| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * The MD4 message digest function |
| 4 | * |
| 5 | * (c) 1999 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 "md4.h" |
| 36 | |
| 37 | /*----- Main code ---------------------------------------------------------*/ |
| 38 | |
| 39 | /* --- @md4_compress@ --- * |
| 40 | * |
| 41 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
| 42 | * @const void *sbuf@ = pointer to buffer of appropriate size |
| 43 | * |
| 44 | * Returns: --- |
| 45 | * |
| 46 | * Use: RIPEMD-160 compression function. |
| 47 | */ |
| 48 | |
| 49 | void md4_compress(md4_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) & (y)) | ((x) & (z)) | ((y) & (z))) |
| 75 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
| 76 | |
| 77 | #define T(w, x, y, z, i, r, k, f) do { \ |
| 78 | uint32 _t = w + f(x, y, z) + buf[i] + k; \ |
| 79 | w = ROL32(_t, r); \ |
| 80 | } while (0) |
| 81 | |
| 82 | #define FF(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x00000000, F) |
| 83 | #define GG(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x5a827999, G) |
| 84 | #define HH(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x6ed9eba1, H) |
| 85 | |
| 86 | /* --- The main compression function --- */ |
| 87 | |
| 88 | FF(a, b, c, d, 0, 3); |
| 89 | FF(d, a, b, c, 1, 7); |
| 90 | FF(c, d, a, b, 2, 11); |
| 91 | FF(b, c, d, a, 3, 19); |
| 92 | FF(a, b, c, d, 4, 3); |
| 93 | FF(d, a, b, c, 5, 7); |
| 94 | FF(c, d, a, b, 6, 11); |
| 95 | FF(b, c, d, a, 7, 19); |
| 96 | FF(a, b, c, d, 8, 3); |
| 97 | FF(d, a, b, c, 9, 7); |
| 98 | FF(c, d, a, b, 10, 11); |
| 99 | FF(b, c, d, a, 11, 19); |
| 100 | FF(a, b, c, d, 12, 3); |
| 101 | FF(d, a, b, c, 13, 7); |
| 102 | FF(c, d, a, b, 14, 11); |
| 103 | FF(b, c, d, a, 15, 19); |
| 104 | |
| 105 | GG(a, b, c, d, 0, 3); |
| 106 | GG(d, a, b, c, 4, 5); |
| 107 | GG(c, d, a, b, 8, 9); |
| 108 | GG(b, c, d, a, 12, 13); |
| 109 | GG(a, b, c, d, 1, 3); |
| 110 | GG(d, a, b, c, 5, 5); |
| 111 | GG(c, d, a, b, 9, 9); |
| 112 | GG(b, c, d, a, 13, 13); |
| 113 | GG(a, b, c, d, 2, 3); |
| 114 | GG(d, a, b, c, 6, 5); |
| 115 | GG(c, d, a, b, 10, 9); |
| 116 | GG(b, c, d, a, 14, 13); |
| 117 | GG(a, b, c, d, 3, 3); |
| 118 | GG(d, a, b, c, 7, 5); |
| 119 | GG(c, d, a, b, 11, 9); |
| 120 | GG(b, c, d, a, 15, 13); |
| 121 | |
| 122 | HH(a, b, c, d, 0, 3); |
| 123 | HH(d, a, b, c, 8, 9); |
| 124 | HH(c, d, a, b, 4, 11); |
| 125 | HH(b, c, d, a, 12, 15); |
| 126 | HH(a, b, c, d, 2, 3); |
| 127 | HH(d, a, b, c, 10, 9); |
| 128 | HH(c, d, a, b, 6, 11); |
| 129 | HH(b, c, d, a, 14, 15); |
| 130 | HH(a, b, c, d, 1, 3); |
| 131 | HH(d, a, b, c, 9, 9); |
| 132 | HH(c, d, a, b, 5, 11); |
| 133 | HH(b, c, d, a, 13, 15); |
| 134 | HH(a, b, c, d, 3, 3); |
| 135 | HH(d, a, b, c, 11, 9); |
| 136 | HH(c, d, a, b, 7, 11); |
| 137 | HH(b, c, d, a, 15, 15); |
| 138 | |
| 139 | /* --- Update the chaining variables --- */ |
| 140 | |
| 141 | ctx->a += a; |
| 142 | ctx->b += b; |
| 143 | ctx->c += c; |
| 144 | ctx->d += d; |
| 145 | } |
| 146 | |
| 147 | /* --- @md4_init@ --- * |
| 148 | * |
| 149 | * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize |
| 150 | * |
| 151 | * Returns: --- |
| 152 | * |
| 153 | * Use: Initializes a context block ready for hashing. |
| 154 | */ |
