+++ /dev/null
-/* MessageDigest.java --- The message digest interface.
- Copyright (C) 1999 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package java.security;
-
-public abstract class MessageDigest extends MessageDigestSpi
-{
- private String algorithm;
- private Provider provider;
- private byte[] lastDigest;
-
- /**
- Creates a MessageDigest representing the specified
- algorithm.
-
- @param algorithm the name of digest algorithm to choose
- */
- protected MessageDigest(String algorithm)
- {
- this.algorithm = algorithm;
- provider = null;
- }
-
- /**
- Gets an instance of the MessageDigest class representing
- the specified digest. If the algorithm is not found then,
- it throws NoSuchAlgorithmException.
-
- @param algorithm the name of digest algorithm to choose
- @return a MessageDigest representing the desired algorithm
-
- @exception NoSuchAlgorithmException if the algorithm is not implemented by providers
- */
- public static MessageDigest getInstance(String algorithm)
- throws NoSuchAlgorithmException
- {
- Provider[] p = Security.getProviders();
- String name = "MessageDigest." + algorithm;
-
- for (int i = 0; i < p.length; i++)
- {
- String classname = p[i].getProperty(name);
- if (classname != null)
- return getInstance(classname, algorithm, p[i]);
- }
-
- throw new NoSuchAlgorithmException(algorithm);
- }
-
- /**
- Gets an instance of the MessageDigest class representing
- the specified digest from the specified provider. If the
- algorithm is not found then, it throws NoSuchAlgorithmException.
- If the provider is not found, then it throws
- NoSuchProviderException.
-
- @param algorithm the name of digest algorithm to choose
- @param provider the name of the provider to find the algorithm in
- @return a MessageDigest representing the desired algorithm
-
- @exception NoSuchAlgorithmException if the algorithm is not implemented by the provider
- @exception NoSuchProviderException if the provider is not found
- */
-
- public static MessageDigest getInstance(String algorithm, String provider)
- throws NoSuchAlgorithmException, NoSuchProviderException
- {
- Provider p = Security.getProvider(provider);
-
- if (p == null)
- throw new NoSuchProviderException(provider);
-
- return getInstance(p.getProperty("MessageDigest." + algorithm),
- algorithm, p);
- }
-
- private static MessageDigest getInstance(String classname,
- String algorithm,
- Provider provider)
- throws NoSuchAlgorithmException
- {
- if (classname == null)
- throw new NoSuchAlgorithmException(algorithm);
-
- try
- {
- MessageDigest m =
- (MessageDigest) Class.forName(classname).newInstance();
- m.algorithm = algorithm;
- m.provider = provider;
- return m;
- }
- catch (ClassNotFoundException cnfe)
- {
- throw new NoSuchAlgorithmException(algorithm + ": Class not found.");
- }
- catch (InstantiationException ie)
- {
- throw new NoSuchAlgorithmException(algorithm
- + ": Class instantiation failed.");
- }
- catch (IllegalAccessException iae)
- {
- throw new NoSuchAlgorithmException(algorithm + ": Illegal Access");
- }
- }
-
-
- /**
- Gets the provider that the MessageDigest is from.
-
- @return the provider the this MessageDigest
- */
- public final Provider getProvider()
- {
- return provider;
- }
-
- /**
- Updates the digest with the byte.
-
- @param input byte to update the digest with
- */
- public void update(byte input)
- {
- engineUpdate(input);
- }
-
- /**
- Updates the digest with the bytes from the array from the
- specified offset to the specified length.
-
- @param input bytes to update the digest with
- @param offset the offset to start at
- @param len length of the data to update with
- */
- public void update(byte[]input, int offset, int len)
- {
- engineUpdate(input, 0, input.length);
- }
-
- /**
- Updates the digest with the bytes from the array.
-
- @param input bytes to update the digest with
- */
- public void update(byte[]input)
- {
- engineUpdate(input, 0, input.length);
- }
-
- /**
- Computes the digest of the stored data.
-
- @return a byte array representing the message digest
- */
- public byte[] digest()
- {
- return lastDigest = engineDigest();
- }
-
- /**
- Computes the final digest of the stored bytes and returns
- them.
-
- @param buf An array of bytes to store the digest
- @param offset An offset to start storing the digest at
- @param len The length of the buffer
- @return Returns the length of the buffer
- */
- public int digest(byte[]buf, int offset, int len) throws DigestException
- {
- return engineDigest(buf, offset, len);
- }
-
- /**
- Computes a final update using the input array of bytes,
- then computes a final digest and returns it. It calls
- update(input) and then digest();
-
- @param buf An array of bytes to perform final update with
- @return a byte array representing the message digest
- */
- public byte[] digest(byte[]input)
- {
- update(input);
- return digest();
- }
-
- /**
- Returns a representation of the MessageDigest as a String.
-
- @return a string representing the message digest
- */
- public String toString()
- {
- return (getClass()).getName()
- + " Message Digest <" + digestToString() + ">";
- }
-
- /**
- Does a simple byte comparison of the two digests.
-
- @param digesta first digest to compare
- @param digestb second digest to compare
- @return true if they are equal, false otherwise
- */
- public static boolean isEqual(byte[]digesta, byte[]digestb)
- {
- if (digesta.length != digestb.length)
- return false;
-
- for (int i = digesta.length - 1; i >= 0; --i)
- if (digesta[i] != digestb[i])
- return false;
-
- return true;
- }
-
-
- /**
- Resets the message digest.
- */
- public void reset()
- {
- engineReset();
- }
-
- /**
- Gets the name of the algorithm currently used.
- The names of algorithms are usually SHA-1 or MD5.
-
- @return name of algorithm.
- */
- public final String getAlgorithm()
- {
- return algorithm;
- }
-
- /**
- Gets the length of the message digest.
- The default is zero which means that this message digest
- does not implement this function.
-
- @return length of the message digest
- */
- public final int getDigestLength()
- {
- return engineGetDigestLength();
- }
-
- /**
- Returns a clone of this class if supported.
- If it does not then it throws CloneNotSupportedException.
- The cloning of this class depends on whether the subclass
- MessageDigestSpi implements Cloneable which contains the
- actual implementation of the appropriate algorithm.
-
- @return clone of this class
-
- @exception CloneNotSupportedException this class does not support cloning
- */
- public Object clone() throws CloneNotSupportedException
- {
- if (this instanceof Cloneable)
- return super.clone();
- else
- throw new CloneNotSupportedException();
- }
-
- private String digestToString()
- {
- byte[] digest = lastDigest;
-
- if (digest == null)
- return "incomplete";
-
- StringBuffer buf = new StringBuffer();
- int len = digest.length;
- for (int i = 0; i < len; ++i)
- {
- byte b = digest[i];
- byte high = (byte) ((b & 0xff) >>> 4);
- byte low = (byte) (b & 0xf);
-
- buf.append(high > 9 ? ('a' - 10) + high : '0' + high);
- buf.append(low > 9 ? ('a' - 10) + low : '0' + low);
- }
-
- return buf.toString();
- }
-
-}
projects / msp430-gcc.git / blobdiff