1package org.bouncycastle.jcajce.provider.asymmetric.dsa;
2
3import java.io.IOException;
4import java.io.ObjectInputStream;
5import java.io.ObjectOutputStream;
6import java.math.BigInteger;
7import java.security.interfaces.DSAParams;
8import java.security.interfaces.DSAPrivateKey;
9import java.security.spec.DSAParameterSpec;
10import java.security.spec.DSAPrivateKeySpec;
11import java.util.Enumeration;
12
13import org.bouncycastle.asn1.ASN1Encodable;
14import org.bouncycastle.asn1.ASN1Integer;
15import org.bouncycastle.asn1.ASN1ObjectIdentifier;
16import org.bouncycastle.asn1.DERObjectIdentifier;
17import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
18import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
19import org.bouncycastle.asn1.x509.DSAParameter;
20import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
21import org.bouncycastle.crypto.params.DSAPrivateKeyParameters;
22import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
23import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
24import org.bouncycastle.jce.interfaces.PKCS12BagAttributeCarrier;
25
26public class BCDSAPrivateKey
27    implements DSAPrivateKey, PKCS12BagAttributeCarrier
28{
29    private static final long serialVersionUID = -4677259546958385734L;
30
31    private BigInteger          x;
32    private transient DSAParams dsaSpec;
33
34    private transient PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl();
35
36    protected BCDSAPrivateKey()
37    {
38    }
39
40    BCDSAPrivateKey(
41        DSAPrivateKey key)
42    {
43        this.x = key.getX();
44        this.dsaSpec = key.getParams();
45    }
46
47    BCDSAPrivateKey(
48        DSAPrivateKeySpec spec)
49    {
50        this.x = spec.getX();
51        this.dsaSpec = new DSAParameterSpec(spec.getP(), spec.getQ(), spec.getG());
52    }
53
54    public BCDSAPrivateKey(
55        PrivateKeyInfo info)
56        throws IOException
57    {
58        DSAParameter    params = DSAParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters());
59        ASN1Integer      derX = (ASN1Integer)info.parsePrivateKey();
60
61        this.x = derX.getValue();
62        this.dsaSpec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
63    }
64
65    BCDSAPrivateKey(
66        DSAPrivateKeyParameters params)
67    {
68        this.x = params.getX();
69        this.dsaSpec = new DSAParameterSpec(params.getParameters().getP(), params.getParameters().getQ(), params.getParameters().getG());
70    }
71
72    public String getAlgorithm()
73    {
74        return "DSA";
75    }
76
77    /**
78     * return the encoding format we produce in getEncoded().
79     *
80     * @return the string "PKCS#8"
81     */
82    public String getFormat()
83    {
84        return "PKCS#8";
85    }
86
87    /**
88     * Return a PKCS8 representation of the key. The sequence returned
89     * represents a full PrivateKeyInfo object.
90     *
91     * @return a PKCS8 representation of the key.
92     */
93    public byte[] getEncoded()
94    {
95        return KeyUtil.getEncodedPrivateKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, new DSAParameter(dsaSpec.getP(), dsaSpec.getQ(), dsaSpec.getG()).toASN1Primitive()), new ASN1Integer(getX()));
96    }
97
98    public DSAParams getParams()
99    {
100        return dsaSpec;
101    }
102
103    public BigInteger getX()
104    {
105        return x;
106    }
107
108    public boolean equals(
109        Object o)
110    {
111        if (!(o instanceof DSAPrivateKey))
112        {
113            return false;
114        }
115
116        DSAPrivateKey other = (DSAPrivateKey)o;
117
118        return this.getX().equals(other.getX())
119            && this.getParams().getG().equals(other.getParams().getG())
120            && this.getParams().getP().equals(other.getParams().getP())
121            && this.getParams().getQ().equals(other.getParams().getQ());
122    }
123
124    public int hashCode()
125    {
126        return this.getX().hashCode() ^ this.getParams().getG().hashCode()
127                ^ this.getParams().getP().hashCode() ^ this.getParams().getQ().hashCode();
128    }
129
130    public void setBagAttribute(
131        ASN1ObjectIdentifier oid,
132        ASN1Encodable attribute)
133    {
134        attrCarrier.setBagAttribute(oid, attribute);
135    }
136
137    public ASN1Encodable getBagAttribute(
138        DERObjectIdentifier oid)
139    {
140        return attrCarrier.getBagAttribute(oid);
141    }
142
143    public Enumeration getBagAttributeKeys()
144    {
145        return attrCarrier.getBagAttributeKeys();
146    }
147
148    private void readObject(
149        ObjectInputStream in)
150        throws IOException, ClassNotFoundException
151    {
152        in.defaultReadObject();
153
154        this.dsaSpec = new DSAParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject(), (BigInteger)in.readObject());
155        this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
156    }
157
158    private void writeObject(
159        ObjectOutputStream out)
160        throws IOException
161    {
162        out.defaultWriteObject();
163
164        out.writeObject(dsaSpec.getP());
165        out.writeObject(dsaSpec.getQ());
166        out.writeObject(dsaSpec.getG());
167    }
168}
169