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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.asn1.x509;

import java.math.BigInteger;
import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.util.encoders.Hex;

/**
 * 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
 * 
* */ public class AuthorityKeyIdentifier extends ASN1Object { ASN1OctetString keyidentifier=null; GeneralNames certissuer=null; ASN1Integer certserno=null; public static AuthorityKeyIdentifier getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(ASN1Sequence.getInstance(obj, explicit)); } public static AuthorityKeyIdentifier getInstance( Object obj) { if (obj instanceof AuthorityKeyIdentifier) { return (AuthorityKeyIdentifier)obj; } if (obj != null) { return new AuthorityKeyIdentifier(ASN1Sequence.getInstance(obj)); } return null; } public static AuthorityKeyIdentifier fromExtensions(Extensions extensions) { return AuthorityKeyIdentifier.getInstance(extensions.getExtensionParsedValue(Extension.authorityKeyIdentifier)); } protected AuthorityKeyIdentifier( ASN1Sequence seq) { Enumeration e = seq.getObjects(); while (e.hasMoreElements()) { ASN1TaggedObject o = DERTaggedObject.getInstance(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 = ASN1Integer.getInstance(o, false); break; default: throw new IllegalArgumentException("illegal tag"); } } } /** * * 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 ASN1InputStream(
     *       publicKey.getEncoded()).readObject());
     *   AuthorityKeyIdentifier aki = new AuthorityKeyIdentifier(apki);
     * 
* @deprecated create the extension using org.bouncycastle.cert.X509ExtensionUtils **/ public AuthorityKeyIdentifier( SubjectPublicKeyInfo spki) { 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); } /** * create an AuthorityKeyIdentifier with the GeneralNames tag and * the serial number provided as well. * @deprecated create the extension using org.bouncycastle.cert.X509ExtensionUtils */ public AuthorityKeyIdentifier( SubjectPublicKeyInfo spki, GeneralNames name, BigInteger serialNumber) { 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 = GeneralNames.getInstance(name.toASN1Primitive()); this.certserno = new ASN1Integer(serialNumber); } /** * create an AuthorityKeyIdentifier with the GeneralNames tag and * the serial number provided. */ public AuthorityKeyIdentifier( GeneralNames name, BigInteger serialNumber) { this((byte[])null, name, serialNumber); } /** * create an AuthorityKeyIdentifier with a precomputed key identifier */ public AuthorityKeyIdentifier( byte[] keyIdentifier) { this(keyIdentifier, null, null); } /** * create an AuthorityKeyIdentifier with a precomputed key identifier * and the GeneralNames tag and the serial number provided as well. */ public AuthorityKeyIdentifier( byte[] keyIdentifier, GeneralNames name, BigInteger serialNumber) { this.keyidentifier = (keyIdentifier != null) ? new DEROctetString(keyIdentifier) : null; this.certissuer = name; this.certserno = (serialNumber != null) ? new ASN1Integer(serialNumber) : null; } public byte[] getKeyIdentifier() { if (keyidentifier != null) { return keyidentifier.getOctets(); } return null; } public GeneralNames getAuthorityCertIssuer() { return certissuer; } public BigInteger getAuthorityCertSerialNumber() { if (certserno != null) { return certserno.getValue(); } return null; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(3); 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 String toString() { return ("AuthorityKeyIdentifier: KeyID(" + ((keyidentifier != null) ? Hex.toHexString(this.keyidentifier.getOctets()) : "null") + ")"); } }




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