src/share/classes/com/sun/crypto/provider/HmacCore.java - platform/external/jetbrains/jdk8u_jdk - Git at Google

 /*
  * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 package com.sun.crypto.provider;

 import java.util.Arrays;

 import java.nio.ByteBuffer;

 import javax.crypto.MacSpi;
 import javax.crypto.SecretKey;
 import java.security.*;
 import java.security.spec.*;

 /**
  * This class constitutes the core of HMAC-<MD> algorithms, where
  * <MD> can be SHA1 or MD5, etc. See RFC 2104 for spec.
  *
  * It also contains the implementation classes for SHA-224, SHA-256,
  * SHA-384, and SHA-512 HMACs.
  *
  * @author Jan Luehe
  */
 abstract class HmacCore extends MacSpi implements Cloneable {

     private MessageDigest md;
     private byte[] k_ipad; // inner padding - key XORd with ipad
     private byte[] k_opad; // outer padding - key XORd with opad
     private boolean first;       // Is this the first data to be processed?

     private final int blockLen;

     /**
      * Standard constructor, creates a new HmacCore instance using the
      * specified MessageDigest object.
      */
     HmacCore(MessageDigest md, int bl) {
         this.md = md;
         this.blockLen = bl;
         this.k_ipad = new byte[blockLen];
         this.k_opad = new byte[blockLen];
         first = true;
     }

     /**
      * Standard constructor, creates a new HmacCore instance instantiating
      * a MessageDigest of the specified name.
      */
     HmacCore(String digestAlgorithm, int bl) throws NoSuchAlgorithmException {
         this(MessageDigest.getInstance(digestAlgorithm), bl);
     }

     /**
      * Returns the length of the HMAC in bytes.
      *
      * @return the HMAC length in bytes.
      */
     protected int engineGetMacLength() {
         return this.md.getDigestLength();
     }

     /**
      * Initializes the HMAC with the given secret key and algorithm parameters.
      *
      * @param key the secret key.
      * @param params the algorithm parameters.
      *
      * @exception InvalidKeyException if the given key is inappropriate for
      * initializing this MAC.
      * @exception InvalidAlgorithmParameterException if the given algorithm
      * parameters are inappropriate for this MAC.
      */
     protected void engineInit(Key key, AlgorithmParameterSpec params)
             throws InvalidKeyException, InvalidAlgorithmParameterException {
         if (params != null) {
             throw new InvalidAlgorithmParameterException
                 ("HMAC does not use parameters");
         }

         if (!(key instanceof SecretKey)) {
             throw new InvalidKeyException("Secret key expected");
         }

         byte[] secret = key.getEncoded();
         if (secret == null) {
             throw new InvalidKeyException("Missing key data");
         }

         // if key is longer than the block length, reset it using
         // the message digest object.
         if (secret.length > blockLen) {
             byte[] tmp = md.digest(secret);
             // now erase the secret
             Arrays.fill(secret, (byte)0);
             secret = tmp;
         }

         // XOR k with ipad and opad, respectively
         for (int i = 0; i < blockLen; i++) {
             int si = (i < secret.length) ? secret[i] : 0;
             k_ipad[i] = (byte)(si ^ 0x36);
             k_opad[i] = (byte)(si ^ 0x5c);
         }

         // now erase the secret
         Arrays.fill(secret, (byte)0);
         secret = null;

         engineReset();
     }

     /**
      * Processes the given byte.
      *
      * @param input the input byte to be processed.
      */
     protected void engineUpdate(byte input) {
         if (first == true) {
             // compute digest for 1st pass; start with inner pad
             md.update(k_ipad);
             first = false;
         }

         // add the passed byte to the inner digest
         md.update(input);
     }

     /**
      * Processes the first <code>len</code> bytes in <code>input</code>,
      * starting at <code>offset</code>.
      *
      * @param input the input buffer.
      * @param offset the offset in <code>input</code> where the input starts.
      * @param len the number of bytes to process.
      */
     protected void engineUpdate(byte input[], int offset, int len) {
         if (first == true) {
             // compute digest for 1st pass; start with inner pad
             md.update(k_ipad);
             first = false;
         }

         // add the selected part of an array of bytes to the inner digest
         md.update(input, offset, len);
     }

