Class HMac

java.lang.Object
org.gudy.bouncycastle.crypto.macs.HMac
All Implemented Interfaces:
Mac

public class HMac extends Object implements Mac
HMAC implementation based on RFC2104 H(K XOR opad, H(K XOR ipad, text))
  • Field Details

    • BLOCK_LENGTH

      private static final int BLOCK_LENGTH
      See Also:
    • IPAD

      private static final byte IPAD
      See Also:
    • OPAD

      private static final byte OPAD
      See Also:
    • digest

      private Digest digest
    • digestSize

      private int digestSize
    • inputPad

      private byte[] inputPad
    • outputPad

      private byte[] outputPad
  • Constructor Details

    • HMac

      public HMac(Digest digest)
  • Method Details

    • getAlgorithmName

      public 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
    • getMacSize

      public int getMacSize()
      Description copied from interface: Mac
      Return the block size for this cipher (in bytes).
      Specified by:
      getMacSize in interface Mac
      Returns:
      the block size for this cipher 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 statge 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