org.bouncycastle.its.operator.ECDSAEncoder Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpkix-jdk15to18 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 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.its.operator;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.sec.SECObjectIdentifiers;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EccP256CurvePoint;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EccP384CurvePoint;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EcdsaP256Signature;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EcdsaP384Signature;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.Signature;
import org.bouncycastle.util.BigIntegers;

public class ECDSAEncoder
{
    public static byte[] toX962(Signature signature)
    {
        byte[] r;
        byte[] s;
        if (signature.getChoice() == Signature.ecdsaNistP256Signature || signature.getChoice() == Signature.ecdsaBrainpoolP256r1Signature)
        {
            EcdsaP256Signature sig = EcdsaP256Signature.getInstance(signature.getSignature());
            r = ASN1OctetString.getInstance(sig.getRSig().getEccp256CurvePoint()).getOctets();
            s = sig.getSSig().getOctets();
        }
        else
        {
            EcdsaP384Signature sig = EcdsaP384Signature.getInstance(signature.getSignature());
            r = ASN1OctetString.getInstance(sig.getRSig().getEccP384CurvePoint()).getOctets();
            s = sig.getSSig().getOctets();
        }

        try
        {
            return new DERSequence(new ASN1Encodable[]{new ASN1Integer(BigIntegers.fromUnsignedByteArray(r)),
                new ASN1Integer(BigIntegers.fromUnsignedByteArray(s))}).getEncoded();
        }
        catch (IOException ioException)
        {
            throw new RuntimeException("der encoding r & s");
        }
    }

    public static Signature toITS(ASN1ObjectIdentifier curveID, byte[] dsaEncoding)
    {
        ASN1Sequence asn1Sig = ASN1Sequence.getInstance(dsaEncoding);

        if (curveID.equals(SECObjectIdentifiers.secp256r1))
        {
            return new Signature(Signature.ecdsaNistP256Signature, new EcdsaP256Signature(
                new EccP256CurvePoint(EccP256CurvePoint.xonly, new DEROctetString(BigIntegers.asUnsignedByteArray(32, ASN1Integer.getInstance(asn1Sig.getObjectAt(0)).getValue()))),
                new DEROctetString(BigIntegers.asUnsignedByteArray(32, ASN1Integer.getInstance(asn1Sig.getObjectAt(1)).getValue()))));
        }
        if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP256r1))
        {
            return new Signature(Signature.ecdsaBrainpoolP256r1Signature, new EcdsaP256Signature(
                new EccP256CurvePoint(EccP256CurvePoint.xonly, new DEROctetString(BigIntegers.asUnsignedByteArray(32, ASN1Integer.getInstance(asn1Sig.getObjectAt(0)).getValue()))),
                new DEROctetString(BigIntegers.asUnsignedByteArray(32, ASN1Integer.getInstance(asn1Sig.getObjectAt(1)).getValue()))));
        }
        if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP384r1))
        {
            return new Signature(Signature.ecdsaBrainpoolP384r1Signature, new EcdsaP384Signature(
                new EccP384CurvePoint(EccP384CurvePoint.xonly, new DEROctetString(BigIntegers.asUnsignedByteArray(48, ASN1Integer.getInstance(asn1Sig.getObjectAt(0)).getValue()))),
                new DEROctetString(BigIntegers.asUnsignedByteArray(48, ASN1Integer.getInstance(asn1Sig.getObjectAt(1)).getValue()))));
        }

        throw new IllegalArgumentException("unknown curveID");
    }
}