org.spongycastle.crypto

Interface AsymmetricBlockCipher

All Known Implementing Classes:

ElGamalEngine, ISO9796d1Encoding, NaccacheSternEngine, NTRUEngine, OAEPEncoding, PKCS1Encoding, RSABlindedEngine, RSABlindingEngine, RSAEngine

public interface AsymmetricBlockCipher

base interface that a public/private key block cipher needs to conform to.

Method Summary

Modifier and Type	Method and Description
int	getInputBlockSize() returns the largest size an input block can be.
int	getOutputBlockSize() returns the maximum size of the block produced by this cipher.
void	init(boolean forEncryption, CipherParameters param) initialise the cipher.
byte[]	processBlock(byte[] in, int inOff, int len) process the block of len bytes stored in in from offset inOff.

Method Detail

init

void init(boolean forEncryption,
          CipherParameters param)

initialise the cipher.

Parameters:

forEncryption - if true the cipher is initialised for encryption, if false for decryption.

param - the key and other data required by the cipher.

getInputBlockSize

int getInputBlockSize()

returns the largest size an input block can be.

Returns:

maximum size for an input block.

getOutputBlockSize

int getOutputBlockSize()

returns the maximum size of the block produced by this cipher.

Returns:

maximum size of the output block produced by the cipher.

processBlock

byte[] processBlock(byte[] in,
                    int inOff,
                    int len)
             throws InvalidCipherTextException

process the block of len bytes stored in in from offset inOff.

Parameters:

in - the input data

inOff - offset into the in array where the data starts

len - the length of the block to be processed.

Returns:

the resulting byte array of the encryption/decryption process.

Throws:

InvalidCipherTextException - data decrypts improperly.

DataLengthException - the input data is too large for the cipher.