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      1 package org.bouncycastle.jcajce.provider.asymmetric.dsa;
      2 
      3 import java.io.IOException;
      4 import java.io.ObjectInputStream;
      5 import java.io.ObjectOutputStream;
      6 import java.math.BigInteger;
      7 import java.security.interfaces.DSAParams;
      8 import java.security.interfaces.DSAPrivateKey;
      9 import java.security.spec.DSAParameterSpec;
     10 import java.security.spec.DSAPrivateKeySpec;
     11 import java.util.Enumeration;
     12 
     13 import org.bouncycastle.asn1.ASN1Encodable;
     14 import org.bouncycastle.asn1.ASN1Integer;
     15 import org.bouncycastle.asn1.ASN1ObjectIdentifier;
     16 import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
     17 import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
     18 import org.bouncycastle.asn1.x509.DSAParameter;
     19 import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
     20 import org.bouncycastle.crypto.params.DSAPrivateKeyParameters;
     21 import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
     22 import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
     23 import org.bouncycastle.jce.interfaces.PKCS12BagAttributeCarrier;
     24 
     25 public class BCDSAPrivateKey
     26     implements DSAPrivateKey, PKCS12BagAttributeCarrier
     27 {
     28     private static final long serialVersionUID = -4677259546958385734L;
     29 
     30     private BigInteger          x;
     31     private transient DSAParams dsaSpec;
     32 
     33     private transient PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl();
     34 
     35     protected BCDSAPrivateKey()
     36     {
     37     }
     38 
     39     BCDSAPrivateKey(
     40         DSAPrivateKey key)
     41     {
     42         this.x = key.getX();
     43         this.dsaSpec = key.getParams();
     44     }
     45 
     46     BCDSAPrivateKey(
     47         DSAPrivateKeySpec spec)
     48     {
     49         this.x = spec.getX();
     50         this.dsaSpec = new DSAParameterSpec(spec.getP(), spec.getQ(), spec.getG());
     51     }
     52 
     53     public BCDSAPrivateKey(
     54         PrivateKeyInfo info)
     55         throws IOException
     56     {
     57         DSAParameter    params = DSAParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters());
     58         ASN1Integer      derX = (ASN1Integer)info.parsePrivateKey();
     59 
     60         this.x = derX.getValue();
     61         this.dsaSpec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
     62     }
     63 
     64     BCDSAPrivateKey(
     65         DSAPrivateKeyParameters params)
     66     {
     67         this.x = params.getX();
     68         this.dsaSpec = new DSAParameterSpec(params.getParameters().getP(), params.getParameters().getQ(), params.getParameters().getG());
     69     }
     70 
     71     public String getAlgorithm()
     72     {
     73         return "DSA";
     74     }
     75 
     76     /**
     77      * return the encoding format we produce in getEncoded().
     78      *
     79      * @return the string "PKCS#8"
     80      */
     81     public String getFormat()
     82     {
     83         return "PKCS#8";
     84     }
     85 
     86     /**
     87      * Return a PKCS8 representation of the key. The sequence returned
     88      * represents a full PrivateKeyInfo object.
     89      *
     90      * @return a PKCS8 representation of the key.
     91      */
     92     public byte[] getEncoded()
     93     {
     94         return KeyUtil.getEncodedPrivateKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, new DSAParameter(dsaSpec.getP(), dsaSpec.getQ(), dsaSpec.getG()).toASN1Primitive()), new ASN1Integer(getX()));
     95     }
     96 
     97     public DSAParams getParams()
     98     {
     99         return dsaSpec;
    100     }
    101 
    102     public BigInteger getX()
    103     {
    104         return x;
    105     }
    106 
    107     public boolean equals(
    108         Object o)
    109     {
    110         if (!(o instanceof DSAPrivateKey))
    111         {
    112             return false;
    113         }
    114 
    115         DSAPrivateKey other = (DSAPrivateKey)o;
    116 
    117         return this.getX().equals(other.getX())
    118             && this.getParams().getG().equals(other.getParams().getG())
    119             && this.getParams().getP().equals(other.getParams().getP())
    120             && this.getParams().getQ().equals(other.getParams().getQ());
    121     }
    122 
    123     public int hashCode()
    124     {
    125         return this.getX().hashCode() ^ this.getParams().getG().hashCode()
    126                 ^ this.getParams().getP().hashCode() ^ this.getParams().getQ().hashCode();
    127     }
    128 
    129     public void setBagAttribute(
    130         ASN1ObjectIdentifier oid,
    131         ASN1Encodable attribute)
    132     {
    133         attrCarrier.setBagAttribute(oid, attribute);
    134     }
    135 
    136     public ASN1Encodable getBagAttribute(
    137         ASN1ObjectIdentifier oid)
    138     {
    139         return attrCarrier.getBagAttribute(oid);
    140     }
    141 
    142     public Enumeration getBagAttributeKeys()
    143     {
    144         return attrCarrier.getBagAttributeKeys();
    145     }
    146 
    147     private void readObject(
    148         ObjectInputStream in)
    149         throws IOException, ClassNotFoundException
    150     {
    151         in.defaultReadObject();
    152 
    153         this.dsaSpec = new DSAParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject(), (BigInteger)in.readObject());
    154         this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
    155     }
    156 
    157     private void writeObject(
    158         ObjectOutputStream out)
    159         throws IOException
    160     {
    161         out.defaultWriteObject();
    162 
    163         out.writeObject(dsaSpec.getP());
    164         out.writeObject(dsaSpec.getQ());
    165         out.writeObject(dsaSpec.getG());
    166     }
    167 }
    168