(PHP Extension) 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.

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<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$crypt = new CkCrypt2();

// Use aes-256-cbc
$crypt->put_CryptAlgorithm('aes');
$crypt->put_CipherMode('cbc');
$crypt->put_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:
$crypt->put_HashAlgorithm('sha256');

// This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
$crypt->put_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:
$crypt->SetSecretKeyViaPassword('secret');

// Load the file to be decrypted.
$fileData = new CkBinData();
$success = $fileData->LoadFile('qa_data/openssl_enc/hamlet.enc');

// Decrypt
$success = $crypt->DecryptBd($fileData);

// Save the decrypted output.
$success = $fileData->WriteFile('qa_output/hamlet_dec.xml');

print 'success = ' . $success . "\n";

?>