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Code Issues Releases Activity

Add memcmp result checks to avoid gcc optimization

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This commit is contained in:
shchmue 2020-05-18 16:51:37 -06:00
parent 4a69ea1922
commit afd17a13ba
4 changed files with 6 additions and 14 deletions
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2
source/keys/key_sources.inl
View file

@ -14,7 +14,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
static const u8 zeros[0x10] = {0};
static u8 zeros[0x10] = {0};
static const u8 keyblob_key_source[][0x10] = {
{0xDF, 0x20, 0x6F, 0x59, 0x44, 0x54, 0xEF, 0xDC, 0x70, 0x74, 0x48, 0x3B, 0x0D, 0xED, 0x9F, 0xD3}, //1.0.0

14
source/keys/keys.c
View file

@ -84,7 +84,7 @@ static inline u32 _read_le_u32(const void *buffer, u32 offset) {
}
// key functions
static bool _key_exists(const void *data) { return memcmp(data, zeros, 0x10); };
static int _key_exists(const void *data) { return memcmp(data, zeros, 0x10) != 0; };
static void _save_key(const char *name, const void *data, u32 len, char *outbuf);
static void _save_key_family(const char *name, const void *data, u32 start_key, u32 num_keys, u32 len, char *outbuf);
static void _generate_kek(u32 ks, const void *key_source, void *master_key, const void *kek_seed, const void *key_seed);
@ -334,7 +334,7 @@ get_tsec: ;
emummc_storage_read(&storage, 0x180000 / NX_EMMC_BLOCKSIZE + i, 1, keyblob_block);
se_aes_key_set(3, keyblob_mac_key[i], 0x10);
se_aes_cmac(3, keyblob_mac, 0x10, keyblob_block + 0x10, 0xa0);
if (memcmp(keyblob_block, keyblob_mac, 0x10)) {
if (memcmp(keyblob_block, keyblob_mac, 0x10) != 0) {
EPRINTFARGS("Keyblob %x corrupt.", i);
gfx_hexdump(i, keyblob_block, 0x10);
gfx_hexdump(i, keyblob_mac, 0x10);
@ -527,8 +527,6 @@ pkg2_done:
for (u32 j = 0; j < 3; j++) {
_generate_kek(8, fs_keys[2 + j], master_key[i], aes_kek_generation_source, NULL);
se_aes_crypt_block_ecb(8, 0, key_area_key[j][i], aes_key_generation_source);
if (j == 2)
gfx_hexdump(i, key_area_key[j][i], 0x10);
}
}
se_aes_key_set(8, master_key[i], 0x10);
@ -936,7 +934,7 @@ get_titlekeys:
u8 *db = M + 0x21;
_mgf1_xor(salt, 0x20, db, 0xdf);
_mgf1_xor(db, 0xdf, salt, 0x20);
if (memcmp(db, null_hash, 0x20))
if (memcmp(db, null_hash, 0x20) != 0)
continue;
memcpy(titlekeys + 0x10 * _titlekey_count, db + 0xcf, 0x10);
_titlekey_count++;
@ -1090,14 +1088,8 @@ static void _save_key(const char *name, const void *data, u32 len, char *outbuf)
static void _save_key_family(const char *name, const void *data, u32 start_key, u32 num_keys, u32 len, char *outbuf) {
char temp_name[0x40] = {0};
if (memcmp(name, "key_area_key_system", 19) == 0) {
gfx_hexdump(0, data, num_keys * 0x10);
}
for (u32 i = 0; i < num_keys; i++) {
sprintf(temp_name, "%s_%02x", name, i + start_key);
if (memcmp(name, "key_area_key_system", 19) == 0) {
gfx_printf("attempt save key %x\n", i);
}
_save_key(temp_name, data + i * len, len, outbuf);
}
}

2
source/keys/save.c
View file

@ -279,7 +279,7 @@ void save_ivfc_storage_read(integrity_verification_storage_ctx_t *ctx, void *buf
hash[0x1F] |= 0x80;
free(data_buffer);
if (memcmp(hash_buffer, hash, 0x20)) {
if (memcmp(hash_buffer, hash, 0x20) != 0) {
ctx->block_validities[block_index] = VALIDITY_INVALID;
} else {
ctx->block_validities[block_index] = VALIDITY_VALID;

2
source/main.c
View file

@ -237,7 +237,7 @@ void launch_tools()
if (file_sec)
{
if (memcmp("sd:/", file_sec, 4))
if (memcmp("sd:/", file_sec, 4) != 0)
{
memcpy(dir + strlen(dir), "/", 2);
memcpy(dir + strlen(dir), file_sec, strlen(file_sec) + 1);