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Bouncy Castle Cryptography 1.11 API Specification: Interface AsymmetricBlockCipher

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Bouncy Castle Cryptography 1.11

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org.bouncycastle.crypto
Interface AsymmetricBlockCipher

All Known Implementing Classes:: OAEPEncoding, ISO9796d1Encoding, PKCS1Encoding, ElGamalEngine, 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 Detail

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.

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.

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