iofbird / bird2.0.1 / lib / md5.c @ 6b3f1a54
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/*


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* BIRD Library  MD5 Hash Function and HMACMD5 Function

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*

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* (c) 2015 CZ.NIC z.s.p.o.

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*

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* The code was written by Colin Plumb in 1993, no copyright is claimed.

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*

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* Adapted for BIRD by Martin Mares <mj@ucw.cz>

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*

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* Can be freely distributed and used under the terms of the GNU GPL.

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*/

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#include "lib/md5.h" 
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#ifdef CPU_LITTLE_ENDIAN

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#define byteReverse(buf, len) /* Nothing */ 
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#else

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void byteReverse(byte *buf, uint longs);

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/*

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* Note: this code is harmless on littleendian machines.

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*/

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void byteReverse(byte *buf, uint longs)

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{ 
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u32 t; 
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do {

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t = (u32) ((uint) buf[3] << 8  buf[2]) << 16  
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((uint) buf[1] << 8  buf[0]); 
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*(u32 *) buf = t; 
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buf += 4;

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} while (longs);

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} 
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#endif

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static void md5_transform(u32 buf[4], u32 const 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

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md5_init(struct hash_context *CTX)

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{ 
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struct md5_context *ctx = (void *) CTX; 
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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>bits[0] = 0; 
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ctx>bits[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

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md5_update(struct hash_context *CTX, const byte *buf, uint len) 
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{ 
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struct md5_context *ctx = (void *) CTX; 
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u32 t; 
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/* Update bitcount */

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t = ctx>bits[0];

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if ((ctx>bits[0] = t + ((u32) len << 3)) < t) 
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ctx>bits[1]++; /* Carry from low to high */ 
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ctx>bits[1] += len >> 29; 
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t = (t >> 3) & 0x3f; /* Bytes already in shsInfo>data */ 
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/* Handle any leading oddsized chunks */

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if (t)

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{ 
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byte *p = (byte *) 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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md5_transform(ctx>buf, (u32 *) 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 64byte 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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md5_transform(ctx>buf, (u32 *) 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 64byte boundary with the bit pattern

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* 1 0* (64bit count of bits processed, MSBfirst)

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*/

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byte * 
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md5_final(struct hash_context *CTX)

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{ 
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struct md5_context *ctx = (void *) CTX; 
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uint count; 
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byte *p; 
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/* Compute number of bytes mod 64 */

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count = (ctx>bits[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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md5_transform(ctx>buf, (u32 *) 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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((u32 *) ctx>in)[14] = ctx>bits[0]; 
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((u32 *) ctx>in)[15] = ctx>bits[1]; 
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md5_transform(ctx>buf, (u32 *) ctx>in); 
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byteReverse((byte *) ctx>buf, 4);

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return (byte*) ctx>buf;

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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>>(32s), 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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void

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md5_transform(u32 buf[4], u32 const in[16]) 
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{ 
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register u32 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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} 