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1 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL | |
2 | * project 2006. | |
3 | */ | |
4 | /* ==================================================================== | |
5 | * Copyright (c) 2006 The OpenSSL Project. All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in | |
16 | * the documentation and/or other materials provided with the | |
17 | * distribution. | |
18 | * | |
19 | * 3. All advertising materials mentioning features or use of this | |
20 | * software must display the following acknowledgment: | |
21 | * "This product includes software developed by the OpenSSL Project | |
22 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
23 | * | |
24 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
25 | * endorse or promote products derived from this software without | |
26 | * prior written permission. For written permission, please contact | |
27 | * licensing@OpenSSL.org. | |
28 | * | |
29 | * 5. Products derived from this software may not be called "OpenSSL" | |
30 | * nor may "OpenSSL" appear in their names without prior written | |
31 | * permission of the OpenSSL Project. | |
32 | * | |
33 | * 6. Redistributions of any form whatsoever must retain the following | |
34 | * acknowledgment: | |
35 | * "This product includes software developed by the OpenSSL Project | |
36 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
37 | * | |
38 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
39 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
41 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
42 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
47 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
48 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
49 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
50 | * ==================================================================== | |
51 | * | |
52 | * This product includes cryptographic software written by Eric Young | |
53 | * (eay@cryptsoft.com). This product includes software written by Tim | |
54 | * Hudson (tjh@cryptsoft.com). | |
55 | * | |
56 | */ | |
57 | ||
58 | #include <stdio.h> | |
59 | #include "cryptlib.h" | |
60 | #include <openssl/x509.h> | |
61 | #include <openssl/asn1.h> | |
62 | #include <openssl/dh.h> | |
63 | #include <openssl/bn.h> | |
64 | #include "asn1_locl.h" | |
65 | #ifndef OPENSSL_NO_CMS | |
66 | #include <openssl/cms.h> | |
67 | #endif | |
68 | ||
69 | extern const EVP_PKEY_ASN1_METHOD dhx_asn1_meth; | |
70 | ||
71 | /* i2d/d2i like DH parameter functions which use the appropriate routine | |
72 | * for PKCS#3 DH or X9.42 DH. | |
73 | */ | |
74 | ||
75 | static DH * d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp, long length) | |
76 | { | |
77 | if (pkey->ameth == &dhx_asn1_meth) | |
78 | return d2i_DHxparams(NULL, pp, length); | |
79 | return d2i_DHparams(NULL, pp, length); | |
80 | } | |
81 | ||
82 | static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp) | |
83 | { | |
84 | if (pkey->ameth == &dhx_asn1_meth) | |
85 | return i2d_DHxparams(a, pp); | |
86 | return i2d_DHparams(a, pp); | |
87 | } | |
88 | ||
89 | static void int_dh_free(EVP_PKEY *pkey) | |
90 | { | |
91 | DH_free(pkey->pkey.dh); | |
92 | } | |
93 | ||
94 | static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) | |
95 | { | |
96 | const unsigned char *p, *pm; | |
97 | int pklen, pmlen; | |
98 | int ptype; | |
99 | void *pval; | |
100 | ASN1_STRING *pstr; | |
101 | X509_ALGOR *palg; | |
102 | ASN1_INTEGER *public_key = NULL; | |
103 | ||
104 | DH *dh = NULL; | |
105 | ||
106 | if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) | |
