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79ba130c | 1 | /* -*-c-*- |
79ba130c | 2 | * |
3 | * Definitions for HMAC and NMAC | |
4 | * | |
5 | * (c) 1999 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
79ba130c | 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. | |
45c0fd36 | 16 | * |
79ba130c | 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. | |
45c0fd36 | 21 | * |
79ba130c | 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 | ||
79ba130c | 28 | #ifndef CATACOMB_HMAC_DEF_H |
29 | #define CATACOMB_HMAC_DEF_H | |
30 | ||
31 | #ifdef __cplusplus | |
32 | extern "C" { | |
33 | #endif | |
34 | ||
35 | /*----- Header files ------------------------------------------------------*/ | |
36 | ||
28ef1f45 | 37 | #include <assert.h> |
79ba130c | 38 | #include <stdlib.h> |
39 | #include <string.h> | |
40 | ||
41 | #include <mLib/bits.h> | |
42 | #include <mLib/sub.h> | |
43 | ||
28ef1f45 | 44 | #ifndef CATACOMB_ARENA_H |
45 | # include "arena.h" | |
46 | #endif | |
47 | ||
79ba130c | 48 | #ifndef CATACOMB_GMAC_H |
49 | # include "gmac.h" | |
50 | #endif | |
51 | ||
52 | #ifndef CATACOMB_PARANOIA_H | |
53 | # include "paranoia.h" | |
54 | #endif | |
55 | ||
56 | /*----- Macros ------------------------------------------------------------*/ | |
57 | ||
58 | /* --- @HMAC_DEF@ --- * | |
59 | * | |
60 | * Arguments: @PRE@, @pre@ = prefixes for the underlying hash function | |
61 | * | |
62 | * Use: Creates implementations for the HMAC and NMAC functions. | |
63 | */ | |
64 | ||
aaae9cab MW |
65 | #define HMAC_DEF(PRE, pre) HMAC_DEFX(PRE, pre, #pre, #pre) |
66 | #define HMAC_DEFX(PRE, pre, name, fname) \ | |
79ba130c | 67 | \ |
28ef1f45 | 68 | /* --- Useful constants --- */ \ |
69 | \ | |
c148759d MW |
70 | const octet pre##_hmackeysz[] = \ |
71 | { KSZ_ANY | KSZ_16BIT, PRE##_STATESZ/256, PRE##_STATESZ%256 }; \ | |
72 | const octet pre##_sslmackeysz[] = \ | |
73 | { KSZ_ANY | KSZ_16BIT, PRE##_STATESZ/256, PRE##_STATESZ%256 }; \ | |
74 | const octet pre##_nmackeysz[] = \ | |
75 | { KSZ_SET | KSZ_16BIT, \ | |
76 | 2*PRE##_STATESZ/256, 2*PRE##_STATESZ%256, 0, 0 }; \ | |
28ef1f45 | 77 | \ |
79ba130c | 78 | /* --- @pre_nmacinit@ --- * \ |
79 | * \ | |
80 | * Arguments: @pre_macctx *key@ = pointer to a MAC key object \ | |
81 | * @const void *ok@ = pointer to outer hash init vector \ | |
82 | * @const void *ik@ = pointer to inner hash init vector \ | |
83 | * \ | |
84 | * Returns: --- \ | |
85 | * \ | |
86 | * Use: Initializes a MAC key for doing NMAC hashing. \ | |
87 | */ \ | |
88 | \ | |
89 | void pre##_nmacinit(pre##_mackey *key, const void *ok, const void *ik) \ | |
90 | { \ | |
c850c0da | 91 | memcpy(key->ochain, ok, PRE##_STATESZ); \ |
92 | memcpy(key->ichain, ik, PRE##_STATESZ); \ | |
79ba130c | 93 | key->ocount = key->icount = 0; \ |
94 | } \ | |
95 | \ | |
96 | /* --- @pre_hmacinit@ --- * \ | |
97 | * \ | |
98 | * Arguments: @pre_mackey *key@ = pointer to MAC key object \ | |
99 | * @const void *k@ = pointer to key to use \ | |
