diff options
Diffstat (limited to 'lgl/md5.c')
| -rw-r--r-- | lgl/md5.c | 30 |
1 files changed, 17 insertions, 13 deletions
@@ -1,6 +1,6 @@ /* 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) 1995,1996,1997,1999,2000,2001,2005,2006 + Copyright (C) 1995,1996,1997,1999,2000,2001,2005,2006,2008 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -80,27 +80,31 @@ md5_init_ctx (struct md5_ctx *ctx) 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-bit 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-bit value. */ + prolog according to the standard and write the result to RESBUF. */ void * md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) { |