| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * The MD5 message digest function |
| 4 | * |
| 5 | * (c) 1998 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Catacomb. |
| 11 | * |
| 12 | * Catacomb is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU Library General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | * Catacomb is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU Library General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with Catacomb; if not, write to the Free |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 25 | * MA 02111-1307, USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #include <mLib/bits.h> |
| 31 | |
| 32 | #include "ghash.h" |
| 33 | #include "ghash-def.h" |
| 34 | #include "hash.h" |
| 35 | #include "md5.h" |
| 36 | |
| 37 | /*----- Main code ---------------------------------------------------------*/ |
| 38 | |
| 39 | /* --- @md5_compress@ --- * |
| 40 | * |
| 41 | * Arguments: @md5_ctx *ctx@ = pointer to context block |
| 42 | * @const void *sbuf@ = pointer to buffer of appropriate size |
| 43 | * |
| 44 | * Returns: --- |
| 45 | * |
| 46 | * Use: MD5 compression function. |
| 47 | */ |
| 48 | |
| 49 | void md5_compress(md5_ctx *ctx, const void *sbuf) |
| 50 | { |
| 51 | uint32 a, b, c, d; |
| 52 | uint32 buf[16]; |
| 53 | |
| 54 | /* --- Fetch the chaining variables --- */ |
| 55 | |
| 56 | a = ctx->a; |
| 57 | b = ctx->b; |
| 58 | c = ctx->c; |
| 59 | d = ctx->d; |
| 60 | |
| 61 | /* --- Fetch the buffer contents --- */ |
| 62 | |
| 63 | { |
| 64 | int i; |
| 65 | const octet *p; |
| 66 | |
| 67 | for (i = 0, p = sbuf; i < 16; i++, p += 4) |
| 68 | buf[i] = LOAD32_L(p); |
| 69 | } |
| 70 | |
| 71 | /* --- Definitions for round functions --- */ |
| 72 | |
| 73 | #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) |
| 74 | #define G(x, y, z) (((x) & (z)) | ((y) & ~(z))) |
| 75 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
| 76 | #define I(x, y, z) ((y) ^ ((x) | ~(z))) |
| 77 | |
| 78 | #define T(w, x, y, z, i, r, k, f) do { \ |
| 79 | uint32 _t = w + f(x, y, z) + buf[i] + k; \ |
| 80 | w = ROL32(_t, r) + x; \ |
| 81 | } while (0) |
| 82 | |
| 83 | #define FF(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, F) |
| 84 | #define GG(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, G) |
| 85 | #define HH(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, H) |
| 86 | #define II(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, I) |
| 87 | |
| 88 | /* --- The main compression function --- */ |
| 89 | |
| 90 | FF(a, b, c, d, 0, 7, 0xd76aa478); |
| 91 | FF(d, a, b, c, 1, 12, 0xe8c7b756); |
| 92 | FF(c, d, a, b, 2, 17, 0x242070db); |
| 93 | FF(b, c, d, a, 3, 22, 0xc1bdceee); |
| 94 | FF(a, b, c, d, 4, 7, 0xf57c0faf); |
| 95 | FF(d, a, b, c, 5, 12, 0x4787c62a); |
| 96 | FF(c, d, a, b, 6, 17, 0xa8304613); |
| 97 | FF(b, c, d, a, 7, 22, 0xfd469501); |
| 98 | FF(a, b, c, d, 8, 7, 0x698098d8); |
| 99 | FF(d, a, b, c, 9, 12, 0x8b44f7af); |
| 100 | FF(c, d, a, b, 10, 17, 0xffff5bb1); |
| 101 | FF(b, c, d, a, 11, 22, 0x895cd7be); |