107 | return 0; | |
108 | X509_ALGOR_get0(NULL, &ptype, &pval, palg); | |
109 | ||
110 | if (ptype != V_ASN1_SEQUENCE) | |
111 | { | |
112 | DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR); | |
113 | goto err; | |
114 | } | |
115 | ||
116 | pstr = pval; | |
117 | pm = pstr->data; | |
118 | pmlen = pstr->length; | |
119 | ||
120 | if (!(dh = d2i_dhp(pkey, &pm, pmlen))) | |
121 | { | |
122 | DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); | |
123 | goto err; | |
124 | } | |
125 | ||
126 | if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) | |
127 | { | |
128 | DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); | |
129 | goto err; | |
130 | } | |
131 | ||
132 | /* We have parameters now set public key */ | |
133 | if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) | |
134 | { | |
135 | DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR); | |
136 | goto err; | |
137 | } | |
138 | ||
139 | ASN1_INTEGER_free(public_key); | |
140 | EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh); | |
141 | return 1; | |
142 | ||
143 | err: | |
144 | if (public_key) | |
145 | ASN1_INTEGER_free(public_key); | |
146 | if (dh) | |
147 | DH_free(dh); | |
148 | return 0; | |
149 | ||
150 | } | |
151 | ||
152 | static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) | |
153 | { | |
154 | DH *dh; | |
155 | void *pval = NULL; | |
156 | int ptype; | |
157 | unsigned char *penc = NULL; | |
158 | int penclen; | |
159 | ASN1_STRING *str; | |
160 | ASN1_INTEGER *pub_key = NULL; | |
161 | ||
162 | dh=pkey->pkey.dh; | |
163 | ||
164 | str = ASN1_STRING_new(); | |
165 | str->length = i2d_dhp(pkey, dh, &str->data); | |
166 | if (str->length <= 0) | |
167 | { | |
168 | DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); | |
169 | goto err; | |
170 | } | |
171 | pval = str; | |
172 | ptype = V_ASN1_SEQUENCE; | |
173 | ||
174 | pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL); | |
175 | if (!pub_key) | |
176 | goto err; | |
177 | ||
178 | penclen = i2d_ASN1_INTEGER(pub_key, &penc); | |
179 | ||
180 | ASN1_INTEGER_free(pub_key); | |
181 | ||
182 | if (penclen <= 0) | |
183 | { | |
184 | DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); | |
185 | goto err; | |
186 | } | |
187 | ||
188 | if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id), | |
189 | ptype, pval, penc, penclen)) | |
190 | return 1; | |
191 | ||
192 | err: | |
193 | if (penc) | |
194 | OPENSSL_free(penc); | |
195 | if (pval) | |
196 | ASN1_STRING_free(pval); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | ||
202 | /* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in | |
203 | * that the AlgorithmIdentifier contains the parameters, the private key | |
204 | * is explcitly included and the pubkey must be recalculated. | |
205 | */ | |
206 | ||
207 | static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) | |
208 | { | |
209 | const unsigned char *p, *pm; | |
210 | int pklen, pmlen; | |
211 | int ptype; | |
212 | void *pval; | |
213 | ASN1_STRING *pstr; | |
214 | X509_ALGOR *palg; | |
215 | ASN1_INTEGER *privkey = NULL; | |
216 | ||
217 | DH *dh = NULL; | |
218 | ||
219 | if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) | |
220 | return 0; | |
221 | ||
222 | X509_ALGOR_get0(NULL, &ptype, &pval, palg); | |
223 | ||
224 | if (ptype != V_ASN1_SEQUENCE) | |
225 | goto decerr; | |
226 | ||
227 | if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen))) | |
228 | goto decerr; | |
229 | ||
230 | ||
231 | pstr = pval; | |
232 | pm = pstr->data; | |
233 | pmlen = pstr->length; | |
234 | if (!(dh = d2i_dhp(pkey, &pm, pmlen))) | |
235 | goto decerr; | |
236 | /* We have parameters now set private key */ | |
