CryptoJS PHP 통신

<?php

function evpKDF($password, $salt, $keySize = 8, $ivSize = 4, $iterations = 1, $hashAlgorithm = "md5") {
    $targetKeySize = $keySize + $ivSize;
    $derivedBytes = "";
    $numberOfDerivedWords = 0;
    $block = NULL;
    $hasher = hash_init($hashAlgorithm);
    while ($numberOfDerivedWords < $targetKeySize) {
        if ($block != NULL) {
            hash_update($hasher, $block);
        }
        hash_update($hasher, $password);
        hash_update($hasher, $salt);
        $block = hash_final($hasher, TRUE);
        $hasher = hash_init($hashAlgorithm);
        // Iterations
        for ($i = 1; $i < $iterations; $i++) {
            hash_update($hasher, $block);
            $block = hash_final($hasher, TRUE);
            $hasher = hash_init($hashAlgorithm);
        }
        $derivedBytes .= substr($block, 0, min(strlen($block), ($targetKeySize - $numberOfDerivedWords) * 4));
        $numberOfDerivedWords += strlen($block)/4;
    }
    return array(
        "key" => substr($derivedBytes, 0, $keySize * 4),
        "iv"  => substr($derivedBytes, $keySize * 4, $ivSize * 4)
    );
}

function decrypt($ciphertext, $password) {
    $ciphertext = base64_decode($ciphertext);
    if (substr($ciphertext, 0, 8) != "Salted__") {
        return false;
    }
    $salt = substr($ciphertext, 8, 8);
    $keyAndIV = evpKDF($password, $salt);
    $decryptPassword = openssl_decrypt(
        substr($ciphertext, 16),
        "aes-256-cbc",
        $keyAndIV["key"],
        OPENSSL_RAW_DATA, // base64 was already decoded
        $keyAndIV["iv"]);
    return $decryptPassword;
}

$key  =  "secret phrase";
$strg = $_POST['l'];
$rawText = decrypt($strg, $key);
echo "decrypt: " . $rawText;

?>

function encrypt($message, $password) {
    // Generate random salt
    $salt = openssl_random_pseudo_bytes(8);

    // Derive key and IV using the password and salt
    $keyAndIV = evpKDF($password, $salt);

    // Encrypt the message using AES-256-CBC and the derived key and IV
    $encrypted = openssl_encrypt(
        $message,
        "aes-256-cbc",
        $keyAndIV["key"],
        OPENSSL_RAW_DATA,
        $keyAndIV["iv"]
    );

    // Prepend the "Salted__" header and the salt to the encrypted message
    $result = "Salted__" . $salt . $encrypted;

    // Base64-encode the result and return it
    return base64_encode($result);
}