private AsymmetricKeyParameter GetPubKeyParams(Pkcs11KeyInfo privKeyInfo, Pkcs11KeyInfo pubKeyInfo)
{
if (privKeyInfo != null && (privKeyInfo.CkaKeyType != (ulong)CKK.CKK_RSA && privKeyInfo.CkaKeyType != (ulong)CKK.CKK_ECDSA))
{
throw new Exception("Unsupported key type");
}
if (pubKeyInfo != null && (pubKeyInfo.CkaKeyType != (ulong)CKK.CKK_RSA && pubKeyInfo.CkaKeyType != (ulong)CKK.CKK_ECDSA))
{
throw new Exception("Unsupported key type");
}
Pkcs11KeyInfo rsaKeyInfo = (privKeyInfo != null) ? privKeyInfo : pubKeyInfo;
using (ISession session = _slot.OpenSession(SessionType.ReadWrite))
{
if (privKeyInfo.CkaKeyType == (ulong)CKK.CKK_RSA)
{
List <IObjectAttribute> attributes = session.GetAttributeValue(rsaKeyInfo.ObjectHandle, new List <CKA> {
CKA.CKA_MODULUS, CKA.CKA_PUBLIC_EXPONENT
});
BigInteger modulus = new BigInteger(1, attributes[0].GetValueAsByteArray());
BigInteger publicExponent = new BigInteger(1, attributes[1].GetValueAsByteArray());
return(new RsaKeyParameters(false, modulus, publicExponent));
}
else
{
List <IObjectAttribute> attributes = session.GetAttributeValue(rsaKeyInfo.ObjectHandle, new List <CKA> {
CKA.CKA_EC_POINT, CKA.CKA_EC_PARAMS
});
BigInteger modulus = new BigInteger(1, attributes[0].GetValueAsByteArray());
DerObjectIdentifier oid = DerObjectIdentifier.GetInstance(DerObjectIdentifier.FromByteArray(attributes[1].GetValueAsByteArray()));
Org.BouncyCastle.Asn1.X9.X9ECParameters ecParams = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByOid(oid);
byte[] ecPointArray1 = null;
byte[] ecPointArray = attributes[0].GetValueAsByteArray();
if (ecPointArray[1] > 127)
{
ecPointArray1 = new byte[ecPointArray.Length - 3];
Array.Copy(ecPointArray, 3, ecPointArray1, 0, ecPointArray1.Length);
}
else
{
ecPointArray1 = new byte[ecPointArray.Length - 2];
Array.Copy(ecPointArray, 2, ecPointArray1, 0, ecPointArray1.Length);
}
byte[] ecPointX = new byte[(ecPointArray1.Length - 1) / 2];
byte[] ecPointY = new byte[(ecPointArray1.Length - 1) / 2];
Array.Copy(ecPointArray1, 1, ecPointX, 0, ecPointX.Length);
Array.Copy(ecPointArray1, 1 + ecPointX.Length, ecPointY, 0, ecPointY.Length);
Org.BouncyCastle.Math.EC.ECPoint point = ecParams.Curve.CreatePoint(new BigInteger(1, ecPointX), new BigInteger(1, ecPointY));
ECDomainParameters ecDomainParams = new ECDomainParameters(ecParams.Curve, ecParams.G, ecParams.N, ecParams.H);
ECPublicKeyParameters ecPubKeyParams = new ECPublicKeyParameters(point, ecDomainParams);
return(ecPubKeyParams);
}
}
}
