PATCH: java.security improvements

[Casey Marshall]

Hello,

Attached is a patch for a number of classes in the java.security package
with attempts to fix and/or improve upon the `getInstance' factory
methods of MessageDigest, KeyFactory, etc. The basic idea was to replace
the bulk of each `getInstance' with a call to a new package-private
class method (and class) Engine.getInstance, which should both make
these factory methods more robust without repeating a lot of code in
each class. There is also a fix for a bias in the `next(int numBits)'
method of SecureRandom (filed as PR 9271).

One new package-private class -- java.security.Engine -- is added.
Summary of changes follows:

   * AlgorithmParameterGenerator: modify getInstance methods to use
     the Engine class; adds JDK1.4 getInstance method; getInstance
     throws an exception if provider argument is null; minor
     comment improvements or elaborations; copyright updated to
     include 2003.
   * AlgorithmParameters: likewise.
   * KeyFactory: likewise.
   * KeyPairGenerator: likewise.
   * MessageDigest: likewise.
   * Signature: likewise.
   * SecureRandom: likewise; fix for a bias in the `next(int
     numBits)' method.
   * KeyStore: modify getInstance methods to use the Engine class.
   * Engine: new package-private class with a single package-
     private class method that implements a general getInstance.
   * libjava/Makefile.am: adds java/security/Engine.java.

Cheers,

-- 
Casey Marshall || rsdio@metastatic.org
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