如何使用php加密/解密文件中的文本？

Question

如何使用php加密/解密文件中的文本？

Answer 1

如果您使用PHP编译了mcrypt模块:

function encryptData($value){
   $key = "top secret key";
   $text = $value;
   $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
   $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
   $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
   return $crypttext;
}

function decryptData($value){
   $key = "top secret key";
   $crypttext = $value;
   $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
   $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
   $decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $crypttext, MCRYPT_MODE_ECB, $iv);
   return trim($decrypttext);
} 

$filename = "/usr/local/something.txt";
$handle = fopen($filename, "r");
$contents = fread($handle, filesize($filename));


$EncryptedData=encryptData($content);
$DecryptedData=decryptData($EncryptedData);

有关详细信息,请参阅http://us3.php.net/manual/en/function.mcrypt-encrypt.php.(来自同一来源的代码段)