Commit | Line | Data |
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5c3f75ec | 1 | /* -*-c-*- |
2 | * | |
5c3f75ec | 3 | * Catcrypt key-encapsulation |
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/alloc.h> | |
35 | #include <mLib/dstr.h> | |
36 | #include <mLib/report.h> | |
37 | #include <mLib/sub.h> | |
38 | ||
11ee758a | 39 | #include "gaead.h" |
5c3f75ec | 40 | #include "mprand.h" |
41 | #include "rand.h" | |
42 | ||
43 | #include "ec.h" | |
44 | #include "ec-keys.h" | |
45 | #include "dh.h" | |
46 | #include "rsa.h" | |
fc2d44af | 47 | #include "x25519.h" |
643eb1bb | 48 | #include "x448.h" |
5c3f75ec | 49 | |
50 | #include "rmd160.h" | |
51 | #include "blowfish-cbc.h" | |
11ee758a | 52 | #include "chacha20-poly1305.h" |
d9d419b0 MW |
53 | #include "poly1305.h" |
54 | #include "salsa20.h" | |
55 | #include "chacha.h" | |
5c3f75ec | 56 | |
57 | #include "cc.h" | |
58 | ||
66ff643c MW |
59 | /*----- Bulk crypto -------------------------------------------------------*/ |
60 | ||
d9d419b0 MW |
61 | /* --- NaCl `secretbox' --- */ |
62 | ||
63 | typedef struct naclbox_encctx { | |
64 | bulk b; | |
65 | const gccipher *cc; | |
66 | gcipher *c; | |
67 | } naclbox_encctx; | |
68 | ||
69 | static bulk *naclbox_init(key *k, const char *calg, const char *halg) | |
70 | { | |
71 | naclbox_encctx *ctx = CREATE(naclbox_encctx); | |
72 | dstr t = DSTR_INIT; | |
73 | const char *q; | |
74 | ||
75 | key_fulltag(k, &t); | |
76 | ||
77 | if ((q = key_getattr(0, k, "cipher")) != 0) calg = q; | |
78 | if (!calg || strcmp(calg, "salsa20") == 0) ctx->cc = &salsa20; | |
79 | else if (strcmp(calg, "salsa20/12") == 0) ctx->cc = &salsa2012; | |
80 | else if (strcmp(calg, "salsa20/8") == 0) ctx->cc = &salsa208; | |
81 | else if (strcmp(calg, "chacha20") == 0) ctx->cc = &chacha20; | |
82 | else if (strcmp(calg, "chacha12") == 0) ctx->cc = &chacha12; | |
83 | else if (strcmp(calg, "chacha8") == 0) ctx->cc = &chacha8; | |
84 | else { | |
85 | die(EXIT_FAILURE, | |
86 | "unknown or inappropriate encryption scheme `%s' in key `%s'", | |
87 | calg, t.buf); | |
88 | } | |
89 | ||
90 | dstr_destroy(&t); | |
91 | return (&ctx->b); | |
92 | } | |
93 | ||
94 | static int naclbox_setup(bulk *b, gcipher *cx) | |
95 | { | |
96 | naclbox_encctx *ctx = (naclbox_encctx *)b; | |
97 | octet k[SALSA20_KEYSZ]; | |
98 | ||
99 | GC_ENCRYPT(cx, 0, k, sizeof(k)); | |
100 | ctx->c = GC_INIT(ctx->cc, k, sizeof(k)); | |
101 | return (0); | |
102 | } | |
103 | ||
104 | static size_t naclbox_overhead(bulk *b) { return (POLY1305_TAGSZ); } | |
105 | ||
106 | static void naclbox_destroy(bulk *b) | |
107 | { | |
108 | naclbox_encctx *ctx = (naclbox_encctx *)b; | |
109 | ||
110 | GC_DESTROY(ctx->c); | |
111 | DESTROY(ctx); | |
112 | } | |
113 | ||
114 | static const char *naclbox_encdoit(bulk *b, uint32 seq, buf *bb, | |
115 | const void *p, size_t sz) | |
116 | { | |
117 | naclbox_encctx *ctx = (naclbox_encctx *)b; | |
118 | octet t[32]; | |
119 | poly1305_key ak; | |
120 | poly1305_ctx a; | |
121 | octet *tag, *ct; | |
122 | ||
123 | STORE32(t, seq); STORE32(t + 4, 0); GC_SETIV(ctx->c, t); | |
124 | GC_ENCRYPT(ctx->c, 0, t, POLY1305_KEYSZ + POLY1305_MASKSZ); | |
125 | poly1305_keyinit(&ak, t, POLY1305_KEYSZ); | |
126 | poly1305_macinit(&a, &ak, t + POLY1305_KEYSZ); | |
127 | ||
128 | tag = buf_get(bb, POLY1305_TAGSZ); assert(tag); | |
129 | ct = buf_get(bb, sz); assert(ct); | |
130 | GC_ENCRYPT(ctx->c, p, ct, sz); | |
131 | poly1305_hash(&a, ct, sz); | |
132 | poly1305_done(&a, tag); | |
133 | return (0); | |
134 | } | |
135 | ||
136 | static const char *naclbox_decdoit(bulk *b, uint32 seq, buf *bb, | |
137 | const void *p, size_t sz) | |
138 | { | |
139 | naclbox_encctx *ctx = (naclbox_encctx *)b; | |
140 | buf bin; | |
141 | octet t[32]; | |
142 | poly1305_key ak; | |
143 | poly1305_ctx a; | |
144 | octet *tag, *ct, *pt; | |
145 | ||
146 | STORE32(t, seq); STORE32(t + 4, 0); GC_SETIV(ctx->c, t); | |
147 | GC_ENCRYPT(ctx->c, 0, t, POLY1305_KEYSZ + POLY1305_MASKSZ); | |
148 | poly1305_keyinit(&ak, t, POLY1305_KEYSZ); | |
149 | poly1305_macinit(&a, &ak, t + POLY1305_KEYSZ); | |
150 | ||
151 | buf_init(&bin, (/*unconst*/ void *)p, sz); | |
152 | if ((tag = buf_get(&bin, POLY1305_TAGSZ)) == 0) return ("no tag"); | |
153 | ct = BCUR(&bin); sz = BLEFT(&bin); | |
