PHP使用自定义key实现对数据加密解密的方法（php使用自定义key实现对数据加密解密的方法是）

25-02-26 21

此处将为大家介绍关于PHP使用自定义key实现对数据加密解密的方法的详细内容，并且为您解答有关php使用自定义key实现对数据加密解密的方法是的相关问题，此外，我们还将为您介绍关于.NET使用RSA加

此处将为大家介绍关于PHP使用自定义key实现对数据加密解密的方法的详细内容，并且为您解答有关php使用自定义key实现对数据加密解密的方法是的相关问题，此外，我们还将为您介绍关于.NET使用RSA加密解密的方法、base64加密解密一段php加密解密的代码、C#实现对AES加密和解密的方法、C#实现对文件进行加密解密的方法的有用信息。

本文目录一览：

PHP使用自定义key实现对数据加密解密的方法（php使用自定义key实现对数据加密解密的方法是）
.NET使用RSA加密解密的方法
base64加密解密一段php加密解密的代码
C#实现对AES加密和解密的方法
C#实现对文件进行加密解密的方法

PHP使用自定义key实现对数据加密解密的方法（php使用自定义key实现对数据加密解密的方法是）

本文实例讲述了PHP使用自定义key实现对数据加密解密的方法。分享给大家供大家参考，具体如下：

客户端和服务端通信时，有个场景很常见，通过一个id作为url参数来回传递。假设现在业务上只有这个id标识，那么需要稍微安全一点的通信，对这个id进行加密传输，到服务端再进行解密。这里需要一个服务端进行保密的key，利用这个key进行加密和解密。

加解密的方法如下：$str是需要加解密的字符串，$key是自己定义的一个key

// 加密
function encryptStr($str, $key){
  $block = mcrypt_get_block_size(''des'', ''ecb'');
  $pad = $block - (strlen($str) % $block);
  $str .= str_repeat(chr($pad), $pad);
  $enc_str = mcrypt_encrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
  return base64_encode($enc_str);
}
// 解密
function decryptStr($str, $key){
  $str = base64_decode($str);
  $str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
  $block = mcrypt_get_block_size(''des'', ''ecb'');
  $pad = ord($str[($len = strlen($str)) - 1]);
  return substr($str, 0, strlen($str) - $pad);
}

值得一提的是：

如果说应用到url中id的这个场景，那么加密过后，是base64的编码，建议再urlencode()下，去除+号的影响。

PS：关于加密解密感兴趣的朋友还可以参考本站在线工具：

文字在线加密解密工具（包含AES、DES、RC4等）：
http://tools.jb51.net/password/txt_encode

MD5在线加密工具:
http://tools.jb51.net/password/CreateMD5Password

在线散列/哈希算法加密工具:
http://tools.jb51.net/password/hash_encrypt

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：
http://tools.jb51.net/password/hash_md5_sha

在线sha1/sha224/sha256/sha384/sha512加密工具：
http://tools.jb51.net/password/sha_encode

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php加密方法总结》、《PHP编码与转码操作技巧汇总》、《PHP数学运算技巧总结》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》、《PHP数据结构与算法教程》、《php程序设计算法总结》及《php正则表达式用法总结》

希望本文所述对大家PHP程序设计有所帮助。

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.NET使用RSA加密解密的方法

本文实例为大家分享了.NET使用RSA加密解密的具体代码，供大家参考，具体内容如下

PassWordHelper.cs代码:

using System;
using System.IO;
using System.Text;
using System.Globalization;
using System.Collections.Generic;
using System.Security.Cryptography;

namespace Utils
{
  /// <summary>
  /// 密码加密解密操作相关类
  /// </summary>
  public static class PassWordHelper
  {
    #region MD5 加密

    /// <summary>
    /// MD5加密
    /// </summary>
    public static string Md532(this string source)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      MD5 md5 = MD5.Create();
      return HashAlgorithmBase(md5, source, encoding);
    }

