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md5: fix strict aliasing warnings 

This is the same fix as was merged in gcc/binutils where this code
appears to originate from.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2012-10-10 00:22:38 -04:00 committed by Karel Zak
parent 5eec85708d
commit 6c6f719688
1 changed files with 6 additions and 3 deletions
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9
lib/md5.c
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@ -138,9 +138,12 @@ void MD5Final(unsigned char digest[MD5LENGTH], struct MD5Context *ctx)
}
byteReverse(ctx->in, 14);
/* Append length in bits and transform */
((uint32_t *) ctx->in)[14] = ctx->bits[0];
((uint32_t *) ctx->in)[15] = ctx->bits[1];
/* Append length in bits and transform.
* Use memcpy to avoid aliasing problems. On most systems,
* this will be optimized away to the same code.
*/
memcpy(&ctx->in[14 * sizeof(uint32_t)], &ctx->bits[0], 4);
memcpy(&ctx->in[15 * sizeof(uint32_t)], &ctx->bits[1], 4);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
byteReverse((unsigned char *) ctx->buf, 4);