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5c3f75ec | 1 | /* -*-c-*- |
5c3f75ec | 2 | * |
3 | * Catcrypt signatures | |
4 | * | |
5 | * (c) 2004 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
5c3f75ec | 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 | * |
5c3f75ec | 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 | * |
5c3f75ec | 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 | ||
cd6eca43 MW |
30 | #define _FILE_OFFSET_BITS 64 |
31 | ||
5c3f75ec | 32 | #include <stdlib.h> |
33 | ||
34 | #include <mLib/report.h> | |
35 | ||
36 | #include "rand.h" | |
37 | #include "sha.h" | |
38 | #include "has160.h" | |
39 | ||
40 | #include "ec.h" | |
41 | #include "ec-keys.h" | |
42 | #include "dh.h" | |
43 | #include "gdsa.h" | |
44 | #include "gkcdsa.h" | |
45 | #include "rsa.h" | |
46 | ||
47 | #include "cc.h" | |
48 | ||
49 | /*----- Main code ---------------------------------------------------------*/ | |
50 | ||
51 | /* --- RSA PKCS1 --- */ | |
52 | ||
53 | typedef struct rsap1_sigctx { | |
54 | sig s; | |
55 | rsa_privctx rp; | |
56 | pkcs1 p1; | |
57 | } rsap1_sigctx; | |
58 | ||
59 | static sig *rsap1_siginit(key *k, void *kd, const gchash *hc) | |
60 | { | |
61 | rsap1_sigctx *rs = CREATE(rsap1_sigctx); | |
62 | rsa_privcreate(&rs->rp, kd, &rand_global); | |
63 | rs->p1.r = &rand_global; | |
64 | rs->p1.ep = hc->name; | |
65 | rs->p1.epsz = strlen(hc->name) + 1; | |
66 | rs->s.h = 0; | |
67 | return (&rs->s); | |
68 | } | |
69 | ||
70 | static int rsap1_sigdoit(sig *s, dstr *d) | |
71 | { | |
72 | rsap1_sigctx *rs = (rsap1_sigctx *)s; | |
73 | size_t n; | |
74 | mp *m = rsa_sign(&rs->rp, MP_NEW, | |
75 | GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz, | |
76 | pkcs1_sigencode, &rs->p1); | |
77 | if (!m) return (-1); | |
78 | n = mp_octets(rs->rp.rp->n); dstr_ensure(d, n); mp_storeb(m, d->buf, n); | |
79 | d->len += n; mp_drop(m); | |
80 | return (0); | |
81 | } | |
82 | ||
83 | static const char *rsa_lengthcheck(mp *n) | |
84 | { | |
85 | if (mp_bits(n) < 1024) return ("key too short"); | |
86 | return (0); | |
87 | } | |
88 | ||
89 | static const char *rsap1_sigcheck(sig *s) | |
90 | { | |
91 | rsap1_sigctx *rs = (rsap1_sigctx *)s; | |
92 | const char *e; | |
93 | if ((e = rsa_lengthcheck(rs->rp.rp->n)) != 0) return (e); | |
94 | return (0); | |
95 | } | |
96 | ||
97 | static void rsap1_sigdestroy(sig *s) | |
98 | { | |
99 | rsap1_sigctx *rs = (rsap1_sigctx *)s; | |
100 | rsa_privdestroy(&rs->rp); | |
101 | DESTROY(rs); | |
102 | } | |
103 | ||
104 | static const sigops rsap1_sig = { | |
105 | rsa_privfetch, sizeof(rsa_priv), | |
106 | rsap1_siginit, rsap1_sigdoit, rsap1_sigcheck, rsap1_sigdestroy | |
107 | }; | |
108 | ||
109 | typedef struct rsap1_vrfctx { | |
110 | sig s; | |
111 | rsa_pubctx rp; | |
112 | pkcs1 p1; | |
113 | } rsap1_vrfctx; | |
114 | ||
115 | static sig *rsap1_vrfinit(key *k, void *kd, const gchash *hc) | |
116 | { | |
117 | rsap1_vrfctx *rv = CREATE(rsap1_vrfctx); | |
118 | rsa_pubcreate(&rv->rp, kd); | |
119 | rv->p1.r = &rand_global; | |
120 | rv->p1.ep = hc->name; | |
121 | rv->p1.epsz = strlen(hc->name) + 1; | |
