Package org.bouncycastle.crypto.digests

## Class MD2Digest

- java.lang.Object
- - org.bouncycastle.crypto.digests.MD2Digest

- All Implemented Interfaces:
    `Digest`, `ExtendedDigest`, `Memoable`

      public class MD2Digest
      extends java.lang.Object
      implements ExtendedDigest, Memoable

  implementation of MD2 as outlined in RFC1319 by B.Kaliski from RSA Laboratories April 1992

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `MD2Digest()` |
    `MD2Digest​(MD2Digest t)` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `Memoable` | `copy()` | Produce a copy of this object with its configuration and in its current state.
    `int` | `doFinal​(byte[] out, int outOff)` | close the digest, producing the final digest value.
    `java.lang.String` | `getAlgorithmName()` | return the algorithm name
    `int` | `getByteLength()` | Return the size in bytes of the internal buffer the digest applies it's compression function to.
    `int` | `getDigestSize()` | return the size, in bytes, of the digest produced by this message digest.
    `protected void` | `processBlock​(byte[] m)` |
    `protected void` | `processCheckSum​(byte[] m)` |
    `void` | `reset()` | reset the digest back to it's initial state.
    `void` | `reset​(Memoable other)` | Restore a copied object state into this object.
    `void` | `update​(byte in)` | update the message digest with a single byte.
    `void` | `update​(byte[] in, int inOff, int len)` | update the message digest with a block of bytes.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### MD2Digest

          public MD2Digest()

    - #### MD2Digest

          public MD2Digest​(MD2Digest t)

  - ### Method Detail

    - #### getAlgorithmName

          public java.lang.String getAlgorithmName()

      return the algorithm name
      Specified by:
        `getAlgorithmName` in interface `Digest`
      Returns:
        the algorithm name

    - #### getDigestSize

          public int getDigestSize()

      return the size, in bytes, of the digest produced by this message digest.
      Specified by:
        `getDigestSize` in interface `Digest`
      Returns:
        the size, in bytes, of the digest produced by this message digest.

    - #### doFinal

          public int doFinal​(byte[] out,
                             int outOff)

      close the digest, producing the final digest value. The doFinal call leaves the digest reset.
      Specified by:
        `doFinal` in interface `Digest`
      Parameters:
        `out` - the array the digest is to be copied into.
        `outOff` - the offset into the out array the digest is to start at.

    - #### reset

          public void reset()

      reset the digest back to it's initial state.
      Specified by:
        `reset` in interface `Digest`

    - #### update

          public void update​(byte in)

      update the message digest with a single byte.
      Specified by:
        `update` in interface `Digest`
      Parameters:
        `in` - the input byte to be entered.

    - #### update

          public void update​(byte[] in,
                             int inOff,
                             int len)

      update the message digest with a block of bytes.
      Specified by:
        `update` in interface `Digest`
      Parameters:
        `in` - the byte array containing the data.
        `inOff` - the offset into the byte array where the data starts.
        `len` - the length of the data.

    - #### processCheckSum

          protected void processCheckSum​(byte[] m)

    - #### processBlock

          protected void processBlock​(byte[] m)

    - #### getByteLength

          public int getByteLength()

      Description copied from interface: `ExtendedDigest`
      Return the size in bytes of the internal buffer the digest applies it's compression function to.
      Specified by:
        `getByteLength` in interface `ExtendedDigest`
      Returns:
        byte length of the digests internal buffer.

    - #### copy

          public Memoable copy()

      Description copied from interface: `Memoable`
      Produce a copy of this object with its configuration and in its current state.

      The returned object may be used simply to store the state, or may be used as a similar object starting from the copied state.

      Specified by:
        `copy` in interface `Memoable`

    - #### reset

          public void reset​(Memoable other)

      Description copied from interface: `Memoable`
      Restore a copied object state into this object.

      Implementations of this method should try to avoid or minimise memory allocation to perform the reset.

      Specified by:
        `reset` in interface `Memoable`
      Parameters:
        `other` - an object originally `copied` from an object of the same type as this instance.