diff -ur nginx-1.13.2/auto/lib/openssl/conf nginx-1.13.2-wolfssl/auto/lib/openssl/conf
--- nginx-1.13.2/auto/lib/openssl/conf	2017-06-28 00:44:19.000000000 +1000
+++ nginx-1.13.2-wolfssl/auto/lib/openssl/conf	2018-03-15 10:28:53.481314304 +1000
@@ -57,12 +57,38 @@
         ngx_feature="OpenSSL library"
         ngx_feature_name="NGX_OPENSSL"
         ngx_feature_run=no
-        ngx_feature_incs="#include <openssl/ssl.h>"
+        ngx_feature_incs="#include <options.h>
+                          #include <openssl/ssl.h>"
         ngx_feature_path=
         ngx_feature_libs="-lssl -lcrypto $NGX_LIBDL"
         ngx_feature_test="SSL_CTX_set_options(NULL, 0)"
+
+        if [ $WOLFSSL != NONE ]; then
+            ngx_feature="wolfSSL library in $WOLFSSL"
+            ngx_feature_path="$WOLFSSL/include/wolfssl"
+
+            if [ $NGX_RPATH = YES ]; then
+                ngx_feature_libs="-R$WOLFSSL/lib -L$WOLFSSL/lib -lwolfssl -lm $NGX_LIBDL"
+            else
+                ngx_feature_libs="-L$WOLFSSL/lib -lwolfssl -lm $NGX_LIBDL"
+            fi
+
+            CORE_INCS="$CORE_INCS $WOLFSSL/include/wolfssl"
+            CFLAGS="$CFLAGS -DWOLFSSL_NGINX"
+        fi
+
         . auto/feature
 
+        if [ $WOLFSSL != NONE -a $ngx_found = no ]; then
+cat << END
+
+$0: error: Could not find wolfSSL at $WOLFSSL/include/wolfssl.
+SSL modules require the wolfSSL library.
+
+END
+            exit 1
+        fi
+
         if [ $ngx_found = no ]; then
 
             # FreeBSD port
diff -ur nginx-1.13.2/auto/options nginx-1.13.2-wolfssl/auto/options
--- nginx-1.13.2/auto/options	2017-06-28 00:44:19.000000000 +1000
+++ nginx-1.13.2-wolfssl/auto/options	2017-06-29 10:18:05.421755825 +1000
@@ -143,6 +143,7 @@
 
 USE_OPENSSL=NO
 OPENSSL=NONE
+WOLFSSL=NONE
 
 USE_ZLIB=NO
 ZLIB=NONE
@@ -345,6 +346,7 @@
         --with-pcre-opt=*)               PCRE_OPT="$value"          ;;
         --with-pcre-jit)                 PCRE_JIT=YES               ;;
 
+        --with-wolfssl=*)                WOLFSSL="$value"           ;;
         --with-openssl=*)                OPENSSL="$value"           ;;
         --with-openssl-opt=*)            OPENSSL_OPT="$value"       ;;
 
@@ -563,6 +565,7 @@
   --with-libatomic                   force libatomic_ops library usage
   --with-libatomic=DIR               set path to libatomic_ops library sources
 
+  --with-wolfssl=DIR                 set path to wolfSSL headers and library
   --with-openssl=DIR                 set path to OpenSSL library sources
   --with-openssl-opt=OPTIONS         set additional build options for OpenSSL
 
diff -ur nginx-1.13.2/src/event/ngx_event_openssl.c nginx-1.13.2-wolfssl/src/event/ngx_event_openssl.c
--- nginx-1.13.2/src/event/ngx_event_openssl.c	2018-02-01 10:16:40.445367070 +1000
+++ nginx-1.13.2-wolfssl/src/event/ngx_event_openssl.c	2018-02-02 14:28:56.511074050 +1000
@@ -346,6 +346,10 @@
 
     SSL_CTX_set_info_callback(ssl->ctx, ngx_ssl_info_callback);
 
+#ifdef WOLFSSL_NGINX
+    SSL_CTX_set_verify(ssl->ctx, SSL_VERIFY_NONE, NULL);
+#endif
+
     return NGX_OK;
 }
 
