
|
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sha1_uint32 c = ctx->C;
|
296 |
|
|
sha1_uint32 d = ctx->D;
|
297 |
|
|
sha1_uint32 e = ctx->E;
|
298 |
|
|
|
299 |
|
|
/* First increment the byte count. RFC 1321 specifies the possible
|
300 |
|
|
length of the file up to 2^64 bits. Here we only compute the
|
301 |
|
|
number of bytes. Do a double word increment. */
|
302 |
|
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ctx->total[0] += len;
|
303 |
|
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if (ctx->total[0] < len)
|
304 |
|
|
++ctx->total[1];
|
305 |
|
|
|
306 |
|
|
#define rol(x, n) (((x) << (n)) | ((sha1_uint32) (x) >> (32 - (n))))
|
307 |
|
|
|
308 |
|
|
#define M(I) ( tm = x[I&0x0f] ^ x[(I-14)&0x0f] \
|
309 |
|
|
^ x[(I-8)&0x0f] ^ x[(I-3)&0x0f] \
|
310 |
|
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, (x[I&0x0f] = rol(tm, 1)) )
|
311 |
|
|
|
312 |
|
|
#define R(A,B,C,D,E,F,K,M) do { E += rol( A, 5 ) \
|
313 |
|
|
+ F( B, C, D ) \
|
314 |
|
|
+ K \
|
315 |
|
|
+ M; \
|
316 |
|
|
B = rol( B, 30 ); \
|
317 |
|
|
} while(0)
|
318 |
|
|
|
319 |
|
|
while (words < endp)
|
320 |
|
|
{
|
321 |
|
|
sha1_uint32 tm;
|
322 |
|
|
int t;
|
323 |
|
|
for (t = 0; t < 16; t++)
|
324 |
|
|
{
|
325 |
|
|
x[t] = SWAP (*words);
|
326 |
|
|
words++;
|
327 |
|
|
}
|
328 |
|
|
|
329 |
|
|
R( a, b, c, d, e, F1, K1, x[ 0] );
|
330 |
|
|
R( e, a, b, c, d, F1, K1, x[ 1] );
|
331 |
|
|
R( d, e, a, b, c, F1, K1, x[ 2] );
|
332 |
|
|
R( c, d, e, a, b, F1, K1, x[ 3] );
|
333 |
|
|
R( b, c, d, e, a, F1, K1, x[ 4] );
|
334 |
|
|
R( a, b, c, d, e, F1, K1, x[ 5] );
|
335 |
|
|
R( e, a, b, c, d, F1, K1, x[ 6] );
|
336 |
|
|
R( d, e, a, b, c, F1, K1, x[ 7] );
|
337 |
|
|
R( c, d, e, a, b, F1, K1, x[ 8] );
|
338 |
|
|
R( b, c, d, e, a, F1, K1, x[ 9] );
|
339 |
|
|
R( a, b, c, d, e, F1, K1, x[10] );
|
340 |
|
|
R( e, a, b, c, d, F1, K1, x[11] );
|
341 |
|
|
R( d, e, a, b, c, F1, K1, x[12] );
|
342 |
|
|
R( c, d, e, a, b, F1, K1, x[13] );
|
343 |
|
|
R( b, c, d, e, a, F1, K1, x[14] );
|
344 |
|
|
R( a, b, c, d, e, F1, K1, x[15] );
|
345 |
|
|
R( e, a, b, c, d, F1, K1, M(16) );
|
346 |
|
|
R( d, e, a, b, c, F1, K1, M(17) );
|
347 |
|
|
R( c, d, e, a, b, F1, K1, M(18) );
|
348 |
|
|
R( b, c, d, e, a, F1, K1, M(19) );
|
349 |
|
|
R( a, b, c, d, e, F2, K2, M(20) );
|
350 |
|
|
R( e, a, b, c, d, F2, K2, M(21) );
|
351 |
|
|
R( d, e, a, b, c, F2, K2, M(22) );
|
352 |
|
|
R( c, d, e, a, b, F2, K2, M(23) );
|
353 |
|
|
R( b, c, d, e, a, F2, K2, M(24) );
|
354 |
|
|
R( a, b, c, d, e, F2, K2, M(25) );
|
355 |
|
|
R( e, a, b, c, d, F2, K2, M(26) );
|
356 |
|
|
R( d, e, a, b, c, F2, K2, M(27) );
