/*
* Copyright 2004-2023 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.security;
/**
* A block cipher is a data encryption algorithm that operates on blocks.
*/
public interface BlockCipher {
/**
* Blocks sizes are always multiples of this number.
*/
int ALIGN = 16;
/**
* Set the encryption key used for encrypting and decrypting.
* The key needs to be 16 bytes long.
*
* @param key the key
*/
void setKey(byte[] key);
/**
* Encrypt a number of bytes. This is done in-place, that
* means the bytes are overwritten.
*
* @param bytes the byte array
* @param off the start index
* @param len the number of bytes to encrypt
*/
void encrypt(byte[] bytes, int off, int len);
/**
* Decrypt a number of bytes. This is done in-place, that
* means the bytes are overwritten.
*
* @param bytes the byte array
* @param off the start index
* @param len the number of bytes to decrypt
*/
void decrypt(byte[] bytes, int off, int len);
/**
* Get the length of the key in bytes.
*
* @return the length of the key
*/
int getKeyLength();
}