/// <summary>
/// Compare params
/// </summary>
/// <param name="parameters"></param>
/// <param name="other"></param>
/// <returns></returns>
public static bool SameAs(this EccParams parameters, EccParams other)
{
if (parameters == null)
{
return(other == null);
}
if (other == null)
{
return(false);
}
if (other.Curve != parameters.Curve)
{
return(false);
}
if (!KeyEx.SameNoLeadingZeros(other.X, parameters.X))
{
return(false);
}
if (!KeyEx.SameNoLeadingZeros(other.Y, parameters.Y))
{
return(false);
}
if (!KeyEx.SameNoLeadingZeros(other.T, parameters.T))
{
return(false);
}
if (!KeyEx.SameNoLeadingZeros(other.D, parameters.D))
{
return(false);
}
return(true);
}
/// <summary>
/// Returns the public part of the key
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static Key GetPublicKey(this EccParams key)
{
return(new Key {
Type = KeyType.ECC,
Parameters = new EccParams {
Curve = key.Curve,
X = key.X,
Y = key.Y,
T = key.T
}
});
}
/// <summary>
/// Clone params
/// </summary>
/// <param name="parameters"></param>
/// <returns></returns>
public static EccParams Clone(this EccParams parameters)
{
if (parameters == null)
{
return(null);
}
return(new EccParams {
Curve = parameters.Curve,
D = parameters.D,
T = parameters.T,
X = parameters.X,
Y = parameters.Y
});
}
/// <summary>
/// Convert to public key
/// </summary>
/// <param name="ecc"></param>
/// <returns></returns>
public static PublicKey ToPublicKey(this EccParams ecc)
{
var ecParameters = ecc.ToECParameters();
var curveOid = ecParameters.Curve.Oid.Value;
byte[] curveOidEncoded;
if (string.IsNullOrEmpty(curveOid))
{
var friendlyName = ecParameters.Curve.Oid.FriendlyName;
switch (friendlyName)
{
case "nistP256":
curveOid = Oids.Secp256r1;
break;
case "nistP384":
curveOid = Oids.Secp384r1;
break;
case "nistP521":
curveOid = Oids.Secp521r1;
break;
default:
curveOid = new Oid(friendlyName).Value;
break;
}
}
using (var writer = new AsnWriter(AsnEncodingRules.DER)) {
writer.WriteObjectIdentifier(curveOid);
curveOidEncoded = writer.Encode();
}
Debug.Assert(ecParameters.Q.X.Length == ecParameters.Q.Y.Length);
var uncompressedPoint =
new byte[1 + ecParameters.Q.X.Length + ecParameters.Q.Y.Length];
// Uncompressed point (0x04)
uncompressedPoint[0] = 0x04;
Buffer.BlockCopy(ecParameters.Q.X, 0, uncompressedPoint,
1, ecParameters.Q.X.Length);
Buffer.BlockCopy(ecParameters.Q.Y, 0, uncompressedPoint,
1 + ecParameters.Q.X.Length, ecParameters.Q.Y.Length);
var ecPublicKey = new Oid(Oids.EcPublicKey);
return(new PublicKey(
ecPublicKey,
new AsnEncodedData(ecPublicKey, curveOidEncoded),
new AsnEncodedData(ecPublicKey, uncompressedPoint)));
}
/// <summary>
/// Converts a WebKey of type EC or EC-HSM to an EC parameter object.
/// </summary>
/// <param name="ecParameters"></param>
/// <param name="includePrivateParameters">private material must be
/// included.</param>
/// <returns>An EC parameter object</returns>
public static ECParameters ToECParameters(this EccParams ecParameters,
bool includePrivateParameters = true)
{
KeyEx.VerifyNonZero(ecParameters.X);
KeyEx.VerifyNonZero(ecParameters.Y);
var keyParameterSize = ecParameters.Curve.GetKeyParameterSize();
if (includePrivateParameters && ecParameters.D != null)
{
KeyEx.VerifyNonZero(ecParameters.D);
ecParameters.D = KeyEx.ForceLength(ecParameters.D, keyParameterSize);
}
return(new ECParameters {
Curve = ecParameters.Curve.ToECCurve(),
D = ecParameters.D,
Q = new ECPoint {
X = KeyEx.ForceLength(ecParameters.X, keyParameterSize),
Y = KeyEx.ForceLength(ecParameters.Y, keyParameterSize)
}
});
}
/// <summary>
/// Verifies whether this object has a private key
/// </summary>
/// <returns> True if the object has private key; false otherwise.</returns>
public static bool HasPrivateKey(this EccParams key)
{
return(key.D != null);
}
