Cryptography WIP

Password_manager/Password_manager.vcxproj

@@ -133,11 +133,14 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
-    <ClCompile Include="source\clipboard.cpp" />
+    <ClCompile Include="source\win.cpp" />
+    <ClCompile Include="source\cryptography.cpp" />
     <ClCompile Include="source\main.cpp" />
   </ItemGroup>
   <ItemGroup>
-    <ClInclude Include="include\clipboard.hpp" />
+    <ClInclude Include="include\buffer.h" />
+    <ClInclude Include="include\win.h" />
+    <ClInclude Include="include\cryptography.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

Password_manager/Password_manager.vcxproj.filters

@@ -18,12 +18,21 @@
     <ClCompile Include="source\main.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="source\clipboard.cpp">
+    <ClCompile Include="source\win.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="source\cryptography.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
   </ItemGroup>
   <ItemGroup>
-    <ClInclude Include="include\clipboard.hpp">
+    <ClInclude Include="include\win.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="include\cryptography.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="include\buffer.h">
       <Filter>Header Files</Filter>
     </ClInclude>
   </ItemGroup>

Password_manager/include/Buffer.h

@@ -0,0 +1,25 @@
+#pragma once
+
+
+class Buffer
+{
+public:
+	unsigned char* buffer = nullptr;
+	size_t size = 0;
+	Buffer(size_t size)
+	{
+		this->size = size;
+		this->buffer = new unsigned char[size];
+	}
+
+	Buffer() {
+		size = 0;
+		buffer = nullptr;
+	}
+
+	~Buffer()
+	{
+		if (buffer)	delete[] buffer;
+	}
+
+};

Password_manager/include/clipboard.hpp

@@ -1,3 +0,0 @@
-#pragma once
-
-bool put_data_on_clipboard(const char* text);

Password_manager/include/cryptography.h

@@ -0,0 +1,23 @@
+#pragma once
+#include <cstdint>
+
+struct evp_cipher_ctx_st;
+typedef struct evp_cipher_ctx_st EVP_CIPHER_CTX;
+
+
+class Cryptography
+{
+public:
+	Cryptography(const char* password);
+	~Cryptography();
+	int encrypt(uint8_t* input_buffer, int32_t input_buffer_size);
+	int decrypt(uint8_t* input_buffer);
+	
+private:
+	uint8_t key[32] = { 0 };
+	uint8_t iv[16] = { 0 };
+	EVP_CIPHER_CTX* ctx = nullptr;
+
+	bool generate_key_and_iv_from_password(const char* password);
+	void handleErrors();
+};

Password_manager/include/win.h

@@ -0,0 +1,4 @@
+#pragma once
+
+bool put_data_on_clipboard(const char* text);
+std::string get_passwd();