122 | rv->s.h = 0; | |
123 | return (&rv->s); | |
124 | } | |
125 | ||
126 | static int rsap1_vrfdoit(sig *s, dstr *d) | |
127 | { | |
128 | rsap1_vrfctx *rv = (rsap1_vrfctx *)s; | |
129 | mp *m = mp_loadb(MP_NEW, d->buf, d->len); | |
130 | int rc = rsa_verify(&rv->rp, m, | |
131 | GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz, | |
132 | 0, pkcs1_sigdecode, &rv->p1); | |
133 | mp_drop(m); | |
134 | return (rc); | |
135 | } | |
136 | ||
137 | static const char *rsap1_vrfcheck(sig *s) | |
138 | { | |
139 | rsap1_vrfctx *rv = (rsap1_vrfctx *)s; | |
140 | const char *e; | |
141 | if ((e = rsa_lengthcheck(rv->rp.rp->n)) != 0) return (e); | |
142 | return (0); | |
143 | } | |
144 | ||
145 | static void rsap1_vrfdestroy(sig *s) | |
146 | { | |
147 | rsap1_vrfctx *rv = (rsap1_vrfctx *)s; | |
148 | rsa_pubdestroy(&rv->rp); | |
149 | DESTROY(rv); | |
150 | } | |
151 | ||
152 | static const sigops rsap1_vrf = { | |
153 | rsa_pubfetch, sizeof(rsa_pub), | |
154 | rsap1_vrfinit, rsap1_vrfdoit, rsap1_vrfcheck, rsap1_vrfdestroy | |
155 | }; | |
156 | ||
157 | /* --- RSA PSS --- */ | |
158 | ||
159 | static const gccipher *getmgf(key *k, const gchash *hc) | |
160 | { | |
161 | dstr d = DSTR_INIT; | |
162 | const gccipher *gc; | |
163 | const char *mm; | |
164 | ||
165 | if ((mm = key_getattr(0, k, "mgf")) == 0) { | |
166 | dstr_putf(&d, "%s-mgf", hc->name); | |
167 | mm = d.buf; | |
168 | } | |
169 | if ((gc = gcipher_byname(mm)) == 0) | |
170 | die(EXIT_FAILURE, "unknown encryption scheme `%s'", mm); | |
171 | dstr_destroy(&d); | |
172 | return (gc); | |
173 | } | |
174 | ||
175 | typedef struct rsapss_sigctx { | |
176 | sig s; | |
177 | rsa_privctx rp; | |
178 | pss p; | |
179 | } rsapss_sigctx; | |
180 | ||
181 | static sig *rsapss_siginit(key *k, void *kd, const gchash *hc) | |
182 | { | |
183 | rsapss_sigctx *rs = CREATE(rsapss_sigctx); | |
184 | rsa_privcreate(&rs->rp, kd, &rand_global); | |
185 | rs->p.r = &rand_global; | |
186 | rs->p.cc = getmgf(k, hc); | |
187 | rs->p.ch = hc; | |
188 | rs->p.ssz = hc->hashsz; | |
189 | rsa_privdestroy(&rs->rp); | |
190 | return (&rs->s); | |
191 | } | |
192 | ||
193 | static int rsapss_sigdoit(sig *s, dstr *d) | |
194 | { | |
195 | rsapss_sigctx *rs = (rsapss_sigctx *)s; | |
196 | size_t n; | |
197 | mp *m = rsa_sign(&rs->rp, MP_NEW, | |
198 | GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz, | |
199 | pss_encode, &rs->p); | |
200 | if (!m) return (-1); | |
201 | n = mp_octets(rs->rp.rp->n); dstr_ensure(d, n); mp_storeb(m, d->buf, n); | |
45c0fd36 | 202 | d->len += n; mp_drop(m); |
5c3f75ec | 203 | return (0); |
204 | } | |
205 | ||
206 | static const char *rsapss_sigcheck(sig *s) | |
207 | { | |
208 | rsapss_sigctx *rs = (rsapss_sigctx *)s; | |
209 | const char *e; | |
210 | if ((e = rsa_lengthcheck(rs->rp.rp->n)) != 0) return (e); | |
211 | return (0); | |
212 | } | |
213 | ||
214 | static void rsapss_sigdestroy(sig *s) | |
215 | { | |
216 | rsapss_sigctx *rs = (rsapss_sigctx *)s; | |
217 | rsa_privdestroy(&rs->rp); | |
218 | DESTROY(rs); | |
219 | } | |
220 | ||
221 | static const sigops rsapss_sig = { | |
