Package org.bouncycastle.crypto.macs

## Class OldHMac

- java.lang.Object
- - org.bouncycastle.crypto.macs.OldHMac

- All Implemented Interfaces:
    `Mac`

      public class OldHMac
      extends java.lang.Object
      implements Mac

  HMAC implementation based on RFC2104 H(K XOR opad, H(K XOR ipad, text))

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `OldHMac​(Digest digest)` | Deprecated. uses incorrect pad for SHA-512 and SHA-384 use HMac.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `int` | `doFinal​(byte[] out, int outOff)` | Compute the final stage of the MAC writing the output to the out parameter.
    `java.lang.String` | `getAlgorithmName()` | Return the name of the algorithm the MAC implements.
    `int` | `getMacSize()` | Return the block size for this MAC (in bytes).
    `Digest` | `getUnderlyingDigest()` |
    `void` | `init​(CipherParameters params)` | Initialise the MAC.
    `void` | `reset()` | Reset the mac generator.
    `void` | `update​(byte in)` | add a single byte to the mac for processing.
    `void` | `update​(byte[] in, int inOff, int len)` |

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

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

- - ### Constructor Detail

    - #### OldHMac

          public OldHMac​(Digest digest)

      Deprecated.
      uses incorrect pad for SHA-512 and SHA-384 use HMac.

  - ### Method Detail

    - #### getAlgorithmName

          public java.lang.String getAlgorithmName()

      Description copied from interface: `Mac`
      Return the name of the algorithm the MAC implements.
      Specified by:
        `getAlgorithmName` in interface `Mac`
      Returns:
        the name of the algorithm the MAC implements.

    - #### getUnderlyingDigest

          public Digest getUnderlyingDigest()

    - #### init

          public void init​(CipherParameters params)

      Description copied from interface: `Mac`
      Initialise the MAC.
      Specified by:
        `init` in interface `Mac`
      Parameters:
        `params` - the key and other data required by the MAC.

    - #### getMacSize

          public int getMacSize()

      Description copied from interface: `Mac`
      Return the block size for this MAC (in bytes).
      Specified by:
        `getMacSize` in interface `Mac`
      Returns:
        the block size for this MAC in bytes.

    - #### update

          public void update​(byte in)

      Description copied from interface: `Mac`
      add a single byte to the mac for processing.
      Specified by:
        `update` in interface `Mac`
      Parameters:
        `in` - the byte to be processed.

    - #### update

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

      Specified by:
        `update` in interface `Mac`
      Parameters:
        `in` - the array containing the input.
        `inOff` - the index in the array the data begins at.
        `len` - the length of the input starting at inOff.

    - #### doFinal

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

      Description copied from interface: `Mac`
      Compute the final stage of the MAC writing the output to the out parameter.

      doFinal leaves the MAC in the same state it was after the last init.

      Specified by:
        `doFinal` in interface `Mac`
      Parameters:
        `out` - the array the MAC is to be output to.
        `outOff` - the offset into the out buffer the output is to start at.

    - #### reset

          public void reset()

      Reset the mac generator.
      Specified by:
        `reset` in interface `Mac`