154 | poly1305_hash(&a, ct, sz); | |
155 | poly1305_done(&a, t); | |
156 | if (!ct_memeq(t, tag, POLY1305_TAGSZ)) return ("authentication failure"); | |
157 | pt = buf_get(bb, sz); assert(pt); | |
158 | GC_DECRYPT(ctx->c, ct, pt, sz); | |
159 | return (0); | |
160 | } | |
161 | ||
162 | static const bulkops naclbox_encops = { | |
163 | naclbox_init, naclbox_setup, naclbox_overhead, | |
164 | naclbox_encdoit, naclbox_destroy | |
165 | }, naclbox_decops = { | |
166 | naclbox_init, naclbox_setup, naclbox_overhead, | |
167 | naclbox_decdoit, naclbox_destroy | |
168 | }; | |
169 | ||
11ee758a MW |
170 | /* --- Authenticated encryption schemes --- */ |
171 | ||
172 | typedef struct aead_encctx { | |
173 | bulk b; | |
174 | const gcaead *aec; | |
175 | gaead_key *key; | |
176 | union { gaead_enc *enc; gaead_dec *dec; } ed; | |
177 | octet *t; | |
178 | size_t nsz, tsz; | |
179 | } aead_encctx; | |
180 | ||
181 | static bulk *aead_init(key *k, const char *calg, const char *halg) | |
182 | { | |
183 | aead_encctx *ctx = CREATE(aead_encctx); | |
184 | const char *q; | |
185 | dstr t = DSTR_INIT; | |
186 | ||
187 | key_fulltag(k, &t); | |
188 | ||
189 | if ((q = key_getattr(0, k, "cipher")) != 0) calg = q; | |
190 | if (!calg) ctx->aec = &chacha20_poly1305; | |
191 | else if ((ctx->aec = gaead_byname(calg)) == 0) | |
192 | die(EXIT_FAILURE, "AEAD scheme `%s' not found in key `%s'", | |
193 | calg, t.buf); | |
194 | ||
195 | ctx->key = 0; | |
196 | if ((ctx->nsz = keysz_pad(4, ctx->aec->noncesz)) == 0) | |
197 | die(EXIT_FAILURE, "no suitable nonce size for `%s'", calg); | |
198 | ctx->tsz = keysz(0, ctx->aec->tagsz); | |
199 | ||
200 | dstr_destroy(&t); | |
201 | return (&ctx->b); | |
202 | } | |
203 | ||
204 | static int aead_commonsetup(aead_encctx *ctx, gcipher *cx) | |
205 | { | |
206 | size_t ksz, n; | |
207 | ||
208 | n = ksz = keysz(0, ctx->aec->keysz); | |
209 | if (n < ctx->nsz) n = ctx->nsz; | |
210 | if (n < ctx->tsz) n = ctx->tsz; | |
211 | ctx->t = xmalloc(n); | |
212 | ||
213 | GC_ENCRYPT(cx, 0, ctx->t, ksz); | |
214 | ctx->key = GAEAD_KEY(ctx->aec, ctx->t, ksz); | |
215 | return (0); | |
216 | } | |
217 | ||
218 | static size_t aead_overhead(bulk *b) | |
219 | { aead_encctx *ctx = (aead_encctx *)b; return (ctx->aec->ohd + ctx->tsz); } | |
220 | ||
221 | static void aead_commondestroy(aead_encctx *ctx) | |
222 | { | |
223 | if (ctx->key) GAEAD_DESTROY(ctx->key); | |
224 | xfree(ctx->t); | |
225 | DESTROY(ctx); | |
226 | } | |
227 | ||
228 | static int aead_encsetup(bulk *b, gcipher *cx) | |
229 | { | |
230 | aead_encctx *ctx = (aead_encctx *)b; | |
231 | ctx->ed.enc = 0; return (aead_commonsetup(ctx, cx)); | |
232 | } | |
233 | ||
234 | static const char *aead_encdoit(bulk *b, uint32 seq, buf *bb, | |
235 | const void *p, size_t sz) | |
236 | { | |
237 | aead_encctx *ctx = (aead_encctx *)b; | |
238 | octet *t; | |
239 | int rc; | |
240 | ||
241 | memset(ctx->t + 4, 0, ctx->nsz - 4); STORE32_B(ctx->t, seq); | |
242 | if (!ctx->ed.enc) | |
243 | ctx->ed.enc = GAEAD_ENC(ctx->key, ctx->t, ctx->nsz, 0, sz, ctx->tsz); | |
244 | else | |
245 | GAEAD_REINIT(ctx->ed.enc, ctx->t, ctx->nsz, 0, sz, ctx->tsz); | |
246 | t = buf_get(bb, ctx->tsz); assert(t); | |
247 | rc = GAEAD_ENCRYPT(ctx->ed.enc, p, sz, bb); assert(rc >= 0); | |
248 | rc = GAEAD_DONE(ctx->ed.enc, 0, bb, t, ctx->tsz); assert(rc >= 0); | |
249 | return (0); | |
250 | } | |
251 | ||
252 | static void aead_encdestroy(bulk *b) | |
253 | { | |
254 | aead_encctx *ctx = (aead_encctx *)b; | |
255 | if (ctx->ed.enc) GAEAD_DESTROY(ctx->ed.enc); | |
256 | aead_commondestroy(ctx); | |
257 | } | |
258 | ||
259 | static int aead_decsetup(bulk *b, gcipher *cx) | |
260 | { | |
261 | aead_encctx *ctx = (aead_encctx *)b; | |
262 | ctx->ed.dec = 0; return (aead_commonsetup(ctx, cx)); | |
263 | } | |
264 | ||
265 | static const char *aead_decdoit(bulk *b, uint32 seq, buf *bb, | |
266 | const void *p, size_t sz) | |
267 | { | |
268 | aead_encctx *ctx = (aead_encctx *)b; | |
269 | buf bin; | |
270 | const octet *t; | |
271 | int rc; | |
272 | ||
273 | memset(ctx->t + 4, 0, ctx->nsz - 4); STORE32_B(ctx->t, seq); | |
274 | if (!ctx->ed.dec) | |
275 | ctx->ed.dec = GAEAD_DEC(ctx->key, ctx->t, ctx->nsz, 0, sz, ctx->tsz); | |
276 | else | |
277 | GAEAD_REINIT(ctx->ed.enc, ctx->t, ctx->nsz, 0, sz, ctx->tsz); | |