222 | rsa_privfetch, sizeof(rsa_priv), | |
223 | rsapss_siginit, rsapss_sigdoit, rsapss_sigcheck, rsapss_sigdestroy | |
224 | }; | |
225 | ||
226 | typedef struct rsapss_vrfctx { | |
227 | sig s; | |
228 | rsa_pubctx rp; | |
229 | pss p; | |
230 | } rsapss_vrfctx; | |
231 | ||
232 | static sig *rsapss_vrfinit(key *k, void *kd, const gchash *hc) | |
233 | { | |
234 | rsapss_vrfctx *rv = CREATE(rsapss_vrfctx); | |
235 | rsa_pubcreate(&rv->rp, kd); | |
236 | rv->p.r = &rand_global; | |
237 | rv->p.cc = getmgf(k, hc); | |
238 | rv->p.ch = hc; | |
239 | rv->p.ssz = hc->hashsz; | |
240 | return (&rv->s); | |
241 | } | |
242 | ||
243 | static int rsapss_vrfdoit(sig *s, dstr *d) | |
244 | { | |
245 | rsapss_vrfctx *rv = (rsapss_vrfctx *)s; | |
246 | mp *m = mp_loadb(MP_NEW, d->buf, d->len); | |
247 | int rc = rsa_verify(&rv->rp, m, | |
248 | GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz, | |
249 | 0, pss_decode, &rv->p); | |
250 | mp_drop(m); | |
251 | return (rc); | |
252 | } | |
253 | ||
254 | static const char *rsapss_vrfcheck(sig *s) | |
255 | { | |
256 | rsapss_vrfctx *rv = (rsapss_vrfctx *)s; | |
257 | const char *e; | |
258 | if ((e = rsa_lengthcheck(rv->rp.rp->n)) != 0) return (e); | |
259 | return (0); | |
260 | } | |
261 | ||
262 | static void rsapss_vrfdestroy(sig *s) | |
263 | { | |
264 | rsapss_vrfctx *rv = (rsapss_vrfctx *)s; | |
265 | rsa_pubdestroy(&rv->rp); | |
266 | DESTROY(rv); | |
267 | } | |
268 | ||
269 | static const sigops rsapss_vrf = { | |
270 | rsa_pubfetch, sizeof(rsa_pub), | |
271 | rsapss_vrfinit, rsapss_vrfdoit, rsapss_vrfcheck, rsapss_vrfdestroy | |
272 | }; | |
273 | ||
274 | /* --- DSA and ECDSA --- */ | |
275 | ||
276 | typedef struct dsa_sigctx { | |
277 | sig s; | |
278 | gdsa g; | |
279 | } dsa_sigctx; | |
280 | ||
281 | static void dsa_initcommon(dsa_sigctx *ds, const gchash *hc, | |
282 | const char *ktag) | |
283 | { | |
284 | ds->g.r = &rand_global; | |
285 | ds->g.h = hc; | |
286 | ds->g.u = MP_NEW; | |
287 | ds->s.h = 0; | |
288 | } | |
289 | ||
290 | static dsa_sigctx *dsa_doinit(key *k, const gprime_param *gp, | |
3688eb75 | 291 | mp *y, const gchash *hc, |
292 | group *(*makegroup)(const gprime_param *), | |
293 | const char *what) | |
5c3f75ec | 294 | { |
295 | dsa_sigctx *ds = CREATE(dsa_sigctx); | |
296 | dstr t = DSTR_INIT; | |
297 | ||
298 | key_fulltag(k, &t); | |
3688eb75 | 299 | if ((ds->g.g = makegroup(gp)) == 0) |
300 | die(EXIT_FAILURE, "bad %s group in key `%s'", what, t.buf); | |
5c3f75ec | 301 | ds->g.p = G_CREATE(ds->g.g); |
302 | if (G_FROMINT(ds->g.g, ds->g.p, y)) | |
303 | die(EXIT_FAILURE, "bad public key in key `%s'", t.buf); | |
304 | dsa_initcommon(ds, hc, t.buf); | |
305 | dstr_destroy(&t); | |
306 | return (ds); | |
307 | } | |
308 | ||
309 | static dsa_sigctx *ecdsa_doinit(key *k, const char *cstr, | |
310 | ec *y, const gchash *hc) | |
311 | { | |
312 | dsa_sigctx *ds = CREATE(dsa_sigctx); | |
313 | ec_info ei; | |
314 | const char *e; | |
315 | dstr t = DSTR_INIT; | |
316 | ||
317 | key_fulltag(k, &t); | |
318 | if ((e = ec_getinfo(&ei, cstr)) != 0) | |
