1 /*
2 * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/x509.h>
13 #include <openssl/ec.h>
14 #include <openssl/bn.h>
15 #include <openssl/cms.h>
16 #include <openssl/asn1t.h>
17 #include "crypto/asn1.h"
18 #include "crypto/evp.h"
19 #include "ec_local.h"
20
21 #ifndef OPENSSL_NO_CMS
22 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
23 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
24 #endif
25
eckey_param2type(int * pptype,void ** ppval,const EC_KEY * ec_key)26 static int eckey_param2type(int *pptype, void **ppval, const EC_KEY *ec_key)
27 {
28 const EC_GROUP *group;
29 int nid;
30 if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
31 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
32 return 0;
33 }
34 if (EC_GROUP_get_asn1_flag(group)
35 && (nid = EC_GROUP_get_curve_name(group)))
36 /* we have a 'named curve' => just set the OID */
37 {
38 ASN1_OBJECT *asn1obj = OBJ_nid2obj(nid);
39
40 if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
41 ASN1_OBJECT_free(asn1obj);
42 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_OID);
43 return 0;
44 }
45 *ppval = asn1obj;
46 *pptype = V_ASN1_OBJECT;
47 } else { /* explicit parameters */
48
49 ASN1_STRING *pstr = NULL;
50 pstr = ASN1_STRING_new();
51 if (pstr == NULL)
52 return 0;
53
54 /*
55 * The cast in the following line is intentional as the
56 * `i2d_ECParameters` signature can't be constified (see discussion at
57 * https://github.com/openssl/openssl/pull/9347 where related and
58 * required constification backports were rejected).
59 *
60 * This cast should be safe anyway, because we can expect
61 * `i2d_ECParameters()` to treat the first argument as if it was const.
62 */
63 pstr->length = i2d_ECParameters((EC_KEY *)ec_key, &pstr->data);
64 if (pstr->length <= 0) {
65 ASN1_STRING_free(pstr);
66 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
67 return 0;
68 }
69 *ppval = pstr;
70 *pptype = V_ASN1_SEQUENCE;
71 }
72 return 1;
73 }
74
eckey_pub_encode(X509_PUBKEY * pk,const EVP_PKEY * pkey)75 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
76 {
77 const EC_KEY *ec_key = pkey->pkey.ec;
78 void *pval = NULL;
79 int ptype;
80 unsigned char *penc = NULL, *p;
81 int penclen;
82
83 if (!eckey_param2type(&ptype, &pval, ec_key)) {
84 ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
85 return 0;
86 }
87 penclen = i2o_ECPublicKey(ec_key, NULL);
88 if (penclen <= 0)
89 goto err;
90 penc = OPENSSL_malloc(penclen);
91 if (penc == NULL)
92 goto err;
93 p = penc;
94 penclen = i2o_ECPublicKey(ec_key, &p);
95 if (penclen <= 0)
96 goto err;
97 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
98 ptype, pval, penc, penclen))
99 return 1;
100 err:
101 if (ptype == V_ASN1_OBJECT)
102 ASN1_OBJECT_free(pval);
103 else
104 ASN1_STRING_free(pval);
105 OPENSSL_free(penc);
106 return 0;
107 }
108
eckey_type2param(int ptype,const void * pval)109 static EC_KEY *eckey_type2param(int ptype, const void *pval)
110 {
111 EC_KEY *eckey = NULL;
112 EC_GROUP *group = NULL;
113
114 if (ptype == V_ASN1_SEQUENCE) {
115 const ASN1_STRING *pstr = pval;
116 const unsigned char *pm = pstr->data;
117 int pmlen = pstr->length;
118
119 if ((eckey = d2i_ECParameters(NULL, &pm, pmlen)) == NULL) {
120 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
121 goto ecerr;
122 }
123 } else if (ptype == V_ASN1_OBJECT) {
124 const ASN1_OBJECT *poid = pval;
125
126 /*
127 * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
128 */
129 if ((eckey = EC_KEY_new()) == NULL) {
130 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
131 goto ecerr;
132 }
133 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
134 if (group == NULL)
135 goto ecerr;
136 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
137 if (EC_KEY_set_group(eckey, group) == 0)
138 goto ecerr;
139 EC_GROUP_free(group);
140 } else {
141 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
142 goto ecerr;
143 }
144
145 return eckey;
146
147 ecerr:
148 EC_KEY_free(eckey);
149 EC_GROUP_free(group);