100 | * @size_t sz@ = size of key data \ | |
101 | * \ | |
102 | * Returns: --- \ | |
103 | * \ | |
104 | * Use: Initializes a MAC key for doing HMAC hashing. Keys \ | |
105 | * longer than the hash function's output size aren't very \ | |
106 | * useful, but are accepted. Keys longer than the hash's \ | |
107 | * block size are also accepted; they are hashed before \ | |
108 | * use, as specified in RFC2104. \ | |
109 | */ \ | |
110 | \ | |
111 | void pre##_hmacinit(pre##_mackey *key, const void *k, size_t sz) \ | |
112 | { \ | |
113 | int i; \ | |
114 | const octet *kbuf = k; \ | |
115 | pre##_ctx ctx; \ | |
94df4e8c | 116 | octet hbuf[PRE##_HASHSZ], buf[PRE##_BUFSZ]; \ |
79ba130c | 117 | \ |
118 | if (sz > PRE##_BUFSZ) { \ | |
119 | pre##_init(&ctx); \ | |
120 | pre##_hash(&ctx, k, sz); \ | |
94df4e8c MW |
121 | pre##_done(&ctx, hbuf); \ |
122 | kbuf = hbuf; \ | |
79ba130c | 123 | sz = PRE##_HASHSZ; \ |
124 | } \ | |
125 | \ | |
126 | pre##_init(&ctx); \ | |
94df4e8c MW |
127 | memset(buf, 0x5c, PRE##_BUFSZ); \ |
128 | for (i = 0; i < sz; i++) buf[i] ^= kbuf[i]; \ | |
129 | pre##_hash(&ctx, buf, PRE##_BUFSZ); \ | |
130 | key->ocount = pre##_state(&ctx, key->ochain); \ | |
79ba130c | 131 | \ |
132 | pre##_init(&ctx); \ | |
94df4e8c MW |
133 | memset(buf, 0x36, PRE##_BUFSZ); \ |
134 | for (i = 0; i < sz; i++) buf[i] ^= kbuf[i]; \ | |
135 | pre##_hash(&ctx, buf, PRE##_BUFSZ); \ | |
136 | key->icount = pre##_state(&ctx, key->ichain); \ | |
79ba130c | 137 | \ |
79ba130c | 138 | BURN(ctx); \ |
139 | } \ | |
140 | \ | |
36c67859 | 141 | /* --- @pre_sslmacinit@ --- * \ |
142 | * \ | |
143 | * Arguments: @pre_mackey *key@ = pointer to MAC key object \ | |
144 | * @const void *k@ = pointer to key to use \ | |
145 | * @size_t sz@ = size of key data \ | |
146 | * \ | |
147 | * Returns: --- \ | |
148 | * \ | |
149 | * Use: Initializes a MAC key for doing hasing using the SSL3 \ | |
150 | * variant of HMAC. \ | |
151 | */ \ | |
152 | \ | |
153 | void pre##_sslmacinit(pre##_mackey *key, const void *k, size_t sz) \ | |
154 | { \ | |
36c67859 | 155 | const octet *kbuf = k; \ |
156 | pre##_ctx ctx; \ | |
94df4e8c | 157 | octet hbuf[PRE##_HASHSZ], buf[PRE##_BUFSZ]; \ |
36c67859 | 158 | \ |
159 | if (sz > PRE##_BUFSZ) { \ | |
160 | pre##_init(&ctx); \ | |
161 | pre##_hash(&ctx, k, sz); \ | |
94df4e8c MW |
162 | pre##_done(&ctx, hbuf); \ |
163 | kbuf = hbuf; \ | |
36c67859 | 164 | sz = PRE##_HASHSZ; \ |
165 | } \ | |
166 | \ | |
167 | pre##_init(&ctx); \ | |
94df4e8c MW |
168 | memcpy(buf, kbuf, sz); \ |
169 | memset(buf + sz, 0x5c, PRE##_BUFSZ - sz); \ | |
170 | pre##_hash(&ctx, buf, PRE##_BUFSZ); \ | |
171 | key->ocount = pre##_state(&ctx, key->ochain); \ | |
36c67859 | 172 | \ |
173 | pre##_init(&ctx); \ | |
94df4e8c MW |
174 | memcpy(buf, kbuf, sz); \ |
175 | memset(buf + sz, 0x36, PRE##_BUFSZ - sz); \ | |
176 | pre##_hash(&ctx, buf, PRE##_BUFSZ); \ | |
177 | key->icount = pre##_state(&ctx, key->ichain); \ | |
36c67859 | 178 | \ |
36c67859 | 179 | BURN(ctx); \ |
180 | } \ | |
