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openssl update: 1.0.1h
[tomato.git] / release / src / router / openssl / crypto / ec / ec_ameth.c
blobf715a238a6fc1a68eb80fe4115270d5b06d9ac48
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/ec.h>
62 #include <openssl/bn.h>
63 #ifndef OPENSSL_NO_CMS
64 #include <openssl/cms.h>
65 #endif
66 #include "asn1_locl.h"
67
68 static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
69 {
70 const EC_GROUP *group;
71 int nid;
72 if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL)
73 {
74 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
75 return 0;
76 }
77 if (EC_GROUP_get_asn1_flag(group)
78 && (nid = EC_GROUP_get_curve_name(group)))
79 /* we have a 'named curve' => just set the OID */
80 {
81 *ppval = OBJ_nid2obj(nid);
82 *pptype = V_ASN1_OBJECT;
83 }
84 else /* explicit parameters */
85 {
86 ASN1_STRING *pstr = NULL;
87 pstr = ASN1_STRING_new();
88 if (!pstr)
89 return 0;
90 pstr->length = i2d_ECParameters(ec_key, &pstr->data);
91 if (pstr->length <= 0)
92 {
93 ASN1_STRING_free(pstr);
94 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
95 return 0;
96 }
97 *ppval = pstr;
98 *pptype = V_ASN1_SEQUENCE;
99 }
100 return 1;
101 }
102
103 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
104 {
105 EC_KEY *ec_key = pkey->pkey.ec;
106 void *pval = NULL;
107 int ptype;
108 unsigned char *penc = NULL, *p;
109 int penclen;
110
111 if (!eckey_param2type(&ptype, &pval, ec_key))
112 {
113 ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
114 return 0;
115 }
116 penclen = i2o_ECPublicKey(ec_key, NULL);
117 if (penclen <= 0)
118 goto err;
119 penc = OPENSSL_malloc(penclen);
120 if (!penc)
121 goto err;
122 p = penc;
123 penclen = i2o_ECPublicKey(ec_key, &p);
124 if (penclen <= 0)
125 goto err;
126 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
127 ptype, pval, penc, penclen))
128 return 1;
129 err:
130 if (ptype == V_ASN1_OBJECT)
131 ASN1_OBJECT_free(pval);
132 else
133 ASN1_STRING_free(pval);
134 if (penc)
135 OPENSSL_free(penc);
136 return 0;
137 }
138
139 static EC_KEY *eckey_type2param(int ptype, void *pval)
140 {
141 EC_KEY *eckey = NULL;
142 if (ptype == V_ASN1_SEQUENCE)
143 {
144 ASN1_STRING *pstr = pval;
145 const unsigned char *pm = NULL;
146 int pmlen;
147 pm = pstr->data;
148 pmlen = pstr->length;
149 if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen)))
150 {
151 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
152 goto ecerr;
153 }
154 }
155 else if (ptype == V_ASN1_OBJECT)
156 {
157 ASN1_OBJECT *poid = pval;
158 EC_GROUP *group;
159
160 /* type == V_ASN1_OBJECT => the parameters are given
161 * by an asn1 OID
162 */
163 if ((eckey = EC_KEY_new()) == NULL)
164 {
165 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
166 goto ecerr;
167 }
168 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
169 if (group == NULL)
170 goto ecerr;
171 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
172 if (EC_KEY_set_group(eckey, group) == 0)
173 goto ecerr;
174 EC_GROUP_free(group);
175 }
176 else
177 {
178 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
179 goto ecerr;
180 }
181
182 return eckey;
183
184 ecerr:
185 if (eckey)
186 EC_KEY_free(eckey);
187 return NULL;
188 }
189
190 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
191 {
192 const unsigned char *p = NULL;
193 void *pval;
194 int ptype, pklen;
195 EC_KEY *eckey = NULL;
196 X509_ALGOR *palg;
197
198 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
199 return 0;
200 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
201
202 eckey = eckey_type2param(ptype, pval);
