package org.bouncycastle.asn1.pkcs;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERInputStream;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
public class PrivateKeyInfo
implements PKCSObjectIdentifiers, DEREncodable
{
private DERObject privKey;
private AlgorithmIdentifier algId;
public PrivateKeyInfo(
AlgorithmIdentifier algId,
DERObject privateKey)
{
this.privKey = privateKey;
this.algId = algId;
}
public PrivateKeyInfo(
ASN1Sequence seq)
{
Enumeration e = seq.getObjects();
BigInteger version = ((DERInteger)e.nextElement()).getValue();
if (version.intValue() != 0)
{
throw new IllegalArgumentException("wrong version for private key info");
}
algId = new AlgorithmIdentifier((ASN1Sequence)e.nextElement());
try
{
ByteArrayInputStream bIn = new ByteArrayInputStream(((ASN1OctetString)e.nextElement()).getOctets());
DERInputStream dIn = new DERInputStream(bIn);
privKey = dIn.readObject();
}
catch (IOException ex)
{
throw new IllegalArgumentException("Error recoverying private key from sequence");
}
}
public AlgorithmIdentifier getAlgorithmId()
{
return algId;
}
public DERObject getPrivateKey()
{
return privKey;
}
/**
* write out an RSA private key with it's asscociated information
* as described in PKCS8.
* <pre>
* PrivateKeyInfo ::= SEQUENCE {
* version Version,
* privateKeyAlgorithm AlgorithmIdentifier {{PrivateKeyAlgorithms}},
* privateKey PrivateKey,
* attributes [0] IMPLICIT Attributes OPTIONAL
* }
* Version ::= INTEGER {v1(0)} (v1,...)
*
* PrivateKey ::= OCTET STRING
*
* Attributes ::= SET OF Attribute
* </pre>
*/
public DERObject getDERObject()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new DERInteger(0));
v.add(algId);
v.add(new DEROctetString(privKey));
return new DERSequence(v);
}
}