content: /*******************************************************************************
   * Software Name : RCS IMS Stack
   *
   * Copyright (C) 2010-2016 Orange.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   ******************************************************************************/
  
  package com.gsma.rcs.core.ims.security;
  
  /**
   * Interface that a message digest conforms to
   */
  public interface Digest {
      /**
       * return the algorithm name
       * 
       * @return the algorithm name
       */
      public String getAlgorithmName();
  
      /**
       * return the size, in bytes, of the digest produced by this message digest
       * 
       * @return the size, in bytes, of the digest produced by this message digest
       */
      public int getDigestSize();
  
      /**
       * Update the message digest with a single byte.
       * 
       * @param in Input byte to be entered.
       */
      public void update(byte in);
  
      /**
       * Update the message digest with a block of bytes.
       * 
       * @param in Byte array containing the data
       * @param inOff Offset into the byte array where the data starts
       * @param len Length of the data
       */
      public void update(byte[] in, int inOff, int len);
  
      /**
       * Close the digest, producing the final digest value. The doFinal call leaves the digest reset.
       * 
       * @param out Array the digest is to be copied into
       * @param outOff Offset into the out array the digest is to start at
       */
      public int doFinal(byte[] out, int outOff);
  
      /**
       * reset the digest back to it's initial state.
       */
      public void reset();
  }
  