203
204 if (!eckey)
205 {
206 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
207 return 0;
208 }
209
210 /* We have parameters now set public key */
211 if (!o2i_ECPublicKey(&eckey, &p, pklen))
212 {
213 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
214 goto ecerr;
215 }
216
217 EVP_PKEY_assign_EC_KEY(pkey, eckey);
218 return 1;
219
220 ecerr:
221 if (eckey)
222 EC_KEY_free(eckey);
223 return 0;
224 }
225
226 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
227 {
228 int r;
229 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
230 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
231 *pb = EC_KEY_get0_public_key(b->pkey.ec);
232 r = EC_POINT_cmp(group, pa, pb, NULL);
233 if (r == 0)
234 return 1;
235 if (r == 1)
236 return 0;
237 return -2;
238 }
239
240 static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
241 {
242 const unsigned char *p = NULL;
243 void *pval;
244 int ptype, pklen;
245 EC_KEY *eckey = NULL;
246 X509_ALGOR *palg;
247
248 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
249 return 0;
250 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
251
252 eckey = eckey_type2param(ptype, pval);
253
254 if (!eckey)
255 goto ecliberr;
256
257 /* We have parameters now set private key */
258 if (!d2i_ECPrivateKey(&eckey, &p, pklen))
259 {
260 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
261 goto ecerr;
262 }
263
264 /* calculate public key (if necessary) */
265 if (EC_KEY_get0_public_key(eckey) == NULL)
266 {
267 const BIGNUM *priv_key;
268 const EC_GROUP *group;
269 EC_POINT *pub_key;
270 /* the public key was not included in the SEC1 private
271 * key => calculate the public key */
272 group = EC_KEY_get0_group(eckey);
273 pub_key = EC_POINT_new(group);
274 if (pub_key == NULL)
275 {
276 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
277 goto ecliberr;
278 }
279 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group)))
280 {
281 EC_POINT_free(pub_key);
282 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
283 goto ecliberr;
284 }
285 priv_key = EC_KEY_get0_private_key(eckey);
286 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL))
287 {
288 EC_POINT_free(pub_key);
289 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
290 goto ecliberr;
291 }
292 if (EC_KEY_set_public_key(eckey, pub_key) == 0)
293 {
294 EC_POINT_free(pub_key);
295 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
296 goto ecliberr;
297 }
298 EC_POINT_free(pub_key);
299 }
300
301 EVP_PKEY_assign_EC_KEY(pkey, eckey);
302 return 1;
303
304 ecliberr:
305 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
306 ecerr:
307 if (eckey)
308 EC_KEY_free(eckey);
309 return 0;
310 }
311
312 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
313 {
314 EC_KEY *ec_key;
315 unsigned char *ep, *p;
316 int eplen, ptype;
317 void *pval;
318 unsigned int tmp_flags, old_flags;
319
320 ec_key = pkey->pkey.ec;
321
322 if (!eckey_param2type(&ptype, &pval, ec_key))
323 {
324 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
325 return 0;
326 }
327
328 /* set the private key */
329
330 /* do not include the parameters in the SEC1 private key
331 * see PKCS#11 12.11 */
332 old_flags = EC_KEY_get_enc_flags(ec_key);
333 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
334 EC_KEY_set_enc_flags(ec_key, tmp_flags);
335 eplen = i2d_ECPrivateKey(ec_key, NULL);
336 if (!eplen)
337 {
338 EC_KEY_set_enc_flags(ec_key, old_flags);
339 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
340 return 0;
341 }
342 ep = (unsigned char *) OPENSSL_malloc(eplen);
343 if (!ep)
344 {