     /**
      * Processes the <code>input.remaining()</code> bytes in the ByteBuffer
      * <code>input</code>.
      *
      * @param input the input byte buffer.
      */
     protected void engineUpdate(ByteBuffer input) {
         if (first == true) {
             // compute digest for 1st pass; start with inner pad
             md.update(k_ipad);
             first = false;
         }

         md.update(input);
     }

     /**
      * Completes the HMAC computation and resets the HMAC for further use,
      * maintaining the secret key that the HMAC was initialized with.
      *
      * @return the HMAC result.
      */
     protected byte[] engineDoFinal() {
         if (first == true) {
             // compute digest for 1st pass; start with inner pad
             md.update(k_ipad);
         } else {
             first = true;
         }

         try {
             // finish the inner digest
             byte[] tmp = md.digest();

             // compute digest for 2nd pass; start with outer pad
             md.update(k_opad);
             // add result of 1st hash
             md.update(tmp);

             md.digest(tmp, 0, tmp.length);
             return tmp;
         } catch (DigestException e) {
             // should never occur
             throw new ProviderException(e);
         }
     }

     /**
      * Resets the HMAC for further use, maintaining the secret key that the
      * HMAC was initialized with.
      */
     protected void engineReset() {
         if (first == false) {
             md.reset();
             first = true;
         }
     }

     /*
      * Clones this object.
      */
     public Object clone() throws CloneNotSupportedException {
         HmacCore copy = (HmacCore) super.clone();
         copy.md = (MessageDigest) md.clone();
         copy.k_ipad = k_ipad.clone();
         copy.k_opad = k_opad.clone();
         return copy;
     }

     // nested static class for the HmacSHA224 implementation
     public static final class HmacSHA224 extends HmacCore {
         public HmacSHA224() throws NoSuchAlgorithmException {
             super("SHA-224", 64);
         }
     }

     // nested static class for the HmacSHA256 implementation
     public static final class HmacSHA256 extends HmacCore {
         public HmacSHA256() throws NoSuchAlgorithmException {
             super("SHA-256", 64);
         }
     }

     // nested static class for the HmacSHA384 implementation
     public static final class HmacSHA384 extends HmacCore {
         public HmacSHA384() throws NoSuchAlgorithmException {
             super("SHA-384", 128);
         }
     }

     // nested static class for the HmacSHA512 implementation
     public static final class HmacSHA512 extends HmacCore {
         public HmacSHA512() throws NoSuchAlgorithmException {
             super("SHA-512", 128);
         }
     }
 }
	/*
	* Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package com.sun.crypto.provider;

	import java.util.Arrays;

	import java.nio.ByteBuffer;

	import javax.crypto.MacSpi;
	import javax.crypto.SecretKey;
	import java.security.*;
	import java.security.spec.*;

	/**
	* This class constitutes the core of HMAC-<MD> algorithms, where
	* <MD> can be SHA1 or MD5, etc. See RFC 2104 for spec.
	*
	* It also contains the implementation classes for SHA-224, SHA-256,
	* SHA-384, and SHA-512 HMACs.
	*
	* @author Jan Luehe
	*/
	abstract class HmacCore extends MacSpi implements Cloneable {

	private MessageDigest md;
	private byte[] k_ipad; // inner padding - key XORd with ipad
	private byte[] k_opad; // outer padding - key XORd with opad
	private boolean first; // Is this the first data to be processed?

	private final int blockLen;

	/**
	* Standard constructor, creates a new HmacCore instance using the
	* specified MessageDigest object.
	*/
	HmacCore(MessageDigest md, int bl) {
	this.md = md;
	this.blockLen = bl;
	this.k_ipad = new byte[blockLen];
	this.k_opad = new byte[blockLen];
	first = true;
	}

	/**
	* Standard constructor, creates a new HmacCore instance instantiating
	* a MessageDigest of the specified name.
	*/
	HmacCore(String digestAlgorithm, int bl) throws NoSuchAlgorithmException {
	this(MessageDigest.getInstance(digestAlgorithm), bl);
	}

	/**
	* Returns the length of the HMAC in bytes.
	*
	* @return the HMAC length in bytes.
	*/
	protected int engineGetMacLength() {
	return this.md.getDigestLength();
	}

	/**
	* Initializes the HMAC with the given secret key and algorithm parameters.
	*
	* @param key the secret key.
	* @param params the algorithm parameters.
	*
	* @exception InvalidKeyException if the given key is inappropriate for
	* initializing this MAC.
	* @exception InvalidAlgorithmParameterException if the given algorithm
	* parameters are inappropriate for this MAC.
	*/
	protected void engineInit(Key key, AlgorithmParameterSpec params)
	throws InvalidKeyException, InvalidAlgorithmParameterException {
	if (params != null) {
	throw new InvalidAlgorithmParameterException
	("HMAC does not use parameters");
	}

	if (!(key instanceof SecretKey)) {
	throw new InvalidKeyException("Secret key expected");
	}

	byte[] secret = key.getEncoded();
	if (secret == null) {
	throw new InvalidKeyException("Missing key data");
	}