    /// <summary>
    /// 加盐MD5加密
    /// </summary>
    public static string Md532Salt(this string source, string salt)
    {
      return string.IsNullOrEmpty(source) ? source.Md532() : (source + "『" + salt + "』").Md532();
    }

    #endregion

    #region SHA 加密

    /// <summary>
    /// SHA1 加密
    /// </summary>
    public static string Sha1(this string source)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      SHA1 sha1 = new SHA1CryptoServiceProvider();
      return HashAlgorithmBase(sha1, source, encoding);
    }

    /// <summary>
    /// SHA256 加密
    /// </summary>
    public static string Sha256(this string source)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      SHA256 sha256 = new SHA256Managed();
      return HashAlgorithmBase(sha256, source, encoding);
    }

    /// <summary>
    /// SHA512 加密
    /// </summary>
    public static string Sha512(this string source)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      SHA512 sha512 = new SHA512Managed();
      return HashAlgorithmBase(sha512, source, encoding);
    }

    #endregion

    #region HMAC 加密

    /// <summary>
    /// HmacSha1 加密
    /// </summary>
    public static string HmacSha1(this string source, string keyVal)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      byte[] keyStr = encoding.GetBytes(keyVal);
      HMACSHA1 hmacSha1 = new HMACSHA1(keyStr);
      return HashAlgorithmBase(hmacSha1, source, encoding);
    }

    /// <summary>
    /// HmacSha256 加密
    /// </summary>
    public static string HmacSha256(this string source, string keyVal)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      byte[] keyStr = encoding.GetBytes(keyVal);
      HMACSHA256 hmacSha256 = new HMACSHA256(keyStr);
      return HashAlgorithmBase(hmacSha256, source, encoding);
    }

    /// <summary>
    /// HmacSha384 加密
    /// </summary>
    public static string HmacSha384(this string source, string keyVal)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      byte[] keyStr = encoding.GetBytes(keyVal);
      HMACSHA384 hmacSha384 = new HMACSHA384(keyStr);
      return HashAlgorithmBase(hmacSha384, source, encoding);
    }

    /// <summary>
    /// HmacSha512 加密
    /// </summary>
    public static string HmacSha512(this string source, string keyVal)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      byte[] keyStr = encoding.GetBytes(keyVal);
      HMACSHA512 hmacSha512 = new HMACSHA512(keyStr);
      return HashAlgorithmBase(hmacSha512, source, encoding);
    }

    /// <summary>
    /// HmacMd5 加密
    /// </summary>
    public static string HmacMd5(this string source, string keyVal)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      byte[] keyStr = encoding.GetBytes(keyVal);
      HMACMD5 hmacMd5 = new HMACMD5(keyStr);
      return HashAlgorithmBase(hmacMd5, source, encoding);
    }

    /// <summary>
    /// HmacRipeMd160 加密
    /// </summary>
    public static string HmacRipeMd160(this string source, string keyVal)
    {
      if (string.IsNullOrEmpty(source)) return null;
      var encoding = Encoding.UTF8;
      byte[] keyStr = encoding.GetBytes(keyVal);
      HMACRIPEMD160 hmacRipeMd160 = new HMACRIPEMD160(keyStr);
      return HashAlgorithmBase(hmacRipeMd160, source, encoding);
    }

    #endregion

    #region AES 加密解密

    /// <summary> 
    /// AES加密 
    /// </summary> 
    /// <param name="source">待加密字段</param> 
    /// <param name="keyVal">密钥值</param> 
    /// <param name="ivVal">加密辅助向量</param> 
    /// <returns></returns> 
    public static string AesStr(this string source, string keyVal, string ivVal)
    {
      var encoding = Encoding.UTF8;
      byte[] btKey = keyVal.FormatByte(encoding);
      byte[] btIv = ivVal.FormatByte(encoding);
      byte[] byteArray = encoding.GetBytes(source);
      string encrypt;
      Rijndael aes = Rijndael.Create();
      using (MemoryStream mStream = new MemoryStream())
      {
        using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(btKey, btIv), CryptoStreamMode.Write))
        {
          cStream.Write(byteArray, 0, byteArray.Length);
          cStream.FlushFinalBlock();
          encrypt = Convert.ToBase64String(mStream.ToArray());
        }
      }
      aes.Clear();
      return encrypt;
    }