278 | ||
279 | buf_init(&bin, (/*unconst*/ void *)p, sz); | |
280 | t = buf_get(&bin, ctx->tsz); if (!t) return ("no tag"); | |
281 | rc = GAEAD_DECRYPT(ctx->ed.dec, BCUR(&bin), BLEFT(&bin), bb); | |
282 | assert(rc >= 0); | |
283 | rc = GAEAD_DONE(ctx->ed.dec, 0, bb, t, ctx->tsz); assert(rc >= 0); | |
284 | if (!rc) return ("authentication failure"); | |
285 | return (0); | |
286 | } | |
287 | ||
288 | static void aead_decdestroy(bulk *b) | |
289 | { | |
290 | aead_encctx *ctx = (aead_encctx *)b; | |
291 | if (ctx->ed.dec) GAEAD_DESTROY(ctx->ed.dec); | |
292 | aead_commondestroy(ctx); | |
293 | } | |
294 | ||
295 | static const struct bulkops aead_encops = { | |
296 | aead_init, aead_encsetup, aead_overhead, | |
297 | aead_encdoit, aead_encdestroy | |
298 | }, aead_decops = { | |
299 | aead_init, aead_decsetup, aead_overhead, | |
300 | aead_decdoit, aead_decdestroy | |
301 | }; | |
302 | ||
66ff643c MW |
303 | /* --- Generic composition --- */ |
304 | ||
305 | typedef struct gencomp_encctx { | |
306 | bulk b; | |
307 | const gccipher *cc; | |
308 | const gcmac *mc; | |
309 | gcipher *c, *cx; | |
310 | gmac *m; | |
311 | octet *t; size_t tsz; | |
312 | } gencomp_encctx; | |
313 | ||
314 | static bulk *gencomp_init(key *k, const char *calg, const char *halg) | |
315 | { | |
316 | gencomp_encctx *ctx = CREATE(gencomp_encctx); | |
317 | const char *q; | |
318 | dstr d = DSTR_INIT, t = DSTR_INIT; | |
319 | ||
320 | key_fulltag(k, &t); | |
321 | ||
322 | if ((q = key_getattr(0, k, "cipher")) != 0) calg = q; | |
323 | if (!calg) ctx->cc = &blowfish_cbc; | |
324 | else if ((ctx->cc = gcipher_byname(calg)) == 0) { | |
325 | die(EXIT_FAILURE, "encryption scheme `%s' not found in key `%s'", | |
326 | calg, t.buf); | |
327 | } | |
328 | ||
329 | dstr_reset(&d); | |
330 | if ((q = key_getattr(0, k, "mac")) == 0) { | |
331 | dstr_putf(&d, "%s-hmac", halg); | |
332 | q = d.buf; | |
333 | } | |
334 | if ((ctx->mc = gmac_byname(q)) == 0) { | |
335 | die(EXIT_FAILURE, | |
336 | "message authentication code `%s' not found in key `%s'", | |
337 | q, t.buf); | |
338 | } | |
339 | ||
340 | return (&ctx->b); | |
341 | } | |
342 | ||
343 | static int gencomp_setup(bulk *b, gcipher *cx) | |
344 | { | |
345 | gencomp_encctx *ctx = (gencomp_encctx *)b; | |
346 | size_t cn, mn, n; | |
347 | octet *kd; | |
348 | ||
349 | ctx->cx = cx; | |
350 | n = ctx->cc->blksz; | |
351 | cn = keysz(0, ctx->cc->keysz); if (cn > n) n = cn; | |
352 | mn = keysz(0, ctx->mc->keysz); if (mn > n) n = mn; | |
353 | ctx->t = kd = xmalloc(n); ctx->tsz = n; | |
354 | GC_ENCRYPT(cx, 0, kd, cn); | |
355 | ctx->c = GC_INIT(ctx->cc, kd, cn); | |
356 | GC_ENCRYPT(cx, 0, kd, mn); | |
357 | ctx->m = GM_KEY(ctx->mc, kd, mn); | |
358 | return (0); | |
359 | } | |
360 | ||
361 | static size_t gencomp_overhead(bulk *b) | |
362 | { | |
363 | gencomp_encctx *ctx = (gencomp_encctx *)b; | |
364 | return (ctx->cc->blksz + ctx->mc->hashsz); } | |
365 | ||
366 | static void gencomp_destroy(bulk *b) | |
367 | { | |
368 | gencomp_encctx *ctx = (gencomp_encctx *)b; | |
369 | ||
370 | GC_DESTROY(ctx->c); | |
371 | GC_DESTROY(ctx->m); | |
372 | xfree(ctx->t); | |
373 | DESTROY(ctx); | |
374 | } | |
375 | ||
376 | static const char *gencomp_encdoit(bulk *b, uint32 seq, buf *bb, | |
377 | const void *p, size_t sz) | |
378 | { | |
379 | gencomp_encctx *ctx = (gencomp_encctx *)b; | |
380 | octet *tag, *ct; | |
381 | ghash *h = GM_INIT(ctx->m); | |
382 | ||
383 | GH_HASHU32(h, seq); | |
384 | if (ctx->cc->blksz) { | |
385 | GC_ENCRYPT(ctx->cx, 0, ctx->t, ctx->cc->blksz); | |
386 | GC_SETIV(ctx->c, ctx->t); | |
387 | } | |
388 | tag = buf_get(bb, ctx->mc->hashsz); assert(tag); | |
389 | ct = buf_get(bb, sz); assert(ct); | |
390 | GC_ENCRYPT(ctx->c, p, ct, sz); | |
391 | GH_HASH(h, ct, sz); | |
392 | GH_DONE(h, tag); | |
393 | GH_DESTROY(h); | |
394 | return (0); | |
395 | } | |
396 | ||
397 | static const char *gencomp_decdoit(bulk *b, uint32 seq, buf *bb, | |
398 | const void *p, size_t sz) | |
399 | { | |
400 | gencomp_encctx *ctx = (gencomp_encctx *)b; | |
401 | buf bin; | |
402 | const octet *tag, *ct; | |
403 | octet *pt; | |
404 | ghash *h; | |
405 | int ok; | |
406 | ||
407 | buf_init(&bin, (/*unconst*/ void *)p, sz); | |
408 | if ((tag = buf_get(&bin, ctx->mc->hashsz)) == 0) return ("no tag"); | |
