public string rsa(string shortMessagetoEncrypt)
{
RSACryptoSystem cryptoSystem = new RSACryptoSystem(2048);
string msg = shortMessagetoEncrypt;
byte[] encypt = cryptoSystem.EncryptString(msg);
string decrypt = cryptoSystem.DecryptString(encypt);
Dictionary <string, object> json = new Dictionary <string, object>();
json.Add("data", msg);
json.Add("encrypt", cryptoSystem.ConvertEncryptString(encypt));
json.Add("decrypt", decrypt);
return(JsonConvert.SerializeObject(json));
}
static void LogStringEncryptionDecryption()
{
var originalString = "I want to see this";
var rsaKeyPair = RSAKeyPairGenerator.GenerateRSAKeyPair();
var encryptedString = RSACryptoSystem.Encrypt(originalString, rsaKeyPair.Public);
_logger.Info("Encrypting strings...");
_logger.Info(" Original text: {0} \n Encrypted text: {1}", originalString, encryptedString);
originalString = RSACryptoSystem.Decrypt(encryptedString, rsaKeyPair.Private);
_logger.Info("Decrypting strings...");
_logger.Info(" Encrypted text: {0} \n Original text: {1}", encryptedString, originalString);
}
public void SendMessageTo(IUser to, BigInteger messageContents)
{
_logger.Info("Sending message from '{0}' to '{1}'. Message contents: {2}", this.Name, to.Name, messageContents);
var enctyptedMessageContents = RSACryptoSystem.Encrypt(messageContents, to.PublicKey);
var originalSignature = RSACryptoSystem.CreateSignature(messageContents, _rsaKeyPair.Private);
_logger.Info("Generated original signature: {0}", originalSignature);
var encryptedSignature = RSACryptoSystem.Encrypt(originalSignature, to.PublicKey);
_logger.Info("Attaching encrypted signature: {0}", encryptedSignature);
var message = new Message(enctyptedMessageContents, encryptedSignature);
to.ReceiveMessageFrom(this, message);
}
static void LogNumericEncryptionDecryption()
{
BigInteger originalNumber = BigInteger.Parse("12345678987654321123456789");
var rsaKeyPair = RSAKeyPairGenerator.GenerateRSAKeyPair();
var encryptedNumber = RSACryptoSystem.Encrypt(originalNumber, rsaKeyPair.Public);
_logger.Info("Encrypting numbers...");
_logger.Info(" Original number: {0} \n Encrypted number: {1}", originalNumber, encryptedNumber);
originalNumber = RSACryptoSystem.Decrypt(encryptedNumber, rsaKeyPair.Private);
_logger.Info("Decrypting numbers...");
_logger.Info(" Encrypted number: {0} \n Original number: {1}", encryptedNumber, originalNumber);
}
public bool ReceiveMessageFrom(IUser from, Message message)
{
_logger.Info("Received encrypted message from user '{0}'. Message contents (encrypted): {1}", from.Name, message.EnctyptedContents);
var decryptedMessageContents = RSACryptoSystem.Decrypt(message.EnctyptedContents, _rsaKeyPair.Private);
_logger.Info("Decrypted message contents: {0}", decryptedMessageContents);
_logger.Info("Encrypted signature: {0}", message.EncryptedSignature);
var decryptedSignature = RSACryptoSystem.Decrypt(message.EncryptedSignature, _rsaKeyPair.Private);
_logger.Info("Decrypted signature: {0}", decryptedSignature);
var isSignatureValid = RSACryptoSystem.CheckSignatureIsValid(decryptedMessageContents, decryptedSignature,
from.PublicKey);
_logger.Info("Is signature valid: {0}", isSignatureValid);
return(isSignatureValid);
}
