1 /*
2 * Copyright 2006-2023 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 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_OID);
42 return 0;
43 }
44 *ppval = asn1obj;
45 *pptype = V_ASN1_OBJECT;
46 } else { /* explicit parameters */
47
48 ASN1_STRING *pstr = NULL;
49 pstr = ASN1_STRING_new();
50 if (pstr == NULL)
51 return 0;
52
53 /*
54 * The cast in the following line is intentional as the
55 * `i2d_ECParameters` signature can't be constified (see discussion at
56 * https://github.com/openssl/openssl/pull/9347 where related and
57 * required constification backports were rejected).
58 *
59 * This cast should be safe anyway, because we can expect
60 * `i2d_ECParameters()` to treat the first argument as if it was const.
61 */
62 pstr->length = i2d_ECParameters((EC_KEY *)ec_key, &pstr->data);
63 if (pstr->length <= 0) {
64 ASN1_STRING_free(pstr);
65 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
66 return 0;
67 }
68 *ppval = pstr;
69 *pptype = V_ASN1_SEQUENCE;
70 }
71 return 1;
72 }
73
eckey_pub_encode(X509_PUBKEY * pk,const EVP_PKEY * pkey)74 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
75 {
76 const EC_KEY *ec_key = pkey->pkey.ec;
77 void *pval = NULL;
78 int ptype;
79 unsigned char *penc = NULL, *p;
80 int penclen;
81
82 if (!eckey_param2type(&ptype, &pval, ec_key)) {
83 ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
84 return 0;
85 }
86 penclen = i2o_ECPublicKey(ec_key, NULL);
87 if (penclen <= 0)
88 goto err;
89 penc = OPENSSL_malloc(penclen);
90 if (penc == NULL)
91 goto err;
92 p = penc;
93 penclen = i2o_ECPublicKey(ec_key, &p);
94 if (penclen <= 0)
95 goto err;
96 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
97 ptype, pval, penc, penclen))
98 return 1;
99 err:
100 if (ptype == V_ASN1_SEQUENCE)
101 ASN1_STRING_free(pval);
102 OPENSSL_free(penc);
103 return 0;
104 }
105
eckey_type2param(int ptype,const void * pval)106 static EC_KEY *eckey_type2param(int ptype, const void *pval)
107 {
108 EC_KEY *eckey = NULL;
109 EC_GROUP *group = NULL;
110
111 if (ptype == V_ASN1_SEQUENCE) {
112 const ASN1_STRING *pstr = pval;
113 const unsigned char *pm = pstr->data;
114 int pmlen = pstr->length;
115
116 if ((eckey = d2i_ECParameters(NULL, &pm, pmlen)) == NULL) {
117 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
118 goto ecerr;
119 }
120 } else if (ptype == V_ASN1_OBJECT) {
121 const ASN1_OBJECT *poid = pval;
122
123 /*
124 * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
125 */
126 if ((eckey = EC_KEY_new()) == NULL) {
127 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
128 goto ecerr;
129 }
130 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
131 if (group == NULL)
132 goto ecerr;
133 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
134 if (EC_KEY_set_group(eckey, group) == 0)
135 goto ecerr;
136 EC_GROUP_free(group);
137 } else {
138 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
139 goto ecerr;
140 }
141
142 return eckey;
143
144 ecerr:
145 EC_KEY_free(eckey);
146 EC_GROUP_free(group);
147 return NULL;
148 }
149
eckey_pub_decode(EVP_PKEY * pkey,X509_PUBKEY * pubkey)150 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
151 {
152 const unsigned char *p = NULL;
153 const void *pval;
154 int ptype, pklen;
155 EC_KEY *eckey = NULL;
156 X509_ALGOR *palg;
157
158 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
159 return 0;
160 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
161
162 eckey = eckey_type2param(ptype, pval);
163
164 if (!eckey) {
165 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
166 return 0;
167 }
168
169 /* We have parameters now set public key */
170 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
171 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
172 goto ecerr;
173 }
174
175 EVP_PKEY_assign_EC_KEY(pkey, eckey);