150 return NULL;
151 }
152
eckey_pub_decode(EVP_PKEY * pkey,X509_PUBKEY * pubkey)153 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
154 {
155 const unsigned char *p = NULL;
156 const void *pval;
157 int ptype, pklen;
158 EC_KEY *eckey = NULL;
159 X509_ALGOR *palg;
160
161 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
162 return 0;
163 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
164
165 eckey = eckey_type2param(ptype, pval);
166
167 if (!eckey) {
168 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
169 return 0;
170 }
171
172 /* We have parameters now set public key */
173 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
174 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
175 goto ecerr;
176 }
177
178 EVP_PKEY_assign_EC_KEY(pkey, eckey);
179 return 1;
180
181 ecerr:
182 EC_KEY_free(eckey);
183 return 0;
184 }
185
eckey_pub_cmp(const EVP_PKEY * a,const EVP_PKEY * b)186 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
187 {
188 int r;
189 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
190 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
191 *pb = EC_KEY_get0_public_key(b->pkey.ec);
192 if (group == NULL || pa == NULL || pb == NULL)
193 return -2;
194 r = EC_POINT_cmp(group, pa, pb, NULL);
195 if (r == 0)
196 return 1;
197 if (r == 1)
198 return 0;
199 return -2;
200 }
201
eckey_priv_decode(EVP_PKEY * pkey,const PKCS8_PRIV_KEY_INFO * p8)202 static int eckey_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
203 {
204 const unsigned char *p = NULL;
205 const void *pval;
206 int ptype, pklen;
207 EC_KEY *eckey = NULL;
208 const X509_ALGOR *palg;
209
210 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
211 return 0;
212 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
213
214 eckey = eckey_type2param(ptype, pval);
215
216 if (!eckey)
217 goto ecliberr;
218
219 /* We have parameters now set private key */
220 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
221 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
222 goto ecerr;
223 }
224
225 EVP_PKEY_assign_EC_KEY(pkey, eckey);
226 return 1;
227
228 ecliberr:
229 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
230 ecerr:
231 EC_KEY_free(eckey);
232 return 0;
233 }
234
eckey_priv_encode(PKCS8_PRIV_KEY_INFO * p8,const EVP_PKEY * pkey)235 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
236 {
237 EC_KEY ec_key = *(pkey->pkey.ec);
238 unsigned char *ep, *p;
239 int eplen, ptype;
240 void *pval;
241 unsigned int old_flags;
242
243 if (!eckey_param2type(&ptype, &pval, &ec_key)) {
244 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
245 return 0;
246 }
247
248 /* set the private key */
249
250 /*
251 * do not include the parameters in the SEC1 private key see PKCS#11
252 * 12.11
253 */
254 old_flags = EC_KEY_get_enc_flags(&ec_key);
255 EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS);
256
257 eplen = i2d_ECPrivateKey(&ec_key, NULL);
258 if (!eplen) {
259 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
260 return 0;
261 }
262 ep = OPENSSL_malloc(eplen);
263 if (ep == NULL) {
264 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
265 return 0;
266 }
267 p = ep;
268 if (!i2d_ECPrivateKey(&ec_key, &p)) {
269 OPENSSL_free(ep);
270 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
271 return 0;
272 }
273
274 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
275 ptype, pval, ep, eplen)) {
276 OPENSSL_free(ep);
277 return 0;
278 }
279
280 return 1;
281 }
282
int_ec_size(const EVP_PKEY * pkey)283 static int int_ec_size(const EVP_PKEY *pkey)
284 {
285 return ECDSA_size(pkey->pkey.ec);
286 }
287
ec_bits(const EVP_PKEY * pkey)288 static int ec_bits(const EVP_PKEY *pkey)
289 {
290 return EC_GROUP_order_bits(EC_KEY_get0_group(pkey->pkey.ec));
291 }
292
ec_security_bits(const EVP_PKEY * pkey)293 static int ec_security_bits(const EVP_PKEY *pkey)
294 {
295 int ecbits = ec_bits(pkey);
296 if (ecbits >= 512)
297 return 256;
298 if (ecbits >= 384)
299 return 192;
