在一些項目中要求在php中生成加密，然后在asp.net中接受過來的密碼再解密，下面和大家分享一個PHP與asp.net C#可共用的可逆加密算法，感興趣的可以參考參考。

php加密算法：

class DES

{

var $key;

var $iv; //偏移量

function DES($key = '11001100', $iv=0 ) {

//key長度8例如:1234abcd

$this->key = $key;

if( $iv == 0 ) {

$this->iv = $key; //默認以$key 作為 iv

} 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 );

}

}

?>

asp.net程序代碼：

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

namespace WindowsFormsApplication1

{

///

/// DES加密解密字符串

///

public class DesEncryption

{

///

/// DES加密字符串

///

/// 待加密的字符串

/// 加密密鑰,要求為8位

/// 加密成功返回加密后的字符串，失敗返回null

public static string EncryptDES(string encryptString, string encryptKey = "11001100")

{

try

{

byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(encryptKey.Substring(0, 8));

byte[] rgbIV = rgbKey;

byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);

DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();

MemoryStream mStream = new MemoryStream();

CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

cStream.Write(inputByteArray, 0, inputByteArray.Length);

cStream.FlushFinalBlock();

StringBuilder ret = new StringBuilder();

foreach (byte b in mStream.ToArray())

{

ret.AppendFormat("{0:X2}", b);

}

ret.ToString();

return ret.ToString();

}

catch

{

return null;

}

}

///

/// DES解密字符串

///

/// 待解密的字符串

/// 解密密鑰,要求為8位,和加密密鑰相同

/// 解密成功返回解密后的字符串，失敗返回null

public static string DecryptDES(string decryptString, string decryptKey = "11001100")

{

try

{

byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(decryptKey);

byte[] rgbIV = rgbKey;

byte[] inputByteArray = new byte[decryptString.Length / 2];

for (int x = 0; x < decryptString.Length / 2; x++)

{

int i = (Convert.ToInt32(decryptString.Substring(x * 2, 2), 16));

inputByteArray[x] = (byte)i;

}

DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();

MemoryStream mStream = new MemoryStream();

CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

cStream.Write(inputByteArray, 0, inputByteArray.Length);

cStream.FlushFinalBlock();

return Encoding.UTF8.GetString(mStream.ToArray());

}

catch

{

return null;

}

}

}

}

以上就是PHP和C#可共用的可逆加密算法，希望對大家的學習有所幫助。

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