# - Try to find the OpenSSL encryption library

# Once done this will define

#

#  OPENSSL_ROOT_DIR - Set this variable to the root installation of OpenSSL

#

# Read-Only variables:

#  OPENSSL_FOUND - system has the OpenSSL library

#  OPENSSL_INCLUDE_DIR - the OpenSSL include directory

#  OPENSSL_LIBRARIES - The libraries needed to use OpenSSL

#  OPENSSL_VERSION - This is set to $major.$minor.$revision$path (eg. 0.9.8s)

#=============================================================================

# Copyright 2006-2009 Kitware, Inc.

# Copyright 2006 Alexander Neundorf <neundorf@kde.org>

# Copyright 2009-2011 Mathieu Malaterre <mathieu.malaterre@gmail.com>

#

# Distributed under the OSI-approved BSD License (the "License");

# see accompanying file Copyright.txt for details.

#

# This software is distributed WITHOUT ANY WARRANTY; without even the

# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# See the License for more information.

#=============================================================================

# (To distribute this file outside of CMake, substitute the full

#  License text for the above reference.)

if (UNIX AND NOT ANDROID)

  find_package(PkgConfig QUIET)

  pkg_check_modules(_OPENSSL QUIET openssl)

endif (UNIX AND NOT ANDROID)

# http://www.slproweb.com/products/Win32OpenSSL.html

SET(_OPENSSL_ROOT_HINTS

  $ENV{OPENSSL_ROOT_DIR}

  ${OPENSSL_ROOT_DIR}

  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\OpenSSL (32-bit)_is1;Inno Setup: App Path]"

  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\OpenSSL (64-bit)_is1;Inno Setup: App Path]"

  )

SET(_OPENSSL_ROOT_PATHS

  "$ENV{PROGRAMFILES}/OpenSSL"

  "$ENV{PROGRAMFILES}/OpenSSL-Win32"

  "$ENV{PROGRAMFILES}/OpenSSL-Win64"

  "C:/OpenSSL/"

  "C:/OpenSSL-Win32/"

  "C:/OpenSSL-Win64/"

  "/obj/local/armeabi/"

  "/obj/local/armeabi-v7a/"

  )

SET(_OPENSSL_ROOT_HINTS_AND_PATHS

  HINTS ${_OPENSSL_ROOT_HINTS}

  PATHS ${_OPENSSL_ROOT_PATHS}

  )

FIND_PATH(OPENSSL_INCLUDE_DIR

  NAMES

    openssl/ssl.h

  PATH_SUFFIXES

	"include"

  HINTS

    ${_OPENSSL_INCLUDEDIR}

  ${_OPENSSL_ROOT_HINTS_AND_PATHS}

  PATH_SUFFIXES

    include

)

IF(MSVC)

  if(${MSVC_RUNTIME} STREQUAL "static")

    set(MSVC_RUNTIME_SUFFIX "MT")

  else()

    set(MSVC_RUNTIME_SUFFIX "MD")

  endif()

ENDIF(MSVC)

IF(ANDROID)

    FIND_LIBRARY(SSL_LIBRARY

      NAMES

        "ssl"

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        "lib"

    )

    FIND_LIBRARY(CRYPTO_LIBRARY

      NAMES

        "crypto"

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        "lib"

    )

    list(APPEND OPENSSL_LIBRARIES ${CRYPTO_LIBRARY} ${SSL_LIBRARY})

ELSEIF(WIN32 AND NOT CYGWIN)

  # MINGW should go here too

  IF(MSVC)

    # /MD and /MDd are the standard values - if someone wants to use

    # others, the libnames have to change here too

    # use also ssl and ssleay32 in debug as fallback for openssl < 0.9.8b

    # TODO: handle /MT and static lib

    # In Visual C++ naming convention each of these four kinds of Windows libraries has it's standard suffix:

    #   * MD for dynamic-release

    #   * MDd for dynamic-debug

    #   * MT for static-release

    #   * MTd for static-debug

    # Implementation details:

    # We are using the libraries located in the VC subdir instead of the parent directory even though :

    # libeay32MD.lib is identical to ../libeay32.lib, and

    # ssleay32MD.lib is identical to ../ssleay32.lib

    if(DEFINED OPENSSL_STATIC)

      set(MSVC_RUNTIME_PATH_SUFFIX "lib/VC/static")

    else()

      set(MSVC_RUNTIME_PATH_SUFFIX "")

    endif()

    FIND_LIBRARY(LIB_EAY_DEBUG

      NAMES

        "libeay32${MSVC_RUNTIME_SUFFIX}d"

        libeay32

        libcrypto

        libcrypto-1_1

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        ${MSVC_RUNTIME_PATH_SUFFIX}

