The EncryptFile method will encrypt the
contents of a file using a 256-bit AES (Advanced Encryption Standard)
stores the encrypted data in the specified output file. The password (or
passphrase) provided by the caller is used to generate a SHA-256 hash
value which is used as part of the encryption process. The identical
password is required to decrypt the data using the
Although it is not required for your application to use a password
to encrypt the data, it is recommended. If no password is specified,
any other application that uses this control will be able to decrypt
the data. Passwords are case-sensitive and must match exactly,
including the use of any spaces.
A temporary file is created during the encryption process and the
output file is created or overwritten only if the input file could be
successfully encrypted. If the encryption fails, no output file will
If you wish to encrypt or decrypt string values, use the
DecryptedText and EncryptedText properties.
This method uses the Microsoft CryptoAPI and the RSA AES
cryptographic provider. This provider may not be available in some
languages, countries or regions. The availability of this provider may
also be constrained by cryptography export restrictions imposed by the
United States or other countries. If the required cryptographic
provider is not available, the method will fail.