176 return 1;
177
178 ecerr:
179 EC_KEY_free(eckey);
180 return 0;
181 }
182
eckey_pub_cmp(const EVP_PKEY * a,const EVP_PKEY * b)183 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
184 {
185 int r;
186 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
187 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
188 *pb = EC_KEY_get0_public_key(b->pkey.ec);
189 if (group == NULL || pa == NULL || pb == NULL)
190 return -2;
191 r = EC_POINT_cmp(group, pa, pb, NULL);
192 if (r == 0)
193 return 1;
194 if (r == 1)
195 return 0;
196 return -2;
197 }
198
eckey_priv_decode(EVP_PKEY * pkey,const PKCS8_PRIV_KEY_INFO * p8)199 static int eckey_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
200 {
201 const unsigned char *p = NULL;
202 const void *pval;
203 int ptype, pklen;
204 EC_KEY *eckey = NULL;
205 const X509_ALGOR *palg;
206
207 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
208 return 0;
209 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
210
211 eckey = eckey_type2param(ptype, pval);
212
213 if (!eckey)
214 goto ecliberr;
215
216 /* We have parameters now set private key */
217 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
218 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
219 goto ecerr;
220 }
221
222 EVP_PKEY_assign_EC_KEY(pkey, eckey);
223 return 1;
224
225 ecliberr:
226 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
227 ecerr:
228 EC_KEY_free(eckey);
229 return 0;
230 }
231
eckey_priv_encode(PKCS8_PRIV_KEY_INFO * p8,const EVP_PKEY * pkey)232 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
233 {
234 EC_KEY ec_key = *(pkey->pkey.ec);
235 unsigned char *ep, *p;
236 int eplen, ptype;
237 void *pval;
238 unsigned int old_flags;
239
240 if (!eckey_param2type(&ptype, &pval, &ec_key)) {
241 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
242 return 0;
243 }
244
245 /* set the private key */
246
247 /*
248 * do not include the parameters in the SEC1 private key see PKCS#11
249 * 12.11
250 */
251 old_flags = EC_KEY_get_enc_flags(&ec_key);
252 EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS);
253
254 eplen = i2d_ECPrivateKey(&ec_key, NULL);
255 if (!eplen) {
256 if (ptype == V_ASN1_SEQUENCE)
257 ASN1_STRING_free(pval);
258 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
259 return 0;
260 }
261 ep = OPENSSL_malloc(eplen);
262 if (ep == NULL) {
263 if (ptype == V_ASN1_SEQUENCE)
264 ASN1_STRING_free(pval);
265 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
266 return 0;
267 }
268 p = ep;
269 if (!i2d_ECPrivateKey(&ec_key, &p)) {
270 OPENSSL_clear_free(ep, eplen);
271 if (ptype == V_ASN1_SEQUENCE)
272 ASN1_STRING_free(pval);
273 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
274 return 0;
275 }
276
277 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
278 ptype, pval, ep, eplen)) {
279 OPENSSL_clear_free(ep, eplen);
280 if (ptype == V_ASN1_SEQUENCE)
281 ASN1_STRING_free(pval);
282 return 0;
283 }
284
285 return 1;
286 }
287
int_ec_size(const EVP_PKEY * pkey)288 static int int_ec_size(const EVP_PKEY *pkey)
289 {
290 return ECDSA_size(pkey->pkey.ec);
291 }
292
ec_bits(const EVP_PKEY * pkey)293 static int ec_bits(const EVP_PKEY *pkey)
294 {
295 return EC_GROUP_order_bits(EC_KEY_get0_group(pkey->pkey.ec));
296 }
297
ec_security_bits(const EVP_PKEY * pkey)298 static int ec_security_bits(const EVP_PKEY *pkey)
299 {
300 int ecbits = ec_bits(pkey);
301 if (ecbits >= 512)
302 return 256;
303 if (ecbits >= 384)
304 return 192;
305 if (ecbits >= 256)
306 return 128;
307 if (ecbits >= 224)
308 return 112;
309 if (ecbits >= 160)
310 return 80;
311 return ecbits / 2;
312 }
313
ec_missing_parameters(const EVP_PKEY * pkey)314 static int ec_missing_parameters(const EVP_PKEY *pkey)
315 {
316 if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL)
317 return 1;
318 return 0;
319 }
