diff --git a/code/build/security/hash.cxx b/code/build/security/hash.cxx
index 8b642be..da5ff66 100644
--- a/code/build/security/hash.cxx
+++ b/code/build/security/hash.cxx
@@ -47,13 +47,13 @@ namespace code::build::security::hash
       throw runtime_error{"EVP_DigestFinal_ex() failure"};
     }
 
-    string output;
+    std::ostringstream o;
 
     for (unsigned int i{0}; i < length_of_hash; ++i) {
-      output.push_back(hash[i]);
+      o << std::setw(2) << std::setfill('0') << std::hex << (int)hash[i];
     }
 
-    return output;
+    return o.str();
   }
 
 } // namespace code::build::security::hash