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Code Issues Releases Activity

Always derive latest master key on mariko hw

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This commit is contained in:
shchmue 2021-07-11 12:58:43 -06:00
parent b62b42e304
commit db453b961b
1 changed files with 6 additions and 6 deletions
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12
source/keys/keys.c
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@ -224,12 +224,12 @@ static bool _derive_tsec_keys(tsec_ctxt_t *tsec_ctxt, u32 kb, key_derivation_ctx
return true;
}
static void _derive_master_key_mariko(u32 kb, key_derivation_ctx_t *keys) {
static void _derive_master_key_mariko(key_derivation_ctx_t *keys) {
// Relies on the SBK being properly set in slot 14
se_aes_crypt_block_ecb(14, 0, keys->device_key_4x, device_master_key_source_kek_source);
// Relies on the Mariko KEK being properly set in slot 12
se_aes_unwrap_key(8, 12, &mariko_master_kek_sources[kb - KB_FIRMWARE_VERSION_600]);
se_aes_crypt_block_ecb(8, 0, keys->master_key[kb], master_key_source);
se_aes_unwrap_key(8, 12, &mariko_master_kek_sources[KB_FIRMWARE_VERSION_MAX - KB_FIRMWARE_VERSION_600]);
se_aes_crypt_block_ecb(8, 0, keys->master_key[KB_FIRMWARE_VERSION_MAX], master_key_source);
}
static void _derive_master_keys_post_620(u32 pkg1_kb, key_derivation_ctx_t *keys) {
@ -301,7 +301,7 @@ static void _derive_master_keys_from_keyblobs(key_derivation_ctx_t *keys) {
// verify keyblob is not corrupt
se_aes_key_set(10, keys->keyblob_mac_key[i], sizeof(keys->keyblob_mac_key[i]));
se_aes_cmac(10, keyblob_mac, sizeof(keyblob_mac), current_keyblob->iv, sizeof(current_keyblob->iv) + sizeof(keyblob_t));
if (memcmp(current_keyblob, keyblob_mac, sizeof(keyblob_mac)) != 0) {
if (memcmp(current_keyblob->cmac, keyblob_mac, sizeof(keyblob_mac)) != 0) {
EPRINTFARGS("Keyblob %x corrupt.", i);
continue;
}
@ -851,8 +851,8 @@ static void _derive_keys() {
// Master key derivation
if (h_cfg.t210b01) {
_derive_master_key_mariko(pkg1_id->kb, &keys);
_derive_master_keys_post_620(pkg1_id->kb, &keys);
_derive_master_key_mariko(&keys);
_derive_master_keys_post_620(KB_FIRMWARE_VERSION_MAX, &keys);
} else {
_derive_master_keys_post_620(pkg1_id->kb, &keys);
_derive_master_keys_from_keyblobs(&keys);