diff --git a/ixcobra/CMakeLists.txt b/ixcobra/CMakeLists.txt
index f7245cbd..48d2df22 100644
--- a/ixcobra/CMakeLists.txt
+++ b/ixcobra/CMakeLists.txt
@@ -22,9 +22,9 @@ add_library(ixcobra STATIC
 
 set(IXCOBRA_INCLUDE_DIRS
     .
+    ..
     ../ixcore
     ../ixcrypto
-    ../ixwebsocket
     ../third_party)
 
 target_include_directories( ixcobra PUBLIC ${IXCOBRA_INCLUDE_DIRS} )
diff --git a/ixcrypto/CMakeLists.txt b/ixcrypto/CMakeLists.txt
index 420c0937..c9ae5497 100644
--- a/ixcrypto/CMakeLists.txt
+++ b/ixcrypto/CMakeLists.txt
@@ -2,18 +2,19 @@
 # Author: Benjamin Sergeant
 # Copyright (c) 2019 Machine Zone, Inc. All rights reserved.
 #
+set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../CMake;${CMAKE_MODULE_PATH}")
 
 set (IXCRYPTO_SOURCES
     ixcrypto/IXHMac.cpp
     ixcrypto/IXBase64.cpp
-    ixcrypto/IXUUid.cpp
+    ixcrypto/IXUuid.cpp
     ixcrypto/IXHash.cpp
 )
 
 set (IXCRYPTO_HEADERS
     ixcrypto/IXHMac.h
     ixcrypto/IXBase64.h
-    ixcrypto/IXUUid.h
+    ixcrypto/IXUuid.h
     ixcrypto/IXHash.h
 )
 
@@ -27,3 +28,27 @@ set(IXCRYPTO_INCLUDE_DIRS
     ../ixcore)
 
 target_include_directories( ixcrypto PUBLIC ${IXCRYPTO_INCLUDE_DIRS} )
+
+# hmac computation needs a crypto library
+
+if (WIN32)
+  set(USE_MBED_TLS TRUE)
+endif()
+
+target_compile_definitions(ixcrypto PUBLIC IXCRYPTO_USE_TLS)
+if (USE_MBED_TLS)
+    find_package(MbedTLS REQUIRED)
+    target_include_directories(ixcrypto PUBLIC ${MBEDTLS_INCLUDE_DIRS})
+    target_link_libraries(ixcrypto ${MBEDTLS_LIBRARIES})
+    target_compile_definitions(ixcrypto PUBLIC IXCRYPTO_USE_MBED_TLS)
+elseif (APPLE)
+elseif (WIN32)
+else()
+    find_package(OpenSSL REQUIRED)
+    add_definitions(${OPENSSL_DEFINITIONS})
+    message(STATUS "OpenSSL: " ${OPENSSL_VERSION})
+    include_directories(${OPENSSL_INCLUDE_DIR})
+    target_link_libraries(ixcrypto ${OPENSSL_LIBRARIES})
+    target_compile_definitions(ixcrypto PUBLIC IXCRYPTO_USE_OPEN_SSL)
+endif()
+
diff --git a/ixcrypto/ixcrypto/IXHMac.cpp b/ixcrypto/ixcrypto/IXHMac.cpp
index 08e07f52..4e203d36 100644
--- a/ixcrypto/ixcrypto/IXHMac.cpp
+++ b/ixcrypto/ixcrypto/IXHMac.cpp
@@ -7,12 +7,14 @@
 #include "IXHMac.h"
 #include "IXBase64.h"
 
-#if defined(IXWEBSOCKET_USE_MBED_TLS)
+#if defined(IXCRYPTO_USE_MBED_TLS)
 # include <mbedtls/md.h>
 #elif defined(__APPLE__)
 # include <CommonCrypto/CommonHMAC.h>
-#else
+#elif defined(IXCRYPTO_USE_OPEN_SSL)
 # include <openssl/hmac.h>
+#else
+# error "Unsupported configuration"
 #endif
 
 namespace ix
@@ -22,7 +24,7 @@ namespace ix
         constexpr size_t hashSize = 16;
         unsigned char hash[hashSize];
 
-#if defined(IXWEBSOCKET_USE_MBED_TLS)
+#if defined(IXCRYPTO_USE_MBED_TLS)
         mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_MD5),
                (unsigned char *) key.c_str(), key.size(),
                (unsigned char *) data.c_str(), data.size(),
@@ -32,11 +34,13 @@ namespace ix
                key.c_str(), key.size(),
                data.c_str(), data.size(),
                &hash);
-#else
+#elif defined(IXCRYPTO_USE_OPEN_SSL)
         HMAC(EVP_md5(),
              key.c_str(), (int) key.size(),
              (unsigned char *) data.c_str(), (int) data.size(),
              (unsigned char *) hash, nullptr);
+#else
+#       error "Unsupported configuration"
 #endif
 
         std::string hashString(reinterpret_cast<char*>(hash), hashSize);