// Based on RFCs 5480 and 5915, a named curve is used whenever possible.
public IEcKey GetPublicKey(byte[] q, string curve)
{
ECPublicKeyParameters ecPublicKeyParameter;
if (curve == "curve25519")
{
ecPublicKeyParameter = GetNonStandardCurve(q, curve);
}
else
{
DerObjectIdentifier curveOid = ECNamedCurveTable.GetOid(curve) ?? CustomNamedCurves.GetOid(curve);
X9ECParameters curveParameters = CustomNamedCurves.GetByOid(curveOid) ?? ECNamedCurveTable.GetByOid(curveOid);
ECPoint qPoint = curveParameters.Curve.DecodePoint(q);
ecPublicKeyParameter = new ECPublicKeyParameters("EC", qPoint, curveOid);
}
byte[] publicKeyContent = GetPublicKey(ecPublicKeyParameter);
int keyLength = GetKeyLength(ecPublicKeyParameter);
string curveName = curveNameMapper.MapCurveToName(ecPublicKeyParameter.Parameters.Curve);
return(new EcKey(publicKeyContent, AsymmetricKeyType.Public, keyLength, curveName));
}
/**
* Parse a secret key from one of the GPG S expression keys.
*
* @return a secret key object.
*/
public static PgpSecretKey ParseSecretKeyFromSExpr(Stream inputStream, char[] passPhrase)
{
SXprUtilities.SkipOpenParenthesis(inputStream);
string type = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
if (type.Equals("protected-private-key"))
{
SXprUtilities.SkipOpenParenthesis(inputStream);
string curveName;
string keyType = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
if (keyType.Equals("ecc"))
{
SXprUtilities.SkipOpenParenthesis(inputStream);
string curveID = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
curveName = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
if (curveName.StartsWith("NIST "))
{
curveName = curveName.Substring("NIST ".Length);
}
SXprUtilities.SkipCloseParenthesis(inputStream);
}
else
{
throw new PgpException("no curve details found");
}
byte[] qVal;
SXprUtilities.SkipOpenParenthesis(inputStream);
type = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
if (type.Equals("q"))
{
qVal = SXprUtilities.ReadBytes(inputStream, inputStream.ReadByte());
}
else
{
throw new PgpException("no q value found");
}
PublicKeyPacket pubPacket = new PublicKeyPacket(PublicKeyAlgorithmTag.ECDsa, DateTime.UtcNow,
new ECDsaPublicBcpgKey(ECNamedCurveTable.GetOid(curveName), new BigInteger(1, qVal)));
SXprUtilities.SkipCloseParenthesis(inputStream);
byte[] dValue = GetDValue(inputStream, passPhrase, curveName);
// TODO: check SHA-1 hash.
return(new PgpSecretKey(new SecretKeyPacket(pubPacket, SymmetricKeyAlgorithmTag.Null, null, null,
new ECSecretBcpgKey(new BigInteger(1, dValue)).GetEncoded()), new PgpPublicKey(pubPacket)));
}
throw new PgpException("unknown key type found");
}
internal static PgpSecretKey DoParseSecretKeyFromSExpr(Stream inputStream, byte[] rawPassPhrase, bool clearPassPhrase)
{
SXprUtilities.SkipOpenParenthesis(inputStream);
string text = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
if (text.Equals("protected-private-key"))
{
SXprUtilities.SkipOpenParenthesis(inputStream);
string text2 = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
if (text2.Equals("ecc"))
{
SXprUtilities.SkipOpenParenthesis(inputStream);
SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
string text3 = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
if (Platform.StartsWith(text3, "NIST "))
{
text3 = text3.Substring("NIST ".get_Length());
}
SXprUtilities.SkipCloseParenthesis(inputStream);
SXprUtilities.SkipOpenParenthesis(inputStream);
text = SXprUtilities.ReadString(inputStream, inputStream.ReadByte());
if (text.Equals("q"))
{
byte[] bytes = SXprUtilities.ReadBytes(inputStream, inputStream.ReadByte());
PublicKeyPacket publicKeyPacket = new PublicKeyPacket(PublicKeyAlgorithmTag.ECDsa, global::System.DateTime.get_UtcNow(), new ECDsaPublicBcpgKey(ECNamedCurveTable.GetOid(text3), new BigInteger(1, bytes)));
SXprUtilities.SkipCloseParenthesis(inputStream);
byte[] dValue = GetDValue(inputStream, rawPassPhrase, clearPassPhrase, text3);
return(new PgpSecretKey(new SecretKeyPacket(publicKeyPacket, SymmetricKeyAlgorithmTag.Null, null, null, new ECSecretBcpgKey(new BigInteger(1, dValue)).GetEncoded()), new PgpPublicKey(publicKeyPacket)));
}
throw new PgpException("no q value found");
}
throw new PgpException("no curve details found");
}
throw new PgpException("unknown key type found");
}
