/*
* Copyright (c) 2003, 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.provider;
import java.util.*;
import java.math.BigInteger;
import java.security.*;
import java.security.SecureRandom;
import java.security.spec.*;
import javax.crypto.spec.DHParameterSpec;
/**
* Cache for DSA and DH parameter specs. Used by the KeyPairGenerators
* in the Sun, SunJCE, and SunPKCS11 provider if no parameters have been
* explicitly specified by the application.
*
* @author Andreas Sterbenz
* @since 1.5
*/
public final class ParameterCache {
private ParameterCache() {
// empty
}
// cache of DSA parameters
private final static Map<Integer,DSAParameterSpec> dsaCache;
// cache of DH parameters
private final static Map<Integer,DHParameterSpec> dhCache;
/**
* Return cached DSA parameters for the given keylength, or null if none
* are available in the cache.
*/
public static DSAParameterSpec getCachedDSAParameterSpec(int keyLength) {
return dsaCache.get(Integer.valueOf(keyLength));
}
/**
* Return cached DH parameters for the given keylength, or null if none
* are available in the cache.
*/
public static DHParameterSpec getCachedDHParameterSpec(int keyLength) {
return dhCache.get(Integer.valueOf(keyLength));
}
/**
* Return DSA parameters for the given keylength. Uses cache if possible,
* generates new parameters and adds them to the cache otherwise.
*/
public static DSAParameterSpec getDSAParameterSpec(int keyLength,
SecureRandom random)
throws NoSuchAlgorithmException, InvalidParameterSpecException {
DSAParameterSpec spec = getCachedDSAParameterSpec(keyLength);
if (spec != null) {
return spec;
}
spec = getNewDSAParameterSpec(keyLength, random);
dsaCache.put(Integer.valueOf(keyLength), spec);
return spec;
}
/**
* Return DH parameters for the given keylength. Uses cache if possible,
* generates new parameters and adds them to the cache otherwise.
*/
public static DHParameterSpec getDHParameterSpec(int keyLength,
SecureRandom random)
throws NoSuchAlgorithmException, InvalidParameterSpecException {
DHParameterSpec spec = getCachedDHParameterSpec(keyLength);
if (spec != null) {
return spec;
}
AlgorithmParameterGenerator gen =
AlgorithmParameterGenerator.getInstance("DH");
gen.init(keyLength, random);
AlgorithmParameters params = gen.generateParameters();
spec = params.getParameterSpec(DHParameterSpec.class);
dhCache.put(Integer.valueOf(keyLength), spec);
return spec;
}
/**
* Return new DSA parameters for the given keylength. Do not lookup in
* cache and do not cache the newly generated parameters. This method
* really only exists for the legacy method
* DSAKeyPairGenerator.initialize(int, boolean, SecureRandom).
*/
public static DSAParameterSpec getNewDSAParameterSpec(int keyLength,
SecureRandom random)
throws NoSuchAlgorithmException, InvalidParameterSpecException {
AlgorithmParameterGenerator gen =
AlgorithmParameterGenerator.getInstance("DSA");
gen.init(keyLength, random);
AlgorithmParameters params = gen.generateParameters();
DSAParameterSpec spec = params.getParameterSpec(DSAParameterSpec.class);
return spec;
}
static {
// XXX change to ConcurrentHashMap once available
dhCache = Collections.synchronizedMap
(new HashMap<Integer,DHParameterSpec>());
dsaCache = Collections.synchronizedMap
(new HashMap<Integer,DSAParameterSpec>());
/*
* We support precomputed parameter for 512, 768 and 1024 bit
* moduli. In this file we provide both the seed and counter
* value of the generation process for each of these seeds,
* for validation purposes. We also include the test vectors
* from the DSA specification, FIPS 186, and the FIPS 186
* Change No 1, which updates the test vector using SHA-1
* instead of SHA (for both the G function and the message
* hash.