    /// <summary> 
    /// AES解密 
    /// </summary> 
    /// <param name="source">待加密字段</param> 
    /// <param name="keyVal">密钥值</param> 
    /// <param name="ivVal">加密辅助向量</param> 
    /// <returns></returns> 
    public static string UnAesStr(this string source, string keyVal, string ivVal)
    {
      var encoding = Encoding.UTF8;
      byte[] btKey = keyVal.FormatByte(encoding);
      byte[] btIv = ivVal.FormatByte(encoding);
      byte[] byteArray = Convert.FromBase64String(source);
      string decrypt;
      Rijndael aes = Rijndael.Create();
      using (MemoryStream mStream = new MemoryStream())
      {
        using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(btKey, btIv), CryptoStreamMode.Write))
        {
          cStream.Write(byteArray, 0, byteArray.Length);
          cStream.FlushFinalBlock();
          decrypt = encoding.GetString(mStream.ToArray());
        }
      }
      aes.Clear();
      return decrypt;
    }

    /// <summary> 
    /// AES Byte类型 加密 
    /// </summary> 
    /// <param name="data">待加密明文</param> 
    /// <param name="keyVal">密钥值</param> 
    /// <param name="ivVal">加密辅助向量</param> 
    /// <returns></returns> 
    public static byte[] AesByte(this byte[] data, string keyVal, string ivVal)
    {
      byte[] bKey = new byte[32];
      Array.Copy(Encoding.UTF8.GetBytes(keyVal.PadRight(bKey.Length)), bKey, bKey.Length);
      byte[] bVector = new byte[16];
      Array.Copy(Encoding.UTF8.GetBytes(ivVal.PadRight(bVector.Length)), bVector, bVector.Length);
      byte[] cryptograph;
      Rijndael aes = Rijndael.Create();
      try
      {
        using (MemoryStream mStream = new MemoryStream())
        {
          using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bVector), CryptoStreamMode.Write))
          {
            cStream.Write(data, 0, data.Length);
            cStream.FlushFinalBlock();
            cryptograph = mStream.ToArray();
          }
        }
      }
      catch
      {
        cryptograph = null;
      }
      return cryptograph;
    }

    /// <summary> 
    /// AES Byte类型 解密 
    /// </summary> 
    /// <param name="data">待解密明文</param> 
    /// <param name="keyVal">密钥值</param> 
    /// <param name="ivVal">加密辅助向量</param> 
    /// <returns></returns> 
    public static byte[] UnAesByte(this byte[] data, string keyVal, string ivVal)
    {
      byte[] bKey = new byte[32];
      Array.Copy(Encoding.UTF8.GetBytes(keyVal.PadRight(bKey.Length)), bKey, bKey.Length);
      byte[] bVector = new byte[16];
      Array.Copy(Encoding.UTF8.GetBytes(ivVal.PadRight(bVector.Length)), bVector, bVector.Length);
      byte[] original;
      Rijndael aes = Rijndael.Create();
      try
      {
        using (MemoryStream mStream = new MemoryStream(data))
        {
          using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bVector), CryptoStreamMode.Read))
          {
            using (MemoryStream originalMemory = new MemoryStream())
            {
              byte[] buffer = new byte[1024];
              int readBytes;
              while ((readBytes = cStream.Read(buffer, 0, buffer.Length)) > 0)
              {
                originalMemory.Write(buffer, 0, readBytes);
              }

              original = originalMemory.ToArray();
            }
          }
        }
      }
      catch
      {
        original = null;
      }
      return original;
    }

