Examples of sun.security.util.DerInputStream

sun.security.util.DerInputStream
A DER input stream, used for parsing ASN.1 DER-encoded data such as that found in X.509 certificates. DER is a subset of BER/1, which has the advantage that it allows only a single encoding of primitive data. (High level data such as dates still support many encodings.) That is, it uses the "Definite" Encoding Rules (DER) not the "Basic" ones (BER).
Note that, like BER/1, DER streams are streams of explicitly tagged data values. Accordingly, this programming interface does not expose any variant of the java.io.InputStream interface, since that kind of input stream holds untagged data values and using that I/O model could prevent correct parsing of the DER data.
At this time, this class supports only a subset of the types of DER data encodings which are defined. That subset is sufficient for parsing most X.509 certificates. @author David Brownell @author Amit Kapoor @author Hemma Prafullchandra

                    debug.println("X509CertSelector.match: "
                        + "no subject key ID extension");
                }
                return false;
            }
            DerInputStream in = new DerInputStream(extVal);
            byte[] certSubjectKeyID = in.getOctetString();
            if (certSubjectKeyID == null ||
                    !Arrays.equals(subjectKeyID, certSubjectKeyID)) {
                if (debug != null) {
                    debug.println("X509CertSelector.match: "
                        + "subject key IDs don't match");

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                    debug.println("X509CertSelector.match: "
                        + "no authority key ID extension");
                }
                return false;
            }
            DerInputStream in = new DerInputStream(extVal);
            byte[] certAuthKeyID = in.getOctetString();
            if (certAuthKeyID == null ||
                    !Arrays.equals(authorityKeyID, certAuthKeyID)) {
                if (debug != null) {
                    debug.println("X509CertSelector.match: "
                        + "authority key IDs don't match");

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        }
    }


    private static void checkPKCS8Encoding(byte[] encodedKey)
        throws IOException {
        DerInputStream in = new DerInputStream(encodedKey);
        DerValue[] values = in.getSequence(3);


        switch (values.length) {
        case 4:
            checkTag(values[3], DerValue.TAG_CONTEXT, "attributes");
        case 3:
            checkTag(values[0], DerValue.tag_Integer, "version");
            DerInputStream algid = values[1].toDerInputStream();
            algid.getOID();
            if (algid.available() != 0) {
                algid.getDerValue();
            }
            checkTag(values[2], DerValue.tag_OctetString, "privateKey");
            break;
        default:
            throw new IOException("invalid key encoding");

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     */


     public static ObjectIdentifier getOID(byte[] derOID)
         throws IOException
     {
         DerInputStream dis = new DerInputStream(derOID);
         ObjectIdentifier oid = dis.getOID();


         /* Note: getOID() method call generates an IOException
          *       if derOID contains any malformed data
          */
         return oid;

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                /* Extract DER encoding */
                derenc = X509CertificateChainHelper.extract(any);
            }


            DerInputStream din = new DerInputStream(derenc);


            /** 
             * Size specified for getSequence() is 1 and is just 
             * used as a guess by the method getSequence().
             */
            DerValue[] derval = din.getSequence(1);
            X509Certificate[] certchain = 
                        new X509CertImpl[derval.length];
            /**
             * X509Certificate does not have a constructor which can
             * be used to instantiate objects from DER encodings. So

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