com.googlecode.gwt.crypto.bouncycastle.AsymmetricBlockCipher Maven / Gradle / Ivy
package com.googlecode.gwt.crypto.bouncycastle;
/**
* 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;
}