public String MessageDecryptor(List <string> encryptedSequence, ElGamalBean el)
{
Encryptor encryptor = new Encryptor(el);
StringBuilder sb = new StringBuilder();
foreach (var item in encryptedSequence)
{
string[] aAndB = item.Split('|');
BigInteger a = new BigInteger(aAndB[0]);
BigInteger b = new BigInteger(aAndB[1]);
sb.Append(Convert.ToChar(encryptor.Decrypt(a, b)));
}
return(sb.ToString());
}
static void Main(string[] args)
{
ElGamalBean el = new ElGamalBean(new BigInteger(9473.ToString()),
new BigInteger(3878.ToString()),
new BigInteger(64.ToString()));
/*Encryptor encryptor = new Encryptor(el, new BigInteger(9.ToString()));
* Console.WriteLine(encryptor.GetA());
* Console.WriteLine( encryptor.GetB());
* encryptor.Decrypt(encryptor.GetA(), encryptor.GetB());*/
MessageEncryptor me = new MessageEncryptor();
string message = "hello";
List <string> encryptedSequence = me.EncryptMessage(message, el);
string decryptedHash = me.MessageDecryptor(encryptedSequence, el);
Console.WriteLine(decryptedHash);
MD5.MD5 hash = new MD5.MD5();
hash.Value = message;
Console.WriteLine(hash.Value);
if (decryptedHash == hash.Value)
{
Console.WriteLine("all right");
}
else
{
Console.WriteLine("error");
}
Encryptor e = new Encryptor(el);
BigInteger a = e.GetA();
BigInteger b = e.GetNDSAB(new BigInteger("104"));
Encryptor encryptor = new Encryptor(el);
BigInteger firstCheck = el.g.ModPow(new BigInteger("104"), el.p);
BigInteger secondChech = encryptor.GetSecondCheck();
}
public List <string> EncryptMessage(string message, ElGamalBean el)
{
Encryptor encryptor = new Encryptor(el);
MD5.MD5 hash = new MD5.MD5();
hash.Value = message;
List <string> encryptedSequence = new List <string>();
foreach (char item in hash.Value)
{
int messageSymbolAtInt = (int)item;
StringBuilder aAndB = new StringBuilder();
aAndB.Append(encryptor.GetA());
aAndB.Append('|');
aAndB.Append(encryptor.GetB(new BigInteger(messageSymbolAtInt.ToString())));
encryptedSequence.Add(aAndB.ToString());
}
return(encryptedSequence);
}
public Encryptor(ElGamalBean bean)
{
this.bean = bean;
}
