Question

我需要借助一个秘密静态密钥来解密加密的POST值字符串。

我看过crypt（）（但它只是单程）和Mcrypt，GnuPG，......但我对它们不满意。我认为他们应该为我的简单问题复杂化。我该怎么用？我不需要IV形状或超级安全算法。有没有基本的PHP函数，我还不知道呢？

我只需要像这样隐藏用户的图像： ImageJPEG（ImageCreateFromJPEG（decode（$ _ REQUEST ['encryptedImage']，'secret Key'）））;

Answer 1

更新（27/09/17）：

由于mcrypt_encrypt从 PHP 7.1.0 开始已弃用。我使用openssl添加了一个简单的加密/解密。

function encrypt($string, $key = 'PrivateKey', $secret = 'SecretKey', $method = 'AES-256-CBC') {
    // hash
    $key = hash('sha256', $key);
    // create iv - encrypt method AES-256-CBC expects 16 bytes
    $iv = substr(hash('sha256', $secret), 0, 16);
    // encrypt
    $output = openssl_encrypt($string, $method, $key, 0, $iv);
    // encode
    return base64_encode($output);
}

function decrypt($string, $key = 'PrivateKey', $secret = 'SecretKey', $method = 'AES-256-CBC') {
    // hash
    $key = hash('sha256', $key);
    // create iv - encrypt method AES-256-CBC expects 16 bytes
    $iv = substr(hash('sha256', $secret), 0, 16);
    // decode
    $string = base64_decode($string);
    // decrypt
    return openssl_decrypt($string, $method, $key, 0, $iv);
}

$str = 'Encrypt this text';
echo "Plain: " .$str. "\n";

// encrypt
$encrypted_str = encrypt($str);
echo "Encrypted: " .$encrypted_str. "\n";

// decrypt
$decrypted_str = decrypt($encrypted_str);
echo "Decrypted: " .$decrypted_str. "\n";

原始答案：

这样可以变得更简单：（PHP <7.1.0）：

<?php 
define('SECRET',md5('Some secret key'));

function encrypt($value){
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    return mcrypt_encrypt(MCRYPT_RIJNDAEL_256, SECRET, $value, MCRYPT_MODE_ECB, $iv);
}

function decrypt($value){
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, SECRET, $value, MCRYPT_MODE_ECB, $iv));
}

?>

Answer 2

你可以结束内置函数，使它们更友好。与mcrypt_cbc的文档页面上的第二篇用户帖子一样：

<?php
$stuff="String to enc/enc/dec/dec =,=,";
$key="XiTo74dOO09N48YeUmuvbL0E";

function nl() {
    echo "<br/> \n";
}
$iv = mcrypt_create_iv (mcrypt_get_block_size (MCRYPT_TripleDES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM);

// Encrypting
function encrypt($string, $key) {
    $enc = "";
    global $iv;
    $enc=mcrypt_cbc (MCRYPT_TripleDES, $key, $string, MCRYPT_ENCRYPT, $iv);

  return base64_encode($enc);
}

// Decrypting
function decrypt($string, $key) {
    $dec = "";
    $string = trim(base64_decode($string));
    global $iv;
    $dec = mcrypt_cbc (MCRYPT_TripleDES, $key, $string, MCRYPT_DECRYPT, $iv);
  return $dec;
}

$encrypted = encrypt($stuff, $key);
$decrypted = decrypt($encrypted, $key);

echo "Encrypted is ".$encrypted . nl();
echo "Decrypted is ".$decrypted . nl();
?>

Answer 3

这是我所知道的唯一基本内置功能。

$string = "/path/img.jpg";

$scramble = str_rot13($string);

echo "<p>Scrambled: ".$scramble;

echo "<p>Unscrambled: ".str_rot13($scramble);

寻找简单的PHP多路加密方法

3 个答案:

更新（27/09/17）：