tests/prng_sha256prng: add test application

tests/prng_sha256prng/Makefile

@@ -0,0 +1,6 @@
+include ../Makefile.tests_common
+
+USEMODULE += random
+USEMODULE += prng_sha256prng
+
+include $(RIOTBASE)/Makefile.include

tests/prng_sha256prng/main.c

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2020 HAW Hamburg
+ *
+ * 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.
+ */
+
+/**
+ *
+ * @file
+ * @brief       Test cases for the SHA256PRNG pseudo random number generator
+ *
+ * @author      Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "kernel_defines.h"
+#include "random.h"
+
+/**
+ * @brief expected sequence for seed=1. This is only a regression test. The
+ *        expected output was generated while porting the SHA256PRNG to RIOT.
+ */
+static const uint32_t seq_seed1[] =
+   {1106729202, 3855353741,  932558076,  213257261, 1935649068, 3223344939,
+    3700960722, 3580154139, 3802991633, 3783537878, 3862557448, 3401019389,
+    3269475530,  260491589, 2254706846, 3754733214, 1693392656, 3020931263,
+    2202015546, 2031345158};
+/**
+ * @brief expected sequence for seed=11799121 (generated at random.org). This is
+ *        only a regression test. The expected output was generated while porting
+ *        the SHA256PRNG to RIOT.
+ */
+static const uint8_t seq_seed2[] =
+   {0x04, 0x8b, 0xc0, 0x91, 0x7b, 0x08, 0x4a, 0x2f, 0x8f, 0x9a, 0xd0, 0xa6, 0x65, 0x18,
+    0x7b, 0x89, 0x9b, 0x74, 0x52, 0x45, 0x44, 0x74, 0xbd, 0x4a, 0x0c, 0x74, 0x8a, 0x0e,
+    0xee, 0xdc, 0x76, 0x50, 0x67, 0xe8, 0x50, 0xce, 0x26, 0xdb, 0x0d, 0xef, 0x33, 0x38,
+    0xba, 0x6b, 0x68, 0x8d, 0x5d, 0x83, 0xfd, 0xe3, 0xef, 0x19, 0x20, 0x59, 0xd9, 0xc9,
+    0x12, 0x6b, 0x5f, 0x8c, 0xf9, 0x05, 0x36, 0x8f};
+
+static void test_prng_sha256prng_seed1_u32(void)
+{
+    uint32_t seed = 1;
+    uint32_t test32[ARRAY_SIZE(seq_seed1)];
+
+    random_init(seed);
+
+    /* request random samples */
+    for (unsigned i = 0; i < ARRAY_SIZE(seq_seed1); i++) {
+        test32[i] = random_uint32();
+    }
+
+    /* compare generator output and reference */
+    if (!(memcmp(test32, seq_seed1, sizeof(seq_seed1)))) {
+        printf("%s:SUCCESS\n", __func__);
+    }
+    else {
+        printf("%s:FAILURE\n", __func__);
+    }
+}
+
+static void test_prng_sha256prng_seed2_u8(void)
+{
+    uint32_t seed = 11799121;
+    uint8_t test8[sizeof(seq_seed2)];
+
+    random_init(seed);
+
+    /* request random bytes */
+    random_bytes(test8, sizeof(seq_seed2));
+
+    /* compare generator output and reference */
+    if (!(memcmp(test8, seq_seed2, sizeof(seq_seed2)))) {
+        printf("%s:SUCCESS\n", __func__);
+    }
+    else {
+        printf("%s:FAILURE\n", __func__);
+    }
+}
+
+int main(void)
+{
+    test_prng_sha256prng_seed1_u32();
+    test_prng_sha256prng_seed2_u8();
+
+    return 0;
+}

tests/prng_sha256prng/tests/01-run.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2020 HAW Hamburg
+#
+# 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("test_prng_sha256prng_seed1_u32:SUCCESS\r\n")
+    child.expect("test_prng_sha256prng_seed2_u8:SUCCESS\r\n")
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))