|
357 |
|
|
R( c, d, e, a, b, F2, K2, M(28) );
|
358 |
|
|
R( b, c, d, e, a, F2, K2, M(29) );
|
359 |
|
|
R( a, b, c, d, e, F2, K2, M(30) );
|
360 |
|
|
R( e, a, b, c, d, F2, K2, M(31) );
|
361 |
|
|
R( d, e, a, b, c, F2, K2, M(32) );
|
362 |
|
|
R( c, d, e, a, b, F2, K2, M(33) );
|
363 |
|
|
R( b, c, d, e, a, F2, K2, M(34) );
|
364 |
|
|
R( a, b, c, d, e, F2, K2, M(35) );
|
365 |
|
|
R( e, a, b, c, d, F2, K2, M(36) );
|
366 |
|
|
R( d, e, a, b, c, F2, K2, M(37) );
|
367 |
|
|
R( c, d, e, a, b, F2, K2, M(38) );
|
368 |
|
|
R( b, c, d, e, a, F2, K2, M(39) );
|
369 |
|
|
R( a, b, c, d, e, F3, K3, M(40) );
|
370 |
|
|
R( e, a, b, c, d, F3, K3, M(41) );
|
371 |
|
|
R( d, e, a, b, c, F3, K3, M(42) );
|
372 |
|
|
R( c, d, e, a, b, F3, K3, M(43) );
|
373 |
|
|
R( b, c, d, e, a, F3, K3, M(44) );
|
374 |
|
|
R( a, b, c, d, e, F3, K3, M(45) );
|
375 |
|
|
R( e, a, b, c, d, F3, K3, M(46) );
|
376 |
|
|
R( d, e, a, b, c, F3, K3, M(47) );
|
377 |
|
|
R( c, d, e, a, b, F3, K3, M(48) );
|
378 |
|
|
R( b, c, d, e, a, F3, K3, M(49) );
|
379 |
|
|
R( a, b, c, d, e, F3, K3, M(50) );
|
380 |
|
|
R( e, a, b, c, d, F3, K3, M(51) );
|
381 |
|
|
R( d, e, a, b, c, F3, K3, M(52) );
|
382 |
|
|
R( c, d, e, a, b, F3, K3, M(53) );
|
383 |
|
|
R( b, c, d, e, a, F3, K3, M(54) );
|
384 |
|
|
R( a, b, c, d, e, F3, K3, M(55) );
|
385 |
|
|
R( e, a, b, c, d, F3, K3, M(56) );
|
386 |
|
|
R( d, e, a, b, c, F3, K3, M(57) );
|
387 |
|
|
R( c, d, e, a, b, F3, K3, M(58) );
|
388 |
|
|
R( b, c, d, e, a, F3, K3, M(59) );
|
389 |
|
|
R( a, b, c, d, e, F4, K4, M(60) );
|
390 |
|
|
R( e, a, b, c, d, F4, K4, M(61) );
|
391 |
|
|
R( d, e, a, b, c, F4, K4, M(62) );
|
392 |
|
|
R( c, d, e, a, b, F4, K4, M(63) );
|
393 |
|
|
R( b, c, d, e, a, F4, K4, M(64) );
|
394 |
|
|
R( a, b, c, d, e, F4, K4, M(65) );
|
395 |
|
|
R( e, a, b, c, d, F4, K4, M(66) );
|
396 |
|
|
R( d, e, a, b, c, F4, K4, M(67) );
|
397 |
|
|
R( c, d, e, a, b, F4, K4, M(68) );
|
398 |
|
|
R( b, c, d, e, a, F4, K4, M(69) );
|
399 |
|
|
R( a, b, c, d, e, F4, K4, M(70) );
|
400 |
|
|
R( e, a, b, c, d, F4, K4, M(71) );
|
401 |
|
|
R( d, e, a, b, c, F4, K4, M(72) );
|
402 |
|
|
R( c, d, e, a, b, F4, K4, M(73) );
|
403 |
|
|
R( b, c, d, e, a, F4, K4, M(74) );
|
404 |
|
|
R( a, b, c, d, e, F4, K4, M(75) );
|
405 |
|
|
R( e, a, b, c, d, F4, K4, M(76) );
|
406 |
|
|
R( d, e, a, b, c, F4, K4, M(77) );
|
407 |
|
|
R( c, d, e, a, b, F4, K4, M(78) );
|
408 |
|
|
R( b, c, d, e, a, F4, K4, M(79) );
|
409 |
|
|
|
410 |
|
|
a = ctx->A += a;
|
411 |
|
|
b = ctx->B += b;
|
412 |
|
|
c = ctx->C += c;
|
413 |
|
|
d = ctx->D += d;
|
414 |
|
|
e = ctx->E += e;
|
415 |
|
|
}
|
416 |
|
|
}
|