345 EC_KEY_set_enc_flags(ec_key, old_flags);
346 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
347 return 0;
348 }
349 p = ep;
350 if (!i2d_ECPrivateKey(ec_key, &p))
351 {
352 EC_KEY_set_enc_flags(ec_key, old_flags);
353 OPENSSL_free(ep);
354 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
355 return 0;
356 }
357 /* restore old encoding flags */
358 EC_KEY_set_enc_flags(ec_key, old_flags);
359
360 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
361 ptype, pval, ep, eplen))
362 return 0;
363
364 return 1;
365 }
366
367 static int int_ec_size(const EVP_PKEY *pkey)
368 {
369 return ECDSA_size(pkey->pkey.ec);
370 }
371
372 static int ec_bits(const EVP_PKEY *pkey)
373 {
374 BIGNUM *order = BN_new();
375 const EC_GROUP *group;
376 int ret;
377
378 if (!order)
379 {
380 ERR_clear_error();
381 return 0;
382 }
383 group = EC_KEY_get0_group(pkey->pkey.ec);
384 if (!EC_GROUP_get_order(group, order, NULL))
385 {
386 ERR_clear_error();
387 return 0;
388 }
389
390 ret = BN_num_bits(order);
391 BN_free(order);
392 return ret;
393 }
394
395 static int ec_missing_parameters(const EVP_PKEY *pkey)
396 {
397 if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
398 return 1;
399 return 0;
400 }
401
402 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
403 {
404 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
405 if (group == NULL)
406 return 0;
407 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
408 return 0;
409 EC_GROUP_free(group);
410 return 1;
411 }
412
413 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
414 {
415 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
416 *group_b = EC_KEY_get0_group(b->pkey.ec);
417 if (EC_GROUP_cmp(group_a, group_b, NULL))
418 return 0;
419 else
420 return 1;
421 }
422
423 static void int_ec_free(EVP_PKEY *pkey)
424 {
425 EC_KEY_free(pkey->pkey.ec);
426 }
427
428 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype)
429 {
430 unsigned char *buffer=NULL;
431 const char *ecstr;
432 size_t buf_len=0, i;
433 int ret=0, reason=ERR_R_BIO_LIB;
434 BIGNUM *pub_key=NULL, *order=NULL;
435 BN_CTX *ctx=NULL;
436 const EC_GROUP *group;
437 const EC_POINT *public_key;
438 const BIGNUM *priv_key;
439
440 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL)
441 {
442 reason = ERR_R_PASSED_NULL_PARAMETER;
443 goto err;
444 }
445
446 ctx = BN_CTX_new();
447 if (ctx == NULL)
448 {
449 reason = ERR_R_MALLOC_FAILURE;
450 goto err;
451 }
452
453 if (ktype > 0)
454 {
455 public_key = EC_KEY_get0_public_key(x);
456 if ((pub_key = EC_POINT_point2bn(group, public_key,
457 EC_KEY_get_conv_form(x), NULL, ctx)) == NULL)
458 {
459 reason = ERR_R_EC_LIB;
460 goto err;
461 }
462 if (pub_key)
463 buf_len = (size_t)BN_num_bytes(pub_key);
464 }
465
466 if (ktype == 2)
467 {
468 priv_key = EC_KEY_get0_private_key(x);
469 if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
470 buf_len = i;
471 }
472 else
473 priv_key = NULL;
474
475 if (ktype > 0)
476 {
477 buf_len += 10;
478 if ((buffer = OPENSSL_malloc(buf_len)) == NULL)
479 {
480 reason = ERR_R_MALLOC_FAILURE;
481 goto err;
482 }
483 }
484 if (ktype == 2)
485 ecstr = "Private-Key";
486 else if (ktype == 1)
487 ecstr = "Public-Key";
488 else
489 ecstr = "ECDSA-Parameters";
490
491 if (!BIO_indent(bp, off, 128))
492 goto err;
493 if ((order = BN_new()) == NULL)
494 goto err;
495 if (!EC_GROUP_get_order(group, order, NULL))
496 goto err;
497 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
498 BN_num_bits(order)) <= 0) goto err;
499
500 if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
501 buffer, off))
502 goto err;
