fixed compiler warnings on 64bit

src/libstrongswan/crypto/rngs/rng.h

@@ -56,7 +56,7 @@ struct rng_t {
 	 * @param len		number of bytes to get
 	 * @param buffer	pointer where the generated bytes will be written
 	 */
-	void (*get_bytes) (rng_t *this, u_int len, u_int8_t *buffer);
+	void (*get_bytes) (rng_t *this, size_t len, u_int8_t *buffer);
 	
 	/**
 	 * Generates random bytes and allocate space for them.
@@ -64,7 +64,7 @@ struct rng_t {
 	 * @param len		number of bytes to get
 	 * @param chunk		chunk which will hold generated bytes
 	 */
-	void (*allocate_bytes) (rng_t *this, u_int len, chunk_t *chunk);
+	void (*allocate_bytes) (rng_t *this, size_t len, chunk_t *chunk);
 	
 	/**
 	 * Destroys a rng object.