300 if (ecbits >= 256)
301 return 128;
302 if (ecbits >= 224)
303 return 112;
304 if (ecbits >= 160)
305 return 80;
306 return ecbits / 2;
307 }
308
ec_missing_parameters(const EVP_PKEY * pkey)309 static int ec_missing_parameters(const EVP_PKEY *pkey)
310 {
311 if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL)
312 return 1;
313 return 0;
314 }
315
ec_copy_parameters(EVP_PKEY * to,const EVP_PKEY * from)316 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
317 {
318 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
319
320 if (group == NULL)
321 return 0;
322 if (to->pkey.ec == NULL) {
323 to->pkey.ec = EC_KEY_new();
324 if (to->pkey.ec == NULL)
325 goto err;
326 }
327 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
328 goto err;
329 EC_GROUP_free(group);
330 return 1;
331 err:
332 EC_GROUP_free(group);
333 return 0;
334 }
335
ec_cmp_parameters(const EVP_PKEY * a,const EVP_PKEY * b)336 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
337 {
338 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
339 *group_b = EC_KEY_get0_group(b->pkey.ec);
340 if (group_a == NULL || group_b == NULL)
341 return -2;
342 if (EC_GROUP_cmp(group_a, group_b, NULL))
343 return 0;
344 else
345 return 1;
346 }
347
int_ec_free(EVP_PKEY * pkey)348 static void int_ec_free(EVP_PKEY *pkey)
349 {
350 EC_KEY_free(pkey->pkey.ec);
351 }
352
353 typedef enum {
354 EC_KEY_PRINT_PRIVATE,
355 EC_KEY_PRINT_PUBLIC,
356 EC_KEY_PRINT_PARAM
357 } ec_print_t;
358
do_EC_KEY_print(BIO * bp,const EC_KEY * x,int off,ec_print_t ktype)359 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, ec_print_t ktype)
360 {
361 const char *ecstr;
362 unsigned char *priv = NULL, *pub = NULL;
363 size_t privlen = 0, publen = 0;
364 int ret = 0;
365 const EC_GROUP *group;
366
367 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
368 ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_PASSED_NULL_PARAMETER);
369 return 0;
370 }
371
372 if (ktype != EC_KEY_PRINT_PARAM && EC_KEY_get0_public_key(x) != NULL) {
373 publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
374 if (publen == 0)
375 goto err;
376 }
377
378 if (ktype == EC_KEY_PRINT_PRIVATE && EC_KEY_get0_private_key(x) != NULL) {
379 privlen = EC_KEY_priv2buf(x, &priv);
380 if (privlen == 0)
381 goto err;
382 }
383
384 if (ktype == EC_KEY_PRINT_PRIVATE)
385 ecstr = "Private-Key";
386 else if (ktype == EC_KEY_PRINT_PUBLIC)
387 ecstr = "Public-Key";
388 else
389 ecstr = "ECDSA-Parameters";
390
391 if (!BIO_indent(bp, off, 128))
392 goto err;
393 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
394 EC_GROUP_order_bits(group)) <= 0)
395 goto err;
396
397 if (privlen != 0) {
398 if (BIO_printf(bp, "%*spriv:\n", off, "") <= 0)
399 goto err;
400 if (ASN1_buf_print(bp, priv, privlen, off + 4) == 0)
401 goto err;
402 }
403
404 if (publen != 0) {
405 if (BIO_printf(bp, "%*spub:\n", off, "") <= 0)
406 goto err;
407 if (ASN1_buf_print(bp, pub, publen, off + 4) == 0)
408 goto err;
409 }
410
411 if (!ECPKParameters_print(bp, group, off))
412 goto err;
413 ret = 1;
414 err:
415 if (!ret)
416 ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_EC_LIB);
417 OPENSSL_clear_free(priv, privlen);
418 OPENSSL_free(pub);
419 return ret;
420 }
421
eckey_param_decode(EVP_PKEY * pkey,const unsigned char ** pder,int derlen)422 static int eckey_param_decode(EVP_PKEY *pkey,
423 const unsigned char **pder, int derlen)
424 {
425 EC_KEY *eckey;
426
427 if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL) {
428 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
429 return 0;
430 }
431 EVP_PKEY_assign_EC_KEY(pkey, eckey);
432 return 1;
433 }
434
eckey_param_encode(const EVP_PKEY * pkey,unsigned char ** pder)435 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
436 {
437 return i2d_ECParameters(pkey->pkey.ec, pder);
438 }
439
eckey_param_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)440 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
441 ASN1_PCTX *ctx)
442 {
