public string Encrypt(string message)
{
byte[] getBytes = conversion.ConvertToByteArray(message, Encoding.ASCII);
string plain_bits = conversion.ToBinary(getBytes);
BigInteger plain_number = conversion.BinaryToNumber(plain_bits);
Ciphers = mathUtil.Fast_Exponent(plain_number, PUBLIC_KEY, N);
string cipher_bits = Extension.BigIntegerExtensions.ToBinaryString(Ciphers);
for (int i = 0; i < cipher_bits.Length % 8; i++)
{
cipher_bits = "0" + cipher_bits;
}
return(conversion.BinaryToString(cipher_bits));
}
public string Encrypt(string message)
{
do
{
//K = mathUtil.RandomInRange(RandomNumberGenerator.Create(), 2, P - 2);
K = mathUtil.GetRandomNumber(key_size);
} while (K < 2 || K > P - 2);
// string cipher_bits = conversion.StringToBinary(message);
byte[] getBytes = conversion.ConvertToByteArray(message, Encoding.ASCII);
string cipher_bits = conversion.ToBinary(getBytes);
int length = 0;
if (cipher_bits.Length % key_size == 0)
{
length = cipher_bits.Length / key_size;
}
else
{
length = cipher_bits.Length / key_size + 1;
}
BigInteger[] plain_numbers = new BigInteger[length];
for (int i = 0; i < plain_numbers.Length; i++)
{
string temp = "";
if (cipher_bits.Length < key_size)
{
temp = cipher_bits.Substring(0, cipher_bits.Length);
cipher_bits = cipher_bits.Remove(0, cipher_bits.Length);
}
else
{
temp = cipher_bits.Substring(0, key_size);
cipher_bits = cipher_bits.Remove(0, key_size);
}
plain_numbers[i] = conversion.BinaryToNumber(temp);
}
// calculate c1, c2
c1 = mathUtil.Fast_Exponent(G, K, P);
c2 = new BigInteger[plain_numbers.Length];
BigInteger expo = mathUtil.Fast_Exponent(PUBLIC_KEY, K, P);
for (int i = 0; i < plain_numbers.Length; i++)
{
c2[i] = ((plain_numbers[i] % P) * expo) % P;
}
// change c2 into binary -> get cipher text
string encrypt_txt = "";
for (int i = 0; i < c2.Length; i++)
{
string temp = Extension.BigIntegerExtensions.ToBinaryString(c2[i]);
for (int j = 0; j < temp.Length % 8; j++)
{
temp = "0" + temp;
}
encrypt_txt += conversion.BinaryToString(temp);
}
return(encrypt_txt);
}
