131 lines
5.1 KiB
C
131 lines
5.1 KiB
C
/*----------------------------------------------------------------------------
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;
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; MD5 hash generator -- Paul Houle (paulhoule.com) 11/13/2017
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;
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; Called only from phmd5.c -- see phmd5.h for overview
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;
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; This is the same logic in phmd5a.asm, implemented (after the fact) in C.
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; The C compiler must support the "_rotl()" function generated inline to
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; achieve maximal performance.
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;
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; It turns out the MSFT C compiler, coupled with newer processor, results
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; in timings comparable to the 32-bit only phmd5a.asm hand-written assembly.
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; Therefore this "C" implementation is now used.
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; Avoiding assembly allows the code to be compiled either 32 or 64 bit.
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;
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; Note that a "little-endian" memory architecture is assumed.
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;
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; The Fx() and MD5STEP() macros were written by Colin Plumb in 1993.
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; MD5STEP() was changed slightly to match how phmd5a.asm operates.
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;
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;---------------------------------------------------------------------------*/
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#include <stdlib.h> // for _rotl()
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#include "phmd5.h"
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// MD5 Optimisation Tricks by Anime Tosho
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// https://github.com/animetosho/md5-optimisation#optimisation-tricks-single-buffer
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// Dependency shortcut in G function
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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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#define MD5STEP(f, w, x, y, z, ix, s, sc) \
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w = _rotl(w + f(x, y, z) + ((unsigned *) pdata)[ix] + sc, s) + x
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void Phmd5DoBlocks(
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unsigned char *hash,
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char *pdata,
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size_t bytecnt
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) {
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unsigned __int32 a = *(unsigned __int32 *) &hash[ 0];
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unsigned __int32 b = *(unsigned __int32 *) &hash[ 4];
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unsigned __int32 c = *(unsigned __int32 *) &hash[ 8];
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unsigned __int32 d = *(unsigned __int32 *) &hash[12];
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do {
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MD5STEP(F1, a, b, c, d, 0, 7, 0xd76aa478);
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MD5STEP(F1, d, a, b, c, 1, 12, 0xe8c7b756);
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MD5STEP(F1, c, d, a, b, 2, 17, 0x242070db);
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MD5STEP(F1, b, c, d, a, 3, 22, 0xc1bdceee);
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MD5STEP(F1, a, b, c, d, 4, 7, 0xf57c0faf);
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MD5STEP(F1, d, a, b, c, 5, 12, 0x4787c62a);
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MD5STEP(F1, c, d, a, b, 6, 17, 0xa8304613);
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MD5STEP(F1, b, c, d, a, 7, 22, 0xfd469501);
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MD5STEP(F1, a, b, c, d, 8, 7, 0x698098d8);
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MD5STEP(F1, d, a, b, c, 9, 12, 0x8b44f7af);
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MD5STEP(F1, c, d, a, b, 10, 17, 0xffff5bb1);
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MD5STEP(F1, b, c, d, a, 11, 22, 0x895cd7be);
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MD5STEP(F1, a, b, c, d, 12, 7, 0x6b901122);
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MD5STEP(F1, d, a, b, c, 13, 12, 0xfd987193);
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MD5STEP(F1, c, d, a, b, 14, 17, 0xa679438e);
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MD5STEP(F1, b, c, d, a, 15, 22, 0x49b40821);
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MD5STEP(F2, a, b, c, d, 1, 5, 0xf61e2562);
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MD5STEP(F2, d, a, b, c, 6, 9, 0xc040b340);
