(PHP Extension) Encrypt / Decrypt a File and Verify it has not Changed

Demonstrates how to encrypt and decrypt a file, and verify it has not changed.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux

<?php

include("chilkat.php");
// Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0

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

$crypt = new CkCrypt2();

$crypt->put_CryptAlgorithm('aes');
$crypt->put_CipherMode('cbc');
$crypt->put_KeyLength(128);
$crypt->put_PaddingScheme(0);

$ivHex = '000102030405060708090A0B0C0D0E0F';
$crypt->SetEncodedIV($ivHex,'hex');

$keyHex = '00010203040506071011121314151617';
$crypt->SetEncodedKey($keyHex,'hex');

$dataFile = 'qa_data/zips/HBIQ040615300005.ZIP';
$outFile = 'qa_output/HBIQ040615300005.enc';
$outFile2 = 'qa_output/HBIQ040615300005.ZIP';

$success = $crypt->CkEncryptFile($dataFile,$outFile);
$success = $crypt->CkDecryptFile($outFile,$outFile2);

$fac = new CkFileAccess();
$bEqual = $fac->FileContentsEqual($dataFile,$outFile2);
if ($bEqual != true) {
    print 'Decrypted file not equal to the original.' . "\n";
}
else {
    print 'Success.' . "\n";
}


?>