public ByteSourceBroker decrypt(byte[] ciphertext, byte[] key) throws CryptoException {
        return new SimpleByteSourceBroker(this, ciphertext, key);
    }
Returns the transformation string to use with the {@link javax.crypto.Cipher#getInstance} invocation when
creating a new {@code Cipher} instance.  This default implementation always returns
{@link #getAlgorithmName() getAlgorithmName()}.  Block cipher implementations will want to override this method
to support appending cipher operation modes and padding schemes.

@param streaming if the transformation string is going to be used for a Cipher for stream-based encryption or not.
@return the transformation string to use with the {@link javax.crypto.Cipher#getInstance} invocation when
        creating a new {@code Cipher} instance.
src/main/java/org/apache/shiro/crypto/cipher/JcaCipherService.java