260 lines
6.6 KiB
C
260 lines
6.6 KiB
C
/* crypto/ecdsa/ecs_lib.c */
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/* ====================================================================
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* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <string.h>
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#include "ecs_locl.h"
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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#include <openssl/err.h>
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#include <openssl/bn.h>
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const char ECDSA_version[]="ECDSA" OPENSSL_VERSION_PTEXT;
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static const ECDSA_METHOD *default_ECDSA_method = NULL;
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static void *ecdsa_data_new(void);
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static void *ecdsa_data_dup(void *);
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static void ecdsa_data_free(void *);
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void ECDSA_set_default_method(const ECDSA_METHOD *meth)
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{
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default_ECDSA_method = meth;
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}
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const ECDSA_METHOD *ECDSA_get_default_method(void)
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{
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if(!default_ECDSA_method)
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default_ECDSA_method = ECDSA_OpenSSL();
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return default_ECDSA_method;
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}
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int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth)
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{
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ECDSA_DATA *ecdsa;
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ecdsa = ecdsa_check(eckey);
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if (ecdsa == NULL)
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return 0;
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#ifndef OPENSSL_NO_ENGINE
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if (ecdsa->engine)
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{
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ENGINE_finish(ecdsa->engine);
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ecdsa->engine = NULL;
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}
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#endif
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ecdsa->meth = meth;
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return 1;
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}
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static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine)
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{
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ECDSA_DATA *ret;
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ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA));
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if (ret == NULL)
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{
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ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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return(NULL);
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}
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ret->init = NULL;
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ret->meth = ECDSA_get_default_method();
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ret->engine = engine;
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#ifndef OPENSSL_NO_ENGINE
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if (!ret->engine)
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ret->engine = ENGINE_get_default_ECDSA();
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if (ret->engine)
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{
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ret->meth = ENGINE_get_ECDSA(ret->engine);
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if (!ret->meth)
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{
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ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
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ENGINE_finish(ret->engine);
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OPENSSL_free(ret);
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return NULL;
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}
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}
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#endif
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ret->flags = ret->meth->flags;
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CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
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#if 0
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if ((ret->meth->init != NULL) && !ret->meth->init(ret))
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{
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CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
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OPENSSL_free(ret);
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ret=NULL;
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}
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#endif
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return(ret);
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}
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static void *ecdsa_data_new(void)
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{
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return (void *)ECDSA_DATA_new_method(NULL);
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}
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static void *ecdsa_data_dup(void *data)
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{
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ECDSA_DATA *r = (ECDSA_DATA *)data;
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/* XXX: dummy operation */
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if (r == NULL)
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return NULL;
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return ecdsa_data_new();
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}
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static void ecdsa_data_free(void *data)
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{
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ECDSA_DATA *r = (ECDSA_DATA *)data;
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#ifndef OPENSSL_NO_ENGINE
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if (r->engine)
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ENGINE_finish(r->engine);
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#endif
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CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);
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OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));
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OPENSSL_free(r);
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}
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ECDSA_DATA *ecdsa_check(EC_KEY *key)
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{
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ECDSA_DATA *ecdsa_data;
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void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
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ecdsa_data_free, ecdsa_data_free);
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if (data == NULL)
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{
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ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
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if (ecdsa_data == NULL)
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return NULL;
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EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
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ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free);
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}
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else
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ecdsa_data = (ECDSA_DATA *)data;
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return ecdsa_data;
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}
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int ECDSA_size(const EC_KEY *r)
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{
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int ret,i;
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ASN1_INTEGER bs;
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BIGNUM *order=NULL;
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unsigned char buf[4];
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const EC_GROUP *group;
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if (r == NULL)
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return 0;
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group = EC_KEY_get0_group(r);
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if (group == NULL)
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return 0;
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if ((order = BN_new()) == NULL) return 0;
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if (!EC_GROUP_get_order(group,order,NULL))
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{
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BN_clear_free(order);
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return 0;
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}
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i=BN_num_bits(order);
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bs.length=(i+7)/8;
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bs.data=buf;
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bs.type=V_ASN1_INTEGER;
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/* If the top bit is set the asn1 encoding is 1 larger. */
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buf[0]=0xff;
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i=i2d_ASN1_INTEGER(&bs,NULL);
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i+=i; /* r and s */
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ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
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BN_clear_free(order);
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return(ret);
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}
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int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
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CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
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{
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return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,
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new_func, dup_func, free_func);
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}
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int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)
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{
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ECDSA_DATA *ecdsa;
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ecdsa = ecdsa_check(d);
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if (ecdsa == NULL)
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return 0;
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return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg));
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}
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void *ECDSA_get_ex_data(EC_KEY *d, int idx)
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{
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ECDSA_DATA *ecdsa;
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ecdsa = ecdsa_check(d);
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if (ecdsa == NULL)
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return NULL;
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return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx));
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}
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