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feat(core): Add key tweaking functions to trezorcrypto.bip340.

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Andrew Kozlik 2021-10-25 19:01:10 +02:00 committed by Andrew Kozlik
parent 3f5c11a919
commit 59c0f4383d
2 changed files with 105 additions and 1 deletions
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86
core/embed/extmod/modtrezorcrypto/modtrezorcrypto-bip340.h
View File

@ -141,6 +141,86 @@ STATIC mp_obj_t mod_trezorcrypt_bip340_verify(mp_obj_t public_key,
STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorcrypt_bip340_verify_obj, STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorcrypt_bip340_verify_obj,
mod_trezorcrypt_bip340_verify); mod_trezorcrypt_bip340_verify);
/// def tweak_public_key(
/// public_key: bytes,
/// root_hash: bytes | None = None,
/// ) -> bytes:
/// """
/// Tweaks the public key with the specified root_hash.
/// """
STATIC mp_obj_t mod_trezorcrypt_bip340_tweak_public_key(size_t n_args,
const mp_obj_t *args) {
mp_buffer_info_t pk = {0};
mp_get_buffer_raise(args[0], &pk, MP_BUFFER_READ);
if (pk.len != 32) {
mp_raise_ValueError("Invalid length of public key");
}
mp_buffer_info_t rh = {0};
const uint8_t *rh_ptr = NULL;
if (n_args > 1 && args[1] != mp_const_none) {
mp_get_buffer_raise(args[1], &rh, MP_BUFFER_READ);
if (rh.len != 32) {
mp_raise_ValueError("Invalid length of root hash");
}
rh_ptr = (const uint8_t *)rh.buf;
}
vstr_t tpk = {0};
vstr_init_len(&tpk, 32);
int ret = zkp_bip340_tweak_public_key((const uint8_t *)pk.buf, rh_ptr,
(uint8_t *)tpk.buf);
if (ret != 0) {
vstr_clear(&tpk);
mp_raise_ValueError("Failed to tweak public key");
}
return mp_obj_new_str_from_vstr(&mp_type_bytes, &tpk);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(
mod_trezorcrypt_bip340_tweak_public_key_obj, 1, 2,
mod_trezorcrypt_bip340_tweak_public_key);
/// def tweak_secret_key(
/// secret_key: bytes,
/// root_hash: bytes | None = None,
/// ) -> bytes:
/// """
/// Tweaks the secret key with the specified root_hash.
/// """
STATIC mp_obj_t mod_trezorcrypt_bip340_tweak_secret_key(size_t n_args,
const mp_obj_t *args) {
mp_buffer_info_t sk = {0};
mp_get_buffer_raise(args[0], &sk, MP_BUFFER_READ);
if (sk.len != 32) {
mp_raise_ValueError("Invalid length of secret key");
}
mp_buffer_info_t rh = {0};
const uint8_t *rh_ptr = NULL;
if (n_args > 1 && args[1] != mp_const_none) {
mp_get_buffer_raise(args[1], &rh, MP_BUFFER_READ);
if (rh.len != 32) {
mp_raise_ValueError("Invalid length of root hash");
}
rh_ptr = (const uint8_t *)rh.buf;
}
vstr_t tsk = {0};
vstr_init_len(&tsk, 32);
int ret = zkp_bip340_tweak_private_key((const uint8_t *)sk.buf, rh_ptr,
(uint8_t *)tsk.buf);
if (ret != 0) {
vstr_clear(&tsk);
mp_raise_ValueError("Failed to tweak secret key");
}
return mp_obj_new_str_from_vstr(&mp_type_bytes, &tsk);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(
mod_trezorcrypt_bip340_tweak_secret_key_obj, 1, 2,
mod_trezorcrypt_bip340_tweak_secret_key);
STATIC const mp_rom_map_elem_t mod_trezorcrypt_bip340_globals_table[] = { STATIC const mp_rom_map_elem_t mod_trezorcrypt_bip340_globals_table[] = {
{MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_bip340)}, {MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_bip340)},
{MP_ROM_QSTR(MP_QSTR_generate_secret), {MP_ROM_QSTR(MP_QSTR_generate_secret),
@ -149,7 +229,11 @@ STATIC const mp_rom_map_elem_t mod_trezorcrypt_bip340_globals_table[] = {
MP_ROM_PTR(&mod_trezorcrypt_bip340_publickey_obj)}, MP_ROM_PTR(&mod_trezorcrypt_bip340_publickey_obj)},
{MP_ROM_QSTR(MP_QSTR_sign), MP_ROM_PTR(&mod_trezorcrypt_bip340_sign_obj)}, {MP_ROM_QSTR(MP_QSTR_sign), MP_ROM_PTR(&mod_trezorcrypt_bip340_sign_obj)},
{MP_ROM_QSTR(MP_QSTR_verify), {MP_ROM_QSTR(MP_QSTR_verify),
MP_ROM_PTR(&mod_trezorcrypt_bip340_verify_obj)}}; MP_ROM_PTR(&mod_trezorcrypt_bip340_verify_obj)},
{MP_ROM_QSTR(MP_QSTR_tweak_public_key),
MP_ROM_PTR(&mod_trezorcrypt_bip340_tweak_public_key_obj)},
{MP_ROM_QSTR(MP_QSTR_tweak_secret_key),
MP_ROM_PTR(&mod_trezorcrypt_bip340_tweak_secret_key_obj)}};
STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypt_bip340_globals, STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypt_bip340_globals,
mod_trezorcrypt_bip340_globals_table); mod_trezorcrypt_bip340_globals_table);

20
core/mocks/generated/trezorcrypto/bip340.pyi
View File

@ -31,3 +31,23 @@ def verify(public_key: bytes, signature: bytes, digest: bytes) -> bool:
Uses public key to verify the signature of the digest. Uses public key to verify the signature of the digest.
Returns True on success. Returns True on success.
""" """
# extmod/modtrezorcrypto/modtrezorcrypto-bip340.h
def tweak_public_key(
public_key: bytes,
root_hash: bytes | None = None,
) -> bytes:
"""
Tweaks the public key with the specified root_hash.
"""
# extmod/modtrezorcrypto/modtrezorcrypto-bip340.h
def tweak_secret_key(
secret_key: bytes,
root_hash: bytes | None = None,
) -> bytes:
"""
Tweaks the secret key with the specified root_hash.
"""