130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
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ecdsa.c -- ECDSA key handling
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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 "logger.h"
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#include "ecdsa.h"
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#include "utils.h"
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// Get and set ECDSA keys
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//
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bool ecdsa_set_base64_public_key(ecdsa_t *ecdsa, const char *p) {
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*ecdsa = EC_KEY_new_by_curve_name(NID_secp521r1);
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if(!*ecdsa) {
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logger(DEBUG_ALWAYS, LOG_DEBUG, "EC_KEY_new_by_curve_name failed: %s", ERR_error_string(ERR_get_error(), NULL));
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return false;
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}
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int len = strlen(p);
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unsigned char pubkey[len / 4 * 3 + 3];
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const unsigned char *ppubkey = pubkey;
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len = b64decode(p, (char *)pubkey, len);
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if(!o2i_ECPublicKey(ecdsa, &ppubkey, len)) {
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logger(DEBUG_ALWAYS, LOG_DEBUG, "o2i_ECPublicKey failed: %s", ERR_error_string(ERR_get_error(), NULL));
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return false;
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}
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return true;
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}
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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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// Read PEM ECDSA keys
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bool ecdsa_read_pem_public_key(ecdsa_t *ecdsa, FILE *fp) {
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*ecdsa = PEM_read_EC_PUBKEY(fp, ecdsa, NULL, NULL);
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if(*ecdsa)
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return true;
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logger(DEBUG_ALWAYS, LOG_ERR, "Unable to read ECDSA public key: %s", ERR_error_string(ERR_get_error(), NULL));
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return false;
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}
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bool ecdsa_read_pem_private_key(ecdsa_t *ecdsa, FILE *fp) {
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*ecdsa = PEM_read_ECPrivateKey(fp, NULL, NULL, NULL);
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if(*ecdsa)
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return true;
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logger(DEBUG_ALWAYS, LOG_ERR, "Unable to read ECDSA private key: %s", ERR_error_string(ERR_get_error(), NULL));
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return false;
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}
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size_t ecdsa_size(ecdsa_t *ecdsa) {
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return ECDSA_size(*ecdsa);
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}
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// TODO: standardise output format?
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bool ecdsa_sign(ecdsa_t *ecdsa, const void *in, size_t len, void *sig) {
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unsigned int siglen = ECDSA_size(*ecdsa);
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unsigned char hash[SHA512_DIGEST_LENGTH];
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SHA512(in, len, hash);
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memset(sig, 0, siglen);
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if(!ECDSA_sign(0, hash, sizeof hash, sig, &siglen, *ecdsa)) {
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logger(DEBUG_ALWAYS, LOG_DEBUG, "ECDSA_sign() failed: %s", ERR_error_string(ERR_get_error(), NULL));
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return false;
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}
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return true;
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}
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bool ecdsa_verify(ecdsa_t *ecdsa, const void *in, size_t len, const void *sig) {
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unsigned int siglen = ECDSA_size(*ecdsa);
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unsigned char hash[SHA512_DIGEST_LENGTH];
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SHA512(in, len, hash);
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if(!ECDSA_verify(0, hash, sizeof hash, sig, siglen, *ecdsa)) {
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logger(DEBUG_ALWAYS, LOG_DEBUG, "ECDSA_verify() failed: %s", ERR_error_string(ERR_get_error(), NULL));
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return false;
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}
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return true;
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}
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bool ecdsa_active(ecdsa_t *ecdsa) {
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return *ecdsa;
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}
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void ecdsa_free(ecdsa_t *ecdsa) {
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if(*ecdsa) {
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EC_KEY_free(*ecdsa);
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*ecdsa = NULL;
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}
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}
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