/* md5.c,v 3.1 1993/07/06 01:08:29 jbj Exp *********************************************************************** ** md5.c -- the source code for MD5 routines ** ** RSA Data Security, Inc. MD5 Message-Digest Algorithm ** ** Created: 2/17/90 RLR ** ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version ** ** Revised (for MD5): RLR 4/27/91 ** ** -- G modified to have y&~z instead of y&z ** ** -- FF, GG, HH modified to add in last register done ** ** -- Access pattern: round 2 works mod 5, round 3 works mod 3 ** ** -- distinct additive constant for each step ** ** -- round 4 added, working mod 7 ** *********************************************************************** */ /* *********************************************************************** ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** ** ** ** License to copy and use this software is granted provided that ** ** it is identified as the "RSA Data Security, Inc. MD5 Message- ** ** Digest Algorithm" in all material mentioning or referencing this ** ** software or this function. ** ** ** ** License is also granted to make and use derivative works ** ** provided that such works are identified as "derived from the RSA ** ** Data Security, Inc. MD5 Message-Digest Algorithm" in all ** ** material mentioning or referencing the derived work. ** ** ** ** RSA Data Security, Inc. makes no representations concerning ** ** either the merchantability of this software or the suitability ** ** of this software for any particular purpose. It is provided "as ** ** is" without express or implied warranty of any kind. ** ** ** ** These notices must be retained in any copies of any part of this ** ** documentation and/or software. ** *********************************************************************** */ #include "md5.h" /* *********************************************************************** ** Message-digest routines: ** ** To form the message digest for a message M ** ** (1) Initialize a context buffer mdContext using MD5Init ** ** (2) Call MD5Update on mdContext and M ** ** (3) Call MD5Final on mdContext ** ** The message digest is now in mdContext->digest[0...15] ** *********************************************************************** */ /* forward declaration */ static void Transform (); #ifdef __STDC__ static const #else static #endif unsigned char PADDING[64] = { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; /* F, G, H and I are basic MD5 functions */ #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) #define H(x, y, z) ((x) ^ (y) ^ (z)) #define I(x, y, z) ((y) ^ ((x) | (~z))) /* ROTATE_LEFT rotates x left n bits */ #if defined(FAST_MD5) && defined(__GNUC__) && defined(mc68000) /* * If we're on a 68000 based CPU and using a GNU C compiler with * inline assembly code, we can speed this up a bit. */ inline UINT4 ROTATE_LEFT(UINT4 x, int n) { asm("roll %2,%0" : "=d" (x) : "0" (x), "Ir" (n)); return x; } #else #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) #endif /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */ /* Rotation is separate from addition to prevent recomputation */ #define FF(a, b, c, d, x, s, ac) \ {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \ } #define GG(a, b, c, d, x, s, ac) \ {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \ } #define HH(a, b, c, d, x, s, ac) \ {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \ } #define II(a, b, c, d, x, s, ac) \ {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \ } /* The routine MD5Init initializes the message-digest context mdContext. All fields are set to zero. */ void MD5Init (mdContext) MD5_CTX *mdContext; { mdContext->i[0] = mdContext->i[1] = (UINT4)0; /* Load magic initialization constants. */ mdContext->buf[0] = (UINT4)0x67452301; mdContext->buf[1] = (UINT4)0xefcdab89; mdContext->buf[2] = (UINT4)0x98badcfe; mdContext->buf[3] = (UINT4)0x10325476; } /* The routine MD5Update updates the message-digest context to account for the presence of each of the characters inBuf[0..inLen-1] in the message whose digest is being computed. */ void MD5Update (mdContext, inBuf, inLen) MD5_CTX *mdContext; unsigned char *inBuf; unsigned int inLen; { UINT4 in[16]; int mdi; unsigned int i, ii; /* compute number of bytes mod 64 */ mdi = (int)((mdContext->i[0] >> 3) & 0x3F); /* update number of bits */ if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0]) mdContext->i[1]++; mdContext->i[0] += ((UINT4)inLen << 3); mdContext->i[1] += ((UINT4)inLen >> 29); while (inLen--) { /* add new character to buffer, increment mdi */ mdContext->in[mdi++] = *inBuf++; /* transform if necessary */ if (mdi == 0x40) { for (i = 0, ii = 0; i < 16; i++, ii += 4) in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | (((UINT4)mdContext->in[ii+2]) << 16) | (((UINT4)mdContext->in[ii+1]) << 8) | ((UINT4)mdContext->in[ii]); Transform (mdContext->buf, in); mdi = 0; } } } /* The routine MD5Final terminates the message-digest computation and ends with the desired message digest in mdContext->digest[0...15]. */ void MD5Final (mdContext) MD5_CTX *mdContext; { UINT4 in[16]; int mdi; unsigned int i, ii; unsigned int padLen; /* save number of bits */ in[14] = mdContext->i[0]; in[15] = mdContext->i[1]; /* compute number of bytes mod 64 */ mdi = (int)((mdContext->i[0] >> 3) & 0x3F); /* pad out to 56 mod 64 */ padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi); MD5Update (mdContext, PADDING, padLen); /* append length in bits and transform */ for (i = 0, ii = 0; i < 14; i++, ii += 4) in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | (((UINT4)mdContext->in[ii+2]) << 16) | (((UINT4)mdContext->in[ii+1]) << 8) | ((UINT4)mdContext->in[ii]); Transform (mdContext->buf, in); /* store buffer in digest */ for (i = 0, ii = 0; i < 4; i++, ii += 4) { mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF); mdContext->digest[ii+1] = (unsigned char)((mdContext->buf[i] >> 8) & 0xFF); mdContext->digest[ii+2] = (unsigned char)((mdContext->buf[i] >> 16) & 0xFF); mdContext->digest[ii+3] = (unsigned char)((mdContext->buf[i] >> 24) & 0xFF); } } /* Basic MD5 step. Transforms buf based on in. */ static void Transform (buf, in) UINT4 *buf; UINT4 *in; { UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3]; /* Round 1 */ #define S11 7 #define S12 12 #define S13 17 #define S14 22 FF ( a, b, c, d, in[ 0], S11, 0xd76aa478); /* 1 */ FF ( d, a, b, c, in[ 1], S12, 0xe8c7b756); /* 2 */ FF ( c, d, a, b, in[ 2], S13, 0x242070db); /* 3 */ FF ( b, c, d, a, in[ 3], S14, 0xc1bdceee); /* 4 */ FF ( a, b, c, d, in[ 4], S11, 0xf57c0faf); /* 5 */ FF ( d, a, b, c, in[ 5], S12, 0x4787c62a); /* 6 */ FF ( c, d, a, b, in[ 6], S13, 0xa8304613); /* 7 */ FF ( b, c, d, a, in[ 7], S14, 0xfd469501); /* 