/*
* Copyright (c) 2008, 2009, 2010, 2011
* 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.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "config.h"
#include <string.h>
#import "OFMD5Hash.h"
#import "OFHashAlreadyCalculatedException.h"
#import "macros.h"
/* The four MD5 core functions - F1 is optimized somewhat */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
/* This is the central step in the MD5 algorithm. */
#define MD5STEP(f, w, x, y, z, data, s) \
(w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
static void
md5_transform(uint32_t buffer[4], const uint32_t in[16])
{
register uint32_t a, b, c, d;
a = buffer[0];
b = buffer[1];
c = buffer[2];
d = buffer[3];
MD5STEP(F1, a, b, c, d, in[0] + 0xD76AA478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xE8C7B756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070DB, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xC1BDCEEE, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xF57C0FAF, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787C62A, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xA8304613, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xFD469501, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098D8, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8B44F7AF, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xFFFF5BB1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895CD7Be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6B901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xFD987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xA679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49B40821, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xF61E2562, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xC040B340, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265E5A51, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xE9B6C7AA, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xD62F105D, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xD8A1E681, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xE7D3FBC8, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21E1CDE6, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xC33707D6, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xF4D50D87, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455A14ED, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xA9E3E905, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xFCEFA3F8, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676F02D9, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8D2A4C8a, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xFFFA3942, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771F681, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6D9D6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xFDE5380c, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xA4BEEA44, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4BDECFA9, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xF6BB4B60, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xBEBFBC70, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289B7EC6, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xEAA127FA, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xD4EF3085, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881D05, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xD9D4D039, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xE6DB99E5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1FA27CF8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xC4AC5665, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xF4292244, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432AFF97, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xAB9423A7, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xFC93A039, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655B59C3, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8F0CCC92, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xFFEFF47d, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845DD1, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6FA87E4F, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xFE2CE6E0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xA3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4E0811A1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xF7537E82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xBD3AF235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2AD7D2BB, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xEB86D391, 21);
buffer[0] += a;
buffer[1] += b;
buffer[2] += c;
buffer[3] += d;
}
@implementation OFMD5Hash
+ MD5Hash
{
return [[[self alloc] init] autorelease];
}
+ (size_t)digestSize
{
return 16;
}
+ (size_t)blockSize
{
return 64;
}
- init
{
self = [super init];
buffer[0] = 0x67452301;
buffer[1] = 0xEFCDAB89;
buffer[2] = 0x98BADCFE;
buffer[3] = 0x10325476;
return self;
}
- (void)updateWithBuffer: (const char*)buffer_
length: (size_t)length
{
uint32_t t;
if (length == 0)
return;
if (calculated)
@throw [OFHashAlreadyCalculatedException newWithClass: isa
hash: self];
/* Update bitcount */
t = bits[0];
if ((bits[0] = t + ((uint32_t)length << 3)) < t)
/* Carry from low to high */
bits[1]++;
bits[1] += (uint32_t)length >> 29;
/* Bytes already in shsInfo->data */
t = (t >> 3) & 0x3F;
/* Handle any leading odd-sized chunks */
if (t) {
uint8_t *p = in.u8 + t;
t = 64 - t;
if (length < t) {
memcpy(p, buffer_, length);
return;
}
memcpy(p, buffer_, t);
of_bswap32_vec_if_be(in.u32, 16);
md5_transform(buffer, in.u32);
buffer_ += t;
length -= t;
}
/* Process data in 64-byte chunks */
while (length >= 64) {
memcpy(in.u8, buffer_, 64);
of_bswap32_vec_if_be(in.u32, 16);
md5_transform(buffer, in.u32);
buffer_ += 64;
length -= 64;
}
/* Handle any remaining bytes of data. */
memcpy(in.u8, buffer_, length);
}
- (uint8_t*)digest
{
uint8_t *p;
size_t count;
if (calculated)
return (uint8_t*)buffer;
/* Compute number of bytes mod 64 */
count = (bits[0] >> 3) & 0x3F;
/*
* Set the first char of padding to 0x80. This is safe since there is
* always at least one byte free
*/
p = in.u8 + count;
*p++ = 0x80;
/* Bytes of padding needed to make 64 bytes */
count = 64 - 1 - count;
/* Pad out to 56 mod 64 */
if (count < 8) {
/* Two lots of padding: Pad the first block to 64 bytes */
memset(p, 0, count);
of_bswap32_vec_if_be(in.u32, 16);
md5_transform(buffer, in.u32);
/* Now fill the next block with 56 bytes */
memset(in.u8, 0, 56);
} else {
/* Pad block to 56 bytes */
memset(p, 0, count - 8);
}
of_bswap32_vec_if_be(in.u32, 14);
/* Append length in bits and transform */
in.u32[14] = bits[0];
in.u32[15] = bits[1];
md5_transform(buffer, in.u32);
of_bswap32_vec_if_be(buffer, 4);
calculated = YES;
return (uint8_t*)buffer;
}
@end