278 lines
8.8 KiB
C
Executable File
278 lines
8.8 KiB
C
Executable File
/*
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* Copyright (C) 2010-2011 Mamadou Diop.
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*
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* Contact: Mamadou Diop <diopmamadou(at)doubango[dot]org>
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*
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* This file is part of Open Source Doubango Framework.
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*
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* DOUBANGO is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DOUBANGO is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with DOUBANGO.
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*
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*/
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/**@file tsk_md5.c
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* @brief Implements Message-Digest algorithm 5 (RFC 1321).
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*
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* @author Colin Plumb
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* @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
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*
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*/
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#include "tsk_md5.h"
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#include "tsk_string.h"
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#include <string.h>
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/**@defgroup tsk_md5_group MD5 (RFC 1321) utility functions.
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* The code in this file is a modified version of an implementation placed in the public domain by the following persons:
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* @author Colin Plumb
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* @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
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*/
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/**@ingroup tsk_md5_group
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*/
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#if defined(_BIG_ENDIAN)
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void tsk_byteReverse(uint32_t *buf, unsigned words)
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{
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uint8_t *p = (uint8_t *)buf;
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do {
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*buf++ = (uint32_t)((unsigned)p[3] << 8 | p[2]) << 16 |
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((unsigned)p[1] << 8 | p[0]);
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p += 4;
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}
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while (--words);
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}
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#else
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#define tsk_byteReverse(buf,words) /* do nothing*/
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#endif
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/**@ingroup tsk_md5_group
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* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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* initialization constants.
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*/
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void tsk_md5init(tsk_md5context_t *ctx)
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{
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ctx->buf[0] = 0x67452301;
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ctx->buf[1] = 0xefcdab89;
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ctx->buf[2] = 0x98badcfe;
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ctx->buf[3] = 0x10325476;
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ctx->bytes[0] = 0;
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ctx->bytes[1] = 0;
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}
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/**@ingroup tsk_md5_group
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* Update context to reflect the concatenation of another buffer full
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* of bytes.
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*/
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void tsk_md5update(tsk_md5context_t *ctx, uint8_t const *buf, tsk_size_t len)
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{
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uint32_t t;
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/* Update byte count */
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t = ctx->bytes[0];
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if ((ctx->bytes[0] = t + (uint32_t)len) < t) {
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ctx->bytes[1]++; /* Carry from low to high */
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}
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t = 64 - (t & 0x3f); /* Space available in ctx->in (at least 1) */
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if (t > len) {
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memcpy((uint8_t *)ctx->in + 64 - t, buf, len);
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return ;
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}
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/* First chunk is an odd size */
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memcpy((uint8_t *)ctx->in + 64 - t, buf, t);
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tsk_byteReverse(ctx->in, 16);
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tsk_md5transform(ctx->buf, ctx->in);
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buf += t;
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len -= t;
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/* Process data in 64-byte chunks */
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while (len >= 64) {
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memcpy(ctx->in, buf, 64);
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tsk_byteReverse(ctx->in, 16);
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tsk_md5transform(ctx->buf, ctx->in);
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buf += 64;
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len -= 64;
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}
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/* Handle any remaining bytes of data. */
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memcpy(ctx->in, buf, len);
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}
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/**@ingroup tsk_md5_group
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* Final wrapup - pad to 64-byte boundary with the bit pattern
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* 1 0* (64-bit count of bits processed, MSB-first)
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*/
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void tsk_md5final(tsk_md5digest_t digest, tsk_md5context_t *ctx)
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{
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int count = ctx->bytes[0] & 0x3f; /* Number of bytes in ctx->in */
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uint8_t *p = (uint8_t *)ctx->in + count;
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/* Set the first char of padding to 0x80. There is always room. */
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*p++ = 0x80;
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/* Bytes of padding needed to make 56 bytes (-8..55) */
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count = 56 - 1 - count;
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if (count < 0) {
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/* Padding forces an extra block */
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memset(p, 0, count + 8);
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tsk_byteReverse(ctx->in, 16);
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tsk_md5transform(ctx->buf, ctx->in);
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p = (uint8_t *)ctx->in;
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count = 56;
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}
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memset(p, 0, count);
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tsk_byteReverse(ctx->in, 14);
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/* Append length in bits and transform */
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ctx->in[14] = ctx->bytes[0] << 3;
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ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
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tsk_md5transform(ctx->buf, ctx->in);
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tsk_byteReverse(ctx->buf, 4);
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memcpy(digest, ctx->buf, 16);
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memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
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}
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/* The four core functions - F1 is optimized somewhat */
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/* #define F1(x, y, z) (x & y | ~x & z) */
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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/* This is the central step in the MD5 algorithm. */
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#define MD5STEP(f,w,x,y,z,in,s) \
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(w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)
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/**@ingroup tsk_md5_group
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* The core of the MD5 algorithm, this alters an existing MD5 hash to
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* reflect the addition of 16 longwords of new data. MD5Update blocks
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* the data and converts bytes into longwords for this routine.
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*/
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void tsk_md5transform(uint32_t buf[4], uint32_t const in[TSK_MD5_DIGEST_SIZE])
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{
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register uint32_t a, b, c, d;
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a = buf[0];
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b = buf[1];
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c = buf[2];
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d = buf[3];
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MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
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MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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/**@ingroup tsk_md5_group
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*
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* @brief Calculate MD5 HASH for @a input data.
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*
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* @param input The input data.
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* @param size The size of the input data.
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* @param result MD5 hash result as Hexadecimal string.
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*
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* @return Zero if succeed and non-zero error code otherwise.
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**/
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int tsk_md5compute(const char* input, tsk_size_t size, tsk_md5string_t *result)
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{
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tsk_md5digest_t digest;
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if(!result | !*result) {
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return -1;
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}
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(*result)[TSK_MD5_STRING_SIZE] = '\0';
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TSK_MD5_DIGEST_CALC(input, size, digest);
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tsk_str_from_hex(digest, TSK_MD5_DIGEST_SIZE, *result);
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return 0;
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}
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