319 | die(EXIT_FAILURE, "bad curve in key `%s': %s", t.buf, e); | |
320 | ds->g.g = group_ec(&ei); | |
321 | ds->g.p = G_CREATE(ds->g.g); | |
322 | if (G_FROMEC(ds->g.g, ds->g.p, y)) | |
323 | die(EXIT_FAILURE, "bad public key in key `%s'", t.buf); | |
324 | dsa_initcommon(ds, hc, t.buf); | |
325 | dstr_destroy(&t); | |
326 | return (ds); | |
327 | } | |
328 | ||
329 | static sig *dsa_siginit(key *k, void *kd, const gchash *hc) | |
330 | { | |
331 | dh_priv *dp = kd; | |
3688eb75 | 332 | dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime"); |
333 | ds->g.u = MP_COPY(dp->x); | |
334 | return (&ds->s); | |
335 | } | |
336 | ||
337 | static sig *bindsa_siginit(key *k, void *kd, const gchash *hc) | |
338 | { | |
339 | dh_priv *dp = kd; | |
340 | dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary"); | |
5c3f75ec | 341 | ds->g.u = MP_COPY(dp->x); |
342 | return (&ds->s); | |
343 | } | |
344 | ||
345 | static sig *ecdsa_siginit(key *k, void *kd, const gchash *hc) | |
346 | { | |
347 | ec_priv *ep = kd; | |
348 | dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc); | |
349 | ds->g.u = MP_COPY(ep->x); | |
350 | return (&ds->s); | |
351 | } | |
352 | ||
353 | static int dsa_sigdoit(sig *s, dstr *d) | |
354 | { | |
355 | dsa_sigctx *ds = (dsa_sigctx *)s; | |
356 | gdsa_sig ss = GDSA_SIG_INIT; | |
357 | size_t n = mp_octets(ds->g.g->r); | |
358 | ||
359 | gdsa_sign(&ds->g, &ss, GH_DONE(ds->s.h, 0), 0); | |
360 | dstr_ensure(d, 2 * n); | |
361 | mp_storeb(ss.r, d->buf, n); | |
362 | mp_storeb(ss.s, d->buf + n, n); | |
363 | d->len += 2 * n; | |
364 | mp_drop(ss.r); mp_drop(ss.s); | |
365 | return (0); | |
366 | } | |
367 | ||
368 | static const char *dsa_sigcheck(sig *s) | |
369 | { | |
370 | dsa_sigctx *ds = (dsa_sigctx *)s; | |
371 | const char *e; | |
372 | if ((e = G_CHECK(ds->g.g, &rand_global)) != 0) | |
373 | return (0); | |
374 | if (group_check(ds->g.g, ds->g.p)) | |
375 | return ("public key not in subgroup"); | |
376 | return (0); | |
377 | } | |
378 | ||
379 | static void dsa_sigdestroy(sig *s) | |
380 | { | |
381 | dsa_sigctx *ds = (dsa_sigctx *)s; | |
382 | G_DESTROY(ds->g.g, ds->g.p); | |
383 | mp_drop(ds->g.u); | |
384 | G_DESTROYGROUP(ds->g.g); | |
ef13e9a4 | 385 | DESTROY(ds); |
5c3f75ec | 386 | } |
387 | ||
388 | static const sigops dsa_sig = { | |
389 | dh_privfetch, sizeof(dh_priv), | |
390 | dsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy | |
391 | }; | |
392 | ||
3688eb75 | 393 | static const sigops bindsa_sig = { |
394 | dh_privfetch, sizeof(dh_priv), | |
395 | bindsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy | |
396 | }; | |
397 | ||
5c3f75ec | 398 | static const sigops ecdsa_sig = { |
399 | ec_privfetch, sizeof(ec_priv), | |
400 | ecdsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy | |
401 | }; | |
402 | ||
403 | static sig *dsa_vrfinit(key *k, void *kd, const gchash *hc) | |
404 | { | |
405 | dh_pub *dp = kd; | |
3688eb75 | 406 | dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime"); |
407 | return (&ds->s); | |
408 | } | |
409 | ||
410 | static sig *bindsa_vrfinit(key *k, void *kd, const gchash *hc) | |
411 | { | |
412 | dh_pub *dp = kd; | |