237 | if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) | |
238 | { | |
239 | DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR); | |
240 | goto dherr; | |
241 | } | |
242 | /* Calculate public key */ | |
243 | if (!DH_generate_key(dh)) | |
244 | goto dherr; | |
245 | ||
246 | EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh); | |
247 | ||
248 | ASN1_INTEGER_free(privkey); | |
249 | ||
250 | return 1; | |
251 | ||
252 | decerr: | |
253 | DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR); | |
254 | dherr: | |
255 | DH_free(dh); | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) | |
260 | { | |
261 | ASN1_STRING *params = NULL; | |
262 | ASN1_INTEGER *prkey = NULL; | |
263 | unsigned char *dp = NULL; | |
264 | int dplen; | |
265 | ||
266 | params = ASN1_STRING_new(); | |
267 | ||
268 | if (!params) | |
269 | { | |
270 | DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); | |
271 | goto err; | |
272 | } | |
273 | ||
274 | params->length = i2d_dhp(pkey, pkey->pkey.dh, ¶ms->data); | |
275 | if (params->length <= 0) | |
276 | { | |
277 | DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); | |
278 | goto err; | |
279 | } | |
280 | params->type = V_ASN1_SEQUENCE; | |
281 | ||
282 | /* Get private key into integer */ | |
283 | prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL); | |
284 | ||
285 | if (!prkey) | |
286 | { | |
287 | DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR); | |
288 | goto err; | |
289 | } | |
290 | ||
291 | dplen = i2d_ASN1_INTEGER(prkey, &dp); | |
292 | ||
293 | ASN1_INTEGER_free(prkey); | |
294 | ||
295 | if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0, | |
296 | V_ASN1_SEQUENCE, params, dp, dplen)) | |
297 | goto err; | |
298 | ||
299 | return 1; | |
300 | ||
301 | err: | |
302 | if (dp != NULL) | |
303 | OPENSSL_free(dp); | |
304 | if (params != NULL) | |
305 | ASN1_STRING_free(params); | |
306 | if (prkey != NULL) | |
307 | ASN1_INTEGER_free(prkey); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | ||
312 | static void update_buflen(const BIGNUM *b, size_t *pbuflen) | |
313 | { | |
314 | size_t i; | |
315 | if (!b) | |
316 | return; | |
317 | if (*pbuflen < (i = (size_t)BN_num_bytes(b))) | |
318 | *pbuflen = i; | |
319 | } | |
320 | ||
321 | static int dh_param_decode(EVP_PKEY *pkey, | |
322 | const unsigned char **pder, int derlen) | |
323 | { | |
324 | DH *dh; | |
325 | if (!(dh = d2i_dhp(pkey, pder, derlen))) | |
326 | { | |
327 | DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB); | |
328 | return 0; | |
329 | } | |
330 | EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh); | |
331 | return 1; | |
332 | } | |
333 | ||
334 | static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder) | |
335 | { | |
336 | return i2d_dhp(pkey, pkey->pkey.dh, pder); | |
337 | } | |
338 | ||
339 | static int do_dh_print(BIO *bp, const DH *x, int indent, | |
340 | ASN1_PCTX *ctx, int ptype) | |
341 | { | |
342 | unsigned char *m=NULL; | |
343 | int reason=ERR_R_BUF_LIB,ret=0; | |
344 | size_t buf_len=0; | |
345 | ||
346 | const char *ktype = NULL; | |
347 | ||
348 | BIGNUM *priv_key, *pub_key; | |
349 | ||
350 | if (ptype == 2) | |
351 | priv_key = x->priv_key; | |
352 | else | |
353 | priv_key = NULL; | |
354 | ||
355 | if (ptype > 0) | |
356 | pub_key = x->pub_key; | |
357 | else | |
358 | pub_key = NULL; | |
359 | ||
360 | update_buflen(x->p, &buf_len); | |
361 | ||
362 | if (buf_len == 0) | |
363 | { | |
364 | reason = ERR_R_PASSED_NULL_PARAMETER; | |
365 | goto err; | |
366 | } | |
367 | ||
368 | update_buflen(x->g, &buf_len); | |
369 | update_buflen(x->q, &buf_len); | |
370 | update_buflen(x->j, &buf_len); | |
