public static void Decrypt(Stream inputStream, Stream outputStream, EncryptedAesKey encryptedAesKey, RSAParameters receiverKey)
{
if (inputStream == null)
{
throw new ArgumentNullException(nameof(inputStream));
}
if (encryptedAesKey == null)
{
throw new ArgumentNullException(nameof(encryptedAesKey));
}
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
rsa.ImportParameters(receiverKey);
var decryptedKey = rsa.Decrypt(encryptedAesKey.EncryptedKey, false);
var decryptedIv = rsa.Decrypt(encryptedAesKey.EncryptedIV, false);
using (Aes aes = Aes.Create())
{
if (aes == null)
{
throw new Exception("Error while initializing AES instance.");
}
aes.Key = decryptedKey;
aes.IV = decryptedIv;
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
inputStream.Position = 0;
CryptoTransformStream(inputStream, outputStream, decryptor);
}
}
}
public static Dictionary <string, EncryptedAesKey> Encrypt(Stream inputStream, Stream outputStream, List <Receiver> receiversList)
{
if (inputStream == null)
{
throw new ArgumentNullException(nameof(inputStream));
}
if (receiversList == null)
{
throw new ArgumentNullException(nameof(receiversList));
}
inputStream.Position = 0;
using (Aes aes = Aes.Create())
{
if (aes == null)
{
throw new Exception("Error while initializing AES instance.");
}
aes.GenerateKey();
aes.GenerateIV();
ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
CryptoTransformStream(inputStream, outputStream, encryptor);
var encryptedKeys = new Dictionary <string, EncryptedAesKey>();
foreach (var receiver in receiversList)
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
rsa.ImportParameters(receiver.RsaKey);
var encryptedKey = rsa.Encrypt(aes.Key, false);
var encryptedIv = rsa.Encrypt(aes.IV, false);
var userAesKey = new EncryptedAesKey(encryptedKey, encryptedIv);
encryptedKeys.Add(receiver.Email, userAesKey);
}
}
return(encryptedKeys);
}
}
