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block-sha1: move code around

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Move the code around so specific architecture hacks are defined first.
Also make one line comments actually one line.  No code change.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nicolas Pitre 2009-08-12 15:45:48 -04:00 committed by Junio C Hamano
parent 926172c5e4
commit 30ba0de726
1 changed files with 60 additions and 69 deletions
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129
block-sha1/sha1.c
View File

@ -9,74 +9,6 @@
#include "sha1.h"
/* Hash one 64-byte block of data */
static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data);
void blk_SHA1_Init(blk_SHA_CTX *ctx)
{
ctx->size = 0;
/* Initialize H with the magic constants (see FIPS180 for constants)
*/
ctx->H[0] = 0x67452301;
ctx->H[1] = 0xefcdab89;
ctx->H[2] = 0x98badcfe;
ctx->H[3] = 0x10325476;
ctx->H[4] = 0xc3d2e1f0;
}
void blk_SHA1_Update(blk_SHA_CTX *ctx, const void *data, unsigned long len)
{
int lenW = ctx->size & 63;
ctx->size += len;
/* Read the data into W and process blocks as they get full
*/
if (lenW) {
int left = 64 - lenW;
if (len < left)
left = len;
memcpy(lenW + (char *)ctx->W, data, left);
lenW = (lenW + left) & 63;
len -= left;
data += left;
if (lenW)
return;
blk_SHA1Block(ctx, ctx->W);
}
while (len >= 64) {
blk_SHA1Block(ctx, data);
data += 64;
len -= 64;
}
if (len)
memcpy(ctx->W, data, len);
}
void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx)
{
static const unsigned char pad[64] = { 0x80 };
unsigned int padlen[2];
int i;
/* Pad with a binary 1 (ie 0x80), then zeroes, then length
*/
padlen[0] = htonl(ctx->size >> 29);
padlen[1] = htonl(ctx->size << 3);
i = ctx->size & 63;
blk_SHA1_Update(ctx, pad, 1+ (63 & (55 - i)));
blk_SHA1_Update(ctx, padlen, 8);
/* Output hash
*/
for (i = 0; i < 5; i++)
((unsigned int *)hashout)[i] = htonl(ctx->H[i]);
}
#if defined(__i386__) || defined(__x86_64__)
#define SHA_ASM(op, x, n) ({ unsigned int __res; __asm__(op " %1,%0":"=r" (__res):"i" (n), "0" (x)); __res; })
@ -136,7 +68,7 @@ void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx)
#define T_40_59(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, ((B&C)+(D&(B^C))) , 0x8f1bbcdc, A, B, C, D, E )
#define T_60_79(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, (B^C^D) , 0xca62c1d6, A, B, C, D, E )
static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data)
static void blk_SHA1_Block(blk_SHA_CTX *ctx, const unsigned int *data)
{
unsigned int A,B,C,D,E;
unsigned int array[16];
@ -243,3 +175,62 @@ static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data)
ctx->H[3] += D;
ctx->H[4] += E;
}
void blk_SHA1_Init(blk_SHA_CTX *ctx)
{
ctx->size = 0;
/* Initialize H with the magic constants (see FIPS180 for constants) */
ctx->H[0] = 0x67452301;
ctx->H[1] = 0xefcdab89;
ctx->H[2] = 0x98badcfe;
ctx->H[3] = 0x10325476;
ctx->H[4] = 0xc3d2e1f0;
}
void blk_SHA1_Update(blk_SHA_CTX *ctx, const void *data, unsigned long len)
{
int lenW = ctx->size & 63;
ctx->size += len;
/* Read the data into W and process blocks as they get full */
if (lenW) {
int left = 64 - lenW;
if (len < left)
left = len;
memcpy(lenW + (char *)ctx->W, data, left);
lenW = (lenW + left) & 63;
len -= left;
data += left;
if (lenW)
return;
blk_SHA1_Block(ctx, ctx->W);
}
while (len >= 64) {
blk_SHA1_Block(ctx, data);
data += 64;
len -= 64;
}
if (len)
memcpy(ctx->W, data, len);
}
void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx)
{
static const unsigned char pad[64] = { 0x80 };
unsigned int padlen[2];
int i;
/* Pad with a binary 1 (ie 0x80), then zeroes, then length */
padlen[0] = htonl(ctx->size >> 29);
padlen[1] = htonl(ctx->size << 3);
i = ctx->size & 63;
blk_SHA1_Update(ctx, pad, 1+ (63 & (55 - i)));
blk_SHA1_Update(ctx, padlen, 8);
/* Output hash */
for (i = 0; i < 5; i++)
((unsigned int *)hashout)[i] = htonl(ctx->H[i]);
}