diff --git a/src/libstrongswan/asn1/asn1.c b/src/libstrongswan/asn1/asn1.c
index ef1dd9eaa..cf684e720 100644
--- a/src/libstrongswan/asn1/asn1.c
+++ b/src/libstrongswan/asn1/asn1.c
@@ -648,18 +648,27 @@ int asn1_parse_algorithmIdentifier(chunk_t blob, int level0, chunk_t *parameters
 
 	if (asn1_unwrap(&blob, &blob) == ASN1_SEQUENCE)
 	{
-		DBG2(DBG_ASN, "L%d - algorithmIdentifier:", level0);
+		if (level0 >= 0)
+		{
+			DBG2(DBG_ASN, "L%d - algorithmIdentifier:", level0);
+		}
 
 		if (asn1_unwrap(&blob, &object) == ASN1_OID)
 		{
-			DBG2(DBG_ASN, "L%d - algorithm:", level0+1);
-			asn1_debug_simple_object(object, ASN1_OID, FALSE);
+			if (level0 >= 0)
+			{
+				DBG2(DBG_ASN, "L%d - algorithm:", level0+1);
+				asn1_debug_simple_object(object, ASN1_OID, FALSE);
+			}
 			alg = asn1_known_oid(object);
 
 			if (blob.len)
 			{
-				DBG2(DBG_ASN, "L%d - parameters:", level0+1);
-				DBG3(DBG_ASN, "%B", &blob);
+				if (level0 >= 0)
+				{
+					DBG2(DBG_ASN, "L%d - parameters:", level0+1);
+					DBG3(DBG_ASN, "%B", &blob);
+				}
 				if (parameters)
 				{
 					*parameters = blob;
diff --git a/src/libstrongswan/asn1/asn1.h b/src/libstrongswan/asn1/asn1.h
index cb5d86c5c..a94c82e30 100644
--- a/src/libstrongswan/asn1/asn1.h
+++ b/src/libstrongswan/asn1/asn1.h
@@ -163,7 +163,7 @@ int asn1_unwrap(chunk_t *blob, chunk_t *content);
  * Parses an ASN.1 algorithmIdentifier object
  *
  * @param blob		ASN.1 coded blob
- * @param level0	top-most level offset
+ * @param level0	top-most level offset (-1 to suppress log messages)
  * @param params	returns optional [ASN.1 coded] parameters
  * @return			known OID index or OID_UNKNOWN
  */
diff --git a/src/libstrongswan/tests/suites/test_asn1.c b/src/libstrongswan/tests/suites/test_asn1.c
index 7cedf8e0f..fc207355d 100644
--- a/src/libstrongswan/tests/suites/test_asn1.c
+++ b/src/libstrongswan/tests/suites/test_asn1.c
@@ -81,11 +81,11 @@ START_TEST(test_asn1_parse_algorithmIdentifier)
 		parameters = chunk_empty;
 		if (i == 2)
 		{
-			alg = asn1_parse_algorithmIdentifier(algid, 0, NULL);
+			alg = asn1_parse_algorithmIdentifier(algid, _i, NULL);
 		}
 		else
 		{
-			alg = asn1_parse_algorithmIdentifier(algid, 0, &parameters);
+			alg = asn1_parse_algorithmIdentifier(algid, _i, &parameters);
 			if (test[i].empty)
 			{
 				ck_assert(parameters.len == 0 && parameters.ptr == NULL);
@@ -824,7 +824,7 @@ Suite *asn1_suite_create()
 	suite_add_tcase(s, tc);
 
 	tc = tcase_create("parse_algorithmIdentifier");
-	tcase_add_test(tc, test_asn1_parse_algorithmIdentifier);
+	tcase_add_loop_test(tc, test_asn1_parse_algorithmIdentifier, -1, 1);
 	suite_add_tcase(s, tc);
 
 	tc = tcase_create("known_oid");