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Code Issues Releases Activity

keys: Add ETicket RSA keypair to keyfile

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This commit is contained in:
shchmue 2022-04-02 09:45:14 -06:00
parent 065ba8bc11
commit 85e56adbf5
2 changed files with 11 additions and 9 deletions
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19
source/keys/keys.c
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@ -453,8 +453,6 @@ static bool _derive_titlekeys(key_derivation_ctx_t *keys, titlekey_buffer_t *tit
gfx_printf("%kTitlekeys... \n", colors[(color_idx++) % 6]);
rsa_keypair_t rsa_keypair = {0};
if (!emummc_storage_read(NX_EMMC_CALIBRATION_OFFSET / NX_EMMC_BLOCKSIZE, NX_EMMC_CALIBRATION_SIZE / NX_EMMC_BLOCKSIZE, titlekey_buffer->read_buffer)) {
EPRINTF("Unable to read PRODINFO.");
return false;
@ -496,34 +494,36 @@ static bool _derive_titlekeys(key_derivation_ctx_t *keys, titlekey_buffer_t *tit
}
se_aes_key_set(6, keys->temp_key, sizeof(keys->temp_key));
se_aes_crypt_ctr(6, &rsa_keypair, sizeof(rsa_keypair), eticket_device_key, sizeof(rsa_keypair), eticket_iv);
se_aes_crypt_ctr(6, &keys->rsa_keypair, sizeof(keys->rsa_keypair), eticket_device_key, sizeof(keys->rsa_keypair), eticket_iv);
// Check public exponent is 65537 big endian
if (_read_be_u32(rsa_keypair.public_exponent, 0) != 65537) {
if (_read_be_u32(keys->rsa_keypair.public_exponent, 0) != 65537) {
// try legacy kek source
_derive_eticket_rsa_kek(keys, 7, keys->temp_key, keys->master_key[0], eticket_rsa_kek_source_legacy);
se_aes_key_set(6, keys->temp_key, sizeof(keys->temp_key));
se_aes_crypt_ctr(6, &rsa_keypair, sizeof(rsa_keypair), eticket_device_key, sizeof(rsa_keypair), eticket_iv);
se_aes_crypt_ctr(6, &keys->rsa_keypair, sizeof(keys->rsa_keypair), eticket_device_key, sizeof(keys->rsa_keypair), eticket_iv);
if (_read_be_u32(rsa_keypair.public_exponent, 0) != 65537) {
if (_read_be_u32(keys->rsa_keypair.public_exponent, 0) != 65537) {
EPRINTF("Invalid public exponent.");
memset(&keys->rsa_keypair, 0, sizeof(keys->rsa_keypair));
return false;
} else {
memcpy(keys->eticket_rsa_kek, keys->temp_key, sizeof(keys->eticket_rsa_kek));
}
}
if (!_test_key_pair(rsa_keypair.public_exponent, rsa_keypair.private_exponent, rsa_keypair.modulus)) {
if (!_test_key_pair(keys->rsa_keypair.public_exponent, keys->rsa_keypair.private_exponent, keys->rsa_keypair.modulus)) {
EPRINTF("Invalid keypair. Check eticket_rsa_kek.");
memset(&keys->rsa_keypair, 0, sizeof(keys->rsa_keypair));
return false;
}
se_rsa_key_set(0, rsa_keypair.modulus, sizeof(rsa_keypair.modulus), rsa_keypair.private_exponent, sizeof(rsa_keypair.private_exponent));
se_rsa_key_set(0, keys->rsa_keypair.modulus, sizeof(keys->rsa_keypair.modulus), keys->rsa_keypair.private_exponent, sizeof(keys->rsa_keypair.private_exponent));
const u32 buf_size = SZ_16K;
_get_titlekeys_from_save(buf_size, keys->save_mac_key, titlekey_buffer, NULL);
_get_titlekeys_from_save(buf_size, keys->save_mac_key, titlekey_buffer, &rsa_keypair);
_get_titlekeys_from_save(buf_size, keys->save_mac_key, titlekey_buffer, &keys->rsa_keypair);
gfx_printf("\n%k Found %d titlekeys.\n\n", colors[(color_idx++) % 6], _titlekey_count);
@ -704,6 +704,7 @@ static void _save_keys_to_sd(key_derivation_ctx_t *keys, titlekey_buffer_t *titl
SAVE_KEY(eticket_rsa_kek_source);
}
SAVE_KEY(eticket_rsa_kekek_source);
_save_key("eticket_rsa_keypair", &keys->rsa_keypair, sizeof(keys->rsa_keypair), text_buffer);
SAVE_KEY(header_kek_source);
SAVE_KEY_VAR(header_key, keys->header_key);
SAVE_KEY(header_key_source);

1
source/keys/keys.h
View file

@ -131,6 +131,7 @@ typedef struct {
tsec_root_key[AES_128_KEY_SIZE];
u32 sbk[4];
keyblob_t keyblob[KB_FIRMWARE_VERSION_600 + 1];
rsa_keypair_t rsa_keypair;
} key_derivation_ctx_t;
typedef struct {