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## org.bouncycastle.crypto.engines
Class ElGamalEngine

    java.lang.Object
      |
      +--org.bouncycastle.crypto.engines.ElGamalEngine

All Implemented Interfaces:
  AsymmetricBlockCipher

public class ElGamalEngine
extends java.lang.Object
implements AsymmetricBlockCipher

this does your basic ElGamal algorithm.

Constructor Summary
`ElGamalEngine()`

Method Summary
`int` | `getInputBlockSize()` Return the maximum size for an input block to this engine.
`int` | `getOutputBlockSize()` Return the maximum size for an output block to this engine.
`void` | `init(boolean forEncryption, CipherParameters param)` initialise the ElGamal engine.
`byte[]` | `processBlock(byte[] in, int inOff, int inLen)` Process a single block using the basic ElGamal algorithm.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ElGamalEngine

    public ElGamalEngine()

Method Detail

### init

    public void init(boolean forEncryption,
                     CipherParameters param)

  initialise the ElGamal engine.

  Specified by:
    `init` in interface `AsymmetricBlockCipher`
  Parameters:
    `forEncryption` - true if we are encrypting, false otherwise.
    `param` - the necessary ElGamal key parameters.

### getInputBlockSize

    public int getInputBlockSize()

  Return the maximum size for an input block to this engine. For ElGamal this is always one byte less than the size of P on encryption, and twice the length as the size of P on decryption.

  Specified by:
    `getInputBlockSize` in interface `AsymmetricBlockCipher`
  Returns:
    maximum size for an input block.

### getOutputBlockSize

    public int getOutputBlockSize()

  Return the maximum size for an output block to this engine. For ElGamal this is always one byte less than the size of P on decryption, and twice the length as the size of P on encryption.

  Specified by:
    `getOutputBlockSize` in interface `AsymmetricBlockCipher`
  Returns:
    maximum size for an output block.

### processBlock

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

  Process a single block using the basic ElGamal algorithm.

  Specified by:
    `processBlock` in interface `AsymmetricBlockCipher`
  Parameters:
    `in` - the input array.
    `inOff` - the offset into the input buffer where the data starts.
    `inLen` - the length of the data to be processed.
  Returns:
    the result of the ElGamal process.
  Throws:
    `DataLengthException` - the input block is too large.

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