Class StreamBlockCipher

java.lang.Object
org.gudy.bouncycastle.crypto.StreamBlockCipher
All Implemented Interfaces:
StreamCipher
public class StreamBlockCipher extends Object implements StreamCipher
a wrapper for block ciphers with a single byte block size, so that they can be treated like stream ciphers.

  • Field Details

    • cipher

      private BlockCipher cipher

    • oneByte

      private byte[] oneByte

  • Constructor Details

    • StreamBlockCipher

      public StreamBlockCipher(BlockCipher cipher)
      basic constructor.
      Parameters:
      cipher - the block cipher to be wrapped.
      Throws:
      IllegalArgumentException - if the cipher has a block size other than one.

  • Method Details

    • init

      public void init(boolean forEncryption, CipherParameters params)
      initialise the underlying cipher.
      Specified by:
      init in interface StreamCipher
      Parameters:
      forEncryption - true if we are setting up for encryption, false otherwise.
      param - the necessary parameters for the underlying cipher to be initialised.

    • getAlgorithmName

      public String getAlgorithmName()
      return the name of the algorithm we are wrapping.
      Specified by:
      getAlgorithmName in interface StreamCipher
      Returns:
      the name of the algorithm we are wrapping.

    • returnByte

      public byte returnByte(byte in)
      encrypt/decrypt a single byte returning the result.
      Specified by:
      returnByte in interface StreamCipher
      Parameters:
      in - the byte to be processed.
      Returns:
      the result of processing the input byte.

    • processBytes

      public void processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException
      process a block of bytes from in putting the result into out.
      Specified by:
      processBytes in interface StreamCipher
      Parameters:
      in - the input byte array.
      inOff - the offset into the in array where the data to be processed starts.
      len - the number of bytes to be processed.
      out - the output buffer the processed bytes go into.
      outOff - the offset into the output byte array the processed data stars at.
      Throws:
      DataLengthException - if the output buffer is too small.

    • reset

      public void reset()
      reset the underlying cipher. This leaves it in the same state it was at after the last init (if there was one).
      Specified by:
      reset in interface StreamCipher