Import Upstream version 1.1~pre3

src/ecdsa.c

@@ -0,0 +1,130 @@
+/*
+    ecdsa.c -- ECDSA key handling
+    Copyright (C) 2011-2012 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 "logger.h"
+#include "ecdsa.h"
+#include "utils.h"
+
+// Get and set ECDSA keys
+//
+bool ecdsa_set_base64_public_key(ecdsa_t *ecdsa, const char *p) {
+	*ecdsa = EC_KEY_new_by_curve_name(NID_secp521r1);
+	if(!*ecdsa) {
+		logger(DEBUG_ALWAYS, LOG_DEBUG, "EC_KEY_new_by_curve_name failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		return false;
+	}
+
+	int len = strlen(p);
+	unsigned char pubkey[len / 4 * 3 + 3];
+	const unsigned char *ppubkey = pubkey;
+	len = b64decode(p, (char *)pubkey, len);
+
+	if(!o2i_ECPublicKey(ecdsa, &ppubkey, len)) {
+		logger(DEBUG_ALWAYS, LOG_DEBUG, "o2i_ECPublicKey failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		return false;
+	}
+
+	return true;
+}
+
+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((char *)pubkey, base64, len);
+
+	free(pubkey);
+
+	return base64;
+}
+
+// Read PEM ECDSA keys
+
+bool ecdsa_read_pem_public_key(ecdsa_t *ecdsa, FILE *fp) {
+	*ecdsa = PEM_read_EC_PUBKEY(fp, ecdsa, NULL, NULL);
+
+	if(*ecdsa)
+		return true;
+
+	logger(DEBUG_ALWAYS, LOG_ERR, "Unable to read ECDSA public key: %s", ERR_error_string(ERR_get_error(), NULL));
+	return false;
+}
+
+bool ecdsa_read_pem_private_key(ecdsa_t *ecdsa, FILE *fp) {
+	*ecdsa = PEM_read_ECPrivateKey(fp, NULL, NULL, NULL);
+
+	if(*ecdsa)
+		return true;
+
+	logger(DEBUG_ALWAYS, LOG_ERR, "Unable to read ECDSA private key: %s", ERR_error_string(ERR_get_error(), NULL));
+	return false;
+}
+
+size_t ecdsa_size(ecdsa_t *ecdsa) {
+	return ECDSA_size(*ecdsa);
+}
+
+// TODO: standardise output format?
+
+bool ecdsa_sign(ecdsa_t *ecdsa, const void *in, size_t len, void *sig) {
+	unsigned int siglen = ECDSA_size(*ecdsa);
+
+	unsigned char hash[SHA512_DIGEST_LENGTH];
+	SHA512(in, len, hash);
+
+	memset(sig, 0, siglen);
+
+	if(!ECDSA_sign(0, hash, sizeof hash, sig, &siglen, *ecdsa)) {
+		logger(DEBUG_ALWAYS, LOG_DEBUG, "ECDSA_sign() failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		return false;
+	}
+
+	return true;
+}
+
+bool ecdsa_verify(ecdsa_t *ecdsa, const void *in, size_t len, const void *sig) {
+	unsigned int siglen = ECDSA_size(*ecdsa);
+
+	unsigned char hash[SHA512_DIGEST_LENGTH];
+	SHA512(in, len, hash);
+
+	if(!ECDSA_verify(0, hash, sizeof hash, sig, siglen, *ecdsa)) {
+		logger(DEBUG_ALWAYS, LOG_DEBUG, "ECDSA_verify() failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		return false;
+	}
+
+	return true;
+}
+
+bool ecdsa_active(ecdsa_t *ecdsa) {
+	return *ecdsa;
+}
+
+void ecdsa_free(ecdsa_t *ecdsa) {
+	if(*ecdsa) {
+		EC_KEY_free(*ecdsa);
+		*ecdsa = NULL;
+	}
+}