+++ /dev/null
-/* SecureRandom.java --- Secure Random class implmentation
- Copyright (C) 1999, 2001 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;
-import java.io.Serializable;
-import java.util.Random;
-import java.util.Enumeration;
-
-/**
- SecureRandom is the class interface for using SecureRandom
- providers. It provides an interface to the SecureRandomSpi
- engine so that programmers can generate pseudo-random numbers.
-
- @author Mark Benvenuto <ivymccough@worldnet.att.net>
- */
-public class SecureRandom extends Random
-{
- //Serialized Field
- long counter = 0; //Serialized
- MessageDigest digest = null;
- Provider provider = null;
- byte[] randomBytes = null; //Always null
- int randomBytesUsed = 0;
- SecureRandomSpi secureRandomSpi = null;
- byte[] state = null;
-
- /**
- Default constructor for SecureRandom. It constructs a
- new SecureRandom by instantating the first SecureRandom
- algorithm in the default security provier.
-
- It is not seeded and should be seeded using setSeed or else
- on the first call to getnextBytes it will force a seed.
-
- It is maintained for backwards compatibility and programs
- should use getInstance.
- */
- public SecureRandom()
- {
- Provider p[] = Security.getProviders();
-
- //Format of Key: SecureRandom.algname
- String key;
-
- String classname = null;
- int i, flag = 0;
- Enumeration e;
- for (i = 0; i < p.length; i++)
- {
- e = p[i].propertyNames();
- while (e.hasMoreElements())
- {
- key = (String) e.nextElement();
- if (key.startsWith("SecureRandom."))
- if ((classname = p[i].getProperty(key)) != null)
- break;
- }
- if (classname != null)
- break;
- }
-
- //if( classname == null)
- // throw new NoSuchAlgorithmException();
-
- try
- {
- this.secureRandomSpi =
- (SecureRandomSpi) Class.forName(classname).newInstance();
-
- //s.algorithm = algorithm;
- this.provider = p[i];
- }
- catch (ClassNotFoundException cnfe)
- {
- //throw new NoSuchAlgorithmException("Class not found");
- }
- catch (InstantiationException ie)
- {
- //throw new NoSuchAlgorithmException("Class instantiation failed");
- }
- catch (IllegalAccessException iae)
- {
- //throw new NoSuchAlgorithmException("Illegal Access");
- }
- }
-
- /**
- A constructor for SecureRandom. It constructs a new
- SecureRandom by instantating the first SecureRandom algorithm
- in the default security provier.
-
- It is seeded with the passed function and is useful if the user
- has access to hardware random device (like a radiation detector).
-
- It is maintained for backwards compatibility and programs
- should use getInstance.
-
- @param seed Seed bytes for class
- */
- public SecureRandom(byte[] seed)
- {
- this();
- setSeed(seed);
- }
-
- /**
- A constructor for SecureRandom. It constructs a new
- SecureRandom using the specified SecureRandomSpi from
- the specified security provier.
-
- @param secureRandomSpi A SecureRandomSpi class
- @param provider A Provider class
- */
- protected SecureRandom(SecureRandomSpi secureRandomSpi, Provider provider)
- {
- this.secureRandomSpi = secureRandomSpi;
- this.provider = provider;
- }
-
- /**
- Returns an instance of a SecureRandom. It creates the class
- for the specified algorithm if it exists from a provider.
-
- @param algorithm A SecureRandom algorithm to use
-
- @return Returns a new SecureRandom implmenting the chosen algorithm
-
- @throws NoSuchAlgorithmException if the algorithm cannot be found
- */
- public static SecureRandom getInstance(String algorithm) throws
- NoSuchAlgorithmException
- {
- Provider p[] = Security.getProviders();
-
- //Format of Key: SecureRandom.algname
- StringBuffer key = new StringBuffer("SecureRandom.");
- key.append(algorithm);
-
- String classname = null;
- int i;
- for (i = 0; i < p.length; i++)
- {
- if ((classname = p[i].getProperty(key.toString())) != null)
- break;
- }
-
- if (classname == null)
- throw new NoSuchAlgorithmException();
-
- try
- {
- return new SecureRandom((SecureRandomSpi) Class.forName(classname).
- newInstance(), p[i]);
- }
- catch (ClassNotFoundException cnfe)
- {
- throw new NoSuchAlgorithmException("Class not found");
- }
- catch (InstantiationException ie)
- {
- throw new NoSuchAlgorithmException("Class instantiation failed");
- }
- catch (IllegalAccessException iae)
- {
- throw new NoSuchAlgorithmException("Illegal Access");
- }
-
- }
-
- /**
- Returns an instance of a SecureRandom. It creates the class
- for the specified algorithm from the specified provider.