8 */ FF ( a, b, c, d, in[ 8], S11, 0x698098d8); /* 9 */ FF ( d, a, b, c, in[ 9], S12, 0x8b44f7af); /* 10 */ FF ( c, d, a, b, in[10], S13, 0xffff5bb1); /* 11 */ FF ( b, c, d, a, in[11], S14, 0x895cd7be); /* 12 */ FF ( a, b, c, d, in[12], S11, 0x6b901122); /* 13 */ FF ( d, a, b, c, in[13], S12, 0xfd987193); /* 14 */ FF ( c, d, a, b, in[14], S13, 0xa679438e); /* 15 */ FF ( b, c, d, a, in[15], S14, 0x49b40821); /* 16 */ /* Round 2 */ #define S21 5 #define S22 9 #define S23 14 #define S24 20 GG ( a, b, c, d, in[ 1], S21, 0xf61e2562); /* 17 */ GG ( d, a, b, c, in[ 6], S22, 0xc040b340); /* 18 */ GG ( c, d, a, b, in[11], S23, 0x265e5a51); /* 19 */ GG ( b, c, d, a, in[ 0], S24, 0xe9b6c7aa); /* 20 */ GG ( a, b, c, d, in[ 5], S21, 0xd62f105d); /* 21 */ GG ( d, a, b, c, in[10], S22, 0x2441453); /* 22 */ GG ( c, d, a, b, in[15], S23, 0xd8a1e681); /* 23 */ GG ( b, c, d, a, in[ 4], S24, 0xe7d3fbc8); /* 24 */ GG ( a, b, c, d, in[ 9], S21, 0x21e1cde6); /* 25 */ GG ( d, a, b, c, in[14], S22, 0xc33707d6); /* 26 */ GG ( c, d, a, b, in[ 3], S23, 0xf4d50d87); /* 27 */ GG ( b, c, d, a, in[ 8], S24, 0x455a14ed); /* 28 */ GG ( a, b, c, d, in[13], S21, 0xa9e3e905); /* 29 */ GG ( d, a, b, c, in[ 2], S22, 0xfcefa3f8); /* 30 */ GG ( c, d, a, b, in[ 7], S23, 0x676f02d9); /* 31 */ GG ( b, c, d, a, in[12], S24, 0x8d2a4c8a); /* 32 */ /* Round 3 */ #define S31 4 #define S32 11 #define S33 16 #define S34 23 HH ( a, b, c, d, in[ 5], S31, 0xfffa3942); /* 33 */ HH ( d, a, b, c, in[ 8], S32, 0x8771f681); /* 34 */ HH ( c, d, a, b, in[11], S33, 0x6d9d6122); /* 35 */ HH ( b, c, d, a, in[14], S34, 0xfde5380c); /* 36 */ HH ( a, b, c, d, in[ 1], S31, 0xa4beea44); /* 37 */ HH ( d, a, b, c, in[ 4], S32, 0x4bdecfa9); /* 38 */ HH ( c, d, a, b, in[ 7], S33, 0xf6bb4b60); /* 39 */ HH ( b, c, d, a, in[10], S34, 0xbebfbc70); /* 40 */ HH ( a, b, c, d, in[13], S31, 0x289b7ec6); /* 41 */ HH ( d, a, b, c, in[ 0], S32, 0xeaa127fa); /* 42 */ HH ( c, d, a, b, in[ 3], S33, 0xd4ef3085); /* 43 */ HH ( b, c, d, a, in[ 6], S34, 0x4881d05); /* 44 */ HH ( a, b, c, d, in[ 9], S31, 0xd9d4d039); /* 45 */ HH ( d, a, b, c, in[12], S32, 0xe6db99e5); /* 46 */ HH ( c, d, a, b, in[15], S33, 0x1fa27cf8); /* 47 */ HH ( b, c, d, a, in[ 2], S34, 0xc4ac5665); /* 48 */ /* Round 4 */ #define S41 6 #define S42 10 #define S43 15 #define S44 21 II ( a, b, c, d, in[ 0], S41, 0xf4292244); /* 49 */ II ( d, a, b, c, in[ 7], S42, 0x432aff97); /* 50 */ II ( c, d, a, b, in[14], S43, 0xab9423a7); /* 51 */ II ( b, c, d, a, in[ 5], S44, 0xfc93a039); /* 52 */ II ( a, b, c, d, in[12], S41, 0x655b59c3); /* 53 */ II ( d, a, b, c, in[ 3], S42, 0x8f0ccc92); /* 54 */ II ( c, d, a, b, in[10], S43, 0xffeff47d); /* 55 */ II ( b, c, d, a, in[ 1], S44, 0x85845dd1); /* 56 */ II ( a, b, c, d, in[ 8], S41, 0x6fa87e4f); /* 57 */ II ( d, a, b, c, in[15], S42, 0xfe2ce6e0); /* 58 */ II ( c, d, a, b, in[ 6], S43, 0xa3014314); /* 59 */ II ( b, c, d, a, in[13], S44, 0x4e0811a1); /* 60 */ II ( a, b, c, d, in[ 4], S41, 0xf7537e82); /* 61 */ II ( d, a, b, c, in[11], S42, 0xbd3af235); /* 62 */ II ( c, d, a, b, in[ 2], S43, 0x2ad7d2bb); /* 63 */ II ( b, c, d, a, in[ 9], S44, 0xeb86d391); /* 64 */ buf[0] += a; buf[1] += b; buf[2] += c; buf[3] += d; } /* *********************************************************************** ** End of md5.c ** ******************************** (cut) ******************************** */