371 | update_buflen(x->counter, &buf_len); | |
372 | update_buflen(pub_key, &buf_len); | |
373 | update_buflen(priv_key, &buf_len); | |
374 | ||
375 | if (ptype == 2) | |
376 | ktype = "DH Private-Key"; | |
377 | else if (ptype == 1) | |
378 | ktype = "DH Public-Key"; | |
379 | else | |
380 | ktype = "DH Parameters"; | |
381 | ||
382 | m= OPENSSL_malloc(buf_len+10); | |
383 | if (m == NULL) | |
384 | { | |
385 | reason=ERR_R_MALLOC_FAILURE; | |
386 | goto err; | |
387 | } | |
388 | ||
389 | BIO_indent(bp, indent, 128); | |
390 | if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0) | |
391 | goto err; | |
392 | indent += 4; | |
393 | ||
394 | if (!ASN1_bn_print(bp,"private-key:",priv_key,m,indent)) goto err; | |
395 | if (!ASN1_bn_print(bp,"public-key:",pub_key,m,indent)) goto err; | |
396 | ||
397 | if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err; | |
398 | if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err; | |
399 | if (x->q && !ASN1_bn_print(bp,"subgroup order:",x->q,m,indent)) goto err; | |
400 | if (x->j && !ASN1_bn_print(bp,"subgroup factor:",x->j,m,indent)) | |
401 | goto err; | |
402 | if (x->seed) | |
403 | { | |
404 | int i; | |
405 | BIO_indent(bp, indent, 128); | |
406 | BIO_puts(bp, "seed:"); | |
407 | for (i=0; i < x->seedlen; i++) | |
408 | { | |
409 | if ((i%15) == 0) | |
410 | { | |
411 | if(BIO_puts(bp,"\n") <= 0 | |
412 | || !BIO_indent(bp,indent+4,128)) | |
413 | goto err; | |
414 | } | |
415 | if (BIO_printf(bp,"%02x%s", x->seed[i], | |
416 | ((i+1) == x->seedlen)?"":":") <= 0) | |
417 | goto err; | |
418 | } | |
419 | if (BIO_write(bp,"\n",1) <= 0) return(0); | |
420 | } | |
421 | if (x->counter && !ASN1_bn_print(bp,"counter:",x->counter,m,indent)) | |
422 | goto err; | |
423 | if (x->length != 0) | |
424 | { | |
425 | BIO_indent(bp, indent, 128); | |
426 | if (BIO_printf(bp,"recommended-private-length: %d bits\n", | |
427 | (int)x->length) <= 0) goto err; | |
428 | } | |
429 | ||
430 | ||
431 | ret=1; | |
432 | if (0) | |
433 | { | |
434 | err: | |
435 | DHerr(DH_F_DO_DH_PRINT,reason); | |
436 | } | |
437 | if (m != NULL) OPENSSL_free(m); | |
438 | return(ret); | |
439 | } | |
440 | ||
441 | static int int_dh_size(const EVP_PKEY *pkey) | |
442 | { | |
443 | return(DH_size(pkey->pkey.dh)); | |
444 | } | |
445 | ||
446 | static int dh_bits(const EVP_PKEY *pkey) | |
447 | { | |
448 | return BN_num_bits(pkey->pkey.dh->p); | |
449 | } | |
450 | ||
451 | static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) | |
452 | { | |
453 | if ( BN_cmp(a->pkey.dh->p,b->pkey.dh->p) || | |
454 | BN_cmp(a->pkey.dh->g,b->pkey.dh->g)) | |
455 | return 0; | |
456 | else if (a->ameth == &dhx_asn1_meth) | |
457 | { | |
458 | if (BN_cmp(a->pkey.dh->q,b->pkey.dh->q)) | |
459 | return 0; | |
460 | } | |
461 | return 1; | |
462 | } | |
463 | ||
464 | static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src) | |
465 | { | |
466 | BIGNUM *a; | |
467 | if (src) | |
468 | { | |
469 | a = BN_dup(src); | |
470 | if (!a) | |
471 | return 0; | |
472 | } | |
473 | else | |
474 | a = NULL; | |
475 | if (*dst) | |
476 | BN_free(*dst); | |
477 | *dst = a; | |
478 | return 1; | |
479 | } | |
480 | ||
481 | static int int_dh_param_copy(DH *to, const DH *from, int is_x942) | |
482 | { | |
483 | if (is_x942 == -1) | |
484 | is_x942 = !!from->q; | |
485 | if (!int_dh_bn_cpy(&to->p, from->p)) | |
486 | return 0; | |
487 | if (!int_dh_bn_cpy(&to->g, from->g)) | |
488 | return 0; | |
489 | if (is_x942) | |
490 | { | |
491 | if (!int_dh_bn_cpy(&to->q, from->q)) | |
492 | return 0; | |
493 | if (!int_dh_bn_cpy(&to->j, from->j)) | |
494 | return 0; | |
495 | if(to->seed) | |
496 | { | |
