encrypted_payload: Encrypted payload can be constructed from plaintext

src/libcharon/encoding/payloads/encrypted_payload.c

@@ -585,6 +585,16 @@ METHOD(encrypted_payload_t, decrypt, status_t,
 	return parse(this, plain);
 }
 
+METHOD(encrypted_payload_t, decrypt_plain, status_t,
+	private_encrypted_payload_t *this, chunk_t assoc)
+{
+	if (!this->encrypted.ptr)
+	{
+		return FAILED;
+	}
+	return parse(this, this->encrypted);
+}
+
 METHOD(encrypted_payload_t, decrypt_v1, status_t,
 	private_encrypted_payload_t *this, chunk_t iv)
 {
@@ -671,3 +681,20 @@ encrypted_payload_t *encrypted_payload_create(payload_type_t type)
 
 	return &this->public;
 }
+
+/*
+ * Described in header
+ */
+encrypted_payload_t *encrypted_payload_create_from_plain(payload_type_t next,
+														 chunk_t plain)
+{
+	private_encrypted_payload_t *this;
+
+	this = (private_encrypted_payload_t*)encrypted_payload_create(PLV2_ENCRYPTED);
+	this->public.decrypt = _decrypt_plain;
+	this->next_payload = next;
+	this->encrypted = plain;
+	compute_length(this);
+
+	return &this->public;
+}

src/libcharon/encoding/payloads/encrypted_payload.h

@@ -118,4 +118,15 @@ struct encrypted_payload_t {
  */
 encrypted_payload_t *encrypted_payload_create(payload_type_t type);
 
+/**
+ * Creates an encrypted payload with the given plain text data and next payload
+ * type.
+ *
+ * @param next		next payload type
+ * @param plain		plaintext data (gets adopted)
+ * @return			encrypted_payload_t object
+ */
+encrypted_payload_t *encrypted_payload_create_from_plain(payload_type_t next,
+														 chunk_t plain);
+
 #endif /** ENCRYPTED_PAYLOAD_H_ @}*/