关于des加密与解密实现方法(php net两个版本)

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发布： 2016-07-25 09:04:25

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/**
des 加密解密
*/
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, '', MCRYPT_MODE_CBC, '');
$iv = base64_decode($this->iv);
$key = base64_decode($this->key);
mcrypt_generic_init($td, $key, $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, 0, - 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;

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2、.net版本

//des 加密解密
sealed public class CryptoHelper
{
///
/// Encrypts the specified input.

///
/// The input.
/// key
/// iv
///
public static string EncryptDes(string input, byte[] key, byte[] iv)
{
if (input == null || input.Length == 0)
return String.Empty;
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
MemoryStream ms = null;
CryptoStream encStream = null;
StreamWriter sw = null;
string result = String.Empty;
try
{
ms = new MemoryStream();
// Create a CryptoStream using the memory stream and the
// CSP DES key.
//des.Mode = CipherMode.CBC;
//des.Padding = PaddingMode.PKCS7;
encStream = new CryptoStream(ms, des.CreateEncryptor(key, iv), CryptoStreamMode.Write);
// Create a StreamWriter to write a string
// to the stream.
sw = new StreamWriter(encStream);
// Write the plaintext to the stream.
sw.Write(input);
sw.Flush();
encStream.FlushFinalBlock();
ms.Flush();
result = Convert.ToBase64String(ms.GetBuffer(), 0, Convert.ToInt32(ms.Length, CultureInfo.InvariantCulture));
}
finally
{
//close objects
if (sw != null)
sw.Close();
if (encStream != null)
encStream.Close();
if (ms != null)
ms.Close();
}
// Return the encrypted string
return result;
}
///
/// Decrypts the specified input.

///
/// the input.
/// key
/// iv
///
public static string DecryptDes(string input, byte[] key, 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, iv), 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(key), System.Text.Encoding.ASCII.GetBytes(iv));

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