409 | ct = BCUR(&bin); sz = BLEFT(&bin); | |
410 | pt = buf_get(bb, sz); assert(pt); | |
411 | ||
412 | h = GM_INIT(ctx->m); | |
413 | GH_HASHU32(h, seq); | |
414 | GH_HASH(h, ct, sz); | |
415 | ok = ct_memeq(tag, GH_DONE(h, 0), ctx->mc->hashsz); | |
416 | GH_DESTROY(h); | |
417 | if (!ok) return ("authentication failure"); | |
418 | ||
419 | if (ctx->cc->blksz) { | |
420 | GC_ENCRYPT(ctx->cx, 0, ctx->t, ctx->cc->blksz); | |
421 | GC_SETIV(ctx->c, ctx->t); | |
422 | } | |
423 | GC_DECRYPT(ctx->c, ct, pt, sz); | |
424 | return (0); | |
425 | } | |
426 | ||
427 | static const bulkops gencomp_encops = { | |
428 | gencomp_init, gencomp_setup, gencomp_overhead, | |
429 | gencomp_encdoit, gencomp_destroy | |
430 | }, gencomp_decops = { | |
431 | gencomp_init, gencomp_setup, gencomp_overhead, | |
432 | gencomp_decdoit, gencomp_destroy | |
433 | }; | |
434 | ||
435 | const struct bulktab bulktab[] = { | |
436 | { "gencomp", &gencomp_encops, &gencomp_decops }, | |
d9d419b0 | 437 | { "naclbox", &naclbox_encops, &naclbox_decops }, |
11ee758a | 438 | { "aead", &aead_encops, &aead_decops }, |
66ff643c MW |
439 | { 0, 0, 0 } |
440 | }; | |
441 | ||
5c3f75ec | 442 | /*----- Key encapsulation -------------------------------------------------*/ |
443 | ||
444 | /* --- RSA --- */ | |
445 | ||
446 | typedef struct rsa_encctx { | |
447 | kem k; | |
448 | rsa_pubctx rp; | |
449 | } rsa_encctx; | |
450 | ||
451 | static kem *rsa_encinit(key *k, void *kd) | |
452 | { | |
453 | rsa_encctx *re = CREATE(rsa_encctx); | |
454 | rsa_pubcreate(&re->rp, kd); | |
455 | return (&re->k); | |
456 | } | |
457 | ||
458 | static int rsa_encdoit(kem *k, dstr *d, ghash *h) | |
459 | { | |
460 | rsa_encctx *re = (rsa_encctx *)k; | |
461 | mp *x = mprand_range(MP_NEW, re->rp.rp->n, &rand_global, 0); | |
462 | mp *y = rsa_pubop(&re->rp, MP_NEW, x); | |
463 | size_t n = mp_octets(re->rp.rp->n); | |
464 | dstr_ensure(d, n); | |
465 | mp_storeb(x, d->buf, n); | |
466 | GH_HASH(h, d->buf, n); | |
467 | mp_storeb(y, d->buf, n); | |
468 | d->len += n; | |
469 | mp_drop(x); | |
470 | mp_drop(y); | |
471 | return (0); | |
472 | } | |
473 | ||
474 | static const char *rsa_lengthcheck(mp *n) | |
475 | { | |
476 | if (mp_bits(n) < 1020) return ("key too short"); | |
477 | return (0); | |
478 | } | |
479 | ||
480 | static const char *rsa_enccheck(kem *k) | |
481 | { | |
482 | rsa_encctx *re = (rsa_encctx *)k; | |
483 | const char *e; | |
484 | if ((e = rsa_lengthcheck(re->rp.rp->n)) != 0) return (e); | |
485 | return (0); | |
486 | } | |
487 | ||
488 | static void rsa_encdestroy(kem *k) | |
489 | { | |
490 | rsa_encctx *re = (rsa_encctx *)k; | |
491 | rsa_pubdestroy(&re->rp); | |
492 | DESTROY(re); | |
493 | } | |
494 | ||
495 | static const kemops rsa_encops = { | |
496 | rsa_pubfetch, sizeof(rsa_pub), | |
497 | rsa_encinit, rsa_encdoit, rsa_enccheck, rsa_encdestroy | |
498 | }; | |
499 | ||
500 | typedef struct rsa_decctx { | |
501 | kem k; | |
502 | rsa_privctx rp; | |
503 | } rsa_decctx; | |
504 | ||
505 | static kem *rsa_decinit(key *k, void *kd) | |
506 | { | |
507 | rsa_decctx *rd = CREATE(rsa_decctx); | |
508 | rsa_privcreate(&rd->rp, kd, &rand_global); | |
509 | return (&rd->k); | |
510 | } | |
511 | ||
512 | static int rsa_decdoit(kem *k, dstr *d, ghash *h) | |
513 | { | |
514 | rsa_decctx *rd = (rsa_decctx *)k; | |
515 | mp *x = mp_loadb(MP_NEW, d->buf, d->len); | |
516 | size_t n; | |
517 | char *p; | |
518 | ||
519 | if (MP_CMP(x, >=, rd->rp.rp->n)) { | |
520 | mp_drop(x); | |
521 | return (-1); | |
522 | } | |
523 | n = mp_octets(rd->rp.rp->n); | |
524 | p = xmalloc(n); | |
525 | x = rsa_privop(&rd->rp, x, x); | |
526 | mp_storeb(x, p, n); | |
527 | GH_HASH(h, p, n); | |
528 | mp_drop(x); | |
529 | xfree(p); | |
530 | return (0); | |
531 | } | |
532 | ||
533 | static const char *rsa_deccheck(kem *k) | |
534 | { | |
535 | rsa_decctx *rd = (rsa_decctx *)k; | |
536 | const char *e; | |
537 | if ((e = rsa_lengthcheck(rd->rp.rp->n)) != 0) return (e); | |
538 | return (0); | |
539 | } | |
540 | ||
541 | static void rsa_decdestroy(kem *k) | |
542 | { | |
543 | rsa_decctx *rd = (rsa_decctx *)k; | |
544 | rsa_privdestroy(&rd->rp); | |
545 | DESTROY(rd); | |
546 | } | |
547 | ||
548 | static const kemops rsa_decops = { | |
549 | rsa_privfetch, sizeof(rsa_priv), | |
