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	/*
	* Copyright (c) 2001, 2019, 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.security.interfaces.RSAPublicKey;
	import java.security.spec.*;
	import javax.crypto.*;

	/**
	* This class contains a few static methods for interaction with the JCA/JCE
	* to obtain implementations, etc.
	*
	* @author Andreas Sterbenz
	*/
	final class JsseJce {
	static final boolean ALLOW_ECC =
	Utilities.getBooleanProperty("com.sun.net.ssl.enableECC", true);

	/**
	* JCE transformation string for RSA with PKCS#1 v1.5 padding.
	* Can be used for encryption, decryption, signing, verifying.
	*/
	static final String CIPHER_RSA_PKCS1 = "RSA/ECB/PKCS1Padding";

	/**
	* JCE transformation string for the stream cipher RC4.
	*/
	static final String CIPHER_RC4 = "RC4";

	/**
	* JCE transformation string for DES in CBC mode without padding.
	*/
	static final String CIPHER_DES = "DES/CBC/NoPadding";

	/**
	* JCE transformation string for (3-key) Triple DES in CBC mode
	* without padding.
	*/
	static final String CIPHER_3DES = "DESede/CBC/NoPadding";

	/**
	* JCE transformation string for AES in CBC mode
	* without padding.
	*/
	static final String CIPHER_AES = "AES/CBC/NoPadding";

	/**
	* JCE transformation string for AES in GCM mode
	* without padding.
	*/
	static final String CIPHER_AES_GCM = "AES/GCM/NoPadding";

	/**
	* JCE transformation string for ChaCha20-Poly1305
	*/
	static final String CIPHER_CHACHA20_POLY1305 = "ChaCha20-Poly1305";

	/**
	* JCA identifier string for DSA, i.e. a DSA with SHA-1.
	*/
	static final String SIGNATURE_DSA = "DSA";

	/**
	* JCA identifier string for ECDSA, i.e. a ECDSA with SHA-1.
	*/
	static final String SIGNATURE_ECDSA = "SHA1withECDSA";

	/**
	* JCA identifier for EdDSA signatures.
	*/
	static final String SIGNATURE_EDDSA = "EdDSA";

	/**
	* JCA identifier string for Raw DSA, i.e. a DSA signature without
	* hashing where the application provides the SHA-1 hash of the data.
	* Note that the standard name is "NONEwithDSA" but we use "RawDSA"
	* for compatibility.
	*/
	static final String SIGNATURE_RAWDSA = "RawDSA";

	/**
	* JCA identifier string for Raw ECDSA, i.e. a DSA signature without
	* hashing where the application provides the SHA-1 hash of the data.
	*/
	static final String SIGNATURE_RAWECDSA = "NONEwithECDSA";

	/**
	* JCA identifier string for Raw RSA, i.e. a RSA PKCS#1 v1.5 signature
	* without hashing where the application provides the hash of the data.
	* Used for RSA client authentication with a 36 byte hash.
	*/
	static final String SIGNATURE_RAWRSA = "NONEwithRSA";

	/**
	* JCA identifier string for the SSL/TLS style RSA Signature. I.e.
	* an signature using RSA with PKCS#1 v1.5 padding signing a
	* concatenation of an MD5 and SHA-1 digest.
	*/
	static final String SIGNATURE_SSLRSA = "MD5andSHA1withRSA";

	private JsseJce() {
	// no instantiation of this class
	}

	static boolean isEcAvailable() {
	return EcAvailability.isAvailable;
	}

	static int getRSAKeyLength(PublicKey key) {
	BigInteger modulus;
	if (key instanceof RSAPublicKey) {
	modulus = ((RSAPublicKey)key).getModulus();
	} else {
	RSAPublicKeySpec spec = getRSAPublicKeySpec(key);
	modulus = spec.getModulus();
	}
	return modulus.bitLength();
	}

	static RSAPublicKeySpec getRSAPublicKeySpec(PublicKey key) {
	if (key instanceof RSAPublicKey) {
	RSAPublicKey rsaKey = (RSAPublicKey)key;
	return new RSAPublicKeySpec(rsaKey.getModulus(),
	rsaKey.getPublicExponent());
	}
	try {
	KeyFactory factory = KeyFactory.getInstance("RSA");
	return factory.getKeySpec(key, RSAPublicKeySpec.class);
	} catch (Exception e) {
	throw new RuntimeException(e);
	}
	}

	// lazy initialization holder class idiom for static default parameters
	//
	// See Effective Java Second Edition: Item 71.
	private static class EcAvailability {
	// Is EC crypto available?
	private static final boolean isAvailable;

	static {
	boolean mediator = true;
	try {
	Signature.getInstance(SIGNATURE_ECDSA);
	Signature.getInstance(SIGNATURE_RAWECDSA);
	KeyAgreement.getInstance("ECDH");
	KeyFactory.getInstance("EC");
	KeyPairGenerator.getInstance("EC");
	AlgorithmParameters.getInstance("EC");
	} catch (Exception e) {
	mediator = false;
	}

	isAvailable = mediator;
	}
	}
	}

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