test/lib/test_aes.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2019 Philippe Reynes <philippe.reynes@softathome.com>
   4  *
   5  * Unit tests for aes functions
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <hexdump.h>
  11 #include <uboot_aes.h>
  12 #include <test/lib.h>
  13 #include <test/test.h>
  14 #include <test/ut.h>
  15
  16 #define TEST_AES_ONE_BLOCK              0
  17 #define TEST_AES_CBC_CHAIN              1
  18
  19 struct test_aes_s {
  20         int key_len;
  21         int key_exp_len;
  22         int type;
  23         int num_block;
  24 };
  25
  26 static struct test_aes_s test_aes[] = {
  27         { AES128_KEY_LENGTH, AES128_EXPAND_KEY_LENGTH, TEST_AES_ONE_BLOCK,  1 },
  28         { AES128_KEY_LENGTH, AES128_EXPAND_KEY_LENGTH, TEST_AES_CBC_CHAIN, 16 },
  29         { AES192_KEY_LENGTH, AES192_EXPAND_KEY_LENGTH, TEST_AES_ONE_BLOCK,  1 },
  30         { AES192_KEY_LENGTH, AES192_EXPAND_KEY_LENGTH, TEST_AES_CBC_CHAIN, 16 },
  31         { AES256_KEY_LENGTH, AES256_EXPAND_KEY_LENGTH, TEST_AES_ONE_BLOCK,  1 },
  32         { AES256_KEY_LENGTH, AES256_EXPAND_KEY_LENGTH, TEST_AES_CBC_CHAIN, 16 },
  33 };
  34
  35 static void rand_buf(u8 *buf, int size)
  36 {
  37         int i;
  38
  39         for (i = 0; i < size; i++)
  40                 buf[i] = rand() & 0xff;
  41 }
  42
  43 static int lib_test_aes_one_block(struct unit_test_state *uts, int key_len,
  44                                   u8 *key_exp, u8 *iv, int num_block,
  45                                   u8 *nocipher, u8 *ciphered, u8 *uncipher)
  46 {
  47         aes_encrypt(key_len, nocipher, key_exp, ciphered);
  48         aes_decrypt(key_len, ciphered, key_exp, uncipher);
  49
  50         ut_asserteq_mem(nocipher, uncipher, AES_BLOCK_LENGTH);
  51
  52         /* corrupt the expanded key */
  53         key_exp[0]++;
  54         aes_decrypt(key_len, ciphered, key_exp, uncipher);
  55         ut_assertf(memcmp(nocipher, uncipher, AES_BLOCK_LENGTH),
  56                    "nocipher and uncipher should be different\n");
  57
  58         return 0;
  59 }
  60
  61 static int lib_test_aes_cbc_chain(struct unit_test_state *uts, int key_len,
  62                                   u8 *key_exp, u8 *iv, int num_block,
  63                                   u8 *nocipher, u8 *ciphered, u8 *uncipher)
  64 {
  65         aes_cbc_encrypt_blocks(key_len, key_exp, iv,
  66                                nocipher, ciphered, num_block);
  67         aes_cbc_decrypt_blocks(key_len, key_exp, iv,
  68                                ciphered, uncipher, num_block);
  69
  70         ut_asserteq_mem(nocipher, uncipher, num_block * AES_BLOCK_LENGTH);
  71
  72         /* corrupt the expanded key */
  73         key_exp[0]++;
  74         aes_cbc_decrypt_blocks(key_len, key_exp, iv,
  75                                ciphered, uncipher, num_block);
  76         ut_assertf(memcmp(nocipher, uncipher, num_block * AES_BLOCK_LENGTH),
  77                    "nocipher and uncipher should be different\n");
  78
  79         return 0;
  80 }
  81
  82 static int _lib_test_aes_run(struct unit_test_state *uts, int key_len,
  83                              int key_exp_len, int type, int num_block)
  84 {
  85         u8 *key, *key_exp, *iv;
  86         u8 *nocipher, *ciphered, *uncipher;
  87         int ret;
  88
  89         /* Allocate all the buffer */
  90         key = malloc(key_len);
  91         key_exp = malloc(key_exp_len);
  92         iv = malloc(AES_BLOCK_LENGTH);
  93         nocipher = malloc(num_block * AES_BLOCK_LENGTH);
  94         ciphered = malloc((num_block + 1) * AES_BLOCK_LENGTH);
  95         uncipher = malloc((num_block + 1) * AES_BLOCK_LENGTH);
  96
  97         if (!key || !key_exp || !iv || !nocipher || !ciphered || !uncipher) {
  98                 printf("%s: can't allocate memory\n", __func__);
  99                 ret = -1;
 100                 goto out;
 101         }
 102
 103         /* Initialize all buffer */
 104         rand_buf(key, key_len);
 105         rand_buf(iv, AES_BLOCK_LENGTH);
 106         rand_buf(nocipher, num_block * AES_BLOCK_LENGTH);
 107         memset(ciphered, 0, (num_block + 1) * AES_BLOCK_LENGTH);
 108         memset(uncipher, 0, (num_block + 1) * AES_BLOCK_LENGTH);
 109
 110         /* Expand the key */
 111         aes_expand_key(key, key_len, key_exp);
 112
 113         /* Encrypt and decrypt */
 114         switch (type) {
 115         case TEST_AES_ONE_BLOCK:
 116                 ret = lib_test_aes_one_block(uts, key_len, key_exp, iv,
 117                                              num_block, nocipher,
 118                                              ciphered, uncipher);
 119                 break;
 120         case TEST_AES_CBC_CHAIN:
 121                 ret = lib_test_aes_cbc_chain(uts, key_len, key_exp, iv,
 122                                              num_block, nocipher,
 123                                              ciphered, uncipher);
 124                 break;
 125         default:
 126                 printf("%s: unknown type (type=%d)\n", __func__, type);
 127                 ret = -1;
 128         };
 129
 130  out:
 131         /* Free all the data */
 132         free(key);
 133         free(key_exp);
 134         free(iv);
 135         free(nocipher);
 136         free(ciphered);
 137         free(uncipher);
 138
 139         return ret;
 140 }
 141
 142 static int lib_test_aes_run(struct unit_test_state *uts,
 143                             struct test_aes_s *test)
 144 {
 145         int key_len = test->key_len;
 146         int key_exp_len = test->key_exp_len;
 147         int type = test->type;
 148         int num_block = test->num_block;
 149
 150         return _lib_test_aes_run(uts, key_len, key_exp_len,
 151                                  type, num_block);
 152 }
 153
 154 static int lib_test_aes(struct unit_test_state *uts)
 155 {
 156         int i, ret = 0;
 157
 158         for (i = 0; i < ARRAY_SIZE(test_aes); i++) {
 159                 ret = lib_test_aes_run(uts, &test_aes[i]);
 160                 if (ret)
 161                         break;
 162         }
 163
 164         return ret;
 165 }
 166
 167 LIB_TEST(lib_test_aes, 0);