443 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PARAM);
444 }
445
eckey_pub_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)446 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
447 ASN1_PCTX *ctx)
448 {
449 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PUBLIC);
450 }
451
eckey_priv_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)452 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
453 ASN1_PCTX *ctx)
454 {
455 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PRIVATE);
456 }
457
old_ec_priv_decode(EVP_PKEY * pkey,const unsigned char ** pder,int derlen)458 static int old_ec_priv_decode(EVP_PKEY *pkey,
459 const unsigned char **pder, int derlen)
460 {
461 EC_KEY *ec;
462
463 if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL) {
464 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
465 return 0;
466 }
467 EVP_PKEY_assign_EC_KEY(pkey, ec);
468 return 1;
469 }
470
old_ec_priv_encode(const EVP_PKEY * pkey,unsigned char ** pder)471 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
472 {
473 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
474 }
475
ec_pkey_ctrl(EVP_PKEY * pkey,int op,long arg1,void * arg2)476 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
477 {
478 switch (op) {
479 case ASN1_PKEY_CTRL_PKCS7_SIGN:
480 if (arg1 == 0) {
481 int snid, hnid;
482 X509_ALGOR *alg1, *alg2;
483 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
484 if (alg1 == NULL || alg1->algorithm == NULL)
485 return -1;
486 hnid = OBJ_obj2nid(alg1->algorithm);
487 if (hnid == NID_undef)
488 return -1;
489 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
490 return -1;
491 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
492 }
493 return 1;
494 #ifndef OPENSSL_NO_CMS
495 case ASN1_PKEY_CTRL_CMS_SIGN:
496 if (arg1 == 0) {
497 int snid, hnid;
498 X509_ALGOR *alg1, *alg2;
499 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
500 if (alg1 == NULL || alg1->algorithm == NULL)
501 return -1;
502 hnid = OBJ_obj2nid(alg1->algorithm);
503 if (hnid == NID_undef)
504 return -1;
505 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
506 return -1;
507 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
508 }
509 return 1;
510
511 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
512 if (arg1 == 1)
513 return ecdh_cms_decrypt(arg2);
514 else if (arg1 == 0)
515 return ecdh_cms_encrypt(arg2);
516 return -2;
517
518 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
519 *(int *)arg2 = CMS_RECIPINFO_AGREE;
520 return 1;
521 #endif
522
523 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
524 if (EVP_PKEY_id(pkey) == EVP_PKEY_SM2) {
525 /* For SM2, the only valid digest-alg is SM3 */
526 *(int *)arg2 = NID_sm3;
527 } else {
528 *(int *)arg2 = NID_sha256;
529 }
530 return 1;
531
532 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
533 return EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(pkey), arg2, arg1, NULL);
534
535 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
536 return EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(pkey),
537 POINT_CONVERSION_UNCOMPRESSED, arg2, NULL);
538
539 default:
540 return -2;
541
542 }
543
544 }
545
ec_pkey_check(const EVP_PKEY * pkey)546 static int ec_pkey_check(const EVP_PKEY *pkey)
547 {
548 EC_KEY *eckey = pkey->pkey.ec;
549
550 /* stay consistent to what EVP_PKEY_check demands */
551 if (eckey->priv_key == NULL) {
552 ECerr(EC_F_EC_PKEY_CHECK, EC_R_MISSING_PRIVATE_KEY);
553 return 0;
554 }
555
556 return EC_KEY_check_key(eckey);
557 }
558
ec_pkey_public_check(const EVP_PKEY * pkey)559 static int ec_pkey_public_check(const EVP_PKEY *pkey)
560 {
561 EC_KEY *eckey = pkey->pkey.ec;
562
563 /*
564 * Note: it unnecessary to check eckey->pub_key here since
565 * it will be checked in EC_KEY_check_key(). In fact, the
566 * EC_KEY_check_key() mainly checks the public key, and checks
567 * the private key optionally (only if there is one). So if
568 * someone passes a whole EC key (public + private), this
569 * will also work...