320
ec_copy_parameters(EVP_PKEY * to,const EVP_PKEY * from)321 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
322 {
323 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
324
325 if (group == NULL)
326 return 0;
327 if (to->pkey.ec == NULL) {
328 to->pkey.ec = EC_KEY_new();
329 if (to->pkey.ec == NULL)
330 goto err;
331 }
332 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
333 goto err;
334 EC_GROUP_free(group);
335 return 1;
336 err:
337 EC_GROUP_free(group);
338 return 0;
339 }
340
ec_cmp_parameters(const EVP_PKEY * a,const EVP_PKEY * b)341 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
342 {
343 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
344 *group_b = EC_KEY_get0_group(b->pkey.ec);
345 if (group_a == NULL || group_b == NULL)
346 return -2;
347 if (EC_GROUP_cmp(group_a, group_b, NULL))
348 return 0;
349 else
350 return 1;
351 }
352
int_ec_free(EVP_PKEY * pkey)353 static void int_ec_free(EVP_PKEY *pkey)
354 {
355 EC_KEY_free(pkey->pkey.ec);
356 }
357
358 typedef enum {
359 EC_KEY_PRINT_PRIVATE,
360 EC_KEY_PRINT_PUBLIC,
361 EC_KEY_PRINT_PARAM
362 } ec_print_t;
363
do_EC_KEY_print(BIO * bp,const EC_KEY * x,int off,ec_print_t ktype)364 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, ec_print_t ktype)
365 {
366 const char *ecstr;
367 unsigned char *priv = NULL, *pub = NULL;
368 size_t privlen = 0, publen = 0;
369 int ret = 0;
370 const EC_GROUP *group;
371
372 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
373 ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_PASSED_NULL_PARAMETER);
374 return 0;
375 }
376
377 if (ktype != EC_KEY_PRINT_PARAM && EC_KEY_get0_public_key(x) != NULL) {
378 publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
379 if (publen == 0)
380 goto err;
381 }
382
383 if (ktype == EC_KEY_PRINT_PRIVATE && EC_KEY_get0_private_key(x) != NULL) {
384 privlen = EC_KEY_priv2buf(x, &priv);
385 if (privlen == 0)
386 goto err;
387 }
388
389 if (ktype == EC_KEY_PRINT_PRIVATE)
390 ecstr = "Private-Key";
391 else if (ktype == EC_KEY_PRINT_PUBLIC)
392 ecstr = "Public-Key";
393 else
394 ecstr = "ECDSA-Parameters";
395
396 if (!BIO_indent(bp, off, 128))
397 goto err;
398 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
399 EC_GROUP_order_bits(group)) <= 0)
400 goto err;
401
402 if (privlen != 0) {
403 if (BIO_printf(bp, "%*spriv:\n", off, "") <= 0)
404 goto err;
405 if (ASN1_buf_print(bp, priv, privlen, off + 4) == 0)
406 goto err;
407 }
408
409 if (publen != 0) {
410 if (BIO_printf(bp, "%*spub:\n", off, "") <= 0)
411 goto err;
412 if (ASN1_buf_print(bp, pub, publen, off + 4) == 0)
413 goto err;
414 }
415
416 if (!ECPKParameters_print(bp, group, off))
417 goto err;
418 ret = 1;
419 err:
420 if (!ret)
421 ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_EC_LIB);
422 OPENSSL_clear_free(priv, privlen);
423 OPENSSL_free(pub);
424 return ret;
425 }
426
eckey_param_decode(EVP_PKEY * pkey,const unsigned char ** pder,int derlen)427 static int eckey_param_decode(EVP_PKEY *pkey,
428 const unsigned char **pder, int derlen)
429 {
430 EC_KEY *eckey;
431
432 if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL) {
433 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
434 return 0;
435 }
436 EVP_PKEY_assign_EC_KEY(pkey, eckey);
437 return 1;
438 }
439
eckey_param_encode(const EVP_PKEY * pkey,unsigned char ** pder)440 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
441 {
442 return i2d_ECParameters(pkey->pkey.ec, pder);
443 }
444
eckey_param_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)445 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
446 ASN1_PCTX *ctx)
447 {
448 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PARAM);
449 }
450
eckey_pub_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)451 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
