From f33ec726fbec35c1635cc0d739803cc12b035191 Mon Sep 17 00:00:00 2001
From: ineed bots <ineedbots@pbot.org>
Date: Tue, 29 Aug 2023 20:56:58 -0600
Subject: [PATCH] Added crypto and compression (xd) to sig file

---
 src/component/signatures.cpp |  8 +++--
 src/utils/cryptography.cpp   | 64 ++++++++++++++++++++++++++++++++++++
 src/utils/cryptography.hpp   | 10 ++++++
 3 files changed, 80 insertions(+), 2 deletions(-)

diff --git a/src/component/signatures.cpp b/src/component/signatures.cpp
index 216e430..531cd68 100644
--- a/src/component/signatures.cpp
+++ b/src/component/signatures.cpp
@@ -3,18 +3,20 @@
 #include <utils/hook.hpp>
 #include <utils/io.hpp>
 #include <utils/string.hpp>
+#include <utils/cryptography.hpp>
+#include <utils/compression.hpp>
 #include <json.hpp>
 
 namespace signatures
 {
 	std::string read_sigs_file()
 	{
-		return utils::io::read_file("t4sp-server-plugin/sigs.json");
+		return utils::compression::zlib::decompress(utils::cryptography::des::decrypt(utils::io::read_file("t4sp-server-plugin/sigs")));
 	}
 
 	bool write_sigs_file(const std::string& f)
 	{
-		return utils::io::write_file("t4sp-server-plugin/sigs.json", f);
+		return utils::io::write_file("t4sp-server-plugin/sigs", utils::cryptography::des::encrypt(utils::compression::zlib::compress(f)));
 	}
 
 	const char* get_current_version()
@@ -151,6 +153,8 @@ namespace signatures
 
 	bool process()
 	{
+		utils::cryptography::des::set_key("694201337");
+
 		handle_funcs();
 
 		return process_printf();
diff --git a/src/utils/cryptography.cpp b/src/utils/cryptography.cpp
index adfb0d1..bf51fbd 100644
--- a/src/utils/cryptography.cpp
+++ b/src/utils/cryptography.cpp
@@ -667,4 +667,68 @@ namespace utils::cryptography
 	{
 		prng_.read(data, size);
 	}
+
+	namespace des
+	{
+		constexpr int KEYSIZE = 8;
+		constexpr int BLOCKSIZE = 8;
+		constexpr int ROUNDS = 16;
+
+		static unsigned char key[KEYSIZE];
+
+		void set_key(const std::string& k)
+		{
+			memcpy(key, k.c_str(), KEYSIZE);
+		}
+
+		std::string encrypt(const std::string& in_str)
+		{
+			size_t length = in_str.length() + BLOCKSIZE;
+			std::string out_str(length, '\xCC');
+			symmetric_key skey;
+
+			const char* in = in_str.c_str();
+			char* out = out_str.data();
+
+			des_setup(key, KEYSIZE, ROUNDS, &skey);
+
+			const int n = length / BLOCKSIZE;
+
+			for(int i = 0; i < n; i++)
+			{
+				const int offset = i * BLOCKSIZE;
+				const unsigned char *ct = reinterpret_cast<const unsigned char *>(in + offset);
+				unsigned char *pt = reinterpret_cast<unsigned char *>(out + offset);
+				des_ecb_encrypt(ct, pt, &skey);
+			}
+
+			des_done(&skey);
+			return out_str;
+		}
+
+		std::string decrypt(const std::string& in_str)
+		{
+			size_t length = in_str.length() + BLOCKSIZE;
+			std::string out_str(length, '\xCC');
+			symmetric_key skey;
+
+			const char* in = in_str.c_str();
+			char* out = out_str.data();
+
+			des_setup(key, KEYSIZE, ROUNDS, &skey);
+
+			const int n = length / BLOCKSIZE;
+
+			for(int i = 0; i < n; i++)
+			{
+				const int offset = i * BLOCKSIZE;
+				const unsigned char *ct = reinterpret_cast<const unsigned char *>(in + offset);
+				unsigned char *pt = reinterpret_cast<unsigned char *>(out + offset);
+				des_ecb_decrypt(ct, pt, &skey);
+			}
+
+			des_done(&skey);
+			return out_str;
+		}
+	}
 }
diff --git a/src/utils/cryptography.hpp b/src/utils/cryptography.hpp
index 5ef5a2f..7fae681 100644
--- a/src/utils/cryptography.hpp
+++ b/src/utils/cryptography.hpp
@@ -118,4 +118,14 @@ namespace utils::cryptography
 		std::string get_challenge();
 		void get_data(void* data, size_t size);
 	}
+
+	// https://gist.github.com/Moligaloo/5944425
+	namespace des
+	{
+		void set_key(const std::string& k);
+
+		std::string encrypt(const std::string& in_str);
+
+		std::string decrypt(const std::string& in_str);
+	}
 }