570 */
571
572 return EC_KEY_check_key(eckey);
573 }
574
ec_pkey_param_check(const EVP_PKEY * pkey)575 static int ec_pkey_param_check(const EVP_PKEY *pkey)
576 {
577 EC_KEY *eckey = pkey->pkey.ec;
578
579 /* stay consistent to what EVP_PKEY_check demands */
580 if (eckey->group == NULL) {
581 ECerr(EC_F_EC_PKEY_PARAM_CHECK, EC_R_MISSING_PARAMETERS);
582 return 0;
583 }
584
585 return EC_GROUP_check(eckey->group, NULL);
586 }
587
588 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
589 EVP_PKEY_EC,
590 EVP_PKEY_EC,
591 0,
592 "EC",
593 "OpenSSL EC algorithm",
594
595 eckey_pub_decode,
596 eckey_pub_encode,
597 eckey_pub_cmp,
598 eckey_pub_print,
599
600 eckey_priv_decode,
601 eckey_priv_encode,
602 eckey_priv_print,
603
604 int_ec_size,
605 ec_bits,
606 ec_security_bits,
607
608 eckey_param_decode,
609 eckey_param_encode,
610 ec_missing_parameters,
611 ec_copy_parameters,
612 ec_cmp_parameters,
613 eckey_param_print,
614 0,
615
616 int_ec_free,
617 ec_pkey_ctrl,
618 old_ec_priv_decode,
619 old_ec_priv_encode,
620
621 0, 0, 0,
622
623 ec_pkey_check,
624 ec_pkey_public_check,
625 ec_pkey_param_check
626 };
627
628 #if !defined(OPENSSL_NO_SM2)
629 const EVP_PKEY_ASN1_METHOD sm2_asn1_meth = {
630 EVP_PKEY_SM2,
631 EVP_PKEY_EC,
632 ASN1_PKEY_ALIAS
633 };
634 #endif
635
EC_KEY_print(BIO * bp,const EC_KEY * x,int off)636 int EC_KEY_print(BIO *bp, const EC_KEY *x, int off)
637 {
638 int private = EC_KEY_get0_private_key(x) != NULL;
639
640 return do_EC_KEY_print(bp, x, off,
641 private ? EC_KEY_PRINT_PRIVATE : EC_KEY_PRINT_PUBLIC);
642 }
643
ECParameters_print(BIO * bp,const EC_KEY * x)644 int ECParameters_print(BIO *bp, const EC_KEY *x)
645 {
646 return do_EC_KEY_print(bp, x, 4, EC_KEY_PRINT_PARAM);
647 }
648
649 #ifndef OPENSSL_NO_CMS
650
ecdh_cms_set_peerkey(EVP_PKEY_CTX * pctx,X509_ALGOR * alg,ASN1_BIT_STRING * pubkey)651 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
652 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
653 {
654 const ASN1_OBJECT *aoid;
655 int atype;
656 const void *aval;
657 int rv = 0;
658 EVP_PKEY *pkpeer = NULL;
659 EC_KEY *ecpeer = NULL;
660 const unsigned char *p;
661 int plen;
662 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
663 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
664 goto err;
665 /* If absent parameters get group from main key */
666 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
667 const EC_GROUP *grp;
668 EVP_PKEY *pk;
669 pk = EVP_PKEY_CTX_get0_pkey(pctx);
670 if (!pk)
671 goto err;
672 grp = EC_KEY_get0_group(pk->pkey.ec);
673 ecpeer = EC_KEY_new();
674 if (ecpeer == NULL)
675 goto err;
676 if (!EC_KEY_set_group(ecpeer, grp))
677 goto err;
678 } else {
679 ecpeer = eckey_type2param(atype, aval);
680 if (!ecpeer)
681 goto err;
682 }
683 /* We have parameters now set public key */
684 plen = ASN1_STRING_length(pubkey);
685 p = ASN1_STRING_get0_data(pubkey);
686 if (!p || !plen)
687 goto err;
688 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
689 goto err;
690 pkpeer = EVP_PKEY_new();
691 if (pkpeer == NULL)
692 goto err;
693 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
694 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
695 rv = 1;
696 err:
697 EC_KEY_free(ecpeer);
698 EVP_PKEY_free(pkpeer);
699 return rv;
700 }
701
702 /* Set KDF parameters based on KDF NID */
ecdh_cms_set_kdf_param(EVP_PKEY_CTX * pctx,int eckdf_nid)703 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
704 {
705 int kdf_nid, kdfmd_nid, cofactor;
706 const EVP_MD *kdf_md;
707 if (eckdf_nid == NID_undef)
