| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: hash.h,v 1.3 2000/06/17 11:23:27 mdw Exp $ |
| 4 | * |
| 5 | * Generic handling for message digest functions |
| 6 | * |
| 7 | * (c) 1998 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: hash.h,v $ |
| 33 | * Revision 1.3 2000/06/17 11:23:27 mdw |
| 34 | * Portability fix for broken compilers. |
| 35 | * |
| 36 | * Revision 1.2 1999/12/10 23:16:40 mdw |
| 37 | * Split mode macros into interface and implementation. |
| 38 | * |
| 39 | * Revision 1.1 1999/09/03 08:41:12 mdw |
| 40 | * Initial import. |
| 41 | * |
| 42 | */ |
| 43 | |
| 44 | #ifndef CATACOMB_HASH_H |
| 45 | #define CATACOMB_HASH_H |
| 46 | |
| 47 | #ifdef __cplusplus |
| 48 | extern "C" { |
| 49 | #endif |
| 50 | |
| 51 | /*----- Header files ------------------------------------------------------*/ |
| 52 | |
| 53 | #include <string.h> |
| 54 | |
| 55 | #include <mLib/bits.h> |
| 56 | |
| 57 | /*----- Macros ------------------------------------------------------------*/ |
| 58 | |
| 59 | /* --- @HASH_BUFFER@ --- * |
| 60 | * |
| 61 | * Arguments: @PRE@, @pre@ = prefixes for hash-specific definitions |
| 62 | * @ictx@ = pointer to context block for the hash |
| 63 | * @ibuf@ = pointer to input data to hash |
| 64 | * @isz@ = size of buffer |
| 65 | * |
| 66 | * Use: Handles buffering of input data to a hash function. The |
| 67 | * hash's compression function is called when the buffer is |
| 68 | * full. Note that the compression function can be called on |
| 69 | * data which is at odd alignments; it is expected to cope |
| 70 | * gracefully with this (possibly by copying the data into its |
| 71 | * internal buffer before starting). |
| 72 | */ |
| 73 | |
| 74 | #define HASH_BUFFER(PRE, pre, ictx, ibuf, isz) do { \ |
| 75 | pre##_ctx *_bctx = (ictx); \ |
| 76 | size_t _bsz = (isz); \ |
| 77 | const octet *_bbuf = (octet *)(ibuf); \ |
| 78 | \ |
| 79 | /* --- Add on the size done so far --- * \ |
| 80 | * \ |
| 81 | * Messy, because trapping overflow is difficult when you don't know \ |
| 82 | * how many bits you've actually got. \ |
| 83 | */ \ |
| 84 | \ |
| 85 | { \ |
| 86 | uint32 _l = U32(_bsz); \ |
| 87 | uint32 _h = ((_bsz & ~MASK32) >> 16) >> 16; \ |
| 88 | _bctx->nh += _h; \ |
| 89 | _bctx->nl += _l; \ |
| 90 | if (_bctx->nl < _l || _bctx->nl & ~MASK32) \ |
| 91 | _bctx->nh++; \ |
| 92 | } \ |
| 93 | \ |
| 94 | /* --- Handle very small contributions --- */ \ |
| 95 | \ |
| 96 | if (_bctx->off + _bsz < PRE##_BUFSZ) { \ |
| 97 | memcpy(_bctx->buf + _bctx->off, _bbuf, _bsz); \ |
| 98 | _bctx->off += _bsz; \ |
| 99 | } else { \ |
| 100 | \ |
| 101 | /* --- Handle an initial partial buffer --- */ \ |
| 102 | \ |
| 103 | if (_bctx->off) { \ |
| 104 | size_t s = PRE##_BUFSZ - _bctx->off; \ |
| 105 | memcpy(_bctx->buf + _bctx->off, _bbuf, s); \ |
| 106 | pre##_compress(_bctx, _bctx->buf); \ |
| 107 | _bsz -= s; _bbuf += s; \ |
| 108 | } \ |
| 109 | \ |
| 110 | /* --- Do whole buffers while we can --- */ \ |
| 111 | \ |
| 112 | while (_bsz >= PRE##_BUFSZ) { \ |
| 113 | pre##_compress(_bctx, _bbuf); \ |
| 114 | _bsz -= PRE##_BUFSZ; _bbuf += PRE##_BUFSZ; \ |
| 115 | } \ |
| 116 | \ |
| 117 | /* --- And wrap up at the end --- */ \ |
| 118 | \ |
| 119 | if (_bsz) \ |
| 120 | memcpy(_bctx->buf, _bbuf, _bsz); \ |
| 121 | _bctx->off = _bsz; \ |
| 122 | } \ |
| 123 | } while (0) |
| 124 | |
| 125 | /* --- @HASH_PAD@ --- * |
| 126 | * |
| 127 | * Arguments: @PRE@, @pre@ = prefixes for hash-specific definitions |
| 128 | * @ictx@ = pointer to context block for the hash |
| 129 | * @term@ = terminator character to write following the data |
| 130 | * @pad@ = pad character to fill with |
| 131 | * @diff@ = size of space to leave at the end of the last block |
| 132 | * |