Password_manager/source/cryptography.cpp

@@ -0,0 +1,127 @@
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include <string>
+#include <iostream>
+#include <fstream>
+
+#include "cryptography.h"
+#include "buffer.h"
+
+Cryptography::Cryptography(const char* password)
+{
+	OpenSSL_add_all_algorithms();
+	ERR_load_crypto_strings();
+
+	if (!generate_key_and_iv_from_password(password))
+	{
+		std::cout << "Error generating key and IV from password\n";
+		return;
+	}
+}
+
+Cryptography::~Cryptography()
+{
+	ERR_free_strings();
+	EVP_cleanup();
+}
+
+int Cryptography::encrypt(uint8_t* input_buffer, int32_t input_buffer_size)
+{
+	// Allocate memory for the ciphertext
+	int ciphertext_len = 0;
+	
+	Buffer encrypted_buffer(input_buffer_size + EVP_CIPHER_block_size(EVP_aes_256_cbc()));
+
+	// Create and initialize the context for encryption
+	ctx = EVP_CIPHER_CTX_new();
+	if (!ctx) handleErrors();
+
+	if (1 != EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv)) handleErrors();
+
+	// Perform encryption
+	if (1 != EVP_EncryptUpdate(ctx, encrypted_buffer.buffer, &ciphertext_len, input_buffer, input_buffer_size)) handleErrors();
+
+	int final_len;
+	if (1 != EVP_EncryptFinal_ex(ctx, encrypted_buffer.buffer + ciphertext_len, &final_len)) handleErrors();
+	ciphertext_len += final_len;
+
+	// Clean up the context 
+	EVP_CIPHER_CTX_free(ctx);
+
+
+	// store the encrypted buffer to file
+
+	std::ofstream file("encrypted_file.bin", std::ios::binary);
+	if (file) 
+	{
+		file.write((char*)encrypted_buffer.buffer, ciphertext_len);
+		file.close();
+	}
+
+
+
+	return ciphertext_len;
+}
+
+int Cryptography::decrypt(uint8_t* out_buffer)
+{
+	// read the encrypted buffer from file
+	
+
+
+	std::ifstream file("encrypted_file.bin", std::ios::binary);
+	if (!file) return 0;
+
+	file.seekg(0, std::ios::end);
+	int encrypted_buffer_len = file.tellg();
+	file.seekg(0, std::ios::beg);
+
+	Buffer encrypted_buffer(encrypted_buffer_len);
+
+	file.read((char*)encrypted_buffer.buffer, encrypted_buffer_len);
+	file.close();
+	
+	
+
+
+	
+
+
+	ctx = EVP_CIPHER_CTX_new();
+	if (!ctx) handleErrors();
+
+	if (1 != EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv)) handleErrors();
+
+	int decrypted_len = 0;
+	if (1 != EVP_DecryptUpdate(ctx, out_buffer, &decrypted_len, encrypted_buffer.buffer, encrypted_buffer_len)) handleErrors();
+	int final_len;
+	if (1 != EVP_DecryptFinal_ex(ctx, out_buffer + decrypted_len, &final_len)) handleErrors();
+	decrypted_len += final_len;
+
+	// Clean up the context
+	EVP_CIPHER_CTX_free(ctx);
+
+	return decrypted_len;
+}
+
+bool Cryptography::generate_key_and_iv_from_password(const char* password)
+{
+	int iterations = 10000;
+
+	// Derive key and IV using PBKDF2
+	if (1 != PKCS5_PBKDF2_HMAC(password, strlen(password), nullptr, 0, iterations, EVP_sha256(), 32, key)) return false;
+	if (1 != PKCS5_PBKDF2_HMAC(password, strlen(password), nullptr, 0, iterations, EVP_sha256(), 16, iv)) return false;
+	return true;
+}
+
+void Cryptography::handleErrors()
+{
+	EVP_CIPHER_CTX_free(ctx);
+
+	while (auto error = ERR_get_error())
+	{
+		char* error_string = ERR_error_string(error, nullptr);
+		std::cout << error_string << "\n";
+	}
+	abort();
+}

Password_manager/source/main.cpp

@@ -1,7 +1,6 @@
 #include <iostream>
 #include <fstream>
-
-#include "clipboard.hpp"
+#include "win.h"
 
 struct Pass
 {

Password_manager/source/win.cpp

@@ -1,6 +1,7 @@
 #include <Windows.h>
 #include <iostream>
-#include "clipboard.hpp"
+#include <string>
+#include "win.h"
 
 bool put_data_on_clipboard(const char* text) {
     int len = strlen(text);
@@ -36,3 +37,32 @@ bool put_data_on_clipboard(const char* text) {
     CloseClipboard();
     return true;
 }
+
+
+std::string get_passwd()
+{
+   
+    HANDLE hStdInput = GetStdHandle(STD_INPUT_HANDLE);
+    DWORD mode = 0;
+
+    // Create a restore point Mode
+    // is know 503
+    GetConsoleMode(hStdInput, &mode);
+
+    // Enable echo input
+    // set to 499
+    SetConsoleMode( hStdInput, mode & (~ENABLE_ECHO_INPUT));
+
+    // Take input
+    std::string ipt;
+    std::getline(std::cin, ipt);
+
+    // Otherwise next cout will print
+    // into the same line
+    std::cout << std::endl;
+
+    // Restore the mode
+    SetConsoleMode(hStdInput, mode);
+
+    return ipt;
+}