cipherFileDecrypt

Decrypt a file with block cipher.

Syntax

Public Function cipherFileDecrypt ( _
    szFileOut As String, _
    szFileIn As String, _
    lpKey() As Byte, _
    lpIV() As Byte, _
    szAlgModePad As String, _
    Optional nOptions As Long = 0 _
) As Long

Parameters

szFileOut

Name of output file to be created or overwritten.

szFileIn

Name of input file.

lpKey

Key of exact length for block cipher algorithm.

lpIV

Initialization Vector (IV) of exactly the block size, or empty array for ECB mode or if IV already prefixed to input.

szAlgModePad

String with block cipher algorithm, mode and padding, e.g. "aes128/cbc/pkcs5"

Alg:  aes128|aes192|aes256|tdea|3des|desede3
Mode: ecb|cbc|ofb|cfb|ctr
Pad:  pkcs5|nopad|oneandzeroes|ansix923|w3c

nOptions

Add API_IV_PREFIX to expect the IV to be prepended before the ciphertext in the input (ignored for ECB mode).

Return Value

Remarks