181 | \ | |
79ba130c | 182 | /* --- @pre_macinit@ --- * \ |
183 | * \ | |
184 | * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \ | |
185 | * @const pre_mackey *key@ = pointer to MAC key block \ | |
186 | * \ | |
187 | * Returns: --- \ | |
188 | * \ | |
189 | * Use: Instantiates a MAC context from a key block. \ | |
190 | */ \ | |
191 | \ | |
192 | void pre##_macinit(pre##_macctx *ctx, const pre##_mackey *key) \ | |
193 | { \ | |
c850c0da | 194 | memcpy(ctx->chain, key->ochain, PRE##_STATESZ); \ |
79ba130c | 195 | ctx->count = key->ocount; \ |
196 | pre##_set(&ctx->ctx, key->ichain, key->icount); \ | |
197 | } \ | |
198 | \ | |
199 | /* --- @pre_machash@ --- * \ | |
200 | * \ | |
201 | * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \ | |
202 | * @const void *buf@ = pointer to buffer \ | |
203 | * @size_t sz@ = size of the buffer \ | |
204 | * \ | |
205 | * Returns: --- \ | |
206 | * \ | |
207 | * Use: Hashes a buffer. \ | |
208 | */ \ | |
209 | \ | |
210 | void pre##_machash(pre##_macctx *ctx, const void *buf, size_t sz) \ | |
211 | { \ | |
212 | pre##_hash(&ctx->ctx, buf, sz); \ | |
213 | } \ | |
214 | \ | |
215 | /* --- @pre_macdone@ --- * \ | |
216 | * \ | |
217 | * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \ | |
218 | * @void *mac@ = pointer to buffer to receive MAC \ | |
219 | * \ | |
220 | * Returns: --- \ | |
221 | * \ | |
222 | * Use: Returns the result of a MAC computation. \ | |
223 | */ \ | |
224 | \ | |
225 | void pre##_macdone(pre##_macctx *ctx, void *mac) \ | |
226 | { \ | |
227 | pre##_done(&ctx->ctx, mac); \ | |
228 | pre##_set(&ctx->ctx, ctx->chain, ctx->count); \ | |
229 | pre##_hash(&ctx->ctx, mac, PRE##_HASHSZ); \ | |
230 | pre##_done(&ctx->ctx, mac); \ | |
231 | } \ | |
232 | \ | |
233 | /* --- Generic MAC interface --- */ \ | |
234 | \ | |
4dafd519 | 235 | static const gmac_ops gkops, gnkops, gsslkops; \ |
2a62e96d | 236 | static const ghash_ops gops, gnops, gsslops; \ |
79ba130c | 237 | \ |
238 | typedef struct gkctx { \ | |
239 | gmac m; \ | |
2a62e96d | 240 | const ghash_ops *gops; \ |
79ba130c | 241 | pre##_mackey k; \ |
242 | } gkctx; \ | |
243 | \ | |
244 | typedef struct gctx { \ | |
245 | ghash h; \ | |
246 | pre##_macctx c; \ | |
a351d052 | 247 | octet buf[PRE##_HASHSZ]; \ |
79ba130c | 248 | } gctx; \ |
249 | \ | |
250 | static ghash *gkinit(gmac *m) \ | |
251 | { \ | |
252 | gkctx *gk = (gkctx *)m; \ | |
28ef1f45 | 253 | gctx *g = S_CREATE(gctx); \ |
2a62e96d | 254 | g->h.ops = gk->gops; \ |
79ba130c | 255 | pre##_macinit(&g->c, &gk->k); \ |
256 | return (&g->h); \ | |
257 | } \ | |
258 | \ | |
259 | static gmac *gkey(const void *k, size_t sz) \ | |
260 | { \ | |
28ef1f45 | 261 | gkctx *gk = S_CREATE(gkctx); \ |
79ba130c | 262 | gk->m.ops = &gkops; \ |
2a62e96d | 263 | gk->gops = &gops; \ |
79ba130c | 264 | pre##_hmacinit(&gk->k, k, sz); \ |
265 | return (&gk->m); \ | |
266 | } \ | |
267 | \ | |
2a62e96d | 268 | static gmac *gnkey(const void *k, size_t sz) \ |
269 | { \ | |
