implemented configurable checksum algorithm, defaults to sha256, introduces openssl dependency to build module

modules/build/include/checksums.hpp

@@ -0,0 +1,48 @@
+/**
+* @file checksums.hpp
+ * @brief Functions for generating cryptographic checksums
+ *
+ * Provides functionality for generating checksums of files using
+ * configurable cryptographic hash algorithms via OpenSSL.
+ *
+ * @copyright Copyright (c) 2025 SILO GROUP LLC
+ * @author Chris Punches <chris.punches@silogroup.org>
+ *
+ * Part of the Dark Horse Linux Package Manager (DPM)
+ */
+#pragma once
+
+#include <string>
+#include <filesystem>
+
+/**
+ * @brief Gets the configured hash algorithm or defaults to SHA-256
+ *
+ * Retrieves the hash algorithm configured in the cryptography section
+ * or defaults to SHA-256 if not specified.
+ *
+ * @return String containing the name of the hash algorithm to use
+ */
+std::string get_configured_hash_algorithm();
+
+/**
+ * @brief Gets a list of available digest algorithms from OpenSSL
+ *
+ * Retrieves a list of supported digest algorithms from OpenSSL's
+ * internal algorithms list.
+ *
+ * @return String containing comma-separated list of available algorithms
+ */
+std::string get_available_algorithms();
+
+/**
+ * @brief Generates a file checksum using the configured hashing algorithm
+ *
+ * Uses OpenSSL to calculate a cryptographic hash of a file's contents
+ * based on the algorithm specified in the configuration.
+ * This method reads the file in chunks to handle large files efficiently.
+ *
+ * @param file_path Path to the file to be hashed
+ * @return String containing the hexadecimal representation of the checksum, or empty string on error
+ */
+std::string generate_file_checksum(const std::filesystem::path& file_path);