diff --git a/third-party/ios/setenv-ios.sh b/third-party/ios/setenv-ios.sh
new file mode 100755
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+++ b/third-party/ios/setenv-ios.sh
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+#!/usr/bin/env bash
+
+# Use as 'source setenv-ios.sh device|simulator'.
+
+# ====================================================================
+# Sets the cross compile environment for Xcode/iOS
+# Based upon OpenSSL's setenv-ios.sh  (by TH, JW, and SM).
+#
+# Crypto++ Library is copyrighted as a compilation and (as of version 5.6.2)
+# licensed under the Boost Software License 1.0, while the individual files
+# in the compilation are all public domain.
+#
+# See http://www.cryptopp.com/wiki/iOS_(Command_Line) for more details
+# ====================================================================
+
+#########################################
+#####       Clear old options       #####
+#########################################
+
+unset IS_CROSS_COMPILE
+
+unset IS_IOS
+unset IS_ANDROID
+unset IS_ARM_EMBEDDED
+
+unset IOS_ARCH
+unset IOS_FLAGS
+unset IOS_SYSROOT
+
+#########################################
+#####   User configurable options   #####
+#########################################
+
+# Define SETENV_VERBOSE=1 to print the configuration, including exported variables.
+SETENV_VERBOSE=1
+
+# For various SDKs, see https://groups.google.com/d/msg/cryptopp-users/8Z0qfwAjSbA/nKYbhTNBBgAJ
+
+########################################
+#####         Command line         #####
+########################################
+
+for ARG in "$@"
+do
+  CL=$(echo $ARG | tr '[A-Z]' '[a-z]')
+
+  # i386 (simulator)
+  if [ "$CL" == "i386" ]; then
+    IOS_ARCH=i386
+  fi
+
+  # x86_64 (simulator)
+  if [ "$CL" == "x86_64" ]; then
+    IOS_ARCH=x86_64
+  fi
+
+  # ARMv5
+  if [ "$CL" == "armv5" ]; then
+    IOS_ARCH=armv5
+  fi
+
+  # ARMv6
+  if [ "$CL" == "armv6" ]; then
+    IOS_ARCH=armv6
+  fi
+
+  # ARMv7
+  if [ "$CL" == "armv7" ]; then
+    IOS_ARCH=armv7
+  fi
+
+  # ARMv7s
+  if [ "$CL" == "armv7s" ]; then
+    IOS_ARCH=armv7s
+  fi
+
+  # ARM64
+  if [ "$CL" == "arm64" ]; then
+    IOS_ARCH=arm64
+  fi
+
+  # iPhone
+  if [ "$CL" == "iphone" ] || [ "$CL" == "iphoneos" ]; then
+    APPLE_SDK=iPhoneOS
+  fi
+
+  # iPhone Simulator
+  if [ "$CL" == "simulator" ] || [ "$CL" == "iphonesimulator" ]; then
+    APPLE_SDK=iPhoneSimulator
+  fi
+
+  # Watch
+  if [ "$CL" == "watch" ] || [ "$CL" == "watchos" ] || [ "$CL" == "applewatch" ]; then
+    APPLE_SDK=WatchOS
+  fi
+
+  # Watch Simulator
+  if [ "$CL" == "watchsimulator" ]; then
+    APPLE_SDK=WatchSimulator
+  fi
+
+  # Apple TV
+  if [ "$CL" == "tv" ] || [ "$CL" == "appletv" ] || [ "$CL" == "appletvos" ]; then
+    APPLE_SDK=AppleTVOS
+  fi
+
+  # Apple TV Simulator
+  if [ "$CL" == "tvsimulator" ] || [ "$CL" == "appletvsimulator" ]; then
+    APPLE_SDK=AppleTVSimulator
+  fi
+
+done
+
+# Defaults if not set
+if [ -z "$APPLE_SDK" ]; then
+	APPLE_SDK=iPhoneOS
+fi
+
+if [ -z "$IOS_ARCH" ]; then
+	if [ "$APPLE_SDK" == "iPhoneOS" ]; then
+		IOS_ARCH=armv7
+	elif [ "$APPLE_SDK" == "iPhoneSimulator" ]; then
+		IOS_ARCH=i386
+	elif [ "$APPLE_SDK" == "AppleTVOS" ]; then
+		IOS_ARCH=arm64
+	elif [ "$APPLE_SDK" == "WatchOS" ]; then
+		IOS_ARCH=armv7
+	fi
+
+	# TODO: fill in missing simulator architectures
+fi
+
+# Allow a user override? I think we should be doing this. The use case is:
+# move /Applications/Xcode somewhere else for a side-by-side installation.