270 | gkctx *gk = S_CREATE(gkctx); \ | |
271 | const octet *kk = k; \ | |
272 | assert(keysz(sz, pre##_nmackeysz) == sz); \ | |
4dafd519 | 273 | gk->m.ops = &gnkops; \ |
2a62e96d | 274 | gk->gops = &gnops; \ |
275 | pre##_nmacinit(&gk->k, kk, kk + PRE##_STATESZ); \ | |
276 | return (&gk->m); \ | |
277 | } \ | |
278 | \ | |
36c67859 | 279 | static gmac *gsslkey(const void *k, size_t sz) \ |
280 | { \ | |
281 | gkctx *gk = S_CREATE(gkctx); \ | |
4dafd519 | 282 | gk->m.ops = &gsslkops; \ |
2a62e96d | 283 | gk->gops = &gsslops; \ |
36c67859 | 284 | pre##_sslmacinit(&gk->k, k, sz); \ |
285 | return (&gk->m); \ | |
286 | } \ | |
287 | \ | |
79ba130c | 288 | static void ghhash(ghash *h, const void *p, size_t sz) \ |
289 | { \ | |
290 | gctx *g = (gctx *)h; \ | |
291 | pre##_machash(&g->c, p, sz); \ | |
292 | } \ | |
293 | \ | |
a351d052 | 294 | static octet *ghdone(ghash *h, void *buf) \ |
79ba130c | 295 | { \ |
296 | gctx *g = (gctx *)h; \ | |
a351d052 | 297 | if (!buf) \ |
298 | buf = g->buf; \ | |
79ba130c | 299 | pre##_macdone(&g->c, buf); \ |
a351d052 | 300 | return (buf); \ |
79ba130c | 301 | } \ |
302 | \ | |
d2fdbc2c | 303 | static ghash *ghcopy(ghash *h) \ |
304 | { \ | |
305 | gctx *g = (gctx *)h; \ | |
306 | gctx *gg = S_CREATE(gctx); \ | |
307 | memcpy(gg, g, sizeof(gctx)); \ | |
308 | return (&gg->h); \ | |
309 | } \ | |
310 | \ | |
79ba130c | 311 | static void ghdestroy(ghash *h) \ |
312 | { \ | |
313 | gctx *g = (gctx *)h; \ | |
28ef1f45 | 314 | BURN(*g); \ |
315 | S_DESTROY(g); \ | |
79ba130c | 316 | } \ |
317 | \ | |
318 | static void gkdestroy(gmac *m) \ | |
319 | { \ | |
320 | gkctx *gk = (gkctx *)m; \ | |
28ef1f45 | 321 | BURN(*gk); \ |
322 | S_DESTROY(gk); \ | |
323 | } \ | |
324 | \ | |
325 | static ghash *ghinit(void) \ | |
326 | { \ | |
327 | assert(((void)"Attempt to instantiate an unkeyed MAC", 0)); \ | |
328 | return (0); \ | |
79ba130c | 329 | } \ |
330 | \ | |
2a62e96d | 331 | const gcmac pre##_nmac = \ |
aaae9cab | 332 | { name "-nmac", PRE##_HASHSZ, pre##_nmackeysz, gnkey }; \ |
28ef1f45 | 333 | const gcmac pre##_hmac = \ |
aaae9cab | 334 | { name "-hmac", PRE##_HASHSZ, pre##_hmackeysz, gkey }; \ |
36c67859 | 335 | const gcmac pre##_sslmac = \ |
aaae9cab | 336 | { name "-sslmac", PRE##_HASHSZ, pre##_sslmackeysz, gsslkey }; \ |
28ef1f45 | 337 | static const gmac_ops gkops = { &pre##_hmac, gkinit, gkdestroy }; \ |
2a62e96d | 338 | static const gmac_ops gnkops = { &pre##_nmac, gkinit, gkdestroy }; \ |
339 | static const gmac_ops gsslkops = { &pre##_sslmac, gkinit, gkdestroy }; \ | |
aaae9cab | 340 | static const gchash gch = { name "-hmac", PRE##_HASHSZ, ghinit }; \ |
79ba130c | 341 | static const ghash_ops gops = \ |
2a62e96d | 342 | { &gch, ghhash, ghdone, ghdestroy, ghcopy }; \ |
aaae9cab | 343 | static const gchash gnch = { name "-nmac", PRE##_HASHSZ, ghinit }; \ |
2a62e96d | 344 | static const ghash_ops gnops = \ |
4dafd519 | 345 | { &gnch, ghhash, ghdone, ghdestroy, ghcopy }; \ |
aaae9cab | 346 | static const gchash gsslch = { name "-sslmac", PRE##_HASHSZ, ghinit }; \ |
