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Diffstat (limited to 'libjava/gnu/java/security/provider/DSAParameters.java')
-rw-r--r-- | libjava/gnu/java/security/provider/DSAParameters.java | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/libjava/gnu/java/security/provider/DSAParameters.java b/libjava/gnu/java/security/provider/DSAParameters.java new file mode 100644 index 00000000000..a8f998b2cf0 --- /dev/null +++ b/libjava/gnu/java/security/provider/DSAParameters.java @@ -0,0 +1,141 @@ +/* DSAParameters.java --- DSA Parameters Implementation + 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.io.IOException; +import java.math.BigInteger; +import java.security.AlgorithmParametersSpi; +import java.security.InvalidAlgorithmParameterException; +import java.security.spec.AlgorithmParameterSpec; +import java.security.spec.DSAParameterSpec; +import java.security.spec.InvalidParameterSpecException; +import java.util.Random; +import gnu.java.security.der.DEREncodingException; + +import gnu.java.security.util.Prime; + +/* + ASN.1 Encoding for DSA from rfc2459 + + id-dsa ID ::= { iso(1) member-body(2) us(840) x9-57(10040) + x9cm(4) 1 } + + Dss-Parms ::= SEQUENCE { + p INTEGER, + q INTEGER, + g INTEGER } + +*/ +public class DSAParameters extends AlgorithmParametersSpi +{ +private BigInteger q; // the small prime +private BigInteger p; // the big prime +private BigInteger g; + + +public void engineInit(AlgorithmParameterSpec paramSpec) + throws InvalidParameterSpecException +{ + if( paramSpec instanceof DSAParameterSpec ) { + DSAParameterSpec dsaParamSpec = (DSAParameterSpec)paramSpec; + p = dsaParamSpec.getP(); + q = dsaParamSpec.getQ(); + q = dsaParamSpec.getG(); + } + else + throw new InvalidParameterSpecException("Only accepts DSAParameterSpec"); +} + +public void engineInit(byte[] params) + throws IOException +{ + DERReader reader = new DERReader( params ); + try { + + p = reader.getBigInteger(); + q = reader.getBigInteger(); + g = reader.getBigInteger(); + + } catch ( DEREncodingException DERee) { + throw new IOException("Invalid Format: Only accepts ASN.1"); + } +} + +public void engineInit(byte[] params, String format) + throws IOException +{ + if( !format.equals("ASN.1") ) + throw new IOException("Invalid Format: Only accepts ASN.1"); + engineInit( params ); +} + +public AlgorithmParameterSpec engineGetParameterSpec(Class paramSpec) + throws InvalidParameterSpecException +{ + if( paramSpec.isAssignableFrom(DSAParameterSpec.class) ) + return new DSAParameterSpec(p, q, g); + else + throw new InvalidParameterSpecException("Only accepts DSAParameterSpec"); +} + +public byte[] engineGetEncoded() + throws IOException +{ + DERWriter writer = new DERWriter(); + return writer.joinarrays( writer.writeBigInteger(p), + writer.writeBigInteger(q), + writer.writeBigInteger(g) ); +} + + +public byte[] engineGetEncoded(String format) + throws IOException +{ + if( !format.equals("ASN.1") ) + throw new IOException("Invalid Format: Only accepts ASN.1"); + return engineGetEncoded(); +} + +public String engineToString() +{ + String lineSeparator = System.getProperty("line.seperator"); + return ("q: " + q + lineSeparator + "p: " + p + lineSeparator + "g:" + g); +} + +} |