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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. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.asn1.x509;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.x500.X500Name;

/**
 * an X509Certificate structure.
 * 
 *  Certificate ::= SEQUENCE {
 *      tbsCertificate          TBSCertificate,
 *      signatureAlgorithm      AlgorithmIdentifier,
 *      signature               BIT STRING
 *  }
 * 
*/ public class Certificate extends ASN1Object { ASN1Sequence seq; TBSCertificate tbsCert; AlgorithmIdentifier sigAlgId; DERBitString sig; public static Certificate getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(ASN1Sequence.getInstance(obj, explicit)); } public static Certificate getInstance( Object obj) { if (obj instanceof Certificate) { return (Certificate)obj; } else if (obj != null) { return new Certificate(ASN1Sequence.getInstance(obj)); } return null; } private Certificate( ASN1Sequence seq) { this.seq = seq; // // correct x509 certficate // if (seq.size() == 3) { tbsCert = TBSCertificate.getInstance(seq.getObjectAt(0)); sigAlgId = AlgorithmIdentifier.getInstance(seq.getObjectAt(1)); sig = DERBitString.getInstance(seq.getObjectAt(2)); } else { throw new IllegalArgumentException("sequence wrong size for a certificate"); } } public TBSCertificate getTBSCertificate() { return tbsCert; } public ASN1Integer getVersion() { return tbsCert.getVersion(); } public int getVersionNumber() { return tbsCert.getVersionNumber(); } public ASN1Integer getSerialNumber() { return tbsCert.getSerialNumber(); } public X500Name getIssuer() { return tbsCert.getIssuer(); } public Time getStartDate() { return tbsCert.getStartDate(); } public Time getEndDate() { return tbsCert.getEndDate(); } public X500Name getSubject() { return tbsCert.getSubject(); } public SubjectPublicKeyInfo getSubjectPublicKeyInfo() { return tbsCert.getSubjectPublicKeyInfo(); } public AlgorithmIdentifier getSignatureAlgorithm() { return sigAlgId; } public DERBitString getSignature() { return sig; } public ASN1Primitive toASN1Primitive() { return seq; } }




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