/// <summary>
/// 创建授权文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnSave_Click(object sender, EventArgs e)
{
DateTime time = Convert.ToDateTime(EndTime.Text);
ILicenseData data = new ILicenseData
{
CompanyName = CompanyName.Text,
DomainName = DomainName.Text,
Guid = Guid.Parse(guid.Text),
Count = Convert.ToInt32(Count.Text),
UnixEndTime = DateHelper.DateTimeToUnix(time)
};
LicenseHelper.CreateLicense(data);
}
/// <summary>
/// 查看授权文件信息
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnView_Click(object sender, EventArgs e)
{
Alert(Label3, "", "");
if (FileUpload1.HasFile && FileUpload1.PostedFile.ContentLength > 0)
{
try
{
ILicenseData data = LicenseHelper.DecryptLicense(FileUpload1.PostedFile.InputStream);
this.SetFormValue(data);
}
catch
{
Alert(Label3, "文件无效!", "line1px_2");
}
}
else
{
Alert(Label3, "未选择文件!", "line1px_2");
}
}
/// <summary>
/// 生成授权文件
/// </summary>
/// <param name="data"></param>
public static void CreateLicense(ILicenseData data)
{
Int32 count = data.Count;
String json = JsonConvert.SerializeObject(data);
Byte[] buffer = Encoding.UTF8.GetBytes(json);
#region 7z压缩加密
Byte[] zipBuffer = Encoding.UTF8.GetBytes(Math.Pow(3, count / 2).ToString("0"));
String zipPassword = MD5Upper32(String.Join("&", zipBuffer));
SevenZipCompressor zip = new SevenZipCompressor()
{
DefaultItemName = "license",
EncryptHeaders = true,
FastCompression = true,
ScanOnlyWritable = true,
CompressionLevel = CompressionLevel.High,
CompressionMethod = CompressionMethod.Lzma2
};
using (MemoryStream stream = new MemoryStream(buffer))
{
using (MemoryStream ms = new MemoryStream())
{
zip.CompressStream(stream, ms);
//zip.CompressStream(stream, ms, zipPassword);
ms.Position = 6;//去掉7z头文件信息
buffer = new Byte[ms.Length - ms.Position];
ms.Read(buffer, 0, buffer.Length);
}
}
#endregion
Array.Reverse(buffer, 0, buffer.Length);//反转流
#region DES在次加密
for (int i = 1; i <= count; i++)
{
String[] arr = new String[5];
for (int j = 2; j < 7; j++)
{
String v1 = Math.Pow(j, i).ToString("0");
arr[j - 2] = v1;
}
String key = MD5Upper32(String.Join("#", arr));
buffer = EncryptDES(buffer, key);
}
#endregion
#region 文件尾写入加密次数
Byte[] byt = new Byte[] { (Byte)count };
buffer = buffer.Concat(byt).ToArray();
#endregion
#region 输出文件
String base64 = Convert.ToBase64String(buffer, Base64FormattingOptions.InsertLineBreaks);
Byte[] head = new Byte[256];
StringBuilder sb = new StringBuilder(256);
sb.AppendLine("Warning: Please don't delete or modify this file.");
sb.AppendLine("Have any questions, please contact the author.");
sb.AppendLine();
sb.AppendLine("author:Jin Jia You Email:[email protected]");
Encoding.UTF8.GetBytes(sb.ToString()).CopyTo(head, 0);
HttpResponse Response = HttpContext.Current.Response;
Response.Clear();
Response.ContentType = "text/plain";
Response.ContentEncoding = Encoding.GetEncoding("UTF-8");
Response.AddHeader("Content-Disposition", "attachment; filename=license.txt");
using (StreamWriter sw = new StreamWriter(Response.OutputStream, Encoding.UTF8))
{
sw.Write(Encoding.UTF8.GetString(head));
sw.WriteLine();
sw.Write(base64);
}
Response.Flush();
Response.End();
#endregion
}
/// <summary>
/// 解密授权文件
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public static ILicenseData DecryptLicense(Stream file)
{
Int32 count = 0;
Byte[] buffer = new Byte[] { };
file.Position = 256 + 4;
using (BinaryReader br = new BinaryReader(file, Encoding.UTF8))
{
Byte[] byt = br.ReadBytes((int)(file.Length - file.Position));
String base64 = Encoding.UTF8.GetString(byt);
byt = Convert.FromBase64String(base64);
count = byt[byt.Length - 1]; //读取加密次数
buffer = new Byte[byt.Length - 1]; //读取加密正文
Array.Copy(byt, buffer, buffer.Length);
}
#region DES解密
for (int i = count; i >= 1; i--)
{
String[] arr = new String[5];
for (int j = 2; j < 7; j++)
{
String v1 = Math.Pow(j, i).ToString("0");
arr[j - 2] = v1;
}
String key = MD5Upper32(String.Join("#", arr));
buffer = DecryptDES(buffer, key);
}
#endregion
Array.Reverse(buffer, 0, buffer.Length);
#region 7z解密
Byte[] zipBuffer = Encoding.UTF8.GetBytes(Math.Pow(3, count / 2).ToString("0"));
String zipPassword = MD5Upper32(String.Join("&", zipBuffer));
using (MemoryStream stream = new MemoryStream())
{
stream.Write(new Byte[] { 0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C }, 0, 6);
stream.Write(buffer, 0, buffer.Length);
using (SevenZipExtractor zip = new SevenZipExtractor(stream, zipPassword))
{
using (MemoryStream ms = new MemoryStream())
{
zip.ExtractFile(0, ms);
buffer = ms.ToArray();
}
}
}
#endregion
String json = Encoding.UTF8.GetString(buffer);
ILicenseData data = JsonConvert.DeserializeObject <ILicenseData>(json);
return(data);
}
