--- /dev/null
+From: Gert Doering <gert@greenie.muc.de>
+
+Support for wolfSSL in OpenVPN
+
+This patch adds support for wolfSSL in OpenVPN. Support is added by using
+wolfSSL's OpenSSL compatibility layer. Function calls are left unchanged
+and instead the OpenSSL includes point to wolfSSL headers and OpenVPN is
+linked against the wolfSSL library. The wolfSSL installation directory is
+detected using pkg-config.
+
+As requested by OpenVPN maintainers, this patch does not include
+wolfssl/options.h on its own. By defining the macro EXTERNAL_OPTS_OPENVPN
+in the configure script wolfSSL will include wolfssl/options.h on its own
+(change added in wolfSSL/wolfssl#2825). The patch
+adds an option '--disable-wolfssl-options-h' in case the user would like
+to supply their own settings file for wolfSSL.
+
+wolfSSL:
+Support added in: wolfSSL/wolfssl#2503
+
+git clone https://github.com/wolfSSL/wolfssl.git
+cd wolfssl
+./autogen.sh
+./configure --enable-openvpn
+make
+sudo make install
+
+OpenVPN:
+
+autoreconf -i -v -f
+./configure --with-crypto-library=wolfssl
+make
+make check
+sudo make install
+
+Signed-off-by: Juliusz Sosinowicz <juliusz@wolfssl.com>
+Acked-by: Arne Schwabe <arne@rfc2549.org>
+Message-Id: <20210317181153.83716-1-juliusz@wolfssl.com>
+URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg21686.html
+Signed-off-by: Gert Doering <gert@greenie.muc.de>
+---
+ configure.ac | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
+ src/openvpn/syshead.h | 3 ++-
+ 2 files changed, 110 insertions(+), 3 deletions(-)
+--- a/configure.ac
++++ b/configure.ac
+@@ -271,16 +271,23 @@ AC_ARG_WITH(
+
+ AC_ARG_WITH(
+ [crypto-library],
+- [AS_HELP_STRING([--with-crypto-library=library], [build with the given crypto library, TYPE=openssl|mbedtls @<:@default=openssl@:>@])],
++ [AS_HELP_STRING([--with-crypto-library=library], [build with the given crypto library, TYPE=openssl|mbedtls|wolfssl @<:@default=openssl@:>@])],
+ [
+ case "${withval}" in
+- openssl|mbedtls) ;;
++ openssl|mbedtls|wolfssl) ;;
+ *) AC_MSG_ERROR([bad value ${withval} for --with-crypto-library]) ;;
+ esac
+ ],
+ [with_crypto_library="openssl"]
+ )
+
++AC_ARG_ENABLE(
++ [wolfssl-options-h],
++ [AS_HELP_STRING([--disable-wolfssl-options-h], [Disable including options.h in wolfSSL @<:@default=yes@:>@])],
++ ,
++ [enable_wolfssl_options_h="yes"]
++)
++
+ AC_ARG_VAR([PLUGINDIR], [Path of plug-in directory @<:@default=LIBDIR/openvpn/plugins@:>@])
+ if test -n "${PLUGINDIR}"; then
+ plugindir="${PLUGINDIR}"
+@@ -1026,6 +1033,105 @@ elif test "${with_crypto_library}" = "mb
+ AC_DEFINE([ENABLE_CRYPTO_MBEDTLS], [1], [Use mbed TLS library])
+ CRYPTO_CFLAGS="${MBEDTLS_CFLAGS}"
+ CRYPTO_LIBS="${MBEDTLS_LIBS}"
++
++elif test "${with_crypto_library}" = "wolfssl"; then
++ AC_ARG_VAR([WOLFSSL_CFLAGS], [C compiler flags for wolfssl. The include directory should
++ contain the regular wolfSSL header files but also the
++ wolfSSL OpenSSL header files. Ex: -I/usr/local/include
++ -I/usr/local/include/wolfssl])
++ AC_ARG_VAR([WOLFSSL_LIBS], [linker flags for wolfssl])
++
++ saved_CFLAGS="${CFLAGS}"
++ saved_LIBS="${LIBS}"
++
++ if test -z "${WOLFSSL_CFLAGS}" -a -z "${WOLFSSL_LIBS}"; then
++ # if the user did not explicitly specify flags, try to autodetect
++ PKG_CHECK_MODULES(
++ [WOLFSSL],
++ [wolfssl],
++ [],
++ [AC_MSG_ERROR([Could not find wolfSSL.])]
