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keys: Add keyslot access check

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This commit is contained in:
shchmue 2021-07-11 15:23:43 -06:00
parent d8ba2c8c94
commit e9568a8625
1 changed files with 16 additions and 2 deletions
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18
source/keys/keys.c
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@ -826,7 +826,21 @@ static void _save_keys_to_sd(key_derivation_ctx_t *keys, titlekey_buffer_t *titl
free(text_buffer); free(text_buffer);
} }
static bool _check_keyslot_access() {
u8 test_data[AES_128_KEY_SIZE] = {0};
const u8 test_ciphertext[AES_128_KEY_SIZE] = {0};
se_aes_key_set(8, "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f", SE_KEY_128_SIZE);
se_aes_crypt_block_ecb(8, 0, test_data, test_ciphertext);
return memcmp(test_data, "\x7b\x1d\x29\xa1\x6c\xf8\xcc\xab\x84\xf0\xb8\xa5\x98\xe4\x2f\xa6", SE_KEY_128_SIZE) == 0;
}
static void _derive_keys() { static void _derive_keys() {
if (!_check_keyslot_access()) {
EPRINTF("Unable to set crypto keyslots!\nTry launching payload differently\n or flash Spacecraft-NX if using a modchip!");
return;
}
u32 start_whole_operation_time = get_tmr_us(); u32 start_whole_operation_time = get_tmr_us();
const pkg1_id_t *pkg1_id; const pkg1_id_t *pkg1_id;
@ -948,10 +962,10 @@ static void _get_device_key(u32 ks, void *out_device_key, u32 revision, const vo
} }
u32 temp_key[AES_128_KEY_SIZE / 4] = {0}; u32 temp_key[AES_128_KEY_SIZE / 4] = {0};
se_aes_key_set(ks, new_device_key, AES_128_KEY_SIZE); se_aes_key_set(ks, new_device_key, AES_128_KEY_SIZE);
se_aes_crypt_ecb(ks, 0, temp_key, AES_128_KEY_SIZE, device_master_key_source_sources[revision], AES_128_KEY_SIZE); se_aes_crypt_block_ecb(ks, 0, temp_key, device_master_key_source_sources[revision]);
se_aes_key_set(ks, master_key, AES_128_KEY_SIZE); se_aes_key_set(ks, master_key, AES_128_KEY_SIZE);
se_aes_unwrap_key(ks, ks, device_master_kek_sources[revision]); se_aes_unwrap_key(ks, ks, device_master_kek_sources[revision]);
se_aes_crypt_ecb(ks, 0, out_device_key, AES_128_KEY_SIZE, temp_key, AES_128_KEY_SIZE); se_aes_crypt_block_ecb(ks, 0, out_device_key, temp_key);
} }
static bool _test_key_pair(const void *public_exponent, const void *private_exponent, const void *modulus) { static bool _test_key_pair(const void *public_exponent, const void *private_exponent, const void *modulus) {