413 | dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary"); | |
5c3f75ec | 414 | return (&ds->s); |
415 | } | |
416 | ||
417 | static sig *ecdsa_vrfinit(key *k, void *kd, const gchash *hc) | |
418 | { | |
419 | ec_pub *ep = kd; | |
420 | dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc); | |
421 | return (&ds->s); | |
422 | } | |
423 | ||
424 | static int dsa_vrfdoit(sig *s, dstr *d) | |
425 | { | |
426 | dsa_sigctx *ds = (dsa_sigctx *)s; | |
427 | gdsa_sig ss; | |
428 | size_t n = d->len/2; | |
429 | int rc; | |
430 | ||
431 | ss.r = mp_loadb(MP_NEW, d->buf, n); | |
432 | ss.s = mp_loadb(MP_NEW, d->buf + n, d->len - n); | |
433 | rc = gdsa_verify(&ds->g, &ss, GH_DONE(ds->s.h, 0)); | |
434 | mp_drop(ss.r); mp_drop(ss.s); | |
435 | return (rc); | |
436 | } | |
437 | ||
438 | static const sigops dsa_vrf = { | |
439 | dh_pubfetch, sizeof(dh_pub), | |
440 | dsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy | |
441 | }; | |
442 | ||
3688eb75 | 443 | static const sigops bindsa_vrf = { |
444 | dh_pubfetch, sizeof(dh_pub), | |
445 | bindsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy | |
446 | }; | |
447 | ||
5c3f75ec | 448 | static const sigops ecdsa_vrf = { |
449 | ec_pubfetch, sizeof(ec_pub), | |
450 | ecdsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy | |
451 | }; | |
452 | ||
453 | /* --- KCDSA and ECKCDSA --- */ | |
454 | ||
455 | static void kcdsa_privkey(dsa_sigctx *ds, mp *x) | |
456 | { ds->g.u = mp_modinv(MP_NEW, x, ds->g.g->r); } | |
457 | ||
458 | static void kcdsa_sethash(dsa_sigctx *ds, const gchash *hc) | |
459 | { ds->s.h = gkcdsa_beginhash(&ds->g); } | |
460 | ||
461 | static sig *kcdsa_siginit(key *k, void *kd, const gchash *hc) | |
462 | { | |
463 | dh_priv *dp = kd; | |
3688eb75 | 464 | dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime"); |
465 | kcdsa_privkey(ds, dp->x); | |
466 | kcdsa_sethash(ds, hc); | |
467 | return (&ds->s); | |
468 | } | |
469 | ||
470 | static sig *binkcdsa_siginit(key *k, void *kd, const gchash *hc) | |
471 | { | |
472 | dh_priv *dp = kd; | |
473 | dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary"); | |
5c3f75ec | 474 | kcdsa_privkey(ds, dp->x); |
475 | kcdsa_sethash(ds, hc); | |
476 | return (&ds->s); | |
477 | } | |
478 | ||
479 | static sig *eckcdsa_siginit(key *k, void *kd, const gchash *hc) | |
480 | { | |
481 | ec_priv *ep = kd; | |
482 | dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc); | |
483 | kcdsa_privkey(ds, ep->x); | |
484 | kcdsa_sethash(ds, hc); | |
485 | return (&ds->s); | |
486 | } | |
487 | ||
488 | static int kcdsa_sigdoit(sig *s, dstr *d) | |
489 | { | |
490 | dsa_sigctx *ds = (dsa_sigctx *)s; | |
491 | gkcdsa_sig ss = GKCDSA_SIG_INIT; | |
492 | size_t hsz = ds->g.h->hashsz, n = mp_octets(ds->g.g->r); | |
493 | ||
494 | gkcdsa_sign(&ds->g, &ss, GH_DONE(ds->s.h, 0), 0); | |
495 | dstr_ensure(d, hsz + n); | |
496 | memcpy(d->buf, ss.r, hsz); | |
497 | mp_storeb(ss.s, d->buf + hsz, n); | |
498 | d->len += hsz + n; | |
499 | xfree(ss.r); mp_drop(ss.s); | |
500 | return (0); | |
501 | } | |
502 | ||
503 | static const sigops kcdsa_sig = { | |
