windows-libs: add script to build gcrypt libs package

Tested with MSVC 2015 (Win64) and the WireGuard patches on top of
v2.9.0rc0-1338-g9b9a0d0f88. The decryption suite (43 tests) passes.
README.Wireshark is based on Pascal's instructions from
libgcrypt-1.7.6-win64ws.zip

1 files changed, 80 insertions, 0 deletions

diff --git a/windows-libs/make-libgcrypt-libs-zip.sh b/windows-libs/make-libgcrypt-libs-zip.sh
new file mode 100755
index 0000000..3a5b5d1
--- /dev/null
+++ b/windows-libs/make-libgcrypt-libs-zip.sh
@@ -0,0 +1,80 @@
+#!/bin/bash
+# Create a libgcrypt-*-win??ws.zip file based on MingW packages.
+#
+# Copyright 2018, Peter Wu <peter@lekensteyn.nl>
+#
+# SPDX-License-Identifier: (GPL-2.0-or-later or MIT)
+set -eu
+
+# Debian buster (already contains --disable-padlock-support --disable-asm)
+# https://packages.debian.org/buster/libgpg-error-mingw-w64-dev
+# https://packages.debian.org/buster/libgcrypt-mingw-w64-dev
+# https://salsa.debian.org/debian/libgpg-error/blob/debian/1.32-1/debian/rules
+# https://salsa.debian.org/gnutls-team/libgcrypt/blob/1.8.3-1/debian/rules
+urls=(
+http://ftp.nl.debian.org/debian/pool/main/libg/libgpg-error/libgpg-error-mingw-w64-dev_1.32-1_all.deb
+http://ftp.nl.debian.org/debian/pool/main/libg/libgcrypt20/libgcrypt-mingw-w64-dev_1.8.3-1_all.deb
+)
+version=1.8.3
+
+if [ -e usr ]; then
+    echo "Remove usr/ before proceeding"
+    exit 1
+fi
+
+# 1. Download .deb files if they are missing and verify integrity.
+for url in "${urls[@]}"; do
+    filename="${url##*/}"
+    if [ ! -e "$filename" ]; then
+        echo "Retrieving $url"
+        curl -O "$url"
+    fi
+done
+sha256sum --check <<SHA256
+ff5eae9c905a7a9ca2cdd8ff8334e2a1f5846aa30c0e589b0ee74cd7560472ae  libgcrypt-mingw-w64-dev_1.8.3-1_all.deb
+a4be1f60fa9035db79015ab2f4fa2c222233d19bbdd791ebdeaa3e5934254cae  libgpg-error-mingw-w64-dev_1.32-1_all.deb
+SHA256
+
+# 2. Unpack files.
+for url in "${urls[@]}"; do
+    filename="${url##*/}"
+    bsdtar -xOf "$filename" data.tar.xz |
+    bsdtar -xJvf- usr/x86_64-w64-mingw32 usr/i686-w64-mingw32
+done
+
+# 3. Patch header
+echo "Patching ssize_t in gcrypt.h"
+sed 's,typedef long ssize_t;,/*&*/,' -i usr/*/include/gcrypt.h
+
+# 4. Relocate files and shrink their size.
+# .def files are only needed to create .lib files. Do not bother.
+# However, import libraries (.lib) files must be present.
+for prefix in usr/*; do
+    mv -v "$prefix/lib/libgcrypt.dll.a" "$prefix/bin/libgcrypt-20.lib"
+    mv -v "$prefix/lib/libgpg-error.dll.a" "$prefix/bin/libgpg-error-0.lib"
+    strip "$prefix/bin/"*.dll
+
+    {
+        echo "Downloaded from Debian Buster:"
+        printf "%s\n" "${urls[@]}"
+        printf "\nOther comments:\n"
+        echo "- libgcrypt was compiled with --disable-asm and --disable-padlock-support flags"
+        echo "- the ssize_t typedef was commented out in gcrypt.h; we define it elsewhere"
+        echo "- lib/*.dll.a files were moved to bin/*.lib (including a version number based on the lib/*.dll file)"
+        echo "- the .dll files were stripped (strip bin/*.dll)"
+    } | sed 's/$/\r/' > "$prefix/README.Wireshark"
+done
+
+# 5. Create an archive
+files=(
+"bin/libgcrypt-20.dll"
+"bin/libgcrypt-20.lib"
+"bin/libgpg-error-0.dll"
+"bin/libgpg-error-0.lib"
+"include"
+"README.Wireshark"
+)
+bsdtar -caf "libgcrypt-$version-win32ws.zip" -C usr/i686-w64-mingw32 "${files[@]}"
+bsdtar -caf "libgcrypt-$version-win64ws.zip" -C usr/x86_64-w64-mingw32 "${files[@]}"
+
+ls -l "libgcrypt-$version-win32ws.zip" "libgcrypt-$version-win64ws.zip"