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AuthorityKeyIdentifier.javaAPI DocAzureus 3.0.3.44662Tue Jun 08 05:12:56 BST 2004org.bouncycastle.asn1.x509

AuthorityKeyIdentifier

public class AuthorityKeyIdentifier extends Object implements DEREncodable, DERTags
The AuthorityKeyIdentifier object. 
id-ce-authorityKeyIdentifier OBJECT IDENTIFIER ::= { id-ce 35 }

AuthorityKeyIdentifier ::= SEQUENCE {
keyIdentifier [0] IMPLICIT KeyIdentifier OPTIONAL,
authorityCertIssuer [1] IMPLICIT GeneralNames OPTIONAL,
authorityCertSerialNumber [2] IMPLICIT CertificateSerialNumber OPTIONAL }

KeyIdentifier ::= OCTET STRING

Fields Summary
ASN1OctetString
keyidentifier
GeneralNames
certissuer
DERInteger
certserno
Constructors Summary
public AuthorityKeyIdentifier(ASN1Sequence seq)

        Enumeration     e = seq.getObjects();

        while (e.hasMoreElements())
        {
            DERTaggedObject o = (DERTaggedObject)e.nextElement();

            switch (o.getTagNo())
            {
            case 0:
                this.keyidentifier = ASN1OctetString.getInstance(o, false);
                break;
            case 1:
                this.certissuer = GeneralNames.getInstance(o, false);
                break;
            case 2:
                this.certserno = DERInteger.getInstance(o, false);
                break;
            default:
                throw new IllegalArgumentException("illegal tag");
            }
        }
public AuthorityKeyIdentifier(SubjectPublicKeyInfo spki)
Calulates the keyidentifier using a SHA1 hash over the BIT STRING from SubjectPublicKeyInfo as defined in RFC2459. Example of making a AuthorityKeyIdentifier: 
SubjectPublicKeyInfo apki = new SubjectPublicKeyInfo((ASN1Sequence)new DERInputStream(
new ByteArrayInputStream(publicKey.getEncoded())).readObject());
AuthorityKeyIdentifier aki = new AuthorityKeyIdentifier(apki);


        Digest  digest = new SHA1Digest();
        byte[]  resBuf = new byte[digest.getDigestSize()];

        byte[] bytes = spki.getPublicKeyData().getBytes();
        digest.update(bytes, 0, bytes.length);
        digest.doFinal(resBuf, 0);
        this.keyidentifier = new DEROctetString(resBuf);
public AuthorityKeyIdentifier(SubjectPublicKeyInfo spki, GeneralNames name, BigInteger serialNumber)
create an AuthorityKeyIdentifier with the GeneralNames tag and the serial number provided as well.

        Digest  digest = new SHA1Digest();
        byte[]  resBuf = new byte[digest.getDigestSize()];

        byte[] bytes = spki.getPublicKeyData().getBytes();
        digest.update(bytes, 0, bytes.length);
        digest.doFinal(resBuf, 0);

        this.keyidentifier = new DEROctetString(resBuf);
        this.certissuer = name;
        this.certserno = new DERInteger(serialNumber);
Methods Summary
public DERObjectgetDERObject()
Produce an object suitable for an ASN1OutputStream.

        ASN1EncodableVector  v = new ASN1EncodableVector();

        if (keyidentifier != null)
        {
            v.add(new DERTaggedObject(false, 0, keyidentifier));
        }

        if (certissuer != null)
        {
            v.add(new DERTaggedObject(false, 1, certissuer));
        }

        if (certserno != null)
        {
            v.add(new DERTaggedObject(false, 2, certserno));
        }


        return new DERSequence(v);
public static org.bouncycastle.asn1.x509.AuthorityKeyIdentifiergetInstance(ASN1TaggedObject obj, boolean explicit)


       
         
                  
    
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
public static org.bouncycastle.asn1.x509.AuthorityKeyIdentifiergetInstance(java.lang.Object obj)

        if (obj instanceof AuthorityKeyIdentifier)
        {
            return (AuthorityKeyIdentifier)obj;
        }
        else if (obj instanceof ASN1Sequence)
        {
            return new AuthorityKeyIdentifier((ASN1Sequence)obj);
        }

        throw new IllegalArgumentException("unknown object in factory");
public byte[]getKeyIdentifier()

        if (keyidentifier != null)
        {
            return keyidentifier.getOctets();
        }

        return null;
public java.lang.StringtoString()

        return ("AuthorityKeyIdentifier: KeyID(" + this.keyidentifier.getOctets() + ")");