| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Generate the MARS S-box table |
| 4 | * |
| 5 | * (c) 2001 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 <assert.h> |
| 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include <mLib/bits.h> |
| 36 | |
| 37 | #include "sha.h" |
| 38 | |
| 39 | /*----- SHA-1 (quick version) ---------------------------------------------*/ |
| 40 | |
| 41 | /* --- @sha_compress@ --- * |
| 42 | * |
| 43 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
| 44 | * @const void *sbuf@ = pointer to buffer of appropriate size |
| 45 | * |
| 46 | * Returns: --- |
| 47 | * |
| 48 | * Use: SHA-1 compression function. |
| 49 | */ |
| 50 | |
| 51 | void sha_compress(sha_ctx *ctx, const void *sbuf) |
| 52 | { |
| 53 | uint32 a, b, c, d, e; |
| 54 | uint32 buf[80]; |
| 55 | |
| 56 | /* --- Fetch the chaining variables --- */ |
| 57 | |
| 58 | a = ctx->a; |
| 59 | b = ctx->b; |
| 60 | c = ctx->c; |
| 61 | d = ctx->d; |
| 62 | e = ctx->e; |
| 63 | |
| 64 | /* --- Fetch and expand the buffer contents --- */ |
| 65 | |
| 66 | { |
| 67 | int i; |
| 68 | const octet *p; |
| 69 | |
| 70 | for (i = 0, p = sbuf; i < 16; i++, p += 4) |
| 71 | buf[i] = LOAD32(p); |
| 72 | for (i = 16; i < 80; i++) { |
| 73 | uint32 x = buf[i - 3] ^ buf[i - 8] ^ buf[i - 14] ^ buf[i - 16]; |
| 74 | buf[i] = ROL32(x, 1); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /* --- Definitions for round functions --- */ |
| 79 | |
| 80 | #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) |
| 81 | #define G(x, y, z) ((x) ^ (y) ^ (z)) |
| 82 | #define H(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) |
| 83 | |
| 84 | #define T(v, w, x, y, z, i, f, k) do { \ |
| 85 | uint32 _x; \ |
| 86 | z = ROL32(v, 5) + f(w, x, y) + z + buf[i] + k; \ |
| 87 | w = ROR32(w, 2); \ |
| 88 | _x = v; v = z; z = y; y = x; x = w; w = _x; \ |
| 89 | } while (0) |
| 90 | |
| 91 | #define FF(v, w, x, y, z, i) T(v, w, x, y, z, i, F, 0x5a827999) |
| 92 | #define GG(v, w, x, y, z, i) T(v, w, x, y, z, i, G, 0x6ed9eba1) |
| 93 | #define HH(v, w, x, y, z, i) T(v, w, x, y, z, i, H, 0x8f1bbcdc) |
| 94 | #define II(v, w, x, y, z, i) T(v, w, x, y, z, i, G, 0xca62c1d6) |
| 95 | |
| 96 | /* --- The main compression function --- */ |
| 97 | |
| 98 | { |
| 99 | unsigned i; |
| 100 | for (i = 0; i < 20; i++) |
| 101 | FF(a, b, c, d, e, i); |
| 102 | for (i = 20; i < 40; i++) |
| 103 | GG(a, b, c, d, e, i); |
| 104 | for (i = 40; i < 60; i++) |
| 105 | HH(a, b, c, d, e, i); |
| 106 | for (i = 60; i < 80; i++) |
| 107 | II(a, b, c, d, e, i); |
| 108 | } |
| 109 | |
| 110 | ctx->a += a; |
| 111 | ctx->b += b; |
| 112 | ctx->c += c; |
| 113 | ctx->d += d; |
| 114 | ctx->e += e; |
| 115 | } |
| 116 | |
| 117 | /* --- @sha_init@ --- * |
| 118 | * |
| 119 | * Arguments: @sha_ctx *ctx@ = pointer to context block to initialize |
