/* * cook - file construction tool * Copyright (C) 1994, 1995, 1999 Peter Miller; * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. * * MANIFEST: functions to manipulate md5 fingerprints * * Derived from code marked * derived from RSADSI MD5 Message-Digest Algorithm * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. * 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 #include #include #include #define MD5_HASH_LEN 16 typedef struct md5_ty md5_ty; struct md5_ty { FINGERPRINT_BASE_CLASS unsigned long state[4]; unsigned long count[2]; unsigned char buffer[64]; }; /* * Constants for MD5Transform routine. */ #define S11 7 #define S12 12 #define S13 17 #define S14 22 #define S21 5 #define S22 9 #define S23 14 #define S24 20 #define S31 4 #define S32 11 #define S33 16 #define S34 23 #define S41 6 #define S42 10 #define S43 15 #define S44 21 static unsigned char PADDING[64] = { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; /* * 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. */ #define ROTATE_LEFT(x, n) ((uint32)((x) << (n)) | ((uint32)(x) >> (32 - (n)))) /* * 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) \ do { \ (a) += F((b), (c), (d)) + (x) + (unsigned long)(ac); \ (a) = ROTATE_LEFT((a), (s)); \ (a) += (b); \ } while(0) #define GG(a, b, c, d, x, s, ac) \ do { \ (a) += G((b), (c), (d)) + (x) + (unsigned long)(ac); \ (a) = ROTATE_LEFT((a), (s)); \ (a) += (b); \ } while(0) #define HH(a, b, c, d, x, s, ac) \ do { \ (a) += H((b), (c), (d)) + (x) + (unsigned long)(ac); \ (a) = ROTATE_LEFT((a), (s)); \ (a) += (b); \ } while(0) #define II(a, b, c, d, x, s, ac) \ do { \ (a) += I((b), (c), (d)) + (x) + (unsigned long)(ac); \ (a) = ROTATE_LEFT((a), (s)); \ (a) += (b); \ } while(0) /* * MD5 initialization. Begins an MD5 operation, writing a new context. */ static void reset _((md5_ty *)); static void reset(context) md5_ty *context; { context->count[0] = 0; context->count[1] = 0; /* * Load magic initialization constants. */ context->state[0] = 0x67452301; context->state[1] = 0xefcdab89; context->state[2] = 0x98badcfe; context->state[3] = 0x10325476; } static void md5_constructor _((fingerprint_ty *)); static void md5_constructor(p) fingerprint_ty *p; { md5_ty *context; context = (md5_ty *)p; reset(context); } static void md5_destructor _((fingerprint_ty *)); static void md5_destructor(p) fingerprint_ty *p; { } /* * Encodes input (unsigned long) into output (unsigned char). * Assumes len is a multiple of 4. */ static void Encode _((unsigned char *, unsigned long *, unsigned int)); static void Encode(output, input, len) unsigned char *output; unsigned long *input; unsigned int len; { unsigned int i, j; for (i = 0, j = 0; j < len; i++, j += 4) { output[j] = (unsigned char)input[i]; output[j + 1] = (unsigned char)(input[i] >> 8); output[j + 2] = (unsigned char)(input[i] >> 16); output[j + 3] = (unsigned char)(input[i] >> 24); } } /* * Decodes input (unsigned char) into output (unsigned long). * Assumes len is a multiple of 4. */ static void Decode _((unsigned long *, unsigned char *, unsigned int)); static void Decode(output, input, len) unsigned long *output; unsigned char *input; unsigned int len; { unsigned int i, j; for (i = 0, j = 0; j < len; i++, j += 4) output[i] = ((unsigned long)input[j]) | (((unsigned long)input[j + 1]) << 8) | (((unsigned long)input[j + 2]) << 16) | (((unsigned long)input[j + 3]) << 24); } /* * MD5 basic transformation. Transforms state based on block. */ static void MD5Transform _((unsigned long state[4], unsigned char block[64])); static void MD5Transform(state, block) unsigned long state[4]; unsigned char block[64]; { unsigned long a = state[0], b = state[1], c = state[2], d = state[3], x[16]; Decode(x, block, 64); /* Round 1 */ FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */ FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */ FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */ FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */ FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */ FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */ FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */ FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */ FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */ FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */ FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ /* Round 2 */ GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */ GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */ GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */ GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */ GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */ GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */ GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */ GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */ GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */ GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */ GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */ GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ /* Round 3 */ HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */ HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */ HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */ HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */ HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */ HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */ HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */ HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */ HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */ HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */ /* Round 4 */ II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */ II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */ II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */ II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */ II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */ II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */ II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */ II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */ II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */ II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */ state[0] += a; state[1] += b; state[2] += c; state[3] += d; /* Reset sensitive information. */ memset(x, 0, sizeof(x)); } /* * MD5 block update operation. Continues an MD5 message-digest * operation, processing another message block, and updating the * context. */ static void md5_addn _((fingerprint_ty *, unsigned char *, int)); static void md5_addn(p, input, inputLen) fingerprint_ty *p; unsigned char *input; /* input block */ int inputLen; /* length of input block */ { md5_ty *context; unsigned int i; unsigned int idx; unsigned int partLen; context = (md5_ty *)p; /* Compute number of bytes mod 64 */ idx = (unsigned int)((context->count[0] >> 3) & 0x3F); /* Update number of bits */ if ( (context->count[0] += ((unsigned long)inputLen << 3)) < ((unsigned long)inputLen << 3) ) context->count[1]++; context->count[1] += ((unsigned long)inputLen >> 29); partLen = 64 - idx; /* * Transform as many times as possible. */ if (inputLen >= partLen) { memcpy(&context->buffer[idx], input, partLen); MD5Transform(context->state, context->buffer); for (i = partLen; i + 63 < inputLen; i += 64) MD5Transform(context->state, &input[i]); idx = 0; } else i = 0; /* Buffer remaining input */ memcpy(&context->buffer[idx], &input[i], inputLen - i); } /* * MD5 finalization. * Ends an MD5 message-digest operation, writing the message digest * and resetting the context. */ static int md5_hash _((fingerprint_ty *, unsigned char *)); static int md5_hash(p, digest) fingerprint_ty *p; unsigned char *digest; { md5_ty *context; unsigned char bits[8]; unsigned int idx; unsigned int padLen; /* * Save number of bits */ context = (md5_ty *)p; Encode(bits, context->count, 8); /* * Pad out to 56 mod 64. */ idx = (unsigned int)((context->count[0] >> 3) & 0x3f); padLen = (idx < 56) ? (56 - idx) : (120 - idx); md5_addn(p, PADDING, padLen); /* * Append length (before padding) */ md5_addn(p, bits, 8); /* * Store state in digest */ Encode(digest, context->state, 16); /* * reset sensitive information. */ reset(context); /* * return length of hash */ return MD5_HASH_LEN; } static void md5_sum _((fingerprint_ty *, char *)); static void md5_sum(p, obuf) fingerprint_ty *p; char *obuf; { md5_ty *context; unsigned char h[MD5_HASH_LEN]; char *cp; int i; context = (md5_ty *)p; md5_hash(p, h); cp = obuf; for (i = 0; i < MD5_HASH_LEN; ++i) { sprintf(cp, "%2.2X", h[i]); cp += 2; } *cp = 0; } fingerprint_methods_ty fp_md5 = { sizeof(md5_ty), "md5", md5_constructor, md5_destructor, md5_addn, md5_hash, md5_sum };