Class CryptFile() Professional
Class function of the CryptFile() class
Description
The CryptFile class provides encryption and decryption of files, such as text files. To encrypt a file, a crypt-provider object and a key-object is required. The crypt-provider determines the algorithm used for encryption, and the key-object provides the cipher key to be used by the crypt-provider.
SecureKey():destroy() can be called right after encrypting or decrypting a file. The key value is required during that operation.
Class methods
:new()
Creates an instance of the CryptFile class.
Instance variables
:bufferSize
Determines the buffer size for file encryption.
Methods
:encrypt()
Encrypts a file.
:decrypt()
Decrypts a file.
Examples
// In this example, a plain text file is encrypted using
// a supplied key
#include "crypt.ch"
PROCEDURE MAIN(cFile, cKey)
LOCAL oAes
LOCAL oFile
LOCAL oKey
// setup key object
oKey := SecureKey():new()
oKey:setStrKey(cKey)
// use AES for encryption
oAes := AesCrypt():new(oKey)
oFile := CryptFile():new(oAes, oKey)
// now encrypt file in two buffers
oFile:bufferSize := FSize(cFile)/2
oFile:encrypt(cFile, cFile+".enc")
// destroy key
oKey:destroy()
? cFile+".enc created"
RETURN
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