peternewman · Aug 24, 2026 · Aug 28, 2026 · Aug 28, 2026 · Aug 28, 2026 · Aug 30, 2026
diff --git a/common/Makefile.mk b/common/Makefile.mk
@@ -13,6 +13,7 @@ common_libolacommon_la_LIBADD += -lWs2_32 -lIphlpapi
 endif
 
 include common/base/Makefile.mk
+include common/crypto/Makefile.mk
 include common/dmx/Makefile.mk
 include common/export_map/Makefile.mk
 include common/file/Makefile.mk

diff --git a/common/crypto/HMAC.cpp b/common/crypto/HMAC.cpp
@@ -0,0 +1,46 @@
+/*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * HMAC.cpp
+ * HMAC Crypto functions.
+ * Copyright (C) 2026 Peter Newman
+ */
+
+#include "ola/crypto/HMAC.h"
+
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
+#include "ola/Logging.h"
+
+namespace ola {
+namespace crypto {
+
+bool HMACSHA256(const uint8_t *key,
+                const unsigned int key_length,
+                const uint8_t *data,
+                const unsigned int data_length,
+                uint8_t *hmac,
+                unsigned int *hmac_length) {
+  /*HMAC_CTX ctx;
+  HMAC_Init(&ctx, key, key_length, );
+  HMAC_Update(&ctx, data, data_length);
+  HMAC_Final(&ctx, hmac, hmac_length);
+  HMAC_cleanup(&ctx);*/
+  HMAC(EVP_sha256(), key, key_length, data, data_length, hmac, hmac_length);
+
+  return true;
+}
+}  // namespace crypto
+}  // namespace ola
diff --git a/common/crypto/HMACTest.cpp b/common/crypto/HMACTest.cpp
@@ -0,0 +1,68 @@
+/*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * HMACTest.cpp
+ * Unittest for HMAC Crypto functions.
+ * Copyright (C) 2026 Peter Newman
+ */
+
+#include <cppunit/extensions/HelperMacros.h>
+
+#include "ola/crypto/HMAC.h"
+#include "ola/testing/TestUtils.h"
+
+using ola::crypto::HMACSHA256;
+
+class HMACTest: public CppUnit::TestFixture {
+  CPPUNIT_TEST_SUITE(HMACTest);
+  CPPUNIT_TEST(testHMACSHA256);
+  CPPUNIT_TEST_SUITE_END();
+
+ public:
+    void testHMACSHA256();
+};
+
+
+CPPUNIT_TEST_SUITE_REGISTRATION(HMACTest);
+
+/*
+ * Test the HMACSHA256 function
+ */
+void HMACTest::testHMACSHA256() {
+  // RFC 4231 - Test Case 1
+  // uint8_t hmac[EVP_MAX_MD_SIZE];
+  uint8_t hmac[100];
+  unsigned int len = 0;
+
+  const uint8_t key[] = {
+    0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+    0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+    0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+    0x0b, 0x0b, 0x0b, 0x0b, 0x0b
+  };
+
+  const uint8_t data[] = { 'H', 'i', ' ', 'T', 'h', 'e', 'r', 'e' };
+
+  uint8_t expected_hmac[32] = {
+    0xB0, 0x34, 0x4C, 0x61, 0xD8, 0xDB, 0x38, 0x53,
+    0x5C, 0xA8, 0xAF, 0xCE, 0xAF, 0x0B, 0xF1, 0x2B,
+    0x88, 0x1D, 0xC2, 0x00, 0xC9, 0x83, 0x3D, 0xA7,
+    0x26, 0xE9, 0x37, 0x6C, 0x2E, 0x32, 0xCF, 0xF7
+  };
+
+  OLA_ASSERT_TRUE(HMACSHA256(key, sizeof(key), data, sizeof(data), hmac, &len));
+  OLA_ASSERT_DATA_EQUALS(expected_hmac, sizeof(expected_hmac),
+                         hmac, len);
+}
diff --git a/common/crypto/Makefile.mk b/common/crypto/Makefile.mk
@@ -0,0 +1,27 @@
+# LIBRARIES
+##################################################
+if HAVE_LIBCRYPTO
+noinst_LTLIBRARIES += common/crypto/libolacrypto.la
+common_crypto_libolacrypto_la_SOURCES = \
+    common/crypto/HMAC.cpp
+common_crypto_libolacrypto_la_LIBADD = $(libcrypto_LIBS)
+
+# TODO(Peter): Fixme for Windows
+# if USING_WIN32
+# Work around limitations with Windows library linking
+# common_crypto_libolacrypto_la_LIBADD = common/libolacommon.la
+# endif
+
+# TESTS
+################################################
+test_programs += common/crypto/HMACTester
+
+COMMON_CRYPTO_TEST_LDADD = $(COMMON_TESTING_LIBS) \
+                           common/crypto/libolacrypto.la
+
+common_crypto_HMACTester_SOURCES = \
+    common/crypto/HMACTest.cpp
+common_crypto_HMACTester_CXXFLAGS = $(COMMON_TESTING_FLAGS)
+common_crypto_HMACTester_LDADD = $(COMMON_CRYPTO_TEST_LDADD)
+endif
+
diff --git a/common/protocol/Ola.proto b/common/protocol/Ola.proto
@@ -68,6 +68,9 @@ enum PluginIds {
   OLA_PLUGIN_GPIO = 22;
   OLA_PLUGIN_SPIDMX = 23;
   OLA_PLUGIN_NANOLEAF = 24;
+  OLA_PLUGIN_E133 = 25;
+  OLA_PLUGIN_LLRP = 26;
+  OLA_PLUGIN_SIGNET = 27;
 
