1 /* crypto/ec/ec_key.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * openssl-core@openssl.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
60 #include <openssl/err.h>
62 EC_KEY
*EC_KEY_new(void)
66 ret
=(EC_KEY
*)OPENSSL_malloc(sizeof(EC_KEY
));
69 ECerr(EC_F_EC_NEW
, ERR_R_MALLOC_FAILURE
);
78 ret
->conv_form
= POINT_CONVERSION_UNCOMPRESSED
;
80 ret
->meth_data
= NULL
;
85 void EC_KEY_free(EC_KEY
*r
)
89 if (r
== NULL
) return;
91 i
=CRYPTO_add(&r
->references
,-1,CRYPTO_LOCK_EC
);
93 REF_PRINT("EC_KEY",r
);
99 fprintf(stderr
,"EC_KEY_free, bad reference count\n");
104 if (r
->group
!= NULL
)
105 EC_GROUP_free(r
->group
);
106 if (r
->pub_key
!= NULL
)
107 EC_POINT_free(r
->pub_key
);
108 if (r
->priv_key
!= NULL
)
109 BN_clear_free(r
->priv_key
);
111 if (r
->meth_data
&& r
->meth_data
->finish
)
112 r
->meth_data
->finish(r
);
114 memset((void *)r
, 0x0, sizeof(EC_KEY
));
119 EC_KEY
*EC_KEY_copy(EC_KEY
*dest
, const EC_KEY
*src
)
121 if (dest
== NULL
|| src
== NULL
)
123 ECerr(EC_F_EC_KEY_COPY
, ERR_R_PASSED_NULL_PARAMETER
);
126 /* copy the parameters */
129 const EC_METHOD
*meth
= EC_GROUP_method_of(src
->group
);
130 /* clear the old group */
132 EC_GROUP_free(dest
->group
);
133 dest
->group
= EC_GROUP_new(meth
);
134 if (dest
->group
== NULL
)
136 if (!EC_GROUP_copy(dest
->group
, src
->group
))
139 /* copy the public key */
140 if (src
->pub_key
&& src
->group
)
143 EC_POINT_free(dest
->pub_key
);
144 dest
->pub_key
= EC_POINT_new(src
->group
);
145 if (dest
->pub_key
== NULL
)
147 if (!EC_POINT_copy(dest
->pub_key
, src
->pub_key
))
150 /* copy the private key */
153 if (dest
->priv_key
== NULL
)
155 dest
->priv_key
= BN_new();
156 if (dest
->priv_key
== NULL
)
159 if (!BN_copy(dest
->priv_key
, src
->priv_key
))
163 dest
->enc_flag
= src
->enc_flag
;
164 dest
->conv_form
= src
->conv_form
;
165 dest
->version
= src
->version
;
170 EC_KEY
*EC_KEY_dup(const EC_KEY
*eckey
)
178 /* copy the parameters */
181 ret
->group
= EC_GROUP_dup(eckey
->group
);
182 if (ret
->group
== NULL
)
185 /* copy the public key */
186 if (eckey
->pub_key
&& eckey
->group
)
188 ret
->pub_key
= EC_POINT_dup(eckey
->pub_key
, eckey
->group
);
189 if (ret
->pub_key
== NULL
)
192 /* copy the private key */
195 ret
->priv_key
= BN_dup(ret
->priv_key
);
196 if (ret
->priv_key
== NULL
)
200 ret
->enc_flag
= eckey
->enc_flag
;
201 ret
->conv_form
= eckey
->conv_form
;
202 ret
->version
= eckey
->version
;
213 int EC_KEY_generate_key(EC_KEY
*eckey
)
217 BIGNUM
*priv_key
= NULL
, *order
= NULL
;
218 EC_POINT
*pub_key
= NULL
;
220 if (!eckey
|| !eckey
->group
)
222 ECerr(EC_F_EC_KEY_GENERATE_KEY
, ERR_R_PASSED_NULL_PARAMETER
);
226 if ((order
= BN_new()) == NULL
) goto err
;
227 if ((ctx
= BN_CTX_new()) == NULL
) goto err
;
229 if (eckey
->priv_key
== NULL
)
232 if (priv_key
== NULL
)
236 priv_key
= eckey
->priv_key
;
238 if (!EC_GROUP_get_order(eckey
->group
, order
, ctx
))
242 if (!BN_rand_range(priv_key
, order
))
244 while (BN_is_zero(priv_key
));
246 if (eckey
->pub_key
== NULL
)
248 pub_key
= EC_POINT_new(eckey
->group
);
253 pub_key
= eckey
->pub_key
;
255 if (!EC_POINT_mul(eckey
->group
, pub_key
, priv_key
, NULL
, NULL
, ctx
))
258 eckey
->priv_key
= priv_key
;
259 eckey
->pub_key
= pub_key
;
266 if (pub_key
!= NULL
&& eckey
->pub_key
== NULL
)
267 EC_POINT_free(pub_key
);
268 if (priv_key
!= NULL
&& eckey
->priv_key
== NULL
)
275 int EC_KEY_check_key(const EC_KEY
*eckey
)
279 BIGNUM
*order
= NULL
;
280 EC_POINT
*point
= NULL
;
282 if (!eckey
|| !eckey
->group
|| !eckey
->pub_key
)
284 ECerr(EC_F_EC_KEY_CHECK_KEY
, ERR_R_PASSED_NULL_PARAMETER
);
288 if ((ctx
= BN_CTX_new()) == NULL
)
290 if ((order
= BN_new()) == NULL
)
292 if ((point
= EC_POINT_new(eckey
->group
)) == NULL
)
295 /* testing whether the pub_key is on the elliptic curve */
296 if (!EC_POINT_is_on_curve(eckey
->group
, eckey
->pub_key
, ctx
))
298 ECerr(EC_F_EC_KEY_CHECK_KEY
, EC_R_POINT_IS_NOT_ON_CURVE
);
301 /* testing whether pub_key * order is the point at infinity */
302 if (!EC_GROUP_get_order(eckey
->group
, order
, ctx
))
304 ECerr(EC_F_EC_KEY_CHECK_KEY
, EC_R_INVALID_GROUP_ORDER
);
307 if (!EC_POINT_copy(point
, eckey
->pub_key
))
309 ECerr(EC_F_EC_KEY_CHECK_KEY
, ERR_R_EC_LIB
);
312 if (!EC_POINT_mul(eckey
->group
, point
, order
, NULL
, NULL
, ctx
))
314 ECerr(EC_F_EC_KEY_CHECK_KEY
, ERR_R_EC_LIB
);
317 if (!EC_POINT_is_at_infinity(eckey
->group
, point
))
319 ECerr(EC_F_EC_KEY_CHECK_KEY
, EC_R_WRONG_ORDER
);
322 /* in case the priv_key is present :
323 * check if generator * priv_key == pub_key
327 if (BN_cmp(eckey
->priv_key
, order
) >= 0)
329 ECerr(EC_F_EC_KEY_CHECK_KEY
, EC_R_WRONG_ORDER
);
332 if (!EC_POINT_mul(eckey
->group
, point
, eckey
->priv_key
,
335 ECerr(EC_F_EC_KEY_CHECK_KEY
, ERR_R_EC_LIB
);
338 if (EC_POINT_cmp(eckey
->group
, point
, eckey
->pub_key
,
341 ECerr(EC_F_EC_KEY_CHECK_KEY
, EC_R_INVALID_PRIVATE_KEY
);
352 EC_POINT_free(point
);