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 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 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_EC_KEY_PRINT
, reason
);
514 OPENSSL_free(buffer
);
518 static int eckey_param_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
521 return do_EC_KEY_print(bp
, pkey
->pkey
.ec
, indent
, 0);
524 static int eckey_pub_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
527 return do_EC_KEY_print(bp
, pkey
->pkey
.ec
, indent
, 1);
531 static int eckey_priv_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
534 return do_EC_KEY_print(bp
, pkey
->pkey
.ec
, indent
, 2);
537 static int old_ec_priv_decode(EVP_PKEY
*pkey
,
538 const unsigned char **pder
, int derlen
)
541 if (!(ec
= d2i_ECPrivateKey (NULL
, pder
, derlen
)))
543 ECerr(EC_F_ECKEY_PRIV_DECODE
, EC_R_DECODE_ERROR
);
546 EVP_PKEY_assign_EC_KEY(pkey
, ec
);
550 static int old_ec_priv_encode(const EVP_PKEY
*pkey
, unsigned char **pder
)
552 return i2d_ECPrivateKey(pkey
->pkey
.ec
, pder
);
555 EVP_PKEY_ASN1_METHOD eckey_asn1_meth
=
561 "OpenSSL EC algorithm",
576 ec_missing_parameters
,