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

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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.openpgp.operator.jcajce;

import java.io.IOException;
import java.math.BigInteger;

import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x9.ECNamedCurveTable;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.asn1.x9.X9ECPoint;
import org.bouncycastle.crypto.asymmetric.ECDomainParameters;
import org.bouncycastle.crypto.asymmetric.ECDomainParametersIndex;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.util.BigIntegers;

/**
 * Basic utility class
 */
class JcaJcePGPUtil
{
    static final ASN1ObjectIdentifier cryptlib = new ASN1ObjectIdentifier("1.3.6.1.4.1.3029");

    static final ASN1ObjectIdentifier ecc = cryptlib.branch("1").branch("5");

    // GNU
    static final ASN1ObjectIdentifier curvey25519 = ecc.branch("1");

    static final ASN1ObjectIdentifier ellipticCurve = new ASN1ObjectIdentifier("1.3.6.1.4.1.11591.15");

    static final ASN1ObjectIdentifier Ed25519 = ellipticCurve.branch("1");

    public static SecretKey makeSymmetricKey(
        int             algorithm,
        byte[]          keyBytes)
        throws PGPException
    {
        String    algName = org.bouncycastle.openpgp.PGPUtil.getSymmetricCipherName(algorithm);

        if (algName == null)
        {
            throw new PGPException("unknown symmetric algorithm: " + algorithm);
        }

        return new SecretKeySpec(keyBytes, algName);
    }

    static ECPoint decodePoint(
        BigInteger encodedPoint,
        ECCurve curve)
        throws IOException
    {
        return curve.decodePoint(BigIntegers.asUnsignedByteArray(encodedPoint));
    }

    static X9ECParameters getX9Parameters(ASN1ObjectIdentifier curveOID)
    {
        ECDomainParameters ecParams = ECDomainParametersIndex.lookupDomainParameters(curveOID);

        if (ecParams == null)
        {
            return ECNamedCurveTable.getByOID(curveOID);
        }

        return new X9ECParameters(ecParams.getCurve(), new X9ECPoint(ecParams.getG()), ecParams.getN(), ecParams.getH(), ecParams.getSeed());
    }
}