        "lib"

        "VC"

        "lib/VC"

    )

    FIND_LIBRARY(LIB_EAY_RELEASE

      NAMES

        "libeay32${MSVC_RUNTIME_SUFFIX}"

        libeay32

        libcrypto

        libcrypto-1_1

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        ${MSVC_RUNTIME_PATH_SUFFIX}

        "lib"

        "VC"

        "lib/VC"

    )

    FIND_LIBRARY(SSL_EAY_DEBUG

      NAMES

        "ssleay32${MSVC_RUNTIME_SUFFIX}d"

        ssleay32

        ssl

        libssl

        libssl-1_1

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        ${MSVC_RUNTIME_PATH_SUFFIX}

        "lib"

        "VC"

        "lib/VC"

    )

    FIND_LIBRARY(SSL_EAY_RELEASE

      NAMES

        "ssleay32${MSVC_RUNTIME_SUFFIX}"

        ssleay32

        ssl

        libssl

        libssl-1_1

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        ${MSVC_RUNTIME_PATH_SUFFIX}

        "lib"

        "VC"

        "lib/VC"

    )

    set( OPENSSL_DEBUG_LIBRARIES ${SSL_EAY_DEBUG} ${LIB_EAY_DEBUG} )

	set( OPENSSL_RELEASE_LIBRARIES ${SSL_EAY_RELEASE} ${LIB_EAY_RELEASE} )

	set( OPENSSL_LIBRARIES ${OPENSSL_RELEASE_LIBRARIES} )

    MARK_AS_ADVANCED(SSL_EAY_DEBUG SSL_EAY_RELEASE)

    MARK_AS_ADVANCED(LIB_EAY_DEBUG LIB_EAY_RELEASE)

  ELSEIF(MINGW)

    # same player, for MingW

    FIND_LIBRARY(LIB_EAY

      NAMES

        libeay32

        libcrypto

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        "lib"

        "lib/MinGW"

    )

    FIND_LIBRARY(SSL_EAY

      NAMES

        ssleay32

        libssl

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        "lib"

        "lib/MinGW"

    )

    MARK_AS_ADVANCED(SSL_EAY LIB_EAY)

    set( OPENSSL_LIBRARIES ${SSL_EAY} ${LIB_EAY} )

  ELSE(MSVC)

    # Not sure what to pick for -say- intel, let's use the toplevel ones and hope someone report issues:

    FIND_LIBRARY(LIB_EAY

      NAMES

        libeay32

        libcrypto

        libcrypto-1_1

      HINTS

        ${_OPENSSL_LIBDIR}

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        lib

    )

    FIND_LIBRARY(SSL_EAY

      NAMES

        ssleay32

        libssl

        libssl-1_1

      HINTS

        ${_OPENSSL_LIBDIR}

      ${_OPENSSL_ROOT_HINTS_AND_PATHS}

      PATH_SUFFIXES

        lib

    )

    MARK_AS_ADVANCED(SSL_EAY LIB_EAY)

    set( OPENSSL_LIBRARIES ${SSL_EAY} ${LIB_EAY} )

  ENDIF(MSVC)

ELSE(WIN32 AND NOT CYGWIN)

  FIND_LIBRARY(OPENSSL_SSL_LIBRARY

    NAMES

      ssl

      ssleay32

      libssl-1_1

      "ssleay32${MSVC_RUNTIME_SUFFIX}"

    HINTS

      ${_OPENSSL_LIBDIR}

    ${_OPENSSL_ROOT_HINTS_AND_PATHS}

    PATH_SUFFIXES

      lib

  )

  FIND_LIBRARY(OPENSSL_CRYPTO_LIBRARY

    NAMES

      crypto

      libcrypto-1_1

    HINTS

      ${_OPENSSL_LIBDIR}

    ${_OPENSSL_ROOT_HINTS_AND_PATHS}

    PATH_SUFFIXES

      lib

  )

  MARK_AS_ADVANCED(OPENSSL_CRYPTO_LIBRARY OPENSSL_SSL_LIBRARY)

  # compat defines

  SET(OPENSSL_SSL_LIBRARIES ${OPENSSL_SSL_LIBRARY})

  SET(OPENSSL_CRYPTO_LIBRARIES ${OPENSSL_CRYPTO_LIBRARY})

  SET(OPENSSL_LIBRARIES ${OPENSSL_SSL_LIBRARY} ${OPENSSL_CRYPTO_LIBRARY})

