diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..05450b4
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,78 @@
+if (MSVC)
+ cmake_minimum_required(VERSION 3.26)
+else()
+ cmake_minimum_required(VERSION 3.15)
+endif() 
+set(CMAKE_BUILD_TYPE Debug)
+project (nostril C)
+
+include_directories(${CMAKE_SOURCE_DIR}/ext/secp256k1/include)
+add_subdirectory(${CMAKE_SOURCE_DIR}/ext/secp256k1)
+
+#//////////////////////////
+#windows.h header file has macros for min and max, nostril defines max
+#//////////////////////////
+
+if (MSVC)
+  add_definitions(-DNOMINMAX)
+  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+  add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
+endif()
+
+#//////////////////////////
+#sources 
+#//////////////////////////
+
+set(src ${src})
+set(src ${src} hex.h)
+set(src ${src} proof.h)
+set(src ${src} cursor.h)
+set(src ${src} endian.h)
+set(src ${src} random.h)
+set(src ${src} sha256.h)
+set(src ${src} sha256.c)
+set(src ${src} base64.h)
+set(src ${src} base64.c)
+set(src ${src} aes.h)
+set(src ${src} aes.c)
+if (MSVC)
+  set(src ${src} clock_gettime.h)
+endif()
+
+#//////////////////////////
+#link with libraries
+#lib_dep contains a cascade definition of all the libraries needed to link
+#//////////////////////////
+
+set(lib_dep ${lib_dep})
+if (MSVC)
+  set(lib_dep ${lib_dep} ${CMAKE_BINARY_DIR}/ext/secp256k1/src/Debug/libsecp256k1.lib)
+  set(lib_dep ${lib_dep} Bcrypt.lib)
+else()
+  set(lib_dep ${lib_dep} ${CMAKE_BINARY_DIR}/ext/secp256k1/src/libsecp256k1.a)
+endif()
+
+
+#//////////////////////////
+#executables
+#//////////////////////////
+
+# tool to generate file 'config.h' , generate from a shell with 
+# configurator.exe > config.h
+add_executable(configurator configurator.c)
+
+add_executable(nostril ${src} nostril.c)
+target_link_libraries (nostril ${lib_dep})
+
+#//////////////////////////
+# generate  config.h
+#//////////////////////////
+
+add_custom_command(
+    TARGET configurator
+    POST_BUILD
+    COMMAND configurator > config.h 
+    COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_BINARY_DIR}/config.h" ${CMAKE_SOURCE_DIR}
+    COMMENT "generating config.h"
+)
+
diff --git a/base64.h b/base64.h
index cef30d2..fb37d49 100644
--- a/base64.h
+++ b/base64.h
@@ -6,6 +6,18 @@
 #include <stdbool.h>
 #include <sys/types.h>
 