| 102 | FF(a, b, c, d, 12, 7, 0x6b901122); |
| 103 | FF(d, a, b, c, 13, 12, 0xfd987193); |
| 104 | FF(c, d, a, b, 14, 17, 0xa679438e); |
| 105 | FF(b, c, d, a, 15, 22, 0x49b40821); |
| 106 | |
| 107 | GG(a, b, c, d, 1, 5, 0xf61e2562); |
| 108 | GG(d, a, b, c, 6, 9, 0xc040b340); |
| 109 | GG(c, d, a, b, 11, 14, 0x265e5a51); |
| 110 | GG(b, c, d, a, 0, 20, 0xe9b6c7aa); |
| 111 | GG(a, b, c, d, 5, 5, 0xd62f105d); |
| 112 | GG(d, a, b, c, 10, 9, 0x02441453); |
| 113 | GG(c, d, a, b, 15, 14, 0xd8a1e681); |
| 114 | GG(b, c, d, a, 4, 20, 0xe7d3fbc8); |
| 115 | GG(a, b, c, d, 9, 5, 0x21e1cde6); |
| 116 | GG(d, a, b, c, 14, 9, 0xc33707d6); |
| 117 | GG(c, d, a, b, 3, 14, 0xf4d50d87); |
| 118 | GG(b, c, d, a, 8, 20, 0x455a14ed); |
| 119 | GG(a, b, c, d, 13, 5, 0xa9e3e905); |
| 120 | GG(d, a, b, c, 2, 9, 0xfcefa3f8); |
| 121 | GG(c, d, a, b, 7, 14, 0x676f02d9); |
| 122 | GG(b, c, d, a, 12, 20, 0x8d2a4c8a); |
| 123 | |
| 124 | HH(a, b, c, d, 5, 4, 0xfffa3942); |
| 125 | HH(d, a, b, c, 8, 11, 0x8771f681); |
| 126 | HH(c, d, a, b, 11, 16, 0x6d9d6122); |
| 127 | HH(b, c, d, a, 14, 23, 0xfde5380c); |
| 128 | HH(a, b, c, d, 1, 4, 0xa4beea44); |
| 129 | HH(d, a, b, c, 4, 11, 0x4bdecfa9); |
| 130 | HH(c, d, a, b, 7, 16, 0xf6bb4b60); |
| 131 | HH(b, c, d, a, 10, 23, 0xbebfbc70); |
| 132 | HH(a, b, c, d, 13, 4, 0x289b7ec6); |
| 133 | HH(d, a, b, c, 0, 11, 0xeaa127fa); |
| 134 | HH(c, d, a, b, 3, 16, 0xd4ef3085); |
| 135 | HH(b, c, d, a, 6, 23, 0x04881d05); |
| 136 | HH(a, b, c, d, 9, 4, 0xd9d4d039); |
| 137 | HH(d, a, b, c, 12, 11, 0xe6db99e5); |
| 138 | HH(c, d, a, b, 15, 16, 0x1fa27cf8); |
| 139 | HH(b, c, d, a, 2, 23, 0xc4ac5665); |
| 140 | |
| 141 | II(a, b, c, d, 0, 6, 0xf4292244); |
| 142 | II(d, a, b, c, 7, 10, 0x432aff97); |
| 143 | II(c, d, a, b, 14, 15, 0xab9423a7); |
| 144 | II(b, c, d, a, 5, 21, 0xfc93a039); |
| 145 | II(a, b, c, d, 12, 6, 0x655b59c3); |
| 146 | II(d, a, b, c, 3, 10, 0x8f0ccc92); |
| 147 | II(c, d, a, b, 10, 15, 0xffeff47d); |
| 148 | II(b, c, d, a, 1, 21, 0x85845dd1); |
| 149 | II(a, b, c, d, 8, 6, 0x6fa87e4f); |
| 150 | II(d, a, b, c, 15, 10, 0xfe2ce6e0); |
| 151 | II(c, d, a, b, 6, 15, 0xa3014314); |
| 152 | II(b, c, d, a, 13, 21, 0x4e0811a1); |
| 153 | II(a, b, c, d, 4, 6, 0xf7537e82); |
| 154 | II(d, a, b, c, 11, 10, 0xbd3af235); |
| 155 | II(c, d, a, b, 2, 15, 0x2ad7d2bb); |
| 156 | II(b, c, d, a, 9, 21, 0xeb86d391); |
| 157 | |
| 158 | /* --- Update the chaining variables --- */ |
| 159 | |
| 160 | ctx->a += a; |
| 161 | ctx->b += b; |
| 162 | ctx->c += c; |
| 163 | ctx->d += d; |
| 164 | } |
| 165 | |
| 166 | /* --- @md5_init@ --- * |
| 167 | * |
| 168 | * Arguments: @md5_ctx *ctx@ = pointer to context block to initialize |
| 169 | * |
| 170 | * Returns: --- |
| 171 | * |
| 172 | * Use: Initializes a context block ready for hashing. |
| 173 | */ |
| 174 | |
| 175 | void md5_init(md5_ctx *ctx) |
| 176 | { |
| 177 | ctx->a = 0x67452301; |
| 178 | ctx->b = 0xefcdab89; |
| 179 | ctx->c = 0x98badcfe; |
| 180 | ctx->d = 0x10325476; |
| 181 | ctx->off = 0; |
| 182 | ctx->nl = ctx->nh = 0; |
