public static SqlString getDerivedKey(SqlString sharedSecret)
{
byte[] ssBytes = Encoding.ASCII.GetBytes(sharedSecret.ToString());
try
{
byte[] dk = BCFunctions.DeriveSymmetricKeyFromSharedSecret(ssBytes);
return(Convert.ToBase64String(dk));
}
catch { return(""); }
}
public static SqlString getSharedSecret(SqlString keySize, SqlString PrivateKey, SqlString PublicKey)
{
//X9ECParameters ecP = NistNamedCurves.GetByName("P-" + keySize.ToString());
//var c = (FpCurve)ecP.Curve;
//var eCDomainParameters = new ECDomainParameters(ecP.Curve, ecP.G, ecP.N, ecP.H, ecP.GetSeed());
BigInteger dA = new BigInteger(PrivateKey.ToString(), 10);
//ECPrivateKeyParameters keyParametersA = new ECPrivateKeyParameters(dA, eCDomainParameters);
byte[] pkBytes = dA.ToByteArray();
byte[] pbBytes = Convert.FromBase64String(PublicKey.ToString());
byte[] ss = BCFunctions.getSharedSecret(pkBytes, pbBytes);
return(Convert.ToBase64String(ss));
}
public static SqlString getSignature(SqlString keySize, SqlString PrivateKey, SqlString Message)
{
X9ECParameters ecParams = NistNamedCurves.GetByName("P-" + keySize.ToString());
ECDomainParameters domainParameters = new ECDomainParameters(ecParams.Curve, ecParams.G, ecParams.N, ecParams.H, ecParams.GetSeed());
var G = ecParams.G;
ECCurve curve = ecParams.Curve;
//private Key
BigInteger d = new BigInteger(PrivateKey.ToString(), 10);
ECPrivateKeyParameters keyParameters = new ECPrivateKeyParameters(d, domainParameters);
//public key
ECPoint q = domainParameters.G.Multiply(d);
ECPublicKeyParameters pubkeyParam = new ECPublicKeyParameters(q, domainParameters);
string s = Message.ToString();
var signature = BCFunctions.GetSignature(s, keyParameters);
var signedString = Convert.ToBase64String(signature);
var txtSignature = signedString;
return(txtSignature);
}
public static SqlXml generateKeys(SqlString keySize, SqlString network)
{
AsymmetricCipherKeyPair key = BCFunctions.GenerateKeys(Convert.ToInt16(keySize.ToString()));
ECPublicKeyParameters publicKeyParam = (ECPublicKeyParameters)key.Public;
ECPrivateKeyParameters privateKeyParam = (ECPrivateKeyParameters)key.Private;
var privateKey = privateKeyParam.D.ToString();
BigInteger d = new BigInteger(privateKey, 10);
var publicKey = BCFunctions.RetrievePublicKey(keySize.ToString(), d);
var addressText = "0x" + BitConverter.ToString(BCFunctions.Hash(publicKey, network.ToString())).Replace("-", "");
var r = "<sqroot><D>" + privateKey + "</D><Q>" + publicKey + "</Q><A>" + addressText + "</A></sqroot>";
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(r);
XmlNodeReader xnr = new XmlNodeReader(xmlDoc);
SqlXml rx = new SqlXml(xnr);
return(rx);
}
public static SqlString retrievePublicKey(SqlString keySize, SqlString privateKey)
{
BigInteger DString = new BigInteger(privateKey.ToString(), 10);
return(BCFunctions.RetrievePublicKey(keySize.ToString(), DString));
}