+#if defined(_MSC_VER)
+#ifndef _SSIZE_T_DEFINED
+#ifdef  _WIN64
+typedef unsigned __int64    ssize_t;
+#else
+typedef _W64 unsigned int   ssize_t;
+#endif
+#define _SSIZE_T_DEFINED
+#endif
+#endif
+
+
 /**
  * base64_maps_t - structure to hold maps for encode/decode
  */
diff --git a/build.cmake.sh b/build.cmake.sh
new file mode 100644
index 0000000..d680d29
--- /dev/null
+++ b/build.cmake.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+mkdir -p build
+pushd build
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+cmake ..
+cmake --build . --target configurator
+pushd ext
+pushd secp256k1
+make
+popd
+popd
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+cmake ..
+pushd ext
+pushd secp256k1
+make
+popd
+popd
+elif [[ "$OSTYPE" == "msys" ]]; then
+cmake .. --fresh
+fi
+sleep 1
+cmake --build .
+popd
+exit
+
diff --git a/clock_gettime.h b/clock_gettime.h
new file mode 100644
index 0000000..b3f5a62
--- /dev/null
+++ b/clock_gettime.h
@@ -0,0 +1,39 @@
+#ifndef CLOCK_GETTIME_H_
+#define CLOCK_GETTIME_H_
+
+#include <windows.h>
+
+#define MS_PER_SEC      1000ULL     // MS = milliseconds
+#define US_PER_MS       1000ULL     // US = microseconds
+#define HNS_PER_US      10ULL       // HNS = hundred-nanoseconds (e.g., 1 hns = 100 ns)
+#define NS_PER_US       1000ULL
+#define HNS_PER_SEC     (MS_PER_SEC * US_PER_MS * HNS_PER_US)
+#define NS_PER_HNS      (100ULL)    // NS = nanoseconds
+#define NS_PER_SEC      (MS_PER_SEC * US_PER_MS * NS_PER_US)
+
+int clock_gettime(int X, struct timespec* tv)
+{
+  static LARGE_INTEGER ticksPerSec;
+  LARGE_INTEGER ticks;
+
+  if (!ticksPerSec.QuadPart)
+  {
+    QueryPerformanceFrequency(&ticksPerSec);
+    if (!ticksPerSec.QuadPart)
+    {
+      errno = ENOTSUP;
+      return -1;
+    }
+  }
+
+  QueryPerformanceCounter(&ticks);
+
+  tv->tv_sec = (long)(ticks.QuadPart / ticksPerSec.QuadPart);
+  tv->tv_nsec = (long)(((ticks.QuadPart % ticksPerSec.QuadPart) * NS_PER_SEC) / ticksPerSec.QuadPart);
+
+  return 0;
+}
+
+
+
+#endif
\ No newline at end of file
diff --git a/configurator.c b/configurator.c
index 68d7fc6..b22e4ea 100644
--- a/configurator.c
+++ b/configurator.c
@@ -37,7 +37,11 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef _MSC_VER
+#define sleep Sleep
+#else
 #include <unistd.h>
+#endif
 
 #ifdef _MSC_VER
 #define popen _popen
diff --git a/cursor.h b/cursor.h
index c9b5fe7..e682f8f 100644
--- a/cursor.h
+++ b/cursor.h
@@ -6,8 +6,19 @@
 #include <assert.h>
 #include <string.h>
 
+#ifdef _MSC_VER
+# pragma warning(push)
+# pragma warning(disable: 4005) 
+# pragma warning(disable: 4477) 
+#endif
+
+#ifdef _MSC_VER
+#define unlikely
+#define likely
+#else
 #define unlikely(x) __builtin_expect((x),0)
 #define likely(x)   __builtin_expect((x),1)
+#endif 
 
 struct cursor {
 	unsigned char *start;
diff --git a/nostril.c b/nostril.c
index 58111fd..5bd279e 100644
--- a/nostril.c
+++ b/nostril.c
@@ -5,7 +5,15 @@
 #include <assert.h>
 #include <errno.h>
 #include <inttypes.h>
+#ifdef _MSC_VER
+#else
 #include <unistd.h>
+#endif
+
+#ifdef _MSC_VER
+#include "clock_gettime.h"
+#define CLOCK_MONOTONIC 0
+#endif
 
 #include "secp256k1.h"
 #include "secp256k1_ecdh.h"
@@ -639,7 +647,11 @@ static int make_encrypted_dm(secp256k1_context *ctx, struct key *key,
 	unsigned char iv[16];
 	unsigned char compressed_pubkey[33];
 	int content_len = strlen(ev->content);
+#ifdef _MSC_VER
+	unsigned char* encbuf = malloc(content_len + (content_len % 16) + 1);
+#else
 	unsigned char encbuf[content_len + (content_len % 16) + 1];
+#endif
 	struct cursor cur;
 	secp256k1_pubkey pubkey;
 
@@ -714,6 +726,9 @@ static int make_encrypted_dm(secp256k1_context *ctx, struct key *key,
 
 	cur.p += 65;
 
+#ifdef _MSC_VER
+	free(encbuf);
+#endif
 	return 1;
 }