708 return 0;
709
710 /* Lookup KDF type, cofactor mode and digest */
711 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
712 return 0;
713
714 if (kdf_nid == NID_dh_std_kdf)
715 cofactor = 0;
716 else if (kdf_nid == NID_dh_cofactor_kdf)
717 cofactor = 1;
718 else
719 return 0;
720
721 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
722 return 0;
723
724 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_63) <= 0)
725 return 0;
726
727 kdf_md = EVP_get_digestbynid(kdfmd_nid);
728 if (!kdf_md)
729 return 0;
730
731 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
732 return 0;
733 return 1;
734 }
735
ecdh_cms_set_shared_info(EVP_PKEY_CTX * pctx,CMS_RecipientInfo * ri)736 static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
737 {
738 int rv = 0;
739
740 X509_ALGOR *alg, *kekalg = NULL;
741 ASN1_OCTET_STRING *ukm;
742 const unsigned char *p;
743 unsigned char *der = NULL;
744 int plen, keylen;
745 const EVP_CIPHER *kekcipher;
746 EVP_CIPHER_CTX *kekctx;
747
748 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
749 return 0;
750
751 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
752 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
753 return 0;
754 }
755
756 if (alg->parameter->type != V_ASN1_SEQUENCE)
757 return 0;
758
759 p = alg->parameter->value.sequence->data;
760 plen = alg->parameter->value.sequence->length;
761 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
762 if (!kekalg)
763 goto err;
764 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
765 if (!kekctx)
766 goto err;
767 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
768 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
769 goto err;
770 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
771 goto err;
772 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
773 goto err;
774
775 keylen = EVP_CIPHER_CTX_key_length(kekctx);
776 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
777 goto err;
778
779 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
780
781 if (!plen)
782 goto err;
783
784 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
785 goto err;
786 der = NULL;
787
788 rv = 1;
789 err:
790 X509_ALGOR_free(kekalg);
791 OPENSSL_free(der);
792 return rv;
793 }
794
ecdh_cms_decrypt(CMS_RecipientInfo * ri)795 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
796 {
797 EVP_PKEY_CTX *pctx;
798 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
799 if (!pctx)
800 return 0;
801 /* See if we need to set peer key */
802 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
803 X509_ALGOR *alg;
804 ASN1_BIT_STRING *pubkey;
805 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
806 NULL, NULL, NULL))
807 return 0;
808 if (!alg || !pubkey)
809 return 0;
810 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
811 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
812 return 0;
813 }
814 }
815 /* Set ECDH derivation parameters and initialise unwrap context */
816 if (!ecdh_cms_set_shared_info(pctx, ri)) {
817 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
818 return 0;
819 }
820 return 1;
821 }
822
ecdh_cms_encrypt(CMS_RecipientInfo * ri)823 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
824 {
825 EVP_PKEY_CTX *pctx;
826 EVP_PKEY *pkey;
827 EVP_CIPHER_CTX *ctx;
828 int keylen;
829 X509_ALGOR *talg, *wrap_alg = NULL;
830 const ASN1_OBJECT *aoid;
831 ASN1_BIT_STRING *pubkey;
832 ASN1_STRING *wrap_str;
833 ASN1_OCTET_STRING *ukm;
834 unsigned char *penc = NULL;
835 int penclen;
836 int rv = 0;
837 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