    #endregion

    #region RSA 加密解密

    //密钥对，请配合密钥生成工具使用『 http://download.csdn.net/detail/downiis6/9464639 』
    private const string PublicRsaKey = @"<RSAKeyValue>
 <Modulus>8Yvf/LjXRhCuOREk2CuSYvbD/RadwJ4sjHREIpQVKwkTlG3BtRgpnaMcoeLAesmwvpBWnqK4hBkYLxhRj+NEKnlGrJ+LkNMnZr0/4CMuulZFAnx7iQYaSq7Eh7kBKGLofc05CjZguYpnPNxHIv4VNx+a9tIh+hnhjrmkJLUm3l0=</Modulus>
 <Exponent>AQAB</Exponent>
</RSAKeyValue>";
    private const string PrivateRsaKey = @"<RSAKeyValue>
 <Modulus>8Yvf/LjXRhCuOREk2CuSYvbD/RadwJ4sjHREIpQVKwkTlG3BtRgpnaMcoeLAesmwvpBWnqK4hBkYLxhRj+NEKnlGrJ+LkNMnZr0/4CMuulZFAnx7iQYaSq7Eh7kBKGLofc05CjZguYpnPNxHIv4VNx+a9tIh+hnhjrmkJLUm3l0=</Modulus>
 <Exponent>AQAB</Exponent>
 <P>/xAaa/4dtDxcEAk5koSZBPjuxqvKJikpwLA1nCm3xxAUMDVxSwQyr+SHFaCnBN9kqaNkQCY6kDCfJXFWPOj0Bw==</P>
 <Q>8m8PFVA4sO0oEKMVQxt+ivDTHFuk/W154UL3IgC9Y6bzlvYewXZSzZHmxZXXM1lFtwoYG/k+focXBITsiJepew==</Q>
 <DP>ONVSvdt6rO2CKgSUMoSfQA9jzRr8STKE3i2lVG2rSIzZosBVxTxjOvQ18WjBroFEgdQpg23BQN3EqGgvqhTSQw==</DP>
 <DQ>gfp7SsEM9AbioTDemHEoQlPly+FyrxE/9D8UAt4ErGX5WamxSaYntOGRqcOxcm1djEpULMNP90R0Wc7uhjlR+w==</DQ>
 <InverseQ>C0eBsp2iMOxWwKo+EzkHOP0H+YOitUVgjekGXmSt9a3TvikQNaJ5ATlqKsZaMGsnB6UIHei+kUaCusVX0HgQ2A==</InverseQ>
 <D>tPYxEfo9Nb3LeO+SJe3G1yO+w37NIwCdqYB1h15f2YUMSThNVmpKy1HnYpUp1RQDuVETw/duu3C9gJL8kAsZBjBrVZ0zC/JZsgvSNprfUK3Asc4FgFsGfQGKW1nvvgdMbvqr4ClB0R8czkki+f9Oc5ea/RMqXxlI+XjzMYDEknU=</D>
</RSAKeyValue>";

    /// <summary>
    /// RSA 加密
    /// </summary>
    public static string Rsa(this string source)
    {
      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
      rsa.FromXmlString(PublicRsaKey);
      var cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(source), true);
      return Convert.ToBase64String(cipherbytes);
    }

    /// <summary>
    /// RSA解密
    /// </summary>
    public static string UnRsa(this string source)
    {
      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
      rsa.FromXmlString(PrivateRsaKey);
      var cipherbytes = rsa.Decrypt(Convert.FromBase64String(source), true);
      return Encoding.UTF8.GetString(cipherbytes);
    }

    #endregion

    #region DES 加密解密

    /// <summary>
    /// DES 加密
    /// </summary>
    public static string Des(this string source, string keyVal, string ivVal)
    {
      try
      {
        byte[] data = Encoding.UTF8.GetBytes(source);
        var des = new DESCryptoServiceProvider { Key = Encoding.ASCII.GetBytes(keyVal.Length > 8 ? keyVal.Substring(0, 8) : keyVal), IV = Encoding.ASCII.GetBytes(ivVal.Length > 8 ? ivVal.Substring(0, 8) : ivVal) };
        var desencrypt = des.CreateEncryptor();
        byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
        return BitConverter.ToString(result);
      }
      catch { return "转换出错！"; }
    }