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MD5STEP(F2, c, d, a, b, 11, 14, 0x265e5a51);
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MD5STEP(F2, b, c, d, a, 0, 20, 0xe9b6c7aa);
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MD5STEP(F2, a, b, c, d, 5, 5, 0xd62f105d);
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MD5STEP(F2, d, a, b, c, 10, 9, 0x02441453);
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MD5STEP(F2, c, d, a, b, 15, 14, 0xd8a1e681);
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MD5STEP(F2, b, c, d, a, 4, 20, 0xe7d3fbc8);
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MD5STEP(F2, a, b, c, d, 9, 5, 0x21e1cde6);
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MD5STEP(F2, d, a, b, c, 14, 9, 0xc33707d6);
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MD5STEP(F2, c, d, a, b, 3, 14, 0xf4d50d87);
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MD5STEP(F2, b, c, d, a, 8, 20, 0x455a14ed);
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MD5STEP(F2, a, b, c, d, 13, 5, 0xa9e3e905);
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MD5STEP(F2, d, a, b, c, 2, 9, 0xfcefa3f8);
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MD5STEP(F2, c, d, a, b, 7, 14, 0x676f02d9);
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MD5STEP(F2, b, c, d, a, 12, 20, 0x8d2a4c8a);
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MD5STEP(F3, a, b, c, d, 5, 4, 0xfffa3942);
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MD5STEP(F3, d, a, b, c, 8, 11, 0x8771f681);
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MD5STEP(F3, c, d, a, b, 11, 16, 0x6d9d6122);
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MD5STEP(F3, b, c, d, a, 14, 23, 0xfde5380c);
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MD5STEP(F3, a, b, c, d, 1, 4, 0xa4beea44);
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MD5STEP(F3, d, a, b, c, 4, 11, 0x4bdecfa9);
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MD5STEP(F3, c, d, a, b, 7, 16, 0xf6bb4b60);
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MD5STEP(F3, b, c, d, a, 10, 23, 0xbebfbc70);
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MD5STEP(F3, a, b, c, d, 13, 4, 0x289b7ec6);
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MD5STEP(F3, d, a, b, c, 0, 11, 0xeaa127fa);
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MD5STEP(F3, c, d, a, b, 3, 16, 0xd4ef3085);
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MD5STEP(F3, b, c, d, a, 6, 23, 0x04881d05);
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MD5STEP(F3, a, b, c, d, 9, 4, 0xd9d4d039);
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MD5STEP(F3, d, a, b, c, 12, 11, 0xe6db99e5);
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MD5STEP(F3, c, d, a, b, 15, 16, 0x1fa27cf8);
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MD5STEP(F3, b, c, d, a, 2, 23, 0xc4ac5665);
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MD5STEP(F4, a, b, c, d, 0, 6, 0xf4292244);
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MD5STEP(F4, d, a, b, c, 7, 10, 0x432aff97);
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MD5STEP(F4, c, d, a, b, 14, 15, 0xab9423a7);
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MD5STEP(F4, b, c, d, a, 5, 21, 0xfc93a039);
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MD5STEP(F4, a, b, c, d, 12, 6, 0x655b59c3);
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MD5STEP(F4, d, a, b, c, 3, 10, 0x8f0ccc92);
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MD5STEP(F4, c, d, a, b, 10, 15, 0xffeff47d);
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MD5STEP(F4, b, c, d, a, 1, 21, 0x85845dd1);
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MD5STEP(F4, a, b, c, d, 8, 6, 0x6fa87e4f);
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MD5STEP(F4, d, a, b, c, 15, 10, 0xfe2ce6e0);
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MD5STEP(F4, c, d, a, b, 6, 15, 0xa3014314);
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MD5STEP(F4, b, c, d, a, 13, 21, 0x4e0811a1);
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MD5STEP(F4, a, b, c, d, 4, 6, 0xf7537e82);
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MD5STEP(F4, d, a, b, c, 11, 10, 0xbd3af235);
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MD5STEP(F4, c, d, a, b, 2, 15, 0x2ad7d2bb);
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MD5STEP(F4, b, c, d, a, 9, 21, 0xeb86d391);
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a += *(unsigned __int32 *) &hash[ 0];
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b += *(unsigned __int32 *) &hash[ 4];
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c += *(unsigned __int32 *) &hash[ 8];
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d += *(unsigned __int32 *) &hash[12];
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*(unsigned __int32 *) &hash[ 0] = a;
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*(unsigned __int32 *) &hash[ 4] = b;
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*(unsigned __int32 *) &hash[ 8] = c;
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*(unsigned __int32 *) &hash[12] = d;
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pdata += 64;
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} while (bytecnt -= 64);
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}
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