diff --git a/pkg/libhydrogen/Makefile b/pkg/libhydrogen/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..12abf19121e00002e7304e3a0450c92d5ab5a7ba
--- /dev/null
+++ b/pkg/libhydrogen/Makefile
@@ -0,0 +1,15 @@
+PKG_NAME = libhydrogen
+PKG_URL = https://github.com/jedisct1/libhydrogen
+PKG_VERSION = 39eb529905ce118b674a7723c0d2b48074b9986d
+PKG_LICENSE = ISC
+
+# This warning is triggered on non-32bit platforms
+CFLAGS += -Wno-type-limits
+
+.PHONY: all
+
+all: git-download
+ "$(MAKE)" -C $(PKG_BUILDDIR) \
+ -f $(RIOTPKG)/libhydrogen/Makefile.$(PKG_NAME)
+
+include $(RIOTBASE)/pkg/pkg.mk
diff --git a/pkg/libhydrogen/Makefile.dep b/pkg/libhydrogen/Makefile.dep
new file mode 100644
index 0000000000000000000000000000000000000000..3941d5a187d09be8ecd5738c6d9b7f8e34a8e88e
--- /dev/null
+++ b/pkg/libhydrogen/Makefile.dep
@@ -0,0 +1 @@
+USEMODULE += random
diff --git a/pkg/libhydrogen/Makefile.include b/pkg/libhydrogen/Makefile.include
new file mode 100644
index 0000000000000000000000000000000000000000..ff9e750134c58d33454ddf2f15408dd67afc0a8a
--- /dev/null
+++ b/pkg/libhydrogen/Makefile.include
@@ -0,0 +1 @@
+INCLUDES += -I$(PKGDIRBASE)/libhydrogen
diff --git a/pkg/libhydrogen/Makefile.libhydrogen b/pkg/libhydrogen/Makefile.libhydrogen
new file mode 100644
index 0000000000000000000000000000000000000000..eee65bb3501aad095155e4474eddb578cc056230
--- /dev/null
+++ b/pkg/libhydrogen/Makefile.libhydrogen
@@ -0,0 +1,3 @@
+MODULE = libhydrogen
+
+include $(RIOTBASE)/Makefile.base
diff --git a/pkg/libhydrogen/doc.txt b/pkg/libhydrogen/doc.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2555e9eb166a346caf0cad95630b2556cfba5c81
--- /dev/null
+++ b/pkg/libhydrogen/doc.txt
@@ -0,0 +1,30 @@
+/**
+ * @defgroup pkg_libhydrogen LibHydrogen cryptographic library
+ * @ingroup pkg
+ * @brief A lightweight, secure, easy-to-use crypto library suitable for constrained environments.
+ *
+ * # LibHydrogen RIOT package
+ *
+ * The Hydrogen library is a small, easy-to-use, hard-to-misuse cryptographic
+ * library. It provides functions for random numbers, generic hashing, key
+ * derivation, secret-key encryption, public-key signatures, key exchange and
+ * password hashing.
+ *
+ * Full documentation can be found on the [LibHydrogen wiki](https://github.com/jedisct1/libhydrogen/wiki).
