chacha20poly1305: Provide a test based on the rfc

Add a test case to the crypto tests testing the chacha20poly1305
algorithm with the test vectors from rfc 8439.

tests/unittests/tests-crypto/tests-crypto-chacha20poly1305.c

+/*
+ * Copyright (C) 2018 Koen Zandberg
+ *
+ * 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.
+ */
+
+#include "embUnit/embUnit.h"
+#include "tests-crypto.h"
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "crypto/chacha20poly1305.h"
+
+/* ciphertext buffer */
+uint8_t ebuf[1024];
+/* Plaintext buffer */
+uint8_t pbuf[1024];
+
+static const uint8_t key_1[32] = {
+    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f
+};
+
+static const uint8_t msg_1[] = {
+    0x4c, 0x61, 0x64, 0x69, 0x65, 0x73, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x47, 0x65, 0x6e, 0x74, 0x6c,
+    0x65, 0x6d, 0x65, 0x6e, 0x20, 0x6f, 0x66, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x61, 0x73,
+    0x73, 0x20, 0x6f, 0x66, 0x20, 0x27, 0x39, 0x39, 0x3a, 0x20, 0x49, 0x66, 0x20, 0x49, 0x20, 0x63,
+    0x6f, 0x75, 0x6c, 0x64, 0x20, 0x6f, 0x66, 0x66, 0x65, 0x72, 0x20, 0x79, 0x6f, 0x75, 0x20, 0x6f,
+    0x6e, 0x6c, 0x79, 0x20, 0x6f, 0x6e, 0x65, 0x20, 0x74, 0x69, 0x70, 0x20, 0x66, 0x6f, 0x72, 0x20,
+    0x74, 0x68, 0x65, 0x20, 0x66, 0x75, 0x74, 0x75, 0x72, 0x65, 0x2c, 0x20, 0x73, 0x75, 0x6e, 0x73,
+    0x63, 0x72, 0x65, 0x65, 0x6e, 0x20, 0x77, 0x6f, 0x75, 0x6c, 0x64, 0x20, 0x62, 0x65, 0x20, 0x69,
+    0x74, 0x2e
+};
+
+static const uint8_t aad_1[] = {
+    0x50, 0x51, 0x52, 0x53, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7
+};
+
+static const uint8_t nonce_1[] = {
+    0x07, 0x00, 0x00, 0x00, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47
+};
+
+static const uint8_t ciphertext_1[] = {
+    0xd3, 0x1a, 0x8d, 0x34, 0x64, 0x8e, 0x60, 0xdb, 0x7b, 0x86, 0xaf, 0xbc,
+    0x53, 0xef, 0x7e, 0xc2, 0xa4, 0xad, 0xed, 0x51, 0x29, 0x6e, 0x08, 0xfe,
+    0xa9, 0xe2, 0xb5, 0xa7, 0x36, 0xee, 0x62, 0xd6, 0x3d, 0xbe, 0xa4, 0x5e,
+    0x8c, 0xa9, 0x67, 0x12, 0x82, 0xfa, 0xfb, 0x69, 0xda, 0x92, 0x72, 0x8b,
+    0x1a, 0x71, 0xde, 0x0a, 0x9e, 0x06, 0x0b, 0x29, 0x05, 0xd6, 0xa5, 0xb6,
+    0x7e, 0xcd, 0x3b, 0x36, 0x92, 0xdd, 0xbd, 0x7f, 0x2d, 0x77, 0x8b, 0x8c,
+    0x98, 0x03, 0xae, 0xe3, 0x28, 0x09, 0x1b, 0x58, 0xfa, 0xb3, 0x24, 0xe4,
+    0xfa, 0xd6, 0x75, 0x94, 0x55, 0x85, 0x80, 0x8b, 0x48, 0x31, 0xd7, 0xbc,
+    0x3f, 0xf4, 0xde, 0xf0, 0x8e, 0x4b, 0x7a, 0x9d, 0xe5, 0x76, 0xd2, 0x65,
+    0x86, 0xce, 0xc6, 0x4b, 0x61, 0x16, 0x1a, 0xe1, 0x0b, 0x59, 0x4f, 0x09,
+    0xe2, 0x6a, 0x7e, 0x90, 0x2e, 0xcb, 0xd0, 0x60, 0x06, 0x91,
+};
+
+static void _test_chacha20poly1305(const uint8_t *key, const uint8_t *nonce,
+                                   const uint8_t *msg, size_t msglen,
+                                   const uint8_t *aad, size_t aadlen)
+{
+    memcpy(ebuf, msg, msglen);
+    chacha20poly1305_encrypt(ebuf, msg, msglen, aad, aadlen, key, nonce);
+    TEST_ASSERT_EQUAL_INT(0, memcmp(ebuf, ciphertext_1, msglen + 16));
+    size_t len;
+    TEST_ASSERT_EQUAL_INT(1,
+            chacha20poly1305_decrypt(ebuf, msglen+16, pbuf, &len, aad, aadlen, key, nonce));
+    TEST_ASSERT_EQUAL_INT(0, memcmp(pbuf, msg_1, msglen));
+}
+
+static void test_crypto_chacha20poly1305_1(void)
+{
+    _test_chacha20poly1305(key_1, nonce_1, msg_1, sizeof(msg_1), aad_1, sizeof(aad_1));
+}
+
+Test *tests_crypto_chacha20poly1305_tests(void)
+{
+    EMB_UNIT_TESTFIXTURES(fixtures) {
+        new_TestFixture(test_crypto_chacha20poly1305_1),
+    };
+    EMB_UNIT_TESTCALLER(crypto_chacha20poly1305_tests, NULL, NULL, fixtures);
+    return (Test *) &crypto_chacha20poly1305_tests;
+}

tests/unittests/tests-crypto/tests-crypto.c

@@ -14,6 +14,7 @@ void tests_crypto(void)
     TESTS_RUN(tests_crypto_helper_tests());
     TESTS_RUN(tests_crypto_chacha_tests());
     TESTS_RUN(tests_crypto_poly1305_tests());
+    TESTS_RUN(tests_crypto_chacha20poly1305_tests());
     TESTS_RUN(tests_crypto_aes_tests());
     TESTS_RUN(tests_crypto_cipher_tests());
     TESTS_RUN(tests_crypto_modes_ccm_tests());

tests/unittests/tests-crypto/tests-crypto.h

@@ -48,6 +48,8 @@ Test *tests_crypto_chacha_tests(void);
 
 Test *tests_crypto_poly1305_tests(void);
 
+Test *tests_crypto_chacha20poly1305_tests(void);
+
 static inline int compare(const uint8_t *a, const uint8_t *b, uint8_t len)
 {
     int result = 1;