497 | OPENSSL_free(to->seed); | |
498 | to->seed = NULL; | |
499 | to->seedlen = 0; | |
500 | } | |
501 | if (from->seed) | |
502 | { | |
503 | to->seed = BUF_memdup(from->seed, from->seedlen); | |
504 | if (!to->seed) | |
505 | return 0; | |
506 | to->seedlen = from->seedlen; | |
507 | } | |
508 | } | |
509 | else | |
510 | to->length = from->length; | |
511 | return 1; | |
512 | } | |
513 | ||
514 | ||
515 | DH *DHparams_dup(DH *dh) | |
516 | { | |
517 | DH *ret; | |
518 | ret = DH_new(); | |
519 | if (!ret) | |
520 | return NULL; | |
521 | if (!int_dh_param_copy(ret, dh, -1)) | |
522 | { | |
523 | DH_free(ret); | |
524 | return NULL; | |
525 | } | |
526 | return ret; | |
527 | } | |
528 | ||
529 | static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) | |
530 | { | |
531 | return int_dh_param_copy(to->pkey.dh, from->pkey.dh, | |
532 | from->ameth == &dhx_asn1_meth); | |
533 | } | |
534 | ||
535 | static int dh_missing_parameters(const EVP_PKEY *a) | |
536 | { | |
537 | if (!a->pkey.dh->p || !a->pkey.dh->g) | |
538 | return 1; | |
539 | return 0; | |
540 | } | |
541 | ||
542 | static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) | |
543 | { | |
544 | if (dh_cmp_parameters(a, b) == 0) | |
545 | return 0; | |
546 | if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->pub_key) != 0) | |
547 | return 0; | |
548 | else | |
549 | return 1; | |
550 | } | |
551 | ||
552 | static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
553 | ASN1_PCTX *ctx) | |
554 | { | |
555 | return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0); | |
556 | } | |
557 | ||
558 | static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
559 | ASN1_PCTX *ctx) | |
560 | { | |
561 | return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1); | |
562 | } | |
563 | ||
564 | static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
565 | ASN1_PCTX *ctx) | |
566 | { | |
567 | return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2); | |
568 | } | |
569 | ||
570 | int DHparams_print(BIO *bp, const DH *x) | |
571 | { | |
572 | return do_dh_print(bp, x, 4, NULL, 0); | |
573 | } | |
574 | ||
575 | #ifndef OPENSSL_NO_CMS | |
576 | static int dh_cms_decrypt(CMS_RecipientInfo *ri); | |
577 | static int dh_cms_encrypt(CMS_RecipientInfo *ri); | |
578 | #endif | |
579 | ||
580 | static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) | |
581 | { | |
582 | switch (op) | |
583 | { | |
584 | #ifndef OPENSSL_NO_CMS | |
585 | ||
586 | case ASN1_PKEY_CTRL_CMS_ENVELOPE: | |
587 | if (arg1 == 1) | |
588 | return dh_cms_decrypt(arg2); | |
589 | else if (arg1 == 0) | |
590 | return dh_cms_encrypt(arg2); | |
591 | return -2; | |
592 | ||
593 | case ASN1_PKEY_CTRL_CMS_RI_TYPE: | |
594 | *(int *)arg2 = CMS_RECIPINFO_AGREE; | |
595 | return 1; | |
596 | #endif | |
597 | default: | |
598 | return -2; | |
599 | } | |
600 | ||
601 | } | |
602 | ||
603 | const EVP_PKEY_ASN1_METHOD dh_asn1_meth = | |
604 | { | |
605 | EVP_PKEY_DH, | |
606 | EVP_PKEY_DH, | |
607 | 0, | |
608 | ||
609 | "DH", | |
610 | "OpenSSL PKCS#3 DH method", | |
611 | ||
612 | dh_pub_decode, | |
613 | dh_pub_encode, | |
614 | dh_pub_cmp, | |
615 | dh_public_print, | |
616 | ||
617 | dh_priv_decode, | |
618 | dh_priv_encode, | |
619 | dh_private_print, | |
620 | ||
621 | int_dh_size, | |
622 | dh_bits, | |
623 | ||
624 | dh_param_decode, | |
625 | dh_param_encode, | |
626 | dh_missing_parameters, | |
627 | dh_copy_parameters, | |
628 | dh_cmp_parameters, | |
629 | dh_param_print, | |
630 | 0, | |
631 | ||
632 | int_dh_free, | |
633 | 0 | |
634 | }; | |
635 | ||
636 | const EVP_PKEY_ASN1_METHOD dhx_asn1_meth = | |
637 | { | |
638 | EVP_PKEY_DHX, | |
