(AutoIt) openssl enc decrypt

Demonstrates how to decrypt a file that was encrypted using "openssl enc".

This example shows how to decrypt what was created using this openssl command:

openssl enc -e -aes-256-cbc -in hamlet.xml -out hamlet.enc -pass file:./secret.txt

This example shows how to do this:

openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt

Note: This example requires Chilkat v11.1.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Local $bSuccess = False

; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

$oCrypt = ObjCreate("Chilkat.Crypt2")

; Use aes-256-cbc
$oCrypt.CryptAlgorithm = "aes"
$oCrypt.CipherMode = "cbc"
$oCrypt.KeyLength = 256

; We'll need to set the hash algorithm to either MD5 or SHA256.
; openssl version 1.0.* or earlier used MD5 by default
; openssl version 1.1.* uses SHA-256 for the password to secret key derivation.

; For example, if openssl 1.1.0 was used, we should do this:
$oCrypt.HashAlgorithm = "sha256"

; This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
$oCrypt.HashAlgorithm = "md5"

; The openssl command we are duplicating is:
; 
;    openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt
; 
; The file secret.txt contains the word "secret".  We could write code to load the contents
; of secret.txt, but instead we'll just do this:
$oCrypt.SetEncodedKey "secret","openssl"

; Load the file to be decrypted.
$oFileData = ObjCreate("Chilkat.BinData")
$bSuccess = $oFileData.LoadFile("qa_data/openssl_enc/hamlet.enc")

; Decrypt
$oCrypt.VerboseLogging = True
$bSuccess = $oCrypt.DecryptBd($oFileData)
ConsoleWrite($oCrypt.LastErrorText & @CRLF)

; Save the decrypted output.
$bSuccess = $oFileData.WriteFile("c:/temp/qa_output/hamlet_dec.xml")

ConsoleWrite("success = " & $bSuccess & @CRLF)