| 120 | * |
| 121 | * Returns: --- |
| 122 | * |
| 123 | * Use: Initializes a context block ready for hashing. |
| 124 | */ |
| 125 | |
| 126 | void sha_init(sha_ctx *ctx) |
| 127 | { |
| 128 | ctx->a = 0x67452301; |
| 129 | ctx->b = 0xefcdab89; |
| 130 | ctx->c = 0x98badcfe; |
| 131 | ctx->d = 0x10325476; |
| 132 | ctx->e = 0xc3d2e1f0; |
| 133 | ctx->off = 0; |
| 134 | ctx->nl = ctx->nh = 0; |
| 135 | } |
| 136 | |
| 137 | /* --- @sha_hash@ --- * |
| 138 | * |
| 139 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
| 140 | * @const void *buf@ = buffer of data to hash |
| 141 | * @size_t sz@ = size of buffer to hash |
| 142 | * |
| 143 | * Returns: --- |
| 144 | * |
| 145 | * Use: Hashes a buffer of data. The buffer may be of any size and |
| 146 | * alignment. |
| 147 | */ |
| 148 | |
| 149 | void sha_hash(sha_ctx *ctx, const void *buf, size_t sz) |
| 150 | { |
| 151 | sha_ctx *_bctx = (ctx); |
| 152 | size_t _bsz = (sz); |
| 153 | const octet *_bbuf = (octet *) (buf); |
| 154 | |
| 155 | { |
| 156 | uint32 _l = ((uint32) ((_bsz) & MASK32)); |
| 157 | uint32 _h = ((_bsz & ~MASK32) >> 16) >> 16; |
| 158 | _bctx->nh += _h; |
| 159 | _bctx->nl += _l; |
| 160 | if (_bctx->nl < _l || _bctx->nl & ~MASK32) |
| 161 | _bctx->nh++; |
| 162 | } |
| 163 | if (_bctx->off + _bsz < SHA_BUFSZ) { |
| 164 | memcpy(_bctx->buf + _bctx->off, _bbuf, _bsz); |
| 165 | _bctx->off += _bsz; |
| 166 | } else { |
| 167 | if (_bctx->off) { |
| 168 | size_t s = SHA_BUFSZ - _bctx->off; |
| 169 | memcpy(_bctx->buf + _bctx->off, _bbuf, s); |
| 170 | sha_compress(_bctx, _bctx->buf); |
| 171 | _bsz -= s; |
| 172 | _bbuf += s; |
| 173 | } |
| 174 | while (_bsz >= SHA_BUFSZ) { |
| 175 | sha_compress(_bctx, _bbuf); |
| 176 | _bsz -= SHA_BUFSZ; |
| 177 | _bbuf += SHA_BUFSZ; |
| 178 | } |
| 179 | if (_bsz) |
| 180 | memcpy(_bctx->buf, _bbuf, _bsz); |
| 181 | _bctx->off = _bsz; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /* --- @sha_done@ --- * |
| 186 | * |
| 187 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
| 188 | * @void *hash@ = pointer to output buffer |
| 189 | * |
| 190 | * Returns: --- |
| 191 | * |
| 192 | * Use: Returns the hash of the data read so far. |
| 193 | */ |
| 194 | |
| 195 | void sha_done(sha_ctx *ctx, void *hash) |
| 196 | { |
| 197 | octet *p = hash; |
| 198 | { |
| 199 | sha_ctx *_pctx = (ctx); |
| 200 | _pctx->buf[_pctx->off] = 0x80; |
| 201 | _pctx->off++; |
| 202 | if (_pctx->off > SHA_BUFSZ - 8) { |
| 203 | if (_pctx->off < SHA_BUFSZ) |
| 204 | memset(_pctx->buf + _pctx->off, 0, SHA_BUFSZ - _pctx->off); |
| 205 | sha_compress(_pctx, _pctx->buf); |
| 206 | memset(_pctx->buf, 0, SHA_BUFSZ - 8); |
| 207 | } else |
| 208 | memset(_pctx->buf + _pctx->off, 0, SHA_BUFSZ - _pctx->off - 8); |
| 209 | } |
| 210 | STORE32(ctx->buf + SHA_BUFSZ - 8, (ctx->nl >> 29) | (ctx->nh << 3)); |
