public static class Common
{
#region MD5加密
/// <summary>
/// MD5加密
/// </summary>
/// <param name="strSource">需要加密的字符串</param>
/// <returns>MD5加密后的字符串</returns>
public static string Md5Encrypt(string strSource)
{
//把字符串放到byte数组中
byte[] bytIn = System.Text.Encoding.Default.GetBytes(strSource);
//建立加密对象的密钥和偏移量
byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量
byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥
//实例DES加密类
DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
mobjCryptoService.Key = iv;
mobjCryptoService.IV = key;
ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
//实例MemoryStream流加密密文件
System.IO.MemoryStream ms = new System.IO.MemoryStream();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
cs.Write(bytIn, 0, bytIn.Length);
cs.FlushFinalBlock();
return System.Convert.ToBase64String(ms.ToArray());
}
/// <summary>
/// MD5解密
/// </summary>
/// <param name="Source">需要解密的字符串</param>
/// <returns>MD5解密后的字符串</returns>
public static string Md5Decrypt(string Source)
{
//将解密字符串转换成字节数组
byte[] bytIn = System.Convert.FromBase64String(Source);
//给出解密的密钥和偏移量，密钥和偏移量必须与加密时的密钥和偏移量相同
byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量
byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥
DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
mobjCryptoService.Key = iv;
mobjCryptoService.IV = key;
//实例流进行解密
System.IO.MemoryStream ms = new System.IO.MemoryStream(bytIn, 0, bytIn.Length);
ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
StreamReader strd = new StreamReader(cs, Encoding.Default);
return strd.ReadToEnd();
}
#endregion
#region 动态加密
private static byte[] s_bytKey;
static Common()
{
s_bytKey = new byte[] { 0xa1, 0xb2, 0xc3, 0xd4, 0xe5, 0x16, 0x27, 0x38, 0x49, 80, 0x61, 0x72, 0x83, 0x94, 0xa5, 0xb6 };
}
/// <summary>
/// 解密
/// </summary>
/// <param name="text"></param>
/// <param name="key"></param>
/// <returns></returns>
public static string PutBykey(string text, string key)
{
byte[] buffer = new byte[text.Length];
byte[] bytes = Encoding.UTF8.GetBytes(Dscf.Global.Common.Common.DisposeId(key));
RijndaelManaged managed = new RijndaelManaged();
buffer = Convert.FromBase64String(text);
MemoryStream stream = new MemoryStream();
CryptoStream stream2 = new CryptoStream(stream, managed.CreateDecryptor(bytes, s_bytKey), CryptoStreamMode.Write);
stream2.Write(buffer, 0, buffer.Length);
stream2.FlushFinalBlock();
Encoding encoding = new UTF8Encoding();
return encoding.GetString(stream.ToArray());
}
/// <summary>
/// 加密
/// </summary>
/// <param name="text"></param>
/// <param name="key"></param>
/// <returns></returns>
public static string GetByKey(string text, string key)
{
byte[] bytes = Encoding.UTF8.GetBytes(text);
byte[] rgbKey = Encoding.UTF8.GetBytes(Dscf.Global.Common.Common.DisposeId(key));
RijndaelManaged managed = new RijndaelManaged();
MemoryStream stream = new MemoryStream();
CryptoStream stream2 = new CryptoStream(stream, managed.CreateEncryptor(rgbKey, s_bytKey), CryptoStreamMode.Write);
stream2.Write(bytes, 0, bytes.Length);
stream2.FlushFinalBlock();
return Convert.ToBase64String(stream.ToArray());
}
/// <summary>
/// 处理Id，转变为加密key
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public static string DisposeId(string id)
{
string strValue = "";
for (int i = 0; i < 9 - id.Length; i++)
{
strValue += i;
}
return id.ToString() + strValue;
}
#endregion
}