504 | dh_privfetch, sizeof(dh_priv), | |
505 | kcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy | |
506 | }; | |
507 | ||
3688eb75 | 508 | static const sigops binkcdsa_sig = { |
509 | dh_privfetch, sizeof(dh_priv), | |
510 | binkcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy | |
511 | }; | |
512 | ||
5c3f75ec | 513 | static const sigops eckcdsa_sig = { |
514 | ec_privfetch, sizeof(ec_priv), | |
515 | eckcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy | |
516 | }; | |
517 | ||
518 | static sig *kcdsa_vrfinit(key *k, void *kd, const gchash *hc) | |
519 | { | |
520 | dh_pub *dp = kd; | |
3688eb75 | 521 | dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime"); |
522 | kcdsa_sethash(ds, hc); | |
523 | return (&ds->s); | |
524 | } | |
525 | ||
526 | static sig *binkcdsa_vrfinit(key *k, void *kd, const gchash *hc) | |
527 | { | |
528 | dh_pub *dp = kd; | |
529 | dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary"); | |
5c3f75ec | 530 | kcdsa_sethash(ds, hc); |
531 | return (&ds->s); | |
532 | } | |
533 | ||
534 | static sig *eckcdsa_vrfinit(key *k, void *kd, const gchash *hc) | |
535 | { | |
536 | ec_pub *ep = kd; | |
537 | dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc); | |
538 | kcdsa_sethash(ds, hc); | |
539 | return (&ds->s); | |
540 | } | |
541 | ||
542 | static int kcdsa_vrfdoit(sig *s, dstr *d) | |
543 | { | |
544 | dsa_sigctx *ds = (dsa_sigctx *)s; | |
545 | gkcdsa_sig ss; | |
546 | size_t hsz = ds->g.h->hashsz, n = d->len - hsz; | |
547 | int rc; | |
548 | ||
549 | if (d->len < hsz) | |
550 | return (-1); | |
551 | ss.r = (octet *)d->buf; | |
552 | ss.s = mp_loadb(MP_NEW, d->buf + hsz, n); | |
553 | rc = gkcdsa_verify(&ds->g, &ss, GH_DONE(ds->s.h, 0)); | |
554 | mp_drop(ss.s); | |
555 | return (rc); | |
556 | } | |
557 | ||
558 | static const sigops kcdsa_vrf = { | |
559 | dh_pubfetch, sizeof(dh_pub), | |
560 | kcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy | |
561 | }; | |
562 | ||
3688eb75 | 563 | static const sigops binkcdsa_vrf = { |
564 | dh_pubfetch, sizeof(dh_pub), | |
565 | binkcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy | |
566 | }; | |
567 | ||
5c3f75ec | 568 | static const sigops eckcdsa_vrf = { |
569 | ec_pubfetch, sizeof(ec_pub), | |
570 | eckcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy | |
571 | }; | |
572 | ||
02dfbd5b MW |
573 | /* --- Symmetric message authentication --- */ |
574 | ||
575 | typedef struct mac_ctx { | |
576 | sig s; | |
577 | const gcmac *mc; | |
578 | gmac *m; | |
579 | key_packdef kp; | |
580 | key_bin kb; | |
581 | } mac_ctx; | |
582 | ||
583 | static sig *mac_init(key *k, void *kd, const gchash *hc) | |
584 | { | |
585 | mac_ctx *m; | |
586 | dstr d = DSTR_INIT; | |
587 | int err; | |
588 | const char *mm; | |
589 | ||
590 | m = CREATE(mac_ctx); | |
591 | ||
592 | key_fulltag(k, &d); | |
593 | m->kp.e = KENC_BINARY; | |
594 | m->kp.p = &m->kb; | |
595 | m->kp.kd = 0; | |
596 | ||
597 | if ((mm = key_getattr(0 /*yik*/, k, "mac")) == 0) { | |
598 | dstr_putf(&d, "%s-hmac", hc->name); | |
599 | mm = d.buf; | |
600 | } | |
