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Code Issues Releases Activity

Simplify some logic in derive_nx_keydata

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This commit is contained in:
TuxSH 2018-05-16 18:41:16 +02:00
parent c0617982b8
commit ab4518b9c1
1 changed files with 9 additions and 19 deletions
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28
fusee/fusee-secondary/src/key_derivation.c
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@ -64,16 +64,17 @@ static bool safe_memcmp(uint8_t *a, uint8_t *b, size_t sz) {
} }
static int decrypt_keyblob(const nx_keyblob_t *keyblobs, uint32_t revision, uint32_t available_revision) { static int decrypt_keyblob(const nx_keyblob_t *keyblobs, uint32_t revision, uint32_t available_revision) {
nx_keyblob_t keyblob; nx_keyblob_t __attribute__((aligned(16))) keyblob;
uint8_t work_buffer[0x10]; uint8_t __attribute__((aligned(16))) work_buffer[0x10];
unsigned int keyslot = revision == MASTERKEY_REVISION_100_230 ? 0xF : KEYSLOT_SWITCH_TEMPKEY;
if (get_keyblob(&keyblob, revision, keyblobs, available_revision) != 0) { if (get_keyblob(&keyblob, revision, keyblobs, available_revision) != 0) {
return -1; return -1;
} }
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[revision], 0x10); se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[revision], 0x10);
decrypt_data_into_keyslot(KEYSLOT_SWITCH_TEMPKEY, 0xE, work_buffer, 0x10); decrypt_data_into_keyslot(keyslot, 0xE, work_buffer, 0x10);
decrypt_data_into_keyslot(0xB, KEYSLOT_SWITCH_TEMPKEY, keyblob_mac_seed, 0x10); decrypt_data_into_keyslot(0xB, keyslot, keyblob_mac_seed, 0x10);
/* Validate keyblob. */ /* Validate keyblob. */
se_compute_aes_128_cmac(0xB, work_buffer, 0x10, keyblob.mac + sizeof(keyblob.mac), sizeof(keyblob) - sizeof(keyblob.mac)); se_compute_aes_128_cmac(0xB, work_buffer, 0x10, keyblob.mac + sizeof(keyblob.mac), sizeof(keyblob) - sizeof(keyblob.mac));
@ -97,8 +98,7 @@ int load_package1_key(uint32_t revision) {
/* Derive all Switch keys. */ /* Derive all Switch keys. */
int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, uint32_t available_revision, const void *tsec_fw, size_t tsec_fw_size) { int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, uint32_t available_revision, const void *tsec_fw, size_t tsec_fw_size) {
uint8_t work_buffer[0x10]; uint8_t __attribute__((aligned(16))) work_buffer[0x10];
nx_dec_keyblob_t dec_keyblob;
/* TODO: Set keyslot flags properly in preparation of derivation. */ /* TODO: Set keyslot flags properly in preparation of derivation. */
set_aes_keyslot_flags(0xE, 0x15); set_aes_keyslot_flags(0xE, 0x15);
@ -110,7 +110,7 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
} }
set_aes_keyslot(0xD, work_buffer, 0x10); set_aes_keyslot(0xD, work_buffer, 0x10);
/* Decrypt all keyblobs. */ /* Decrypt all keyblobs, setting keyslot 0xF correctly. */
for (unsigned int rev = 0; rev < MASTERKEY_REVISION_MAX; rev++) { for (unsigned int rev = 0; rev < MASTERKEY_REVISION_MAX; rev++) {
int ret = decrypt_keyblob(keyblobs, rev, available_revision); int ret = decrypt_keyblob(keyblobs, rev, available_revision);
if (ret) { if (ret) {
@ -118,21 +118,11 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
} }
} }
/* Always try to set up the highest possible master key. */
/* Derive both keyblob key 1, and keyblob key latest. */
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[MASTERKEY_REVISION_100_230], 0x10);
decrypt_data_into_keyslot(0xF, 0xE, work_buffer, 0x10);
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[MASTERKEY_REVISION_500_CURRENT], 0x10);
decrypt_data_into_keyslot(0xD, 0xE, work_buffer, 0x10);
/* Clear the SBK. */ /* Clear the SBK. */
clear_aes_keyslot(0xE); clear_aes_keyslot(0xE);
/* Get latest keyblob. */
dec_keyblob = g_dec_keyblobs[MASTERKEY_REVISION_500_CURRENT];
/* Get needed data. */ /* Get needed data. */
set_aes_keyslot(0xC, dec_keyblob.keys[0], 0x10); set_aes_keyslot(0xC, g_dec_keyblobs[MASTERKEY_REVISION_500_CURRENT].keys[0], 0x10);
/* Derive keys for Exosphere, lock critical keyslots. */ /* Derive keys for Exosphere, lock critical keyslots. */
switch (target_firmware) { switch (target_firmware) {