550 | rsa_decinit, rsa_decdoit, rsa_deccheck, rsa_decdestroy | |
551 | }; | |
552 | ||
553 | /* --- DH and EC --- */ | |
554 | ||
555 | typedef struct dh_encctx { | |
556 | kem k; | |
557 | group *g; | |
558 | mp *x; | |
559 | ge *y; | |
560 | } dh_encctx; | |
561 | ||
45c0fd36 | 562 | static dh_encctx *dh_doinit(key *k, const gprime_param *gp, mp *y, |
3688eb75 | 563 | group *(*makegroup)(const gprime_param *), |
564 | const char *what) | |
5c3f75ec | 565 | { |
566 | dh_encctx *de = CREATE(dh_encctx); | |
567 | dstr t = DSTR_INIT; | |
568 | ||
569 | key_fulltag(k, &t); | |
3688eb75 | 570 | if ((de->g = makegroup(gp)) == 0) |
571 | die(EXIT_FAILURE, "bad %s group in key `%s'", what, t.buf); | |
5c3f75ec | 572 | de->x = MP_NEW; |
573 | de->y = G_CREATE(de->g); | |
574 | if (G_FROMINT(de->g, de->y, y)) | |
575 | die(EXIT_FAILURE, "bad public key `%s'", t.buf); | |
576 | dstr_destroy(&t); | |
577 | return (de); | |
578 | } | |
579 | ||
580 | static dh_encctx *ec_doinit(key *k, const char *cstr, const ec *y) | |
581 | { | |
582 | dh_encctx *de = CREATE(dh_encctx); | |
583 | ec_info ei; | |
584 | const char *e; | |
585 | dstr t = DSTR_INIT; | |
586 | ||
587 | key_fulltag(k, &t); | |
588 | if ((e = ec_getinfo(&ei, cstr)) != 0 || | |
589 | (de->g = group_ec(&ei)) == 0) | |
590 | die(EXIT_FAILURE, "bad elliptic curve spec in key `%s': %s", t.buf, e); | |
591 | de->x = MP_NEW; | |
592 | de->y = G_CREATE(de->g); | |
593 | if (G_FROMEC(de->g, de->y, y)) | |
594 | die(EXIT_FAILURE, "bad public curve point `%s'", t.buf); | |
595 | dstr_destroy(&t); | |
596 | return (de); | |
597 | } | |
598 | ||
599 | static kem *dh_encinit(key *k, void *kd) | |
600 | { | |
601 | dh_pub *dp = kd; | |
3688eb75 | 602 | dh_encctx *de = dh_doinit(k, &dp->dp, dp->y, group_prime, "prime"); |
603 | return (&de->k); | |
604 | } | |
605 | ||
606 | static kem *bindh_encinit(key *k, void *kd) | |
607 | { | |
608 | dh_pub *dp = kd; | |
609 | dh_encctx *de = dh_doinit(k, &dp->dp, dp->y, group_binary, "binary"); | |
5c3f75ec | 610 | return (&de->k); |
611 | } | |
612 | ||
613 | static kem *ec_encinit(key *k, void *kd) | |
614 | { | |
615 | ec_pub *ep = kd; | |
616 | dh_encctx *de = ec_doinit(k, ep->cstr, &ep->p); | |
617 | return (&de->k); | |
618 | } | |
619 | ||
620 | static int dh_encdoit(kem *k, dstr *d, ghash *h) | |
621 | { | |
622 | dh_encctx *de = (dh_encctx *)k; | |
623 | mp *r = mprand_range(MP_NEW, de->g->r, &rand_global, 0); | |
624 | ge *x = G_CREATE(de->g); | |
625 | ge *y = G_CREATE(de->g); | |
626 | size_t n = de->g->noctets; | |
627 | buf b; | |
45c0fd36 | 628 | |
5c3f75ec | 629 | G_EXP(de->g, x, de->g->g, r); |
630 | G_EXP(de->g, y, de->y, r); | |
631 | dstr_ensure(d, n); | |
632 | buf_init(&b, d->buf, n); | |
633 | G_TORAW(de->g, &b, y); | |
634 | GH_HASH(h, BBASE(&b), BLEN(&b)); | |
635 | buf_init(&b, d->buf, n); | |
636 | G_TORAW(de->g, &b, x); | |
637 | GH_HASH(h, BBASE(&b), BLEN(&b)); | |
638 | d->len += BLEN(&b); | |
639 | mp_drop(r); | |
640 | G_DESTROY(de->g, x); | |
641 | G_DESTROY(de->g, y); | |
642 | return (0); | |
643 | } | |
644 | ||
645 | static const char *dh_enccheck(kem *k) | |
646 | { | |
647 | dh_encctx *de = (dh_encctx *)k; | |
648 | const char *e; | |
649 | if ((e = G_CHECK(de->g, &rand_global)) != 0) | |
650 | return (0); | |
651 | if (group_check(de->g, de->y)) | |
652 | return ("public key not in subgroup"); | |
653 | return (0); | |
654 | } | |
655 | ||
656 | static void dh_encdestroy(kem *k) | |
657 | { | |
658 | dh_encctx *de = (dh_encctx *)k; | |
659 | G_DESTROY(de->g, de->y); | |
660 | mp_drop(de->x); | |
661 | G_DESTROYGROUP(de->g); | |
6f313264 | 662 | DESTROY(de); |
5c3f75ec | 663 | } |
664 | ||
665 | static const kemops dh_encops = { | |
666 | dh_pubfetch, sizeof(dh_pub), | |
667 | dh_encinit, dh_encdoit, dh_enccheck, dh_encdestroy | |
668 | }; | |
669 | ||
3688eb75 | 670 | static const kemops bindh_encops = { |
671 | dh_pubfetch, sizeof(dh_pub), | |
672 | bindh_encinit, dh_encdoit, dh_enccheck, dh_encdestroy | |
673 | }; | |
674 | ||
5c3f75ec | 675 | static const kemops ec_encops = { |
676 | ec_pubfetch, sizeof(ec_pub), | |
677 | ec_encinit, dh_encdoit, dh_enccheck, dh_encdestroy | |
678 | }; | |
679 | ||
680 | static kem *dh_decinit(key *k, void *kd) | |
681 | { | |
682 | dh_priv *dp = kd; | |
