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// --- BEGIN COPYRIGHT BLOCK ---
// This program 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; version 2 of the License.
//
// This program 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 this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.provider;
import java.io.IOException;
import java.math.BigInteger;
import java.security.AlgorithmParametersSpi;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.DSAParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import netscape.security.util.BigInt;
import netscape.security.util.DerOutputStream;
import netscape.security.util.DerValue;
/**
* This class implements the parameter set used by the
* Digital Signature Algorithm as specified in the FIPS 186
* standard.
*
* @author Jan Luehe
*
* @version 1.8, 97/12/10
*
* @since JDK1.2
*/
public class DSAParameters extends AlgorithmParametersSpi {
// the prime (p)
protected BigInteger p;
// the sub-prime (q)
protected BigInteger q;
// the base (g)
protected BigInteger g;
protected void engineInit(AlgorithmParameterSpec paramSpec)
throws InvalidParameterSpecException {
if (!(paramSpec instanceof DSAParameterSpec)) {
throw new InvalidParameterSpecException("Inappropriate parameter specification");
}
this.p = ((DSAParameterSpec) paramSpec).getP();
this.q = ((DSAParameterSpec) paramSpec).getQ();
this.g = ((DSAParameterSpec) paramSpec).getG();
}
protected void engineInit(byte[] params) throws IOException {
DerValue encodedParams = new DerValue(params);
if (encodedParams.tag != DerValue.tag_Sequence) {
throw new IOException("DSA params parsing error");
}
encodedParams.data.reset();
this.p = encodedParams.data.getInteger().toBigInteger();
this.q = encodedParams.data.getInteger().toBigInteger();
this.g = encodedParams.data.getInteger().toBigInteger();
if (encodedParams.data.available() != 0) {
throw new IOException("encoded params have " +
encodedParams.data.available() +
" extra bytes");
}
}
protected void engineInit(byte[] params, String decodingMethod)
throws IOException {
engineInit(params);
}
@SuppressWarnings("unchecked")
protected <T extends AlgorithmParameterSpec> T engineGetParameterSpec(Class<T> paramSpec)
throws InvalidParameterSpecException {
try {
Class<?> dsaParamSpec = Class.forName
("java.security.spec.DSAParameterSpec");
if (dsaParamSpec.isAssignableFrom(paramSpec)) {
return (T) new DSAParameterSpec(this.p, this.q, this.g);
} else {
throw new InvalidParameterSpecException("Inappropriate parameter Specification");
}
} catch (ClassNotFoundException e) {
throw new InvalidParameterSpecException("Unsupported parameter specification: " + e.getMessage());
}
}
protected byte[] engineGetEncoded() throws IOException {
DerOutputStream out = new DerOutputStream();
DerOutputStream bytes = new DerOutputStream();
bytes.putInteger(new BigInt(p.toByteArray()));
bytes.putInteger(new BigInt(q.toByteArray()));
bytes.putInteger(new BigInt(g.toByteArray()));
out.write(DerValue.tag_Sequence, bytes);
return out.toByteArray();
}
protected byte[] engineGetEncoded(String encodingMethod)
throws IOException {
return engineGetEncoded();
}
/*
* Returns a formatted string describing the parameters.
*/
protected String engineToString() {
return "\n\tp: " + new BigInt(p).toString()
+ "\n\tq: " + new BigInt(q).toString()
+ "\n\tg: " + new BigInt(g).toString()
+ "\n";
}
}
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