最近@pjy612大佬接连几篇精华帖看得真是过瘾，掀起了一波学习的小高潮，我也算是入了点门，尤其是使用Harmony(X)的骚操作，下面接着大佬的帖子（https://www.52pojie.cn/thread-1771932-1-1.html），继续分析该插件的注册码（注册机）。
学习总结
乍一看大佬的帖子一头雾水，相信也吓退了一部分小白，下面先总结一下，提取一下关键点，前贴总共介绍了2种Patch的方法：
1、使用内部自带的注册码
此时license是“GrapeCity-Internal-License”开头，需要验证调用程序的签名，如果不是指定范围内的程序,则会触发异常。
//amj.l(A_0)
internal bool a(string A_0)
{
return A_0 != null && A_0.StartsWith("GrapeCity-Internal-License,", StringComparison.Ordinal);
}
//amj.j(A_1)
internal bool a(object A_0)
{
Assembly assembly = A_0 as Assembly;
if (A_0 == null)
{
return false;
}
byte[] publicKeyToken = assembly.GetName().GetPublicKeyToken();
ulong num = 0UL;
if (publicKeyToken == null)
{
return false;
}
for (int i = 0; i
Patch此处函数a，返回true即可。
2、通过伪造key
internal static string GetLicense(Type t)
{
string name = "52pojie";
var temp = new
{
S = Convert.ToBase64String(Encoding.UTF8.GetBytes("0")),
D = new
{
Id = name,
Prd = new[]
{
new {N = "WU5D", C = "WU5D"}
},
Crt = DateTime.Now.ToString("yyyyMMdd hhmmss", CultureInfo.InvariantCulture)
}
};
string json = JsonConvert.SerializeObject(temp);
string lic = (string)t.Assembly.GetType("GrapeCity.Documents.Excel.sp").GetMethod("g").Invoke(null, new object?[] { json }); ;
return $"{name}#A0{lic}";
}
其中的参数“S”就是数据的签名信息，因为“S”不正确，验签时VerifyData函数不能通过，此时Patch该函数返回true也可以达到目的。
// this.d('s').a() -> so("wE+VWE4exHP+ieziZg+Cgf7sJslBhVzJbPXZQwfGUfU27NqODPzCpizjAPz6NnKw8GCiHpug6D+bUxmutcBmUw==", "AQAB").a() -> RSA鉴权
internal class so
{
// Token: 0x060031AD RID: 12717 RVA: 0x001EE44C File Offset: 0x001EC64C
public so(string A_0, string A_1)
{
this.a.ImportParameters(new RSAParameters
{
Modulus = Convert.FromBase64String(A_0),
Exponent = Convert.FromBase64String(A_1 ?? "AQAB")
});
}
// Token: 0x060031AE RID: 12718 RVA: 0x001EE4A1 File Offset: 0x001EC6A1
public bool a(string A_0, string A_1)
{
return !string.IsNullOrEmpty(A_1) && this.a.VerifyData(Encoding.UTF8.GetBytes(A_0), "SHA1", Convert.FromBase64String(A_1));
}
// Token: 0x04001503 RID: 5379
private readonly RSACryptoServiceProvider a = new RSACryptoServiceProvider();
}
终极目标---注册码（注册机）
1、RSA加解密介绍
从验证方式看，本插件用的是RSA非对称加解密。数据加签是RSA加解密的基本操作，钥匙对包含公钥和私钥，通常私钥加签，公钥解密，所以通常公钥是公开的，私钥作者持有，不会公开。
2、本软件的公钥信息
