X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fopenssl%2Fprf.c;h=ddad522f71814db7045efddf32808fc6f749cb0b;hb=cfc9fee931c70554353ce6c4acc3407baac08745;hp=62770859593559859ae934b61679b47c89e61e38;hpb=2c6b2d70e6640f39563ad7bb0aa0ba87f883848c;p=tinc

diff --git a/src/openssl/prf.c b/src/openssl/prf.c
index 62770859..ddad522f 100644
--- a/src/openssl/prf.c
+++ b/src/openssl/prf.c
@@ -30,39 +30,40 @@
  */
 
 static bool prf_xor(int nid, const uint8_t *secret, size_t secretlen, uint8_t *seed, size_t seedlen, uint8_t *out, size_t outlen) {
-	digest_t *digest = digest_open_by_nid(nid, DIGEST_ALGO_SIZE);
+	digest_t digest = {0};
 
-	if(!digest) {
+	if(!digest_open_by_nid(&digest, nid, DIGEST_ALGO_SIZE)) {
+		digest_close(&digest);
 		return false;
 	}
 
-	if(!digest_set_key(digest, secret, secretlen)) {
-		digest_close(digest);
+	if(!digest_set_key(&digest, secret, secretlen)) {
+		digest_close(&digest);
 		return false;
 	}
 
-	size_t len = digest_length(digest);
+	size_t len = digest_length(&digest);
 
 	/* Data is what the "inner" HMAC function processes.
 	   It consists of the previous HMAC result plus the seed.
 	 */
 
-	char data[len + seedlen];
+	char *data = alloca(len + seedlen);
 	memset(data, 0, len);
 	memcpy(data + len, seed, seedlen);
 
-	uint8_t hash[len];
+	uint8_t *hash = alloca(len);
 
 	while(outlen > 0) {
 		/* Inner HMAC */
-		if(!digest_create(digest, data, len + seedlen, data)) {
-			digest_close(digest);
+		if(!digest_create(&digest, data, len + seedlen, data)) {
+			digest_close(&digest);
 			return false;
 		}
 
 		/* Outer HMAC */
-		if(!digest_create(digest, data, len + seedlen, hash)) {
-			digest_close(digest);
+		if(!digest_create(&digest, data, len + seedlen, hash)) {
+			digest_close(&digest);
 			return false;
 		}
 
@@ -76,7 +77,7 @@ static bool prf_xor(int nid, const uint8_t *secret, size_t secretlen, uint8_t *s
 		outlen -= i;
 	}
 
-	digest_close(digest);
+	digest_close(&digest);
 	return true;
 }