Dim aes As Aes = Aes.Create()įileStream, aes.CreateDecryptor(key, iv), CryptoStreamMode.Read)ĬryptoStream cryptStream = new CryptoStream(įileStream, aes.CreateDecryptor(key, iv), CryptoStreamMode.Read) The SymmetricAlgorithm.CreateDecryptor method from the Aes instance is passed the IV value and the same key that was used for encryption. Next it instantiates a CryptoStream object and initializes it to the value of the fileStream instance.

It reads the initialization vector (IV) value from a managed stream variable, fileStream. This example first creates a new instance of the Aes implementation class. The instance is used to perform decryption on a CryptoStream object. The following example illustrates how to create a new instance of the default implementation class for the Aes algorithm. NET to decrypt data read from any managed stream object. The CryptoStream class is used with symmetric cryptography classes provided by. The decryption of data encrypted with symmetric algorithms is similar to the process used to encrypt data with symmetric algorithms. For public-key encryption, you must know either the public key (if the data was encrypted using the private key) or the private key (if the data was encrypted using the public key). For secret-key encryption, you must know both the key and IV that were used to encrypt the data. Decryption is the reverse operation of encryption.