    /// <summary>
    /// DES 解密
    /// </summary>
    public static string UnDes(this string source, string keyVal, string ivVal)
    {
      try
      {
        string[] sInput = source.Split("-".ToCharArray());
        byte[] data = new byte[sInput.Length];
        for (int i = 0; i < sInput.Length; i++)
        {
          data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
        }
        var des = new DESCryptoServiceProvider { Key = Encoding.ASCII.GetBytes(keyVal.Length > 8 ? keyVal.Substring(0, 8) : keyVal), IV = Encoding.ASCII.GetBytes(ivVal.Length > 8 ? ivVal.Substring(0, 8) : ivVal) };
        var desencrypt = des.CreateDecryptor();
        byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
        return Encoding.UTF8.GetString(result);
      }
      catch { return "解密出错！"; }
    }

    #endregion

    #region TripleDES 加密解密

    /// <summary>
    /// DES3 加密
    /// </summary>
    public static string Des3(this string source, string keyVal)
    {
      try
      {
        TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider
        {
          Key = keyVal.FormatByte(Encoding.UTF8),
          Mode = CipherMode.ECB,
          Padding = PaddingMode.PKCS7
        };
        using (MemoryStream ms = new MemoryStream())
        {
          byte[] btArray = Encoding.UTF8.GetBytes(source);
          try
          {
            using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
            {
              cs.Write(btArray, 0, btArray.Length);
              cs.FlushFinalBlock();
            }
            return ms.ToArray().Bytes2Str();
          }
          catch { return source; }
        }
      }
      catch
      {
        return "TripleDES加密出现错误";
      }
    }

    /// <summary>
    /// DES3 解密
    /// </summary>
    public static string UnDes3(this string source, string keyVal)
    {
      try
      {
        byte[] byArray = source.Str2Bytes();
        TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider
        {
          Key = keyVal.FormatByte(Encoding.UTF8),
          Mode = CipherMode.ECB,
          Padding = PaddingMode.PKCS7
        };
        using (MemoryStream ms = new MemoryStream())
        {
          using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
          {
            cs.Write(byArray, 0, byArray.Length);
            cs.FlushFinalBlock();
            cs.Close();
            ms.Close();
            return Encoding.UTF8.GetString(ms.ToArray());
          }
        }
      }
      catch
      {
        return "TripleDES解密出现错误";
      }
    }

    #endregion

    #region BASE64 加密解密

    /// <summary>
    /// BASE64 加密
    /// </summary>
    /// <param name="source">待加密字段</param>
    /// <returns></returns>
    public static string Base64(this string source)
    {
      var btArray = Encoding.UTF8.GetBytes(source);
      return Convert.ToBase64String(btArray, 0, btArray.Length);
    }

    /// <summary>
    /// BASE64 解密
    /// </summary>
    /// <param name="source">待解密字段</param>
    /// <returns></returns>
    public static string UnBase64(this string source)
    {
      var btArray = Convert.FromBase64String(source);
      return Encoding.UTF8.GetString(btArray);
    }

    #endregion

    #region 内部方法

    /// <summary>
    /// 转成数组
    /// </summary>
    private static byte[] Str2Bytes(this string source)
    {
      source = source.Replace(" ", "");
      byte[] buffer = new byte[source.Length / 2];
      for (int i = 0; i < source.Length; i += 2) buffer[i / 2] = Convert.ToByte(source.Substring(i, 2), 16);
      return buffer;
    }

    /// <summary>
    /// 转换成字符串
    /// </summary>
    private static string Bytes2Str(this IEnumerable<byte> source, string formatStr = "{0:X2}")
    {
      StringBuilder pwd = new StringBuilder();
      foreach (byte btStr in source) { pwd.AppendFormat(formatStr, btStr); }
      return pwd.ToString();
    }

    private static byte[] FormatByte(this string strVal, Encoding encoding)
    {
      return encoding.GetBytes(strVal.Base64().Substring(0, 16).ToUpper());
    }

