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$key='123456';

$encrypt=passport_encrypt($str,$key);

$decrypt=passport_decrypt($encrypt,$key);

echo '原文：',$str."<br><hr>";

echo '密文：',$encrypt."<br><hr>";

echo '譯文：',$decrypt."<br><hr>";

DES加密解密函數具體代碼如下：

代碼如下:

<?php

class DES

{

var $key;

var $iv; //偏移量

function DES( $key, $iv=0 ) {

//key長度8例如:1234abcd

$this->key = $key;

if( $iv == 0 ) {

$this->iv = $key;

} else {

$this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );

}

}

function encrypt($str) {

//加密，返回大寫十六進制字符串

$size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );

$str = $this->pkcs5Pad ( $str, $size );

return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );

}

function decrypt($str) {

//解密

$strBin = $this->hex2bin( strtolower( $str ) );

$str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );

$str = $this->pkcs5Unpad( $str );

return $str;

}

function hex2bin($hexData) {

$binData = "";

for($i = 0; $i < strlen ( $hexData ); $i += 2) {

$binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) );

}

return $binData;

}

function pkcs5Pad($text, $blocksize) {

$pad = $blocksize - (strlen ( $text ) % $blocksize);

return $text . str_repeat ( chr ( $pad ), $pad );

}

function pkcs5Unpad($text) {

$pad = ord ( $text {strlen ( $text ) - 1} );

if ($pad > strlen ( $text ))

return false;

if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)

return false;

return substr ( $text, 0, - 1 * $pad );

}

}

?>

以下是測試結果：

代碼如下:

$str = '12345678';

$key = '1234abcd';

$crypt = new DES($key);

$mstr = $crypt->encrypt($str);

$str = $crypt->decrypt($mstr);

echo $str.' <=> '.$mstr;

例子2

代碼如下:

代碼如下:

/**

*加密需通過get方式在url中傳遞的參數

*/

function args_encode($data) {

if(is_array($data)) {

$string = http_build_query($data);

return base64_encode($string);

} else {

return false;

}

}

/**

*獲取url中get方式傳遞的參數

*/

function getargs() {

$string = base64_decode($_GET['args']);

parse_str($string,$g);

return $g;

}