[PATCH V4 3/4] aes: add test unit for aes128

[Philippe Reynes]

This commit add test unit for aes128.

Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
---
 test/lib/Makefile   |   1 +
 test/lib/test_aes.c | 162 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 163 insertions(+)
 create mode 100644 test/lib/test_aes.c

Changelog:
v4:
- Put test/ headers at the end (feedback from Simon)
v3:
- new patch in this serie (in the previous version, the test to
  aes was added to pytest, now, we add test unit for aes as proposed by Simon)

diff --git a/test/lib/Makefile b/test/lib/Makefile
index 72d2ec7..230068d 100644
--- a/test/lib/Makefile
+++ b/test/lib/Makefile
@@ -8,3 +8,4 @@ obj-y += lmb.o
 obj-y += string.o
 obj-$(CONFIG_ERRNO_STR) += test_errno_str.o
 obj-$(CONFIG_UT_LIB_ASN1) += asn1.o
+obj-$(CONFIG_AES) += test_aes.o
diff --git a/test/lib/test_aes.c b/test/lib/test_aes.c
new file mode 100644
index 0000000..2b0e894
--- /dev/null
+++ b/test/lib/test_aes.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2019 Philippe Reynes <philippe.reynes at softathome.com>
+ *
+ * Unit tests for aes functions
+ */
+
+#include <common.h>
+#include <command.h>
+#include <hexdump.h>
+#include <uboot_aes.h>
+#include <test/lib.h>
+#include <test/test.h>
+#include <test/ut.h>
+
+#define TEST_AES_ONE_BLOCK		0
+#define TEST_AES_CBC_CHAIN		1
+
+struct test_aes_s {
+	int key_len;
+	int key_exp_len;
+	int type;
+	int num_block;
+};
+
+static struct test_aes_s test_aes[] = {
+	{ AES128_KEY_LENGTH, AES128_EXPAND_KEY_LENGTH, TEST_AES_ONE_BLOCK,  1 },
+	{ AES128_KEY_LENGTH, AES128_EXPAND_KEY_LENGTH, TEST_AES_CBC_CHAIN, 16 },
+};
+
+static void rand_buf(u8 *buf, int size)
+{
+	int i;
+
+	for (i = 0; i < size; i++)
+		buf[i] = rand() & 0xff;
+}
+
+static int lib_test_aes_one_block(struct unit_test_state *uts, int key_len,
+				  u8 *key_exp, u8 *iv, int num_block,
+				  u8 *nocipher, u8 *ciphered, u8 *uncipher)
+{
+	aes_encrypt(key_len, nocipher, key_exp, ciphered);
+	aes_decrypt(key_len, ciphered, key_exp, uncipher);
+
+	ut_asserteq_mem(nocipher, uncipher, AES_BLOCK_LENGTH);
+
+	/* corrupt the expanded key */
+	key_exp[0]++;
+	aes_decrypt(key_len, ciphered, key_exp, uncipher);
+	ut_assertf(memcmp(nocipher, uncipher, AES_BLOCK_LENGTH),
+		   "nocipher and uncipher should be different\n");
+
+	return 0;
+}
+
+static int lib_test_aes_cbc_chain(struct unit_test_state *uts, int key_len,
+				  u8 *key_exp, u8 *iv, int num_block,
+				  u8 *nocipher, u8 *ciphered, u8 *uncipher)
+{
+	aes_cbc_encrypt_blocks(key_len, key_exp, iv,
+			       nocipher, ciphered, num_block);
+	aes_cbc_decrypt_blocks(key_len, key_exp, iv,
+			       ciphered, uncipher, num_block);
+
+	ut_asserteq_mem(nocipher, uncipher, num_block * AES_BLOCK_LENGTH);
+
+	/* corrupt the expanded key */
+	key_exp[0]++;
+	aes_cbc_decrypt_blocks(key_len, key_exp, iv,
+			       ciphered, uncipher, num_block);
+	ut_assertf(memcmp(nocipher, uncipher, num_block * AES_BLOCK_LENGTH),
+		   "nocipher and uncipher should be different\n");
+
+	return 0;
+}
+
+static int _lib_test_aes_run(struct unit_test_state *uts, int key_len,
+			     int key_exp_len, int type, int num_block)
+{
+	u8 *key, *key_exp, *iv;
+	u8 *nocipher, *ciphered, *uncipher;
+	int ret;
+
+	/* Allocate all the buffer */
+	key = malloc(key_len);
+	ut_assertnonnull(key);
+	key_exp = malloc(key_exp_len);
+	ut_assertnonnull(key_exp);
+	iv = malloc(AES_BLOCK_LENGTH);
+	ut_assertnonnull(iv);
+	nocipher = malloc(num_block * AES_BLOCK_LENGTH);
+	ut_assertnonnull(nocipher);
+	ciphered = malloc((num_block + 1) * AES_BLOCK_LENGTH);
+	ut_assertnonnull(ciphered);
+	uncipher = malloc((num_block + 1) * AES_BLOCK_LENGTH);
+	ut_assertnonnull(uncipher);
+
+	/* Initialize all buffer */
+	rand_buf(key, key_len);
+	rand_buf(iv, AES_BLOCK_LENGTH);
+	rand_buf(nocipher, num_block * AES_BLOCK_LENGTH);
+	memset(ciphered, 0, (num_block + 1) * AES_BLOCK_LENGTH);
+	memset(uncipher, 0, (num_block + 1) * AES_BLOCK_LENGTH);
+
+	/* Expand the key */
+	aes_expand_key(key, key_len, key_exp);
+
+	/* Encrypt and decrypt */
+	switch (type) {
+	case TEST_AES_ONE_BLOCK:
+		ret = lib_test_aes_one_block(uts, key_len, key_exp, iv,
+					     num_block, nocipher,
+					     ciphered, uncipher);
+		break;
+	case TEST_AES_CBC_CHAIN:
+		ret = lib_test_aes_cbc_chain(uts, key_len, key_exp, iv,
+					     num_block, nocipher,
+					     ciphered, uncipher);
+		break;
+	default:
+		printf("%s: unknown type (type=%d)\n", __func__, type);
+		ret = -1;
+	};
+
+	/* Free all the data */
+	free(key);
+	free(key_exp);
+	free(iv);
+	free(nocipher);
+	free(ciphered);
+	free(uncipher);
+
+	return ret;
+}
+
+static int lib_test_aes_run(struct unit_test_state *uts,
+			    struct test_aes_s *test)
+{
+	int key_len = test->key_len;
+	int key_exp_len = test->key_exp_len;
+	int type = test->type;
+	int num_block = test->num_block;
+
+	return _lib_test_aes_run(uts, key_len, key_exp_len,
+				 type, num_block);
+}
+
+static int lib_test_aes(struct unit_test_state *uts)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < ARRAY_SIZE(test_aes); i++) {
+		ret = lib_test_aes_run(uts, &test_aes[i]);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+LIB_TEST(lib_test_aes, 0);
-- 
2.7.4