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POCryptographicException when using RijndaelManaged
 

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  1. POCryptographicException when using RijndaelManaged
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    <p>I am trying to encrypt a string of text using the RijndaelManaged class in .NET. However, I keep getting a CryptographicException ("Length of the data to decrypt is invalid"). This message isn't exactly helpful, especially since its happening when I attempt to ENCRYPT data, not decrypt. Below is the code.</p> <pre><code>public static string EncryptKMSToken(string valueToEncrypt, string encryptionKey) { string results = string.Empty; using (RijndaelManaged aes = new RijndaelManaged()) { aes.BlockSize = 128; aes.KeySize = 128; aes.Padding = PaddingMode.PKCS7; aes.Mode = CipherMode.CBC; UTF8Encoding byteTransform = new UTF8Encoding(); aes.Key = byteTransform.GetBytes(encryptionKey); ICryptoTransform encryptor = aes.CreateDecryptor(aes.Key, aes.IV); using (MemoryStream stream = new MemoryStream()) { using (CryptoStream encryptStream = new CryptoStream(stream, encryptor, CryptoStreamMode.Write)) { using (StreamWriter writer = new StreamWriter(encryptStream)) { writer.Write(valueToEncrypt); } byte[] encryptedBytes = stream.ToArray(); results = byteTransform.GetString(encryptedBytes); } } } return results; } </code></pre> <p>The error happens when the 3rd using statement closes (i.e. the line after writer.Write(valueToEncrypt). If I try to move the two lines below that inside the third using block, I end up with an empty string (and the error still happens). I pulled this code directly off of this site (http://stackoverflow.com/questions/273452/using-aes-encryption-in-c-sharp) but it doesn't seem to work. Does anyone have any ideas?</p>
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    1. USMaarten Bodewes
    1. USShane McGarry
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    1. COTurning an UTF-8 string directly into a key is most likely a bad idea. You should use a hex or base64 key. Or if really necessary, a password together with a slow hash such as PBKDF2.
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      1. USCodesInChaos
 

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