public class EncryptHelper
{
public static string EncryptMd5Str(string str)
{
MD5 md5Obj = MD5.Create();
byte[] buffer = System.Text.Encoding.Default.GetBytes(str);
byte[] Md5Buffer = md5Obj.ComputeHash(buffer);
return BitConverter.ToString(Md5Buffer).Replace("-", "").ToLower();
}
/// <summary>
/// 简单加密函数
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>返回加密后的字符串</returns>
///
public string simple_Encode(string str)
{
string s = "";
try
{
for (int i = ; i < str.Length; i++)
{
s += (char)(str[i] + - * );
}
return s;
}
catch
{
return str;
}
} /// <summary>
/// 简单解密函数
/// </summary>
/// <param name="str">要解密的字符串</param>
/// <returns>返回解密后的字符串</returns>
///
public string simple_Decode(string str)
{
string s = "";
try
{
for (int i = ; i < str.Length; i++)
{
s += (char)(str[i] - + * );
}
return s;
}
catch
{
return str;
}
} //默认密钥向量
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; /// <summary>
/// 对称加密法加密函数
/// </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，失败返回源串</returns> public string symmetry_Encode(string encryptString, string encryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(, ));
byte[] rgbIV = Keys;
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, , inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
catch
{
return encryptString;
}
} /// <summary>
/// 对称加密法解密函数
/// </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，失败返源串</returns> public string symmetry_Decode(string decryptString, string decryptKey)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, , inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
}
} }