+ *
+ * ## Usage
+ *
+ * Add it as a package in your application's Makefile:
+ *
+ * ```makefile
+ * USEPKG += libhydrogen
+ * ```
+ *
+ * Include the LibHydrogen header in your code:
+ *
+ * ```c
+ * #include "hydrogen.h"
+ * ```
+ *
+ * @see https://github.com/jedisct1/libhydrogen
+ */
diff --git a/pkg/libhydrogen/patches/0001-Add-support-for-RIOT-OS.patch b/pkg/libhydrogen/patches/0001-Add-support-for-RIOT-OS.patch
new file mode 100644
index 0000000000000000000000000000000000000000..2bc841db0f64e501125692e63aebc4e4ceef878e
Binary files /dev/null and b/pkg/libhydrogen/patches/0001-Add-support-for-RIOT-OS.patch differ
diff --git a/tests/pkg_libhydrogen/Makefile b/tests/pkg_libhydrogen/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..4335d5144b0c2ff32ee6624527e584b0d62ab4ca
--- /dev/null
+++ b/tests/pkg_libhydrogen/Makefile
@@ -0,0 +1,14 @@
+include ../Makefile.tests_common
+
+# AVR boards: require avr-gcc >= 7.0 (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60040)
+# MSP430 boards: invalid alignment of 'hydro_random_context'
+BOARD_BLACKLIST := arduino-duemilanove arduino-mega2560 arduino-uno \
+ jiminy-mega256rfr2 mega-xplained waspmote-pro \
+ chronos msb-430 msb-430h telosb wsn430-v1_3b wsn430-v1_4 z1
+
+TEST_ON_CI_WHITELIST += all
+
+USEPKG += libhydrogen
+USEMODULE += embunit
+
+include $(RIOTBASE)/Makefile.include
diff --git a/tests/pkg_libhydrogen/main.c b/tests/pkg_libhydrogen/main.c
new file mode 100644
index 0000000000000000000000000000000000000000..486e0514b55c6ced141c82af35a19ad6fadc76c6
--- /dev/null
+++ b/tests/pkg_libhydrogen/main.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2018 Silke Hofstra
+ *
+ * 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 Test the libhydrogen package
+ *
+ * @author Silke Hofstra <silke@slxh.eu>
+ *
+ * @}
+ */
+
+#include "embUnit.h"
+#include "hydrogen.h"
+
+static char context[] = "examples";
+static char message[] = "0123456789abcdef";
+
+/* This performs setup, but should never fail */
+static void test_hydro_init(void)
+{
+ TEST_ASSERT(hydro_init() == 0);
+}
+
+/* Test public-key signatures */
+static void test_hydro_signverify(void)
+{
+ hydro_sign_keypair key_pair;
+
+ hydro_sign_keygen(&key_pair);
+
+ uint8_t signature[hydro_sign_BYTES];
+
+ hydro_sign_create(signature, message, sizeof message, context, key_pair.sk);
+
+ int res = hydro_sign_verify(signature, message, sizeof message, context, key_pair.pk);
+
+ TEST_ASSERT(res == 0);
+}
+
+/* Test secret-key encryption */
+static void test_hydro_secretbox_encryptdecrypt(void)
+{
+ uint8_t key[hydro_secretbox_KEYBYTES];
+ uint8_t ciphertext[hydro_secretbox_HEADERBYTES + sizeof message];
+
+ hydro_secretbox_keygen(key);
+ hydro_secretbox_encrypt(ciphertext, message, sizeof message, 0, context, key);
+
+ char decrypted[sizeof message];
+ int res = hydro_secretbox_decrypt(
+ decrypted,
+ ciphertext,
+ hydro_secretbox_HEADERBYTES + sizeof message,
+ 0,
+ context,
+ key
+ );
+
+ TEST_ASSERT(res == 0);
+}
+
+Test *tests_libhydrogen(void)
+{
+ EMB_UNIT_TESTFIXTURES(fixtures) {
+ new_TestFixture(test_hydro_init),
+ new_TestFixture(test_hydro_signverify),
+ new_TestFixture(test_hydro_secretbox_encryptdecrypt),
+ };
+ EMB_UNIT_TESTCALLER(libhydrogen_tests, NULL, NULL, fixtures);
+ return (Test *)&libhydrogen_tests;
+}
+
+int main(void)
+{
+ TESTS_START();
+ TESTS_RUN(tests_libhydrogen());
+ TESTS_END();
+ return 0;
+}
diff --git a/tests/pkg_libhydrogen/tests/01-run.py b/tests/pkg_libhydrogen/tests/01-run.py
new file mode 100755
index 0000000000000000000000000000000000000000..a9078c0d97c6d51ea0b087e4e9e764905d195f4c
--- /dev/null
+++ b/tests/pkg_libhydrogen/tests/01-run.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2017 Freie Universität Berlin
+#
+# 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 sys
+from testrunner import run
+
+
+def testfunc(child):
+ child.expect_exact('OK (3 tests)')
+
+
+if __name__ == "__main__":
+ sys.exit(run(testfunc))