PHP7 OpenSSL DES-EDE-CBC encryption and decryption

1. Conditional constraints

The mcrypt library commonly used on PHP5 has been removed on PHP7.1, so we use openssl to encrypt and decrypt data.

The encryption method adopts DES-EDE-CBC method.

The key filling method is: using a 24-bit key, first perform MD5 verification on the key to obtain a 16-bit string, and then take the first 8 digits of the key MD5 verification value and append them to the previous value. value behind. A 24-bit key is assembled from this.

2. Code sharing

<?php
class DesEdeCbc {
private $cipher, $key, $iv;
/**
 * DesEdeCbc constructor.
 * @param $cipher
 * @param $key
 * @param $iv
 */
public function __construct($cipher, $key, $iv) {
$this->cipher = $cipher;
$this->key= $this->getFormatKey($key);
$this->iv = $iv;
}
/**
 * @func  加密
 * @param $msg
 * @return string
 */
public function encrypt($msg) {
$des = @openssl_encrypt($msg, $this->cipher, $this->key, OPENSSL_RAW_DATA, $this->iv);
return base64_encode($des);
}
/**
 * @func  解密
 * @param $msg
 * @return string
 */
public function decrypt($msg) {
return @openssl_decrypt(base64_decode($msg), $this->cipher, $this->key, OPENSSL_RAW_DATA, $this->iv);
}
/**
 * @func  生成24位长度的key
 * @param $skey
 * @return bool|string
 */
private function getFormatKey($skey) {
$md5Value= md5($skey);
$md5ValueLen = strlen($md5Value);
$key = $md5Value . substr($md5Value, 0, $md5ValueLen / 2);
return hex2bin($key);
}
}
$cipher = &#39;DES-EDE-CBC&#39;;
$msg = &#39;HelloWorld&#39;;
$key = &#39;12345678&#39;;
$iv  = "\x00\x00\x00\x00\x00\x00\x00\x00";
$des = new DesEdeCbc($cipher, $key, $iv);
// 加密
$msg = $des->encrypt($msg);
echo &#39;加密后: &#39; . $msg . PHP_EOL;
// 解密
$src = $des->decrypt($msg);
echo &#39;解密后: &#39; . $src . PHP_EOL;

3. A little explanation

You can adjust the encryption method and key filling according to the actual situation methods, and iv vectors to meet different needs.

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