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-rw-r--r--libjava/java/security/SecureRandom.java349
1 files changed, 336 insertions, 13 deletions
diff --git a/libjava/java/security/SecureRandom.java b/libjava/java/security/SecureRandom.java
index 6f396dc..39a3947 100644
--- a/libjava/java/security/SecureRandom.java
+++ b/libjava/java/security/SecureRandom.java
@@ -1,25 +1,348 @@
-/* Copyright (C) 2000 Free Software Foundation
+/* SecureRandom.java --- Secure Random class implmentation
+ Copyright (C) 1999 Free Software Foundation, Inc.
- This file is part of libgcj.
+This file is part of GNU Classpath.
-This software is copyrighted work licensed under the terms of the
-Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
-details. */
+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.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
package java.security;
+import java.io.Serializable;
import java.util.Random;
+import java.util.Enumeration;
/**
- * @author Warren Levy <warrenl@cygnus.com>
- * @date February 7, 2000.
- */
+ 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.
-/**
- * Written using on-line Java Platform 1.2 API Specification.
- * Status: Stubbed.
+ @author Mark Benvenuto <ivymccough@worldnet.att.net>
*/
-
public class SecureRandom extends Random
{
- // FIXME: Stubbed.
+ //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 compatability 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 compatability 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)
+ {
+ 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);
+ }
+
}
generated by cgit v1.1 at 2025-05-29 05:52:25 +0000