("wE+VWE4exHP+ieziZg+Cgf7sJslBhVzJbPXZQwfGUfU27NqODPzCpizjAPz6NnKw8GCiHpug6D+bUxmutcBmUw==", "AQAB")，看看长度：
string m = "wE+VWE4exHP+ieziZg+Cgf7sJslBhVzJbPXZQwfGUfU27NqODPzCpizjAPz6NnKw8GCiHpug6D+bUxmutcBmUw==";
RSACryptoServiceProvider rsp = new RSACryptoServiceProvider();
rsp.ImportParameters(new RSAParameters
{
Modulus = Convert.FromBase64String(m),
Exponent = Convert.FromBase64String("AQAB")
});
int keysize = rsp.KeySize;//512位
根据网上大佬的经验总结，512及以下位数的key是可以通过因式分解求得私钥的（超过512位就先止步吧）。经过三七四十九天的分解，终于分解成功拿到私钥了。有了私钥是生成注册码的关键和基础。
3、分析加签过程
由上面分析可知，要想生成注册码，只需要对注册数据加签并写到参数“S”中即可。
原内部key："GrapeCity-Internal-License,296578427539473#A0GSMwWZjhXRgI7bmBCduVWb5N6bEByQHJiOi8kI1tlOiQmcQJCLiQDN9UjMwASNxATMwIDMyIiOiQncDJCLikHdpNUZwFmcHJiOiEmTDJCLiMzN4kzM5cjM4gzN5YTOyIiOiQWSisnOiQkIsISP3cXVqtiN9kFWwc5LVZTV5VmZFdWM5xUOolWNrdHNpxUV7MzSnhDWEllS8oHc6V5T8AzMmhjSxJVMUpWeZZlQyYnY6BTVHZzS6RnS9clTYJUcht6dDJEaiojITJCL5AzN8EjM6MTN0IicfJye#4Xfd5nINJDOZJiOiMkIsICN6BCdl9kLgwWZjhXRgI7bmBCduVWb5N6bEByQHJiOi8kI1xSfiM5VNNlI0IyQiwiI4YHI4VmTuAyZul6Zh5WSgI7bmBCduVWb5N6bEByQHJiOi8kI1xSfig4UXFlI0IyQiwiI4YHI4VmTuAiZkBFIy3mZgQnbl5Wdj3GRgM4RiojIOJyes4nI4IUULJiOiMkIsICN6BCdl9kLgQmcvdFIy3mZgQnbl5Wdj3GRgM4RiojIOJyes4nIFx4REJiOiMkIsICN6B3YsF"
key_.png (119.54 KB, 下载次数: 0)
下载附件
2023-4-17 08:49 上传
将key用字符串“#A0”分割成2部分，后一部分解密：
key1_.png (134.34 KB, 下载次数: 0)
下载附件
2023-4-17 08:49 上传
{
"_r": 536218705,
"S": "hBCwkaqBXNW9JtvK6GU0vbv2BVYyjT1RqJ8f308OUvpz8JYDX8gK37ULi4wk5ih9Lu1gEfeuU6U/W0XY96+jUw==",
"D": {
"Id": "296578427539473",
"CNa": "GrapeCity",
"Crt": "20201015 025944",
"Prd": [{
"N": "GC Document for Excel Java v4",
"C": "DGLE"
}, {
"N": "GC Document for Word .Net v4",
"C": "KQB4"
}, {
"N": "GC Document for Pdf .Net v4",
"C": "QWSH"
}, {
"N": "GC Document for Imaging .Net v4",
"C": "SMWS"
}, {
"N": "GC Document for Excel .Net v4",
"C": "Y82M"
}]
}
}
其中“S”为签名信息，“D”为授权信息。
授权信息构成：
public static string a(this sj A_0)
{
if (A_0 == null)
{
return "";
}
StringBuilder stringBuilder = new StringBuilder();
using (StringWriter stringWriter = new StringWriter(stringBuilder, CultureInfo.InvariantCulture))
{
stringWriter.Write("{");
if (A_0.a() != null)
{
stringWriter.Write("\"{0}\":", "Anl");
stringWriter.Write("{");
stringWriter.Write("\"{0}\":{1}", "dsr", Convert.ToString(A_0.a().Value).ToLowerInvariant());
