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fusee: always use the exo2 (modern tz) key layout

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Michael Scire 2020-06-11 22:30:20 -07:00 committed by SciresM
parent 6780b096ca
commit 47512cc8a2
1 changed files with 11 additions and 36 deletions
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43
fusee/fusee-secondary/src/key_derivation.c
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@ -161,8 +161,8 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
void *tsec_root_key = (void *)((uintptr_t)tsec_root_keys + 0x10 * (rev - MASTERKEY_REVISION_620));
if (memcmp(tsec_root_key, zeroes, 0x10) != 0) {
/* We got a valid key from emulation. */
set_aes_keyslot(0xC, tsec_root_key, 0x10);
se_aes_ecb_decrypt_block(0xC, work_buffer, 0x10, new_master_kek_seeds[rev - MASTERKEY_REVISION_620], 0x10);
set_aes_keyslot(0xD, tsec_root_key, 0x10);
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, new_master_kek_seeds[rev - MASTERKEY_REVISION_620], 0x10);
memcpy(g_dec_keyblobs[rev].master_kek, work_buffer, 0x10);
}
}
@ -179,8 +179,8 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
fclose(extkey_file);
for (unsigned int rev = MASTERKEY_REVISION_620; rev < MASTERKEY_REVISION_MAX; rev++) {
if (memcmp(extkeys.tsec_root_keys[rev - MASTERKEY_REVISION_620], zeroes, 0x10) != 0) {
set_aes_keyslot(0xC, extkeys.tsec_root_keys[rev - MASTERKEY_REVISION_620], 0x10);
se_aes_ecb_decrypt_block(0xC, work_buffer, 0x10, new_master_kek_seeds[rev - MASTERKEY_REVISION_620], 0x10);
set_aes_keyslot(0xD, extkeys.tsec_root_keys[rev - MASTERKEY_REVISION_620], 0x10);
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, new_master_kek_seeds[rev - MASTERKEY_REVISION_620], 0x10);
memcpy(g_dec_keyblobs[rev].master_kek, work_buffer, 0x10);
} else {
memcpy(g_dec_keyblobs[rev].master_kek, extkeys.master_keks[rev], 0x10);
@ -198,7 +198,7 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
clear_aes_keyslot(0xE);
/* Get needed data. */
set_aes_keyslot(0xC, g_dec_keyblobs[available_revision].master_kek, 0x10);
set_aes_keyslot(0xD, g_dec_keyblobs[available_revision].master_kek, 0x10);
/* Also set the Package1 key for the revision that is stored on the eMMC boot0 partition. */
if (target_firmware < ATMOSPHERE_TARGET_FIRMWARE_6_2_0) {
@ -206,42 +206,17 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
}
/* Derive keys for Exosphere, lock critical keyslots. */
switch (target_firmware) {
case ATMOSPHERE_TARGET_FIRMWARE_1_0_0:
case ATMOSPHERE_TARGET_FIRMWARE_2_0_0:
case ATMOSPHERE_TARGET_FIRMWARE_3_0_0:
decrypt_data_into_keyslot(0xD, 0xF, devicekey_seed, 0x10);
decrypt_data_into_keyslot(0xC, 0xC, masterkey_seed, 0x10);
break;
case ATMOSPHERE_TARGET_FIRMWARE_4_0_0:
decrypt_data_into_keyslot(0xD, 0xF, devicekey_4x_seed, 0x10);
decrypt_data_into_keyslot(0xF, 0xF, devicekey_seed, 0x10);
decrypt_data_into_keyslot(0xE, 0xC, masterkey_4x_seed, 0x10);
decrypt_data_into_keyslot(0xC, 0xC, masterkey_seed, 0x10);
break;
case ATMOSPHERE_TARGET_FIRMWARE_5_0_0:
case ATMOSPHERE_TARGET_FIRMWARE_6_0_0:
case ATMOSPHERE_TARGET_FIRMWARE_6_2_0:
case ATMOSPHERE_TARGET_FIRMWARE_7_0_0:
case ATMOSPHERE_TARGET_FIRMWARE_8_0_0:
case ATMOSPHERE_TARGET_FIRMWARE_8_1_0:
case ATMOSPHERE_TARGET_FIRMWARE_9_0_0:
decrypt_data_into_keyslot(0xA, 0xF, devicekey_4x_seed, 0x10);
decrypt_data_into_keyslot(0xF, 0xF, devicekey_seed, 0x10);
decrypt_data_into_keyslot(0xD, 0xC, masterkey_seed, 0x10);
decrypt_data_into_keyslot(0xC, 0xC, masterkey_4x_seed, 0x10);
break;
default:
return -1;
}
decrypt_data_into_keyslot(0xC, 0xD, masterkey_4x_seed, 0x10);
decrypt_data_into_keyslot(0xD, 0xD, masterkey_seed, 0x10);
/* Setup master key revision, derive older master keys for use. */
return mkey_detect_revision(fuse_get_retail_type() != 0);
}
static void generate_specific_aes_key(void *dst, const void *wrapped_key, bool should_mask, uint32_t target_firmware, uint32_t generation) {
unsigned int keyslot = (target_firmware >= ATMOSPHERE_TARGET_FIRMWARE_4_0_0) ? (devkey_get_keyslot(generation)) : (KEYSLOT_SWITCH_DEVICEKEY);
unsigned int keyslot = devkey_get_keyslot(generation);
if (fuse_get_bootrom_patch_version() < 0x7F) {
/* On dev units, use a fixed "all-zeroes" seed. */
@ -273,7 +248,7 @@ static void generate_personalized_aes_key_for_bis(void *dst, const void *wrapped
0x89, 0x61, 0x5E, 0xE0, 0x5C, 0x31, 0xB6, 0x80, 0x5F, 0xE5, 0x8F, 0x3D, 0xA2, 0x4F, 0x7A, 0xA8
};
unsigned int keyslot = (target_firmware >= ATMOSPHERE_TARGET_FIRMWARE_4_0_0) ? (devkey_get_keyslot(generation)) : (KEYSLOT_SWITCH_DEVICEKEY);
unsigned int keyslot = devkey_get_keyslot(generation);
/* Derive kek. */
decrypt_data_into_keyslot(KEYSLOT_SWITCH_TEMPKEY, keyslot, kek_source, 0x10);
decrypt_data_into_keyslot(KEYSLOT_SWITCH_TEMPKEY, KEYSLOT_SWITCH_TEMPKEY, wrapped_kek, 0x10);