/*
* Adito
*
* Copyright (C) 2003-2006 3SP LTD. All Rights Reserved
*
* 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; either version 2 of
* the License, or (at your option) any later version.
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package com.maverick.crypto.asn1.x509;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Enumeration;
import com.maverick.crypto.asn1.ASN1EncodableVector;
import com.maverick.crypto.asn1.ASN1Sequence;
import com.maverick.crypto.asn1.ASN1TaggedObject;
import com.maverick.crypto.asn1.DERBitString;
import com.maverick.crypto.asn1.DEREncodable;
import com.maverick.crypto.asn1.DERInputStream;
import com.maverick.crypto.asn1.DERObject;
import com.maverick.crypto.asn1.DERSequence;
/**
* The object that contains the public key stored in a certficate.
* <p>
* The getEncoded() method in the public keys in the JCE produces a DER
* encoded one of these.
*/
public class SubjectPublicKeyInfo
implements DEREncodable
{
private AlgorithmIdentifier algId;
private DERBitString keyData;
public static SubjectPublicKeyInfo getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
return getInstance(ASN1Sequence.getInstance(obj, explicit));
}
public static SubjectPublicKeyInfo getInstance(
Object obj)
{
if (obj instanceof SubjectPublicKeyInfo)
{
return (SubjectPublicKeyInfo)obj;
}
else if (obj instanceof ASN1Sequence)
{
return new SubjectPublicKeyInfo((ASN1Sequence)obj);
}
throw new IllegalArgumentException("unknown object in factory");
}
public SubjectPublicKeyInfo(
AlgorithmIdentifier algId,
DEREncodable publicKey)
{
this.keyData = new DERBitString(publicKey);
this.algId = algId;
}
public SubjectPublicKeyInfo(
AlgorithmIdentifier algId,
byte[] publicKey)
{
this.keyData = new DERBitString(publicKey);
this.algId = algId;
}
public SubjectPublicKeyInfo(
ASN1Sequence seq)
{
Enumeration e = seq.getObjects();
this.algId = AlgorithmIdentifier.getInstance(e.nextElement());
this.keyData = (DERBitString)e.nextElement();
}
public AlgorithmIdentifier getAlgorithmId()
{
return algId;
}
/**
* for when the public key is an encoded object - if the bitstring
* can't be decoded this routine throws an IOException.
*
* @exception IOException - if the bit string doesn't represent a DER
* encoded object.
*/
public DERObject getPublicKey()
throws IOException
{
ByteArrayInputStream bIn = new ByteArrayInputStream(keyData.getBytes());
DERInputStream dIn = new DERInputStream(bIn);
return dIn.readObject();
}
/**
* for when the public key is raw bits...
*/
public DERBitString getPublicKeyData()
{
return keyData;
}
/**
* Produce an object suitable for an ASN1OutputStream.
* <pre>
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* publicKey BIT STRING }
* </pre>
*/
public DERObject getDERObject()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(algId);
v.add(keyData);
return new DERSequence(v);
}
}