601 | if ((m->mc = gmac_byname(mm)) == 0) | |
602 | die(EXIT_FAILURE, "unknown message authentication scheme `%s'", mm); | |
603 | dstr_reset(&d); | |
604 | ||
605 | if ((err = key_unpack(&m->kp, kd, &d)) != 0) { | |
606 | die(EXIT_FAILURE, "failed to unpack symmetric key `%s': %s", | |
607 | d.buf, key_strerror(err)); | |
608 | } | |
609 | dstr_destroy(&d); | |
610 | ||
611 | if (keysz(m->kb.sz, m->mc->keysz) != m->kb.sz) { | |
612 | die(EXIT_FAILURE, "bad key size %lu for `%s'", | |
613 | (unsigned long)m->kb.sz, m->mc->name); | |
614 | } | |
615 | m->m = GM_KEY(m->mc, m->kb.k, m->kb.sz); | |
616 | m->s.h = GM_INIT(m->m); | |
617 | return (&m->s); | |
618 | } | |
619 | ||
620 | static int mac_sigdoit(sig *s, dstr *d) | |
621 | { | |
622 | mac_ctx *m = (mac_ctx *)s; | |
623 | ||
624 | dstr_ensure(d, m->mc->hashsz); | |
625 | GH_DONE(m->s.h, d->buf); | |
626 | d->len += m->mc->hashsz; | |
627 | return (0); | |
628 | } | |
629 | ||
630 | static int mac_vrfdoit(sig *s, dstr *d) | |
631 | { | |
632 | mac_ctx *m = (mac_ctx *)s; | |
633 | const octet *t; | |
634 | ||
635 | t = GH_DONE(m->s.h, 0); | |
636 | if (d->len != m->mc->hashsz || memcmp(d->buf, t, d->len) != 0) | |
637 | return (-1); | |
638 | return (0); | |
639 | } | |
640 | ||
641 | static const char *mac_check(sig *s) { return (0); } | |
642 | ||
643 | static void mac_destroy(sig *s) | |
644 | { | |
645 | mac_ctx *m = (mac_ctx *)s; | |
646 | GM_DESTROY(m->m); | |
647 | key_unpackdone(&m->kp); | |
648 | } | |
649 | ||
650 | static const sigops mac_sig = { | |
651 | 0, 0, | |
652 | mac_init, mac_sigdoit, mac_check, mac_destroy | |
653 | }; | |
654 | ||
655 | static const sigops mac_vrf = { | |
656 | 0, 0, | |
657 | mac_init, mac_vrfdoit, mac_check, mac_destroy | |
658 | }; | |
659 | ||
5c3f75ec | 660 | /* --- The switch table --- */ |
661 | ||
c65df279 | 662 | const struct sigtab sigtab[] = { |
5c3f75ec | 663 | { "rsapkcs1", &rsap1_sig, &rsap1_vrf, &sha }, |
664 | { "rsapss", &rsapss_sig, &rsapss_vrf, &sha }, | |
665 | { "dsa", &dsa_sig, &dsa_vrf, &sha }, | |
3688eb75 | 666 | { "bindsa", &bindsa_sig, &bindsa_vrf, &sha }, |
5c3f75ec | 667 | { "ecdsa", &ecdsa_sig, &ecdsa_vrf, &sha }, |
668 | { "kcdsa", &kcdsa_sig, &kcdsa_vrf, &has160 }, | |
3688eb75 | 669 | { "binkcdsa", &binkcdsa_sig, &binkcdsa_vrf, &has160 }, |
5c3f75ec | 670 | { "eckcdsa", &eckcdsa_sig, &eckcdsa_vrf, &has160 }, |
02dfbd5b | 671 | { "mac", &mac_sig, &mac_vrf, &rmd160 }, |
5c3f75ec | 672 | { 0, 0, 0 } |
673 | }; | |
674 | ||
675 | /* --- @getsig@ --- * | |
676 | * | |
677 | * Arguments: @key *k@ = the key to load | |
678 | * @const char *app@ = application name | |
679 | * @int wantpriv@ = nonzero if we want to sign | |
680 | * | |
681 | * Returns: A signature-making thing. | |
682 | * | |
683 | * Use: Loads a key and starts hashing. | |
684 | */ | |
685 | ||
686 | sig *getsig(key *k, const char *app, int wantpriv) | |
687 | { | |
688 | const char *salg, *halg = 0; | |
689 | dstr d = DSTR_INIT; | |
690 | dstr t = DSTR_INIT; | |
691 | char *p = 0; | |
692 | const char *q; | |
693 | sig *s; | |
694 | size_t n; | |
695 | const struct sigtab *st; | |
696 | const sigops *so; | |