+# These sorts of tricks are a required procedure on Apple's gear:
+# http://stackoverflow.com/questions/11651773/install-simulator-sdk-4-3-to-xcode-4-4-on-mountain-lion
+if [ -z "$XCODE_DEVELOPER" ]; then
+  XCODE_DEVELOPER=$(xcode-select -print-path 2>/dev/null)
+fi
+
+if [ ! -d "$XCODE_DEVELOPER" ]; then
+  echo "ERROR: unable to find XCODE_DEVELOPER directory."
+  [ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
+fi
+
+# Default toolchain location
+XCODE_TOOLCHAIN="$XCODE_DEVELOPER/usr/bin"
+
+if [ ! -d "$XCODE_TOOLCHAIN" ]; then
+  echo "ERROR: unable to find XCODE_TOOLCHAIN directory."
+  [ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
+fi
+
+# XCODE_DEVELOPER_TOP is the top of the development tools tree
+XCODE_DEVELOPER_TOP="$XCODE_DEVELOPER/Platforms/$APPLE_SDK.platform/Developer"
+
+if [ ! -d "$XCODE_DEVELOPER_TOP" ]; then
+  echo "ERROR: unable to find XCODE_DEVELOPER_TOP directory."
+  [ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
+fi
+
+# IOS_TOOLCHAIN is the location of the actual compiler tools.
+if [ -d "$XCODE_DEVELOPER/Toolchains/XcodeDefault.xctoolchain/usr/bin/" ]; then
+  IOS_TOOLCHAIN="$XCODE_DEVELOPER/Toolchains/XcodeDefault.xctoolchain/usr/bin/"
+elif [ -d "$XCODE_DEVELOPER_TOP/usr/bin/" ]; then
+  IOS_TOOLCHAIN="$XCODE_DEVELOPER_TOP/usr/bin/"
+fi
+
+if [ -z "$IOS_TOOLCHAIN" ] || [ ! -d "$IOS_TOOLCHAIN" ]; then
+  echo "ERROR: unable to find Xcode cross-compiler tools."
+  [ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
+fi
+
+#
+# XCODE_SDK is the SDK name/version being used - adjust the list as appropriate.
+# For example, remove 4.3, 6.2, and 6.1 if they are not installed. We go back to
+# the 1.0 SDKs because Apple WatchOS uses low numbers, like 2.0 and 2.1.
+unset XCODE_SDK
+for i in $(seq -f "%.1f" 20.0 -0.1 1.0)
+do
+	if [ -d "$XCODE_DEVELOPER/Platforms/$APPLE_SDK.platform/Developer/SDKs/$APPLE_SDK$i.sdk" ]; then
+    	XCODE_SDK="$APPLE_SDK$i.sdk"
+      	break
+	fi
+done
+
+# Error checking
+if [ -z "$XCODE_SDK" ]; then
+    echo "ERROR: unable to find a SDK."
+    [ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
+fi
+
+# Simulator fixup. LD fails to link dylib.
