1 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
4 /* ====================================================================
5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
60 #include <openssl/x509.h>
61 #include <openssl/ec.h>
62 #include "asn1_locl.h"
64 static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
66 const EC_GROUP *group;
68 if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL)
70 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
73 if (EC_GROUP_get_asn1_flag(group)
74 && (nid = EC_GROUP_get_curve_name(group)))
75 /* we have a 'named curve' => just set the OID */
77 *ppval = OBJ_nid2obj(nid);
78 *pptype = V_ASN1_OBJECT;
80 else /* explicit parameters */
82 ASN1_STRING *pstr = NULL;
83 pstr = ASN1_STRING_new();
86 pstr->length = i2d_ECParameters(ec_key, &pstr->data);
89 ASN1_STRING_free(pstr);
90 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
94 *pptype = V_ASN1_SEQUENCE;
99 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
101 EC_KEY *ec_key = pkey->pkey.ec;
104 unsigned char *penc = NULL, *p;
107 if (!eckey_param2type(&ptype, &pval, ec_key))
109 ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
112 penclen = i2o_ECPublicKey(ec_key, NULL);
115 penc = OPENSSL_malloc(penclen);
119 penclen = i2o_ECPublicKey(ec_key, &p);
122 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
123 ptype, pval, penc, penclen))
126 if (ptype == V_ASN1_OBJECT)
127 ASN1_OBJECT_free(pval);
129 ASN1_STRING_free(pval);
135 static EC_KEY *eckey_type2param(int ptype, void *pval)
137 EC_KEY *eckey = NULL;
138 if (ptype == V_ASN1_SEQUENCE)
140 ASN1_STRING *pstr = pval;
141 const unsigned char *pm = NULL;
144 pmlen = pstr->length;
145 if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen)))
147 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
151 else if (ptype == V_ASN1_OBJECT)
153 ASN1_OBJECT *poid = pval;
156 /* type == V_ASN1_OBJECT => the parameters are given
159 if ((eckey = EC_KEY_new()) == NULL)
161 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
164 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
167 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
168 if (EC_KEY_set_group(eckey, group) == 0)
170 EC_GROUP_free(group);
174 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
186 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
188 const unsigned char *p = NULL;
191 EC_KEY *eckey = NULL;
194 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
196 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
198 eckey = eckey_type2param(ptype, pval);
202 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
206 /* We have parameters now set public key */
207 if (!o2i_ECPublicKey(&eckey, &p, pklen))
209 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
213 EVP_PKEY_assign_EC_KEY(pkey, eckey);
222 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
225 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
226 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
227 *pb = EC_KEY_get0_public_key(b->pkey.ec);
228 r = EC_POINT_cmp(group, pa, pb, NULL);
236 static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
238 const unsigned char *p = NULL;
241 EC_KEY *eckey = NULL;
244 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
246 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
248 eckey = eckey_type2param(ptype, pval);
253 /* We have parameters now set private key */
254 if (!d2i_ECPrivateKey(&eckey, &p, pklen))
256 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
260 /* calculate public key (if necessary) */
261 if (EC_KEY_get0_public_key(eckey) == NULL)
263 const BIGNUM *priv_key;
264 const EC_GROUP *group;
266 /* the public key was not included in the SEC1 private
267 * key => calculate the public key */
268 group = EC_KEY_get0_group(eckey);
269 pub_key = EC_POINT_new(group);
272 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
275 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group)))
277 EC_POINT_free(pub_key);
278 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
281 priv_key = EC_KEY_get0_private_key(eckey);
282 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL))
284 EC_POINT_free(pub_key);
285 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
288 if (EC_KEY_set_public_key(eckey, pub_key) == 0)
290 EC_POINT_free(pub_key);
291 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
294 EC_POINT_free(pub_key);
297 EVP_PKEY_assign_EC_KEY(pkey, eckey);
301 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
308 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
311 unsigned char *ep, *p;
314 unsigned int tmp_flags, old_flags;
316 ec_key = pkey->pkey.ec;
318 if (!eckey_param2type(&ptype, &pval, ec_key))
320 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
