From 7842c3dc6fa360871c67e1daa77de69c01a278e1 Mon Sep 17 00:00:00 2001
From: Einhornhool <26007369+Einhornhool@users.noreply.github.com>
Date: Tue, 28 Jan 2020 18:32:47 +0100
Subject: [PATCH] tests: add pkg_cryptoauthlib_compare_sha256

---
 .../pkg_cryptoauthlib_compare_sha256/Makefile | 11 +++
 tests/pkg_cryptoauthlib_compare_sha256/main.c | 89 +++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 tests/pkg_cryptoauthlib_compare_sha256/Makefile
 create mode 100644 tests/pkg_cryptoauthlib_compare_sha256/main.c

diff --git a/tests/pkg_cryptoauthlib_compare_sha256/Makefile b/tests/pkg_cryptoauthlib_compare_sha256/Makefile
new file mode 100644
index 0000000000..99e6d5bd60
--- /dev/null
+++ b/tests/pkg_cryptoauthlib_compare_sha256/Makefile
@@ -0,0 +1,11 @@
+include ../Makefile.tests_common
+
+# Test fails to build for these boards fails due to
+# redefinition of define AES_COUNT in library, which
+# is also defined in efm32 header files
+BOARD_BLACKLIST := stk3600 stk3700
+
+USEPKG += cryptoauthlib
+USEMODULE += hashes
+
+include $(RIOTBASE)/Makefile.include
diff --git a/tests/pkg_cryptoauthlib_compare_sha256/main.c b/tests/pkg_cryptoauthlib_compare_sha256/main.c
new file mode 100644
index 0000000000..6cd744e921
--- /dev/null
+++ b/tests/pkg_cryptoauthlib_compare_sha256/main.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       This test was written to compare the runtime of the RIOT software
+ *              implementation and the CryptoAuth hardware implementation of SHA-256.
+ *
+ * @author      Lena Boeckmann <lena.boeckmann@haw-hamburg.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "hashes/sha256.h"
+#include "atca.h"
+#include "atca_params.h"
+
+#define SHA256_HASH_SIZE (32)
+
+/**
+ * Function to call RIOT software implementation of SHA-256
+ */
+static int test_riot_sha256(uint8_t *teststring, uint16_t len,
+                            uint8_t *expected,
+                            uint8_t *result)
+{
+    sha256_context_t ctx;
+
+    sha256_init(&ctx);
+    sha256_update(&ctx, (void *)teststring, len);
+    sha256_final(&ctx, result);
+    return memcmp(expected, result, SHA256_HASH_SIZE);
+}
+
+/**
+ * Function to call CryptoAuth hardware implementation of SHA-256
+ */
+static int test_atca_sha(uint8_t *teststring, uint16_t len, uint8_t *expected,
+                         uint8_t *result)
+{
+    atcab_sha_start();
+    atcab_sha_end(result, len, teststring);
+    return memcmp(expected, result, SHA256_HASH_SIZE);
+}
+
+int main(void)
+{
+    uint8_t teststring[] = "chili cheese fries";
+    uint8_t expected[] =
+    { 0x36, 0x46, 0xEF, 0xD6, 0x27, 0x6C, 0x0D, 0xCB, 0x4B, 0x07, 0x73, 0x41,
+      0x88, 0xF4, 0x17, 0xB4, 0x38, 0xAA, 0xCF, 0xC6, 0xAE, 0xEF, 0xFA, 0xBE,
+      0xF3, 0xA8, 0x5D, 0x67, 0x42, 0x0D, 0xFE, 0xE5 };
+
+    uint8_t result[SHA256_HASH_SIZE];                       /* +3 to fit 1 byte length and 2 bytes checksum */
+
+    memset(result, 0, SHA256_HASH_SIZE);                    /* alles in result auf 0 setzen */
+
+    uint16_t test_string_size = (sizeof(teststring) - 1);   /* -1 to ignore \0 */
+
+    if (test_riot_sha256(teststring, test_string_size, expected, result) == 0) {
+        printf("RIOT SHA256: Success\n");
+    }
+    else {
+        printf("RIOT SHA256: Failure.\n");
+    }
+    atca_delay_us(10);
+    memset(result, 0, SHA256_HASH_SIZE);
+
+    if (test_atca_sha(teststring, test_string_size, expected, result) == 0) {
+        printf("ATCA SHA256: Success\n");
+    }
+    else {
+        printf("ATCA SHA256: Failure.\n");
+    }
+
+    return 0;
+}