public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
var tag = new Asn1Tag();
buffer.Mark();
var num = buffer.DecodeTagAndLength(tag);
if (tag.Equals(0, 0, NullTypeCode))
{
buffer.Reset();
var element = new NullParams();
SetElement(Null, element);
Element.Decode(buffer, true, num);
}
else
{
if (!tag.Equals(0, 0x20, SequenceTypeCode))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1InvalidChoiceOptionTagException, tag, buffer.ByteCount);
}
buffer.Reset();
var parameters = new GostR34102001PublicKeyParameters();
SetElement(Params, parameters);
Element.Decode(buffer, true, num);
}
}
public void DecodeParameters(byte[] data)
{
if (data == null)
{
throw ExceptionUtility.ArgumentNull("data");
}
try
{
var asnDecoder = new Asn1BerDecodeBuffer(data);
var publicKeyParameters = new GostR34102001PublicKeyParameters();
publicKeyParameters.Decode(asnDecoder);
DigestParamSet = Asn1ObjectIdentifier.ToOidString(publicKeyParameters.DigestParamSet);
PublicKeyParamSet = Asn1ObjectIdentifier.ToOidString(publicKeyParameters.PublicKeyParamSet);
EncryptionParamSet = Asn1ObjectIdentifier.ToOidString(publicKeyParameters.EncryptionParamSet);
}
catch (Exception exception)
{
throw ExceptionUtility.CryptographicException(exception, Resources.Asn1DecodeError, typeof(GostR34102001PublicKeyParameters).FullName);
}
}
public byte[] EncodeParameters()
{
byte[] data;
var publicKeyParameters = new GostR34102001PublicKeyParameters();
try
{
publicKeyParameters.DigestParamSet = Asn1ObjectIdentifier.FromOidString(DigestParamSet);
publicKeyParameters.PublicKeyParamSet = Asn1ObjectIdentifier.FromOidString(PublicKeyParamSet);
publicKeyParameters.EncryptionParamSet = CreateEncryptionParamSet(EncryptionParamSet);
var asnEncoder = new Asn1BerEncodeBuffer();
publicKeyParameters.Encode(asnEncoder);
data = asnEncoder.MsgCopy;
}
catch (Exception exception)
{
throw ExceptionUtility.CryptographicException(exception, Resources.Asn1EncodeError, typeof(GostR34102001PublicKeyParameters).FullName);
}
return data;
}
private static SubjectPublicKeyInfo EncodePublicKey(GostKeyExchangeParameters transportParameters)
{
var asnEncoder = new Asn1BerEncodeBuffer();
var publicKey = new Asn1OctetString(transportParameters.PublicKey);
publicKey.Encode(asnEncoder);
var publicKeyValue = asnEncoder.MsgCopy;
var publicKeyInfo = new SubjectPublicKeyInfo
{
SubjectPublicKey = new Asn1BitString(publicKeyValue.Length * 8, publicKeyValue)
};
var publicKeyParams = new GostR34102001PublicKeyParameters
{
PublicKeyParamSet = Asn1ObjectIdentifier.FromOidString(transportParameters.PublicKeyParamSet),
DigestParamSet = Asn1ObjectIdentifier.FromOidString(transportParameters.DigestParamSet),
EncryptionParamSet = CreateEncryptionParamSet(transportParameters.EncryptionParamSet)
};
asnEncoder.Reset();
publicKeyParams.Encode(asnEncoder);
var publicKeyAlgOid = new Asn1ObjectIdentifier(GostR34102001Constants.IdGostR34102001);
publicKeyInfo.Algorithm = new AlgorithmIdentifier(publicKeyAlgOid, new Asn1OpenType(asnEncoder.MsgCopy));
return publicKeyInfo;
}