324 /* set the private key */
326 /* do not include the parameters in the SEC1 private key
327 * see PKCS#11 12.11 */
328 old_flags = EC_KEY_get_enc_flags(ec_key);
329 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
330 EC_KEY_set_enc_flags(ec_key, tmp_flags);
331 eplen = i2d_ECPrivateKey(ec_key, NULL);
334 EC_KEY_set_enc_flags(ec_key, old_flags);
335 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
338 ep = (unsigned char *) OPENSSL_malloc(eplen);
341 EC_KEY_set_enc_flags(ec_key, old_flags);
342 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
346 if (!i2d_ECPrivateKey(ec_key, &p))
348 EC_KEY_set_enc_flags(ec_key, old_flags);
350 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
352 /* restore old encoding flags */
353 EC_KEY_set_enc_flags(ec_key, old_flags);
355 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
356 ptype, pval, ep, eplen))
362 static int int_ec_size(const EVP_PKEY *pkey)
364 return ECDSA_size(pkey->pkey.ec);
367 static int ec_bits(const EVP_PKEY *pkey)
369 BIGNUM *order = BN_new();
370 const EC_GROUP *group;
378 group = EC_KEY_get0_group(pkey->pkey.ec);
379 if (!EC_GROUP_get_order(group, order, NULL))
385 ret = BN_num_bits(order);
390 static int ec_missing_parameters(const EVP_PKEY *pkey)
392 if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
397 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
399 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
402 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
404 EC_GROUP_free(group);
408 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
410 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
411 *group_b = EC_KEY_get0_group(b->pkey.ec);
412 if (EC_GROUP_cmp(group_a, group_b, NULL))
418 static void int_ec_free(EVP_PKEY *pkey)
420 EC_KEY_free(pkey->pkey.ec);
423 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype)
425 unsigned char *buffer=NULL;
428 int ret=0, reason=ERR_R_BIO_LIB;
429 BIGNUM *pub_key=NULL, *order=NULL;
431 const EC_GROUP *group;
432 const EC_POINT *public_key;
433 const BIGNUM *priv_key;
435 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL)
437 reason = ERR_R_PASSED_NULL_PARAMETER;
444 reason = ERR_R_MALLOC_FAILURE;
450 public_key = EC_KEY_get0_public_key(x);
451 if ((pub_key = EC_POINT_point2bn(group, public_key,
452 EC_KEY_get_conv_form(x), NULL, ctx)) == NULL)
454 reason = ERR_R_EC_LIB;
458 buf_len = (size_t)BN_num_bytes(pub_key);
463 priv_key = EC_KEY_get0_private_key(x);
464 if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
473 if ((buffer = OPENSSL_malloc(buf_len)) == NULL)
475 reason = ERR_R_MALLOC_FAILURE;
480 ecstr = "Private-Key";
482 ecstr = "Public-Key";
484 ecstr = "ECDSA-Parameters";
486 if (!BIO_indent(bp, off, 128))
488 if ((order = BN_new()) == NULL)
490 if (!EC_GROUP_get_order(group, order, NULL))
492 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
493 BN_num_bits(order)) <= 0) goto err;
495 if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
498 if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
501 if (!ECPKParameters_print(bp, group, off))
506 ECerr(EC_F_DO_EC_KEY_PRINT, reason);
514 OPENSSL_free(buffer);
518 static int eckey_param_decode(EVP_PKEY *pkey,
519 const unsigned char **pder, int derlen)
522 if (!(eckey = d2i_ECParameters(NULL, pder, derlen)))
524 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
527 EVP_PKEY_assign_EC_KEY(pkey, eckey);
531 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
533 return i2d_ECParameters(pkey->pkey.ec, pder);
536 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
539 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
542 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
545 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
549 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
552 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
555 static int old_ec_priv_decode(EVP_PKEY *pkey,
556 const unsigned char **pder, int derlen)
559 if (!(ec = d2i_ECPrivateKey (NULL, pder, derlen)))
561 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
564 EVP_PKEY_assign_EC_KEY(pkey, ec);
568 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
570 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
573 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
577 case ASN1_PKEY_CTRL_PKCS7_SIGN:
580 X509_ALGOR *alg1, *alg2;
581 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
582 X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_sha1),
584 X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_ecdsa_with_SHA1),
589 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
590 *(int *)arg2 = NID_sha1;
600 EVP_PKEY_ASN1_METHOD eckey_asn1_meth =
606 "OpenSSL EC algorithm",
622 ec_missing_parameters,