+if [ "$APPLE_SDK" == "iPhoneSimulator" ] && [ "$IOS_ARCH" == "i386" ]; then
+  IOS_FLAGS=-miphoneos-version-min=5
+fi
+
+# ARMv7s fixup. Xcode 4/iOS 6
+if [ "$IOS_ARCH" == "armv7s" ]; then
+  IOS_FLAGS=-miphoneos-version-min=6
+fi
+
+# ARM64 fixup. Xcode 5/iOS 7
+if [ "$IOS_ARCH" == "arm64" ]; then
+  IOS_FLAGS=-miphoneos-version-min=7
+fi
+
+# ARM64 Simulator fixup. Under Xcode 6/iOS 8, it uses x86_64 and not i386
+if [ "$IOS_ARCH" == "x86_64" ]; then
+  IOS_FLAGS=-miphoneos-version-min=8
+fi
+
+# Simulator uses i386 or x86_64, Device uses ARMv5, ARMv6, ARMv7, or ARMv7s
+#
+# Apple deprecated ARMv5 at iOS 4.0, and ARMv6 at iOS 5.0
+# http://stackoverflow.com/questions/7488657/how-to-build-for-armv6-and-armv7-architectures-with-ios-5
+
+echo "Configuring for $APPLE_SDK ($IOS_ARCH)"
+
+# Used by the GNUmakefile-cross
+export IS_IOS=1
+export IOS_ARCH
+export IOS_FLAGS
+export IOS_SYSROOT="$XCODE_DEVELOPER_TOP/SDKs/$XCODE_SDK"
+
+#######################################
+#####          Verbose           #####
+#######################################
+
+if [ "$SETENV_VERBOSE" == "1" ]; then
+
+  echo "XCODE_SDK:" $XCODE_SDK
+  echo "XCODE_DEVELOPER: $XCODE_DEVELOPER"
+  echo "XCODE_TOOLCHAIN: $XCODE_TOOLCHAIN"
+  echo "XCODE_DEVELOPER_TOP: $XCODE_DEVELOPER_TOP"
+  echo "IOS_ARCH: $IOS_ARCH"
+  echo "IOS_TOOLCHAIN: $IOS_TOOLCHAIN"
+  echo "IOS_FLAGS: $IOS_FLAGS"
+  echo "IOS_SYSROOT: $IOS_SYSROOT"
+fi
+
+########################################
+#####     Path with Toolchains     #####
+########################################
+
+# Only modify/export PATH if IOS_TOOLCHAIN good
+if [ ! -z "$IOS_TOOLCHAIN" ] && [ ! -z "$XCODE_TOOLCHAIN" ]; then
+
+	# And only modify PATH if IOS_TOOLCHAIN is not present
+	TOOL_PATH="$IOS_TOOLCHAIN:$XCODE_TOOLCHAIN"
+	LEN=${#TOOL_PATH}
+	SUBSTR=${PATH:0:$LEN}
+	if [ "$SUBSTR" != "$TOOL_PATH" ]; then
+		export PATH="$TOOL_PATH":"$PATH"
+	fi
+else
+	echo "ERROR: unable to set new PATH."
+	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
+fi
+
+########################################
+#####        Tool Test Time        #####
+########################################
+
+# Test for various tools needed during cross compilation.
+# FOUND_ALL starts high, and pushes low on failure
+FOUND_ALL=1
+
+# Apple's embedded g++ cannot compile integer.cpp
+TOOLS=(clang clang++ ar ranlib libtool ld)
+for tool in ${TOOLS[@]}
+do
+	if [ ! -e "$IOS_TOOLCHAIN/$tool" ] && [ ! -e "$XCODE_TOOLCHAIN/$tool" ]; then
+		echo "ERROR: unable to find $tool at IOS_TOOLCHAIN or XCODE_TOOLCHAIN"
+		FOUND_ALL=0
+	fi
+done
+
+if [ "$FOUND_ALL" -eq "0" ]; then
+	[ "$0" = "$BASH_SOURCE" ] && exit 1 || return 1
+fi
+
+echo
+echo "*******************************************************************************"
+echo "It looks the the environment is set correctly. Your next step is"
+echo "build the library with 'make -f GNUmakefile-cross'"
+echo "*******************************************************************************"
+echo
+
+[ "$0" = "$BASH_SOURCE" ] && exit 0 || return 0