    /// <summary>
    /// HashAlgorithm 加密统一方法
    /// </summary>
    private static string HashAlgorithmBase(HashAlgorithm hashAlgorithmObj, string source, Encoding encoding)
    {
      byte[] btStr = encoding.GetBytes(source);
      byte[] hashStr = hashAlgorithmObj.ComputeHash(btStr);
      return hashStr.Bytes2Str();
    }

    #endregion
  }
}

Program.cs代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Test
{
  class Program
  {
    static void Main(string[] args)
    {

      string plainText = "这是一条被和谐的消息！";
      //加密明文，获得密文
      string EncryptText= Utils.PassWordHelper.Rsa(plainText);
      Console.WriteLine(EncryptText);

      //解密密文，获得明文
      string DecryptText = Utils.PassWordHelper.UnRsa(EncryptText);
      Console.WriteLine(DecryptText);
      Console.ReadKey();

    }
  }
}

运行结果如图：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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asp.net下XML的加密和解密实现方法
解析Asp.net,C# 纯数字加密解密字符串的应用

base64加密解密一段php加密解密的代码

$key = "This is supposed to be a secret key !!!";
function keyED($txt,$encrypt_key)
{
$encrypt_key = md5($encrypt_key);
$ctr=0;
$tmp = "";
for ($i=0;$i{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
$ctr++;
}
return $tmp;
}
function encrypt($txt,$key)
{
srand((double)microtime()*1000000);
$encrypt_key = md5(rand(0,32000));
$ctr=0;
$tmp = "";
for ($i=0;$i{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($encrypt_key,$ctr,1) .
(substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
$ctr++;
}
return keyED($tmp,$key);
}
function decrypt($txt,$key)
{
$txt = keyED($txt,$key);
$tmp = "";
for ($i=0;$i{
$md5 = substr($txt,$i,1);
$i++;
$tmp.= (substr($txt,$i,1) ^ $md5);
}
return $tmp;
}
$string = "Hello World !!!";
// encrypt $string, and store it in $enc_text
$enc_text = encrypt($string,$key);
// decrypt the encrypted text $enc_text, and store it in $dec_text
$dec_text = decrypt($enc_text,$key);
print "Original text : $string
n";
print "Encrypted text : $enc_text
n";
print "Decrypted text : $dec_text
n";
?>

以上就介绍了base64加密解密一段php加密解密的代码，包括了base64加密解密方面的内容，希望对PHP教程有兴趣的朋友有所帮助。

C#实现对AES加密和解密的方法

AES简介

AES（The Advanced Encryption Standard）是美国国家标准与技术研究所用于加密电子数据的规范。它被预期能成为人们公认的加密包括金融、电信和政府数字信息的方法。

AES 是一个新的可以用于保护电子数据的加密算法。明确地说，AES 是一个迭代的、对称密钥分组的密码，它可以使用128、192 和 256 位密钥，并且用 128 位（16字节）分组加密和解密数据。与公共密钥密码使用密钥对不同，对称密钥密码使用相同的密钥加密和解密数据。通过分组密码返回的加密数据的位数与输入数据相同。以下是我经过整理的代码，希望对大家有所帮助：

复制代码代码如下:

/// <summary>
/// ASE加解密
/// </summary>
public class AESHelper
{
    /// <summary>
    /// 获取密钥
    /// </summary>
    private static string Key
    {
        get
        {
            return "abcdef1234567890";    ////必须是16位
        }
    }

//默认密钥向量
private static byte[] _key1 = { 0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF,0x12,0xEF };

    /// <summary>
    /// AES加密算法
    /// </summary>
    /// <param name="plainText">明文字符串</param>
    /// <returns>将加密后的密文转换为Base64编码，以便显示</returns>
    public static string AESEncrypt(string plainText)
    {
        //分组加密算法
        SymmetricAlgorithm des = Rijndael.Create();
        byte[] inputByteArray = Encoding.UTF8.GetBytes(plainText);//得到需要加密的字节数组
        //设置密钥及密钥向量
        des.Key = Encoding.UTF8.GetBytes(Key);
        des.IV = _key1;
        byte[] cipherBytes = null;
        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms,des.CreateEncryptor(),CryptoStreamMode.Write))
            {
                cs.Write(inputByteArray,inputByteArray.Length);
                cs.FlushFinalBlock();
                cipherBytes = ms.ToArray();//得到加密后的字节数组
                cs.Close();
                ms.Close();
            }
        }
        return Convert.ToBase64String(cipherBytes);
    }

