nl.open.jwtdependency.org.bouncycastle.crypto.util.DERMacData Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of java-jwt-nodependencies Show documentation

This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).

The newest version!

package org.bouncycastle.crypto.util;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Strings;

/**
 * Builder and holder class for preparing SP 800-56A compliant MacData. Elements in the data are encoded
 * as DER objects with empty octet strings used to represent nulls in compulsory fields.
 */
public final class DERMacData
{
    public enum Type
    {
        UNILATERALU("KC_1_U"),
        UNILATERALV("KC_1_V"),
        BILATERALU("KC_2_U"),
        BILATERALV("KC_2_V");

        private final String enc;

        Type(String enc)
        {
            this.enc = enc;
        }

        public byte[] getHeader()
        {
            return Strings.toByteArray(enc);
        }
    }

    /**
     * Builder to create OtherInfo
     */
    public static final class Builder
    {
        private final Type type;

        private ASN1OctetString idU;
        private ASN1OctetString idV;
        private ASN1OctetString ephemDataU;
        private ASN1OctetString ephemDataV;
        private byte[] text;

        /**
         * Create a basic builder with just the compulsory fields.
         *
         * @param type the MAC header
         * @param idU  sender party ID.
         * @param idV  receiver party ID.
         * @param ephemDataU ephemeral data from sender.
         * @param ephemDataV ephemeral data from receiver.
         */
        public Builder(Type type, byte[] idU, byte[] idV, byte[] ephemDataU, byte[] ephemDataV)
        {
            this.type = type;
            this.idU = DerUtil.getOctetString(idU);
            this.idV = DerUtil.getOctetString(idV);
            this.ephemDataU = DerUtil.getOctetString(ephemDataU);
            this.ephemDataV = DerUtil.getOctetString(ephemDataV);
        }

        /**
         * Add optional text.
         *
         * @param text optional agreed text to add to the MAC.
         * @return the current builder instance.
         */
        public Builder withText(byte[] text)
        {
            this.text = DerUtil.toByteArray(new DERTaggedObject(false, 0, DerUtil.getOctetString(text)));

            return this;
        }

        public DERMacData build()
        {
            switch (type)
            {
            case UNILATERALU:
            case BILATERALU:
                return new DERMacData(concatenate(type.getHeader(),
                                DerUtil.toByteArray(idU), DerUtil.toByteArray(idV),
                                DerUtil.toByteArray(ephemDataU), DerUtil.toByteArray(ephemDataV), text));
            case UNILATERALV:
            case BILATERALV:
                return new DERMacData(concatenate(type.getHeader(),
                                DerUtil.toByteArray(idV), DerUtil.toByteArray(idU),
                                DerUtil.toByteArray(ephemDataV), DerUtil.toByteArray(ephemDataU), text));
            }

            throw new IllegalStateException("Unknown type encountered in build");   // should never happen
        }

        private byte[] concatenate(byte[] header, byte[] id1, byte[] id2, byte[] ed1, byte[] ed2, byte[] text)
        {
            return Arrays.concatenate(Arrays.concatenate(header, id1, id2), Arrays.concatenate(ed1, ed2, text));
        }
    }

    private final byte[] macData;

    private DERMacData(byte[] macData)
    {
        this.macData = macData;
    }

    public byte[] getMacData()
    {
        return Arrays.clone(macData);
    }
}