838 const EVP_MD *kdf_md;
839 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
840 if (!pctx)
841 return 0;
842 /* Get ephemeral key */
843 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
844 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
845 NULL, NULL, NULL))
846 goto err;
847 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
848 /* Is everything uninitialised? */
849 if (aoid == OBJ_nid2obj(NID_undef)) {
850
851 EC_KEY *eckey = pkey->pkey.ec;
852 /* Set the key */
853 unsigned char *p;
854
855 penclen = i2o_ECPublicKey(eckey, NULL);
856 if (penclen <= 0)
857 goto err;
858 penc = OPENSSL_malloc(penclen);
859 if (penc == NULL)
860 goto err;
861 p = penc;
862 penclen = i2o_ECPublicKey(eckey, &p);
863 if (penclen <= 0)
864 goto err;
865 ASN1_STRING_set0(pubkey, penc, penclen);
866 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
867 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
868
869 penc = NULL;
870 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
871 V_ASN1_UNDEF, NULL);
872 }
873
874 /* See if custom parameters set */
875 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
876 if (kdf_type <= 0)
877 goto err;
878 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
879 goto err;
880 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
881 if (ecdh_nid < 0)
882 goto err;
883 else if (ecdh_nid == 0)
884 ecdh_nid = NID_dh_std_kdf;
885 else if (ecdh_nid == 1)
886 ecdh_nid = NID_dh_cofactor_kdf;
887
888 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
889 kdf_type = EVP_PKEY_ECDH_KDF_X9_63;
890 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
891 goto err;
892 } else
893 /* Unknown KDF */
894 goto err;
895 if (kdf_md == NULL) {
896 /* Fixme later for better MD */
897 kdf_md = EVP_sha1();
898 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
899 goto err;
900 }
901
902 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
903 goto err;
904
905 /* Lookup NID for KDF+cofactor+digest */
906
907 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
908 goto err;
909 /* Get wrap NID */
910 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
911 wrap_nid = EVP_CIPHER_CTX_type(ctx);
912 keylen = EVP_CIPHER_CTX_key_length(ctx);
913
914 /* Package wrap algorithm in an AlgorithmIdentifier */
915
916 wrap_alg = X509_ALGOR_new();
917 if (wrap_alg == NULL)
918 goto err;
919 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
920 wrap_alg->parameter = ASN1_TYPE_new();
921 if (wrap_alg->parameter == NULL)
922 goto err;
923 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
924 goto err;
925 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
926 ASN1_TYPE_free(wrap_alg->parameter);
927 wrap_alg->parameter = NULL;
928 }
929
930 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
931 goto err;
932
933 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
934
935 if (!penclen)
936 goto err;
937
938 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
939 goto err;
940 penc = NULL;
941
942 /*
943 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
944 * of another AlgorithmIdentifier.
945 */
946 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
947 if (!penc || !penclen)
948 goto err;
949 wrap_str = ASN1_STRING_new();
950 if (wrap_str == NULL)
951 goto err;
952 ASN1_STRING_set0(wrap_str, penc, penclen);
953 penc = NULL;
954 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
955
956 rv = 1;
957
958 err:
959 OPENSSL_free(penc);
960 X509_ALGOR_free(wrap_alg);
961 return rv;
962 }
963
964 #endif
965