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Bouncy Castle Cryptography Library 1.39
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org.bouncycastle.crypto

Interface AsymmetricBlockCipher

Known Implementing Classes:
ElGamalEngine, ISO9796d1Encoding, NaccacheSternEngine, OAEPEncoding, PKCS1Encoding, RSABlindedEngine, RSABlindingEngine, RSAEngine
public interface AsymmetricBlockCipher
base interface that a public/private key block cipher needs to conform to.

Method Summary

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 Details

getInputBlockSize

public int getInputBlockSize()
returns the largest size an input block can be.
Returns:
maximum size for an input block.

getOutputBlockSize

public int getOutputBlockSize()
returns the maximum size of the block produced by this cipher.
Returns:
maximum size of the output block produced by the cipher.

init

public 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.

processBlock

public 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.

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