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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
package org.bouncycastle.cert;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Set;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROutputStream;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.AttCertValidityPeriod;
import org.bouncycastle.asn1.x509.Attribute;
import org.bouncycastle.asn1.x509.AttributeCertificate;
import org.bouncycastle.asn1.x509.AttributeCertificateInfo;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.operator.ContentVerifierProvider;
/**
* Holding class for an X.509 AttributeCertificate structure.
*/
public class X509AttributeCertificateHolder
{
private static Attribute[] EMPTY_ARRAY = new Attribute[0];
private AttributeCertificate attrCert;
private Extensions extensions;
private static AttributeCertificate parseBytes(byte[] certEncoding)
throws IOException
{
try
{
return AttributeCertificate.getInstance(ASN1Primitive.fromByteArray(certEncoding));
}
catch (ClassCastException e)
{
throw new CertIOException("malformed data: " + e.getMessage(), e);
}
catch (IllegalArgumentException e)
{
throw new CertIOException("malformed data: " + e.getMessage(), e);
}
}
/**
* Create a X509AttributeCertificateHolder from the passed in bytes.
*
* @param certEncoding BER/DER encoding of the certificate.
* @throws IOException in the event of corrupted data, or an incorrect structure.
*/
public X509AttributeCertificateHolder(byte[] certEncoding)
throws IOException
{
this(parseBytes(certEncoding));
}
/**
* Create a X509AttributeCertificateHolder from the passed in ASN.1 structure.
*
* @param attrCert an ASN.1 AttributeCertificate structure.
*/
public X509AttributeCertificateHolder(AttributeCertificate attrCert)
{
this.attrCert = attrCert;
this.extensions = attrCert.getAcinfo().getExtensions();
}
/**
* Return the ASN.1 encoding of this holder's attribute certificate.
*
* @return a DER encoded byte array.
* @throws IOException if an encoding cannot be generated.
*/
public byte[] getEncoded()
throws IOException
{
return attrCert.getEncoded();
}
public int getVersion()
{
return attrCert.getAcinfo().getVersion().getValue().intValue() + 1;
}
/**
* Return the serial number of this attribute certificate.
*
* @return the serial number.
*/
public BigInteger getSerialNumber()
{
return attrCert.getAcinfo().getSerialNumber().getValue();
}
/**
* Return the holder details for this attribute certificate.
*
* @return this attribute certificate's holder structure.
*/
public AttributeCertificateHolder getHolder()
{
return new AttributeCertificateHolder((ASN1Sequence)attrCert.getAcinfo().getHolder().toASN1Primitive());
}
/**
* Return the issuer details for this attribute certificate.
*
* @return this attribute certificate's issuer structure,
*/
public AttributeCertificateIssuer getIssuer()
{
return new AttributeCertificateIssuer(attrCert.getAcinfo().getIssuer());
}
/**
* Return the date before which this attribute certificate is not valid.
*
* @return the start date for the attribute certificate's validity period.
*/
public Date getNotBefore()
{
return CertUtils.recoverDate(attrCert.getAcinfo().getAttrCertValidityPeriod().getNotBeforeTime());
}
/**
* Return the date after which this attribute certificate is not valid.
*
* @return the final date for the attribute certificate's validity period.
*/
public Date getNotAfter()
{
return CertUtils.recoverDate(attrCert.getAcinfo().getAttrCertValidityPeriod().getNotAfterTime());
}
/**
* Return the attributes, if any associated with this request.
*
* @return an array of Attribute, zero length if none present.
*/
public Attribute[] getAttributes()
{
ASN1Sequence seq = attrCert.getAcinfo().getAttributes();
Attribute[] attrs = new Attribute[seq.size()];
for (int i = 0; i != seq.size(); i++)
{
attrs[i] = Attribute.getInstance(seq.getObjectAt(i));
}
return attrs;
}
/**
* Return an array of attributes matching the passed in type OID.
*
* @param type the type of the attribute being looked for.
* @return an array of Attribute of the requested type, zero length if none present.
*/
public Attribute[] getAttributes(ASN1ObjectIdentifier type)
{
ASN1Sequence seq = attrCert.getAcinfo().getAttributes();
List list = new ArrayList();
for (int i = 0; i != seq.size(); i++)
{
Attribute attr = Attribute.getInstance(seq.getObjectAt(i));
if (attr.getAttrType().equals(type))
{
list.add(attr);
}
}
if (list.size() == 0)
{
return EMPTY_ARRAY;
}
return (Attribute[])list.toArray(new Attribute[list.size()]);
}
/**
* Return whether or not the holder's attribute certificate contains extensions.
