protected byte[] decrypt(byte[] encrypted) {
        byte[] serialized = encrypted;
        CipherService cipherService = getCipherService();
        if (cipherService != null) {
            ByteSourceBroker broker = cipherService.decrypt(encrypted, getDecryptionCipherKey());
            serialized = broker.getClonedBytes();
        }
        return serialized;
    }
Decrypts the byte array using the configured {@link #getCipherService() cipherService}.

@param encrypted the encrypted byte array to decrypt
@return the decrypted byte array returned by the configured {@link #getCipherService () cipher}.
core/src/main/java/org/apache/shiro/mgt/AbstractRememberMeManager.java