	// if key is longer than the block length, reset it using
	// the message digest object.
	if (secret.length > blockLen) {
	byte[] tmp = md.digest(secret);
	// now erase the secret
	Arrays.fill(secret, (byte)0);
	secret = tmp;
	}

	// XOR k with ipad and opad, respectively
	for (int i = 0; i < blockLen; i++) {
	int si = (i < secret.length) ? secret[i] : 0;
	k_ipad[i] = (byte)(si ^ 0x36);
	k_opad[i] = (byte)(si ^ 0x5c);
	}

	// now erase the secret
	Arrays.fill(secret, (byte)0);
	secret = null;

	engineReset();
	}

	/**
	* Processes the given byte.
	*
	* @param input the input byte to be processed.
	*/
	protected void engineUpdate(byte input) {
	if (first == true) {
	// compute digest for 1st pass; start with inner pad
	md.update(k_ipad);
	first = false;
	}

	// add the passed byte to the inner digest
	md.update(input);
	}

	/**
	* Processes the first <code>len</code> bytes in <code>input</code>,
	* starting at <code>offset</code>.
	*
	* @param input the input buffer.
	* @param offset the offset in <code>input</code> where the input starts.
	* @param len the number of bytes to process.
	*/
	protected void engineUpdate(byte input[], int offset, int len) {
	if (first == true) {
	// compute digest for 1st pass; start with inner pad
	md.update(k_ipad);
	first = false;
	}

	// add the selected part of an array of bytes to the inner digest
	md.update(input, offset, len);
	}

	/**
	* Processes the <code>input.remaining()</code> bytes in the ByteBuffer
	* <code>input</code>.
	*
	* @param input the input byte buffer.
	*/
	protected void engineUpdate(ByteBuffer input) {
	if (first == true) {
	// compute digest for 1st pass; start with inner pad
	md.update(k_ipad);
	first = false;
	}

	md.update(input);
	}

	/**
	* Completes the HMAC computation and resets the HMAC for further use,
	* maintaining the secret key that the HMAC was initialized with.
	*
	* @return the HMAC result.
	*/
	protected byte[] engineDoFinal() {
	if (first == true) {
	// compute digest for 1st pass; start with inner pad
	md.update(k_ipad);
	} else {
	first = true;
	}

	try {
	// finish the inner digest
	byte[] tmp = md.digest();

	// compute digest for 2nd pass; start with outer pad
	md.update(k_opad);
	// add result of 1st hash
	md.update(tmp);

	md.digest(tmp, 0, tmp.length);
	return tmp;
	} catch (DigestException e) {
	// should never occur
	throw new ProviderException(e);
	}
	}

	/**
	* Resets the HMAC for further use, maintaining the secret key that the
	* HMAC was initialized with.
	*/
	protected void engineReset() {
	if (first == false) {
	md.reset();
	first = true;
	}
	}

	/*
	* Clones this object.
	*/
	public Object clone() throws CloneNotSupportedException {
	HmacCore copy = (HmacCore) super.clone();
	copy.md = (MessageDigest) md.clone();
	copy.k_ipad = k_ipad.clone();
	copy.k_opad = k_opad.clone();
	return copy;
	}

	// nested static class for the HmacSHA224 implementation
	public static final class HmacSHA224 extends HmacCore {
	public HmacSHA224() throws NoSuchAlgorithmException {
	super("SHA-224", 64);
	}
	}

	// nested static class for the HmacSHA256 implementation
	public static final class HmacSHA256 extends HmacCore {
	public HmacSHA256() throws NoSuchAlgorithmException {
	super("SHA-256", 64);
	}
	}

	// nested static class for the HmacSHA384 implementation
	public static final class HmacSHA384 extends HmacCore {
	public HmacSHA384() throws NoSuchAlgorithmException {
	super("SHA-384", 128);
	}
	}

	// nested static class for the HmacSHA512 implementation
	public static final class HmacSHA512 extends HmacCore {
	public HmacSHA512() throws NoSuchAlgorithmException {
	super("SHA-512", 128);
	}
	}
	}