2a62e96d | 347 | static const ghash_ops gsslops = \ |
4dafd519 | 348 | { &gsslch, ghhash, ghdone, ghdestroy, ghcopy }; \ |
79ba130c | 349 | \ |
aaae9cab MW |
350 | HMAC_TESTX(PRE, pre, name, fname) |
351 | ||
352 | #define HMAC_TEST(PRE, pre) HMAC_TESTX(PRE, pre, #pre, #pre) | |
79ba130c | 353 | |
354 | /* --- @HMAC_TEST@ --- * | |
355 | * | |
356 | * Arguments: @PRE@, @pre@ = prefixes for hash-specfic definitions | |
357 | * | |
358 | * Use: Standard test rig for MAC functions. | |
359 | */ | |
360 | ||
361 | #ifdef TEST_RIG | |
362 | ||
363 | #include <stdio.h> | |
364 | ||
365 | #include <mLib/dstr.h> | |
366 | #include <mLib/quis.h> | |
367 | #include <mLib/testrig.h> | |
368 | ||
aaae9cab | 369 | #define HMAC_TESTX(PRE, pre, name, fname) \ |
79ba130c | 370 | \ |
371 | static int macverify(dstr *v) \ | |
372 | { \ | |
373 | pre##_macctx cctx; \ | |
374 | pre##_mackey ckey; \ | |
375 | int ok = 1; \ | |
376 | int i; \ | |
377 | octet *p; \ | |
378 | int szs[] = { 1, 7, 192, -1, 0 }, *ip; \ | |
379 | size_t csz; \ | |
380 | dstr d; \ | |
381 | \ | |
382 | dstr_create(&d); \ | |
383 | dstr_ensure(&d, PRE##_HASHSZ); \ | |
384 | d.len = PRE##_HASHSZ; \ | |
385 | \ | |
386 | pre##_hmacinit(&ckey, v[1].buf, v[1].len); \ | |
387 | \ | |
388 | for (ip = szs; *ip; ip++) { \ | |
389 | i = *ip; \ | |
390 | csz = v[0].len; \ | |
391 | if (i == -1) \ | |
392 | i = csz; \ | |
393 | if (i > csz) \ | |
394 | continue; \ | |
395 | p = (octet *)v[0].buf; \ | |
396 | pre##_macinit(&cctx, &ckey); \ | |
397 | while (csz) { \ | |
398 | if (i > csz) \ | |
399 | i = csz; \ | |
400 | pre##_machash(&cctx, p, i); \ | |
401 | p += i; \ | |
402 | csz -= i; \ | |
403 | } \ | |
404 | pre##_macdone(&cctx, d.buf); \ | |
405 | if (memcmp(d.buf, v[2].buf, PRE##_HASHSZ) != 0) { \ | |
406 | printf("\nfail:\n\tstep = %i\n\tinput = `%s'\n\tkey = ", \ | |
407 | *ip, v[0].buf); \ | |
408 | type_hex.dump(&v[1], stdout); \ | |
409 | fputs("\n\texpected = ", stdout); \ | |
410 | type_hex.dump(&v[2], stdout); \ | |
411 | fputs("\n\tcomputed = ", stdout); \ | |
412 | type_hex.dump(&d, stdout); \ | |
413 | putchar('\n'); \ | |
414 | ok = 0; \ | |
415 | } \ | |
416 | } \ | |
417 | \ | |
418 | dstr_destroy(&d); \ | |
419 | return (ok); \ | |
420 | } \ | |
421 | \ | |
422 | static test_chunk macdefs[] = { \ | |
aaae9cab | 423 | { name "-hmac", macverify, \ |
79ba130c | 424 | { &type_string, &type_hex, &type_hex, 0 } }, \ |
425 | { 0, 0, { 0 } } \ | |
426 | }; \ | |
427 | \ | |
428 | int main(int argc, char *argv[]) \ | |
429 | { \ | |
430 | ego(argv[0]); \ | |
aaae9cab | 431 | test_run(argc, argv, macdefs, SRCDIR"/t/" fname); \ |
79ba130c | 432 | return (0); \ |
433 | } | |
434 | ||
435 | #else | |
aaae9cab | 436 | # define HMAC_TESTX(PRE, pre, name, fname) |
79ba130c | 437 | #endif |
438 | ||
439 | /*----- That's all, folks -------------------------------------------------*/ | |
440 | ||
441 | #ifdef __cplusplus | |
442 | } | |
443 | #endif | |
444 | ||
445 | #endif |