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


        int oidLen  = (((0xFF & bytes[pos++]) << 8) |
                       (0xFF & bytes[pos++]));
        ObjectIdentifier temp = null;
        try {
            DerInputStream din = new DerInputStream(bytes, pos,
                                                    oidLen);
            temp = new ObjectIdentifier(din);
        } catch (IOException e) {
            throw new GSSExceptionImpl(GSSException.BAD_NAME,
                       "Exported name Object identifier is corrupted!");

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            Debug.toHexString(x) + "\n";
    }


    protected void parseKeyBits() throws InvalidKeyException {
        try {
            DerInputStream in = new DerInputStream(key);
            x = in.getBigInteger();
        } catch (IOException e) {
            InvalidKeyException ike = new InvalidKeyException(e.getMessage());
            ike.initCause(e);
            throw ike;
        }

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        // All the elements in issuingDistributionPoint are optional
        if ((val.data == null) || (val.data.available() == 0)) {
            return;
        }


        DerInputStream in = val.data;
        while (in != null && in.available() != 0) {
            DerValue opt = in.getDerValue();


            if (opt.isContextSpecific(TAG_DISTRIBUTION_POINT) &&
                opt.isConstructed()) {
                distributionPoint =
                    new DistributionPointName(opt.data.getDerValue());

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        BigInteger r = null;
        BigInteger s = null;
        // first decode the signature.
        try {
            DerInputStream in = new DerInputStream(signature, offset, length);
            DerValue[] values = in.getSequence(2);


            r = values[0].getBigInteger();
            s = values[1].getBigInteger();


        } catch (IOException e) {

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    public static void createPath(String[] certs) throws Exception {


        X509Certificate anchorCert = getCertFromFile(certs[0]);
        byte [] nameConstraints = anchorCert.getExtensionValue("2.5.29.30");
        if (nameConstraints != null) {
            DerInputStream in = new DerInputStream(nameConstraints);
            nameConstraints = in.getOctetString();
        }
        TrustAnchor anchor = new TrustAnchor(anchorCert, nameConstraints);
        List list = new ArrayList();
        for (int i = 1; i < certs.length; i++) {
            list.add(0, getCertFromFile(certs[i]));

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                                                   (byte)0x5d, (byte)0xc0 };


    public static void main(String args[]) throws Exception {
        byte[] ba0, ba1;
        try {
            DerInputStream derin = new DerInputStream(DER_BITSTRING_PAD6);
            ba1 = derin.getBitString();
        } catch( IOException e ) {
            e.printStackTrace();
            throw new Exception("Unable to parse BitString with 6 padding bits");
        }


        try {
            DerInputStream derin = new DerInputStream(DER_BITSTRING_NOPAD);
            ba0 = derin.getBitString();
        } catch( IOException e ) {
            e.printStackTrace();
            throw new Exception("Unable to parse BitString with no padding");
        }

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  // correct zero integer
  private final static byte[] INT0 = { 2, 1, 0 };


  public static void main(String args[]) throws Exception {
    try {
      DerInputStream derin = new DerInputStream(INT_LEN0);
      BigInteger bi = derin.getBigInteger();
      throw new Exception("Succeeded parsing invalid zero length value");
    } catch( IOException e ) {
      System.out.println("OK, zero length value rejected.");
    }


    DerInputStream derin = new DerInputStream(INT0);
    BigInteger bi = derin.getBigInteger();
    if( bi.equals(BigInteger.ZERO) == false ) {
      throw new Exception("Failed to parse Integer 0");
    }


  }

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  private final static byte[] GEN_FRACT3_COMMA_PLUS1 =
    {0x18, 0x17, 0x32, 0x30, 0x30, 0x31, 0x30, 0x38, 0x31, 0x30, 0x31, 0x38, 0x34, 0x33, 0x35, 0x31, 0x2c, 0x37, 0x36, 0x35, 0x2b, 0x30, 0x31, 0x30, 0x30};




  private static Date decodeUTC(byte[] b) throws IOException {
    DerInputStream derin = new DerInputStream(b);
    return derin.getUTCTime();
  }

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    DerInputStream derin = new DerInputStream(b);
    return derin.getUTCTime();
  }


  private static Date decodeGeneralized(byte[] b) throws IOException {
    DerInputStream derin = new DerInputStream(b);
    return derin.getGeneralizedTime();
  }

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        throws IOException, ParsingException
    {
        DerValue[] macData = derin.getSequence(2);


        // Parse the digest info
        DerInputStream digestIn = new DerInputStream(macData[0].toByteArray());
        DerValue[] digestInfo = digestIn.getSequence(2);


        // Parse the DigestAlgorithmIdentifier.
        AlgorithmId digestAlgorithmId = AlgorithmId.parse(digestInfo[0]);
        this.digestAlgorithmName = digestAlgorithmId.getName();
        this.digestAlgorithmParams = digestAlgorithmId.getParameters();

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