| 183 | } |
| 184 | |
| 185 | /* --- @md5_set@ --- * |
| 186 | * |
| 187 | * Arguments: @md5_ctx *ctx@ = pointer to context block |
| 188 | * @const void *buf@ = pointer to state buffer |
| 189 | * @unsigned long count@ = current count of bytes processed |
| 190 | * |
| 191 | * Returns: --- |
| 192 | * |
| 193 | * Use: Initializes a context block from a given state. This is |
| 194 | * useful in cases where the initial hash state is meant to be |
| 195 | * secret, e.g., for NMAC and HMAC support. |
| 196 | */ |
| 197 | |
| 198 | void md5_set(md5_ctx *ctx, const void *buf, unsigned long count) |
| 199 | { |
| 200 | const octet *p = buf; |
| 201 | ctx->a = LOAD32_L(p + 0); |
| 202 | ctx->b = LOAD32_L(p + 4); |
| 203 | ctx->c = LOAD32_L(p + 8); |
| 204 | ctx->d = LOAD32_L(p + 12); |
| 205 | ctx->off = 0; |
| 206 | ctx->nl = U32(count); |
| 207 | ctx->nh = U32(((count & ~MASK32) >> 16) >> 16); |
| 208 | } |
| 209 | |
| 210 | /* --- @md5_hash@ --- * |
| 211 | * |
| 212 | * Arguments: @md5_ctx *ctx@ = pointer to context block |
| 213 | * @const void *buf@ = buffer of data to hash |
| 214 | * @size_t sz@ = size of buffer to hash |
| 215 | * |
| 216 | * Returns: --- |
| 217 | * |
| 218 | * Use: Hashes a buffer of data. The buffer may be of any size and |
| 219 | * alignment. |
| 220 | */ |
| 221 | |
| 222 | void md5_hash(md5_ctx *ctx, const void *buf, size_t sz) |
| 223 | { |
| 224 | HASH_BUFFER(MD5, md5, ctx, buf, sz); |
| 225 | } |
| 226 | |
| 227 | /* --- @md5_done@ --- * |
| 228 | * |
| 229 | * Arguments: @md5_ctx *ctx@ = pointer to context block |
| 230 | * @void *hash@ = pointer to output buffer |
| 231 | * |
| 232 | * Returns: --- |
| 233 | * |
| 234 | * Use: Returns the hash of the data read so far. |
| 235 | */ |
| 236 | |
| 237 | void md5_done(md5_ctx *ctx, void *hash) |
| 238 | { |
| 239 | octet *p = hash; |
| 240 | HASH_MD5STRENGTH(MD5, md5, ctx); |
| 241 | STORE32_L(p + 0, ctx->a); |
| 242 | STORE32_L(p + 4, ctx->b); |
| 243 | STORE32_L(p + 8, ctx->c); |
| 244 | STORE32_L(p + 12, ctx->d); |
| 245 | } |
| 246 | |
| 247 | /* --- @md5_state@ --- * |
| 248 | * |
| 249 | * Arguments: @md5_ctx *ctx@ = pointer to context |
| 250 | * @void *state@ = pointer to buffer for current state |
| 251 | * |
| 252 | * Returns: Number of bytes written to the hash function so far. |
| 253 | * |
| 254 | * Use: Returns the current state of the hash function such that |
| 255 | * it can be passed to @md5_set@. |
| 256 | */ |
| 257 | |
| 258 | unsigned long md5_state(md5_ctx *ctx, void *state) |
| 259 | { |
| 260 | octet *p = state; |
| 261 | STORE32_L(p + 0, ctx->a); |
| 262 | STORE32_L(p + 4, ctx->b); |
| 263 | STORE32_L(p + 8, ctx->c); |
| 264 | STORE32_L(p + 12, ctx->d); |
| 265 | return (ctx->nl | ((ctx->nh << 16) << 16)); |
| 266 | } |
| 267 | |
| 268 | /* --- Generic interface --- */ |
| 269 | |
| 270 | GHASH_DEF(MD5, md5) |
| 271 | |
| 272 | /* --- Test code --- */ |
| 273 | |
| 274 | HASH_TEST(MD5, md5) |
| 275 | |
| 276 | /*----- That's all, folks -------------------------------------------------*/ |