/*
* Copyright (c) 2008 - 2010
* Jonathan Schleifer <js@webkeks.org>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE included in
* the packaging of this file.
*/
#include "config.h"
#include <string.h>
#import "OFSHA1Hash.h"
#import "OFExceptions.h"
#import "macros.h"
/* blk0() and blk() perform the initial expand. */
#ifndef OF_BIG_ENDIAN
#define blk0(i) \
(block->l[i] = (OF_ROL(block->l[i], 24) & 0xFF00FF00) | \
(OF_ROL(block->l[i], 8) & 0x00FF00FF))
#else
#define blk0(i) block->l[i]
#endif
#define blk(i) \
(block->l[i & 15] = OF_ROL(block->l[(i + 13) & 15] ^ \
block->l[(i + 8) & 15] ^ block->l[(i + 2) & 15] ^ \
block->l[i & 15], 1))
/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
#define R0(v, w, x, y, z, i) \
z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + OF_ROL(v, 5); \
w = OF_ROL(w, 30);
#define R1(v, w, x, y, z, i) \
z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + OF_ROL(v, 5); \
w = OF_ROL(w, 30);
#define R2(v, w, x, y, z, i) \
z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + OF_ROL(v, 5); \
w = OF_ROL(w, 30);
#define R3(v, w, x, y, z, i) \
z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + OF_ROL(v, 5); \
w = OF_ROL(w, 30);
#define R4(v, w, x, y, z, i) \
z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + OF_ROL(v, 5); \
w = OF_ROL(w, 30);
/// \cond internal
typedef union {
char c[64];
uint32_t l[16];
} sha1_c64l16_t;
/// \endcond
static inline void
sha1_transform(uint32_t state[5], const char buffer[64])
{
uint32_t a, b, c, d, e;
char workspace[64];
sha1_c64l16_t *block;
block = (sha1_c64l16_t*)workspace;
memcpy(block, buffer, 64);
/* Copy state[] to working vars */
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
/* 4 rounds of 20 operations each. Loop unrolled. */
R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
/* Add the working vars back into state[] */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
}
static inline void
sha1_update(uint32_t *state, uint64_t *count, char *buffer,
const char *buf, size_t size)
{
size_t i, j;
j = (size_t)((*count >> 3) & 63);
*count += (size << 3);
if ((j + size) > 63) {
memcpy(&buffer[j], buf, (i = 64 - j));
sha1_transform(state, buffer);
for (; i + 63 < size; i += 64)
sha1_transform(state, &buf[i]);
j = 0;
} else
i = 0;
memcpy(&buffer[j], &buf[i], size - i);
}
@implementation OFSHA1Hash
+ sha1Hash
{
return [[[self alloc] init] autorelease];
}
- init
{
self = [super init];
state[0] = 0x67452301;
state[1] = 0xEFCDAB89;
state[2] = 0x98BADCFE;
state[3] = 0x10325476;
state[4] = 0xC3D2E1F0;
return self;
}
- (void)updateWithBuffer: (const char*)buf
ofSize: (size_t)size
{
if (size == 0)
return;
if (calculated)
@throw [OFHashAlreadyCalculatedException newWithClass: isa];
sha1_update(state, &count, buffer, buf, size);
}
- (uint8_t*)digest
{
size_t i;
char finalcount[8];
if (calculated)
return digest;
for (i = 0; i < 8; i++)
/* Endian independent */
finalcount[i] = (char)((count >> ((7 - (i & 7)) * 8)) & 255);
sha1_update(state, &count, buffer, "\200", 1);
while ((count & 504) != 448)
sha1_update(state, &count, buffer, "\0", 1);
/* Should cause a sha1_transform() */
sha1_update(state, &count, buffer, finalcount, 8);
for (i = 0; i < OF_SHA1_DIGEST_SIZE; i++)
digest[i] = (char)((state[i >> 2] >>
((3 - (i & 3)) * 8)) & 255);
calculated = YES;
return digest;
}
@end