/*
* Copyright (C)2009 - SSHJ Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.schmizz.sshj.transport.cipher;
/** Wrapper for a cryptographic cipher, used either for encryption or decryption. */
public interface Cipher {
enum Mode {
Encrypt,
Decrypt
}
/** @return the block size for this cipher */
int getBlockSize();
/** @return the size of the initialization vector */
int getIVSize();
/**
* Initialize the cipher for encryption or decryption with the given private key and initialization vector
*
* @param mode whether this instance wil encrypt or decrypt
* @param key the key for the cipher
* @param iv initialization vector
*/
void init(Mode mode, byte[] key, byte[] iv);
/**
* Performs in-place encryption or decryption on the given data.
*
* @param input the subject
* @param inputOffset offset at which to start
* @param inputLen number of bytes starting at {@code inputOffset}
*/
void update(byte[] input, int inputOffset, int inputLen);
}