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Diffstat (limited to 'libjava/gnu/java/security/provider/DSAKeyPairGenerator.java')
| -rw-r--r-- | libjava/gnu/java/security/provider/DSAKeyPairGenerator.java | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/libjava/gnu/java/security/provider/DSAKeyPairGenerator.java b/libjava/gnu/java/security/provider/DSAKeyPairGenerator.java new file mode 100644 index 00000000000..72f7b0eeddb --- /dev/null +++ b/libjava/gnu/java/security/provider/DSAKeyPairGenerator.java @@ -0,0 +1,173 @@ +/* GnuDSAKeyPairGenerator.java --- Gnu DSA Key Pair Generator + Copyright (C) 1999 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.security.provider; + +import java.math.BigInteger; +import java.security.AlgorithmParameters; +import java.security.AlgorithmParameterGenerator; +import java.security.KeyPairGeneratorSpi; +import java.security.KeyPair; +import java.security.SecureRandom; +import java.security.InvalidParameterException; +import java.security.InvalidAlgorithmParameterException; +import java.security.interfaces.DSAParams; +import java.security.spec.AlgorithmParameterSpec; +import java.security.spec.DSAParameterSpec; +import java.util.Random; + +import gnu.java.security.util.Prime; + +public class DSAKeyPairGenerator extends KeyPairGeneratorSpi + implements java.security.interfaces.DSAKeyPairGenerator +{ +int keysize; +SecureRandom random; +private BigInteger q = null; // the small prime +private BigInteger p = null; // the big prime +private BigInteger g = null; + +DSAKeyPairGenerator() +{ + keysize = 1024; +} + +public void initialize(int keysize, SecureRandom random) +{ + //if( ((keysize % 64) != 0) || (keysize < 512) || (keysize > 1024) ) + // throw new InvalidAlgorithmParameterException("Invalid key size"); + + this.keysize = keysize; + this.random = random; +} + +public void initialize(AlgorithmParameterSpec params, + SecureRandom random) + throws InvalidAlgorithmParameterException +{ + if( !( params instanceof DSAParameterSpec ) ) + throw new InvalidAlgorithmParameterException("Must be DSAParameterSpec"); + + DSAParameterSpec dsaparameterspec = (DSAParameterSpec)params; + p = dsaparameterspec.getP(); + q = dsaparameterspec.getQ(); + g = dsaparameterspec.getG(); + this.random = random; +} + +public void initialize(DSAParams params, SecureRandom random) + throws InvalidParameterException +{ + if(params.getP() != null) + p = params.getP(); + else + throw new InvalidParameterException(); + + if(params.getQ() != null) + q = params.getQ(); + else + throw new InvalidParameterException(); + + if(params.getG() != null) + g = params.getG(); + else + throw new InvalidParameterException(); + + this.random = random; +} + +public void initialize(int modlen, boolean genParams, SecureRandom random) + throws InvalidParameterException +{ + if( ((modlen % 64) != 0) || (modlen < 512) || (modlen > 1024) ) + throw new InvalidParameterException(); + + if( (genParams == false) && (modlen != 512) && (modlen != 768) && (modlen != 1024) ) + throw new InvalidParameterException(); + this.keysize = modlen; + this.random = random; + p = null; + q = null; + g = null; +} + +public KeyPair generateKeyPair() +{ + if( getDefaults() == false) { + try { + AlgorithmParameterGenerator apgDSA = AlgorithmParameterGenerator.getInstance("DSA"); + AlgorithmParameters apDSA = apgDSA.generateParameters(); + DSAParameterSpec dsaparameterspec = (DSAParameterSpec)apDSA.getParameterSpec( DSAParameterSpec.class ); + p = dsaparameterspec.getP(); + q = dsaparameterspec.getQ(); + g = dsaparameterspec.getG(); + } catch ( Exception e ) { + return null; + } + } + + BigInteger x = new BigInteger( 159, new Random() ); + + BigInteger y = g.modPow( x, p ); + + return new KeyPair( new GnuDSAPublicKey(y,p,q,g), new GnuDSAPrivateKey(x,p,q,g)); + //return new KeyPair( public, private ); +} + +//These constants are Sun's Constants copied from the +//Cryptography Specification +private boolean getDefaults() +{ + if( keysize == 512) { + p = new BigInteger("fca682ce8e12caba26efccf7110e526db078b05edecbcd1eb4a208f3ae1617ae01f35b91a47e6df63413c5e12ed0899bcd132acd50d99151bdc43ee737592e17", 16); + q = new BigInteger("962eddcc369cba8ebb260ee6b6a126d9346e38c5", 16); + g = new BigInteger("678471b27a9cf44ee91a49c5147db1a9aaf244f05a434d6486931d2d14271b9e35030b71fd73da179069b32e2935630e1c2062354d0da20a6c416e50be794ca4", 16); + return true; + } else if( keysize == 768) { + p = new BigInteger("e9e642599d355f37c97ffd3567120b8e25c9cd43e927b3a9670fbec5d890141922d2c3b3ad2480093799869d1e846aab49fab0ad26d2ce6a22219d470bce7d777d4a21fbe9c270b57f607002f3cef8393694cf45ee3688c11a8c56ab127a3daf", 16); + q = new BigInteger("9cdbd84c9f1ac2f38d0f80f42ab952e7338bf511", 16); + g = new BigInteger("30470ad5a005fb14ce2d9dcd87e38bc7d1b1c5facbaecbe95f190aa7a31d23c4dbbcbe06174544401a5b2c020965d8c2bd2171d3668445771f74ba084d2029d83c1c158547f3a9f1a2715be23d51ae4d3e5a1f6a7064f316933a346d3f529252", 16); + } else if( keysize == 512) { + p = new BigInteger("fd7f53811d75122952df4a9c2eece4e7f611b7523cef4400c31e3f80b6512669455d402251fb593d8d58fabfc5f5ba30f6cb9b556cd7813b801d346ff26660b76b9950a5a49f9fe8047b1022c24fbba9d7feb7c61bf83b57e7c6a8a6150f04fb83f6d3c51ec3023554135a169132f675f3ae2b61d72aeff22203199dd14801c7", 16); + q = new BigInteger("9760508f15230bccb292b982a2eb840bf0581cf5", 16); + g = new BigInteger("f7e1a085d69b3ddecbbcab5c36b857b97994afbbfa3aea82f9574c0b3d0782675159578ebad4594fe67107108180b449167123e84c281613b7cf09328cc8a6e13c167a8b547c8d28e0a3ae1e2bb3a675916ea37f0bfa213562f1fb627a01243bcca4f1bea8519089a883dfe15ae59f06928b665e807b552564014c3bfecf492a", 16); + } + return false; +} + +} |