697 | const gchash *ch; | |
698 | void *kd; | |
699 | int e; | |
700 | key_packdef *kp; | |
701 | ||
702 | /* --- Setup stuff --- */ | |
703 | ||
704 | key_fulltag(k, &t); | |
705 | ||
706 | /* --- Get the signature algorithm --- * | |
707 | * | |
708 | * Take the attribute if it's there; otherwise use the key type. | |
709 | */ | |
710 | ||
711 | n = strlen(app); | |
712 | if ((q = key_getattr(0, k, "sig")) != 0) { | |
713 | dstr_puts(&d, q); | |
714 | p = d.buf; | |
715 | } else if (strncmp(k->type, app, n) == 0 && k->type[n] == '-') { | |
716 | dstr_puts(&d, k->type); | |
717 | p = d.buf + n + 1; | |
718 | } else | |
719 | die(EXIT_FAILURE, "no signature algorithm for key `%s'", t.buf); | |
720 | ||
721 | /* --- Grab the hash algorithm --- * | |
722 | * | |
723 | * Grab it from the signature algorithm if it's there. But override that | |
724 | * from the attribute. | |
725 | */ | |
726 | ||
727 | salg = p; | |
728 | if ((p = strchr(p, '/')) != 0) { | |
729 | *p++ = 0; | |
730 | halg = p; | |
731 | } | |
732 | if ((q = key_getattr(0, k, "hash")) != 0) | |
733 | halg = q; | |
734 | ||
735 | /* --- Look up the algorithms in the table --- */ | |
736 | ||
737 | for (st = sigtab; st->name; st++) { | |
738 | if (strcmp(st->name, salg) == 0) | |
739 | goto s_found; | |
740 | } | |
741 | die(EXIT_FAILURE, "signature algorithm `%s' not found in key `%s'", | |
742 | salg, t.buf); | |
743 | s_found:; | |
744 | if (!halg) | |
745 | ch = st->ch; | |
746 | else { | |
747 | if ((ch = ghash_byname(halg)) == 0) { | |
748 | die(EXIT_FAILURE, "hash algorithm `%s' not found in key `%s'", | |
749 | halg, t.buf); | |
750 | } | |
751 | } | |
752 | so = wantpriv ? st->signops : st->verifyops; | |
753 | ||
754 | /* --- Load the key --- */ | |
755 | ||
02dfbd5b MW |
756 | if (!so->kf) { |
757 | kd = k->k; | |
758 | key_incref(kd); | |
78ec50fa | 759 | kp = 0; |
02dfbd5b MW |
760 | } else { |
761 | kd = xmalloc(so->kdsz); | |
762 | kp = key_fetchinit(so->kf, 0, kd); | |
763 | if ((e = key_fetch(kp, k)) != 0) { | |
764 | die(EXIT_FAILURE, "error fetching key `%s': %s", | |
765 | t.buf, key_strerror(e)); | |
766 | } | |
767 | } | |
5c3f75ec | 768 | s = so->init(k, kd, ch); |
769 | if (!s->h) | |
770 | s->h = GH_INIT(ch); | |
771 | s->kp = kp; | |
772 | s->ops = so; | |
773 | s->kd = kd; | |
02dfbd5b | 774 | s->ch = ch; |
5c3f75ec | 775 | |
776 | /* --- Free stuff up --- */ | |
777 | ||
778 | dstr_destroy(&d); | |
779 | dstr_destroy(&t); | |
780 | return (s); | |
781 | } | |
782 | ||
783 | /* --- @freesig@ --- * | |
784 | * | |
785 | * Arguments: @sig *s@ = signature-making thing | |
786 | * | |
787 | * Returns: --- | |
788 | * | |
789 | * Use: Frees up a signature-making thing | |
790 | */ | |
791 | ||
792 | void freesig(sig *s) | |
793 | { | |
794 | GH_DESTROY(s->h); | |
02dfbd5b MW |
795 | if (!s->ops->kf) |
796 | key_drop(s->kd); | |
45c0fd36 | 797 | else { |
02dfbd5b MW |
798 | key_fetchdone(s->kp); |
799 | xfree(s->kd); | |
800 | } | |
5c3f75ec | 801 | s->ops->destroy(s); |
802 | } | |
803 | ||
804 | /*----- That's all, folks -------------------------------------------------*/ |