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Add ECDSA key generation.

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This commit is contained in:
Guus Sliepen 2011-07-03 22:15:00 +02:00
parent 1d92dd62a7
commit 8ace7f3e57
3 changed files with 108 additions and 2 deletions
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src/openssl/ecdsagen.c Normal file
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/*
ecdsagen.c -- ECDSA key generation and export
Copyright (C) 2008 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/obj_mac.h>
#include "logger.h"
#include "ecdsagen.h"
#include "utils.h"
// Generate ECDSA key
bool ecdsa_generate(ecdsa_t *ecdsa) {
*ecdsa = EC_KEY_new_by_curve_name(NID_secp521r1);
if(!EC_KEY_generate_key(*ecdsa)) {
logger(LOG_ERR, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
abort();
}
EC_KEY_set_asn1_flag(*ecdsa, OPENSSL_EC_NAMED_CURVE);
EC_KEY_set_conv_form(*ecdsa, POINT_CONVERSION_COMPRESSED);
return true;
}
// Write PEM ECDSA keys
bool ecdsa_write_pem_public_key(ecdsa_t *ecdsa, FILE *fp) {
BIO *out = BIO_new(BIO_s_file());
BIO_set_fp(out,fp,BIO_NOCLOSE);
PEM_write_bio_EC_PUBKEY(out, *ecdsa);
BIO_free(out);
return true;
}
bool ecdsa_write_pem_private_key(ecdsa_t *ecdsa, FILE *fp) {
BIO *out = BIO_new(BIO_s_file());
BIO_set_fp(out,fp,BIO_NOCLOSE);
PEM_write_bio_ECPrivateKey(out, *ecdsa, NULL, NULL, 0, NULL, NULL);
BIO_free(out);
return true;
}
// Convert ECDSA public key to base64 format
char *ecdsa_get_base64_public_key(ecdsa_t *ecdsa) {
unsigned char *pubkey = NULL;
int len = i2o_ECPublicKey(*ecdsa, &pubkey);
char *base64 = malloc(len * 4 / 3 + 5);
b64encode(pubkey, base64, len);
free(pubkey);
return base64;
}

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/*
ecdsagen.h -- ECDSA key generation and export
Copyright (C) 2011 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __TINC_ECDSAGEN_H__
#define __TINC_ECDSAGEN_H__
#include "ecdsa.h"
extern bool ecdsa_generate(ecdsa_t *ecdsa);
extern bool ecdsa_write_pem_public_key(ecdsa_t *ecdsa, FILE *fp);
extern bool ecdsa_write_pem_private_key(ecdsa_t *ecdsa, FILE *fp);
extern char *ecdsa_get_base64_public_key(ecdsa_t *ecdsa);
#endif