639 | EVP_PKEY_DHX, | |
640 | 0, | |
641 | ||
642 | "X9.42 DH", | |
643 | "OpenSSL X9.42 DH method", | |
644 | ||
645 | dh_pub_decode, | |
646 | dh_pub_encode, | |
647 | dh_pub_cmp, | |
648 | dh_public_print, | |
649 | ||
650 | dh_priv_decode, | |
651 | dh_priv_encode, | |
652 | dh_private_print, | |
653 | ||
654 | int_dh_size, | |
655 | dh_bits, | |
656 | ||
657 | dh_param_decode, | |
658 | dh_param_encode, | |
659 | dh_missing_parameters, | |
660 | dh_copy_parameters, | |
661 | dh_cmp_parameters, | |
662 | dh_param_print, | |
663 | 0, | |
664 | ||
665 | int_dh_free, | |
666 | dh_pkey_ctrl | |
667 | }; | |
668 | #ifndef OPENSSL_NO_CMS | |
669 | ||
670 | static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx, | |
671 | X509_ALGOR *alg, ASN1_BIT_STRING *pubkey) | |
672 | { | |
673 | ASN1_OBJECT *aoid; | |
674 | int atype; | |
675 | void *aval; | |
676 | ASN1_INTEGER *public_key = NULL; | |
677 | int rv = 0; | |
678 | EVP_PKEY *pkpeer = NULL, *pk = NULL; | |
679 | DH *dhpeer = NULL; | |
680 | const unsigned char *p; | |
681 | int plen; | |
682 | ||
683 | X509_ALGOR_get0(&aoid, &atype, &aval, alg); | |
684 | if (OBJ_obj2nid(aoid) != NID_dhpublicnumber) | |
685 | goto err; | |
686 | /* Only absent parameters allowed in RFC XXXX */ | |
687 | if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL) | |
688 | goto err; | |
689 | ||
690 | pk = EVP_PKEY_CTX_get0_pkey(pctx); | |
691 | if (!pk) | |
692 | goto err; | |
693 | if (pk->type != EVP_PKEY_DHX) | |
694 | goto err; | |
695 | /* Get parameters from parent key */ | |
696 | dhpeer = DHparams_dup(pk->pkey.dh); | |
697 | /* We have parameters now set public key */ | |
698 | plen = ASN1_STRING_length(pubkey); | |
699 | p = ASN1_STRING_data(pubkey); | |
700 | if (!p || !plen) | |
701 | goto err; | |
702 | ||
703 | if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, plen))) | |
704 | { | |
705 | DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_DECODE_ERROR); | |
706 | goto err; | |
707 | } | |
708 | ||
709 | /* We have parameters now set public key */ | |
710 | if (!(dhpeer->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) | |
711 | { | |
712 | DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_BN_DECODE_ERROR); | |
713 | goto err; | |
714 | } | |
715 | ||
716 | pkpeer = EVP_PKEY_new(); | |
717 | if (!pkpeer) | |
718 | goto err; | |
719 | EVP_PKEY_assign(pkpeer, pk->ameth->pkey_id, dhpeer); | |
720 | dhpeer = NULL; | |
721 | if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0) | |
722 | rv = 1; | |
723 | err: | |
724 | if (public_key) | |
725 | ASN1_INTEGER_free(public_key); | |
726 | if (pkpeer) | |
727 | EVP_PKEY_free(pkpeer); | |
728 | if (dhpeer) | |
729 | DH_free(dhpeer); | |
730 | return rv; | |
731 | } | |
732 | ||
733 | static int dh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri) | |
734 | { | |
735 | int rv = 0; | |
736 | ||
737 | X509_ALGOR *alg, *kekalg = NULL; | |
738 | ASN1_OCTET_STRING *ukm; | |
739 | const unsigned char *p; | |
740 | unsigned char *dukm = NULL; | |
741 | size_t dukmlen = 0; | |
742 | int keylen, plen; | |
743 | const EVP_CIPHER *kekcipher; | |
744 | EVP_CIPHER_CTX *kekctx; | |
745 | ||
746 | if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm)) | |
747 | goto err; | |
748 | ||
749 | /* For DH we only have one OID permissible. If ever any more get | |
750 | * defined we will need something cleverer. | |
751 | */ | |
752 | if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH) | |
753 | { | |
754 | DHerr(DH_F_DH_CMS_SET_SHARED_INFO, DH_R_KDF_PARAMETER_ERROR); | |
755 | goto err; | |
756 | } | |
757 | ||
758 | if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0) | |
759 | goto err; | |
760 | ||