| 211 | STORE32(ctx->buf + SHA_BUFSZ - 4, ctx->nl << 3); |
| 212 | sha_compress(ctx, ctx->buf); |
| 213 | STORE32(p + 0, ctx->a); |
| 214 | STORE32(p + 4, ctx->b); |
| 215 | STORE32(p + 8, ctx->c); |
| 216 | STORE32(p + 12, ctx->d); |
| 217 | STORE32(p + 16, ctx->e); |
| 218 | } |
| 219 | |
| 220 | /*----- Main code ---------------------------------------------------------*/ |
| 221 | |
| 222 | static void mks(uint32 c3, uint32 *s) |
| 223 | { |
| 224 | octet ibuf[16], obuf[20]; |
| 225 | sha_ctx h; |
| 226 | unsigned i, j; |
| 227 | |
| 228 | STORE32_L(ibuf + 4, 0xb7e15162); |
| 229 | STORE32_L(ibuf + 8, 0x243f6a88); |
| 230 | STORE32_L(ibuf + 12, c3); |
| 231 | |
| 232 | for (i = 0; i < 510; i += 5) { |
| 233 | STORE32_L(ibuf, i); |
| 234 | sha_init(&h); |
| 235 | sha_hash(&h, ibuf, sizeof(ibuf)); |
| 236 | sha_done(&h, obuf); |
| 237 | for (j = 0; j < 5; j++) |
| 238 | *s++ = LOAD32_L(obuf + (4 * j)); |
| 239 | } |
| 240 | STORE32_L(ibuf, i); |
| 241 | sha_init(&h); |
| 242 | sha_hash(&h, ibuf, sizeof(ibuf)); |
| 243 | sha_done(&h, obuf); |
| 244 | for (j = 0; i < 512; j++, i++) |
| 245 | *s++ = LOAD32_L(obuf + (4 * j)); |
| 246 | } |
| 247 | |
| 248 | static void fix(uint32 *s) |
| 249 | { |
| 250 | unsigned i, j, n; |
| 251 | uint32 d; |
| 252 | |
| 253 | for (i = 0; i < 512; i++) { |
| 254 | for (j = i & ~255u; j < ((i + 255) & ~255u); j++) { |
| 255 | if (i == j) |
| 256 | continue; |
| 257 | d = s[i] ^ s[j]; |
| 258 | n = 0; |
| 259 | if (!(d & 0xff000000)) n++; |
| 260 | if (!(d & 0x00ff0000)) n++; |
| 261 | if (!(d & 0x0000ff00)) n++; |
| 262 | if (!(d & 0x000000ff)) n++; |
| 263 | if (n >= 2) { |
| 264 | s[i] = U32(s[i] * 3); |
| 265 | goto fixed; |
| 266 | } |
| 267 | } |
| 268 | fixed:; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | int main(void) |
| 273 | { |
| 274 | uint32 s[512]; |
| 275 | unsigned i; |
| 276 | |
| 277 | mks(0x02917d59, s); |
| 278 | fix(s); |
| 279 | |
| 280 | puts("\ |
| 281 | /* -*-c-*-\n\ |
| 282 | *\n\ |
| 283 | * MARS tables [generated]\n\ |
| 284 | */\n\ |
| 285 | \n\ |
| 286 | #include <mLib/bits.h>\n\ |
| 287 | "); |
| 288 | |
| 289 | fputs("\ |
| 290 | /* --- The S-box --- */\n\ |
| 291 | \n\ |
| 292 | const uint32 mars_s[] = {\n\ |
| 293 | ", stdout); |
| 294 | for (i = 0; i < 512; i++) { |
| 295 | printf("0x%08lx", (unsigned long)s[i]); |
| 296 | if (i == 511) |
| 297 | fputs("\n};\n", stdout); |
| 298 | else if (i % 4 == 3) |
| 299 | fputs(",\n ", stdout); |
| 300 | else |
| 301 | fputs(", ", stdout); |
| 302 | } |
| 303 | |
| 304 | if (fclose(stdout)) { |
| 305 | fprintf(stderr, "error writing data\n"); |
| 306 | exit(EXIT_FAILURE); |
| 307 | } |
| 308 | |
| 309 | return (0); |
| 310 | } |
| 311 | |
| 312 | /*----- That's all, folks -------------------------------------------------*/ |