From: Guus Sliepen <guus@tinc-vpn.org>
Date: Thu, 7 Jul 2011 20:27:17 +0000 (+0200)
Subject: Implement ECDSA sign and verify operations.
X-Git-Tag: release-1.1pre2~24
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=03582eb669494cb778ebea7b0fe3b1b841335750;p=oweals%2Ftinc.git

Implement ECDSA sign and verify operations.

Very basic at the moment, doesn't hash the input first,
and uses OpenSSL's DER encoded signature as output.
---

diff --git a/src/openssl/ecdsa.c b/src/openssl/ecdsa.c
index 84fe8fd..000bfaa 100644
--- a/src/openssl/ecdsa.c
+++ b/src/openssl/ecdsa.c
@@ -70,12 +70,31 @@ size_t ecdsa_size(ecdsa_t *ecdsa) {
 	return ECDSA_size(*ecdsa);
 }
 
+// TODO: hash first, standardise output format?
+
 bool ecdsa_sign(ecdsa_t *ecdsa, const void *in, size_t len, void *sig) {
-	logger(LOG_ERR, "Unable to perform ECDSA signature: %s", ERR_error_string(ERR_get_error(), NULL));
-	return false;	
+	unsigned int siglen = ECDSA_size(*ecdsa);
+	memset(sig, 0, siglen);
+
+	if(!ECDSA_sign(0, in, len, sig, &siglen, *ecdsa)) {
+		logger(LOG_DEBUG, "ECDSA_sign() failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		return false;
+	}
+
+	if(siglen != ECDSA_size(*ecdsa)) {
+		logger(LOG_ERR, "Signature length %d != %d", siglen, ECDSA_size(*ecdsa));
+	}
+
+	return true;
 }
 
 bool ecdsa_verify(ecdsa_t *ecdsa, const void *in, size_t len, const void *sig) {
-	logger(LOG_ERR, "Unable to perform ECDSA verification: %s", ERR_error_string(ERR_get_error(), NULL));
-	return false;	
+	unsigned int siglen = ECDSA_size(*ecdsa);
+
+	if(!ECDSA_verify(0, in, len, sig, siglen, *ecdsa)) {
+		logger(LOG_DEBUG, "ECDSA_verify() failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		return false;
+	}
+
+	return true;
 }