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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/security/jce/sig/DSSParametersGenerator.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/security/jce/sig/DSSParametersGenerator.java')
-rw-r--r-- | libjava/classpath/gnu/java/security/jce/sig/DSSParametersGenerator.java | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/jce/sig/DSSParametersGenerator.java b/libjava/classpath/gnu/java/security/jce/sig/DSSParametersGenerator.java new file mode 100644 index 000000000..09c138610 --- /dev/null +++ b/libjava/classpath/gnu/java/security/jce/sig/DSSParametersGenerator.java @@ -0,0 +1,125 @@ +/* DSSParametersGenerator.java -- JCE Adapter for a generator of DSS parameters + Copyright (C) 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 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.jce.sig; + +import gnu.java.security.Registry; +import gnu.java.security.key.dss.DSSKeyPairGenerator; +import gnu.java.security.key.dss.FIPS186; +import gnu.java.security.provider.Gnu; + +import java.math.BigInteger; +import java.security.AlgorithmParameterGeneratorSpi; +import java.security.AlgorithmParameters; +import java.security.InvalidAlgorithmParameterException; +import java.security.InvalidParameterException; +import java.security.NoSuchAlgorithmException; +import java.security.Provider; +import java.security.SecureRandom; +import java.security.spec.AlgorithmParameterSpec; +import java.security.spec.DSAParameterSpec; +import java.security.spec.InvalidParameterSpecException; + +/** + * A JCE Adapter for a generator of DSS parameters. + */ +public class DSSParametersGenerator + extends AlgorithmParameterGeneratorSpi +{ + private static final Provider GNU = new Gnu(); + + /** Size of the public modulus in bits. */ + private int modulusLength = -1; + + /** User specified source of randomness. */ + private SecureRandom rnd; + + /** Our concrete DSS parameters generator. */ + private FIPS186 fips; + + // default 0-arguments constructor + + protected void engineInit(int size, SecureRandom random) + { + if ((size % 64) != 0 || size < 512 || size > 1024) + throw new InvalidParameterException("Modulus size/length (in bits) MUST " + + "be a multiple of 64, greater than " + + "or equal to 512, and less than or " + + "equal to 1024"); + this.modulusLength = size; + this.rnd = random; + } + + protected void engineInit(AlgorithmParameterSpec spec, SecureRandom random) + throws InvalidAlgorithmParameterException + { + if (! (spec instanceof DSAParameterSpec)) + throw new InvalidAlgorithmParameterException("Wrong AlgorithmParameterSpec type: " + + spec.getClass().getName()); + DSAParameterSpec dsaSpec = (DSAParameterSpec) spec; + BigInteger p = dsaSpec.getP(); + int size = p.bitLength(); + this.engineInit(size, random); + } + + protected AlgorithmParameters engineGenerateParameters() + { + if (modulusLength < 1) + modulusLength = DSSKeyPairGenerator.DEFAULT_MODULUS_LENGTH; + + fips = new FIPS186(modulusLength, rnd); + BigInteger[] params = fips.generateParameters(); + BigInteger p = params[3]; + BigInteger q = params[2]; + BigInteger g = params[5]; + DSAParameterSpec spec = new DSAParameterSpec(p, q, g); + AlgorithmParameters result = null; + try + { + result = AlgorithmParameters.getInstance(Registry.DSS_KPG, GNU); + result.init(spec); + } + catch (NoSuchAlgorithmException ignore) + { + } + catch (InvalidParameterSpecException ignore) + { + } + return result; + } +} |