rijndaelmanaged

I'm trying to encrypt and decrypt a file stream over a socket using RijndaelManaged, but I keep bumping into the exception CryptographicException: Length of the data to decrypt is invalid. at System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) at System.Security.Cryptography.CryptoStream.FlushFinalBlock() at System.Security.Cryptography.CryptoStream.Dispose(Boolean disposing) The exception is thrown at the end of the using statement in receiveFile, when the whole file has been transferred. I tried searching the web

I know other questions have been asked on this but none so far have provided a solution or are exactly the issue I have. The class below handles the encryption and decryption of strings, the key and vector passed in are ALWAYS the same. The strings being encrypted and decrypted are always numbers, most work but the occasional one fails when decrypting (but only on the production server). I should mention that both local and production environments are in IIS6 on Windows Server 2003, the code that uses the class sits in a .ashx handler. The example that fails on the production server is

I have been given a Java implementation for encryption but unfortunately we are a .net shop and I have no way of incorporating the Java into our solution. Sadly, I'm also not a Java guy so I've been fighting with this for a few days and thought I'd finally turn here for help. I've searched high and low for a way to match the way the Java encryption is working and I've come to the resolution that I need to use RijndaelManaged in c#. I'm actually really close. The strings that I'm returning in c# are matching the first half, but the second half are different. Here is a snippet of the java

I use the following code to initialize encryption... Dim symmetricKey As New System.Security.Cryptography.RijndaelManaged() With symmetricKey .Key = Encoding.ASCII.GetBytes(Key) .IV = Encoding.ASCII.GetBytes(IV) .Mode = CipherMode.CBC .BlockSize = 128 .KeySize = 128 .Padding = PaddingMode.PKCS7 End With The requirement is to use PKCS5. Padding modes in vb.net only include ANSIX923 ISO10126 None PKCS7 Zeros So I don't think there is a method for PKCS5. Is there any way to add it, or do I need to write an encryption method myself? If so - how do I write that? Is there a reliable DLL that will

If I am using Rijndael CBC mode, I have no idea why we would need salt. My understanding is even if people know the password, but he cannot get the data without IV. So from my perspective, password + IV seem to be sufficent secure. Do I get anything wrong? Yes, you need all of these things. Salt (and an "iteration count") is used to derive a key from the password. Refer to PKCS #5 for more information. The salt and iteration count used for key derivation do not have to be secret. The salt should be unpredictable, however, and is best chosen randomly. CBC mode requires an initialization vector.