/* SecureRandom.java --- Secure Random class implmentation
- Copyright (C) 1999, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
This file is part of GNU Classpath.
//Serialized Field
long counter = 0; //Serialized
- MessageDigest digest = null;
Provider provider = null;
byte[] randomBytes = null; //Always null
int randomBytesUsed = 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;
+ e = p[i].propertyNames();
+ while (e.hasMoreElements())
+ {
+ key = (String) e.nextElement();
+ if (key.startsWith("SECURERANDOM."))
+ {
+ if ((classname = p[i].getProperty(key)) != null)
+ {
+ try
+ {
+ secureRandomSpi = (SecureRandomSpi) Class.
+ forName(classname).newInstance();
+ provider = p[i];
+ return;
+ }
+ catch (Throwable ignore) { }
+ }
+ }
}
- 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");
- }
+ // Nothing found. Fall back to SHA1PRNG
+ secureRandomSpi = new gnu.java.security.provider.SHA1PRNG();
}
/**
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)
+ for (int i = 0; i < p.length; i++)
{
- throw new NoSuchAlgorithmException("Illegal Access");
+ try
+ {
+ return getInstance(algorithm, p[i]);
+ }
+ catch (NoSuchAlgorithmException ignored) { }
}
+ // None found.
+ throw new NoSuchAlgorithmException(algorithm);
}
/**
Provider p = Security.getProvider(provider);
if (p == null)
throw new NoSuchProviderException();
+
+ return getInstance(algorithm, p);
+ }
- //Format of Key: SecureRandom.algName
- StringBuffer key = new StringBuffer("SecureRandom.");
- key.append(algorithm);
+ /**
+ Returns an instance of a SecureRandom. It creates the class for
+ the specified algorithm from the given provider.
- String classname = p.getProperty(key.toString());
- if (classname == null)
- throw new NoSuchAlgorithmException();
+ @param algorithm The SecureRandom algorithm to create.
+ @param provider The provider to get the instance from.
- 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)
+ @throws NoSuchAlgorithmException If the algorithm cannot be found, or
+ if the class cannot be instantiated.
+ */
+ public static SecureRandom getInstance(String algorithm,
+ Provider provider) throws
+ NoSuchAlgorithmException
+ {
+ return getInstance(algorithm, provider, true);
+ }
+
+ /**
+ Creates the instance of SecureRandom, recursing to resolve aliases.
+
+ @param algorithm The SecureRandom algorithm to create.
+ @param provider The provider to get the implementation from.
+ @param recurse Whether or not to recurse to resolve aliases.
+
+ @throws NoSuchAlgorithmException If the algorithm cannot be found,
+ if there are too many aliases, or if the class cannot be
+ instantiated.
+ */
+ private static SecureRandom getInstance(String algorithm,
+ Provider provider,
+ boolean recurse)
+ throws NoSuchAlgorithmException
+ {
+ String msg = algorithm;
+ for (Enumeration e = provider.propertyNames(); e.hasMoreElements(); )
{
- throw new NoSuchAlgorithmException("Illegal Access");
+ // We could replace the boolean with an integer, incrementing it
+ // every
+ String key = (String) e.nextElement();
+ if (key.startsWith("SECURERANDOM.")
+ && key.substring(13).equalsIgnoreCase(algorithm))
+ {
+ try
+ {
+ Class c = Class.forName(provider.getProperty(key));
+ return new SecureRandom((SecureRandomSpi) c.newInstance(),
+ provider);
+ }
+ catch (Throwable ignored) { }
+ }
+ else if (key.startsWith("ALG.ALIAS.SECURERANDOM.")
+ && key.substring(23).equalsIgnoreCase(algorithm) && recurse)
+ {
+ try
+ {
+ // First see if this alias refers to a class in this
+ // provider.
+ return getInstance(provider.getProperty(key), provider, false);
+ }
+ catch (NoSuchAlgorithmException nsae)
+ {
+ Provider[] provs = Security.getProviders();
+ for (int i = 0; i < provs.length; i++)
+ {
+ if (provs[i] == provider)
+ continue;
+ // Now try other providers for the implementation
+ try
+ {
+ return getInstance(provider.getProperty(key),
+ provs[i], false);
+ }
+ catch (NoSuchAlgorithmException nsae2)
+ {
+ msg = nsae2.getMessage();
+ }
+ }
+ }
+ }
}
-
+ throw new NoSuchAlgorithmException(algorithm);
}
/**
projects / gcc.git / commitdiff