@@ -654,6 +658,14 @@
 
 
 ngx_int_t
+ngx_ssl_set_verify_on(ngx_conf_t *cf, ngx_ssl_t *ssl)
+{
+    SSL_CTX_set_verify(ssl->ctx, SSL_VERIFY_PEER, ngx_ssl_verify_callback);
+
+    return NGX_OK;
+}
+
+ngx_int_t
 ngx_ssl_client_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *cert,
     ngx_int_t depth)
 {
@@ -1090,7 +1102,8 @@
      * maximum interoperability.
      */
 
-#if (defined SSL_CTX_set1_curves_list || defined SSL_CTRL_SET_CURVES_LIST)
+#if (defined SSL_CTX_set1_curves_list || defined SSL_CTRL_SET_CURVES_LIST) || \
+    defined(WOLFSSL_NGINX)
 
     /*
      * OpenSSL 1.0.2+ allows configuring a curve list instead of a single
@@ -3058,7 +3071,8 @@
             return -1;
         }
 
-#if OPENSSL_VERSION_NUMBER >= 0x10000000L
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L && \
+    (!defined(WOLFSSL_NGINX) || !defined(HAVE_FIPS))
         if (HMAC_Init_ex(hctx, key[0].hmac_key, size, digest, NULL) != 1) {
             ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "HMAC_Init_ex() failed");
             return -1;
@@ -3102,7 +3116,8 @@
             size = 32;
         }
 
-#if OPENSSL_VERSION_NUMBER >= 0x10000000L
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L && \
+    (!defined(WOLFSSL_NGINX) || !defined(HAVE_FIPS))
         if (HMAC_Init_ex(hctx, key[i].hmac_key, size, digest, NULL) != 1) {
             ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "HMAC_Init_ex() failed");
             return -1;
diff -ur nginx-1.13.2/src/event/ngx_event_openssl.h nginx-1.13.2-wolfssl/src/event/ngx_event_openssl.h
--- nginx-1.13.2/src/event/ngx_event_openssl.h	2017-06-28 00:44:20.000000000 +1000
+++ nginx-1.13.2-wolfssl/src/event/ngx_event_openssl.h	2018-02-01 09:02:00.048075409 +1000
@@ -12,6 +12,9 @@
 #include <ngx_config.h>
 #include <ngx_core.h>
 
+#ifdef WOLFSSL_NGINX
+#include <wolfssl/options.h>
+#endif
 #include <openssl/ssl.h>
 #include <openssl/err.h>
 #include <openssl/bn.h>
@@ -54,7 +57,7 @@
 #define ngx_ssl_conn_t          SSL
 
 
-#if (OPENSSL_VERSION_NUMBER < 0x10002000L)
+#if (OPENSSL_VERSION_NUMBER < 0x10002000L) && !defined(WOLFSSL_NGINX)
 #define SSL_is_server(s)        (s)->server
 #endif
 
@@ -153,6 +156,7 @@
     ngx_str_t *cert, ngx_str_t *key, ngx_array_t *passwords);
 ngx_int_t ngx_ssl_ciphers(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *ciphers,
     ngx_uint_t prefer_server_ciphers);
+ngx_int_t ngx_ssl_set_verify_on(ngx_conf_t *cf, ngx_ssl_t *ssl);
 ngx_int_t ngx_ssl_client_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
     ngx_str_t *cert, ngx_int_t depth);
 ngx_int_t ngx_ssl_trusted_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
diff -ur nginx-1.13.2/src/event/ngx_event_openssl_stapling.c nginx-1.13.2-wolfssl/src/event/ngx_event_openssl_stapling.c
--- nginx-1.13.2/src/event/ngx_event_openssl_stapling.c	2017-06-28 00:44:20.000000000 +1000
+++ nginx-1.13.2-wolfssl/src/event/ngx_event_openssl_stapling.c	2017-06-29 10:18:05.421755825 +1000
@@ -313,7 +313,9 @@
     for (i = 0; i < n; i++) {
         issuer = sk_X509_value(chain, i);
         if (X509_check_issued(issuer, cert) == X509_V_OK) {
-#if OPENSSL_VERSION_NUMBER >= 0x10100001L
+#ifdef WOLFSSL_NGINX
+            issuer = X509_dup(issuer);
+#elif OPENSSL_VERSION_NUMBER >= 0x10100001L
             X509_up_ref(issuer);
 #else
             CRYPTO_add(&issuer->references, 1, CRYPTO_LOCK_X509);
diff -ur nginx-1.13.2/src/http/modules/ngx_http_proxy_module.c nginx-1.13.2-wolfssl/src/http/modules/ngx_http_proxy_module.c
--- nginx-1.13.2/src/http/modules/ngx_http_proxy_module.c	2017-06-28 00:44:20.000000000 +1000
+++ nginx-1.13.2-wolfssl/src/http/modules/ngx_http_proxy_module.c	2017-06-29 10:18:05.421755825 +1000
@@ -4373,6 +4373,8 @@
             return NGX_ERROR;
         }
 
