--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/windows/classes/sun/security/provider/NativeSeedGenerator.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package sun.security.provider;
+
+import java.io.IOException;
+
+/**
+ * Seed generator for Windows making use of MS CryptoAPI using native code.
+ *
+ */
+class NativeSeedGenerator extends SeedGenerator {
+
+    /**
+     * Create a new CryptoAPI seed generator instances.
+     *
+     * @exception IOException if CryptoAPI seeds are not available
+     * on this platform.
+     */
+    NativeSeedGenerator() throws IOException {
+        super();
+        // try generating two random bytes to see if CAPI is available
+        if (!nativeGenerateSeed(new byte[2])) {
+            throw new IOException("Required native CryptoAPI features not "
+                                  + " available on this machine");
+        }
+    }
+
+    /**
+     * Native method to do the actual work.
+     */
+    private static native boolean nativeGenerateSeed(byte[] result);
+
+    void getSeedBytes(byte[] result) {
+        // fill array as a side effect
+        if (nativeGenerateSeed(result) == false) {
+            // should never happen if constructor check succeeds
+            throw new InternalError
+                            ("Unexpected CryptoAPI failure generating seed");
+        }
+    }
+
+    byte getSeedByte() {
+        byte[] b = new byte[1];
+        getSeedBytes(b);
+        return b[0];
+    }
+}