1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm 2 * $FreeBSD: src/sys/kern/md4c.c,v 1.1.2.1 2001/05/22 08:32:32 bp Exp $ 3 * $DragonFly: src/sys/kern/md4c.c,v 1.2 2003/06/17 04:28:41 dillon Exp $ 4 */ 5 6 /* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved. 7 8 License to copy and use this software is granted provided that it 9 is identified as the "RSA Data Security, Inc. MD4 Message-Digest 10 Algorithm" in all material mentioning or referencing this software 11 or this function. 12 13 License is also granted to make and use derivative works provided 14 that such works are identified as "derived from the RSA Data 15 Security, Inc. MD4 Message-Digest Algorithm" in all material 16 mentioning or referencing the derived work. 17 18 RSA Data Security, Inc. makes no representations concerning either 19 the merchantability of this software or the suitability of this 20 software for any particular purpose. It is provided "as is" 21 without express or implied warranty of any kind. 22 23 These notices must be retained in any copies of any part of this 24 documentation and/or software. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 #include <sys/md4.h> 30 31 typedef unsigned char *POINTER; 32 typedef u_int16_t UINT2; 33 typedef u_int32_t UINT4; 34 35 #define PROTO_LIST(list) list 36 37 /* Constants for MD4Transform routine. 38 */ 39 #define S11 3 40 #define S12 7 41 #define S13 11 42 #define S14 19 43 #define S21 3 44 #define S22 5 45 #define S23 9 46 #define S24 13 47 #define S31 3 48 #define S32 9 49 #define S33 11 50 #define S34 15 51 52 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64])); 53 static void Encode PROTO_LIST 54 ((unsigned char *, UINT4 *, unsigned int)); 55 static void Decode PROTO_LIST 56 ((UINT4 *, const unsigned char *, unsigned int)); 57 58 static unsigned char PADDING[64] = { 59 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 60 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 61 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 62 }; 63 64 /* F, G and H are basic MD4 functions. 65 */ 66 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 67 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) 68 #define H(x, y, z) ((x) ^ (y) ^ (z)) 69 70 /* ROTATE_LEFT rotates x left n bits. 71 */ 72 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 73 74 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */ 75 /* Rotation is separate from addition to prevent recomputation */ 76 #define FF(a, b, c, d, x, s) { \ 77 (a) += F ((b), (c), (d)) + (x); \ 78 (a) = ROTATE_LEFT ((a), (s)); \ 79 } 80 #define GG(a, b, c, d, x, s) { \ 81 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \ 82 (a) = ROTATE_LEFT ((a), (s)); \ 83 } 84 #define HH(a, b, c, d, x, s) { \ 85 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \ 86 (a) = ROTATE_LEFT ((a), (s)); \ 87 } 88 89 /* MD4 initialization. Begins an MD4 operation, writing a new context. 90 */ 91 void MD4Init (context) 92 MD4_CTX *context; /* context */ 93 { 94 context->count[0] = context->count[1] = 0; 95 96 /* Load magic initialization constants. 97 */ 98 context->state[0] = 0x67452301; 99 context->state[1] = 0xefcdab89; 100 context->state[2] = 0x98badcfe; 101 context->state[3] = 0x10325476; 102 } 103 104 /* MD4 block update operation. Continues an MD4 message-digest 105 operation, processing another message block, and updating the 106 context. 107 */ 108 void MD4Update (context, input, inputLen) 109 MD4_CTX *context; /* context */ 110 const unsigned char *input; /* input block */ 111 unsigned int inputLen; /* length of input block */ 112 { 113 unsigned int i, index, partLen; 114 115 /* Compute number of bytes mod 64 */ 116 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 117 /* Update number of bits */ 118 if ((context->count[0] += ((UINT4)inputLen << 3)) 119 < ((UINT4)inputLen << 3)) 120 context->count[1]++; 121 context->count[1] += ((UINT4)inputLen >> 29); 122 123 partLen = 64 - index; 124 /* Transform as many times as possible. 125 */ 126 if (inputLen >= partLen) { 127 bcopy(input, &context->buffer[index], partLen); 128 MD4Transform (context->state, context->buffer); 129 130 for (i = partLen; i + 63 < inputLen; i += 64) 131 MD4Transform (context->state, &input[i]); 132 133 index = 0; 134 } 135 else 136 i = 0; 137 138 /* Buffer remaining input */ 139 bcopy(&input[i], &context->buffer[index], inputLen-i); 140 } 141 142 /* MD4 padding. */ 143 void MD4Pad (context) 144 MD4_CTX *context; /* context */ 145 { 146 unsigned char bits[8]; 147 unsigned int index, padLen; 148 149 /* Save number of bits */ 150 Encode (bits, context->count, 8); 151 152 /* Pad out to 56 mod 64. 