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Improve the handling of Encode and Decode operations in MD5.

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Use memcpy for all little-endian architectures, sys/kern/md5c.c indicates
this should be safe for all currently supported LE archs.

Change the Encode and Decode functions for other archs to use le32toh()
and htole32() functions instead of explicit byte shuffling.

On sparc64 this gives md5(1) about 8% speed increase.
This commit is contained in:
Poul-Henning Kamp 2002-06-22 12:54:11 +00:00
parent 893305fe5e
commit af03a3cbd6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=98615
1 changed files with 15 additions and 22 deletions
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37
lib/libmd/md5c.c
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@ -37,6 +37,8 @@ __FBSDID("$FreeBSD$");
#include <string.h>
#endif
#include <machine/endian.h>
#include <sys/endian.h>
#include <sys/md5.h>
static void MD5Transform(u_int32_t [4], const unsigned char [64]);
@ -46,10 +48,10 @@ static void MD5Transform(u_int32_t [4], const unsigned char [64]);
#define memcpy(x,y,z) bcopy(y, x, z)
#endif
#ifdef i386
#if (BYTE_ORDER == LITTLE_ENDIAN)
#define Encode memcpy
#define Decode memcpy
#else /* i386 */
#else
/*
* Encodes input (u_int32_t) into output (unsigned char). Assumes len is
@ -57,19 +59,13 @@ static void MD5Transform(u_int32_t [4], const unsigned char [64]);
*/
static void
Encode (output, input, len)
unsigned char *output;
u_int32_t *input;
unsigned int len;
Encode (unsigned char *output, u_int32_t *input, unsigned int len)
{
unsigned int i, j;
unsigned int i;
u_int32_t *op = (u_int32_t *)output;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (unsigned char)(input[i] & 0xff);
output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
}
for (i = 0; i < len / 4; i++)
op[i] = htole32(input[i]);
}
/*
@ -78,18 +74,15 @@ Encode (output, input, len)
*/
static void
Decode (output, input, len)
u_int32_t *output;
const unsigned char *input;
unsigned int len;
Decode (u_int32_t *output, const unsigned char *input, unsigned int len)
{
unsigned int i, j;
unsigned int i;
u_int32_t *ip = (u_int32_t *)input;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((u_int32_t)input[j]) | (((u_int32_t)input[j+1]) << 8) |
(((u_int32_t)input[j+2]) << 16) | (((u_int32_t)input[j+3]) << 24);
for (i = 0; i < len / 4; i++)
output[i] = le32toh(ip[i]);
}
#endif /* i386 */
#endif
static unsigned char PADDING[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,