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	/*
	* Copyright (c) 2017, 2018, 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.ssl;

	import java.math.BigInteger;
	import java.security.*;
	import java.util.Collections;
	import java.util.HashMap;
	import java.util.Map;
	import java.util.regex.Matcher;
	import java.util.regex.Pattern;
	import javax.crypto.spec.DHParameterSpec;

	/**
	* Predefined default DH ephemeral parameters.
	*/
	final class PredefinedDHParameterSpecs {

	//
	// Default DH ephemeral parameters
	//
	private static final BigInteger p512 = new BigInteger( // generated
	"D87780E15FF50B4ABBE89870188B049406B5BEA98AB23A02" +
	"41D88EA75B7755E669C08093D3F0CA7FC3A5A25CF067DCB9" +
	"A43DD89D1D90921C6328884461E0B6D3", 16);
	private static final BigInteger p768 = new BigInteger( // RFC 2409
	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" +
	"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" +
	"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" +
	"E485B576625E7EC6F44C42E9A63A3620FFFFFFFFFFFFFFFF", 16);

	private static final BigInteger p1024 = new BigInteger( // RFC 2409
	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" +
	"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" +
	"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" +
	"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" +
	"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381" +
	"FFFFFFFFFFFFFFFF", 16);
	private static final BigInteger p1536 = new BigInteger( // RFC 3526
	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" +
	"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" +
	"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" +
	"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" +
	"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" +
	"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" +
	"83655D23DCA3AD961C62F356208552BB9ED529077096966D" +
	"670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF", 16);
	private static final BigInteger p2048 = new BigInteger( // TLS FFDHE
	"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1" +
	"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9" +
	"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561" +
	"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935" +
	"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735" +
	"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB" +
	"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19" +
	"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61" +
	"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73" +
	"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA" +
	"886B423861285C97FFFFFFFFFFFFFFFF", 16);
	private static final BigInteger p3072 = new BigInteger( // TLS FFDHE
	"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1" +
	"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9" +
	"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561" +
	"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935" +
	"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735" +
	"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB" +
	"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19" +
	"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61" +
	"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73" +
	"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA" +
	"886B4238611FCFDCDE355B3B6519035BBC34F4DEF99C0238" +
	"61B46FC9D6E6C9077AD91D2691F7F7EE598CB0FAC186D91C" +
	"AEFE130985139270B4130C93BC437944F4FD4452E2D74DD3" +
	"64F2E21E71F54BFF5CAE82AB9C9DF69EE86D2BC522363A0D" +
	"ABC521979B0DEADA1DBF9A42D5C4484E0ABCD06BFA53DDEF" +
	"3C1B20EE3FD59D7C25E41D2B66C62E37FFFFFFFFFFFFFFFF", 16);
	private static final BigInteger p4096 = new BigInteger( // TLS FFDHE
	"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1" +
	"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9" +
	"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561" +
	"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935" +
	"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735" +
	"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB" +
	"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19" +
	"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61" +
	"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73" +
	"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA" +
	"886B4238611FCFDCDE355B3B6519035BBC34F4DEF99C0238" +
	"61B46FC9D6E6C9077AD91D2691F7F7EE598CB0FAC186D91C" +
	"AEFE130985139270B4130C93BC437944F4FD4452E2D74DD3" +
	"64F2E21E71F54BFF5CAE82AB9C9DF69EE86D2BC522363A0D" +
	"ABC521979B0DEADA1DBF9A42D5C4484E0ABCD06BFA53DDEF" +
	"3C1B20EE3FD59D7C25E41D2B669E1EF16E6F52C3164DF4FB" +
	"7930E9E4E58857B6AC7D5F42D69F6D187763CF1D55034004" +