452 ASN1_PCTX *ctx)
453 {
454 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PUBLIC);
455 }
456
eckey_priv_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)457 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
458 ASN1_PCTX *ctx)
459 {
460 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PRIVATE);
461 }
462
old_ec_priv_decode(EVP_PKEY * pkey,const unsigned char ** pder,int derlen)463 static int old_ec_priv_decode(EVP_PKEY *pkey,
464 const unsigned char **pder, int derlen)
465 {
466 EC_KEY *ec;
467
468 if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL) {
469 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
470 return 0;
471 }
472 EVP_PKEY_assign_EC_KEY(pkey, ec);
473 return 1;
474 }
475
old_ec_priv_encode(const EVP_PKEY * pkey,unsigned char ** pder)476 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
477 {
478 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
479 }
480
ec_pkey_ctrl(EVP_PKEY * pkey,int op,long arg1,void * arg2)481 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
482 {
483 switch (op) {
484 case ASN1_PKEY_CTRL_PKCS7_SIGN:
485 if (arg1 == 0) {
486 int snid, hnid;
487 X509_ALGOR *alg1, *alg2;
488 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
489 if (alg1 == NULL || alg1->algorithm == NULL)
490 return -1;
491 hnid = OBJ_obj2nid(alg1->algorithm);
492 if (hnid == NID_undef)
493 return -1;
494 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
495 return -1;
496 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
497 }
498 return 1;
499 #ifndef OPENSSL_NO_CMS
500 case ASN1_PKEY_CTRL_CMS_SIGN:
501 if (arg1 == 0) {
502 int snid, hnid;
503 X509_ALGOR *alg1, *alg2;
504 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
505 if (alg1 == NULL || alg1->algorithm == NULL)
506 return -1;
507 hnid = OBJ_obj2nid(alg1->algorithm);
508 if (hnid == NID_undef)
509 return -1;
510 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
511 return -1;
512 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
513 }
514 return 1;
515
516 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
517 if (arg1 == 1)
518 return ecdh_cms_decrypt(arg2);
519 else if (arg1 == 0)
520 return ecdh_cms_encrypt(arg2);
521 return -2;
522
523 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
524 *(int *)arg2 = CMS_RECIPINFO_AGREE;
525 return 1;
526 #endif
527
528 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
529 if (EVP_PKEY_id(pkey) == EVP_PKEY_SM2) {
530 /* For SM2, the only valid digest-alg is SM3 */
531 *(int *)arg2 = NID_sm3;
532 } else {
533 *(int *)arg2 = NID_sha256;
534 }
535 return 1;
536
537 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
538 return EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(pkey), arg2, arg1, NULL);
539
540 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
541 return EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(pkey),
542 POINT_CONVERSION_UNCOMPRESSED, arg2, NULL);
543
544 default:
545 return -2;
546
547 }
548
549 }
550
ec_pkey_check(const EVP_PKEY * pkey)551 static int ec_pkey_check(const EVP_PKEY *pkey)
552 {
553 EC_KEY *eckey = pkey->pkey.ec;
554
555 /* stay consistent to what EVP_PKEY_check demands */
556 if (eckey->priv_key == NULL) {
557 ECerr(EC_F_EC_PKEY_CHECK, EC_R_MISSING_PRIVATE_KEY);
558 return 0;
559 }
560
561 return EC_KEY_check_key(eckey);
562 }
563
ec_pkey_public_check(const EVP_PKEY * pkey)564 static int ec_pkey_public_check(const EVP_PKEY *pkey)
565 {
566 EC_KEY *eckey = pkey->pkey.ec;
567
568 /*
569 * Note: it unnecessary to check eckey->pub_key here since
570 * it will be checked in EC_KEY_check_key(). In fact, the
571 * EC_KEY_check_key() mainly checks the public key, and checks
572 * the private key optionally (only if there is one). So if
573 * someone passes a whole EC key (public + private), this
574 * will also work...
