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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2019 Philippe Reynes <philippe.reynes@softathome.com>
*
* Unit tests for aes functions
*/
#include <common.h>
#include <command.h>
#include <hexdump.h>
#include <rand.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 },
{ AES192_KEY_LENGTH, AES192_EXPAND_KEY_LENGTH, TEST_AES_ONE_BLOCK, 1 },
{ AES192_KEY_LENGTH, AES192_EXPAND_KEY_LENGTH, TEST_AES_CBC_CHAIN, 16 },
{ AES256_KEY_LENGTH, AES256_EXPAND_KEY_LENGTH, TEST_AES_ONE_BLOCK, 1 },
{ AES256_KEY_LENGTH, AES256_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);
key_exp = malloc(key_exp_len);
iv = malloc(AES_BLOCK_LENGTH);
nocipher = malloc(num_block * AES_BLOCK_LENGTH);
ciphered = malloc((num_block + 1) * AES_BLOCK_LENGTH);
uncipher = malloc((num_block + 1) * AES_BLOCK_LENGTH);
if (!key || !key_exp || !iv || !nocipher || !ciphered || !uncipher) {
printf("%s: can't allocate memory\n", __func__);
ret = -1;
goto out;
}
/* 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;
};
out:
/* 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);
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