/* md5.c - Functions to compute MD5 message digest of files or memory blocks
according to the definition of MD5 in RFC 1321 from April 1992.
- Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+ Copyright (C) 1995, 1996, 2011 Free Software Foundation, Inc.
NOTE: This source is derived from an old version taken from the GNU C
Library (glibc).
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */
/* Initialize structure containing state of computation.
(RFC 1321, 3.3: Step 3) */
void
-md5_init_ctx (ctx)
- struct md5_ctx *ctx;
+md5_init_ctx (struct md5_ctx *ctx)
{
ctx->A = (md5_uint32) 0x67452301;
ctx->B = (md5_uint32) 0xefcdab89;
/* Put result from CTX in first 16 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 bits value. */
+ IMPORTANT: RESBUF may not be aligned as strongly as MD5_UNIT32 so we
+ put things in a local (aligned) buffer first, then memcpy into RESBUF. */
void *
-md5_read_ctx (ctx, resbuf)
- const struct md5_ctx *ctx;
- void *resbuf;
+md5_read_ctx (const struct md5_ctx *ctx, void *resbuf)
{
- ((md5_uint32 *) resbuf)[0] = SWAP (ctx->A);
- ((md5_uint32 *) resbuf)[1] = SWAP (ctx->B);
- ((md5_uint32 *) resbuf)[2] = SWAP (ctx->C);
- ((md5_uint32 *) resbuf)[3] = SWAP (ctx->D);
+ md5_uint32 buffer[4];
+
+ buffer[0] = SWAP (ctx->A);
+ buffer[1] = SWAP (ctx->B);
+ buffer[2] = SWAP (ctx->C);
+ buffer[3] = SWAP (ctx->D);
+
+ memcpy (resbuf, buffer, 16);
return resbuf;
}
IMPORTANT: On some systems it is required that RESBUF is correctly
aligned for a 32 bits value. */
void *
-md5_finish_ctx (ctx, resbuf)
- struct md5_ctx *ctx;
- void *resbuf;
+md5_finish_ctx (struct md5_ctx *ctx, void *resbuf)
{
/* Take yet unprocessed bytes into account. */
md5_uint32 bytes = ctx->buflen;
+ md5_uint32 swap_bytes;
size_t pad;
/* Now count remaining 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. */
- *(md5_uint32 *) &ctx->buffer[bytes + pad] = SWAP (ctx->total[0] << 3);
- *(md5_uint32 *) &ctx->buffer[bytes + pad + 4] = SWAP ((ctx->total[1] << 3) |
- (ctx->total[0] >> 29));
+ /* Put the 64-bit file length in *bits* at the end of the buffer.
+ Use memcpy to avoid aliasing problems. On most systems, this
+ will be optimized away to the same code. */
+ swap_bytes = SWAP (ctx->total[0] << 3);
+ memcpy (&ctx->buffer[bytes + pad], &swap_bytes, sizeof (swap_bytes));
+ swap_bytes = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
+ memcpy (&ctx->buffer[bytes + pad + 4], &swap_bytes, sizeof (swap_bytes));
/* Process last bytes. */
md5_process_block (ctx->buffer, bytes + pad + 8, ctx);
resulting message digest number will be written into the 16 bytes
beginning at RESBLOCK. */
int
-md5_stream (stream, resblock)
- FILE *stream;
- void *resblock;
+md5_stream (FILE *stream, void *resblock)
{
/* Important: BLOCKSIZE must be a multiple of 64. */
#define BLOCKSIZE 4096
output yields to the wanted ASCII representation of the message
digest. */
void *
-md5_buffer (buffer, len, resblock)
- const char *buffer;
- size_t len;
- void *resblock;
+md5_buffer (const char *buffer, size_t len, void *resblock)
{
struct md5_ctx ctx;
void
-md5_process_bytes (buffer, len, ctx)
- const void *buffer;
- size_t len;
- struct md5_ctx *ctx;
+md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx)
{
/* When we already have some bits in our internal buffer concatenate
both inputs first. */
/* Process available complete blocks. */
if (len > 64)
{
- md5_process_block (buffer, len & ~63, ctx);
- buffer = (const void *) ((const char *) buffer + (len & ~63));
- len &= 63;
+#if !_STRING_ARCH_unaligned
+/* To check alignment gcc has an appropriate operator. Other
+ compilers don't. */
+# if __GNUC__ >= 2
+# define UNALIGNED_P(p) (((md5_uintptr) p) % __alignof__ (md5_uint32) != 0)
+# else
+# define UNALIGNED_P(p) (((md5_uintptr) p) % sizeof (md5_uint32) != 0)
+# endif
+ if (UNALIGNED_P (buffer))
+ while (len > 64)
+ {
+ memcpy (ctx->buffer, buffer, 64);
+ md5_process_block (ctx->buffer, 64, ctx);
+ buffer = (const char *) buffer + 64;
+ len -= 64;
+ }
+ else
+#endif
+ {
+ md5_process_block (buffer, len & ~63, ctx);
+ buffer = (const void *) ((const char *) buffer + (len & ~63));
+ len &= 63;
+ }
}
/* Move remaining bytes in internal buffer. */
It is assumed that LEN % 64 == 0. */
void
-md5_process_block (buffer, len, ctx)
- const void *buffer;
- size_t len;
- struct md5_ctx *ctx;
+md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx)
{
md5_uint32 correct_words[16];
const md5_uint32 *words = (const md5_uint32 *) buffer;
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];
+ ctx->total[1] += ((len >> 31) >> 1) + (ctx->total[0] < len);
/* Process all bytes in the buffer with 64 bytes in each round of
the loop. */
projects / deliverable / binutils-gdb.git / blobdiff