575 */
576
577 return EC_KEY_check_key(eckey);
578 }
579
ec_pkey_param_check(const EVP_PKEY * pkey)580 static int ec_pkey_param_check(const EVP_PKEY *pkey)
581 {
582 EC_KEY *eckey = pkey->pkey.ec;
583
584 /* stay consistent to what EVP_PKEY_check demands */
585 if (eckey->group == NULL) {
586 ECerr(EC_F_EC_PKEY_PARAM_CHECK, EC_R_MISSING_PARAMETERS);
587 return 0;
588 }
589
590 return EC_GROUP_check(eckey->group, NULL);
591 }
592
593 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
594 EVP_PKEY_EC,
595 EVP_PKEY_EC,
596 0,
597 "EC",
598 "OpenSSL EC algorithm",
599
600 eckey_pub_decode,
601 eckey_pub_encode,
602 eckey_pub_cmp,
603 eckey_pub_print,
604
605 eckey_priv_decode,
606 eckey_priv_encode,
607 eckey_priv_print,
608
609 int_ec_size,
610 ec_bits,
611 ec_security_bits,
612
613 eckey_param_decode,
614 eckey_param_encode,
615 ec_missing_parameters,
616 ec_copy_parameters,
617 ec_cmp_parameters,
618 eckey_param_print,
619 0,
620
621 int_ec_free,
622 ec_pkey_ctrl,
623 old_ec_priv_decode,
624 old_ec_priv_encode,
625
626 0, 0, 0,
627
628 ec_pkey_check,
629 ec_pkey_public_check,
630 ec_pkey_param_check
631 };
632
633 #if !defined(OPENSSL_NO_SM2)
634 const EVP_PKEY_ASN1_METHOD sm2_asn1_meth = {
635 EVP_PKEY_SM2,
636 EVP_PKEY_EC,
637 ASN1_PKEY_ALIAS
638 };
639 #endif
640
EC_KEY_print(BIO * bp,const EC_KEY * x,int off)641 int EC_KEY_print(BIO *bp, const EC_KEY *x, int off)
642 {
643 int private = EC_KEY_get0_private_key(x) != NULL;
644
645 return do_EC_KEY_print(bp, x, off,
646 private ? EC_KEY_PRINT_PRIVATE : EC_KEY_PRINT_PUBLIC);
647 }
648
ECParameters_print(BIO * bp,const EC_KEY * x)649 int ECParameters_print(BIO *bp, const EC_KEY *x)
650 {
651 return do_EC_KEY_print(bp, x, 4, EC_KEY_PRINT_PARAM);
652 }
653
654 #ifndef OPENSSL_NO_CMS
655
ecdh_cms_set_peerkey(EVP_PKEY_CTX * pctx,X509_ALGOR * alg,ASN1_BIT_STRING * pubkey)656 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
657 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
658 {
659 const ASN1_OBJECT *aoid;
660 int atype;
661 const void *aval;
662 int rv = 0;
663 EVP_PKEY *pkpeer = NULL;
664 EC_KEY *ecpeer = NULL;
665 const unsigned char *p;
666 int plen;
667 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
668 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
669 goto err;
670 /* If absent parameters get group from main key */
671 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
672 const EC_GROUP *grp;
673 EVP_PKEY *pk;
674 pk = EVP_PKEY_CTX_get0_pkey(pctx);
675 if (!pk)
676 goto err;
677 grp = EC_KEY_get0_group(pk->pkey.ec);
678 ecpeer = EC_KEY_new();
679 if (ecpeer == NULL)
680 goto err;
681 if (!EC_KEY_set_group(ecpeer, grp))
682 goto err;
683 } else {
684 ecpeer = eckey_type2param(atype, aval);
685 if (!ecpeer)
686 goto err;
687 }
688 /* We have parameters now set public key */
689 plen = ASN1_STRING_length(pubkey);
690 p = ASN1_STRING_get0_data(pubkey);
691 if (!p || !plen)
692 goto err;
693 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
694 goto err;
695 pkpeer = EVP_PKEY_new();
696 if (pkpeer == NULL)
697 goto err;
698 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
699 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
700 rv = 1;
701 err:
702 EC_KEY_free(ecpeer);
703 EVP_PKEY_free(pkpeer);
704 return rv;
705 }
706
707 /* Set KDF parameters based on KDF NID */
ecdh_cms_set_kdf_param(EVP_PKEY_CTX * pctx,int eckdf_nid)708 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
709 {
710 int kdf_nid, kdfmd_nid, cofactor;
711 const EVP_MD *kdf_md;
712 if (eckdf_nid == NID_undef)
