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package sun.security.provider;

import java.io.*;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.AlgorithmParameters;
import java.security.spec.DSAParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import java.security.interfaces.DSAParams;

import sun.security.x509.AlgIdDSA;
import sun.security.pkcs.PKCS8Key;
import sun.security.util.DerValue;
import sun.security.util.DerInputStream;

A PKCS#8 private key for the Digital Signature Algorithm.
Author:Benjamin Renaud
See Also:
/** * A PKCS#8 private key for the Digital Signature Algorithm. * * @author Benjamin Renaud * * * @see DSAPublicKey * @see AlgIdDSA * @see DSA */
public final class DSAPrivateKey extends PKCS8Key implements java.security.interfaces.DSAPrivateKey, Serializable {
use serialVersionUID from JDK 1.1. for interoperability
/** use serialVersionUID from JDK 1.1. for interoperability */
@java.io.Serial private static final long serialVersionUID = -3244453684193605938L; /* the private key */ private BigInteger x;
Make a DSA private key out of a private key and three parameters.
/** * Make a DSA private key out of a private key and three parameters. */
public DSAPrivateKey(BigInteger x, BigInteger p, BigInteger q, BigInteger g) { this.x = x; algid = new AlgIdDSA(p, q, g); try { key = new DerValue(DerValue.tag_Integer, x.toByteArray()).toByteArray(); } catch (IOException e) { throw new AssertionError("Should not happen", e); } }
Make a DSA private key from its DER encoding (PKCS #8).
/** * Make a DSA private key from its DER encoding (PKCS #8). */
public DSAPrivateKey(byte[] encoded) throws InvalidKeyException { super(encoded); try { DerInputStream in = new DerInputStream(key); x = in.getBigInteger(); } catch (IOException e) { throw new InvalidKeyException(e.getMessage(), e); } }
Returns the DSA parameters associated with this key, or null if the parameters could not be parsed.
/** * Returns the DSA parameters associated with this key, or null if the * parameters could not be parsed. */
public DSAParams getParams() { try { if (algid instanceof DSAParams) { return (DSAParams)algid; } else { DSAParameterSpec paramSpec; AlgorithmParameters algParams = algid.getParameters(); if (algParams == null) { return null; } paramSpec = algParams.getParameterSpec(DSAParameterSpec.class); return paramSpec; } } catch (InvalidParameterSpecException e) { return null; } }
Get the raw private key, x, without the parameters.
/** * Get the raw private key, x, without the parameters. */
public BigInteger getX() { return x; } }