asn1: Add helper function to create algorithmIdentifier with parameters

src/libstrongswan/asn1/asn1.c

@@ -33,7 +33,15 @@ const chunk_t ASN1_INTEGER_1 = chunk_from_chars(0x02, 0x01, 0x01);
 const chunk_t ASN1_INTEGER_2 = chunk_from_chars(0x02, 0x01, 0x02);
 
 /*
- * Defined in header.
+ * Described in header
+ */
+chunk_t asn1_algorithmIdentifier_params(int oid, chunk_t params)
+{
+	return asn1_wrap(ASN1_SEQUENCE, "mm", asn1_build_known_oid(oid), params);
+}
+
+/*
+ * Described in header
  */
 chunk_t asn1_algorithmIdentifier(int oid)
 {
@@ -55,7 +63,7 @@ chunk_t asn1_algorithmIdentifier(int oid)
 			parameters = asn1_simple_object(ASN1_NULL, chunk_empty);
 			break;
 	}
-	return asn1_wrap(ASN1_SEQUENCE, "mm", asn1_build_known_oid(oid), parameters);
+	return asn1_algorithmIdentifier_params(oid, parameters);
 }
 
 /*

src/libstrongswan/asn1/asn1.h

@@ -1,8 +1,8 @@
 /*
+ * Copyright (C) 2011-2017 Tobias Brunner
  * Copyright (C) 2006 Martin Will
  * Copyright (C) 2000-2008 Andreas Steffen
- *
- * Hochschule fuer Technik Rapperswil
+ * HSR Hochschule fuer Technik Rapperswil
  *
  * 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
@@ -92,13 +92,22 @@ extern const chunk_t ASN1_INTEGER_2;
 /** Some ASN.1 analysis functions */
 
 /**
- * Build an algorithmIdentifier from a known OID.
+ * Build an algorithmIdentifier from a known OID with empty parameters.
  *
  * @param oid		known OID index
- * @return			body of the corresponding OID, allocated
+ * @return			body of the corresponding ASN.1 structure, allocated
  */
 chunk_t asn1_algorithmIdentifier(int oid);
 
+/**
+ * Build an algorithmIdentifier from a known OID and the given prameters.
+ *
+ * @param oid		known OID index
+ * @param params	parameters to encode in the algorithmIdentifier (adopted)
+ * @return			body of the corresponding ASN.1 structure, allocated
+ */
+chunk_t asn1_algorithmIdentifier_params(int oid, chunk_t params);
+
 /**
  * Converts an ASN.1 OID into a known OID index
  *