713 return 0;
714
715 /* Lookup KDF type, cofactor mode and digest */
716 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
717 return 0;
718
719 if (kdf_nid == NID_dh_std_kdf)
720 cofactor = 0;
721 else if (kdf_nid == NID_dh_cofactor_kdf)
722 cofactor = 1;
723 else
724 return 0;
725
726 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
727 return 0;
728
729 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_63) <= 0)
730 return 0;
731
732 kdf_md = EVP_get_digestbynid(kdfmd_nid);
733 if (!kdf_md)
734 return 0;
735
736 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
737 return 0;
738 return 1;
739 }
740
ecdh_cms_set_shared_info(EVP_PKEY_CTX * pctx,CMS_RecipientInfo * ri)741 static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
742 {
743 int rv = 0;
744
745 X509_ALGOR *alg, *kekalg = NULL;
746 ASN1_OCTET_STRING *ukm;
747 const unsigned char *p;
748 unsigned char *der = NULL;
749 int plen, keylen;
750 const EVP_CIPHER *kekcipher;
751 EVP_CIPHER_CTX *kekctx;
752
753 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
754 return 0;
755
756 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
757 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
758 return 0;
759 }
760
761 if (alg->parameter->type != V_ASN1_SEQUENCE)
762 return 0;
763
764 p = alg->parameter->value.sequence->data;
765 plen = alg->parameter->value.sequence->length;
766 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
767 if (!kekalg)
768 goto err;
769 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
770 if (!kekctx)
771 goto err;
772 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
773 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
774 goto err;
775 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
776 goto err;
777 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
778 goto err;
779
780 keylen = EVP_CIPHER_CTX_key_length(kekctx);
781 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
782 goto err;
783
784 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
785
786 if (!plen)
787 goto err;
788
789 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
790 goto err;
791 der = NULL;
792
793 rv = 1;
794 err:
795 X509_ALGOR_free(kekalg);
796 OPENSSL_free(der);
797 return rv;
798 }
799
ecdh_cms_decrypt(CMS_RecipientInfo * ri)800 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
801 {
802 EVP_PKEY_CTX *pctx;
803 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
804 if (!pctx)
805 return 0;
806 /* See if we need to set peer key */
807 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
808 X509_ALGOR *alg;
809 ASN1_BIT_STRING *pubkey;
810 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
811 NULL, NULL, NULL))
812 return 0;
813 if (!alg || !pubkey)
814 return 0;
815 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
816 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
817 return 0;
818 }
819 }
820 /* Set ECDH derivation parameters and initialise unwrap context */
821 if (!ecdh_cms_set_shared_info(pctx, ri)) {
822 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
823 return 0;
824 }
825 return 1;
826 }
827
ecdh_cms_encrypt(CMS_RecipientInfo * ri)828 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
829 {
830 EVP_PKEY_CTX *pctx;
831 EVP_PKEY *pkey;
832 EVP_CIPHER_CTX *ctx;
833 int keylen;
834 X509_ALGOR *talg, *wrap_alg = NULL;
835 const ASN1_OBJECT *aoid;
836 ASN1_BIT_STRING *pubkey;
837 ASN1_STRING *wrap_str;
838 ASN1_OCTET_STRING *ukm;
839 unsigned char *penc = NULL;
840 int penclen;
841 int rv = 0;
842 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
