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PHP的加密和解密程序方法

80酷酷网    80kuku.com

  php代码:

以下是引用片段:
<?php 
$key = "This is supposed to be a secret key !!!";  function keyED($txt,$encrypt_key) 

$encrypt_key = md5($encrypt_key); 
$ctr=0; 
$tmp = ""; 
for ($i=0;$i<strlen($txt);$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;$i<strlen($txt);$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;$i<strlen($txt);$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"; 
?> 

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