    /// <summary>
    /// AES解密
    /// </summary>
    /// <param name="cipherText">密文字符串</param>
    /// <returns>返回解密后的明文字符串</returns>
    public static string AESDecrypt(string showtext)
    {
        byte[] cipherText = Convert.FromBase64String(showtext);

        SymmetricAlgorithm des = Rijndael.Create();
        des.Key = Encoding.UTF8.GetBytes(Key);
        des.IV = _key1;
        byte[] decryptBytes = new byte[cipherText.Length];
        using (MemoryStream ms = new MemoryStream(cipherText))
        {
            using (CryptoStream cs = new CryptoStream(ms,des.CreateDecryptor(),CryptoStreamMode.Read))
            {
                cs.Read(decryptBytes,decryptBytes.Length);
                cs.Close();
                ms.Close();
            }
        }
        return Encoding.UTF8.GetString(decryptBytes).Replace("\0","");   ///将字符串后尾的'\0'去掉
    }
}

Key的值可以放在config文件中，也可放入数据库中。

C#实现对文件进行加密解密的方法

本文实例讲述了C#实现对文件进行加密解密的方法。分享给大家供大家参考。具体如下：

using System;
using System.IO;
using System.Security.Cryptography;
public class Example19_9
{
 public static void Main()
 {
  // Create a new file to work with
  FileStream fsOut = File.Create(@"c:\temp\encrypted.txt");
  // Create a new crypto provider
  TripleDESCryptoServiceProvider tdes =
   new TripleDESCryptoServiceProvider();
  // Create a cryptostream to encrypt to the filestream
  CryptoStream cs = new CryptoStream(fsOut,tdes.CreateEncryptor(),CryptoStreamMode.Write);
  // Create a StreamWriter to format the output
  StreamWriter sw = new StreamWriter(cs);
  // And write some data
  sw.WriteLine("'Twas brillig,and the slithy toves");
  sw.WriteLine("Did gyre and gimble in the wabe.");
  sw.Flush();
  sw.Close();
  // save the key and IV for future use
  FileStream fsKeyOut = File.Create(@"c:\\temp\encrypted.key");
  // use a BinaryWriter to write formatted data to the file
  BinaryWriter bw = new BinaryWriter(fsKeyOut);
  // write data to the file
  bw.Write( tdes.Key );
  bw.Write( tdes.IV );
  // flush and close
  bw.Flush();
  bw.Close();
 }
}

解密代码如下：

using System;
using System.IO;
using System.Security.Cryptography;
public class Example19_10
{
 public static void Main()
 {
  // Create a new crypto provider
  TripleDESCryptoServiceProvider tdes =
   new TripleDESCryptoServiceProvider();
  // open the file containing the key and IV
  FileStream fsKeyIn = File.OpenRead(@"c:\temp\encrypted.key");
  // use a BinaryReader to read formatted data from the file
  BinaryReader br = new BinaryReader(fsKeyIn);
  // read data from the file and close it
  tdes.Key = br.ReadBytes(24);
  tdes.IV = br.ReadBytes(8);
  // Open the encrypted file
  FileStream fsIn = File.OpenRead(@"c:\\temp\\encrypted.txt");
  // Create a cryptostream to decrypt from the filestream
  CryptoStream cs = new CryptoStream(fsIn,tdes.CreateDecryptor(),CryptoStreamMode.Read);
  // Create a StreamReader to format the input
  StreamReader sr = new StreamReader(cs);
  // And decrypt the data
  Console.WriteLine(sr.ReadToEnd());
  sr.Close();
 }
}

希望本文所述对大家的C#程序设计有所帮助。

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