C#字符串使用密钥进行加解密

第一个为大家分享的是C#字符串使用密钥进行加解密代码，具体内容如下

public class DesEncrypt
  {
    /// <summary>
    /// 算法偏移量
    /// </summary>
    const string m_IV = "12345678";
 
    /// <summary>
    /// 功能描述:根据输入的密钥生成8位密钥
    /// 作　　者: 爱给模板网 2gei.cn
    /// 创建日期:2015-07-20 17:25:26
    /// </summary>
    /// <param name="strkey">strkey</param>
    /// <returns>8位密钥</returns>
    private static string GetKey(string strkey)
    {
      if (string.IsNullOrEmpty(strkey))
      {
        strkey = "InfoColl";
      }
      if (strkey.Length % 8 == 0)
      {
        return strkey;
      }
      else
      {
        return GetKey(strkey + "0");
      }
    }
 
    /// <summary>
    /// 功能描述:加密字符串
    /// 作　　者: 爱给模板网 2gei.cn
    /// 创建日期:2015-07-20 17:18:31
    /// 任务编号:
    /// </summary>
    /// <param name="strSourceString">原字符串</param>
    /// <param name="strKey">密钥</param>
    /// <returns>加密后的字符串</returns>
    public static string Encrypt(string strSourceString, string strKey)
    {
      strKey = GetKey(strKey);
      byte[] btKey = Encoding.UTF8.GetBytes(strKey);
 
      byte[] btIV = Encoding.UTF8.GetBytes(m_IV);
 
      DESCryptoServiceProvider des = new DESCryptoServiceProvider();
 
      using (MemoryStream ms = new MemoryStream())
      {
        try
        {
          byte[] inData = Encoding.UTF8.GetBytes(strSourceString);
          using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))
          {
            cs.Write(inData, 0, inData.Length);
 
            cs.FlushFinalBlock();
          }
 
          return Convert.ToBase64String(ms.ToArray());
        }
        catch
        {
          return strSourceString;
        }
      }
    }
 
    /// <summary>
    /// 功能描述:解密字符串
    /// 作　　者: 爱给模板网 2gei.cn
    /// 创建日期:2015-07-20 17:18:49
    /// 任务编号:
    /// </summary>
    /// <param name="strEncryptedString">原字符串</param>
    /// <param name="strKey">密钥</param>
    /// <returns>解密后的字符串</returns>
    public static string Decrypt(string strEncryptedString, string strKey)
    {
      strKey = GetKey(strKey);
      byte[] btKey = Encoding.UTF8.GetBytes(strKey);
 
      byte[] btIV = Encoding.UTF8.GetBytes(m_IV);
 
      DESCryptoServiceProvider des = new DESCryptoServiceProvider();
 
      using (MemoryStream ms = new MemoryStream())
      {
        try
        {
          byte[] inData = Convert.FromBase64String(strEncryptedString);
          using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write))
          {
            cs.Write(inData, 0, inData.Length);
 
            cs.FlushFinalBlock();
          }
 
          return Encoding.UTF8.GetString(ms.ToArray());
        }
        catch
        {
          return strEncryptedString;
        }
      }
    }
  }

								 
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