3688eb75 | 683 | dh_encctx *de = dh_doinit(k, &dp->dp, dp->y, group_prime, "prime"); |
684 | de->x = MP_COPY(dp->x); | |
685 | return (&de->k); | |
686 | } | |
687 | ||
688 | static kem *bindh_decinit(key *k, void *kd) | |
689 | { | |
690 | dh_priv *dp = kd; | |
691 | dh_encctx *de = dh_doinit(k, &dp->dp, dp->y, group_binary, "binary"); | |
5c3f75ec | 692 | de->x = MP_COPY(dp->x); |
693 | return (&de->k); | |
694 | } | |
695 | ||
696 | static kem *ec_decinit(key *k, void *kd) | |
697 | { | |
698 | ec_priv *ep = kd; | |
699 | dh_encctx *de = ec_doinit(k, ep->cstr, &ep->p); | |
700 | de->x = MP_COPY(ep->x); | |
701 | return (&de->k); | |
702 | } | |
703 | ||
704 | static int dh_decdoit(kem *k, dstr *d, ghash *h) | |
705 | { | |
706 | dh_encctx *de = (dh_encctx *)k; | |
707 | ge *x = G_CREATE(de->g); | |
708 | size_t n = de->g->noctets; | |
709 | void *p = xmalloc(n); | |
710 | buf b; | |
711 | int rc = -1; | |
712 | ||
713 | buf_init(&b, d->buf, d->len); | |
714 | if (G_FROMRAW(de->g, &b, x) || group_check(de->g, x)) | |
715 | goto done; | |
716 | G_EXP(de->g, x, x, de->x); | |
717 | buf_init(&b, p, n); | |
718 | G_TORAW(de->g, &b, x); | |
719 | GH_HASH(h, BBASE(&b), BLEN(&b)); | |
720 | GH_HASH(h, d->buf, d->len); | |
721 | rc = 0; | |
722 | done: | |
723 | G_DESTROY(de->g, x); | |
724 | xfree(p); | |
725 | return (rc); | |
726 | } | |
727 | ||
728 | static const kemops dh_decops = { | |
729 | dh_privfetch, sizeof(dh_priv), | |
730 | dh_decinit, dh_decdoit, dh_enccheck, dh_encdestroy | |
731 | }; | |
732 | ||
3688eb75 | 733 | static const kemops bindh_decops = { |
734 | dh_privfetch, sizeof(dh_priv), | |
735 | bindh_decinit, dh_decdoit, dh_enccheck, dh_encdestroy | |
736 | }; | |
737 | ||
5c3f75ec | 738 | static const kemops ec_decops = { |
739 | ec_privfetch, sizeof(ec_priv), | |
740 | ec_decinit, dh_decdoit, dh_enccheck, dh_encdestroy | |
741 | }; | |
742 | ||
593f7bd3 MW |
743 | /* --- X25519 and similar schemes --- */ |
744 | ||
745 | #define XDHS(_) \ | |
746 | _(x25519, X25519) \ | |
747 | _(x448, X448) | |
748 | ||
749 | #define XDHDEF(xdh, XDH) \ | |
750 | \ | |
751 | static kem *xdh##_encinit(key *k, void *kd) { return (CREATE(kem)); } \ | |
752 | static void xdh##_encdestroy(kem *k) { DESTROY(k); } \ | |
753 | \ | |
754 | static const char *xdh##_enccheck(kem *k) \ | |
755 | { \ | |
756 | xdh##_pub *kd = k->kd; \ | |
757 | \ | |
758 | if (kd->pub.sz != XDH##_PUBSZ) \ | |
759 | return ("incorrect " #XDH "public key length"); \ | |
760 | return (0); \ | |
761 | } \ | |
762 | \ | |
763 | static int xdh##_encdoit(kem *k, dstr *d, ghash *h) \ | |
764 | { \ | |
765 | octet t[XDH##_KEYSZ], z[XDH##_OUTSZ]; \ | |
766 | xdh##_pub *kd = k->kd; \ | |
767 | \ | |
768 | rand_get(RAND_GLOBAL, t, sizeof(t)); \ | |
769 | dstr_ensure(d, XDH##_PUBSZ); \ | |
770 | xdh((octet *)d->buf, t, xdh##_base); \ | |
771 | xdh(z, t, kd->pub.k); \ | |
772 | d->len += XDH##_PUBSZ; \ | |
773 | GH_HASH(h, d->buf, XDH##_PUBSZ); \ | |
774 | GH_HASH(h, z, XDH##_OUTSZ); \ | |
775 | return (0); \ | |
776 | } \ | |
777 | \ | |
778 | static const char *xdh##_deccheck(kem *k) \ | |
779 | { \ | |
780 | xdh##_priv *kd = k->kd; \ | |
781 | \ | |
782 | if (kd->priv.sz != XDH##_KEYSZ) \ | |
783 | return ("incorrect " #XDH " private key length"); \ | |
784 | if (kd->pub.sz != XDH##_PUBSZ) \ | |
785 | return ("incorrect " #XDH " public key length"); \ | |
786 | return (0); \ | |
787 | } \ | |
788 | \ | |
789 | static int xdh##_decdoit(kem *k, dstr *d, ghash *h) \ | |
790 | { \ | |
791 | octet z[XDH##_OUTSZ]; \ | |
792 | xdh##_priv *kd = k->kd; \ | |
793 | int rc = -1; \ | |
794 | \ | |
795 | if (d->len != XDH##_PUBSZ) goto done; \ | |
796 | xdh(z, kd->priv.k, (const octet *)d->buf); \ | |
797 | GH_HASH(h, d->buf, XDH##_PUBSZ); \ | |
798 | GH_HASH(h, z, XDH##_OUTSZ); \ | |
799 | rc = 0; \ | |
800 | done: \ | |
801 | return (rc); \ | |
802 | } \ | |
803 | \ | |
804 | static const kemops xdh##_encops = { \ | |
805 | xdh##_pubfetch, sizeof(xdh##_pub), \ | |
806 | xdh##_encinit, xdh##_encdoit, xdh##_enccheck, xdh##_encdestroy \ | |
807 | }; \ | |
808 | \ | |
809 | static const kemops xdh##_decops = { \ | |
810 | xdh##_privfetch, sizeof(xdh##_priv), \ | |
811 | xdh##_encinit, xdh##_decdoit, xdh##_deccheck, xdh##_encdestroy \ | |
812 | }; | |
813 | ||
814 | XDHS(XDHDEF) | |