-
- @param algorithm A SecureRandom algorithm to use
- @param provider A security provider to use
-
- @return Returns a new SecureRandom implmenting the chosen algorithm
-
- @throws NoSuchAlgorithmException if the algorithm cannot be found
- @throws NoSuchProviderException if the provider cannot be found
- */
- public static SecureRandom getInstance(String algorithm,
- String provider) throws
- NoSuchAlgorithmException, NoSuchProviderException
- {
- Provider p = Security.getProvider(provider);
- if (p == null)
- throw new NoSuchProviderException();
-
- //Format of Key: SecureRandom.algName
- StringBuffer key = new StringBuffer("SecureRandom.");
- key.append(algorithm);
-
- String classname = p.getProperty(key.toString());
- if (classname == null)
- throw new NoSuchAlgorithmException();
-
- try
- {
- return new SecureRandom((SecureRandomSpi) Class.forName(classname).
- newInstance(), p);
- }
- catch (ClassNotFoundException cnfe)
- {
- throw new NoSuchAlgorithmException("Class not found");
- }
- catch (InstantiationException ie)
- {
- throw new NoSuchAlgorithmException("Class instantiation failed");
- }
- catch (IllegalAccessException iae)
- {
- throw new NoSuchAlgorithmException("Illegal Access");
- }
-
- }
-
- /**
- Returns the provider being used by the current SecureRandom class.
-
- @return The provider from which this SecureRandom was attained
- */
- public final Provider getProvider()
- {
- return provider;
- }
-
- /**
- Seeds the SecureRandom. The class is re-seeded for each call and
- each seed builds on the previous seed so as not to weaken security.
-
- @param seed seed bytes to seed with
- */
- public void setSeed(byte[] seed)
- {
- secureRandomSpi.engineSetSeed(seed);
- }
-
- /**
- Seeds the SecureRandom. The class is re-seeded for each call and
- each seed builds on the previous seed so as not to weaken security.
-
- @param seed 8 seed bytes to seed with
- */
- public void setSeed(long seed)
- {
- // This particular setSeed will be called by Random.Random(), via
- // our own constructor, before secureRandomSpi is initialized. In
- // this case we can't call a method on secureRandomSpi, and we
- // definitely don't want to throw a NullPointerException.
- // Therefore we test.
- if (secureRandomSpi != null)
- {
- byte tmp[] = { (byte) (0xff & (seed >> 56)),
- (byte) (0xff & (seed >> 48)),
- (byte) (0xff & (seed >> 40)),
- (byte) (0xff & (seed >> 32)),
- (byte) (0xff & (seed >> 24)),
- (byte) (0xff & (seed >> 16)),
- (byte) (0xff & (seed >> 8)),
- (byte) (0xff & seed)
- };
- secureRandomSpi.engineSetSeed(tmp);
- }
- }
-
- /**
- Generates a user specified number of bytes. This function
- is the basis for all the random functions.
-
- @param bytes array to store generated bytes in
- */
- public void nextBytes(byte[] bytes)
- {
- randomBytesUsed += bytes.length;
- counter++;
- secureRandomSpi.engineNextBytes(bytes);
- }
-
- /**
- Generates an integer containing the user specified
- number of random bits. It is right justified and padded
- with zeros.
-
- @param numBits number of random bits to get, 0 <= numBits <= 32;
-
- @return the random bits
- */
- protected final int next(int numBits)
- {
- if (numBits == 0)
- return 0;
-
- byte tmp[] = new byte[numBits / 8 + (1 * (numBits % 8))];
-
- secureRandomSpi.engineNextBytes(tmp);
- randomBytesUsed += tmp.length;
- counter++;
-
- int ret = 0;
-
- for (int i = 0; i < tmp.length; i++)
- ret |= tmp[i] << (8 * i);
-
- return ret;
- }
-
- /**
- Returns the given number of seed bytes. This method is
- maintained only for backwards capability.
-
- @param numBytes number of seed bytes to get
-
- @return an array containing the seed bytes
- */
- public static byte[] getSeed(int numBytes)
- {
- byte tmp[] = new byte[numBytes];
-
- new Random().nextBytes(tmp);
- return tmp;
- //return secureRandomSpi.engineGenerateSeed( numBytes );
- }
-
- /**
- Returns the specified number of seed bytes.
-
- @param numBytes number of seed bytes to get
-
- @return an array containing the seed bytes
- */
- public byte[] generateSeed(int numBytes)
- {
- return secureRandomSpi.engineGenerateSeed(numBytes);
- }
-
-}
projects / msp430-gcc.git / blobdiff