Adds the sdi_toolBox library (temporary version)

sdi_toolBox_1.0.x/toolBox/sdi_toolBox/crypto/digitalHash.h

@@ -0,0 +1,78 @@
+/*
+{{copyright}} 
+*/
+
+/*
+{{version}} 
+*/
+
+/*
+{{license}} 
+*/
+
+#pragma once
+
+#include <filesystem>
+#include <openssl/evp.h>
+#include <span>
+#include <string>
+
+namespace sdi_toolBox::crypto
+{
+//--------------------------------------------------------------
+class DigitalHash
+{
+  public:
+  DigitalHash()                                      = default;     // Default constructor
+  virtual ~DigitalHash()                             = default;     // Default destructor
+  DigitalHash(const DigitalHash &obj)                = delete;      // Copy constructor
+  DigitalHash(DigitalHash &&obj) noexcept            = delete;      // Move constructor
+  DigitalHash &operator=(const DigitalHash &obj)     = delete;      // Copy assignment operator
+  DigitalHash &operator=(DigitalHash &&obj) noexcept = delete;      // Move assignment operator
+
+  static std::string calculateDataHash(const std::span<const uint8_t> &data, const EVP_MD *md_type);     // Calculate digital hash from data buffer
+};
+//--------------------------------------------------------------
+/* Calculate digital hash from data buffer */
+inline std::string DigitalHash::calculateDataHash(const std::span<const uint8_t> &data, const EVP_MD *md_type)
+{
+  // Initialize OpenSSL digest context
+  EVP_MD_CTX *mdctx = EVP_MD_CTX_new();
+  if (!mdctx)
+    throw std::runtime_error("Error: Failed to create EVP_MD_CTX");
+
+  // Initialize digest operation
+  if (EVP_DigestInit_ex(mdctx, md_type, nullptr) != 1)
+  {
+    EVP_MD_CTX_free(mdctx);
+    throw std::runtime_error("Error: EVP_DigestInit_ex failed");
+  }
+
+  // Update digest with data
+  if (EVP_DigestUpdate(mdctx, data.data(), data.size()) != 1)
+  {
+    EVP_MD_CTX_free(mdctx);
+    throw std::runtime_error("Error: EVP_DigestUpdate failed");
+  }
+
+  // Finalize digest computation
+  std::vector<uint8_t> hash(EVP_MD_size(md_type));
+  unsigned int         hash_len = 0;
+  if (EVP_DigestFinal_ex(mdctx, hash.data(), &hash_len) != 1)
+  {
+    EVP_MD_CTX_free(mdctx);
+    throw std::runtime_error("Error: EVP_DigestFinal_ex failed");
+  }
+
+  // Clean up
+  EVP_MD_CTX_free(mdctx);
+
+  // Convert hash to hexadecimal string
+  std::string hash_hex;
+  for (unsigned int i = 0; i < hash_len; ++i)
+    hash_hex += std::format("{:02x}", hash[i]);
+
+  return hash_hex;
+}
+//--------------------------------------------------------------
+}     // namespace sdi_toolBox::crypto