//on this class, we encrypt and decrypt the message
public static EncryptedMessage Cryptograph(byte[] simetricKey, string message)
{
EncryptedMessage ret = new EncryptedMessage();
using (Aes aes = new AesCryptoServiceProvider())
{
aes.Key = simetricKey;
ret.iv = CommonBusiness.bytesToString(aes.IV);
// Encrypt the message
using (MemoryStream ciphertext = new MemoryStream())
using (CryptoStream cs = new CryptoStream(ciphertext, aes.CreateEncryptor(), CryptoStreamMode.Write))
{
byte[] plaintextMessage = Encoding.UTF8.GetBytes(message);
cs.Write(plaintextMessage, 0, plaintextMessage.Length);
cs.Close();
ret.encryptedText = CommonBusiness.bytesToString(ciphertext.ToArray());
}
}
return(ret);
}
public static string Decryptograph(byte[] simetricKey, EncryptedMessage message)
{
string ret;
using (Aes aes = new AesCryptoServiceProvider())
{
aes.Key = simetricKey;
aes.IV = CommonBusiness.stringToBytes(message.iv);
// Decrypt the message
using (MemoryStream plaintext = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(plaintext, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
byte[] encBytes = CommonBusiness.stringToBytes(message.encryptedText);
cs.Write(encBytes, 0, encBytes.Length);
cs.Close();
ret = Encoding.UTF8.GetString(plaintext.ToArray());
}
}
}
return(ret);
}