PHP加密解密实例分析

本文实例讲述了PHP 加密解密方法。分享给大家供大家参考，具体如下：
									//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 = $isEncrypt ? hash('sha1', microtime(true)) : substr($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 ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) ? 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 ? $dynKey . str_replace('=', '', base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);

									}

									echo strlen(dencrypt("12345678912345"));
希望本文所述对大家PHP程序设计有所帮助。
PHP加密解密实例分析

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