Class OAEPEncoding

public OAEPEncoding(AsymmetricBlockCipher cipher)

public OAEPEncoding(AsymmetricBlockCipher cipher,
                    Digest hash)

public OAEPEncoding(AsymmetricBlockCipher cipher,
                    Digest hash,
                    byte[] encodingParams)

public byte[] decodeBlock(byte[] in,
                          int inOff,
                          int inLen)
            throws InvalidCipherTextException

Throws:

InvalidCipherTextException - if the decrypted block turns out to be badly formatted.

public byte[] encodeBlock(byte[] in,
                          int inOff,
                          int inLen)
            throws InvalidCipherTextException

public int getInputBlockSize()

returns the largest size an input block can be.

Specified by:

getInputBlockSize in interface AsymmetricBlockCipher

Returns:

maximum size for an input block.

public int getOutputBlockSize()

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

Specified by:

getOutputBlockSize in interface AsymmetricBlockCipher

Returns:

maximum size of the output block produced by the cipher.

public AsymmetricBlockCipher getUnderlyingCipher()

public void init(boolean forEncryption,
                 CipherParameters param)

initialise the cipher.

Specified by:

init in interface AsymmetricBlockCipher

Parameters:

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

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

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

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

Specified by:

processBlock in interface AsymmetricBlockCipher

Parameters:

in - the input data

inOff - offset into the in array where the data starts

Returns:

the resulting byte array of the encryption/decryption process.

Throws:

InvalidCipherTextException - data decrypts improperly.