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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. 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.

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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");
    }
}