org.bouncycastle.openpgp.operator.jcajce.JceAEADCipherUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpg-debug-jdk15to18 Show documentation

The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5 to JDK 1.8. 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: 1.79

Show newest version

package org.bouncycastle.openpgp.operator.jcajce;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.jcajce.provider.symmetric.util.GcmSpecUtil;
import org.bouncycastle.jcajce.spec.AEADParameterSpec;
import org.bouncycastle.util.Arrays;

public class JceAEADCipherUtil
{
    static void setUpAeadCipher(Cipher aead, SecretKey secretKey, int mode, byte[] nonce, int aeadMacLen, byte[] aad)
        throws InvalidKeyException, InvalidAlgorithmParameterException
    {
        if (GcmSpecUtil.gcmSpecExtractable())
        {
            AlgorithmParameterSpec parameters;
            try
            {
                parameters = GcmSpecUtil.extractGcmSpec(new GCMParameters(nonce, (aeadMacLen + 7) / 8).toASN1Primitive());
            }
            catch (InvalidParameterSpecException e)
            {
                throw new InvalidAlgorithmParameterException(e.getMessage());
            }
            aead.init(mode, secretKey, parameters);
            aead.updateAAD(aad);
        }
        else
        {
            AEADParameterSpec parameters = new AEADParameterSpec(nonce, aeadMacLen, aad);
            aead.init(mode, secretKey, parameters);
        }
    }

    static class GCMParameters
        extends ASN1Object
    {
        private byte[] nonce;
        private int icvLen;

        public GCMParameters(
            byte[] nonce,
            int    icvLen)
        {
            this.nonce = Arrays.clone(nonce);
            this.icvLen = icvLen;
        }

        public byte[] getNonce()
        {
            return Arrays.clone(nonce);
        }

        public int getIcvLen()
        {
            return icvLen;
        }

        public ASN1Primitive toASN1Primitive()
        {
            ASN1EncodableVector v = new ASN1EncodableVector(2);

            v.add(new DEROctetString(nonce));

            if (icvLen != 12)
            {
                v.add(new ASN1Integer(icvLen));
            }

            return new DERSequence(v);
        }
    }
}