package org.bouncycastle.crypto;/** * base interface that a public/private key block cipher needs * to conform to. */public interface AsymmetricBlockCipher{    /**     * initialise the cipher.     *     * @param forEncryption if true the cipher is initialised for      *  encryption, if false for decryption.     * @param param the key and other data required by the cipher.     */    public void init(boolean forEncryption, CipherParameters param);    /**     * returns the largest size an input block can be.     *     * @return maximum size for an input block.     */    public int getInputBlockSize();    /**     * returns the maximum size of the block produced by this cipher.     *     * @return maximum size of the output block produced by the cipher.     */    public int getOutputBlockSize();    /**     * process the block of len bytes stored in in from offset inOff.     *     * @param in the input data     * @param inOff offset into the in array where the data starts     * @param len the length of the block to be processed.     * @return the resulting byte array of the encryption/decryption process.     * @exception InvalidCipherTextException data decrypts improperly.     * @exception DataLengthException the input data is too large for the cipher.     */    public byte[] processBlock(byte[] in, int inOff, int len)        throws InvalidCipherTextException;}