139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/* Cryptic -- Cryptographic tools and protocols
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* Copyright (C) 2009 Mikaël Ates <mates@entrouvert.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <openssl/bn.h>
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#include <string.h>
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#include "../../errors.h"
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#include "../../utils.h"
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#include "commitments_utils.h"
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BIGNUM*
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cryptic_get_dlrep(int nb_quantities, BIGNUM **quantities,BIGNUM **bases,BIGNUM *modulus)
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{
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int rc = CRYPTIC_ERROR_UNDEFINED;
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int j;
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BIGNUM *ret = NULL, *tmp = NULL;
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BN_CTX *ctx = NULL;
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goto_cleanup_if_fail(modulus != NULL && quantities != NULL && bases != NULL);
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for(j=0; j<nb_quantities; j++){
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goto_cleanup_if_fail(bases[j] != NULL);
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goto_cleanup_if_fail(quantities[j] != NULL);
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}
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goto_cleanup_if_fail_with_rc_with_warning_openssl(ret = BN_new());
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goto_cleanup_if_fail_with_rc_with_warning_openssl(tmp = BN_new());
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goto_cleanup_if_fail_with_rc_with_warning_openssl(BN_set_word(ret,1) == 1);
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goto_cleanup_if_fail_with_rc_with_warning_openssl(ctx = BN_CTX_new());
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for(j=0; j<nb_quantities; j++){
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goto_cleanup_if_fail_with_rc_with_warning_openssl(BN_mod_exp(tmp,bases[j],quantities[j],modulus,ctx) == 1);
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goto_cleanup_if_fail_with_rc_with_warning_openssl(BN_mod_mul(ret,ret,tmp,modulus,ctx) == 1);
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}
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rc = CRYPTIC_NO_ERROR;
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cleanup:
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cryptic_release_ctx(ctx);
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cryptic_release_bn(tmp);
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if(rc != CRYPTIC_NO_ERROR){
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cryptic_release_bn(ret);
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return NULL;
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}
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return ret;
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}
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BIGNUM* cryptic_inv_mod(BIGNUM* value, BIGNUM* modulus)
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{
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int rc = CRYPTIC_ERROR_UNDEFINED;
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if(!modulus || !value) return NULL;
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BIGNUM *ret = NULL, *tmp = NULL;
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BN_CTX *ctx = NULL;
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goto_cleanup_if_fail_with_rc_with_warning_openssl(ret = BN_new());
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goto_cleanup_if_fail_with_rc_with_warning_openssl(tmp = BN_new());
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goto_cleanup_if_fail_with_rc_with_warning_openssl(ctx = BN_CTX_new());
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goto_cleanup_if_fail_with_rc_with_warning_openssl(BN_gcd(tmp, modulus, value, ctx) == 1);
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goto_cleanup_if_fail(BN_ucmp(tmp, BN_value_one()) == 0); /* Not inversible */
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goto_cleanup_if_fail_with_rc_with_warning_openssl(BN_mod_inverse(ret,value,modulus,ctx));
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rc = CRYPTIC_NO_ERROR;
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cleanup:
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cryptic_release_ctx(ctx);
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cryptic_release_bn(tmp);
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if(rc != CRYPTIC_NO_ERROR){
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cryptic_release_bn(ret);
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return NULL;
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}
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return ret;
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}
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int cryptic_cmp_bn(BIGNUM* value1, BIGNUM* value2)
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{
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if(!value1 || !value2) return -1;
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if(BN_ucmp(value1,value2) == 0)
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return 1;
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else
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return 0;
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}
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BIGNUM*
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cryptic_char_to_bn(char* value)
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{
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if(!value || value[0]==0) return NULL;
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BIGNUM *ret = NULL;
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if(!(ret = BN_new())) return NULL;
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BN_bin2bn((const unsigned char *) value,strlen(value),ret);
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return ret;
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}
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BIGNUM*
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cryptic_int_to_bn(int value)
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{
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int rc = CRYPTIC_ERROR_UNDEFINED;
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BIGNUM *ret = NULL;
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goto_cleanup_if_fail_with_rc_with_warning_openssl(ret = BN_new());
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if(value < 0){
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goto_cleanup_if_fail_with_rc_with_warning_openssl(BN_set_word(ret,abs(value)) == 1);
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BN_set_negative(ret,1);
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}else{
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goto_cleanup_if_fail_with_rc_with_warning_openssl(BN_set_word(ret,value) == 1);
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}
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rc = CRYPTIC_NO_ERROR;
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cleanup:
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if(rc != CRYPTIC_NO_ERROR){
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cryptic_release_bn(ret);
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return NULL;
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}
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return ret;
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}
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