diff --git a/pkg/monocypher/Makefile b/pkg/monocypher/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..c2755659245b527e11622e28a9066230f6cb0394
--- /dev/null
+++ b/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 $(RIOTBASE)/pkg/pkg.mk
diff --git a/pkg/monocypher/Makefile.dep b/pkg/monocypher/Makefile.dep
new file mode 100644
index 0000000000000000000000000000000000000000..767f3cc1c768a82e6bbf890ca16e3d2f1ffb31b0
--- /dev/null
+++ b/pkg/monocypher/Makefile.dep
@@ -0,0 +1 @@
+USEMODULE += monocypher_sha512
diff --git a/pkg/monocypher/Makefile.include b/pkg/monocypher/Makefile.include
new file mode 100644
index 0000000000000000000000000000000000000000..a72d0d8d33b52222e2949f27f3e09485de6081e7
--- /dev/null
+++ b/pkg/monocypher/Makefile.include
@@ -0,0 +1,7 @@
+INCLUDES += -I$(PKGDIRBASE)/monocypher/src
+INCLUDES += -I$(PKGDIRBASE)/monocypher/src/optional
+
+ifneq (,$(filter monocypher_sha512,$(USEMODULE)))
+  CFLAGS += -DED25519_SHA512
+  DIRS += $(PKGDIRBASE)/monocypher/src/optional
+endif
diff --git a/pkg/monocypher/doc.txt b/pkg/monocypher/doc.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b2c39340e436745603a3c92fa5ce98b79010ad65
--- /dev/null
+++ b/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/
+ */
diff --git a/pkg/monocypher/patches/0001-Monocypher-add-riot-makefiles.patch b/pkg/monocypher/patches/0001-Monocypher-add-riot-makefiles.patch
new file mode 100644
index 0000000000000000000000000000000000000000..cba5754d54d0eb463ce219b63d8ae7ba40925091
Binary files /dev/null and b/pkg/monocypher/patches/0001-Monocypher-add-riot-makefiles.patch differ
diff --git a/tests/pkg_monocypher/Makefile b/tests/pkg_monocypher/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..3e1118065c04bdc476c5828db280d73ead36bd94
--- /dev/null
+++ b/tests/pkg_monocypher/Makefile
@@ -0,0 +1,16 @@
+include ../Makefile.tests_common
+
+# No 8 bit and 16 bit support
+BOARD_BLACKLIST := arduino-duemilanove arduino-mega2560 arduino-uno chronos \
+        jiminy-mega256rfr2 mega-xplained msb-430 msb-430h telosb \
+        waspmote-pro wsn430-v1_3b wsn430-v1_4 z1
+
+USEMODULE += embunit
+USEMODULE += random
+USEPKG += monocypher
+
+TEST_ON_CI_WHITELIST += all
+include $(RIOTBASE)/Makefile.include
+
+test:
+	tests/01-run.py
diff --git a/tests/pkg_monocypher/main.c b/tests/pkg_monocypher/main.c
new file mode 100644
index 0000000000000000000000000000000000000000..fc9af4c8f060e2c2ef61776c354040055dc1d4ea
--- /dev/null
+++ b/tests/pkg_monocypher/main.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2018 Freie Universität Berlin
+ * Copyright (C) 2018 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Monocypher package
+ *
+ * @author      Koen Zandberg <koen@bergzand.net>
+ *
+ * @}
+ */
+
+#include <string.h>
+
+#include "monocypher.h"
+#include "embUnit.h"
+#include "random.h"
+
+static uint8_t message[] = "0123456789abcdef";
+
+static uint8_t sign_sk[32];
+static uint8_t sign_pk[32];
+static uint8_t signature[64];
+
+static void setUp(void)
+{
+    random_init(0);
+}
+
+static void test_monocypher_signverify(void)
+{
+    int res;
+    /* Creating keypair ... */
+    random_bytes(sign_sk, sizeof(sign_sk));
+    crypto_sign_public_key(sign_pk, sign_sk);
+
+    /* Sign */
+    crypto_sign(signature, sign_sk, sign_pk, message, sizeof(message));
+
+    /* Verifying... */
+    res = crypto_check(signature, sign_pk, message, sizeof(message));
+    TEST_ASSERT_EQUAL_INT(0, res);
+}
+
+static void test_monocypher_verifynegative(void)
+{
+    int res;
+
+    /* changing message at random position (10) */
+    message[0] = 'A';
+
+    /* Verifying... */
+    res = crypto_check(signature, sign_pk, message, sizeof(message));
+    TEST_ASSERT_EQUAL_INT(-1, res);
+}
+
+Test *tests_monocypher(void)
+{
+    EMB_UNIT_TESTFIXTURES(fixtures) {
+        new_TestFixture(test_monocypher_signverify),
+        new_TestFixture(test_monocypher_verifynegative)
+    };
+
+    EMB_UNIT_TESTCALLER(monocypher_tests, setUp, NULL, fixtures);
+    return (Test*)&monocypher_tests;
+}
+
+int main(void)
+{
+    TESTS_START();
+    TESTS_RUN(tests_monocypher());
+    TESTS_END();
+
+    return 0;
+}
diff --git a/tests/pkg_monocypher/tests/01-run.py b/tests/pkg_monocypher/tests/01-run.py
new file mode 100755
index 0000000000000000000000000000000000000000..d90541ef3962b473db195c66706d968a238164d9
--- /dev/null
+++ b/tests/pkg_monocypher/tests/01-run.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
+# Copyright (C) 2016 Takuo Yonezawa <Yonezawa-T2@mail.dnp.co.jp>
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+import os
+import sys
+
+
+def testfunc(child):
+    child.expect(r"OK \(2 tests\)")
+
+
+if __name__ == "__main__":
+    sys.path.append(os.path.join(os.environ['RIOTBASE'],
+                                 'dist/tools/testrunner'))
+    from testrunner import run
+    sys.exit(run(testfunc))