| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: md4.c,v 1.3 2000/06/17 11:31:43 mdw Exp $ |
| 4 | * |
| 5 | * The MD4 message digest function |
| 6 | * |
| 7 | * (c) 1999 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: md4.c,v $ |
| 33 | * Revision 1.3 2000/06/17 11:31:43 mdw |
| 34 | * Portability fix for broken compilers. |
| 35 | * |
| 36 | * Revision 1.2 1999/12/10 23:20:03 mdw |
| 37 | * New hash interface requirements. |
| 38 | * |
| 39 | * Revision 1.1 1999/09/03 08:41:12 mdw |
| 40 | * Initial import. |
| 41 | * |
| 42 | */ |
| 43 | |
| 44 | /*----- Header files ------------------------------------------------------*/ |
| 45 | |
| 46 | #include <mLib/bits.h> |
| 47 | |
| 48 | #include "ghash.h" |
| 49 | #include "ghash-def.h" |
| 50 | #include "hash.h" |
| 51 | #include "md4.h" |
| 52 | |
| 53 | /*----- Main code ---------------------------------------------------------*/ |
| 54 | |
| 55 | /* --- @md4_compress@ --- * |
| 56 | * |
| 57 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
| 58 | * @const void *sbuf@ = pointer to buffer of appropriate size |
| 59 | * |
| 60 | * Returns: --- |
| 61 | * |
| 62 | * Use: RIPEMD-160 compression function. |
| 63 | */ |
| 64 | |
| 65 | void md4_compress(md4_ctx *ctx, const void *sbuf) |
| 66 | { |
| 67 | uint32 a, b, c, d; |
| 68 | uint32 buf[16]; |
| 69 | |
| 70 | /* --- Fetch the chaining variables --- */ |
| 71 | |
| 72 | a = ctx->a; |
| 73 | b = ctx->b; |
| 74 | c = ctx->c; |
| 75 | d = ctx->d; |
| 76 | |
| 77 | /* --- Fetch the buffer contents --- */ |
| 78 | |
| 79 | { |
| 80 | int i; |
| 81 | const octet *p; |
| 82 | |
| 83 | for (i = 0, p = sbuf; i < 16; i++, p += 4) |
| 84 | buf[i] = LOAD32_L(p); |
| 85 | } |
| 86 | |
| 87 | /* --- Definitions for round functions --- */ |
| 88 | |
| 89 | #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) |
| 90 | #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) |
| 91 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
| 92 | |
| 93 | #define T(w, x, y, z, i, r, k, f) do { \ |
| 94 | uint32 _t = w + f(x, y, z) + buf[i] + k; \ |
| 95 | w = ROL32(_t, r); \ |
| 96 | } while (0) |
| 97 | |
| 98 | #define FF(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x00000000, F) |
| 99 | #define GG(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x5a827999, G) |
| 100 | #define HH(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x6ed9eba1, H) |
| 101 | |
| 102 | /* --- The main compression function --- */ |
| 103 | |
| 104 | FF(a, b, c, d, 0, 3); |
| 105 | FF(d, a, b, c, 1, 7); |
| 106 | FF(c, d, a, b, 2, 11); |
| 107 | FF(b, c, d, a, 3, 19); |
| 108 | FF(a, b, c, d, 4, 3); |
| 109 | FF(d, a, b, c, 5, 7); |
| 110 | FF(c, d, a, b, 6, 11); |
| 111 | FF(b, c, d, a, 7, 19); |
| 112 | FF(a, b, c, d, 8, 3); |
| 113 | FF(d, a, b, c, 9, 7); |
| 114 | FF(c, d, a, b, 10, 11); |
| 115 | FF(b, c, d, a, 11, 19); |
| 116 | FF(a, b, c, d, 12, 3); |
| 117 | FF(d, a, b, c, 13, 7); |
| 118 | FF(c, d, a, b, 14, 11); |
| 119 | FF(b, c, d, a, 15, 19); |
| 120 | |
| 121 | GG(a, b, c, d, 0, 3); |
| 122 | GG(d, a, b, c, 4, 5); |
| 123 | GG(c, d, a, b, 8, 9); |
| 124 | GG(b, c, d, a, 12, 13); |
| 125 | GG(a, b, c, d, 1, 3); |
| 126 | GG(d, a, b, c, 5, 5); |
| 127 | GG(c, d, a, b, 9, 9); |
| 128 | GG(b, c, d, a, 13, 13); |
| 129 | GG(a, b, c, d, 2, 3); |
| 130 | GG(d, a, b, c, 6, 5); |
| 131 | GG(c, d, a, b, 10, 9); |
| 132 | GG(b, c, d, a, 14, 13); |
| 133 | GG(a, b, c, d, 3, 3); |
| 134 | GG(d, a, b, c, 7, 5); |
| 135 | GG(c, d, a, b, 11, 9); |
| 136 | GG(b, c, d, a, 15, 13); |
| 137 | |
| 138 | HH(a, b, c, d, 0, 3); |
| 139 | HH(d, a, b, c, 8, 9); |
| 140 | HH(c, d, a, b, 4, 11); |
| 141 | HH(b, c, d, a, 12, 15); |
| 142 | HH(a, b, c, d, 2, 3); |
| 143 | HH(d, a, b, c, 10, 9); |
| 144 | HH(c, d, a, b, 6, 11); |
| 145 | HH(b, c, d, a, 14, 15); |
| 146 | HH(a, b, c, d, 1, 3); |
| 147 | HH(d, a, b, c, 9, 9); |
