$key = "This is supposed to be a secret key !!!";function keyED($txt,$encrypt_key){$encrypt_key = md5($encrypt_key);$ctr=0;$tmp = "";for ($i=0;$i{if ($ctr==strlen($encrypt_key)) $ctr=0;$tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);$ctr ;}return $tmp;}function encrypt($txt,$key){srand((double)microtime()*1000000);$encrypt_key = md5(rand(0,32000));$ctr=0;$tmp = "";for ($i=0;$i{if ($ctr==strlen($encrypt_key)) $ctr=0;$tmp.= substr($encrypt_key,$ctr,1) .(substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));$ctr ;}return keyED($tmp,$key);}function decrypt($txt,$key){$txt = keyED($txt,$key);$tmp = "";for ($i=0;$i{$md5 = substr($txt,$i,1);$i ;$tmp.= (substr($txt,$i,1) ^ $md5);}return $tmp;}$string = "Hello World !!!";// encrypt $string, and store it in $enc_text$enc_text = encrypt($string,$key);// decrypt the encrypted text $enc_text, and store it in $dec_text$dec_text = decrypt($enc_text,$key);print "Original text : $string\n";print "Encrypted text : $enc_text\n";print "Decrypted text : $dec_text\n";?>
一段php加密解密的代码_PHP
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