1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm 2 */ 3 4 /*- 5 Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved. 6 7 License to copy and use this software is granted provided that it 8 is identified as the "RSA Data Security, Inc. MD4 Message-Digest 9 Algorithm" in all material mentioning or referencing this software 10 or this function. 11 12 License is also granted to make and use derivative works provided 13 that such works are identified as "derived from the RSA Data 14 Security, Inc. MD4 Message-Digest Algorithm" in all material 15 mentioning or referencing the derived work. 16 17 RSA Data Security, Inc. makes no representations concerning either 18 the merchantability of this software or the suitability of this 19 software for any particular purpose. It is provided "as is" 20 without express or implied warranty of any kind. 21 22 These notices must be retained in any copies of any part of this 23 documentation and/or software. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/md4.h> 32 33 typedef unsigned char *POINTER; 34 typedef u_int16_t UINT2; 35 typedef u_int32_t UINT4; 36 37 #define PROTO_LIST(list) list 38 39 /* Constants for MD4Transform routine. 40 */ 41 #define S11 3 42 #define S12 7 43 #define S13 11 44 #define S14 19 45 #define S21 3 46 #define S22 5 47 #define S23 9 48 #define S24 13 49 #define S31 3 50 #define S32 9 51 #define S33 11 52 #define S34 15 53 54 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64])); 55 static void Encode PROTO_LIST 56 ((unsigned char *, UINT4 *, unsigned int)); 57 static void Decode PROTO_LIST 58 ((UINT4 *, const unsigned char *, unsigned int)); 59 60 static unsigned char PADDING[64] = { 61 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 63 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 64 }; 65 66 /* F, G and H are basic MD4 functions. 67 */ 68 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 69 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) 70 #define H(x, y, z) ((x) ^ (y) ^ (z)) 71 72 /* ROTATE_LEFT rotates x left n bits. 73 */ 74 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 75 76 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */ 77 /* Rotation is separate from addition to prevent recomputation */ 78 #define FF(a, b, c, d, x, s) { \ 79 (a) += F ((b), (c), (d)) + (x); \ 80 (a) = ROTATE_LEFT ((a), (s)); \ 81 } 82 #define GG(a, b, c, d, x, s) { \ 83 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \ 84 (a) = ROTATE_LEFT ((a), (s)); \ 85 } 86 #define HH(a, b, c, d, x, s) { \ 87 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \ 88 (a) = ROTATE_LEFT ((a), (s)); \ 89 } 90 91 /* MD4 initialization. Begins an MD4 operation, writing a new context. 92 */ 93 void MD4Init (context) 94 MD4_CTX *context; /* context */ 95 { 96 context->count[0] = context->count[1] = 0; 97 98 /* Load magic initialization constants. 99 */ 100 context->state[0] = 0x67452301; 101 context->state[1] = 0xefcdab89; 102 context->state[2] = 0x98badcfe; 103 context->state[3] = 0x10325476; 104 } 105 106 /* MD4 block update operation. Continues an MD4 message-digest 107 operation, processing another message block, and updating the 108 context. 109 */ 110 void MD4Update (context, input, inputLen) 111 MD4_CTX *context; /* context */ 112 const unsigned char *input; /* input block */ 113 unsigned int inputLen; /* length of input block */ 114 { 115 unsigned int i, index, partLen; 116 117 /* Compute number of bytes mod 64 */ 118 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 119 /* Update number of bits */ 120 if ((context->count[0] += ((UINT4)inputLen << 3)) 121 < ((UINT4)inputLen << 3)) 122 context->count[1]++; 123 context->count[1] += ((UINT4)inputLen >> 29); 124 125 partLen = 64 - index; 126 /* Transform as many times as possible. 127 */ 128 if (inputLen >= partLen) { 129 bcopy(input, &context->buffer[index], partLen); 130 MD4Transform (context->state, context->buffer); 131 132 for (i = partLen; i + 63 < inputLen; i += 64) 133 MD4Transform (context->state, &input[i]); 134 135 index = 0; 136 } 137 else 138 i = 0; 139 140 /* Buffer remaining input */ 141 bcopy(&input[i], &context->buffer[index], inputLen-i); 142 } 143 144 /* MD4 padding. */ 145 void MD4Pad (context) 146 MD4_CTX *context; /* context */ 147 { 148 unsigned char bits[8]; 149 unsigned int index, padLen; 150 151 /* Save number of bits */ 152 Encode (bits, context->count, 8); 153 154 /* Pad out to 56 mod 64. 155 */ 156 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 157 padLen = (index < 56) ? (56 - index) : (120 - index); 158 MD4Update (context, PADDING, padLen); 159 160 /* Append length (before padding) */ 161 MD4Update (context, bits, 8); 162 } 163 164 /* MD4 finalization. Ends an MD4 message-digest operation, writing the 165 the message digest and zeroizing the context. 166 */ 167 void MD4Final (unsigned char digest[static 16], MD4_CTX *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(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