843 const EVP_MD *kdf_md;
844 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
845 if (!pctx)
846 return 0;
847 /* Get ephemeral key */
848 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
849 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
850 NULL, NULL, NULL))
851 goto err;
852 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
853 /* Is everything uninitialised? */
854 if (aoid == OBJ_nid2obj(NID_undef)) {
855
856 EC_KEY *eckey = pkey->pkey.ec;
857 /* Set the key */
858 unsigned char *p;
859
860 penclen = i2o_ECPublicKey(eckey, NULL);
861 if (penclen <= 0)
862 goto err;
863 penc = OPENSSL_malloc(penclen);
864 if (penc == NULL)
865 goto err;
866 p = penc;
867 penclen = i2o_ECPublicKey(eckey, &p);
868 if (penclen <= 0)
869 goto err;
870 ASN1_STRING_set0(pubkey, penc, penclen);
871 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
872 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
873
874 penc = NULL;
875 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
876 V_ASN1_UNDEF, NULL);
877 }
878
879 /* See if custom parameters set */
880 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
881 if (kdf_type <= 0)
882 goto err;
883 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
884 goto err;
885 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
886 if (ecdh_nid < 0)
887 goto err;
888 else if (ecdh_nid == 0)
889 ecdh_nid = NID_dh_std_kdf;
890 else if (ecdh_nid == 1)
891 ecdh_nid = NID_dh_cofactor_kdf;
892
893 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
894 kdf_type = EVP_PKEY_ECDH_KDF_X9_63;
895 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
896 goto err;
897 } else
898 /* Unknown KDF */
899 goto err;
900 if (kdf_md == NULL) {
901 /* Fixme later for better MD */
902 kdf_md = EVP_sha1();
903 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
904 goto err;
905 }
906
907 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
908 goto err;
909
910 /* Lookup NID for KDF+cofactor+digest */
911
912 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
913 goto err;
914 /* Get wrap NID */
915 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
916 wrap_nid = EVP_CIPHER_CTX_type(ctx);
917 keylen = EVP_CIPHER_CTX_key_length(ctx);
918
919 /* Package wrap algorithm in an AlgorithmIdentifier */
920
921 wrap_alg = X509_ALGOR_new();
922 if (wrap_alg == NULL)
923 goto err;
924 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
925 wrap_alg->parameter = ASN1_TYPE_new();
926 if (wrap_alg->parameter == NULL)
927 goto err;
928 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
929 goto err;
930 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
931 ASN1_TYPE_free(wrap_alg->parameter);
932 wrap_alg->parameter = NULL;
933 }
934
935 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
936 goto err;
937
938 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
939
940 if (!penclen)
941 goto err;
942
943 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
944 goto err;
945 penc = NULL;
946
947 /*
948 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
949 * of another AlgorithmIdentifier.
950 */
951 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
952 if (!penc || !penclen)
953 goto err;
954 wrap_str = ASN1_STRING_new();
955 if (wrap_str == NULL)
956 goto err;
957 ASN1_STRING_set0(wrap_str, penc, penclen);
958 penc = NULL;
959 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
960
961 rv = 1;
962
963 err:
964 OPENSSL_free(penc);
965 X509_ALGOR_free(wrap_alg);
966 return rv;
967 }
968
969 #endif
970