package org.bouncycastle.asn1.x509;

import java.io.IOException;
import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;

The object that contains the public key stored in a certficate.

The getEncoded() method in the public keys in the JCE produces a DER encoded one of these.

/** * 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 extends ASN1Encodable { 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 != null) { return new SubjectPublicKeyInfo(ASN1Sequence.getInstance(obj)); } return null; } 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) { if (seq.size() != 2) { throw new IllegalArgumentException("Bad sequence size: " + seq.size()); } Enumeration e = seq.getObjects(); this.algId = AlgorithmIdentifier.getInstance(e.nextElement()); this.keyData = DERBitString.getInstance(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.
Throws:
  • IOException – - if the bit string doesn't represent a DER encoded object.
/** * 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 { ASN1InputStream aIn = new ASN1InputStream(keyData.getBytes()); return aIn.readObject(); }
for when the public key is raw bits...
/** * for when the public key is raw bits... */
public DERBitString getPublicKeyData() { return keyData; }
Produce an object suitable for an ASN1OutputStream.
SubjectPublicKeyInfo ::= SEQUENCE {
                         algorithm AlgorithmIdentifier,
                         publicKey BIT STRING }
/** * Produce an object suitable for an ASN1OutputStream. * <pre> * SubjectPublicKeyInfo ::= SEQUENCE { * algorithm AlgorithmIdentifier, * publicKey BIT STRING } * </pre> */
public DERObject toASN1Object() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(algId); v.add(keyData); return new DERSequence(v); } }