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diff --git a/lib/openssl/crypto/threads_win.c b/lib/openssl/crypto/threads_win.c
new file mode 100644
index 0000000..4e0de90
--- /dev/null
+++ b/lib/openssl/crypto/threads_win.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#if defined(_WIN32)
+# include <windows.h>
+#endif
+
+#include <openssl/crypto.h>
+
+#if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && defined(OPENSSL_SYS_WINDOWS)
+
+CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
+{
+    CRYPTO_RWLOCK *lock = OPENSSL_zalloc(sizeof(CRITICAL_SECTION));
+    if (lock == NULL)
+        return NULL;
+
+    /* 0x400 is the spin count value suggested in the documentation */
+    if (!InitializeCriticalSectionAndSpinCount(lock, 0x400)) {
+        OPENSSL_free(lock);
+        return NULL;
+    }
+
+    return lock;
+}
+
+int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
+{
+    EnterCriticalSection(lock);
+    return 1;
+}
+
+int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
+{
+    EnterCriticalSection(lock);
+    return 1;
+}
+
+int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
+{
+    LeaveCriticalSection(lock);
+    return 1;
+}
+
+void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
+{
+    if (lock == NULL)
+        return;
+
+    DeleteCriticalSection(lock);
+    OPENSSL_free(lock);
+
+    return;
+}
+
+#  define ONCE_UNINITED     0
+#  define ONCE_ININIT       1
+#  define ONCE_DONE         2
+
+/*
+ * We don't use InitOnceExecuteOnce because that isn't available in WinXP which
+ * we still have to support.
+ */
+int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
+{
+    LONG volatile *lock = (LONG *)once;
+    LONG result;
+
+    if (*lock == ONCE_DONE)
+        return 1;
+
+    do {
+        result = InterlockedCompareExchange(lock, ONCE_ININIT, ONCE_UNINITED);
+        if (result == ONCE_UNINITED) {
+            init();
+            *lock = ONCE_DONE;
+            return 1;
+        }
+    } while (result == ONCE_ININIT);
+
+    return (*lock == ONCE_DONE);
+}
+
+int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
+{
+    *key = TlsAlloc();
+    if (*key == TLS_OUT_OF_INDEXES)
+        return 0;
+
+    return 1;
+}
+
+void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
+{
+    return TlsGetValue(*key);
+}
+
+int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
+{
+    if (TlsSetValue(*key, val) == 0)
+        return 0;
+
+    return 1;
+}
+
+int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
+{
+    if (TlsFree(*key) == 0)
+        return 0;
+
+    return 1;
+}
+
+CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
+{
+    return GetCurrentThreadId();
+}
+
+int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
+{
+    return (a == b);
+}
+
+int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
+{
+    *ret = InterlockedExchangeAdd(val, amount) + amount;
+    return 1;
+}
+
+#endif