Add header file

CMakeLists.txt

@@ -1,5 +1,5 @@
-cmake_minimum_required(VERSION 3.24) # Requires 3.24+ for URL-based FetchContent binaries
-project(OpenSSLExample CXX)
+cmake_minimum_required(VERSION 3.24)
+project(CryptoPDiddy CXX)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -9,7 +9,6 @@ include(FetchContent)
 
 if(WIN32)
     # Automatically downloads pre-built Windows OpenSSL binaries.
-    # The original placeholder URL "https://github.com" cannot be unpacked by FetchContent.
     FetchContent_Declare(
         openssl
         URL "https://github.com/TaurusTLS-Developers/OpenSSL-Distribution/releases/download/v3.5.6/openssl-3.5.6-Windows-x64.zip"
@@ -132,22 +131,20 @@ else()
     set(OPENSSL_SSL_LIB OpenSSL::SSL)
 endif()
 
-add_executable(crypto_app main.cpp)
+add_executable(EpstProject main.cpp CryptEpstein.h)
 
-# Link against the downloaded binaries
-target_include_directories(crypto_app PRIVATE "${OPENSSL_INCLUDE_DIR}")
-target_link_libraries(crypto_app PRIVATE "${OPENSSL_CRYPTO_LIB}" "${OPENSSL_SSL_LIB}")
+target_include_directories(EpstProject PRIVATE "${OPENSSL_INCLUDE_DIR}")
+target_link_libraries(EpstProject PRIVATE "${OPENSSL_CRYPTO_LIB}" "${OPENSSL_SSL_LIB}")
 
-# Copy DLL files to output directory so the executable can run
 if(WIN32)
     if(NOT OPENSSL_CRYPTO_DLL OR NOT OPENSSL_SSL_DLL)
         message(FATAL_ERROR "Downloaded OpenSSL package does not contain the expected DLL files.")
     endif()
 
-    add_custom_command(TARGET crypto_app POST_BUILD
+    add_custom_command(TARGET EpstProject POST_BUILD
         COMMAND ${CMAKE_COMMAND} -E copy_if_different
         "${OPENSSL_CRYPTO_DLL}"
         "${OPENSSL_SSL_DLL}"
-        $<TARGET_FILE_DIR:crypto_app>
+        $<TARGET_FILE_DIR:EpstProject>
     )
 endif()

CryptEpstein.h

@@ -0,0 +1,19 @@
+#pragma once
+#include <cstdio>
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include <openssl/evp.h>
+#include <openssl/pem.h>
+#include <openssl/rand.h>
+#include <openssl/rsa.h>
+
+// RAII
+struct PKEYDeleter { void operator()(EVP_PKEY* p) const { EVP_PKEY_free(p); } };
+struct CTXDeleter { void operator()(EVP_PKEY_CTX* p) const { EVP_PKEY_CTX_free(p); } };
+struct CipherDeleter { void operator()(EVP_CIPHER_CTX* ctx) const { EVP_CIPHER_CTX_free(ctx); } };
+struct BIODeleter { void operator()(BIO* b) const { BIO_free_all(b); } };

main.cpp

@@ -1,31 +1,14 @@
-#include <cstdint>
-#include <cstdio>
-#include <fstream>
-#include <iostream>
-#include <memory>
-#include <stdexcept>
-#include <string>
-#include <vector>
+#include "CryptEpstein.h"
 
-#include <openssl/evp.h>
-#include <openssl/pem.h>
-#include <openssl/rand.h>
-#include <openssl/rsa.h>
+using PRIVATE_KEY = std::unique_ptr<EVP_PKEY, PKEYDeleter>;
+using PUBLIC_KEY_CONTEXT = std::unique_ptr<EVP_PKEY_CTX, CTXDeleter>;
+using KEY_BIO = std::unique_ptr<BIO, BIODeleter>;
+using CIPHER_CONTEXT = std::unique_ptr<EVP_CIPHER_CTX, CipherDeleter>;
 
 #define DATA_WRITE(data) reinterpret_cast<const char*>(data)
 #define DATA_READ(data) reinterpret_cast<char*>(data)
 
 constexpr size_t BUFFER_SIZE = 4096;
-// RAII
-struct PKEYDeleter { void operator()(EVP_PKEY* p) const { EVP_PKEY_free(p); } };
-struct CTXDeleter  { void operator()(EVP_PKEY_CTX* p) const { EVP_PKEY_CTX_free(p); } };
-struct CipherDeleter { void operator()(EVP_CIPHER_CTX* ctx) const { EVP_CIPHER_CTX_free(ctx); } };
-struct BIODeleter { void operator()(BIO* b) const { BIO_free_all(b); } };
-
-typedef std::unique_ptr<EVP_PKEY, PKEYDeleter> PRIVATE_KEY;
-typedef std::unique_ptr<EVP_PKEY_CTX, CTXDeleter> PUBLIC_KEY_CONTEXT;
-typedef std::unique_ptr<BIO, BIODeleter> KEY_BIO;
-typedef std::unique_ptr<EVP_CIPHER_CTX, CipherDeleter> CIPTHER_CONTEXT;
 
 void generate_rsa_keypair(const std::string& private_key_path, const std::string& public_key_path) {
     // Initialize the context for key generation
@@ -130,7 +113,7 @@ void hybrid_encrypt(const std::string& input_path, const std::string& output_pat
     out_file.write(DATA_WRITE(iv), sizeof(iv));
 
     // Stream encrypt the actual file data via AES
-    CIPTHER_CONTEXT aes_ctx(EVP_CIPHER_CTX_new());
+    CIPHER_CONTEXT aes_ctx(EVP_CIPHER_CTX_new());
     if (!aes_ctx || EVP_EncryptInit_ex(aes_ctx.get(), EVP_aes_256_cbc(), nullptr, aes_key, iv) != 1) {
         throw std::runtime_error("AES init failed.");
     }
@@ -188,7 +171,7 @@ void hybrid_decrypt(const std::string& input_path, const std::string& output_pat
     aes_key.resize(aes_key_len);
 
     // Stream decrypt the file data using the recovered AES key
-    CIPTHER_CONTEXT aes_ctx(EVP_CIPHER_CTX_new());
+    CIPHER_CONTEXT aes_ctx(EVP_CIPHER_CTX_new());
     if (!aes_ctx || EVP_DecryptInit_ex(aes_ctx.get(), EVP_aes_256_cbc(), nullptr, aes_key.data(), iv) != 1) {
         throw std::runtime_error("AES decrypt init failed.");
     }