| 133 | * Use: Does padding for message digest functions. |
| 134 | */ |
| 135 | |
| 136 | #define HASH_PAD(PRE, pre, ictx, term, pad, diff) do { \ |
| 137 | pre##_ctx *_pctx = (ictx); \ |
| 138 | \ |
| 139 | _pctx->buf[_pctx->off] = term; \ |
| 140 | _pctx->off++; \ |
| 141 | if (_pctx->off > PRE##_BUFSZ - diff) { \ |
| 142 | if (_pctx->off < PRE##_BUFSZ) \ |
| 143 | memset(_pctx->buf + _pctx->off, pad, PRE##_BUFSZ - _pctx->off); \ |
| 144 | pre##_compress(_pctx, _pctx->buf); \ |
| 145 | memset(_pctx->buf, pad, PRE##_BUFSZ - diff); \ |
| 146 | } else \ |
| 147 | memset(_pctx->buf + _pctx->off, pad, \ |
| 148 | PRE##_BUFSZ - _pctx->off - diff); \ |
| 149 | } while (0) |
| 150 | |
| 151 | /* --- @HASH_MD5STRENGTH@ --- * |
| 152 | * |
| 153 | * Arguments: @PRE@, @pre@ = prefixes for hash-specific definitions |
| 154 | * @ictx@ = pointer to context block for the hash |
| 155 | * |
| 156 | * Use: Does MD5-style MD strengthening. The data is terminated |
| 157 | * by a single set bit, padded with zero bits, and then a 64- |
| 158 | * bit length is written, little-end first. |
| 159 | */ |
| 160 | |
| 161 | #define HASH_MD5STRENGTH(PRE, pre, ictx) do { \ |
| 162 | pre##_ctx *_mctx = (ictx); \ |
| 163 | HASH_PAD(PRE, pre, _mctx, 0x80u, 0, 8); \ |
| 164 | STORE32_L(_mctx->buf + PRE##_BUFSZ - 8, _mctx->nl << 3); \ |
| 165 | STORE32_L(_mctx->buf + PRE##_BUFSZ - 4, \ |
| 166 | (_mctx->nl >> 29) | (_mctx->nh << 3)); \ |
| 167 | pre##_compress(_mctx, _mctx->buf); \ |
| 168 | } while (0) |
| 169 | |
| 170 | /* --- @HASH_TEST@ --- * |
| 171 | * |
| 172 | * Arguments: @PRE@, @pre@ = prefixes for hash-specfic definitions |
| 173 | * |
| 174 | * Use: Standard test rig for hash functions. |
| 175 | */ |
| 176 | |
| 177 | #ifdef TEST_RIG |
| 178 | |
| 179 | #include <mLib/quis.h> |
| 180 | #include <mLib/testrig.h> |
| 181 | |
| 182 | #define HASH_TEST(PRE, pre) \ |
| 183 | \ |
| 184 | static int verify(dstr *v) \ |
| 185 | { \ |
| 186 | pre##_ctx ctx; \ |
| 187 | int ok = 1; \ |
| 188 | int i; \ |
| 189 | octet *p; \ |
| 190 | int szs[] = { 1, 7, 192, -1, 0 }, *ip; \ |
| 191 | size_t sz; \ |
| 192 | dstr d; \ |
| 193 | \ |
| 194 | dstr_create(&d); \ |
| 195 | dstr_ensure(&d, PRE##_HASHSZ); \ |
| 196 | d.len = PRE##_HASHSZ; \ |
| 197 | \ |
| 198 | for (ip = szs; *ip; ip++) { \ |
| 199 | i = *ip; \ |
| 200 | sz = v[0].len; \ |
| 201 | if (i == -1) \ |
| 202 | i = sz; \ |
| 203 | if (i > sz) \ |
| 204 | continue; \ |
| 205 | p = (octet *)v[0].buf; \ |
| 206 | pre##_init(&ctx); \ |
| 207 | while (sz) { \ |
| 208 | if (i > sz) \ |
| 209 | i = sz; \ |
| 210 | pre##_hash(&ctx, p, i); \ |
| 211 | p += i; \ |
| 212 | sz -= i; \ |
| 213 | } \ |
| 214 | pre##_done(&ctx, d.buf); \ |
| 215 | if (memcmp(d.buf, v[1].buf, PRE##_HASHSZ) != 0) { \ |
| 216 | printf("\nfail:\n\tstep = %i\n\tinput = `%s'\n\texpected = ", \ |
| 217 | *ip, v[0].buf); \ |
| 218 | type_hex.dump(&v[1], stdout); \ |
| 219 | fputs("\n\tcomputed = ", stdout); \ |
| 220 | type_hex.dump(&d, stdout); \ |
| 221 | putchar('\n'); \ |
| 222 | ok = 0; \ |
| 223 | } \ |
| 224 | } \ |
| 225 | \ |
| 226 | dstr_destroy(&d); \ |
| 227 | return (ok); \ |
| 228 | } \ |
| 229 | \ |
| 230 | static test_chunk defs[] = { \ |
| 231 | { #pre, verify, { &type_string, &type_hex, 0 } }, \ |
| 232 | { 0, 0, { 0 } } \ |
| 233 | }; \ |
| 234 | \ |
| 235 | int main(int argc, char *argv[]) \ |
| 236 | { \ |
| 237 | ego(argv[0]); \ |
| 238 | test_run(argc, argv, defs, SRCDIR"/tests/" #pre); \ |
| 239 | return (0); \ |
| 240 | } |
| 241 | |
| 242 | #else |
| 243 | # define HASH_TEST(PRE, pre) |
| 244 | #endif |
| 245 | |
| 246 | /*----- That's all, folks -------------------------------------------------*/ |
| 247 | |
| 248 | #ifdef __cplusplus |
| 249 | } |
| 250 | #endif |
| 251 | |
| 252 | #endif |