+        ngx_ssl_set_verify_on(cf, plcf->upstream.ssl);
+
         if (ngx_ssl_trusted_certificate(cf, plcf->upstream.ssl,
                                         &plcf->ssl_trusted_certificate,
                                         plcf->ssl_verify_depth)
diff -ur nginx-1.13.2/src/http/modules/ngx_http_ssl_module.c nginx-1.13.2-wolfssl/src/http/modules/ngx_http_ssl_module.c
--- nginx-1.13.2/src/http/modules/ngx_http_ssl_module.c	2017-06-28 00:44:20.000000000 +1000
+++ nginx-1.13.2-wolfssl/src/http/modules/ngx_http_ssl_module.c	2017-06-29 10:18:05.421755825 +1000
@@ -14,7 +14,11 @@
     ngx_pool_t *pool, ngx_str_t *s);
 
 
+#ifndef WOLFSSL_NGINX
 #define NGX_DEFAULT_CIPHERS     "HIGH:!aNULL:!MD5"
+#else
+#define NGX_DEFAULT_CIPHERS     "ALL"
+#endif
 #define NGX_DEFAULT_ECDH_CURVE  "auto"
 
 #define NGX_HTTP_NPN_ADVERTISE  "\x08http/1.1"
diff -ur nginx-1.13.2/src/mail/ngx_mail_ssl_module.c nginx-1.13.2-wolfssl/src/mail/ngx_mail_ssl_module.c
--- nginx-1.13.2/src/mail/ngx_mail_ssl_module.c	2017-06-28 00:44:21.000000000 +1000
+++ nginx-1.13.2-wolfssl/src/mail/ngx_mail_ssl_module.c	2017-06-29 10:18:05.421755825 +1000
@@ -10,7 +10,11 @@
 #include <ngx_mail.h>
 
 
+#ifndef WOLFSSL_NGINX
 #define NGX_DEFAULT_CIPHERS     "HIGH:!aNULL:!MD5"
+#else
+#define NGX_DEFAULT_CIPHERS     "ALL"
+#endif
 #define NGX_DEFAULT_ECDH_CURVE  "auto"
 
 
diff -ur nginx-1.13.2/src/stream/ngx_stream_proxy_module.c nginx-1.13.2-wolfssl/src/stream/ngx_stream_proxy_module.c
--- nginx-1.13.2/src/stream/ngx_stream_proxy_module.c	2017-06-28 00:44:22.000000000 +1000
+++ nginx-1.13.2-wolfssl/src/stream/ngx_stream_proxy_module.c	2017-06-29 10:18:05.421755825 +1000
@@ -1989,6 +1989,8 @@
             return NGX_ERROR;
         }
 
+        ngx_ssl_set_verify_on(cf, pscf->ssl);
+
         if (ngx_ssl_trusted_certificate(cf, pscf->ssl,
                                         &pscf->ssl_trusted_certificate,
                                         pscf->ssl_verify_depth)
diff -ur nginx-1.13.2/src/stream/ngx_stream_ssl_module.c nginx-1.13.2-wolfssl/src/stream/ngx_stream_ssl_module.c
--- nginx-1.13.2/src/stream/ngx_stream_ssl_module.c	2017-06-28 00:44:22.000000000 +1000
+++ nginx-1.13.2-wolfssl/src/stream/ngx_stream_ssl_module.c	2017-06-29 10:18:05.421755825 +1000
@@ -14,7 +14,11 @@
     ngx_pool_t *pool, ngx_str_t *s);
 
 
+#ifndef WOLFSSL_NGINX
 #define NGX_DEFAULT_CIPHERS     "HIGH:!aNULL:!MD5"
+#else
+#define NGX_DEFAULT_CIPHERS     "ALL"
+#endif
 #define NGX_DEFAULT_ECDH_CURVE  "auto"