153 */ 154 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 155 padLen = (index < 56) ? (56 - index) : (120 - index); 156 MD4Update (context, PADDING, padLen); 157 158 /* Append length (before padding) */ 159 MD4Update (context, bits, 8); 160 } 161 162 /* MD4 finalization. Ends an MD4 message-digest operation, writing the 163 the message digest and zeroizing the context. 164 */ 165 void MD4Final (digest, context) 166 unsigned char digest[16]; /* message digest */ 167 MD4_CTX *context; /* context */ 168 { 169 /* Do padding */ 170 MD4Pad (context); 171 172 /* Store state in digest */ 173 Encode (digest, context->state, 16); 174 175 /* Zeroize sensitive information. 176 */ 177 bzero((POINTER)context, sizeof (*context)); 178 } 179 180 /* MD4 basic transformation. Transforms state based on block. 181 */ 182 static void MD4Transform (state, block) 183 UINT4 state[4]; 184 const unsigned char block[64]; 185 { 186 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 187 188 Decode (x, block, 64); 189 190 /* Round 1 */ 191 FF (a, b, c, d, x[ 0], S11); /* 1 */ 192 FF (d, a, b, c, x[ 1], S12); /* 2 */ 193 FF (c, d, a, b, x[ 2], S13); /* 3 */ 194 FF (b, c, d, a, x[ 3], S14); /* 4 */ 195 FF (a, b, c, d, x[ 4], S11); /* 5 */ 196 FF (d, a, b, c, x[ 5], S12); /* 6 */ 197 FF (c, d, a, b, x[ 6], S13); /* 7 */ 198 FF (b, c, d, a, x[ 7], S14); /* 8 */ 199 FF (a, b, c, d, x[ 8], S11); /* 9 */ 200 FF (d, a, b, c, x[ 9], S12); /* 10 */ 201 FF (c, d, a, b, x[10], S13); /* 11 */ 202 FF (b, c, d, a, x[11], S14); /* 12 */ 203 FF (a, b, c, d, x[12], S11); /* 13 */ 204 FF (d, a, b, c, x[13], S12); /* 14 */ 205 FF (c, d, a, b, x[14], S13); /* 15 */ 206 FF (b, c, d, a, x[15], S14); /* 16 */ 207 208 /* Round 2 */ 209 GG (a, b, c, d, x[ 0], S21); /* 17 */ 210 GG (d, a, b, c, x[ 4], S22); /* 18 */ 211 GG (c, d, a, b, x[ 8], S23); /* 19 */ 212 GG (b, c, d, a, x[12], S24); /* 20 */ 213 GG (a, b, c, d, x[ 1], S21); /* 21 */ 214 GG (d, a, b, c, x[ 5], S22); /* 22 */ 215 GG (c, d, a, b, x[ 9], S23); /* 23 */ 216 GG (b, c, d, a, x[13], S24); /* 24 */ 217 GG (a, b, c, d, x[ 2], S21); /* 25 */ 218 GG (d, a, b, c, x[ 6], S22); /* 26 */ 219 GG (c, d, a, b, x[10], S23); /* 27 */ 220 GG (b, c, d, a, x[14], S24); /* 28 */ 221 GG (a, b, c, d, x[ 3], S21); /* 29 */ 222 GG (d, a, b, c, x[ 7], S22); /* 30 */ 223 GG (c, d, a, b, x[11], S23); /* 31 */ 224 GG (b, c, d, a, x[15], S24); /* 32 */ 225 226 /* Round 3 */ 227 HH (a, b, c, d, x[ 0], S31); /* 33 */ 228 HH (d, a, b, c, x[ 8], S32); /* 34 */ 229 HH (c, d, a, b, x[ 4], S33); /* 35 */ 230 HH (b, c, d, a, x[12], S34); /* 36 */ 231 HH (a, b, c, d, x[ 2], S31); /* 37 */ 232 HH (d, a, b, c, x[10], S32); /* 38 */ 233 HH (c, d, a, b, x[ 6], S33); /* 39 */ 234 HH (b, c, d, a, x[14], S34); /* 40 */ 235 HH (a, b, c, d, x[ 1], S31); /* 41 */ 236 HH (d, a, b, c, x[ 9], S32); /* 42 */ 237 HH (c, d, a, b, x[ 5], S33); /* 43 */ 238 HH (b, c, d, a, x[13], S34); /* 44 */ 239 HH (a, b, c, d, x[ 3], S31); /* 45 */ 240 HH (d, a, b, c, x[11], S32); /* 46 */ 241 HH (c, d, a, b, x[ 7], S33); /* 47 */ 242 HH (b, c, d, a, x[15], S34); /* 48 */ 243 244 state[0] += a; 245 state[1] += b; 246 state[2] += c; 247 state[3] += d; 248 249 /* Zeroize sensitive information. 250 */ 251 bzero((POINTER)x, sizeof (x)); 252 } 253 254 /* Encodes input (UINT4) into output (unsigned char). Assumes len is 255 a multiple of 4. 256 */ 257 static void Encode (output, input, len) 258 unsigned char *output; 259 UINT4 *input; 260 unsigned int len; 261 { 262 unsigned int i, j; 263 264 for (i = 0, j = 0; j < len; i++, j += 4) { 265 output[j] = (unsigned char)(input[i] & 0xff); 266 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 267 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 268 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 269 } 270 } 271 272 /* Decodes input (unsigned char) into output (UINT4). Assumes len is 273 a multiple of 4. 274 */ 275 static void Decode (output, input, len) 276 277 UINT4 *output; 278 const unsigned char *input; 279 unsigned int len; 280 { 281 unsigned int i, j; 282 283 for (i = 0, j = 0; j < len; i++, j += 4) 284 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | 285 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); 286 } 287