dev-libs/libtomcrypt: new package

"LibTomCrypt is a fairly comprehensive, modular and portable
cryptographic toolkit"

A number of packages bundle libtomcrypt at the moment.  Finally add
the package, so we can start unbundling.

Original ebuild by Sam James with a few style updates by me.

Closes: https://bugs.gentoo.org/723844
Signed-off-by: Sam James <sam@gentoo.org>
Closes: https://github.com/gentoo/gentoo/pull/18734
Signed-off-by: Michał Górny <mgorny@gentoo.org>

3 files changed, 122 insertions, 0 deletions

diff --git a/dev-libs/libtomcrypt/Manifest b/dev-libs/libtomcrypt/Manifest
new file mode 100644
index 000000000000..71ae48ee0d7c
--- /dev/null
+++ b/dev-libs/libtomcrypt/Manifest
@@ -0,0 +1 @@
+DIST libtomcrypt-1.18.2.tar.xz 2638064 BLAKE2B fad67e9e2a2002425488db9987a853bda631d6638c2cb1052a1d0d1f393945e38037cc75c54cd3a4bf87bb2e13b1e868e81da054a84bbdb393519ddef5e27300 SHA512 f6117a12a42b07f8de4a8aedbccf6ff4ee94b4b81cb7263af99627c32eae646ca8ead7d3063737918db4aa118673001fcf2cfa8e4ca8b528fb00045fda7cc893
diff --git a/dev-libs/libtomcrypt/libtomcrypt-1.18.2.ebuild b/dev-libs/libtomcrypt/libtomcrypt-1.18.2.ebuild
new file mode 100644
index 000000000000..9b87379612a7
--- /dev/null
+++ b/dev-libs/libtomcrypt/libtomcrypt-1.18.2.ebuild
@@ -0,0 +1,102 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit toolchain-funcs
+
+DESCRIPTION="LibTomCrypt is a comprehensive, modular and portable cryptographic toolkit"
+HOMEPAGE="https://www.libtom.net/LibTomCrypt/ https://github.com/libtom/libtomcrypt"
+SRC_URI="
+	https://github.com/libtom/${PN}/releases/download/v${PV}/crypt-${PV}.tar.xz
+		-> ${P}.tar.xz"
+
+LICENSE="|| ( WTFPL-2 public-domain )"
+# Current SONAME is 1
+# Please bump when the ABI changes upstream
+# Helpful site:
+# https://abi-laboratory.pro/index.php?view=timeline&l=libtomcrypt
+SLOT="0/1"
+KEYWORDS="~amd64 ~x86"
+IUSE="+gmp +libtommath tomsfastmath"
+
+BDEPEND="virtual/pkgconfig"
+DEPEND="
+	gmp? ( dev-libs/gmp:= )
+	libtommath? ( dev-libs/libtommath:= )
+	tomsfastmath? ( dev-libs/tomsfastmath:= )
+"
+
+mymake() {
+	# Standard boilerplate
+	# Upstream use homebrewed makefiles
+	# Best to use same args for all, for consistency,
+	# in case behaviour changes (v possible).
+	local enabled_features=()
+	local extra_libs=()
+
+	# Build support as appropriate for consumers (MPI)
+	use gmp && enabled_features+=( -DGMP_DESC=1 )
+	use libtommath && enabled_features+=( -DLTM_DESC=1 )
+	use tomsfastmath && enabled_features+=( -DTFM_DESC=1 )
+
+	# For the test and example binaries, we have to choose
+	# which MPI we want to use.
+	# For now (see src_test), arbitrarily choose:
+	# gmp > libtommath > tomsfastmath > none
+	if use gmp ; then
+		enabled_features+=( -DUSE_GMP=1 )
+		extra_libs=( -lgmp )
+	elif use libtommath ; then
+		enabled_features+=( -DUSE_LTM=1 )
+		extra_libs=( -ltommath )
+	elif use tomsfastmath ; then
+		enabled_features+=( -DUSE_TFM=1 )
+		extra_libs=( -ltfm )
+	fi
+
+	# If none of the above are being used,
+	# the tests don't need to link against any extra
+	# libraries.
+
+	# We only need to do this strange logic for tests
+	# anyway because we're choosing what to build a binary with.
+	if [[ ${TEST} != 1 ]] ; then
+		extra_libs=()
+	fi
+
+	# IGNORE_SPEED=1 is needed to respect CFLAGS
+	EXTRALIBS="${extra_libs}" emake \
+		CFLAGS="${CFLAGS} ${enabled_features[*]}" \
+		CC="$(tc-getCC)" \
+		AR="$(tc-getAR)" \
+		RANLIB="$(tc-getRANLIB)" \
+		LIBPATH="${ESYSROOT}/usr/$(get_libdir)" \
+		INCPATH="${ESYSROOT}/usr/include" \
+		IGNORE_SPEED=1 \
+		"${@}"
+}
+
+src_compile() {
+	mymake -f makefile.shared library
+}
+
+src_test() {
+	# libtomcrypt can build with several MPI providers
+	# but the tests can only be built with one at a time.
+	# When the next release (> 1.18.2) containing
+	# 1) https://github.com/libtom/libtomcrypt/commit/a65cfb8dbe4
+	# 2) https://github.com/libtom/libtomcrypt/commit/fdc6cd20137
+	# is made, we can run tests for each provider.
+	TEST=1 mymake test
+	./test || die "Running tests failed"
+}
+
+src_install() {
+	mymake -f makefile.shared \
+		DATAPATH="${EPREFIX}/usr/share/doc/${PF}" \
+		DESTDIR="${ED}" \
+		install install_docs
+
+	find "${ED}" '(' -name '*.la' -o -name '*.a' ')' -delete || die
+}
diff --git a/dev-libs/libtomcrypt/metadata.xml b/dev-libs/libtomcrypt/metadata.xml
new file mode 100644
index 000000000000..9dda15fd9cfb
--- /dev/null
+++ b/dev-libs/libtomcrypt/metadata.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>sam@gentoo.org</email>
+		<name>Sam James</name>
+	</maintainer>
+	<maintainer type="person">
+		<email>mgorny@gentoo.org</email>
+		<name>Michał Górny</name>
+	</maintainer>
+	<use>
+		<flag name="libtommath">Uses <pkg>dev-libs/libtommath</pkg> for mathematical operations</flag>
+		<flag name="tomsfastmath">Uses <pkg>dev-libs/tomsfastmath</pkg> for mathematical operations</flag>
+	</use>
+	<upstream>
+		<remote-id type="github">libtom/libtomcrypt</remote-id>
+	</upstream>
+</pkgmetadata>