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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/RSA-code/C-sharp/rsa-code.cs Normal file
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using System;
using System.Numerics;
using System.Text;
class Program
{
static void Main(string[] args)
{
BigInteger n = BigInteger.Parse("9516311845790656153499716760847001433441357");
BigInteger e = 65537;
BigInteger d = BigInteger.Parse("5617843187844953170308463622230283376298685");
const string plaintextstring = "Hello, Rosetta!";
byte[] plaintext = ASCIIEncoding.ASCII.GetBytes(plaintextstring);
BigInteger pt = new BigInteger(plaintext);
if (pt > n)
throw new Exception();
BigInteger ct = BigInteger.ModPow(pt, e, n);
Console.WriteLine("Encoded: " + ct);
BigInteger dc = BigInteger.ModPow(ct, d, n);
Console.WriteLine("Decoded: " + dc);
string decoded = ASCIIEncoding.ASCII.GetString(dc.ToByteArray());
Console.WriteLine("As ASCII: " + decoded);
}
}