{
public static class Crypter
{
private static string FDefaultPassword = typeof(Crypter).FullName;
public static string DefaultPassword
{
set
{
Crypter.FDefaultPassword = value;
}
}
public static Stream Encrypt(Stream dest, string password)
{
ICryptoTransform transform = null;
using (PasswordDeriveBytes passwordDeriveBytes = new PasswordDeriveBytes(password, Encoding.UTF8.GetBytes("Salt")))
{
transform = new RijndaelManaged
{
Padding = PaddingMode.ISO10126
}.CreateEncryptor(passwordDeriveBytes.GetBytes(), passwordDeriveBytes.GetBytes());
}
dest.Write(new byte[]
{
,
,
}, , );
return new CryptoStream(dest, transform, CryptoStreamMode.Write);
}
public static Stream Decrypt(Stream source, string password)
{
ICryptoTransform transform = null;
using (PasswordDeriveBytes passwordDeriveBytes = new PasswordDeriveBytes(password, Encoding.UTF8.GetBytes("Salt")))
{
transform = new RijndaelManaged
{
Padding = PaddingMode.ISO10126
}.CreateDecryptor(passwordDeriveBytes.GetBytes(), passwordDeriveBytes.GetBytes());
}
int arg_5C_0 = source.ReadByte();
int num = source.ReadByte();
int num2 = source.ReadByte();
if (arg_5C_0 == && num == && num2 == )
{
return new CryptoStream(source, transform, CryptoStreamMode.Read);
}
source.Position -= 3L;
return null;
}
public static bool IsStreamEncrypted(Stream stream)
{
int arg_25_0 = stream.ReadByte();
int num = stream.ReadByte();
int num2 = stream.ReadByte();
stream.Position -= 3L;
return arg_25_0 == && num == && num2 == ;
}
public static string EncryptString(string data)
{
return Crypter.EncryptString(data, Crypter.FDefaultPassword);
}
public static string EncryptString(string data, string password)
{
if (string.IsNullOrEmpty(data) || string.IsNullOrEmpty(password))
{
return data;
}
string result;
using (MemoryStream memoryStream = new MemoryStream())
{
using (Stream stream = Crypter.Encrypt(memoryStream, password))
{
byte[] bytes = Encoding.UTF8.GetBytes(data);
stream.Write(bytes, , bytes.Length);
}
result = "rij" + Convert.ToBase64String(memoryStream.ToArray());
}
return result;
}
public static string DecryptString(string data)
{
return Crypter.DecryptString(data, Crypter.FDefaultPassword);
}
public static string DecryptString(string data, string password)
{
if (string.IsNullOrEmpty(data) || string.IsNullOrEmpty(password) || !data.StartsWith("rij"))
{
return data;
}
data = data.Substring();
string @string;
using (Stream stream = Converter.FromString(typeof(Stream), data) as Stream)
{
using (Stream stream2 = Crypter.Decrypt(stream, password))
{
byte[] array = new byte[data.Length];
int count = stream2.Read(array, , array.Length);
@string = Encoding.UTF8.GetString(array, , count);
}
}
return @string;
}
public static string ComputeHash(Stream input)
{
byte[] array = new byte[input.Length];
input.Read(array, , array.Length);
return Crypter.ComputeHash(array);
}
public static string ComputeHash(byte[] input)
{
return BitConverter.ToString(new Murmur3().ComputeHash(input)).Replace("-", string.Empty);
}
public static string ComputeHash(string input)
{
return Crypter.ComputeHash(Encoding.UTF8.GetBytes(input));
}
}
}
来自：https://github.com/FastReports/FastReport
遇到一串不知道具体编码的字符串，使用以下代码勉强转中文了：
str = str.Replace("9B25", "");
List<byte> buffer = new List<byte>();
for (int i = ; i < str.Length; i++)
{
if (i % == )
{
string s = str.Substring(i - , );
buffer.Add(Convert.ToByte(s, ));
}
}
Encoding.Default.GetString(buffer.ToArray());