*/
/*
* L = 512
* SEED = b869c82b35d70e1b1ff91b28e37a62ecdc34409b
* counter = 123
*/
BigInteger p512 =
new BigInteger("fca682ce8e12caba26efccf7110e526db078b05edecb" +
"cd1eb4a208f3ae1617ae01f35b91a47e6df63413c5e1" +
"2ed0899bcd132acd50d99151bdc43ee737592e17", 16);
BigInteger q512 =
new BigInteger("962eddcc369cba8ebb260ee6b6a126d9346e38c5", 16);
BigInteger g512 =
new BigInteger("678471b27a9cf44ee91a49c5147db1a9aaf244f05a43" +
"4d6486931d2d14271b9e35030b71fd73da179069b32e" +
"2935630e1c2062354d0da20a6c416e50be794ca4", 16);
/*
* L = 768
* SEED = 77d0f8c4dad15eb8c4f2f8d6726cefd96d5bb399
* counter = 263
*/
BigInteger p768 =
new BigInteger("e9e642599d355f37c97ffd3567120b8e25c9cd43e" +
"927b3a9670fbec5d890141922d2c3b3ad24800937" +
"99869d1e846aab49fab0ad26d2ce6a22219d470bc" +
"e7d777d4a21fbe9c270b57f607002f3cef8393694" +
"cf45ee3688c11a8c56ab127a3daf", 16);
BigInteger q768 =
new BigInteger("9cdbd84c9f1ac2f38d0f80f42ab952e7338bf511",
16);
BigInteger g768 =
new BigInteger("30470ad5a005fb14ce2d9dcd87e38bc7d1b1c5fac" +
"baecbe95f190aa7a31d23c4dbbcbe06174544401a" +
"5b2c020965d8c2bd2171d3668445771f74ba084d2" +
"029d83c1c158547f3a9f1a2715be23d51ae4d3e5a" +
"1f6a7064f316933a346d3f529252", 16);
/*
* L = 1024
* SEED = 8d5155894229d5e689ee01e6018a237e2cae64cd
* counter = 92
*/
BigInteger p1024 =
new BigInteger("fd7f53811d75122952df4a9c2eece4e7f611b7523c" +
"ef4400c31e3f80b6512669455d402251fb593d8d58" +
"fabfc5f5ba30f6cb9b556cd7813b801d346ff26660" +
"b76b9950a5a49f9fe8047b1022c24fbba9d7feb7c6" +
"1bf83b57e7c6a8a6150f04fb83f6d3c51ec3023554" +
"135a169132f675f3ae2b61d72aeff22203199dd148" +
"01c7", 16);
BigInteger q1024 =
new BigInteger("9760508f15230bccb292b982a2eb840bf0581cf5",
16);
BigInteger g1024 =
new BigInteger("f7e1a085d69b3ddecbbcab5c36b857b97994afbbfa" +
"3aea82f9574c0b3d0782675159578ebad4594fe671" +
"07108180b449167123e84c281613b7cf09328cc8a6" +
"e13c167a8b547c8d28e0a3ae1e2bb3a675916ea37f" +
"0bfa213562f1fb627a01243bcca4f1bea8519089a8" +
"83dfe15ae59f06928b665e807b552564014c3bfecf" +
"492a", 16);
dsaCache.put(Integer.valueOf(512),
new DSAParameterSpec(p512, q512, g512));
dsaCache.put(Integer.valueOf(768),
new DSAParameterSpec(p768, q768, g768));
dsaCache.put(Integer.valueOf(1024),
new DSAParameterSpec(p1024, q1024, g1024));
// use DSA parameters for DH as well
dhCache.put(Integer.valueOf(512), new DHParameterSpec(p512, g512));
dhCache.put(Integer.valueOf(768), new DHParameterSpec(p768, g768));
dhCache.put(Integer.valueOf(1024), new DHParameterSpec(p1024, g1024));
}
}