/**
* return a X9ECParameters object representing the passed in named
* curve. The routine returns null if the curve is not present.
*
* @param name the name of the curve requested
* @return an X9ECParameters object or null if the curve is not available.
*/
public static X9ECParameters GetByName(string name)
{
X9ECParameters ecP = X962NamedCurves.GetByName(name);
if (ecP == null)
{
ecP = SecNamedCurves.GetByName(name);
}
if (ecP == null)
{
ecP = NistNamedCurves.GetByName(name);
}
if (ecP == null)
{
ecP = TeleTrusTNamedCurves.GetByName(name);
}
if (ecP == null)
{
ecP = AnssiNamedCurves.GetByName(name);
}
return(ecP);
}
static void ECCTest()
{
string curveName = "P-521";
var ecP1 = AnssiNamedCurves.GetByName("FRP256v1");
var ecP21 = TeleTrusTNamedCurves.GetByName("brainpoolp512t1");
var ecP = NistNamedCurves.GetByName(curveName);
var random = new SecureRandom();
var eCDomainParameters = new ECDomainParameters(ecP.Curve, ecP.G, ecP.N, ecP.H, ecP.GetSeed());
var pGen = new ECKeyPairGenerator();
var genParam = new ECKeyGenerationParameters(
eCDomainParameters,
random);
pGen.Init(genParam);
var asymmetricCipherKeyPair = pGen.GenerateKeyPair();
var senderPrivate = ((ECPrivateKeyParameters)asymmetricCipherKeyPair.Private).D.ToByteArray();
var senderPublic = ((ECPublicKeyParameters)asymmetricCipherKeyPair.Public).Q.GetEncoded();
var asymmetricCipherKeyPairA = pGen.GenerateKeyPair();
var recieverPrivate = ((ECPrivateKeyParameters)asymmetricCipherKeyPairA.Private).D.ToByteArray();
var recieverPublic = ((ECPublicKeyParameters)asymmetricCipherKeyPairA.Public).Q.GetEncoded();
var sharedSecret = GetSharedSecretValue(asymmetricCipherKeyPair, asymmetricCipherKeyPairA);
var deriveSecret = DeriveSymmetricKeyFromSharedSecret(sharedSecret);
var encrypted = Encrypt(Encoding.UTF8.GetBytes(original), deriveSecret);
var roundtrip = Encoding.UTF8.GetString(Decrypt(encrypted, deriveSecret));
string hex = Epic.Converters.HexString.Encode(encrypted);
string base64 = Convert.ToBase64String(encrypted);
Console.WriteLine("Byte: {0}", encrypted.Length);
Console.WriteLine("Hex: {0}, {1}", hex.Length, hex);
Console.WriteLine("Base64: {0}, {1}", base64.Length, base64);
Console.WriteLine("Decode: {0}", roundtrip);
}
public static X9ECParameters GetByName(string name)
{
X9ECParameters byName = X962NamedCurves.GetByName(name);
if (byName == null)
{
byName = SecNamedCurves.GetByName(name);
}
if (byName == null)
{
byName = NistNamedCurves.GetByName(name);
}
if (byName == null)
{
byName = TeleTrusTNamedCurves.GetByName(name);
}
if (byName == null)
{
byName = AnssiNamedCurves.GetByName(name);
}
return(byName);
}