added function certreq_payload_create_from_x509()

src/charon/encoding/payloads/certreq_payload.c

@@ -258,3 +258,16 @@ certreq_payload_t *certreq_payload_create()
 
 	return (&(this->public));
 }
+
+/*
+ * Described in header
+ */
+certreq_payload_t *certreq_payload_create_from_x509(x509_t *cert)
+{
+	certreq_payload_t *this = certreq_payload_create();
+	rsa_public_key_t *pubkey = cert->get_public_key(cert);
+
+	this->set_cert_encoding(this, CERT_X509_SIGNATURE);
+	this->set_data(this, pubkey->get_keyid(pubkey));
+	return this;
+}

src/charon/encoding/payloads/certreq_payload.h

@@ -122,5 +122,14 @@ struct certreq_payload_t {
  */
 certreq_payload_t *certreq_payload_create(void);
 
+/**
+ * @brief Creates a certreq_payload_t object from a X.509 CA certificate.
+ * 
+ * @param cert				X.509 CA certificate
+ * @return					certreq_payload_t object
+ * 
+ * @ingroup payloads
+ */
+certreq_payload_t *certreq_payload_create_from_x509(x509_t *cert);
 
 #endif /* CERTREQ_PAYLOAD_H_ */