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## org.bouncycastle.crypto
Interface AsymmetricBlockCipher

All 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 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.

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