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sept-s: First functional version.

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This commit is contained in:
Michael Scire
2019-02-20 13:12:15 -08:00
parent f1068d6c3f
commit ddc5222208
12 changed files with 72 additions and 87 deletions
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15
sept/sept-secondary/src/key_derivation.c
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@@ -48,7 +48,6 @@ static const uint8_t AL16 new_master_kek_seed_7x[0x10] = {
void derive_7x_keys(const void *tsec_key, void *tsec_root_key) {
uint8_t AL16 work_buffer[0x10];
uint8_t AL16 master_kek[0x10];
/* Set keyslot flags properly in preparation of derivation. */
set_aes_keyslot_flags(0xE, 0x15);
@@ -61,15 +60,12 @@ void derive_7x_keys(const void *tsec_key, void *tsec_root_key) {
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seed_00, 0x10);
decrypt_data_into_keyslot(0xF, 0xE, work_buffer, 0x10);
/* Derive the master kek. */
set_aes_keyslot(0xC, tsec_root_key, 0x10);
se_aes_ecb_decrypt_block(0xC, master_kek, 0x10, new_master_kek_seed_7x, 0x10);
/* Clear the SBK. */
clear_aes_keyslot(0xE);
/* Set master kek. */
set_aes_keyslot(0xC, master_kek, 0x10);
/* Derive the master kek. */
set_aes_keyslot(0xC, tsec_root_key, 0x10);
decrypt_data_into_keyslot(0xC, 0xC, new_master_kek_seed_7x, 0x10);
/* Derive keys for exosphere. */
decrypt_data_into_keyslot(0xA, 0xF, devicekey_4x_seed, 0x10);
@@ -78,8 +74,7 @@ void derive_7x_keys(const void *tsec_key, void *tsec_root_key) {
decrypt_data_into_keyslot(0xC, 0xC, masterkey_seed, 0x10);
/* Clear master kek from memory. */
for (size_t i = 0; i < sizeof(master_kek); i++) {
master_kek[i] = 0xCC;
for (size_t i = 0; i < sizeof(work_buffer); i++) {
work_buffer[i] = 0xCC;
}
}