Example usage for org.bouncycastle.asn1.x509 Extension cRLDistributionPoints

Introduction

In this page you can find the example usage for org.bouncycastle.asn1.x509 Extension cRLDistributionPoints.

Prototype

ASN1ObjectIdentifier cRLDistributionPoints

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Document

CRL Distribution Points

Usage

From source file:tools.pki.gbay.crypto.keys.validation.CertificateRevocationList.java

License:Apache License

/**
 * Extracts all CRL distribution point URLs from the
 * "CRL Distribution Point" extension in a X.509 certificate. If CRL
 * distribution point extension is unavailable, returns an empty list.
 * @param cert //from   w  ww  .  j  a  v  a 2  s .  c  o m
 * @return List of all CRL DPs
 * @throws CertificateParsingException 
 * @throws IOException 
 */
public static List<String> getCrlDistributionPoints(X509Certificate cert)
        throws CertificateParsingException, IOException {
    byte[] crldpExt = cert.getExtensionValue(Extension.cRLDistributionPoints.getId());
    if (crldpExt == null) {
        return new ArrayList<String>();
    }
    ASN1InputStream oAsnInStream = new ASN1InputStream(new ByteArrayInputStream(crldpExt));
    ASN1Primitive derObjCrlDP = oAsnInStream.readObject();
    DEROctetString dosCrlDP = (DEROctetString) derObjCrlDP;
    byte[] crldpExtOctets = dosCrlDP.getOctets();
    ASN1InputStream oAsnInStream2 = new ASN1InputStream(new ByteArrayInputStream(crldpExtOctets));
    ASN1Primitive derObj2 = oAsnInStream2.readObject();
    CRLDistPoint distPoint = CRLDistPoint.getInstance(derObj2);
    List<String> crlUrls = new ArrayList<String>();
    for (DistributionPoint dp : distPoint.getDistributionPoints()) {
        DistributionPointName dpn = dp.getDistributionPoint();
        // Look for URIs in fullName
        if (dpn != null && dpn.getType() == DistributionPointName.FULL_NAME) {
            GeneralName[] genNames = GeneralNames.getInstance(dpn.getName()).getNames();
            // Look for an URI
            for (int j = 0; j < genNames.length; j++) {
                if (genNames[j].getTagNo() == GeneralName.uniformResourceIdentifier) {
                    String url = DERIA5String.getInstance(genNames[j].getName()).getString();
                    log.debug("URL : " + url);
                    crlUrls.add(url);
                }
            }
        }
    }
    oAsnInStream.close();
    oAsnInStream2.close();
    return crlUrls;
}