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    1   package org.bouncycastle.crypto;
    2   
    3   /**
    4    * Generic signer interface for hash based and message recovery signers.
    5    */
    6   public interface Signer 
    7   {
    8       /**
    9        * Initialise the signer for signing or verification.
   10        * 
   11        * @param forSigning true if for signing, false otherwise
   12        * @param param necessary parameters.
   13        */
   14       public void init(boolean forSigning, CipherParameters param);
   15   
   16       /**
   17        * update the internal digest with the byte b
   18        */
   19       public void update(byte b);
   20   
   21       /**
   22        * update the internal digest with the byte array in
   23        */
   24       public void update(byte[] in, int off, int len);
   25   
   26       /**
   27        * generate a signature for the message we've been loaded with using
   28        * the key we were initialised with.
   29        */
   30       public byte[] generateSignature()
   31           throws CryptoException, DataLengthException;
   32   
   33       /**
   34        * return true if the internal state represents the signature described
   35        * in the passed in array.
   36        */
   37       public boolean verifySignature(byte[] signature);
   38       
   39       /**
   40        * reset the internal state
   41        */
   42       public void reset();
   43   }

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