diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index f566302..15f42d3 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -7,5 +7,6 @@ add_subdirectory(examples)
 # Build additional OpenBR utilities
 if(NOT ${BR_EMBEDDED})
   add_subdirectory(br-download)
+  add_subdirectory(br-enroll)
   add_subdirectory(br-gui)
 endif()
diff --git a/app/br-download/br-download.cpp b/app/br-download/br-download.cpp
index 66ca074..013f5d7 100644
--- a/app/br-download/br-download.cpp
+++ b/app/br-download/br-download.cpp
@@ -20,6 +20,7 @@
 #include <cstdio>
 #include <cstring>
 #include <string>
+#include <openbr/universal_template.h>
 
 using namespace cv;
 using namespace std;
@@ -62,17 +63,8 @@ static bool processReply(QNetworkReply* reply)
     static QMutex lock;
     QMutexLocker locker(&lock);
 
-    QFile file;
-    file.open(stdout, QFile::WriteOnly);
     const QByteArray hash = QCryptographicHash::hash(data, QCryptographicHash::Md5);
-    file.write(hash); // ImageID
-    file.write(hash); // TemplateID
-    const int32_t algorithmID = 3; // Encoded image
-    file.write((const char*) &algorithmID, 4); // AlgorithmID
-    const uint32_t size = data.size();
-    file.write((const char*) &size, 4); // Size
-    file.write(data);
-    file.flush();
+    br_append_utemplate_contents(stdout, reinterpret_cast<const int8_t*>(hash.data()), reinterpret_cast<const int8_t*>(hash.data()), 3, data.size(), reinterpret_cast<const int8_t*>(data.data()));
     return true;
 }
 
diff --git a/openbr/universal_template.cpp b/openbr/universal_template.cpp
index 7f18ed8..809b428 100644
--- a/openbr/universal_template.cpp
+++ b/openbr/universal_template.cpp
@@ -1,2 +1,37 @@
+#include <QFile>
+#include <cstdlib>
+#include <cstring>
+
 #include "universal_template.h"
 
+br_utemplate br_new_utemplate(const int8_t *imageID, const int8_t *templateID, int32_t algorithmID, uint32_t size, const int8_t *data)
+{
+    br_utemplate utemplate = (br_utemplate) malloc(sizeof(br_universal_template) + size);
+    memcpy(utemplate->imageID, imageID, 16);
+    memcpy(utemplate->templateID, templateID, 16);
+    utemplate->algorithmID = algorithmID;
+    utemplate->size = size;
+    memcpy(utemplate+1, data, size);
+    return utemplate;
+}
+
+void br_free_utemplate(br_const_utemplate utemplate)
+{
+    free((void*) utemplate);
+}
+
+void br_append_utemplate(FILE *file, br_const_utemplate utemplate)
+{
+    br_append_utemplate_contents(file, utemplate->imageID, utemplate->templateID, utemplate->algorithmID, utemplate->size, utemplate->data);
+}
+
+void br_append_utemplate_contents(FILE *file, const int8_t *imageID, const int8_t *templateID, int32_t algorithmID, uint32_t size, const int8_t *data)
+{
+    QFile qFile;
+    qFile.open(file, QFile::WriteOnly | QFile::Append);
+    qFile.write((const char*) imageID, 16);
+    qFile.write((const char*) templateID, 16);
+    qFile.write((const char*) &algorithmID, 4);
+    qFile.write((const char*) &size, 4);
+    qFile.write((const char*) data, size);
+}
diff --git a/openbr/universal_template.h b/openbr/universal_template.h
index ba6011a..dbdcff7 100644
--- a/openbr/universal_template.h
+++ b/openbr/universal_template.h
@@ -17,18 +17,55 @@
 #ifndef BR_UNIVERSAL_TEMPLATE_H
 #define BR_UNIVERSAL_TEMPLATE_H
 
+#include <stdio.h>
 #include <stdint.h>
+#include <openbr/openbr_export.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 /*!
  * \brief A flat template format for representing arbitrary feature vectors.
  */
 struct br_universal_template
 {
-    uint8_t  imageID[16];    /*!< MD5 hash of the undecoded origin file. */
-    uint8_t  templateID[16]; /*!< MD5 hash of _data_. */
+    int8_t   imageID[16];    /*!< MD5 hash of the undecoded origin file. */
+    int8_t   templateID[16]; /*!< MD5 hash of _data_. */
     int32_t  algorithmID;    /*!< type of _data_. */
     uint32_t size;           /*!< length of _data_. */
-    uint8_t  data[];         /*!< _size_-byte buffer. */
+    int8_t   data[];         /*!< _size_-byte buffer. */
 };
 
+typedef struct br_universal_template *br_utemplate;
+typedef const struct br_universal_template *br_const_utemplate;
+
+/*!
+ * \brief br_universal_template constructor.
+ * \see br_free_utemplate
+ */
+BR_EXPORT br_utemplate br_new_utemplate(const int8_t *imageID, const int8_t *templateID, int32_t algorithmID, uint32_t size, const int8_t *data);
+
+/*!
+ * \brief br_universal_template destructor.
+ * \see br_new_utemplate
+ */
+BR_EXPORT void br_free_utemplate(br_const_utemplate utemplate);
+
+/*!
+ * \brief Serialize a br_universal_template to a file.
+ * \see br_append_utemplate_contents
+ */
+BR_EXPORT void br_append_utemplate(FILE *file, br_const_utemplate utemplate);
+
+/*!
+ * \brief Serialize a br_universal_template to a file.
+ * \see br_append_utemplate
+ */
+BR_EXPORT void br_append_utemplate_contents(FILE *file, const int8_t *imageID, const int8_t *templateID, int32_t algorithmID, uint32_t size, const int8_t *data);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif // BR_UNIVERSAL_TEMPLATE_H