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