PHP encryption and decryption example analysis, _PHP tutorial

PHP encryption and decryption example analysis,

The example in this article describes the PHP encryption and decryption method. Share it with everyone for your reference, the details are as follows:

//加密
function string2secret($str)
{
 $key = "123";
 $td = mcrypt_module_open(MCRYPT_DES,'','ecb','');
 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($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,'','ecb','');
 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($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 '<br>'.string2secret("11111111111111111");
//显示乱码
echo '<br>';
//$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 = $isEncrypt &#63; hash('sha1', microtime(true)) : substr($string, 0, 40);
 $fixedKey = hash('sha1', $key);
 $dynKeyPart1 = substr($dynKey, 0, 20);
 $dynKeyPart2 = substr($dynKey, 20);
 $fixedKeyPart1 = substr($fixedKey, 0, 20);
 $fixedKeyPart2 = substr($fixedKey, 20);
 $key = hash('sha1', $dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2);
 $string = $isEncrypt &#63; $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) &#63; gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40)));
 $n = 0;
 $result = '';
 $len = strlen($string);
 for ($n = 0; $n < $len; $n++) {
  $result .= chr(ord($string{$n}) ^ ord($key{$n % 40}));
 }
 return $isEncrypt &#63; $dynKey . str_replace('=', '', base64_encode($n > 299 &#63; gzcompress($result) : $result)) : substr($result, 20, -20);
}
echo strlen(dencrypt("12345678912345"));

I hope this article will be helpful to everyone in PHP programming.

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