PHP custom function to implement string encryption and decryption-PHP Tutorial-php.cn

PHP custom function to implement string encryption and decryption

墨辰丷

Release： 2023-03-29 20:12:02

Original

1914 people have browsed it

This article mainly introduces PHP custom functions to implement string encryption and decryption. Interested friends can refer to it. I hope it will be helpful to everyone.

The code is as follows:

//加密
function string2secret($str)
{
 $key = "123";
 $td = mcrypt_module_open(MCRYPT_DES,&#39;&#39;,&#39;ecb&#39;,&#39;&#39;);
 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
 $ks = mcrypt_enc_get_key_size($td);
 $key = substr(md5($key), 0, $ks);
 mcrypt_generic_init($td, $key, $iv);
 $secret = mcrypt_generic($td, $str);
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return $secret;
}
//解密
function secret2string($sec)
{
 $key = "123";
 $td = mcrypt_module_open(MCRYPT_DES,&#39;&#39;,&#39;ecb&#39;,&#39;&#39;);
 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
 $ks = mcrypt_enc_get_key_size($td);
 $key = substr(md5($key), 0, $ks);
 mcrypt_generic_init($td, $key, $iv);
 $string = mdecrypt_generic($td, $sec);
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return trim($string);
}
echo secret2string(string2secret("11111111111111111"));
//显示结果是11111111111111111
echo &#39;<br>&#39;.string2secret("11111111111111111");
//显示乱码
echo &#39;<br>&#39;;
//$string:要加密的字符串 $isEncrypt=true:加密 $isEncrypt=false:解密
function dencrypt($string, $isEncrypt = true, $key = "KEY_SPACE") {
 if (!isset($string{0}) || !isset($key{0})) {
  return false;
 }
 $dynKey = $isEncrypt ? hash(&#39;sha1&#39;, microtime(true)) : substr($string, 0, 40);
 $fixedKey = hash(&#39;sha1&#39;, $key);
 $dynKeyPart1 = substr($dynKey, 0, 20);
 $dynKeyPart2 = substr($dynKey, 20);
 $fixedKeyPart1 = substr($fixedKey, 0, 20);
 $fixedKeyPart2 = substr($fixedKey, 20);
 $key = hash(&#39;sha1&#39;, $dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2);
 $string = $isEncrypt ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40)));
 $n = 0;
 $result = &#39;&#39;;
 $len = strlen($string);
 for ($n = 0; $n < $len; $n++) {
  $result .= chr(ord($string{$n}) ^ ord($key{$n % 40}));
 }
 return $isEncrypt ? $dynKey . str_replace(&#39;=&#39;, &#39;&#39;, base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);
}
echo strlen(dencrypt("12345678912345"));

Copy after login

Summary: The above is the entire content of this article, I hope it can be helpful to everyone Learning helps.

Related recommendations:

PHP Ajax implements the real-time verification function of verification code

Detailed explanation of PHP encryption and decryption class examples

Detailed explanation of PHP's AES encryption algorithm examples

The above is the detailed content of PHP custom function to implement string encryption and decryption. For more information, please follow other related articles on the PHP Chinese website!