java.lang.Object
com.ongres.scram.common.bouncycastle.pbkdf2.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

    • IPAD

      private static final byte IPAD
      See Also:
    • OPAD

      private static final byte OPAD
      See Also:
    • digest

      private Digest digest
    • digestSize

      private int digestSize
    • blockLength

      private int blockLength
    • ipadState

      private Memoable ipadState
    • opadState

      private Memoable opadState
    • inputPad

      private byte[] inputPad
    • outputBuf

      private byte[] outputBuf
    • blockLengths

      private static Hashtable<String,Integer> blockLengths
  • Constructor Details

    • HMac

      public HMac(Digest digest)
      Base constructor for one of the standard digest algorithms that the byteLength of the algorithm is know for.
      Parameters:
      digest - the digest.
    • HMac

      private HMac(Digest digest, int byteLength)
  • Method Details

    • getByteLength

      private static int getByteLength(Digest digest)
    • 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
      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
    • xorPad

      private static void xorPad(byte[] pad, int len, byte n)