   /*
    * To obtain a new plugin ID, open a ticket at

diff --git a/configure.ac b/configure.ac
@@ -760,6 +760,28 @@ AS_IF([test "x$enable_osc" != xno],
 AS_IF([test "x$have_liblo" = xyes],
       [AC_DEFINE([HAVE_LIBLO], [1], [define if liblo is installed])])
 
+# COAP Support.
+# look for libcoap if the user asked us to
+AC_ARG_ENABLE(
+  [signet],
+  [AS_HELP_STRING([--disable-signet],
+                  [Disable the Sig-Net plugin even if libcoap exists])])
+
+have_libcoap="no"
+#AS_IF([test "x$enable_signet" != xno],
+#      [PKG_CHECK_MODULES(libcoap, [libcoap-1 >= 4.1.2], [have_libcoap="yes"], [true])])
+AS_IF([test "x$enable_signet" != xno],
+      [PKG_CHECK_MODULES(libcoap, [libcoap-2 >= 4.2.1], [have_libcoap="yes"], [true])])
+AS_IF([test "x$have_libcoap" = xyes],
+      [AC_DEFINE([HAVE_LIBCOAP], [1], [define if libcoap is installed])])
+
+have_libcrypto="no"
+AS_IF([test "x$enable_signet" != xno],
+      [PKG_CHECK_MODULES(libcrypto, [libcrypto >= 1.0.2g], [have_libcrypto="yes"], [true])])
+AM_CONDITIONAL([HAVE_LIBCRYPTO], [test "x$have_libcrypto" = xyes])
+AS_IF([test "x$have_libcrypto" = xyes],
+      [AC_DEFINE([HAVE_LIBCRYPTO], [1], [define if libcrypto is installed])])
+
 # Python API
 AC_ARG_ENABLE(
   [python-libs],
@@ -920,6 +942,7 @@ PLUGIN_SUPPORT(pathport, USE_PATHPORT)
 PLUGIN_SUPPORT(renard, USE_RENARD)
 PLUGIN_SUPPORT(sandnet, USE_SANDNET)
 PLUGIN_SUPPORT(shownet, USE_SHOWNET)
+PLUGIN_SUPPORT(signet, USE_SIGNET, [$have_libcoap])
 PLUGIN_SUPPORT(spi, USE_SPI, [$have_spi])
 PLUGIN_SUPPORT(spidmx, USE_SPIDMX, [$have_spi])
 PLUGIN_SUPPORT(stageprofi, USE_STAGEPROFI)

