public static CipheredStringMessage EncryptString(this StringMessage stringMessage, KeyFactory keyFactory)
{
var hash = stringMessage.Hash ?? throw new NullReferenceException();
var keyP = keyFactory?.PublicKeyP?.KeyValue ?? throw new NullReferenceException();
var keyG = keyFactory?.PublicKeyG?.KeyValue ?? throw new NullReferenceException();
var keyA = keyFactory?.PrivateKeyA?.KeyValue ?? throw new NullReferenceException();
var keyH = keyFactory?.PublicKeyH?.KeyValue ?? throw new NullReferenceException();
var keyR = keyFactory?.RandomKeyR?.KeyValue ?? throw new NullReferenceException();
var cipheredStringMessage = new CipheredStringMessage();
var Message = new BigInteger(stringMessage.Hash);
cipheredStringMessage.HashC1 = (keyG.modPow(keyR, keyP))
.getBytes();
cipheredStringMessage.HashC2 = (Message * keyH.modPow(keyR, keyP))
.getBytes();
return(cipheredStringMessage);
}
public static StringMessage DecryptString(this CipheredStringMessage cipheredStringMessage, KeyFactory keyFactory)
{
var c1 = cipheredStringMessage.HashC1 ?? throw new NullReferenceException();
var c2 = cipheredStringMessage.HashC2 ?? throw new NullReferenceException();
var keyA = keyFactory?.PrivateKeyA?.KeyValue ?? throw new NullReferenceException();
var keyP = keyFactory?.PublicKeyP?.KeyValue ?? throw new NullReferenceException();
var stringMessage = new StringMessage();
BigInteger DecryptedFileNum = new BigInteger(0);
BigInteger bufferC1 = new BigInteger(c1);
BigInteger bufferC2 = new BigInteger(c2);
DecryptedFileNum = (bufferC2 * 1 / bufferC1.modPow(keyA, keyP));
stringMessage.Hash = DecryptedFileNum.getBytes();
stringMessage.VisibleText = Encoding.ASCII.GetString(stringMessage.Hash);
return(stringMessage);
}