stringWriter.Write("},");
}
stringWriter.Write("\"{0}\":\"{1}\",", "Id", A_0.k());//必须项
if (A_0.j())
{
stringWriter.Write("\"{0}\":{1},", "Evl", Convert.ToString(A_0.j()).ToLowerInvariant());
}
if (!string.IsNullOrEmpty(A_0.i()))
{
stringWriter.Write("\"{0}\":\"{1}\",", "OId", A_0.i());
}
if (!string.IsNullOrEmpty(A_0.h()))
{
stringWriter.Write("\"{0}\":\"{1}\",", "CNa", A_0.h());
}
if (!string.IsNullOrEmpty(A_0.g()))
{
stringWriter.Write("\"{0}\":\"{1}\",", "CId", A_0.g());
}
if (!string.IsNullOrEmpty(A_0.f()))
{
stringWriter.Write("\"{0}\":\"{1}\",", "Dms", A_0.f());
}
if (!string.IsNullOrEmpty(A_0.e()))
{
stringWriter.Write("\"{0}\":\"{1}\",", "Ips", A_0.e());
}
if (A_0.d() != null)
{
stringWriter.Write("\"{0}\":\"{1}\",", "Exp", A_0.d().Value.ToString("yyyyMMdd", CultureInfo.InvariantCulture));
}
stringWriter.Write("\"{0}\":\"{1}\",", "Crt", A_0.c().ToString("yyyyMMdd hhmmss", CultureInfo.InvariantCulture));//必须项
stringWriter.Write("\"{0}\":[{1}]", "Prd", string.Join(",", A_0.b().Select(new Func(sn.c.9.a))));//必须项
stringWriter.Write("}");
}
return stringBuilder.ToString();
}
由上可知仅有Id，Crt和Prd三项必须，其余可无，若有必须按照上面的顺序。这也是之前大佬构造key的基础。
string name = "52pojie";
var temp = new
{
S = Convert.ToBase64String(Encoding.UTF8.GetBytes("0")),
D = new
{
Id = name,
Prd = new[]
{
new {N = "WU5D", C = "WU5D"}
},
Crt = DateTime.Now.ToString("yyyyMMdd hhmmss", CultureInfo.InvariantCulture)
}
};
4、注册码（注册机）
根据以上分析可以写出注册机，生成注册码：
验签数据=第一部分数据 + 分隔符("#A0") + D(授权信息)，然后根据RSA的加签函数（此处需要用到前面提到的私钥）生成签名信息S。最后再加密生成注册码。
sign_.png (82.03 KB, 下载次数: 0)
下载附件
2023-4-17 08:49 上传
sn.PNG (16.19 KB, 下载次数: 0)
下载附件
2023-4-17 08:49 上传
5、可用key及使用方法
提供一组可用key，设置了有效期：2023-12-31，直接使用如下：
string license=@"52pojie#A0iiW34TQxo7NQ9EMUNUV9pmY5M6c7gEexJXQrIkbpdlbvIXO7l5ZtFUcPlldHZ6MzdnSJpXe8dTe92mbrMGaQdjUQlGehVWTD5kbTNXaWlnNVV6RqVDbRljcnJiOiMlIsIiN6YjN6YjI0IicfJye&Qf35VfiQUNVdlI0IyQiwiIsV6Y8VkI0IiTis7W0ICZyBlIsICMwADMyEDI5EDNwMjMwIjI0ICdyNkIsISMzITMzIDMyIiOiAHeFJCLiIjMxMHciojIh94QiwiI8gDO8gDO8gjI0ICZJJye0rCii";
Workbook workbook = new GrapeCity.Documents.Excel.Workbook(license);
IWorksheet worksheet = workbook.Worksheets[0];
worksheet.Cells[0].Value = "Hell0 worsddf";
workbook.Save("test.xlsx");
搞定~~~
注意事项
仅限于学习交流，请勿用于商业或非法用途。
