mirror of
https://github.com/git/git.git
synced 2024-11-05 00:37:55 +01:00
7c6ef2f214
This is my ARM assembly SHA1 implementation for GIT. It is approximately 50% faster than the generic C version. On an XScale processor running at 400MHz: generic C version: 9.8 MB/s my version: 14.5 MB/s It's not that I expect a lot of big GIT users on ARM, but I stillknow about one important ARM user that might benefit from it, and writing that code was fun. I also reworked the makefile a bit so any optimized SHA1 implementations is used regardless of whether NO_OPENSSL is defined or not. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
|
|
* SHA-1 implementation optimized for ARM
|
|
*
|
|
* Copyright: (C) 2005 by Nicolas Pitre <nico@cam.org>
|
|
* Created: September 17, 2005
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include "sha1.h"
|
|
|
|
extern void sha_transform(uint32_t *hash, const unsigned char *data, uint32_t *W);
|
|
|
|
void SHA1_Init(SHA_CTX *c)
|
|
{
|
|
c->len = 0;
|
|
c->hash[0] = 0x67452301;
|
|
c->hash[1] = 0xefcdab89;
|
|
c->hash[2] = 0x98badcfe;
|
|
c->hash[3] = 0x10325476;
|
|
c->hash[4] = 0xc3d2e1f0;
|
|
}
|
|
|
|
void SHA1_Update(SHA_CTX *c, const void *p, unsigned long n)
|
|
{
|
|
uint32_t workspace[80];
|
|
unsigned int partial;
|
|
unsigned long done;
|
|
|
|
partial = c->len & 0x3f;
|
|
c->len += n;
|
|
if ((partial + n) >= 64) {
|
|
if (partial) {
|
|
done = 64 - partial;
|
|
memcpy(c->buffer + partial, p, done);
|
|
sha_transform(c->hash, c->buffer, workspace);
|
|
partial = 0;
|
|
} else
|
|
done = 0;
|
|
while (n >= done + 64) {
|
|
sha_transform(c->hash, p + done, workspace);
|
|
done += 64;
|
|
}
|
|
} else
|
|
done = 0;
|
|
if (n - done)
|
|
memcpy(c->buffer + partial, p + done, n - done);
|
|
}
|
|
|
|
void SHA1_Final(unsigned char *hash, SHA_CTX *c)
|
|
{
|
|
uint64_t bitlen;
|
|
uint32_t bitlen_hi, bitlen_lo;
|
|
unsigned int i, offset, padlen;
|
|
unsigned char bits[8];
|
|
static const unsigned char padding[64] = { 0x80, };
|
|
|
|
bitlen = c->len << 3;
|
|
offset = c->len & 0x3f;
|
|
padlen = ((offset < 56) ? 56 : (64 + 56)) - offset;
|
|
SHA1_Update(c, padding, padlen);
|
|
|
|
bitlen_hi = bitlen >> 32;
|
|
bitlen_lo = bitlen & 0xffffffff;
|
|
bits[0] = bitlen_hi >> 24;
|
|
bits[1] = bitlen_hi >> 16;
|
|
bits[2] = bitlen_hi >> 8;
|
|
bits[3] = bitlen_hi;
|
|
bits[4] = bitlen_lo >> 24;
|
|
bits[5] = bitlen_lo >> 16;
|
|
bits[6] = bitlen_lo >> 8;
|
|
bits[7] = bitlen_lo;
|
|
SHA1_Update(c, bits, 8);
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
uint32_t v = c->hash[i];
|
|
hash[0] = v >> 24;
|
|
hash[1] = v >> 16;
|
|
hash[2] = v >> 8;
|
|
hash[3] = v;
|
|
hash += 4;
|
|
}
|
|
}
|