Method AesCrypt():prepareBuffer() Professional
Prepares a buffer for encryption.
:prepareBuffer(<cBuffer>) --> nLength
The length of the buffer is returned.
Because AES is a block code, a buffer must be at least as long as one block, additional space might be required depending on the operation mode.
This method must be called if the length of the buffer to encode overlaps one or multiple blocks. It is, however, automatically called by CryptFile() and CryptTable().
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