	"87F55BA57E31CC7A7135C886EFB4318AED6A1E012D9E6832" +
	"A907600A918130C46DC778F971AD0038092999A333CB8B7A" +
	"1A1DB93D7140003C2A4ECEA9F98D0ACC0A8291CDCEC97DCF" +
	"8EC9B55A7F88A46B4DB5A851F44182E1C68A007E5E655F6A" +
	"FFFFFFFFFFFFFFFF", 16);
	private static final BigInteger p6144 = new BigInteger( // TLS FFDHE
	"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1" +
	"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9" +
	"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561" +
	"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935" +
	"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735" +
	"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB" +
	"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19" +
	"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61" +
	"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73" +
	"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA" +
	"886B4238611FCFDCDE355B3B6519035BBC34F4DEF99C0238" +
	"61B46FC9D6E6C9077AD91D2691F7F7EE598CB0FAC186D91C" +
	"AEFE130985139270B4130C93BC437944F4FD4452E2D74DD3" +
	"64F2E21E71F54BFF5CAE82AB9C9DF69EE86D2BC522363A0D" +
	"ABC521979B0DEADA1DBF9A42D5C4484E0ABCD06BFA53DDEF" +
	"3C1B20EE3FD59D7C25E41D2B669E1EF16E6F52C3164DF4FB" +
	"7930E9E4E58857B6AC7D5F42D69F6D187763CF1D55034004" +
	"87F55BA57E31CC7A7135C886EFB4318AED6A1E012D9E6832" +
	"A907600A918130C46DC778F971AD0038092999A333CB8B7A" +
	"1A1DB93D7140003C2A4ECEA9F98D0ACC0A8291CDCEC97DCF" +
	"8EC9B55A7F88A46B4DB5A851F44182E1C68A007E5E0DD902" +
	"0BFD64B645036C7A4E677D2C38532A3A23BA4442CAF53EA6" +
	"3BB454329B7624C8917BDD64B1C0FD4CB38E8C334C701C3A" +
	"CDAD0657FCCFEC719B1F5C3E4E46041F388147FB4CFDB477" +
	"A52471F7A9A96910B855322EDB6340D8A00EF092350511E3" +
	"0ABEC1FFF9E3A26E7FB29F8C183023C3587E38DA0077D9B4" +
	"763E4E4B94B2BBC194C6651E77CAF992EEAAC0232A281BF6" +
	"B3A739C1226116820AE8DB5847A67CBEF9C9091B462D538C" +
	"D72B03746AE77F5E62292C311562A846505DC82DB854338A" +
	"E49F5235C95B91178CCF2DD5CACEF403EC9D1810C6272B04" +
	"5B3B71F9DC6B80D63FDD4A8E9ADB1E6962A69526D43161C1" +
	"A41D570D7938DAD4A40E329CD0E40E65FFFFFFFFFFFFFFFF", 16);
	private static final BigInteger p8192 = new BigInteger( // TLS FFDHE
	"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1" +
	"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9" +
	"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561" +
	"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935" +
	"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735" +
	"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB" +
	"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19" +
	"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61" +
	"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73" +
	"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA" +
	"886B4238611FCFDCDE355B3B6519035BBC34F4DEF99C0238" +
	"61B46FC9D6E6C9077AD91D2691F7F7EE598CB0FAC186D91C" +
	"AEFE130985139270B4130C93BC437944F4FD4452E2D74DD3" +
	"64F2E21E71F54BFF5CAE82AB9C9DF69EE86D2BC522363A0D" +
	"ABC521979B0DEADA1DBF9A42D5C4484E0ABCD06BFA53DDEF" +
	"3C1B20EE3FD59D7C25E41D2B669E1EF16E6F52C3164DF4FB" +
	"7930E9E4E58857B6AC7D5F42D69F6D187763CF1D55034004" +
	"87F55BA57E31CC7A7135C886EFB4318AED6A1E012D9E6832" +
	"A907600A918130C46DC778F971AD0038092999A333CB8B7A" +
	"1A1DB93D7140003C2A4ECEA9F98D0ACC0A8291CDCEC97DCF" +
	"8EC9B55A7F88A46B4DB5A851F44182E1C68A007E5E0DD902" +
	"0BFD64B645036C7A4E677D2C38532A3A23BA4442CAF53EA6" +
	"3BB454329B7624C8917BDD64B1C0FD4CB38E8C334C701C3A" +
	"CDAD0657FCCFEC719B1F5C3E4E46041F388147FB4CFDB477" +
	"A52471F7A9A96910B855322EDB6340D8A00EF092350511E3" +
	"0ABEC1FFF9E3A26E7FB29F8C183023C3587E38DA0077D9B4" +
	"763E4E4B94B2BBC194C6651E77CAF992EEAAC0232A281BF6" +
	"B3A739C1226116820AE8DB5847A67CBEF9C9091B462D538C" +
	"D72B03746AE77F5E62292C311562A846505DC82DB854338A" +
	"E49F5235C95B91178CCF2DD5CACEF403EC9D1810C6272B04" +
	"5B3B71F9DC6B80D63FDD4A8E9ADB1E6962A69526D43161C1" +
	"A41D570D7938DAD4A40E329CCFF46AAA36AD004CF600C838" +
	"1E425A31D951AE64FDB23FCEC9509D43687FEB69EDD1CC5E" +
	"0B8CC3BDF64B10EF86B63142A3AB8829555B2F747C932665" +
	"CB2C0F1CC01BD70229388839D2AF05E454504AC78B758282" +
	"2846C0BA35C35F5C59160CC046FD8251541FC68C9C86B022" +
	"BB7099876A460E7451A8A93109703FEE1C217E6C3826E52C" +
	"51AA691E0E423CFC99E9E31650C1217B624816CDAD9A95F9" +
	"D5B8019488D9C0A0A1FE3075A577E23183F81D4A3F2FA457" +
	"1EFC8CE0BA8A4FE8B6855DFE72B0A66EDED2FBABFBE58A30" +
	"FAFABE1C5D71A87E2F741EF8C1FE86FEA6BBFDE530677F0D" +
	"97D11D49F7A8443D0822E506A9F4614E011E2A94838FF88C" +
	"D68C8BB7C5C6424CFFFFFFFFFFFFFFFF", 16);

	private static final BigInteger[] supportedPrimes = {
	p512, p768, p1024, p1536, p2048, p3072, p4096, p6144, p8192};

	private static final BigInteger[] ffdhePrimes = {
	p2048, p3072, p4096, p6144, p8192};

