PHP7中如何使用“DES-EDE-CBC”加解密

<?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 = 'DES-EDE-CBC';
$msg = 'HelloWorld';
$key = '12345678';
$iv  = "\x00\x00\x00\x00\x00\x00\x00\x00";

$des = new DesEdeCbc($cipher, $key, $iv);

// 加密
$msg = $des->encrypt($msg);
echo '加密后: ' . $msg . PHP_EOL;

// 解密
$src = $des->decrypt($msg);
echo '解密后: ' . $src . PHP_EOL;