*
* @return true if extension are present, false otherwise.
*/
public boolean hasExtensions()
{
return extensions != null;
}
/**
* Look up the extension associated with the passed in OID.
*
* @param oid the OID of the extension of interest.
*
* @return the extension if present, null otherwise.
*/
public Extension getExtension(ASN1ObjectIdentifier oid)
{
if (extensions != null)
{
return extensions.getExtension(oid);
}
return null;
}
/**
* Return the extensions block associated with this certificate if there is one.
*
* @return the extensions block, null otherwise.
*/
public Extensions getExtensions()
{
return extensions;
}
/**
* Returns a list of ASN1ObjectIdentifier objects representing the OIDs of the
* extensions contained in this holder's attribute certificate.
*
* @return a list of extension OIDs.
*/
public List getExtensionOIDs()
{
return CertUtils.getExtensionOIDs(extensions);
}
/**
* Returns a set of ASN1ObjectIdentifier objects representing the OIDs of the
* critical extensions contained in this holder's attribute certificate.
*
* @return a set of critical extension OIDs.
*/
public Set getCriticalExtensionOIDs()
{
return CertUtils.getCriticalExtensionOIDs(extensions);
}
/**
* Returns a set of ASN1ObjectIdentifier objects representing the OIDs of the
* non-critical extensions contained in this holder's attribute certificate.
*
* @return a set of non-critical extension OIDs.
*/
public Set getNonCriticalExtensionOIDs()
{
return CertUtils.getNonCriticalExtensionOIDs(extensions);
}
public boolean[] getIssuerUniqueID()
{
return CertUtils.bitStringToBoolean(attrCert.getAcinfo().getIssuerUniqueID());
}
/**
* Return the details of the signature algorithm used to create this attribute certificate.
*
* @return the AlgorithmIdentifier describing the signature algorithm used to create this attribute certificate.
*/
public AlgorithmIdentifier getSignatureAlgorithm()
{
return attrCert.getSignatureAlgorithm();
}
/**
* Return the bytes making up the signature associated with this attribute certificate.
*
* @return the attribute certificate signature bytes.
*/
public byte[] getSignature()
{
return attrCert.getSignatureValue().getBytes();
}
/**
* Return the underlying ASN.1 structure for the attribute certificate in this holder.
*
* @return a AttributeCertificate object.
*/
public AttributeCertificate toASN1Structure()
{
return attrCert;
}
/**
* Return whether or not this attribute certificate is valid on a particular date.
*
* @param date the date of interest.
* @return true if the attribute certificate is valid, false otherwise.
*/
public boolean isValidOn(Date date)
{
AttCertValidityPeriod certValidityPeriod = attrCert.getAcinfo().getAttrCertValidityPeriod();
return !date.before(CertUtils.recoverDate(certValidityPeriod.getNotBeforeTime())) && !date.after(CertUtils.recoverDate(certValidityPeriod.getNotAfterTime()));
}
/**
* Validate the signature on the attribute certificate in this holder.
*
* @param verifierProvider a ContentVerifierProvider that can generate a verifier for the signature.
* @return true if the signature is valid, false otherwise.
* @throws CertException if the signature cannot be processed or is inappropriate.
*/
public boolean isSignatureValid(ContentVerifierProvider verifierProvider)
throws CertException
{
AttributeCertificateInfo acinfo = attrCert.getAcinfo();
if (!CertUtils.isAlgIdEqual(acinfo.getSignature(), attrCert.getSignatureAlgorithm()))
{
throw new CertException("signature invalid - algorithm identifier mismatch");
}
ContentVerifier verifier;
try
{
verifier = verifierProvider.get((acinfo.getSignature()));
OutputStream sOut = verifier.getOutputStream();
DEROutputStream dOut = new DEROutputStream(sOut);
dOut.writeObject(acinfo);
sOut.close();
}
catch (Exception e)
{
throw new CertException("unable to process signature: " + e.getMessage(), e);
}
return verifier.verify(attrCert.getSignatureValue().getBytes());
}
public boolean equals(
Object o)
{
if (o == this)
{
return true;
}
if (!(o instanceof X509AttributeCertificateHolder))
{
return false;
}
X509AttributeCertificateHolder other = (X509AttributeCertificateHolder)o;
return this.attrCert.equals(other.attrCert);
}
public int hashCode()
{
return this.attrCert.hashCode();
}
}
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