	// a measure of the uncertainty that prime modulus p is not a prime
	//
	// see BigInteger.isProbablePrime(int certainty)
	private static final int PRIME_CERTAINTY = 120;

	// the known security property, jdk.tls.server.defaultDHEParameters
	private static final String PROPERTY_NAME =
	"jdk.tls.server.defaultDHEParameters";

	private static final Pattern spacesPattern = Pattern.compile("\\s+");

	private static final Pattern syntaxPattern = Pattern.compile(
	"(\\{[0-9A-Fa-f]+,[0-9A-Fa-f]+\\})" +
	"(,\\{[0-9A-Fa-f]+,[0-9A-Fa-f]+\\})*");

	private static final Pattern paramsPattern = Pattern.compile(
	"\\{([0-9A-Fa-f]+),([0-9A-Fa-f]+)\\}");

	// cache of predefined default DH ephemeral parameters
	static final Map<Integer, DHParameterSpec> definedParams;

	// cache of Finite Field DH Ephemeral parameters (RFC 7919/FFDHE)
	static final Map<Integer, DHParameterSpec> ffdheParams;

	static {
	String property = AccessController.doPrivileged(
	new PrivilegedAction<String>() {
	public String run() {
	return Security.getProperty(PROPERTY_NAME);
	}
	});

	if (property != null && !property.isEmpty()) {
	// remove double quote marks from beginning/end of the property
	if (property.length() >= 2 && property.charAt(0) == '"' &&
	property.charAt(property.length() - 1) == '"') {
	property = property.substring(1, property.length() - 1);
	}

	property = property.trim();
	}

	if (property != null && !property.isEmpty()) {
	Matcher spacesMatcher = spacesPattern.matcher(property);
	property = spacesMatcher.replaceAll("");

	if (SSLLogger.isOn && SSLLogger.isOn("sslctx")) {
	SSLLogger.fine(
	"The Security Property " +
	PROPERTY_NAME + ": " + property);
	}
	}

	Map<Integer,DHParameterSpec> defaultParams = new HashMap<>();
	if (property != null && !property.isEmpty()) {
	Matcher syntaxMatcher = syntaxPattern.matcher(property);
	if (syntaxMatcher.matches()) {
	Matcher paramsFinder = paramsPattern.matcher(property);
	while(paramsFinder.find()) {
	String primeModulus = paramsFinder.group(1);
	BigInteger p = new BigInteger(primeModulus, 16);
	if (!p.isProbablePrime(PRIME_CERTAINTY)) {
	if (SSLLogger.isOn && SSLLogger.isOn("sslctx")) {
	SSLLogger.fine(
	"Prime modulus p in Security Property, " +
	PROPERTY_NAME + ", is not a prime: " +
	primeModulus);
	}

	continue;
	}

	String baseGenerator = paramsFinder.group(2);
	BigInteger g = new BigInteger(baseGenerator, 16);

	DHParameterSpec spec = new DHParameterSpec(p, g);
	int primeLen = p.bitLength();
	defaultParams.put(primeLen, spec);
	}
	} else if (SSLLogger.isOn && SSLLogger.isOn("sslctx")) {
	SSLLogger.fine("Invalid Security Property, " +
	PROPERTY_NAME + ", definition");
	}
	}
	BigInteger TWO = BigInteger.valueOf(2);

	Map<Integer,DHParameterSpec> tempFFDHEs = new HashMap<>();
	for (BigInteger p : ffdhePrimes) {
	int primeLen = p.bitLength();
	DHParameterSpec dhps = new DHParameterSpec(p, TWO);
	tempFFDHEs.put(primeLen, dhps);
	defaultParams.putIfAbsent(primeLen, dhps);
	}

	for (BigInteger p : supportedPrimes) {
	int primeLen = p.bitLength();
	if (defaultParams.get(primeLen) == null) {
	defaultParams.put(primeLen,
	new DHParameterSpec(p, TWO));
	}
	}

	ffdheParams =
	Collections.<Integer,DHParameterSpec>unmodifiableMap(tempFFDHEs);
	definedParams =
	Collections.<Integer,DHParameterSpec>unmodifiableMap(defaultParams);
	}
	}

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