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## gnu.crypto.mode
Class ECB

    java.lang.Object
      |
      +--gnu.crypto.mode.BaseMode
            |
            +--gnu.crypto.mode.ECB

All Implemented Interfaces:
  java.lang.Cloneable, IBlockCipher, IMode

public class ECB
extends BaseMode
implements java.lang.Cloneable

The implementation of the Electronic Codebook mode.

The Electronic Codebook (ECB) mode is a confidentiality mode that is defined as follows:

- ECB Encryption: Cj = CIPHK(Pj) for j = 1...n
- ECB Decryption: Pj = CIPH-1K(Cj) for j = 1...n

In ECB encryption, the forward cipher function is applied directly, and independently, to each block of the plaintext. The resulting sequence of output blocks is the ciphertext.

In ECB decryption, the inverse cipher function is applied directly, and independently, to each block of the ciphertext. The resulting sequence of output blocks is the plaintext.

References:

1. Recommendation for Block Cipher Modes of Operation Methods and Techniques, Morris Dworkin.

Version:
  $Revision: 1.4 $

Fields inherited from class gnu.crypto.mode.BaseMode
`cipher, cipherBlockSize, iv, lock, modeBlockSize, name, state`

Fields inherited from interface gnu.crypto.mode.IMode
`DECRYPTION, ENCRYPTION, IV, MODE_BLOCK_SIZE, STATE`

Fields inherited from interface gnu.crypto.cipher.IBlockCipher
`CIPHER_BLOCK_SIZE, KEY_MATERIAL`

Constructor Summary
`(package private)` | `ECB(IBlockCipher underlyingCipher, int cipherBlockSize)` Trivial package-private constructor for use by the Factory class.

Method Summary
`java.lang.Object` | `clone()` Returns a clone of this instance.
`void` | `decryptBlock(byte[] in, int i, byte[] out, int o)` Decrypts exactly one block of ciphertext.
`void` | `encryptBlock(byte[] in, int i, byte[] out, int o)` Encrypts exactly one block of plaintext.
`void` | `setup()` The initialisation phase of the concrete mode implementation.
`void` | `teardown()` The termination phase of the concrete mode implementation.

Methods inherited from class gnu.crypto.mode.BaseMode
`blockSizes, currentBlockSize, defaultBlockSize, defaultKeySize, init, keySizes, name, reset, selfTest, update`

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

Constructor Detail

### ECB

    ECB(IBlockCipher underlyingCipher,
        int cipherBlockSize)

  Trivial package-private constructor for use by the Factory class.

  Parameters:
    `underlyingCipher` - the underlying cipher implementation.
    `cipherBlockSize` - the underlying cipher block size to use.

Method Detail

### clone

    public java.lang.Object clone()

  Description copied from interface: `IBlockCipher`

  Returns a clone of this instance.

  Overrides:
    `clone` in class `BaseMode`
  Following copied from interface: `gnu.crypto.cipher.IBlockCipher`
  Returns:
    a clone copy of this instance.

### setup

    public void setup()

  Description copied from class: `BaseMode`
  The initialisation phase of the concrete mode implementation.
  Overrides:
    `setup` in class `BaseMode`

### teardown

    public void teardown()

  Description copied from class: `BaseMode`
  The termination phase of the concrete mode implementation.
  Overrides:
    `teardown` in class `BaseMode`

### encryptBlock

    public void encryptBlock(byte[] in,
                             int i,
                             byte[] out,
                             int o)

  Description copied from interface: `IBlockCipher`

  Encrypts exactly one block of plaintext.

  Overrides:
    `encryptBlock` in class `BaseMode`
  Following copied from interface: `gnu.crypto.cipher.IBlockCipher`
  Parameters:
    `in` - the plaintext.
    `inOffset` - index of `in` from which to start considering data.
    `out` - the ciphertext.
    `outOffset` - index of `out` from which to store result.
  Throws:
    `java.lang.IllegalStateException` - if the instance is not initialised.

### decryptBlock

    public void decryptBlock(byte[] in,
                             int i,
                             byte[] out,
                             int o)

  Description copied from interface: `IBlockCipher`

  Decrypts exactly one block of ciphertext.

  Overrides:
    `decryptBlock` in class `BaseMode`
  Following copied from interface: `gnu.crypto.cipher.IBlockCipher`
  Parameters:
    `in` - the plaintext.
    `inOffset` - index of `in` from which to start considering data.
    `out` - the ciphertext.
    `outOffset` - index of `out` from which to store result.
  Throws:
    `java.lang.IllegalStateException` - if the instance is not initialised.

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