diff --git a/include/ola/Makefile.mk b/include/ola/Makefile.mk
@@ -1,6 +1,7 @@
 include include/ola/acn/Makefile.mk
 include include/ola/base/Makefile.mk
 include include/ola/client/Makefile.mk
+include include/ola/crypto/Makefile.mk
 include include/ola/dmx/Makefile.mk
 include include/ola/e133/Makefile.mk
 include include/ola/file/Makefile.mk

diff --git a/include/ola/crypto/HMAC.h b/include/ola/crypto/HMAC.h
@@ -0,0 +1,52 @@
+/*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * HMAC.h
+ * HMAC Crypto functions.
+ * Copyright (C) 2026 Peter Newman
+ */
+
+/**
+ * @file ola/crypto/HMAC.h
+ * @brief HMAC crypto functions
+ */
+
+#ifndef INCLUDE_OLA_CRYPTO_HMAC_H_
+#define INCLUDE_OLA_CRYPTO_HMAC_H_
+
+#include <stdint.h>
+
+namespace ola {
+namespace crypto {
+
+/**
+ * @brief Generate the SHA256 HMAC of some data.
+ * @param[in] key pointer to the key
+ * @param[in] key_length length of the key
+ * @param[in] data pointer to the data to generate the HMAC of
+ * @param[in] data_length length of the data to generate the HMAC of
+ * @param[out] hmac pointer to where the HMAC will be stored
+ * @param[out] hmac_length pointer to where the length of the generated HMAC
+ *   will be stored
+ */
+bool HMACSHA256(const uint8_t *key,
+                const unsigned int key_length,
+                const uint8_t *data,
+                const unsigned int data_length,
+                uint8_t *hmac,
+                unsigned int *hmac_length);
+}  // namespace crypto
+}  // namespace ola
+#endif  // INCLUDE_OLA_CRYPTO_HMAC_H_
diff --git a/include/ola/crypto/Makefile.mk b/include/ola/crypto/Makefile.mk
@@ -0,0 +1,3 @@
+olacryptoincludedir = $(pkgincludedir)/crypto/
+olacryptoinclude_HEADERS = \
+    include/ola/crypto/HMAC.h
diff --git a/include/ola/rdm/RDMCommand.h b/include/ola/rdm/RDMCommand.h
@@ -181,7 +181,7 @@ class RDMCommand {
 
   /**
    * @brief Extract a RDMCommand from raw data.
-   * @param data The data excluding the state code.
+   * @param data The data excluding the start code.
    * @param length The length of the data.
    * @returns NULL if the RDM command is invalid.
    */

diff --git a/olad/DynamicPluginLoader.cpp b/olad/DynamicPluginLoader.cpp
@@ -91,6 +91,10 @@
 #include "plugins/shownet/ShowNetPlugin.h"
 #endif  // USE_SHOWNET
 
+#ifdef USE_SIGNET
+#include "plugins/signet/SigNetPlugin.h"
+#endif  // USE_SIGNET
+
 #ifdef USE_SPI
 #include "plugins/spi/SPIPlugin.h"
 #endif  // USE_SPI
@@ -216,6 +220,11 @@ void DynamicPluginLoader::PopulatePlugins() {
       new ola::plugin::shownet::ShowNetPlugin(m_plugin_adaptor));
 #endif  // USE_SHOWNET
 
