org.bouncycastle.crypto.engines.OldIESEngine Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bouncycastle Show documentation

The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

There is a newer version: 1.2.2.1-jre17

Show newest version

package org.bouncycastle.crypto.engines;

import org.bouncycastle.crypto.BasicAgreement;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.DerivationFunction;
import org.bouncycastle.crypto.Mac;
import org.bouncycastle.util.Pack;

/**
 * Support class for constructing integrated encryption ciphers
 * for doing basic message exchanges on top of key agreement ciphers.
 * Follows the description given in IEEE Std 1363a.
 */
public class OldIESEngine
    extends IESEngine
{
    /**
     * set up for use with stream mode, where the key derivation function
     * is used to provide a stream of bytes to xor with the message.
     *
     * @param agree the key agreement used as the basis for the encryption
     * @param kdf   the key derivation function used for byte generation
     * @param mac   the message authentication code generator for the message
     */
    public OldIESEngine(
        BasicAgreement agree,
        DerivationFunction kdf,
        Mac mac)
    {
        super(agree, kdf, mac);
    }


    /**
     * set up for use in conjunction with a block cipher to handle the
     * message.
     *
     * @param agree  the key agreement used as the basis for the encryption
     * @param kdf    the key derivation function used for byte generation
     * @param mac    the message authentication code generator for the message
     * @param cipher the cipher to used for encrypting the message
     */
    public OldIESEngine(
        BasicAgreement agree,
        DerivationFunction kdf,
        Mac mac,
        BufferedBlockCipher cipher)
    {
        super(agree, kdf, mac, cipher);
    }

    protected byte[] getLengthTag(byte[] p2)
    {
        byte[] L2 = new byte[4];
        if (p2 != null)
        {
            Pack.intToBigEndian(p2.length * 8, L2, 0);
        }
        return L2;
    }
}