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256 lines
8.5 KiB
C
256 lines
8.5 KiB
C
/*
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* Copyright (C) 2001 Nikos Mavroyanopoulos
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* Copyright (C) 2004 Hans Leidekker
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/*
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* This code implements the MD5 message-digest algorithm.
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* It is based on code in the public domain written by Colin
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* Plumb in 1993. The algorithm is due to Ron Rivest.
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*
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* Equivalent code is available from RSA Data Security, Inc.
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* This code has been tested against that, and is equivalent,
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* except that you don't need to include two pages of legalese
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* with every copy.
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*
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* To compute the message digest of a chunk of bytes, declare an
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* MD5_CTX structure, pass it to MD5Init, call MD5Update as
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* needed on buffers full of bytes, and then call MD5Final, which
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* will fill a supplied 16-byte array with the digest.
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*/
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#include "md5.h"
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#include "util.h"
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static void MD5Transform( unsigned int buf[4], const unsigned int in[16] );
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/*
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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 NTAPI MD5Init( MD5_CTX *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->i[0] = ctx->i[1] = 0;
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}
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/*
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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 NTAPI MD5Update( MD5_CTX *ctx, const unsigned char *buf, unsigned int len )
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{
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register unsigned int t;
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/* Update bitcount */
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t = ctx->i[0];
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if ((ctx->i[0] = t + (len << 3)) < t)
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ctx->i[1]++; /* Carry from low to high */
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ctx->i[1] += len >> 29;
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t = (t >> 3) & 0x3f;
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/* Handle any leading odd-sized chunks */
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if (t)
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{
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unsigned char *p = (unsigned char *)ctx->in + t;
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t = 64 - t;
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if (len < t)
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{
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memcpy( p, buf, len );
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return;
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}
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memcpy( p, buf, t );
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byteReverse( ctx->in, 16 );
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MD5Transform( ctx->buf, (unsigned int *)ctx->in );
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buf += t;
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len -= t;
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}
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/* Process data in 64-byte chunks */
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while (len >= 64)
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{
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memcpy( ctx->in, buf, 64 );
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byteReverse( ctx->in, 16 );
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MD5Transform( ctx->buf, (unsigned int *)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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/*
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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 NTAPI MD5Final( MD5_CTX *ctx )
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{
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unsigned int count;
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unsigned char *p;
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/* Compute number of bytes mod 64 */
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count = (ctx->i[0] >> 3) & 0x3F;
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/* Set the first char of padding to 0x80. This is safe since there is
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always at least one byte free */
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p = ctx->in + count;
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*p++ = 0x80;
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/* Bytes of padding needed to make 64 bytes */
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count = 64 - 1 - count;
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/* Pad out to 56 mod 64 */
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if (count < 8)
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{
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/* Two lots of padding: Pad the first block to 64 bytes */
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memset( p, 0, count );
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byteReverse( ctx->in, 16 );
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MD5Transform( ctx->buf, (unsigned int *)ctx->in );
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/* Now fill the next block with 56 bytes */
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memset( ctx->in, 0, 56 );
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}
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else
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{
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/* Pad block to 56 bytes */
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memset( p, 0, count - 8 );
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}
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byteReverse( ctx->in, 14 );
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/* Append length in bits and transform */
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((unsigned int *)ctx->in)[14] = ctx->i[0];
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((unsigned int *)ctx->in)[15] = ctx->i[1];
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MD5Transform( ctx->buf, (unsigned int *)ctx->in );
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byteReverse( (unsigned char *)ctx->buf, 4 );
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memcpy( ctx->digest, ctx->buf, 16 );
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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, data, s ) \
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( w += f( x, y, z ) + data, w = w << s | w >> (32 - s), w += x )
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/*
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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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static void MD5Transform( unsigned int buf[4], const unsigned int in[16] )
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{
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register unsigned int 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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