++ )
++ PKG_CHECK_VAR(
++ [WOLFSSL_INCLUDEDIR],
++ [wolfssl],
++ [includedir],
++ [],
++ [AC_MSG_ERROR([Could not find wolfSSL includedir variable.])]
++ )
++ WOLFSSL_CFLAGS="${WOLFSSL_CFLAGS} -I${WOLFSSL_INCLUDEDIR}/wolfssl"
++ fi
++ saved_CFLAGS="${CFLAGS}"
++ saved_LIBS="${LIBS}"
++ CFLAGS="${CFLAGS} ${WOLFSSL_CFLAGS}"
++ LIBS="${LIBS} ${WOLFSSL_LIBS}"
++
++ AC_CHECK_LIB(
++ [wolfssl],
++ [wolfSSL_Init],
++ [],
++ [AC_MSG_ERROR([Could not link wolfSSL library.])]
++ )
++ AC_CHECK_HEADER([wolfssl/options.h],,[AC_MSG_ERROR([wolfSSL header wolfssl/options.h not found!])])
++
++ # wolfSSL signal EKM support
++ have_export_keying_material="yes"
++
++ AC_DEFINE([HAVE_HMAC_CTX_NEW], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_HMAC_CTX_FREE], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_HMAC_CTX_RESET], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EVP_MD_CTX_NEW], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EVP_MD_CTX_FREE], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EVP_MD_CTX_RESET], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EVP_CIPHER_CTX_RESET], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_OPENSSL_VERSION], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_SSL_CTX_GET_DEFAULT_PASSWD_CB], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_SSL_CTX_GET_DEFAULT_PASSWD_CB_USERDATA], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_SSL_CTX_SET_SECURITY_LEVEL], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_X509_GET0_NOTBEFORE], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_X509_GET0_NOTAFTER], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_X509_GET0_PUBKEY], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_X509_STORE_GET0_OBJECTS], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_X509_OBJECT_FREE], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_X509_OBJECT_GET_TYPE], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EVP_PKEY_ID], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EVP_PKEY_GET0_RSA], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EVP_PKEY_GET0_DSA], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EVP_PKEY_GET0_EC_KEY], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_SET_FLAGS], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_BITS], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_GET0_KEY], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_SET0_KEY], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_DSA_GET0_PQG], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_DSA_BITS], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_NEW], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_FREE], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_SET_PUB_ENC], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_SET_PUB_DEC], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_SET_PRIV_ENC], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_SET_PRIV_DEC], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_SET_INIT], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_SET_SIGN], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_SET_FINISH], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_SET0_APP_DATA], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_RSA_METH_GET0_APP_DATA], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++ AC_DEFINE([HAVE_EC_GROUP_ORDER_BITS], [1], [Emulate AC_CHECK_FUNCS since these are defined as macros])
++
++ if test "${enable_wolfssl_options_h}" = "yes"; then
++ AC_DEFINE([EXTERNAL_OPTS_OPENVPN], [1], [Include options.h from wolfSSL library])
++ else
++ AC_DEFINE([WOLFSSL_USER_SETTINGS], [1], [Use custom user_settings.h file for wolfSSL library])
++ fi
++
++ have_export_keying_material="yes"
++
++ CFLAGS="${saved_CFLAGS}"
++ LIBS="${saved_LIBS}"
++
++ AC_DEFINE([ENABLE_CRYPTO_WOLFSSL], [1], [Use wolfSSL crypto library])
++ AC_DEFINE([ENABLE_CRYPTO_OPENSSL], [1], [Use wolfSSL openssl compatibility layer])
++ CRYPTO_CFLAGS="${WOLFSSL_CFLAGS}"
++ CRYPTO_LIBS="${WOLFSSL_LIBS}"
+ else
+ AC_MSG_ERROR([Invalid crypto library: ${with_crypto_library}])
+ fi
+--- a/src/openvpn/syshead.h
++++ b/src/openvpn/syshead.h
+@@ -582,7 +582,8 @@ socket_defined(const socket_descriptor_t
+ /*
+ * Do we have CryptoAPI capability?
+ */
+-#if defined(_WIN32) && defined(ENABLE_CRYPTO_OPENSSL)
++#if defined(_WIN32) && defined(ENABLE_CRYPTO_OPENSSL) && \
++ !defined(ENABLE_CRYPTO_WOLFSSL)
+ #define ENABLE_CRYPTOAPI
+ #endif
+
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