503 if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
504 buffer, off))
505 goto err;
506 if (!ECPKParameters_print(bp, group, off))
507 goto err;
508 ret=1;
509 err:
510 if (!ret)
511 ECerr(EC_F_DO_EC_KEY_PRINT, reason);
512 if (pub_key)
513 BN_free(pub_key);
514 if (order)
515 BN_free(order);
516 if (ctx)
517 BN_CTX_free(ctx);
518 if (buffer != NULL)
519 OPENSSL_free(buffer);
520 return(ret);
521 }
522
523 static int eckey_param_decode(EVP_PKEY *pkey,
524 const unsigned char **pder, int derlen)
525 {
526 EC_KEY *eckey;
527 if (!(eckey = d2i_ECParameters(NULL, pder, derlen)))
528 {
529 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
530 return 0;
531 }
532 EVP_PKEY_assign_EC_KEY(pkey, eckey);
533 return 1;
534 }
535
536 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
537 {
538 return i2d_ECParameters(pkey->pkey.ec, pder);
539 }
540
541 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
542 ASN1_PCTX *ctx)
543 {
544 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
545 }
546
547 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
548 ASN1_PCTX *ctx)
549 {
550 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
551 }
552
553
554 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
555 ASN1_PCTX *ctx)
556 {
557 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
558 }
559
560 static int old_ec_priv_decode(EVP_PKEY *pkey,
561 const unsigned char **pder, int derlen)
562 {
563 EC_KEY *ec;
564 if (!(ec = d2i_ECPrivateKey (NULL, pder, derlen)))
565 {
566 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
567 return 0;
568 }
569 EVP_PKEY_assign_EC_KEY(pkey, ec);
570 return 1;
571 }
572
573 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
574 {
575 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
576 }
577
578 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
579 {
580 switch (op)
581 {
582 case ASN1_PKEY_CTRL_PKCS7_SIGN:
583 if (arg1 == 0)
584 {
585 int snid, hnid;
586 X509_ALGOR *alg1, *alg2;
587 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
588 if (alg1 == NULL || alg1->algorithm == NULL)
589 return -1;
590 hnid = OBJ_obj2nid(alg1->algorithm);
591 if (hnid == NID_undef)
592 return -1;
593 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
594 return -1;
595 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
596 }
597 return 1;
598 #ifndef OPENSSL_NO_CMS
599 case ASN1_PKEY_CTRL_CMS_SIGN:
600 if (arg1 == 0)
601 {
602 int snid, hnid;
603 X509_ALGOR *alg1, *alg2;
604 CMS_SignerInfo_get0_algs(arg2, NULL, NULL,
605 &alg1, &alg2);
606 if (alg1 == NULL || alg1->algorithm == NULL)
607 return -1;
608 hnid = OBJ_obj2nid(alg1->algorithm);
609 if (hnid == NID_undef)
610 return -1;
611 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
612 return -1;
613 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
614 }
615 return 1;
616 #endif
617
618 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
619 *(int *)arg2 = NID_sha1;
620 return 2;
621
622 default:
623 return -2;
624
625 }
626
627 }
628
629 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth =
630 {
631 EVP_PKEY_EC,
632 EVP_PKEY_EC,
633 0,
634 "EC",
635 "OpenSSL EC algorithm",
636
637 eckey_pub_decode,
638 eckey_pub_encode,
639 eckey_pub_cmp,
640 eckey_pub_print,
641
642 eckey_priv_decode,
643 eckey_priv_encode,
644 eckey_priv_print,
645
646 int_ec_size,
647 ec_bits,
648
649 eckey_param_decode,
650 eckey_param_encode,
651 ec_missing_parameters,
652 ec_copy_parameters,
653 ec_cmp_parameters,
654 eckey_param_print,
655 0,
656
657 int_ec_free,
658 ec_pkey_ctrl,
659 old_ec_priv_decode,
660 old_ec_priv_encode
661 };
Tomato firmware and modifications.