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diff --git a/lib/openssl/test/sanitytest.c b/lib/openssl/test/sanitytest.c
new file mode 100644
index 0000000..9c968f4
--- /dev/null
+++ b/lib/openssl/test/sanitytest.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2015-2016 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
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <internal/numbers.h>
+
+
+#define TEST(e) \
+    do { \
+        if (!(e)) { \
+            fprintf(stderr, "Failed " #e "\n"); \
+            failures++; \
+        } \
+    } while (0)
+
+
+enum smallchoices { sa, sb, sc };
+enum medchoices { ma, mb, mc, md, me, mf, mg, mh, mi, mj, mk, ml };
+enum largechoices {
+    a01, b01, c01, d01, e01, f01, g01, h01, i01, j01,
+    a02, b02, c02, d02, e02, f02, g02, h02, i02, j02,
+    a03, b03, c03, d03, e03, f03, g03, h03, i03, j03,
+    a04, b04, c04, d04, e04, f04, g04, h04, i04, j04,
+    a05, b05, c05, d05, e05, f05, g05, h05, i05, j05,
+    a06, b06, c06, d06, e06, f06, g06, h06, i06, j06,
+    a07, b07, c07, d07, e07, f07, g07, h07, i07, j07,
+    a08, b08, c08, d08, e08, f08, g08, h08, i08, j08,
+    a09, b09, c09, d09, e09, f09, g09, h09, i09, j09,
+    a10, b10, c10, d10, e10, f10, g10, h10, i10, j10,
+    xxx };
+
+int main()
+{
+    char *p;
+    char bytes[sizeof(p)];
+    int failures = 0;
+
+    /* Is NULL equivalent to all-bytes-zero? */
+    p = NULL;
+    memset(bytes, 0, sizeof bytes);
+    TEST(memcmp(&p, bytes, sizeof(bytes)) == 0);
+
+    /* Enum size */
+    TEST(sizeof(enum smallchoices) == sizeof(int));
+    TEST(sizeof(enum medchoices) == sizeof(int));
+    TEST(sizeof(enum largechoices) == sizeof(int));
+    /* Basic two's complement checks. */
+    TEST(~(-1) == 0);
+    TEST(~(-1L) == 0L);
+
+    /* Check that values with sign bit 1 and value bits 0 are valid */
+    TEST(-(INT_MIN + 1) == INT_MAX);
+    TEST(-(LONG_MIN + 1) == LONG_MAX);
+
+    /* Check that unsigned-to-signed conversions preserve bit patterns */
+    TEST((int)((unsigned int)INT_MAX + 1) == INT_MIN);
+    TEST((long)((unsigned long)LONG_MAX + 1) == LONG_MIN);
+
+    return failures;
+}