/// <summary>
/// DES加密，向量随机生成
/// </summary>
/// <param name="plaintext">明文</param>
/// <returns></returns>
public static string DesEncrypt(string plaintext)
{
//随机生成8位向量
string iv = GenerateRandom();
byte[] rgbKey = System.Text.Encoding.ASCII.GetBytes("SolinArt");
byte[] rgbIV = System.Text.Encoding.ASCII.GetBytes(iv);
byte[] _data = System.Text.Encoding.UTF8.GetBytes(plaintext);
System.Security.Cryptography.DESCryptoServiceProvider _des = new System.Security.Cryptography.DESCryptoServiceProvider();
System.Security.Cryptography.ICryptoTransform _encrypt = _des.CreateEncryptor(rgbKey, rgbIV);
byte[] _result = _encrypt.TransformFinalBlock(_data, 0, _data.Length);
_encrypt.Dispose();
_des.Clear();
string result = BitConverter.ToString(_result);
result = iv + result.Replace("-", "");
//首尾各加16位共计32位的MD5校验码
#region 32位的MD5校验码
//string _md5 = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(result, "MD5");
string _md5 = Md5(result);
result = string.Format("{0}{1}{2}"
, _md5.Substring(0, 16)
, result
, _md5.Substring(16)
);
#endregion
return(result);
}
/// <summary>
/// DES解密
/// </summary>
public static string DesDecrypt(string encrypted)
{
//小于40位时，不是有效的加密串
if (encrypted.Length <= 40)
{
return("");
}
else if (encrypted.Length % 2 != 0)
{
return(""); //非偶数位不是有效的加密串
}
//32位MD5校验码
string _md5 = encrypted.Substring(0, 16);
_md5 += encrypted.Substring(encrypted.Length - 16);
//移除MD5
encrypted = encrypted.Substring(16);
encrypted = encrypted.Substring(0, encrypted.Length - 16);
//进行MD5验证是否被修改
//if (_md5 != System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(encrypted, "MD5"))
if (_md5 != Md5(encrypted))
{
return("");
}
//截取，移除前8位向量长度
string iv = encrypted.Substring(0, 8);
//移除向量值
encrypted = encrypted.Substring(8);
//32位整型转换器
System.ComponentModel.Int32Converter _int32 = new System.ComponentModel.Int32Converter();
//字符串转换成数组
byte[] _datas = new byte[encrypted.Length / 2];
for (int i = 0; i < _datas.Length; i++)
{
_datas[i] = Convert.ToByte(_int32.ConvertFromInvariantString("0x" + encrypted.Substring(i * 2, 2)));
}
byte[] rgbKey = System.Text.Encoding.ASCII.GetBytes("SolinArt");
byte[] rgbIV = System.Text.Encoding.ASCII.GetBytes(iv);
System.Security.Cryptography.DESCryptoServiceProvider _des = new System.Security.Cryptography.DESCryptoServiceProvider();
System.Security.Cryptography.ICryptoTransform _encrypt = _des.CreateDecryptor(rgbKey, rgbIV);
byte[] _result = _encrypt.TransformFinalBlock(_datas, 0, _datas.Length);
_encrypt.Dispose();
_des.Clear();
return(System.Text.Encoding.UTF8.GetString(_result));
}