nl.open.jwtdependency.org.bouncycastle.crypto.engines.CramerShoupCiphertext 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.engines;

import java.math.BigInteger;

import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Pack;

/**
 * Class, holding Cramer Shoup ciphertexts (u1, u2, e, v)
 */
public class CramerShoupCiphertext
{
    BigInteger u1, u2, e, v;

    public CramerShoupCiphertext()
    {
    }

    public CramerShoupCiphertext(BigInteger u1, BigInteger u2, BigInteger e, BigInteger v)
    {
        this.u1 = u1;
        this.u2 = u2;
        this.e = e;
        this.v = v;
    }

    public CramerShoupCiphertext(byte[] c)
    {
        int off = 0, s;
        byte[] tmp;

        s = Pack.bigEndianToInt(c, off);
        off += 4;
        tmp = Arrays.copyOfRange(c, off, off + s);
        off += s;
        u1 = new BigInteger(tmp);

        s = Pack.bigEndianToInt(c, off);
        off += 4;
        tmp = Arrays.copyOfRange(c, off, off + s);
        off += s;
        u2 = new BigInteger(tmp);

        s = Pack.bigEndianToInt(c, off);
        off += 4;
        tmp = Arrays.copyOfRange(c, off, off + s);
        off += s;
        e = new BigInteger(tmp);

        s = Pack.bigEndianToInt(c, off);
        off += 4;
        tmp = Arrays.copyOfRange(c, off, off + s);
        off += s;
        v = new BigInteger(tmp);
    }

    public BigInteger getU1()
    {
        return u1;
    }

    public void setU1(BigInteger u1)
    {
        this.u1 = u1;
    }

    public BigInteger getU2()
    {
        return u2;
    }

    public void setU2(BigInteger u2)
    {
        this.u2 = u2;
    }

    public BigInteger getE()
    {
        return e;
    }

    public void setE(BigInteger e)
    {
        this.e = e;
    }

    public BigInteger getV()
    {
        return v;
    }

    public void setV(BigInteger v)
    {
        this.v = v;
    }

    public String toString()
    {
        StringBuffer result = new StringBuffer();

        result.append("u1: " + u1.toString());
        result.append("\nu2: " + u2.toString());
        result.append("\ne: " + e.toString());
        result.append("\nv: " + v.toString());

        return result.toString();
    }

    /**
     * convert the cipher-text in a byte array,
     * prepending them with 4 Bytes for their length
     *
     * @return a byte array of the cipher text.
     */
    public byte[] toByteArray()
    {
        byte[] u1Bytes = u1.toByteArray();
        int u1Length = u1Bytes.length;
        byte[] u2Bytes = u2.toByteArray();
        int u2Length = u2Bytes.length;
        byte[] eBytes = e.toByteArray();
        int eLength = eBytes.length;
        byte[] vBytes = v.toByteArray();
        int vLength = vBytes.length;

        int off = 0;
        byte[] result = new byte[u1Length + u2Length + eLength + vLength + 4 * 4];
        Pack.intToBigEndian(u1Length, result, off);
        off += 4;
        System.arraycopy(u1Bytes, 0, result, off, u1Length);
        off += u1Length;
        Pack.intToBigEndian(u2Length, result, off);
        off += 4;
        System.arraycopy(u2Bytes, 0, result, off, u2Length);
        off += u2Length;
        Pack.intToBigEndian(eLength, result, off);
        off += 4;
        System.arraycopy(eBytes, 0, result, off, eLength);
        off += eLength;
        Pack.intToBigEndian(vLength, result, off);
        off += 4;
        System.arraycopy(vBytes, 0, result, off, vLength);
        off += vLength;

        return result;
    }
}