ManagedRijndael Out of Memory Exception
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byte[] CryptographicKey = Convert.FromBase64String(txtCK.Text); byte[] IVector = new byte[16]; //16 bytes of IV Array.Copy(CryptographicKey, IVector, 16); //Get first 128-bits of CK as IV. //Set-up Rijndael as AES256 RijndaelManaged AES256 = new RijndaelManaged(); AES256.KeySize = 256; AES256.Mode = CipherMode.CBC; ICryptoTransform Encryptor = AES256.CreateEncryptor(CryptographicKey, IVector); //Prepare Writer for CipherText Ciphertext = new FileStream(txtOutputPath.Text, FileMode.Create, FileAccess.Write, FileShare.None); CryptoStream CStreamWriter = new CryptoStream(Ciphertext, Encryptor, CryptoStreamMode.Write); //Start the Encryption process CStreamWriter.Write(Plaintext, 0, Plaintext.Length); //OUT OF MEMORY EXCEPTION HERE CStreamWriter.FlushFinalBlock(); Ciphertext.Close(); CStreamWriter.Close();CStreamWriter.Write(Plaintext, 0, Plaintext.Length); //OUT OF MEMORY EXCEPTION HERE The code works fine for files smaller than 150mb, but when I tried to encrypt a 300mb file. I got that exception. I have 3gb of ram and when I started the encryption, my usage is only at 30%. What seems to be the problem? :^)It is said that the most complex structures built by mankind are software systems. This is not generally appreciated because most people cannot see them. Maybe that's a good thing because if we saw them as buildings, we'd deem many of them unsafe.
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byte[] CryptographicKey = Convert.FromBase64String(txtCK.Text); byte[] IVector = new byte[16]; //16 bytes of IV Array.Copy(CryptographicKey, IVector, 16); //Get first 128-bits of CK as IV. //Set-up Rijndael as AES256 RijndaelManaged AES256 = new RijndaelManaged(); AES256.KeySize = 256; AES256.Mode = CipherMode.CBC; ICryptoTransform Encryptor = AES256.CreateEncryptor(CryptographicKey, IVector); //Prepare Writer for CipherText Ciphertext = new FileStream(txtOutputPath.Text, FileMode.Create, FileAccess.Write, FileShare.None); CryptoStream CStreamWriter = new CryptoStream(Ciphertext, Encryptor, CryptoStreamMode.Write); //Start the Encryption process CStreamWriter.Write(Plaintext, 0, Plaintext.Length); //OUT OF MEMORY EXCEPTION HERE CStreamWriter.FlushFinalBlock(); Ciphertext.Close(); CStreamWriter.Close();CStreamWriter.Write(Plaintext, 0, Plaintext.Length); //OUT OF MEMORY EXCEPTION HERE The code works fine for files smaller than 150mb, but when I tried to encrypt a 300mb file. I got that exception. I have 3gb of ram and when I started the encryption, my usage is only at 30%. What seems to be the problem? :^)It is said that the most complex structures built by mankind are software systems. This is not generally appreciated because most people cannot see them. Maybe that's a good thing because if we saw them as buildings, we'd deem many of them unsafe.
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Allocating a memory block of 300M at a time is not a good idea... Try to split the file into smaller pieces and then encrypt.
Will the output still be the same?
It is said that the most complex structures built by mankind are software systems. This is not generally appreciated because most people cannot see them. Maybe that's a good thing because if we saw them as buildings, we'd deem many of them unsafe.
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Will the output still be the same?
It is said that the most complex structures built by mankind are software systems. This is not generally appreciated because most people cannot see them. Maybe that's a good thing because if we saw them as buildings, we'd deem many of them unsafe.
Yes, if each piece is encrypted with the same key and IV. And remember to use the same size to decrypt. Sample:
//Start the Encryption process FileStream fs = new FileStream(f, FileMode.Open); byte[] data=new byte[1024]; while (true) { int i = fs.Read(data, 0, 1024); if (i <= 0) break; else { CStreamWriter.Write(data, 0, 1024); //OUT OF MEMORY EXCEPTION HERE CStreamWriter.FlushFinalBlock(); } }modified on Sunday, May 11, 2008 7:19 AM
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Yes, if each piece is encrypted with the same key and IV. And remember to use the same size to decrypt. Sample:
//Start the Encryption process FileStream fs = new FileStream(f, FileMode.Open); byte[] data=new byte[1024]; while (true) { int i = fs.Read(data, 0, 1024); if (i <= 0) break; else { CStreamWriter.Write(data, 0, 1024); //OUT OF MEMORY EXCEPTION HERE CStreamWriter.FlushFinalBlock(); } }modified on Sunday, May 11, 2008 7:19 AM
Thanks! I'll give it a try. :)
It is said that the most complex structures built by mankind are software systems. This is not generally appreciated because most people cannot see them. Maybe that's a good thing because if we saw them as buildings, we'd deem many of them unsafe.