Facing Memory Leaks in AES Encryption Method.
- by Mubashar Ahmad
Can anyone please identify is there any possible memory leaks in following code. I have tried with .Net Memory Profiler and it says "CreateEncryptor" and some other functions are leaving unmanaged memory leaks as I have confirmed this using Performance Monitors.
but there are already dispose, clear, close calls are placed wherever possible please advise me accordingly. its a been urgent.
public static string Encrypt(string plainText, string key)
{
//Set up the encryption objects
byte[] encryptedBytes = null;
using (AesCryptoServiceProvider acsp = GetProvider(Encoding.UTF8.GetBytes(key)))
{
byte[] sourceBytes = Encoding.UTF8.GetBytes(plainText);
using (ICryptoTransform ictE = acsp.CreateEncryptor())
{
//Set up stream to contain the encryption
using (MemoryStream msS = new MemoryStream())
{
//Perform the encrpytion, storing output into the stream
using (CryptoStream csS = new CryptoStream(msS, ictE, CryptoStreamMode.Write))
{
csS.Write(sourceBytes, 0, sourceBytes.Length);
csS.FlushFinalBlock();
//sourceBytes are now encrypted as an array of secure bytes
encryptedBytes = msS.ToArray(); //.ToArray() is important, don't mess with the buffer
csS.Close();
}
msS.Close();
}
}
acsp.Clear();
}
//return the encrypted bytes as a BASE64 encoded string
return Convert.ToBase64String(encryptedBytes);
}
private static AesCryptoServiceProvider GetProvider(byte[] key)
{
AesCryptoServiceProvider result = new AesCryptoServiceProvider();
result.BlockSize = 128;
result.KeySize = 256;
result.Mode = CipherMode.CBC;
result.Padding = PaddingMode.PKCS7;
result.GenerateIV();
result.IV = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
byte[] RealKey = GetKey(key, result);
result.Key = RealKey;
// result.IV = RealKey;
return result;
}
private static byte[] GetKey(byte[] suggestedKey, SymmetricAlgorithm p)
{
byte[] kRaw = suggestedKey;
List<byte> kList = new List<byte>();
for (int i = 0; i < p.LegalKeySizes[0].MaxSize; i += 8)
{
kList.Add(kRaw[(i / 8) % kRaw.Length]);
}
byte[] k = kList.ToArray();
return k;
}