761 | if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0) | |
762 | goto err; | |
763 | ||
764 | if (alg->parameter->type != V_ASN1_SEQUENCE) | |
765 | goto err; | |
766 | ||
767 | p = alg->parameter->value.sequence->data; | |
768 | plen = alg->parameter->value.sequence->length; | |
769 | kekalg = d2i_X509_ALGOR(NULL, &p, plen); | |
770 | if (!kekalg) | |
771 | goto err; | |
772 | kekctx = CMS_RecipientInfo_kari_get0_ctx(ri); | |
773 | if (!kekctx) | |
774 | goto err; | |
775 | kekcipher = EVP_get_cipherbyobj(kekalg->algorithm); | |
776 | if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE) | |
777 | goto err; | |
778 | if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL)) | |
779 | goto err; | |
780 | if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0) | |
781 | goto err; | |
782 | ||
783 | keylen = EVP_CIPHER_CTX_key_length(kekctx); | |
784 | if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0) | |
785 | goto err; | |
786 | /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */ | |
787 | if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, | |
788 | OBJ_nid2obj(EVP_CIPHER_type(kekcipher))) <= 0) | |
789 | goto err; | |
790 | ||
791 | if (ukm) | |
792 | { | |
793 | dukmlen = ASN1_STRING_length(ukm); | |
794 | dukm = BUF_memdup(ASN1_STRING_data(ukm), dukmlen); | |
795 | if (!dukm) | |
796 | goto err; | |
797 | } | |
798 | ||
799 | if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0) | |
800 | goto err; | |
801 | dukm = NULL; | |
802 | ||
803 | rv = 1; | |
804 | err: | |
805 | if (kekalg) | |
806 | X509_ALGOR_free(kekalg); | |
807 | if (dukm) | |
808 | OPENSSL_free(dukm); | |
809 | return rv; | |
810 | } | |
811 | ||
812 | static int dh_cms_decrypt(CMS_RecipientInfo *ri) | |
813 | { | |
814 | EVP_PKEY_CTX *pctx; | |
815 | pctx = CMS_RecipientInfo_get0_pkey_ctx(ri); | |
816 | if (!pctx) | |
817 | return 0; | |
818 | /* See if we need to set peer key */ | |
819 | if (!EVP_PKEY_CTX_get0_peerkey(pctx)) | |
820 | { | |
821 | X509_ALGOR *alg; | |
822 | ASN1_BIT_STRING *pubkey; | |
823 | if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey, | |
824 | NULL, NULL, NULL)) | |
825 | return 0; | |
826 | if (!alg || !pubkey) | |
827 | return 0; | |
828 | if (!dh_cms_set_peerkey(pctx, alg, pubkey)) | |
829 | { | |
830 | DHerr(DH_F_DH_CMS_DECRYPT, DH_R_PEER_KEY_ERROR); | |
831 | return 0; | |
832 | } | |
833 | } | |
834 | /* Set DH derivation parameters and initialise unwrap context */ | |
835 | if (!dh_cms_set_shared_info(pctx, ri)) | |
836 | { | |
837 | DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR); | |
838 | return 0; | |
839 | } | |
840 | return 1; | |
841 | } | |
842 | ||
843 | static int dh_cms_encrypt(CMS_RecipientInfo *ri) | |
844 | { | |
845 | EVP_PKEY_CTX *pctx; | |
846 | EVP_PKEY *pkey; | |
847 | EVP_CIPHER_CTX *ctx; | |
848 | int keylen; | |
849 | X509_ALGOR *talg, *wrap_alg = NULL; | |
850 | ASN1_OBJECT *aoid; | |
851 | ASN1_BIT_STRING *pubkey; | |
852 | ASN1_STRING *wrap_str; | |
853 | ASN1_OCTET_STRING *ukm; | |
854 | unsigned char *penc = NULL, *dukm = NULL; | |
855 | int penclen; | |
856 | size_t dukmlen = 0; | |
857 | int rv = 0; | |
858 | int kdf_type, wrap_nid; | |
859 | const EVP_MD *kdf_md; | |
860 | pctx = CMS_RecipientInfo_get0_pkey_ctx(ri); | |
861 | if (!pctx) | |
862 | return 0; | |
863 | /* Get ephemeral key */ | |
864 | pkey = EVP_PKEY_CTX_get0_pkey(pctx); | |
865 | if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey, | |
866 | NULL, NULL, NULL)) | |
867 | goto err; | |
868 | X509_ALGOR_get0(&aoid, NULL, NULL, talg); | |
869 | /* Is everything uninitialised? */ | |
870 | if (aoid == OBJ_nid2obj(NID_undef)) | |
871 | { | |
