Class I2PHMac

  • All Implemented Interfaces:
    Mac

    public class I2PHMac
    extends Object
    implements Mac
    HMAC implementation based on RFC2104 H(K XOR opad, H(K XOR ipad, text)) modified by jrandom to use the session key byte array directly and to cache a frequently used buffer (called on doFinal). changes released into the public domain in 2005. This is renamed from HMac because the constructor HMac(digest, sz) does not exist in the standard bouncycastle library, thus it conflicts in JVMs that contain the standard library (Android). As of 0.9.12, refactored to use standard MessageDigest. Deprecated - Do not use outside of router or Syndie. To be moved to router.
    • Constructor Detail

      • I2PHMac

        @Deprecated
        public I2PHMac​(MessageDigest digest)
        Deprecated.
        Use javax.crypto.Mac
        Standard HMAC, size == digest size.
      • I2PHMac

        public I2PHMac​(MessageDigest digest,
                       int sz)
        Parameters:
        sz - override the digest's size, nonstandard if different. SEE NOTES in HMACGenerator about why this isn't compatible with standard HmacMD5
    • Method Detail

      • 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 MessageDigest getUnderlyingDigest()
      • init

        public void init​(byte[] key)
        Description copied from interface: Mac
        Initialise the MAC.
        Specified by:
        init in interface Mac
        Parameters:
        key - the key required by the 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