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General MD5 cleanups.

Browse source 
I did these in passing while looking for the bug in the previous
commit, and they seem like general improvements, so I'll keep them.
This commit is contained in:
Simon Tatham 2017-05-18 18:49:35 +01:00
parent 4b3314ff48
commit 2cab25bf14
1 changed files with 24 additions and 34 deletions
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58
md5.c
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@ -153,7 +153,6 @@ static void MD5Init(struct MD5Context *s)
static void MD5Update(struct MD5Context *s, unsigned char const *p,
unsigned len)
{
unsigned char *q = (unsigned char *) p;
uint32_t wordblock[16];
int i;
@ -162,33 +161,31 @@ static void MD5Update(struct MD5Context *s, unsigned char const *p,
*/
s->len += len;
if (s->blkused + len < BLKSIZE) {
while (len >= BLKSIZE - s->blkused) {
/*
* Complete and process a hash block.
*/
memcpy(s->block + s->blkused, p, BLKSIZE - s->blkused);
p += BLKSIZE - s->blkused;
len -= BLKSIZE - s->blkused;
/* Now process the block. Gather bytes little-endian into words */
for (i = 0; i < 16; i++) {
wordblock[i] =
(((uint32_t) s->block[i * 4 + 3]) << 24) |
(((uint32_t) s->block[i * 4 + 2]) << 16) |
(((uint32_t) s->block[i * 4 + 1]) << 8) |
(((uint32_t) s->block[i * 4 + 0]) << 0);
}
MD5_Block(&s->core, wordblock);
s->blkused = 0;
}
if (len > 0) {
/*
* Trivial case: just add to the block.
* Append to the block.
*/
memcpy(s->block + s->blkused, q, len);
memcpy(s->block + s->blkused, p, len);
s->blkused += len;
} else {
/*
* We must complete and process at least one block.
*/
while (s->blkused + len >= BLKSIZE) {
memcpy(s->block + s->blkused, q, BLKSIZE - s->blkused);
q += BLKSIZE - s->blkused;
len -= BLKSIZE - s->blkused;
/* Now process the block. Gather bytes little-endian into words */
for (i = 0; i < 16; i++) {
wordblock[i] =
(((uint32_t) s->block[i * 4 + 3]) << 24) |
(((uint32_t) s->block[i * 4 + 2]) << 16) |
(((uint32_t) s->block[i * 4 + 1]) << 8) |
(((uint32_t) s->block[i * 4 + 0]) << 0);
}
MD5_Block(&s->core, wordblock);
s->blkused = 0;
}
memcpy(s->block, q, len);
s->blkused = len;
}
}
@ -210,15 +207,8 @@ static void MD5Final(uint32_t output[4], struct MD5Context *s)
c[0] = 0x80;
MD5Update(s, c, pad);
c[7] = (len >> (8*7)) & 0xFF;
c[6] = (len >> (8*6)) & 0xFF;
c[5] = (len >> (8*5)) & 0xFF;
c[4] = (len >> (8*4)) & 0xFF;
c[3] = (len >> (8*3)) & 0xFF;
c[2] = (len >> (8*2)) & 0xFF;
c[1] = (len >> (8*1)) & 0xFF;
c[0] = (len >> (8*0)) & 0xFF;
for (i = 0; i < 8; i++)
c[i] = (len >> (8*i)) & 0xFF;
MD5Update(s, c, 8);
for (i = 0; i < 4; i++)