6

I have this TRIPLE DES ENCRYPTION CODE IN PHP

    $encryption_key = "CE51E06875F7D964";
    $data='tokenNo=test&securityCode=111' ;
    echo $desEncryptedData = encryptText_3des($data, $encryption_key);//outputs 3des encrypted data

function encryptText_3des($plainText, $key) {
    $key = hash("md5", $key, TRUE); 
    for ($x=0;$x<8;$x++) {
        $key = $key.substr($key, $x, 1);
    }
    $padded = pkcs5_pad($plainText,
        mcrypt_get_block_size(MCRYPT_3DES, MCRYPT_MODE_CBC));
    $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_3DES, $key, $padded, MCRYPT_MODE_CBC));
    return $encrypted;
}
 function pkcs5_pad ($text, $blocksize)   
{
    $pad = $blocksize - (strlen($text) % $blocksize);
    return $text . str_repeat(chr($pad), $pad);
}

Im able to encrypt the data as xcFEvIdLXc2fjhG1i4iPOQu5L6ahxwZVucDOPqeMM2E=

Now I have the key,will I able to decrypt this data to plain text format?

I tried it this way

            $encryption_key = "CE51E06875F7D964";
        $data='xcFEvIdLXc2fjhG1i4iPOQu5L6ahxwZVucDOPqeMM2E=' ; //encrypted data
        echo $desEncryptedData = encryptText_3des($data, $encryption_key);//outputs 3des encrypted data

    function encryptText_3des($plainText, $key) {
        $key = hash("md5", $key, TRUE); 
        for ($x=0;$x<8;$x++) {
            $key = $key.substr($key, $x, 1);
        }
        $padded = pkcs5_unpad($plainText,
            mcrypt_get_block_size(MCRYPT_3DES, MCRYPT_MODE_CBC));
        $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_3DES, $key, $padded, MCRYPT_MODE_CBC));
        return $encrypted;
    }

    function pkcs5_unpad($text)   

    {
        $pad = ord($text{strlen($text)-1});
        if ($pad > strlen($text)) return false;
        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
        return substr($text, 0, -1 * $pad);
    }

But I couldnt do it.IS what I am doing is wrong?Please suggest me a way to decrypt this?Is the encryption key itself is used to decrypt the data in triple DES?Please help

4

4 回答 4

9

对于PHP 7.1及更高版本，不推荐使用mcrypt函数。这是使用openssl_encrypt的替代方法

$ciphertext = openssl_encrypt('string to be encrypted', 'DES-EDE3', 'key', OPENSSL_RAW_DATA);
$ciphertext = base64_encode($ciphertext);

您可以使用此在线三重 DES 加密工具进行交叉检查。

对于其他可用的密码，您可以调用 PHP 方法openssl_get_cipher_methods()

于 2019-08-16T02:27:19.827 回答
8

这是解决方案：

public function encrypt($data, $secret)
{
    //Generate a key from a hash
    $key = md5(utf8_encode($secret), true);

    //Take first 8 bytes of $key and append them to the end of $key.
    $key .= substr($key, 0, 8);

    //Pad for PKCS7
    $blockSize = mcrypt_get_block_size('tripledes', 'ecb');
    $len = strlen($data);
    $pad = $blockSize - ($len % $blockSize);
    $data .= str_repeat(chr($pad), $pad);

    //Encrypt data
    $encData = mcrypt_encrypt('tripledes', $key, $data, 'ecb');

    return base64_encode($encData);
}

public function decrypt($data, $secret)
{
    //Generate a key from a hash
    $key = md5(utf8_encode($secret), true);

    //Take first 8 bytes of $key and append them to the end of $key.
    $key .= substr($key, 0, 8);

    $data = base64_decode($data);

    $data = mcrypt_decrypt('tripledes', $key, $data, 'ecb');

    $block = mcrypt_get_block_size('tripledes', 'ecb');
    $len = strlen($data);
    $pad = ord($data[$len-1]);

    return substr($data, 0, strlen($data) - $pad);
}

问候。

于 2015-01-28T15:19:39.363 回答
6

https://github.com/iam-raihan96/3DES-ECB-Cryptography-in-PHP

在这里，我用PHP编写了3DES-ECB密码学。在那里你会得到两个类文件“ Crypt_mcrypt ”使用“ mcrypt ”和“ Crypt_openssl ”使用“openssl”。所以你可以使用它们中的任何一个，但它是

强烈推荐使用“Crypt_openssl”

如果您在代码中输入 mcrypt 这个词，您可能会犯错误。尽管可以提供一个建立在 mcrypt 之上的相对安全的密码库（defuse/php-encryption的早期版本），但将代码切换到 openssl 将提供更好的安全性、性能、可维护性和可移植性。更好的是：改用 libsodium。

于 2017-07-09T23:50:32.853 回答
0

嘿@black buddy，解密功能很完美，问题是您需要通过加密功能传递加密数据。

<?php 
  $encryption_key = "CE51E06875F7D964";
  $data='tokenNo=test&securityCode=111' ;
  // the below will return the encoded data you need to put the value in the variable $asl.
  echo encrypt($data,$encryption_key);
  function encrypt($data, $secret)
  {
    //Generate a key from a hash
    $key = md5(utf8_encode($secret), true);

     //Take first 8 bytes of $key and append them to the end of $key.
    $key .= substr($key, 0, 8);
    //Pad for PKCS7
    $blockSize = mcrypt_get_block_size('tripledes', 'ecb');
    $len = strlen($data);
    $pad = $blockSize - ($len % $blockSize);
    $data .= str_repeat(chr($pad), $pad);

    //Encrypt data
    $encData = mcrypt_encrypt('tripledes', $key, $data, 'ecb');

    return base64_encode($encData);
  }

  //the below is the encryption of $data = 'token.....' which there above 
  $asl = 'xcFEvIdLXc0LX+lk46iIFY09GF+FL+SWM0PTNw669VE=';
  // this echo will provide you the $data which is there in the begining
  echo decrypt($asl , $encryption_key);

  function decrypt($data, $secret)
  {
    //Generate a key from a hash
    $key = md5(utf8_encode($secret), true);

    //Take first 8 bytes of $key and append them to the end of $key.
    $key .= substr($key, 0, 8);

    $data = base64_decode($data);

    $data = mcrypt_decrypt('tripledes', $key, $data, 'ecb');

    $block = mcrypt_get_block_size('tripledes', 'ecb');
    $len = strlen($data);
    $pad = ord($data[$len-1]);

    return substr($data, 0, strlen($data) - $pad);
  }

?>
于 2017-11-03T14:56:31.163 回答