872 | ASN1_INTEGER *pubk; | |
873 | pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL); | |
874 | if (!pubk) | |
875 | goto err; | |
876 | /* Set the key */ | |
877 | ||
878 | penclen = i2d_ASN1_INTEGER(pubk, &penc); | |
879 | ASN1_INTEGER_free(pubk); | |
880 | if (penclen <= 0) | |
881 | goto err; | |
882 | ASN1_STRING_set0(pubkey, penc, penclen); | |
883 | pubkey->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); | |
884 | pubkey->flags|=ASN1_STRING_FLAG_BITS_LEFT; | |
885 | ||
886 | penc = NULL; | |
887 | X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber), | |
888 | V_ASN1_UNDEF, NULL); | |
889 | } | |
890 | ||
891 | /* See if custom paraneters set */ | |
892 | kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx); | |
893 | if (kdf_type <= 0) | |
894 | goto err; | |
895 | if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md)) | |
896 | goto err; | |
897 | ||
898 | if (kdf_type == EVP_PKEY_DH_KDF_NONE) | |
899 | { | |
900 | kdf_type = EVP_PKEY_DH_KDF_X9_42; | |
901 | if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0) | |
902 | goto err; | |
903 | } | |
904 | else if (kdf_type != EVP_PKEY_DH_KDF_X9_42) | |
905 | /* Unknown KDF */ | |
906 | goto err; | |
907 | if (kdf_md == NULL) | |
908 | { | |
909 | /* Only SHA1 supported */ | |
910 | kdf_md = EVP_sha1(); | |
911 | if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0) | |
912 | goto err; | |
913 | } | |
914 | else if (EVP_MD_type(kdf_md) != NID_sha1) | |
915 | /* Unsupported digest */ | |
916 | goto err; | |
917 | ||
918 | if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm)) | |
919 | goto err; | |
920 | ||
921 | /* Get wrap NID */ | |
922 | ctx = CMS_RecipientInfo_kari_get0_ctx(ri); | |
923 | wrap_nid = EVP_CIPHER_CTX_type(ctx); | |
924 | if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0) | |
925 | goto err; | |
926 | keylen = EVP_CIPHER_CTX_key_length(ctx); | |
927 | ||
928 | /* Package wrap algorithm in an AlgorithmIdentifier */ | |
929 | ||
930 | wrap_alg = X509_ALGOR_new(); | |
931 | if (!wrap_alg) | |
932 | goto err; | |
933 | wrap_alg->algorithm = OBJ_nid2obj(wrap_nid); | |
934 | wrap_alg->parameter = ASN1_TYPE_new(); | |
935 | if (!wrap_alg->parameter) | |
936 | goto err; | |
937 | if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0) | |
938 | goto err; | |
939 | if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) | |
940 | { | |
941 | ASN1_TYPE_free(wrap_alg->parameter); | |
942 | wrap_alg->parameter = NULL; | |
943 | } | |
944 | ||
945 | if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0) | |
946 | goto err; | |
947 | ||
948 | if (ukm) | |
949 | { | |
950 | dukmlen = ASN1_STRING_length(ukm); | |
951 | dukm = BUF_memdup(ASN1_STRING_data(ukm), dukmlen); | |
952 | if (!dukm) | |
953 | goto err; | |
954 | } | |
955 | ||
956 | if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0) | |
957 | goto err; | |
958 | dukm = NULL; | |
959 | ||
960 | /* Now need to wrap encoding of wrap AlgorithmIdentifier into | |
961 | * parameter of another AlgorithmIdentifier. | |
962 | */ | |
963 | penc = NULL; | |
964 | penclen = i2d_X509_ALGOR(wrap_alg, &penc); | |
965 | if (!penc || !penclen) | |
966 | goto err; | |
967 | wrap_str = ASN1_STRING_new(); | |
968 | if (!wrap_str) | |
969 | goto err; | |
970 | ASN1_STRING_set0(wrap_str, penc, penclen); | |
971 | penc = NULL; | |
972 | X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH), | |
973 | V_ASN1_SEQUENCE, wrap_str); | |
974 | ||
975 | rv = 1; | |
976 | ||
977 | err: | |
978 | if (penc) | |
979 | OPENSSL_free(penc); | |
980 | if (wrap_alg) | |
981 | X509_ALGOR_free(wrap_alg); | |
982 | return rv; | |
983 | } | |
984 | ||
985 | #endif | |
986 |