75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*
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ecdsagen.c -- ECDSA key generation and export
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Copyright (C) 2011 Guus Sliepen <guus@tinc-vpn.org>
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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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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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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "system.h"
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#include <openssl/obj_mac.h>
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#include "ecdsagen.h"
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#include "utils.h"
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// Generate ECDSA key
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bool ecdsa_generate(ecdsa_t *ecdsa) {
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*ecdsa = EC_KEY_new_by_curve_name(NID_secp521r1);
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if(!EC_KEY_generate_key(*ecdsa)) {
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fprintf(stderr, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
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return false;
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}
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EC_KEY_set_asn1_flag(*ecdsa, OPENSSL_EC_NAMED_CURVE);
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EC_KEY_set_conv_form(*ecdsa, POINT_CONVERSION_COMPRESSED);
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return true;
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}
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// Write PEM ECDSA keys
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bool ecdsa_write_pem_public_key(ecdsa_t *ecdsa, FILE *fp) {
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BIO *out = BIO_new(BIO_s_file());
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BIO_set_fp(out,fp,BIO_NOCLOSE);
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PEM_write_bio_EC_PUBKEY(out, *ecdsa);
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BIO_free(out);
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return true;
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}
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bool ecdsa_write_pem_private_key(ecdsa_t *ecdsa, FILE *fp) {
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BIO *out = BIO_new(BIO_s_file());
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BIO_set_fp(out,fp,BIO_NOCLOSE);
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PEM_write_bio_ECPrivateKey(out, *ecdsa, NULL, NULL, 0, NULL, NULL);
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BIO_free(out);
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return true;
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}
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// Convert ECDSA public key to base64 format
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char *ecdsa_get_base64_public_key(ecdsa_t *ecdsa) {
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unsigned char *pubkey = NULL;
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int len = i2o_ECPublicKey(*ecdsa, &pubkey);
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char *base64 = malloc(len * 4 / 3 + 5);
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b64encode((char *)pubkey, base64, len);
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free(pubkey);
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return base64;
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}
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