public string Encrypt(string plainText, string password)
{
RijndaelManaged myRijndael = new RijndaelManaged();
string keyPT = password;
string saltString = GetRandomSalt().Substring(0, 24);
byte[] salt = Encoding.ASCII.GetBytes(saltString);
saltString = Convert.ToBase64String(salt);
int myIterations = 1000; //Both encrypt and decrypt need to use the same number of iterations for the encryption/decryption to work. Default to 1,000
Rfc2898DeriveBytes derivedBytesKey = new Rfc2898DeriveBytes(keyPT, salt, myIterations);
// Sets correct size (/8)
myRijndael.Key = derivedBytesKey.GetBytes(myRijndael.KeySize / 8);
myRijndael.IV = derivedBytesKey.GetBytes(myRijndael.BlockSize / 8);
// Encrypt the string to an array of bytes.
byte[] encryptedBytes = EncryptStringToBytesAES(plainText, myRijndael.Key, myRijndael.IV);
string encryptedBase64 = Convert.ToBase64String(encryptedBytes);
//***** Key/Salt
saltString = HexConversion.TextToHex(saltString.Trim());
//***** Encrypted value
string encrypted = HexConversion.TextToHex(encryptedBase64.Trim());
//***** Combine the encrypted text with the key/salt and return
string encryptedString = encrypted + " " + saltString;
return(encryptedString);
}
public string GetRandomSalt()
{
RNGCryptoServiceProvider random = new RNGCryptoServiceProvider();
byte[] salt = new byte[32]; //256 bits
random.GetBytes(salt);
return(HexConversion.BytesToHex(salt));
}
public string Decrypt(string encryptedText, string password)
{
RijndaelManaged myRijndael = new RijndaelManaged();
string keyPT = password;
encryptedText = HexConversion.HexToText(encryptedText);
string salt = encryptedText.Substring(encryptedText.Length - 32); //Since the encryption is a random length, the trailing right 32 characters will always be the salt value
string encrypted = encryptedText.Substring(0, (encryptedText.Length - 32)).Trim();
byte[] saltBytes = Convert.FromBase64String(salt);
int myIterations = 1000; //Both encrypt and decrypt need to use the same number of iterations for the encryption/decryption to work. Default to 1,000
Rfc2898DeriveBytes derivedBytesKey = new Rfc2898DeriveBytes(keyPT, saltBytes, myIterations);
// Sets correct size (/8)
myRijndael.Key = derivedBytesKey.GetBytes(myRijndael.KeySize / 8);
myRijndael.IV = derivedBytesKey.GetBytes(myRijndael.BlockSize / 8);
byte[] decryptedBytes = new byte[encrypted.Length];
decryptedBytes = Convert.FromBase64String(encrypted);
string decryptedString = DecryptStringFromBytesAES(decryptedBytes, myRijndael.Key, myRijndael.IV);
return(decryptedString);
}