Package com.trilead.ssh2.crypto.cipher

Class AES

  • All Implemented Interfaces:
    BlockCipher
    public class AES
extends java.lang.Object
implements BlockCipher
    An implementation of the AES (Rijndael), from FIPS-197.

    For further details see: http://csrc.nist.gov/encryption/aes/ . This implementation is based on optimizations from Dr. Brian Gladman's paper and C code at http://fp.gladman.plus.com/cryptography_technology/rijndael/ There are three levels of tradeoff of speed vs memory Because java has no preprocessor, they are written as three separate classes from which to choose The fastest uses 8Kbytes of static tables to precompute round calculations, 4 256 word tables for encryption and 4 for decryption. The middle performance version uses only one 256 word table for each, for a total of 2Kbytes, adding 12 rotate operations per round to compute the values contained in the other tables from the contents of the first The slowest version uses no static tables at all and computes the values in each round

    This file contains the fast version with 8Kbytes of static tables for round precomputation

    • Constructor Summary

      Constructors 
      Constructor Description
      AES()
      default constructor - 128 bit block size.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.String getAlgorithmName()  
      int getBlockSize()  
      void init​(boolean forEncryption, byte[] key)
      initialise an AES cipher.
      int processBlock​(byte[] in, int inOff, byte[] out, int outOff)  
      void reset()  
      void transformBlock​(byte[] src, int srcoff, byte[] dst, int dstoff)  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • AES

        public AES()
        default constructor - 128 bit block size.

    • Method Detail

      • init

        public final void init​(boolean forEncryption,
                       byte[] key)
        initialise an AES cipher.
        Specified by:
        init in interface BlockCipher
        Parameters:
        forEncryption - whether or not we are for encryption.
        key - the key required to set up the cipher.
        Throws:
        java.lang.IllegalArgumentException - if the params argument is inappropriate.

      • getAlgorithmName

        public final java.lang.String getAlgorithmName()

      • processBlock

        public final int processBlock​(byte[] in,
                              int inOff,
                              byte[] out,
                              int outOff)

      • reset

        public final void reset()

      • transformBlock

        public void transformBlock​(byte[] src,
                           int srcoff,
                           byte[] dst,
                           int dstoff)
        Specified by:
        transformBlock in interface BlockCipher