815 | #undef XDHDEF | |
643eb1bb | 816 | |
02dfbd5b MW |
817 | /* --- Symmetric --- */ |
818 | ||
819 | typedef struct symm_ctx { | |
820 | kem k; | |
821 | key_packdef kp; | |
822 | key_bin kb; | |
823 | } symm_ctx; | |
824 | ||
825 | static kem *symm_init(key *k, void *kd) | |
826 | { | |
827 | symm_ctx *s; | |
828 | dstr d = DSTR_INIT; | |
829 | int err; | |
830 | ||
831 | s = CREATE(symm_ctx); | |
832 | ||
833 | key_fulltag(k, &d); | |
834 | s->kp.e = KENC_BINARY; | |
835 | s->kp.p = &s->kb; | |
836 | s->kp.kd = 0; | |
837 | ||
838 | if ((err = key_unpack(&s->kp, kd, &d)) != 0) { | |
839 | die(EXIT_FAILURE, "failed to unpack symmetric key `%s': %s", | |
840 | d.buf, key_strerror(err)); | |
841 | } | |
842 | dstr_destroy(&d); | |
843 | return (&s->k); | |
844 | } | |
845 | ||
846 | static int symm_decdoit(kem *k, dstr *d, ghash *h) | |
847 | { | |
848 | symm_ctx *s = (symm_ctx *)k; | |
849 | ||
850 | GH_HASH(h, s->kb.k, s->kb.sz); | |
851 | GH_HASH(h, d->buf, d->len); | |
852 | return (0); | |
853 | } | |
854 | ||
855 | static int symm_encdoit(kem *k, dstr *d, ghash *h) | |
856 | { | |
857 | dstr_ensure(d, h->ops->c->hashsz); | |
858 | d->len += h->ops->c->hashsz; | |
859 | rand_get(RAND_GLOBAL, d->buf, d->len); | |
860 | return (symm_decdoit(k, d, h)); | |
861 | } | |
862 | ||
863 | static const char *symm_check(kem *k) { return (0); } | |
864 | ||
865 | static void symm_destroy(kem *k) | |
866 | { symm_ctx *s = (symm_ctx *)k; key_unpackdone(&s->kp); } | |
867 | ||
868 | static const kemops symm_encops = { | |
869 | 0, 0, | |
870 | symm_init, symm_encdoit, symm_check, symm_destroy | |
871 | }; | |
872 | ||
873 | static const kemops symm_decops = { | |
874 | 0, 0, | |
875 | symm_init, symm_decdoit, symm_check, symm_destroy | |
876 | }; | |
877 | ||
5c3f75ec | 878 | /* --- The switch table --- */ |
879 | ||
c65df279 | 880 | const struct kemtab kemtab[] = { |
5c3f75ec | 881 | { "rsa", &rsa_encops, &rsa_decops }, |
882 | { "dh", &dh_encops, &dh_decops }, | |
3688eb75 | 883 | { "bindh", &bindh_encops, &bindh_decops }, |
5c3f75ec | 884 | { "ec", &ec_encops, &ec_decops }, |
593f7bd3 MW |
885 | #define XDHTAB(xdh, XDH) \ |
886 | { #xdh, &xdh##_encops, &xdh##_decops }, | |
887 | XDHS(XDHTAB) | |
888 | #undef XDHTAB | |
02dfbd5b | 889 | { "symm", &symm_encops, &symm_decops }, |
5c3f75ec | 890 | { 0, 0, 0 } |
891 | }; | |
892 | ||
893 | /* --- @getkem@ --- * | |
894 | * | |
895 | * Arguments: @key *k@ = the key to load | |
896 | * @const char *app@ = application name | |
897 | * @int wantpriv@ = nonzero if we want to decrypt | |
66ff643c | 898 | * @bulk **bc@ = bulk crypto context to set up |
5c3f75ec | 899 | * |
900 | * Returns: A key-encapsulating thing. | |
901 | * | |
902 | * Use: Loads a key. | |
903 | */ | |
904 | ||
66ff643c | 905 | kem *getkem(key *k, const char *app, int wantpriv, bulk **bc) |
5c3f75ec | 906 | { |
66ff643c | 907 | const char *kalg, *halg = 0, *balg = 0; |
5c3f75ec | 908 | dstr d = DSTR_INIT; |
909 | dstr t = DSTR_INIT; | |
910 | size_t n; | |
911 | char *p = 0; | |
912 | const char *q; | |
913 | kem *kk; | |
914 | const struct kemtab *kt; | |
915 | const kemops *ko; | |
66ff643c MW |
916 | const struct bulktab *bt; |
917 | const bulkops *bo; | |
5c3f75ec | 918 | void *kd; |
919 | int e; | |
920 | key_packdef *kp; | |
921 | ||
922 | /* --- Setup stuff --- */ | |
923 | ||
924 | key_fulltag(k, &t); | |
925 | ||
926 | /* --- Get the KEM name --- * | |
927 | * | |
928 | * Take the attribute if it's there; otherwise use the key type. | |
929 | */ | |
930 | ||
931 | n = strlen(app); | |
932 | if ((q = key_getattr(0, k, "kem")) != 0) { | |
933 | dstr_puts(&d, q); | |
934 | p = d.buf; | |
935 | } else if (strncmp(k->type, app, n) == 0 && k->type[n] == '-') { | |
936 | dstr_puts(&d, k->type); | |
937 | p = d.buf + n + 1; | |
938 | } else | |
939 | die(EXIT_FAILURE, "no KEM for key `%s'", t.buf); | |
940 | kalg = p; | |
941 | ||
66ff643c | 942 | /* --- Grab the bulk encryption scheme --- * |
5c3f75ec | 943 | * |
944 | * Grab it from the KEM if it's there, but override it from the attribute. | |
945 | */ | |
946 | ||
947 | if (p && (p = strchr(p, '/')) != 0) { | |
948 | *p++ = 0; | |
66ff643c | 949 | balg = p; |
5c3f75ec | 950 | } |
66ff643c MW |
951 | if ((q = key_getattr(0, k, "bulk")) != 0) |
952 | balg = q; | |
