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package com.sun.crypto.provider;

import java.security.InvalidKeyException;

This abstract class represents the core of all block ciphers. It allows to initialize the cipher and encrypt/decrypt single blocks. Larger quantities are handled by modes, which are subclasses of FeedbackCipher.
Author:Gigi Ankeny, Jan Luehe
See Also:
/** * This abstract class represents the core of all block ciphers. It allows to * initialize the cipher and encrypt/decrypt single blocks. Larger quantities * are handled by modes, which are subclasses of FeedbackCipher. * * @author Gigi Ankeny * @author Jan Luehe * * * @see AESCrypt * @see DESCrypt * @see DESedeCrypt * @see BlowfishCrypt * @see FeedbackCipher */
abstract class SymmetricCipher { SymmetricCipher() { // empty }
Retrieves this cipher's block size.
Returns:the block size of this cipher
/** * Retrieves this cipher's block size. * * @return the block size of this cipher */
abstract int getBlockSize();
Initializes the cipher in the specified mode with the given key.
Params:
  • decrypting – flag indicating encryption or decryption
  • algorithm – the algorithm name
  • key – the key
Throws:
/** * Initializes the cipher in the specified mode with the given key. * * @param decrypting flag indicating encryption or decryption * @param algorithm the algorithm name * @param key the key * * @exception InvalidKeyException if the given key is inappropriate for * initializing this cipher */
abstract void init(boolean decrypting, String algorithm, byte[] key) throws InvalidKeyException;
Encrypt one cipher block.

The input plain, starting at plainOffset and ending at (plainOffset+blockSize-1), is encrypted. The result is stored in cipher, starting at cipherOffset.

Params:
  • plain – the input buffer with the data to be encrypted
  • plainOffset – the offset in plain
  • cipher – the buffer for the encryption result
  • cipherOffset – the offset in cipher
/** * Encrypt one cipher block. * * <p>The input <code>plain</code>, starting at <code>plainOffset</code> * and ending at <code>(plainOffset+blockSize-1)</code>, is encrypted. * The result is stored in <code>cipher</code>, starting at * <code>cipherOffset</code>. * * @param plain the input buffer with the data to be encrypted * @param plainOffset the offset in <code>plain</code> * @param cipher the buffer for the encryption result * @param cipherOffset the offset in <code>cipher</code> */
abstract void encryptBlock(byte[] plain, int plainOffset, byte[] cipher, int cipherOffset);
Decrypt one cipher block.

The input cipher, starting at cipherOffset and ending at (cipherOffset+blockSize-1), is decrypted. The result is stored in plain, starting at plainOffset.

Params:
  • cipher – the input buffer with the data to be decrypted
  • cipherOffset – the offset in cipher
  • plain – the buffer for the decryption result
  • plainOffset – the offset in plain
/** * Decrypt one cipher block. * * <p>The input <code>cipher</code>, starting at <code>cipherOffset</code> * and ending at <code>(cipherOffset+blockSize-1)</code>, is decrypted. * The result is stored in <code>plain</code>, starting at * <code>plainOffset</code>. * * @param cipher the input buffer with the data to be decrypted * @param cipherOffset the offset in <code>cipher</code> * @param plain the buffer for the decryption result * @param plainOffset the offset in <code>plain</code> */
abstract void decryptBlock(byte[] cipher, int cipherOffset, byte[] plain, int plainOffset); }