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The BSD License Copyright (c) 2010-2012 RIPE NCC All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of the RIPE NCC nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 package net.ripe.rpki.commons.crypto.util;
 public final class Asn1Util {
     private Asn1Util() {
         // Utility classes should not have a public or default constructor.
     public static byte[] encode(ASN1Encodable value) {
         try {
             ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
             DEROutputStream derOutputStream = new DEROutputStream(byteArrayOutputStream);
             return byteArrayOutputStream.toByteArray();
         } catch (IOException e) {
             throw new Asn1UtilException("IO exception while encoding resource extension"e);
     public static DERBitString resourceToBitString(UniqueIpResource resourceint bitCount) {
         int resourceTypeByteSize = resource.getType().getBitSize() / .;
         byte[] value = resource.getValue().toByteArray();
         byte[] padded;
         if (value.length > resourceTypeByteSize) {
             // Skip extra sign byte added by BigInteger.
             padded = Arrays.copyOfRange(value, 1, value.length);
         } else if (value.length < resourceTypeByteSize) {
             // Pad with leading zero bytes (e.g.
             padded = new byte[resourceTypeByteSize];
             System.arraycopy(value, 0, paddedresourceTypeByteSize - value.lengthvalue.length);
         } else {
             padded = value;
         assert padded.length == resourceTypeByteSize"incorrect padded length";
         int byteCount = (bitCount + . - 1) / .;
         int unusedBits = . - 1 - ((bitCount + . - 1) % .);
         return new DERBitString(ArrayUtils.subarray(padded, 0, byteCount), unusedBits);

Decodes the byte array extension using the org.bouncycastle.asn1.ASN1InputStream.
     public static ASN1Primitive decode(byte[] extension) {
         try {
             ASN1InputStream is = new ASN1InputStream(extension);
             return is.readObject();
        } catch (IOException e) {
            throw new Asn1UtilException("IO exception while decoding resource extension"e);

Checks if value is an instance of the expectedClass.

java.lang.IllegalArgumentException the instance is null or not an instance of the expected class.
    public static <T extends ASN1Encodable> T expect(ASN1Encodable valueClass<? extends T> expectedClass) {
        Validate.notNull(valueexpectedClass.getSimpleName() + " expected, got null");
        Validate.isTrue(expectedClass.isInstance(value), expectedClass.getSimpleName() + " expected, got " + value.getClass().getSimpleName()
                + " with value: " + value);
        return expectedClass.cast(value);

net.ripe.ipresource.IpAddress used as a prefix.
    public static IpRange parseIpAddressAsPrefix(IpResourceType typeASN1Encodable der) {
        DERBitString derBitString = (DERBitStringder;
        IpAddress ipAddress = parseIpAddress(typederBitStringfalse);
        int padBits = derBitString.getPadBits();
        return IpRange.prefix(ipAddressderBitString.getBytes().length * . - padBits);

IPAddress ::= BIT STRING
    public static IpAddress parseIpAddress(IpResourceType typeASN1Encodable derboolean padWithOnes) {
        DERBitString derBitString = (DERBitStringder;
        byte[] bytes = derBitString.getBytes();
        BigInteger value = new BigInteger(1, bytes);
        int usedBits = bytes.length * .;
        int neededBits = type.getBitSize();
        int padBits = derBitString.getPadBits();
        if (padBits > 0) {
            byte lastByte = bytes[bytes.length - 1];
            byte mask = (byte) ((1 << padBits) - 1);
            Validate.isTrue((lastByte & mask) == 0, "pad bits not zero");
        BigInteger upperBits = value.shiftLeft(neededBits - usedBits);
        BigInteger lowerBits = .;
        if (padWithOnes) {
            lowerBits = ..shiftLeft(neededBits - usedBits + padBits).subtract(.);
        return (IpAddresstype.fromBigInteger(upperBits.or(lowerBits));

    public static Asn parseAsId(ASN1Encodable der) {
        return new Asn(expect(derASN1Integer.class).getValue());

IPAddress ::= BIT STRING
    public static DERBitString encodeIpAddress(IpRange prefix) {
        Validate.isTrue(prefix.isLegalPrefix(), "not a legal prefix: " + prefix);
        return resourceToBitString(prefix.getStart(), prefix.getPrefixLength());
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