5c3f75ec | 953 | |
954 | /* --- Grab the hash function --- */ | |
955 | ||
956 | if (p && (p = strchr(p, '/')) != 0) { | |
957 | *p++ = 0; | |
958 | halg = p; | |
959 | } | |
960 | if ((q = key_getattr(0, k, "hash")) != 0) | |
961 | halg = q; | |
962 | ||
963 | /* --- Instantiate the KEM --- */ | |
964 | ||
965 | for (kt = kemtab; kt->name; kt++) { | |
966 | if (strcmp(kt->name, kalg) == 0) | |
967 | goto k_found; | |
968 | } | |
969 | die(EXIT_FAILURE, "key encapsulation mechanism `%s' not found in key `%s'", | |
970 | kalg, t.buf); | |
971 | k_found:; | |
972 | ko = wantpriv ? kt->decops : kt->encops; | |
02dfbd5b MW |
973 | if (!ko->kf) { |
974 | kd = k->k; | |
975 | key_incref(kd); | |
78ec50fa | 976 | kp = 0; |
02dfbd5b MW |
977 | } else { |
978 | kd = xmalloc(ko->kdsz); | |
979 | kp = key_fetchinit(ko->kf, 0, kd); | |
980 | if ((e = key_fetch(kp, k)) != 0) { | |
981 | die(EXIT_FAILURE, "error fetching key `%s': %s", | |
982 | t.buf, key_strerror(e)); | |
983 | } | |
984 | } | |
5c3f75ec | 985 | kk = ko->init(k, kd); |
986 | kk->kp = kp; | |
987 | kk->ops = ko; | |
988 | kk->kd = kd; | |
989 | ||
66ff643c | 990 | /* --- Set up the bulk crypto --- */ |
5c3f75ec | 991 | |
992 | if (!halg) | |
66ff643c MW |
993 | kk->hc = &rmd160; |
994 | else if ((kk->hc = ghash_byname(halg)) == 0) { | |
5c3f75ec | 995 | die(EXIT_FAILURE, "hash algorithm `%s' not found in key `%s'", |
996 | halg, t.buf); | |
997 | } | |
998 | ||
66ff643c MW |
999 | if (!balg) |
1000 | bt = bulktab; | |
1001 | else { | |
1002 | for (bt = bulktab, bo = 0; bt->name; bt++) { | |
1003 | if (strcmp(balg, bt->name) == 0) | |
1004 | { balg = 0; goto b_found; } | |
1005 | n = strlen(bt->name); | |
1006 | if (strncmp(balg, bt->name, n) == 0 && balg[n] == '-') | |
1007 | { balg += n + 1; goto b_found; } | |
1008 | } | |
1009 | bt = bulktab; | |
1010 | b_found:; | |
5c3f75ec | 1011 | } |
66ff643c MW |
1012 | bo = wantpriv ? bt->decops : bt->encops; |
1013 | *bc = bo->init(k, balg, kk->hc->name); | |
1014 | (*bc)->ops = bo; | |
5c3f75ec | 1015 | |
c90ce6bb MW |
1016 | dstr_reset(&d); |
1017 | if ((q = key_getattr(0, k, "kdf")) == 0) { | |
1018 | dstr_putf(&d, "%s-mgf", kk->hc->name); | |
1019 | q = d.buf; | |
1020 | } | |
1021 | if ((kk->cxc = gcipher_byname(q)) == 0) { | |
1022 | die(EXIT_FAILURE, "encryption scheme (KDF) `%s' not found in key `%s'", | |
1023 | q, t.buf); | |
1024 | } | |
1025 | ||
5c3f75ec | 1026 | /* --- Tidy up --- */ |
1027 | ||
1028 | dstr_destroy(&d); | |
1029 | dstr_destroy(&t); | |
1030 | return (kk); | |
1031 | } | |
1032 | ||
1033 | /* --- @setupkem@ --- * | |
1034 | * | |
1035 | * Arguments: @kem *k@ = key-encapsulation thing | |
1036 | * @dstr *d@ = key-encapsulation data | |
66ff643c | 1037 | * @bulk *bc@ = bulk crypto context to set up |
5c3f75ec | 1038 | * |
1039 | * Returns: Zero on success, nonzero on failure. | |
1040 | * | |
1041 | * Use: Initializes all the various symmetric things from a KEM. | |
1042 | */ | |
1043 | ||
66ff643c | 1044 | int setupkem(kem *k, dstr *d, bulk *bc) |
5c3f75ec | 1045 | { |
1046 | octet *kd; | |
66ff643c | 1047 | size_t n; |
5c3f75ec | 1048 | ghash *h; |
c65df279 | 1049 | int rc = -1; |
5c3f75ec | 1050 | |
66ff643c | 1051 | h = GH_INIT(k->hc); |
5c3f75ec | 1052 | if (k->ops->doit(k, d, h)) |
1053 | goto done; | |
66ff643c | 1054 | n = keysz(GH_CLASS(h)->hashsz, k->cxc->keysz); |
5c3f75ec | 1055 | if (!n) |
1056 | goto done; | |
1057 | kd = GH_DONE(h, 0); | |
66ff643c MW |
1058 | k->cx = GC_INIT(k->cxc, kd, n); |
1059 | bc->ops->setup(bc, k->cx); | |
5c3f75ec | 1060 | |
1061 | rc = 0; | |
1062 | done: | |
1063 | GH_DESTROY(h); | |
1064 | return (rc); | |
1065 | } | |
1066 | ||
1067 | /* --- @freekem@ --- * | |
1068 | * | |
1069 | * Arguments: @kem *k@ = key-encapsulation thing | |
1070 | * | |
1071 | * Returns: --- | |
1072 | * | |
1073 | * Use: Frees up a key-encapsulation thing. | |
1074 | */ | |
1075 | ||
1076 | void freekem(kem *k) | |
1077 | { | |
02dfbd5b MW |
1078 | if (!k->ops->kf) |
1079 | key_drop(k->kd); | |
1080 | else { | |
1081 | key_fetchdone(k->kp); | |
1082 | xfree(k->kd); | |
1083 | } | |
66ff643c | 1084 | GC_DESTROY(k->cx); |
5c3f75ec | 1085 | k->ops->destroy(k); |
1086 | } | |
1087 | ||
1088 | /*----- That's all, folks -------------------------------------------------*/ |