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1 files changed, 174 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/java/security/prng/IRandom.java b/libjava/classpath/gnu/java/security/prng/IRandom.java
new file mode 100644
index 000000000..eb1495dd8
--- /dev/null
+++ b/libjava/classpath/gnu/java/security/prng/IRandom.java
@@ -0,0 +1,174 @@
+/* IRandom.java --
+   Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
+
+This file is a 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 of the License, 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; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+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 gnu.java.security.prng;
+
+import java.util.Map;
+
+/**
+ * The basic visible methods of any pseudo-random number generator.
+ * <p>
+ * The [HAC] defines a PRNG (as implemented in this library) as follows:
+ * <ul>
+ * <li>"5.6 Definition: A pseudorandom bit generator (PRBG) is said to pass the
+ * <em>next-bit test</em> if there is no polynomial-time algorithm which, on
+ * input of the first <code>L</code> bits of an output sequence <code>S</code>,
+ * can predict the <code>(L+1)</code><sup>st</sup> bit of <code>S</code> with a
+ * probability significantly greater than <code>1/2</code>."</li>
+ * <li>"5.8 Definition: A PRBG that passes the <em>next-bit test</em>
+ * (possibly under some plausible but unproved mathematical assumption such as
+ * the intractability of factoring integers) is called a <em>cryptographically
+ * secure pseudorandom bit generator</em> (CSPRBG)."</li>
+ * </ul>
+ * <p>
+ * <b>IMPLEMENTATION NOTE</b>: Although all the concrete classes in this
+ * package implement the {@link Cloneable} interface, it is important to note
+ * here that such an operation, for those algorithms that use an underlying
+ * symmetric key block cipher, <b>DOES NOT</b> clone any session key material
+ * that may have been used in initialising the source PRNG (the instance to be
+ * cloned). Instead a clone of an already initialised PRNG, that uses an
+ * underlying symmetric key block cipher, is another instance with a clone of
+ * the same cipher that operates with the <b>same block size</b> but without
+ * any knowledge of neither key material nor key size.
+ * <p>
+ * References:
+ * <ol>
+ * <li><a href="http://www.cacr.math.uwaterloo.ca/hac">[HAC]</a>: Handbook of
+ * Applied Cryptography.<br>
+ * CRC Press, Inc. ISBN 0-8493-8523-7, 1997<br>
+ * Menezes, A., van Oorschot, P. and S. Vanstone.</li>
+ * </ol>
+ */
+public interface IRandom
+    extends Cloneable
+{
+  /**
+   * Returns the canonical name of this instance.
+   *
+   * @return the canonical name of this instance.
+   */
+  String name();
+
+  /**
+   * Initialises the pseudo-random number generator scheme with the appropriate
+   * attributes.
+   *
+   * @param attributes a set of name-value pairs that describe the desired
+   *          future instance behaviour.
+   * @exception IllegalArgumentException if at least one of the defined name/
+   *              value pairs contains invalid data.
+   */
+  void init(Map attributes);
+
+  /**
+   * Returns the next 8 bits of random data generated from this instance.
+   *
+   * @return the next 8 bits of random data generated from this instance.
+   * @exception IllegalStateException if the instance is not yet initialised.
+   * @exception LimitReachedException if this instance has reached its
+   *              theoretical limit for generating non-repetitive pseudo-random
+   *              data.
+   */
+  byte nextByte() throws IllegalStateException, LimitReachedException;
+
+  /**
+   * Fills the designated byte array, starting from byte at index
+   * <code>offset</code>, for a maximum of <code>length</code> bytes with
+   * the output of this generator instance.
+   *
+   * @param out the placeholder to contain the generated random bytes.
+   * @param offset the starting index in <i>out</i> to consider. This method
+   *          does nothing if this parameter is not within <code>0</code> and
+   *          <code>out.length</code>.
+   * @param length the maximum number of required random bytes. This method does
+   *          nothing if this parameter is less than <code>1</code>.
+   * @exception IllegalStateException if the instance is not yet initialised.
+   * @exception LimitReachedException if this instance has reached its
+   *              theoretical limit for generating non-repetitive pseudo-random
+   *              data.
+   */
+  void nextBytes(byte[] out, int offset, int length)
+      throws IllegalStateException, LimitReachedException;
+
+  /**
+   * Supplement, or possibly replace, the random state of this PRNG with a
+   * random byte.
+   * <p>
+   * Implementations are not required to implement this method in any meaningful
+   * way; this may be a no-operation, and implementations may throw an
+   * {@link UnsupportedOperationException}.
+   *
+   * @param b The byte to add.
+   */
+  void addRandomByte(byte b);
+
+  /**
+   * Supplement, or possibly replace, the random state of this PRNG with a
+   * sequence of new random bytes.
+   * <p>
+   * Implementations are not required to implement this method in any meaningful
+   * way; this may be a no-operation, and implementations may throw an
+   * {@link UnsupportedOperationException}.
+   *
+   * @param in The buffer of new random bytes to add.
+   */
+  void addRandomBytes(byte[] in);
+
+  /**
+   * Supplement, or possibly replace, the random state of this PRNG with a
+   * sequence of new random bytes.
+   * <p>
+   * Implementations are not required to implement this method in any meaningful
+   * way; this may be a no-operation, and implementations may throw an
+   * {@link UnsupportedOperationException}.
+   *
+   * @param in The buffer of new random bytes to add.
+   * @param offset The offset from whence to begin reading random bytes.
+   * @param length The number of random bytes to add.
+   * @exception IndexOutOfBoundsException If <i>offset</i>, <i>length</i>, or
+   *              <i>offset</i>+<i>length</i> is out of bounds.
+   */
+  void addRandomBytes(byte[] in, int offset, int length);
+
+  /**
+   * Returns a clone copy of this instance.
+   *
+   * @return a clone copy of this instance.
+   */
+  Object clone() throws CloneNotSupportedException;
+}