+#ifdef USE_SIGNET
+  m_plugins.push_back(
+      new ola::plugin::signet::SigNetPlugin(m_plugin_adaptor));
+#endif  // USE_SIGNET
+
 #ifdef USE_SPI
   m_plugins.push_back(
       new ola::plugin::spi::SPIPlugin(m_plugin_adaptor));

diff --git a/olad/Makefile.mk b/olad/Makefile.mk
@@ -42,6 +42,10 @@ ola_server_sources += olad/HttpServerActions.cpp \
 ola_server_additional_libs += common/http/libolahttp.la
 endif
 
+if HAVE_LIBCRYPTO
+ola_server_additional_libs += common/crypto/libolacrypto.la
+endif
+
 # lib olaserver
 lib_LTLIBRARIES += olad/libolaserver.la
 

diff --git a/plugins/Makefile.mk b/plugins/Makefile.mk
@@ -14,6 +14,7 @@ include plugins/pathport/Makefile.mk
 include plugins/renard/Makefile.mk
 include plugins/sandnet/Makefile.mk
 include plugins/shownet/Makefile.mk
+include plugins/signet/Makefile.mk
 include plugins/spi/Makefile.mk
 include plugins/spidmx/Makefile.mk
 include plugins/stageprofi/Makefile.mk

diff --git a/plugins/signet/Makefile.mk b/plugins/signet/Makefile.mk
@@ -0,0 +1,37 @@
+# LIBRARIES
+##################################################
+if USE_SIGNET
+# This is a library which isn't coupled to olad
+noinst_LTLIBRARIES += plugins/signet/libolasignetnode.la
+plugins_signet_libolasignetnode_la_SOURCES = \
+    plugins/signet/SigNetEnums.h \
+    plugins/signet/SigNetNode.cpp \
+    plugins/signet/SigNetNode.h \
+    plugins/signet/SigNetTIDs.h
+plugins_signet_libolasignetnode_la_CXXFLAGS = $(COMMON_CXXFLAGS) $(libcoap_CFLAGS)
+plugins_signet_libolasignetnode_la_LIBADD = $(libcoap_LIBS)
+
+lib_LTLIBRARIES += plugins/signet/libolasignet.la
+
+# Plugin description is generated from README.md
+built_sources += plugins/signet/SigNetPluginDescription.h
+nodist_plugins_signet_libolasignet_la_SOURCES = \
+    plugins/signet/SigNetPluginDescription.h
+plugins/signet/SigNetPluginDescription.h: plugins/signet/README.md plugins/signet/Makefile.mk plugins/convert_README_to_header.sh
+	sh $(top_srcdir)/plugins/convert_README_to_header.sh $(top_srcdir)/plugins/signet $(top_builddir)/plugins/signet/SigNetPluginDescription.h
+
+plugins_signet_libolasignet_la_SOURCES = \
+    plugins/signet/SigNetDevice.cpp \
+    plugins/signet/SigNetDevice.h \
+    plugins/signet/SigNetPlugin.cpp \
+    plugins/signet/SigNetPlugin.h \
+    plugins/signet/SigNetPort.cpp \
+    plugins/signet/SigNetPort.h
+plugins_signet_libolasignet_la_CXXFLAGS = $(COMMON_CXXFLAGS) $(libcoap_CFLAGS)
+plugins_signet_libolasignet_la_LIBADD = \
+    olad/plugin_api/libolaserverplugininterface.la \
+    plugins/signet/libolasignetnode.la
+endif
+
+EXTRA_DIST += \
+    plugins/signet/README.md
diff --git a/plugins/signet/README.md b/plugins/signet/README.md
@@ -0,0 +1,17 @@
+Sig-Net Plugin
+===============================
+
+This plugin allows OLA to send and receive
+[Sig-Net](https://sig-net.net/) messages.
+
+
+## Config file: `ola-signet.conf`
+
+`input_ports = <int>`  
+The number of input ports to create.
+
+`output_ports = <int>`  
+The number of output ports to create.
+
+`udp_listen_port = <int>`
+The UDP Port to listen on for Sig-Net messages.