| 148 | HH(c, d, a, b, 5, 11); |
| 149 | HH(b, c, d, a, 13, 15); |
| 150 | HH(a, b, c, d, 3, 3); |
| 151 | HH(d, a, b, c, 11, 9); |
| 152 | HH(c, d, a, b, 7, 11); |
| 153 | HH(b, c, d, a, 15, 15); |
| 154 | |
| 155 | /* --- Update the chaining variables --- */ |
| 156 | |
| 157 | ctx->a += a; |
| 158 | ctx->b += b; |
| 159 | ctx->c += c; |
| 160 | ctx->d += d; |
| 161 | } |
| 162 | |
| 163 | /* --- @md4_init@ --- * |
| 164 | * |
| 165 | * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize |
| 166 | * |
| 167 | * Returns: --- |
| 168 | * |
| 169 | * Use: Initializes a context block ready for hashing. |
| 170 | */ |
| 171 | |
| 172 | void md4_init(md4_ctx *ctx) |
| 173 | { |
| 174 | ctx->a = 0x67452301; |
| 175 | ctx->b = 0xefcdab89; |
| 176 | ctx->c = 0x98badcfe; |
| 177 | ctx->d = 0x10325476; |
| 178 | ctx->off = 0; |
| 179 | ctx->nl = ctx->nh = 0; |
| 180 | } |
| 181 | |
| 182 | /* --- @md4_set@ --- * |
| 183 | * |
| 184 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
| 185 | * @const void *buf@ = pointer to state buffer |
| 186 | * @unsigned long count@ = current count of bytes processed |
| 187 | * |
| 188 | * Returns: --- |
| 189 | * |
| 190 | * Use: Initializes a context block from a given state. This is |
| 191 | * useful in cases where the initial hash state is meant to be |
| 192 | * secret, e.g., for NMAC and HMAC support. |
| 193 | */ |
| 194 | |
| 195 | void md4_set(md4_ctx *ctx, const void *buf, unsigned long count) |
| 196 | { |
| 197 | const octet *p = buf; |
| 198 | ctx->a = LOAD32_L(p + 0); |
| 199 | ctx->b = LOAD32_L(p + 4); |
| 200 | ctx->c = LOAD32_L(p + 8); |
| 201 | ctx->d = LOAD32_L(p + 12); |
| 202 | ctx->off = 0; |
| 203 | ctx->nl = U32(count); |
| 204 | ctx->nh = U32(((count & ~MASK32) >> 16) >> 16); |
| 205 | } |
| 206 | |
| 207 | /* --- @md4_hash@ --- * |
| 208 | * |
| 209 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
| 210 | * @const void *buf@ = buffer of data to hash |
| 211 | * @size_t sz@ = size of buffer to hash |
| 212 | * |
| 213 | * Returns: --- |
| 214 | * |
| 215 | * Use: Hashes a buffer of data. The buffer may be of any size and |
| 216 | * alignment. |
| 217 | */ |
| 218 | |
| 219 | void md4_hash(md4_ctx *ctx, const void *buf, size_t sz) |
| 220 | { |
| 221 | HASH_BUFFER(MD4, md4, ctx, buf, sz); |
| 222 | } |
| 223 | |
| 224 | /* --- @md4_done@ --- * |
| 225 | * |
| 226 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
| 227 | * @void *hash@ = pointer to output buffer |
| 228 | * |
| 229 | * Returns: --- |
| 230 | * |
| 231 | * Use: Returns the hash of the data read so far. |
| 232 | */ |
| 233 | |
| 234 | void md4_done(md4_ctx *ctx, void *hash) |
| 235 | { |
| 236 | octet *p = hash; |
| 237 | HASH_MD5STRENGTH(MD4, md4, ctx); |
| 238 | STORE32_L(p + 0, ctx->a); |
| 239 | STORE32_L(p + 4, ctx->b); |
| 240 | STORE32_L(p + 8, ctx->c); |
| 241 | STORE32_L(p + 12, ctx->d); |
| 242 | } |
| 243 | |
| 244 | /* --- @md4_state@ --- * |
| 245 | * |
| 246 | * Arguments: @md4_ctx *ctx@ = pointer to context |
| 247 | * @void *state@ = pointer to buffer for current state |
| 248 | * |
| 249 | * Returns: Number of bytes written to the hash function so far. |
| 250 | * |
| 251 | * Use: Returns the current state of the hash function such that |
| 252 | * it can be passed to @md4_set@. |
| 253 | */ |
| 254 | |
| 255 | unsigned long md4_state(md4_ctx *ctx, void *state) |
| 256 | { |
| 257 | octet *p = state; |
| 258 | STORE32_L(p + 0, ctx->a); |
| 259 | STORE32_L(p + 4, ctx->b); |
| 260 | STORE32_L(p + 8, ctx->c); |
| 261 | STORE32_L(p + 12, ctx->d); |
| 262 | return (ctx->nl | ((ctx->nh >> 16) >> 16)); |
| 263 | } |
| 264 | |
| 265 | /* --- Generic interface --- */ |
| 266 | |
| 267 | GHASH_DEF(MD4, md4) |
| 268 | |
| 269 | /* --- Test rig --- */ |
| 270 | |
| 271 | HASH_TEST(MD4, md4) |
| 272 | |
| 273 | /*----- That's all, folks -------------------------------------------------*/ |