Convert encryption / decryption function in PowerShell to PHP (openssl_)

Question

I am trying to adapt the following functions in PowerShell to PHP:

function EncryptDES
{
Param(
    [String] $plainText,
    [byte[]] $Key,
    [byte[]] $Iv
)

    $tdsAlg = New-Object System.Security.Cryptography.DESCryptoServiceProvider
    $tdsAlg.Key = $Key
    $tdsAlg.IV = $Iv
    $encrypt = $tdsAlg.CreateEncryptor($tdsAlg.Key, $tdsAlg.IV)
    $msEncrypt = New-Object System.IO.MemoryStream
    $csEncrypt = New-Object System.Security.Cryptography.CryptoStream $msEncrypt, $encrypt, "Write"
    $swEncrypt = New-Object System.IO.StreamWriter $csEncrypt
    $swEncrypt.Write($plainText)
    $swEncrypt.Close()
    $csEncrypt.Close()
    $msEncrypt.Close()
    $encrypt.Clear()
    $encrypted = $msEncrypt.ToArray()
    $result = [Convert]::ToBase64String($encrypted)
    return $result;        
}

function DecryptDES
{
Param(
    [String] $encrypted,
    [byte[]] $Key,
    [byte[]] $Iv
)
    [byte[]]$NewStr = [System.Convert]::FromBase64String($encrypted)
    $tdsAlg = New-Object System.Security.Cryptography.DESCryptoServiceProvider
    $tdsAlg.Key = $Key
    $tdsAlg.IV = $Iv
    $encrypt = $tdsAlg.CreateDecryptor($tdsAlg.Key, $tdsAlg.IV)
    $msEncrypt = New-Object System.IO.MemoryStream @(,$NewStr)
    $csEncrypt = New-Object System.Security.Cryptography.CryptoStream $msEncrypt, $encrypt, "Read"
    $swEncrypt = New-Object System.IO.StreamReader $csEncrypt
    [String]$result = $swEncrypt.ReadToEnd()
    $swEncrypt.Close()
    $csEncrypt.Close()
    $msEncrypt.Close()
    $encrypt.Clear()

    return $result;     
}

I am trying to convert this code to an equivalent in PHP using the openssl_decrypt and openssl_encrpyt function, I tried with the following code but I do not get anything:

function encrypt_decrypt($action, $string) {
    $output = false;
    $encrypt_method = "AES-256-CBC";
    $secret_key = 'This is my secret key';
    $secret_iv = 'This is my secret iv';
    // hash
    $key = hash('sha256', $secret_key);

    // iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
    $iv = substr(hash('sha256', $secret_iv), 0, 16);
    if ( $action == 'encrypt' ) {
        $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
        $output = base64_encode($output);
    } else if( $action == 'decrypt' ) {
        $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
    }
    return $output;
}

If someone could guide me, I would appreciate your help, thank you

Answer 1

This was the solution that I developed and it works perfect:

<?php
$txt = 'ciphertext';
$key = '12345678';
$iv = '12345678';
$method = 'des-cbc';
// cipher_text
$code = openssl_encrypt($txt, $method, $key, true, $iv);

// ciper_text with base64_encode();
echo base64_encode($code);

// decrypt method
$result = openssl_decrypt($code, $method, $key, 1, $iv);
echo $result;
?>