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	/*
	* Copyright (c) 2003, 2013, Oracle and/or its affiliates. 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. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.security.pkcs11;

	import java.math.BigInteger;
	import java.security.*;

	/**
	* Collection of static utility methods.
	*
	* @author Andreas Sterbenz
	* @since 1.5
	*/
	public final class P11Util {

	private static Object LOCK = new Object();

	private static volatile Provider sun, sunRsaSign, sunJce;

	private P11Util() {
	// empty
	}

	static Provider getSunProvider() {
	Provider p = sun;
	if (p == null) {
	synchronized (LOCK) {
	p = getProvider
	(sun, "SUN", "sun.security.provider.Sun");
	sun = p;
	}
	}
	return p;
	}

	static Provider getSunRsaSignProvider() {
	Provider p = sunRsaSign;
	if (p == null) {
	synchronized (LOCK) {
	p = getProvider
	(sunRsaSign, "SunRsaSign", "sun.security.rsa.SunRsaSign");
	sunRsaSign = p;
	}
	}
	return p;
	}

	static Provider getSunJceProvider() {
	Provider p = sunJce;
	if (p == null) {
	synchronized (LOCK) {
	p = getProvider
	(sunJce, "SunJCE", "com.sun.crypto.provider.SunJCE");
	sunJce = p;
	}
	}
	return p;
	}

	private static Provider getProvider(Provider p, String providerName,
	String className) {
	if (p != null) {
	return p;
	}
	p = Security.getProvider(providerName);
	if (p == null) {
	try {
	Class<?> clazz = Class.forName(className);
	p = (Provider)clazz.newInstance();
	} catch (Exception e) {
	throw new ProviderException
	("Could not find provider " + providerName, e);
	}
	}
	return p;
	}

	static byte[] convert(byte[] input, int offset, int len) {
	if ((offset == 0) && (len == input.length)) {
	return input;
	} else {
	byte[] t = new byte[len];
	System.arraycopy(input, offset, t, 0, len);
	return t;
	}
	}

	static byte[] subarray(byte[] b, int ofs, int len) {
	byte[] out = new byte[len];
	System.arraycopy(b, ofs, out, 0, len);
	return out;
	}

	static byte[] concat(byte[] b1, byte[] b2) {
	byte[] b = new byte[b1.length + b2.length];
	System.arraycopy(b1, 0, b, 0, b1.length);
	System.arraycopy(b2, 0, b, b1.length, b2.length);
	return b;
	}

	static long[] concat(long[] b1, long[] b2) {
	if (b1.length == 0) {
	return b2;
	}
	long[] b = new long[b1.length + b2.length];
	System.arraycopy(b1, 0, b, 0, b1.length);
	System.arraycopy(b2, 0, b, b1.length, b2.length);
	return b;
	}

	public static byte[] getMagnitude(BigInteger bi) {
	byte[] b = bi.toByteArray();
	if ((b.length > 1) && (b[0] == 0)) {
	int n = b.length - 1;
	byte[] newarray = new byte[n];
	System.arraycopy(b, 1, newarray, 0, n);
	b = newarray;
	}
	return b;
	}

	static byte[] getBytesUTF8(String s) {
	try {
	return s.getBytes("UTF8");
	} catch (java.io.UnsupportedEncodingException e) {
	throw new RuntimeException(e);
	}
	}

	static byte[] sha1(byte[] data) {
	try {
	MessageDigest md = MessageDigest.getInstance("SHA-1");
	md.update(data);
	return md.digest();
	} catch (GeneralSecurityException e) {
	throw new ProviderException(e);
	}
	}

	private final static char[] hexDigits = "0123456789abcdef".toCharArray();

	static String toString(byte[] b) {
	if (b == null) {
	return "(null)";
	}
	StringBuffer sb = new StringBuffer(b.length * 3);
	for (int i = 0; i < b.length; i++) {
	int k = b[i] & 0xff;
	if (i != 0) {
	sb.append(':');
	}
	sb.append(hexDigits[k >>> 4]);
	sb.append(hexDigits[k & 0xf]);
	}
	return sb.toString();
	}

	}

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