| 155 | |
| 156 | void md4_init(md4_ctx *ctx) |
| 157 | { |
| 158 | ctx->a = 0x67452301; |
| 159 | ctx->b = 0xefcdab89; |
| 160 | ctx->c = 0x98badcfe; |
| 161 | ctx->d = 0x10325476; |
| 162 | ctx->off = 0; |
| 163 | ctx->nl = ctx->nh = 0; |
| 164 | } |
| 165 | |
| 166 | /* --- @md4_set@ --- * |
| 167 | * |
| 168 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
| 169 | * @const void *buf@ = pointer to state buffer |
| 170 | * @unsigned long count@ = current count of bytes processed |
| 171 | * |
| 172 | * Returns: --- |
| 173 | * |
| 174 | * Use: Initializes a context block from a given state. This is |
| 175 | * useful in cases where the initial hash state is meant to be |
| 176 | * secret, e.g., for NMAC and HMAC support. |
| 177 | */ |
| 178 | |
| 179 | void md4_set(md4_ctx *ctx, const void *buf, unsigned long count) |
| 180 | { |
| 181 | const octet *p = buf; |
| 182 | ctx->a = LOAD32_L(p + 0); |
| 183 | ctx->b = LOAD32_L(p + 4); |
| 184 | ctx->c = LOAD32_L(p + 8); |
| 185 | ctx->d = LOAD32_L(p + 12); |
| 186 | ctx->off = 0; |
| 187 | ctx->nl = U32(count); |
| 188 | ctx->nh = U32(((count & ~MASK32) >> 16) >> 16); |
| 189 | } |
| 190 | |
| 191 | /* --- @md4_hash@ --- * |
| 192 | * |
| 193 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
| 194 | * @const void *buf@ = buffer of data to hash |
| 195 | * @size_t sz@ = size of buffer to hash |
| 196 | * |
| 197 | * Returns: --- |
| 198 | * |
| 199 | * Use: Hashes a buffer of data. The buffer may be of any size and |
| 200 | * alignment. |
| 201 | */ |
| 202 | |
| 203 | void md4_hash(md4_ctx *ctx, const void *buf, size_t sz) |
| 204 | { |
| 205 | HASH_BUFFER(MD4, md4, ctx, buf, sz); |
| 206 | } |
| 207 | |
| 208 | /* --- @md4_done@ --- * |
| 209 | * |
| 210 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
| 211 | * @void *hash@ = pointer to output buffer |
| 212 | * |
| 213 | * Returns: --- |
| 214 | * |
| 215 | * Use: Returns the hash of the data read so far. |
| 216 | */ |
| 217 | |
| 218 | void md4_done(md4_ctx *ctx, void *hash) |
| 219 | { |
| 220 | octet *p = hash; |
| 221 | HASH_MD5STRENGTH(MD4, md4, ctx); |
| 222 | STORE32_L(p + 0, ctx->a); |
| 223 | STORE32_L(p + 4, ctx->b); |
| 224 | STORE32_L(p + 8, ctx->c); |
| 225 | STORE32_L(p + 12, ctx->d); |
| 226 | } |
| 227 | |
| 228 | /* --- @md4_state@ --- * |
| 229 | * |
| 230 | * Arguments: @md4_ctx *ctx@ = pointer to context |
| 231 | * @void *state@ = pointer to buffer for current state |
| 232 | * |
| 233 | * Returns: Number of bytes written to the hash function so far. |
| 234 | * |
| 235 | * Use: Returns the current state of the hash function such that |
| 236 | * it can be passed to @md4_set@. |
| 237 | */ |
| 238 | |
| 239 | unsigned long md4_state(md4_ctx *ctx, void *state) |
| 240 | { |
| 241 | octet *p = state; |
| 242 | STORE32_L(p + 0, ctx->a); |
| 243 | STORE32_L(p + 4, ctx->b); |
| 244 | STORE32_L(p + 8, ctx->c); |
| 245 | STORE32_L(p + 12, ctx->d); |
| 246 | return (ctx->nl | ((ctx->nh >> 16) >> 16)); |
| 247 | } |
| 248 | |
| 249 | /* --- Generic interface --- */ |
| 250 | |
| 251 | GHASH_DEF(MD4, md4) |
| 252 | |
| 253 | /* --- Test rig --- */ |
| 254 | |
| 255 | HASH_TEST(MD4, md4) |
| 256 | |
| 257 | /*----- That's all, folks -------------------------------------------------*/ |