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php5.x版本，要添加php扩展php_mcrypt。
PHP版：
代码如下:class STD3Des
{
private $key = "";
private $iv = ""; /**
* 构造，传递二个已经进行base64_encode的KEY与IV
*
* @param string $key
* @param string $iv
*/
function __construct ($key,$iv)
{
if (empty($key) || empty($iv)) {
echo 'key and iv is not valid';
exit();
}
$this->key = $key;
$this->iv = $iv;
} /**
*加密
* @param $value
* @return
*/
public function encrypt ($value)
{
$td = mcrypt_module_open(MCRYPT_3DES,'',MCRYPT_MODE_CBC,'');
$iv = base64_decode($this->iv);
$value = $this->PaddingPKCS7($value);
$key = base64_decode($this->key);
mcrypt_generic_init($td,$key,$iv);
$ret = base64_encode(mcrypt_generic($td,$value));
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
} /**
*解密
* @param $value
* @return
*/
public function decrypt ($value)
{
$td = mcrypt_module_open(MCRYPT_3DES,'');
$iv = base64_decode($this->iv);
$key = base64_decode($this->key);
mcrypt_generic_init($td,$iv);
$ret = trim(mdecrypt_generic($td,base64_decode($value)));
$ret = $this->UnPaddingPKCS7($ret);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
} private function PaddingPKCS7 ($data)
{
$block_size = mcrypt_get_block_size('tripledes','cbc');
$padding_char = $block_size - (strlen($data) % $block_size);
$data .= str_repeat(chr($padding_char),$padding_char);
return $data;
} private function UnPaddingPKCS7($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,- 1 * $pad);
}
}
//使用
include('STD3Des.class.php');
$key='abcdefgh';
$iv='abcdefgh';
$msg='test string';
$des=new STD3Des(base64_encode($key),base64_encode($iv));
$rs1=$des->encrypt($msg);
echo $rs1.'
';
$rs2=$des->decrypt($rs1);
echo $rs2;
.net版本
代码如下:sealed public class CryptoHelper
{
///
/// Encrypts the specified input.
///
///
///
///
///
public static string DecryptDes(string input,byte[] iv)
{
byte[] buffer;
try { buffer = Convert.FromBase64String(input); }
catch (System.ArgumentNullException) { return String.Empty; }
// length is zero,or not an even multiple of four (plus a few other cases)
catch (System.FormatException) { return String.Empty; } DESCryptoServiceProvider des = new DESCryptoServiceProvider();
MemoryStream ms = null;
CryptoStream encStream = null;
StreamReader sr = null;
string result = String.Empty; try
{
ms = new MemoryStream(buffer); // Create a CryptoStream using the memory stream and the
// CSP DES key.
encStream = new CryptoStream(ms,des.CreateDecryptor(key,CryptoStreamMode.Read); // Create a StreamReader for reading the stream.
sr = new StreamReader(encStream); // Read the stream as a string.
result = sr.ReadToEnd();
}
finally
{
//close objects
if (sr != null)
sr.Close();
if (encStream != null)
encStream.Close();
if (ms != null)
ms.Close();
} return result;
}
}
//调用string key = "abcdefgh";
string iv = "abcdefgh";
string msg="test string";
string rs1 = CryptoHelper.EncryptDes(msg,System.Text.Encoding.ASCII.GetBytes(key),System.Text.Encoding.ASCII.GetBytes(iv));
string rs2 = CryptoHelper.DecryptDes(rs1,System.Text.Encoding.ASCII.GetBytes(iv));
（编辑：安卓应用网）
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