在一些项目中要求在php中生成加密，然后在asp.net中接受过来的密码再解密，下面和大家分享一个PHP与asp.net C#可共用的可逆加密算法，感兴趣的可以参考参考。

php加密算法：

<?php class DES { var $key; var $iv; //偏移量 function DES($key = '11001100', $iv=0 ) { //key长度8例如:1234abcd $this->key = $key; if( $iv == 0 ) { $this->iv = $key; //默认以$key 作为 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，返回大写十六进制字符串 $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程序代码：

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; namespace WindowsFormsApplication1 { /// <summary> /// DES加密解密字符串 /// </summary> public class DesEncryption { /// <summary> /// DES加密字符串 /// </summary> /// <param name="encryptString">待加密的字符串</param> /// <param name="encryptKey">加密密钥,要求为8位</param> /// <returns>加密成功返回加密后的字符串，失败返回null</returns> 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; } } /// <summary> /// DES解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param> /// <returns>解密成功返回解密后的字符串，失败返回null</returns> 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，希望对大家的学习有所帮助。