1 /* Written by Dr Stephen N Henson (steve@openssl.org) 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/asn1t.h>
61 #include <openssl/x509.h>
62 #include <openssl/ec.h>
63 #include <openssl/ecdsa.h>
64 #include <openssl/evp.h>
67 /* EC pkey context structure */
71 /* Key and paramgen group */
77 static int pkey_ec_init(EVP_PKEY_CTX *ctx)
80 dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
83 dctx->gen_group = NULL;
91 static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
93 EC_PKEY_CTX *dctx, *sctx;
94 if (!pkey_ec_init(dst))
100 dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
101 if (!dctx->gen_group)
108 static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
110 EC_PKEY_CTX *dctx = ctx->data;
114 EC_GROUP_free(dctx->gen_group);
119 static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
120 const unsigned char *tbs, size_t tbslen)
124 EC_PKEY_CTX *dctx = ctx->data;
125 EC_KEY *ec = ctx->pkey->pkey.ec;
129 *siglen = ECDSA_size(ec);
132 else if(*siglen < (size_t)ECDSA_size(ec))
134 ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
139 type = EVP_MD_type(dctx->md);
144 ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
148 *siglen = (size_t)sltmp;
152 static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
153 const unsigned char *sig, size_t siglen,
154 const unsigned char *tbs, size_t tbslen)
157 EC_PKEY_CTX *dctx = ctx->data;
158 EC_KEY *ec = ctx->pkey->pkey.ec;
161 type = EVP_MD_type(dctx->md);
165 ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
170 static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
174 const EC_POINT *pubkey = NULL;
175 if (!ctx->pkey || !ctx->peerkey)
177 ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
183 const EC_GROUP *group;
184 group = EC_KEY_get0_group(ctx->pkey->pkey.ec);
185 *keylen = (EC_GROUP_get_degree(group) + 7)/8;
189 pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
191 /* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is
192 * not an error, the result is truncated.
197 ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0);
204 static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
206 EC_PKEY_CTX *dctx = ctx->data;
210 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
211 group = EC_GROUP_new_by_curve_name(p1);
214 ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
218 EC_GROUP_free(dctx->gen_group);
219 dctx->gen_group = group;
222 case EVP_PKEY_CTRL_MD:
223 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
224 EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
225 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
226 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
227 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
228 EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
230 ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
236 case EVP_PKEY_CTRL_PEER_KEY:
237 /* Default behaviour is OK */
238 case EVP_PKEY_CTRL_DIGESTINIT:
239 case EVP_PKEY_CTRL_PKCS7_SIGN:
240 case EVP_PKEY_CTRL_CMS_SIGN:
249 static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
250 const char *type, const char *value)
252 if (!strcmp(type, "ec_paramgen_curve"))
255 nid = OBJ_sn2nid(value);
256 if (nid == NID_undef)
257 nid = OBJ_ln2nid(value);
258 if (nid == NID_undef)
260 ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
263 return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
268 static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
271 EC_PKEY_CTX *dctx = ctx->data;
273 if (dctx->gen_group == NULL)
275 ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
281 ret = EC_KEY_set_group(ec, dctx->gen_group);
283 EVP_PKEY_assign_EC_KEY(pkey, ec);
289 static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
292 if (ctx->pkey == NULL)
294 ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
300 EVP_PKEY_assign_EC_KEY(pkey, ec);
301 /* Note: if error return, pkey is freed by parent routine */
302 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
304 return EC_KEY_generate_key(pkey->pkey.ec);
307 const EVP_PKEY_METHOD ec_pkey_meth =