public CryptoContainer ValidateDecrypt(CryptoRequest request)
{
CryptoContainer container = null;
if (!request.SkipValidations)
{
container = CryptoContainer.CreateForDecryption(request);
var validationResult = container.ReadAndValidateDataForDecryption();
if (!validationResult.IsValid)
{
throw validationResult.ExceptionToThrow ?? new Exception("Unknown error");
}
request.IV = container.GetIV();
if (request.Password != null)
{
request.Key = container.CalculateKey();
}
}
if (request.Key == null || request.Key.Length != 32)
{
throw new ArgumentException("Key must be 32 bytes long.");
}
if (request.IV == null || request.IV.Length != 16)
{
throw new ArgumentException($"IV must be 16 bytes in length");
}
return(container);
}
internal static void Decrypt(CryptoRequest request)
{
CryptoContainer container = null;
if (!request.SkipValidations)
{
container = CryptoContainer.CreateForDecryption(request);
var validationResult = container.ReadAndValidateDataForDecryption();
if (!validationResult.IsValid)
{
throw validationResult.ExceptionToThrow ?? new Exception("Unknown error");
}
request.IV = container.GetIV();
if (request.Password != null)
{
request.Key = container.CalculateKey();
}
}
if (request.Key == null || request.Key.Length != 32)
{
throw new ArgumentException("Key must be 32 bytes long.");
}
if (request.IV == null || request.IV.Length != 16)
{
throw new ArgumentException($"IV must be 16 bytes in length");
}
using (var aes = new AesManaged())
{
aes.IV = request.IV;
aes.Key = request.Key;
aes.Padding = PaddingMode.ISO10126;
if (request.SkipValidations)
{
aes.Padding = PaddingMode.PKCS7;
}
aes.BlockSize = 128;
using (var decryptor = aes.CreateDecryptor())
{
CryptoStream cs = new CryptoStream(request.OutData, decryptor, CryptoStreamMode.Write);
int bufferSize = aes.BlockSize;
byte[] buffer = new byte[bufferSize];
int read = 0;
while ((read = request.InData.Read(buffer, 0, bufferSize)) > 0)
{
cs.Write(buffer, 0, read);
cs.Flush();
}
cs.FlushFinalBlock();
}
}
}