/* 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) 1995,1996,1997,1999,2000,2001,2005
+ Copyright (C) 1995,1996,1997,1999,2000,2001,2005,2006,2008
Free Software Foundation, Inc.
This file is part of the GNU C Library.
/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "md5.h"
ctx->buflen = 0;
}
-/* Put result from CTX in first 16 bytes following RESBUF. The result
- must be in little endian byte order.
+/* Copy the 4 byte value from v into the memory location pointed to by *cp,
+ If your architecture allows unaligned access this is equivalent to
+ * (uint32_t *) cp = v */
+static inline void
+set_uint32 (char *cp, uint32_t v)
+{
+ memcpy (cp, &v, sizeof v);
+}
- IMPORTANT: On some systems it is required that RESBUF is correctly
- aligned for a 32 bits value. */
+/* Put result from CTX in first 16 bytes following RESBUF. The result
+ must be in little endian byte order. */
void *
md5_read_ctx (const struct md5_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);
+ char *r = resbuf;
+ set_uint32 (r + 0 * sizeof ctx->A, SWAP (ctx->A));
+ set_uint32 (r + 1 * sizeof ctx->B, SWAP (ctx->B));
+ set_uint32 (r + 2 * sizeof ctx->C, SWAP (ctx->C));
+ set_uint32 (r + 3 * sizeof ctx->D, SWAP (ctx->D));
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 bits value. */
+ prolog according to the standard and write the result to RESBUF. */
void *
md5_finish_ctx (struct md5_ctx *ctx, void *resbuf)
{
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 alignof(type) offsetof (struct { char c; type x; }, x)
-# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
-# endif
+# 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)
{
argument specifying the function to use. */
#undef OP
#define OP(f, a, b, c, d, k, s, T) \
- do \
+ do \
{ \
a += f (b, c, d) + correct_words[k] + T; \
CYCLIC (a, s); \