monocypher: Initial import of package

Support for monocypher as crypto library. Blazing fast performance, but
double the flash requirement compared to TweetNaCl. Stack usage is
around 70% of TweetNaCl

pkg/monocypher/Makefile

@@ -0,0 +1,11 @@
+PKG_NAME=monocypher
+PKG_URL=https://github.com/LoupVaillant/Monocypher
+PKG_VERSION=6c2edbb48a61f43452c48c5f1e3ddabb19af3111
+PKG_LICENSE=CC-0
+
+.PHONY: all
+
+all: git-download
+	$(Q)"$(MAKE)" -C $(PKG_BUILDDIR)/src
+
+include $(RIOTBASE)/pkg/pkg.mk

pkg/monocypher/Makefile.dep

@@ -0,0 +1 @@
+USEMODULE += monocypher_sha512

pkg/monocypher/Makefile.include

@@ -0,0 +1,7 @@
+INCLUDES += -I$(PKGDIRBASE)/monocypher/src
+INCLUDES += -I$(PKGDIRBASE)/monocypher/src/optional
+
+ifneq (,$(filter monocypher_sha512,$(USEMODULE)))
+  CFLAGS += -DED25519_SHA512
+  DIRS += $(PKGDIRBASE)/monocypher/src/optional
+endif

pkg/monocypher/doc.txt

@@ -0,0 +1,40 @@
+/**
+ * @defgroup pkg_monocypher Monocypher cryptographic library
+ * @ingroup  pkg
+ * @brief    Provides the Monocypher cryptographic library.
+ *
+ * # Monocypher RIOT package
+ *
+ * Monocypher is a high performance cryptographic library. It provides functions
+ * for authenticated encryption, hashing, password key derivation, key
+ * exchange, and public key signatures.
+ *
+ * You can find the API and more information
+ * [here](https://monocypher.org/manual)
+ *
+ * ## Requirements
+ *
+ * @note    Monocypher only supports 32bit platforms.
+ *
+ * Monocypher requires around 3K of stack space depending slightly on the
+ * platform, so beware that you're allocating at
+ * least `THREAD_STACKSIZE_DEFAULT + 3072` bytes.
+ *
+ * You can do it easily by adding:
+ *
+ * ```makefile
+ * CFLAGS += '-DTHREAD_STACKSIZE_MAIN=(THREAD_STACKSIZE_DEFAULT + 3072)'
+ * ```
+ *
+ * to your makefile.
+ *
+ * ## Usage
+ *
+ * Just add it as a package in your application:
+ *
+ * ```makefile
+ * USEPKG += monocypher
+ * ```
+ *
+ * @see     https://monocypher.org/
+ */

pkg/monocypher/patches/0001-Monocypher-add-riot-makefiles.patch

@@ -0,0 +1,33 @@
+From a8f8636c0b72d32a931c743d611bba4291a10eb5 Mon Sep 17 00:00:00 2001
+From: Koen Zandberg <koen@bergzand.net>
+Date: Fri, 29 Jun 2018 15:33:52 +0200
+Subject: [PATCH] Monocypher: add riot makefiles
+
+---
+ src/Makefile          | 3 +++
+ src/optional/Makefile | 3 +++
+ 2 files changed, 6 insertions(+)
+ create mode 100644 src/Makefile
+ create mode 100644 src/optional/Makefile
+
+diff --git a/src/Makefile b/src/Makefile
+new file mode 100644
+index 0000000..c0f8d6c
+--- /dev/null
++++ b/src/Makefile
+@@ -0,0 +1,3 @@
++MODULE := monocypher
++
++include $(RIOTBASE)/Makefile.base
+diff --git a/src/optional/Makefile b/src/optional/Makefile
+new file mode 100644
+index 0000000..784d588
+--- /dev/null
++++ b/src/optional/Makefile
+@@ -0,0 +1,3 @@
++MODULE := monocypher_sha512
++
++include $(RIOTBASE)/Makefile.base
+-- 
+2.16.4
+