ENDIF(ANDROID)

function(from_hex HEX DEC)

  string(TOUPPER "${HEX}" HEX)

  set(_res 0)

  string(LENGTH "${HEX}" _strlen)

  while (_strlen GREATER 0)

    math(EXPR _res "${_res} * 16")

    string(SUBSTRING "${HEX}" 0 1 NIBBLE)

    string(SUBSTRING "${HEX}" 1 -1 HEX)

    if (NIBBLE STREQUAL "A")

      math(EXPR _res "${_res} + 10")

    elseif (NIBBLE STREQUAL "B")

      math(EXPR _res "${_res} + 11")

    elseif (NIBBLE STREQUAL "C")

      math(EXPR _res "${_res} + 12")

    elseif (NIBBLE STREQUAL "D")

      math(EXPR _res "${_res} + 13")

    elseif (NIBBLE STREQUAL "E")

      math(EXPR _res "${_res} + 14")

    elseif (NIBBLE STREQUAL "F")

      math(EXPR _res "${_res} + 15")

    else()

      math(EXPR _res "${_res} + ${NIBBLE}")

    endif()

    string(LENGTH "${HEX}" _strlen)

  endwhile()

  set(${DEC} ${_res} PARENT_SCOPE)

endfunction(from_hex)

if (OPENSSL_INCLUDE_DIR)

  if (_OPENSSL_VERSION)

    set(OPENSSL_VERSION "${_OPENSSL_VERSION}")

  elseif(OPENSSL_INCLUDE_DIR AND EXISTS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h")

    file(STRINGS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h" openssl_version_str

         REGEX "^#.?define[\t ]+OPENSSL_VERSION_NUMBER[\t ]+0x([0-9a-fA-F])+.*")

    # The version number is encoded as 0xMNNFFPPS: major minor fix patch status

    # The status gives if this is a developer or prerelease and is ignored here.

    # Major, minor, and fix directly translate into the version numbers shown in

    # the string. The patch field translates to the single character suffix that

    # indicates the bug fix state, which 00 -> nothing, 01 -> a, 02 -> b and so

    # on.

    string(REGEX REPLACE "^.*OPENSSL_VERSION_NUMBER[\t ]+0x([0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F]).*$"

           "\\1;\\2;\\3;\\4;\\5" OPENSSL_VERSION_LIST "${openssl_version_str}")

    list(GET OPENSSL_VERSION_LIST 0 OPENSSL_VERSION_MAJOR)

    list(GET OPENSSL_VERSION_LIST 1 OPENSSL_VERSION_MINOR)

    from_hex("${OPENSSL_VERSION_MINOR}" OPENSSL_VERSION_MINOR)

    list(GET OPENSSL_VERSION_LIST 2 OPENSSL_VERSION_FIX)

    from_hex("${OPENSSL_VERSION_FIX}" OPENSSL_VERSION_FIX)

    list(GET OPENSSL_VERSION_LIST 3 OPENSSL_VERSION_PATCH)

    if (NOT OPENSSL_VERSION_PATCH STREQUAL "00")

      from_hex("${OPENSSL_VERSION_PATCH}" _tmp)

      # 96 is the ASCII code of 'a' minus 1

      math(EXPR OPENSSL_VERSION_PATCH_ASCII "${_tmp} + 96")

      unset(_tmp)

      # Once anyone knows how OpenSSL would call the patch versions beyond 'z'

      # this should be updated to handle that, too. This has not happened yet

      # so it is simply ignored here for now.

      string(ASCII "${OPENSSL_VERSION_PATCH_ASCII}" OPENSSL_VERSION_PATCH_STRING)

    endif (NOT OPENSSL_VERSION_PATCH STREQUAL "00")

    set(OPENSSL_VERSION "${OPENSSL_VERSION_MAJOR}.${OPENSSL_VERSION_MINOR}.${OPENSSL_VERSION_FIX}${OPENSSL_VERSION_PATCH_STRING}")

  endif (_OPENSSL_VERSION)

endif (OPENSSL_INCLUDE_DIR)

include(FindPackageHandleStandardArgs)

if (OPENSSL_VERSION)

  find_package_handle_standard_args(OpenSSL

    REQUIRED_VARS

      OPENSSL_LIBRARIES

      OPENSSL_INCLUDE_DIR

    VERSION_VAR

      OPENSSL_VERSION

    FAIL_MESSAGE

      "Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR"

  )

else (OPENSSL_VERSION)

  find_package_handle_standard_args(OpenSSL "Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR"

    OPENSSL_LIBRARIES

    OPENSSL_INCLUDE_DIR

  )

endif (OPENSSL_VERSION)

MARK_AS_ADVANCED(OPENSSL_INCLUDE_DIR OPENSSL_LIBRARIES OPENSSL_DEBUG_LIBRARIES OPENSSL_RELEASE_LIBRARIES)