(Lianja) 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 v9.5.0.71 or later.

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loCrypt = createobject("CkCrypt2")

// Use aes-256-cbc
loCrypt.CryptAlgorithm = "aes"
loCrypt.CipherMode = "cbc"
loCrypt.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:
loCrypt.HashAlgorithm = "sha256"

// This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
loCrypt.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:
loCrypt.SetSecretKeyViaPassword("secret")

// Load the file to be decrypted.
loFileData = createobject("CkBinData")
llSuccess = loFileData.LoadFile("qa_data/openssl_enc/hamlet.enc")

// Decrypt
llSuccess = loCrypt.DecryptBd(loFileData)

// Save the decrypted output.
llSuccess = loFileData.WriteFile("qa_output/hamlet_dec.xml")

? "success = " + str(llSuccess)


release loCrypt
release loFileData