crypto/src/main/java/org/springframework/security/crypto/encrypt/CipherUtils.java
public static void initCipher(Cipher cipher, int mode, SecretKey secretKey) {
		initCipher(cipher, mode, secretKey, null);
	}
public static void initCipher(Cipher cipher, int mode, SecretKey secretKey) {
		initCipher(cipher, mode, secretKey, null);
	}
Initializes the Cipher for use.