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modtrezorcrypto: add bip32 deserialization

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This commit is contained in:
Jan Pochyla 2016-10-14 15:11:35 +02:00
parent 27126396bd
commit cd9fca42b7
1 changed files with 50 additions and 13 deletions
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63
extmod/modtrezorcrypto/modtrezorcrypto-bip32.h
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@ -70,37 +70,44 @@ STATIC mp_obj_t mod_TrezorCrypto_HDNode_derive_path(mp_obj_t self, mp_obj_t path
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_HDNode_derive_path_obj, mod_TrezorCrypto_HDNode_derive_path);
STATIC mp_obj_t serialize_public_private(mp_obj_t self, mp_obj_t version, bool use_public) {
STATIC mp_obj_t serialize_public_private(mp_obj_t self, bool use_public) {
mp_obj_HDNode_t *o = MP_OBJ_TO_PTR(self);
uint32_t ver = mp_obj_get_int_truncated(version);
vstr_t vstr;
vstr_init(&vstr, 120); // maximum length of base58-serialized node
hdnode_fill_public_key(&o->hdnode);
int written = hdnode_serialize(&o->hdnode, o->fingerprint, ver, use_public, vstr.buf, vstr.alloc);
int written;
if (use_public) {
hdnode_fill_public_key(&o->hdnode);
written = hdnode_serialize_public(&o->hdnode, o->fingerprint, vstr.buf, vstr.alloc);
} else {
written = hdnode_serialize_private(&o->hdnode, o->fingerprint, vstr.buf, vstr.alloc);
}
if (written <= 0) {
mp_raise_ValueError("Failed to serialize");
}
vstr.len = written - 1; // written includes 0 at the end
return mp_obj_new_str_from_vstr(&mp_type_str, &vstr);
}
/// def trezor.crypto.HDNode.serialize_public(version: int) -> str:
/// def trezor.crypto.HDNode.serialize_public() -> str:
/// '''
/// Serialize the public info from HD node to base58 string.
/// '''
STATIC mp_obj_t mod_TrezorCrypto_HDNode_serialize_public(mp_obj_t self, mp_obj_t version) {
return serialize_public_private(self, version, true);
STATIC mp_obj_t mod_TrezorCrypto_HDNode_serialize_public(mp_obj_t self) {
return serialize_public_private(self, true);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_HDNode_serialize_public_obj, mod_TrezorCrypto_HDNode_serialize_public);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_TrezorCrypto_HDNode_serialize_public_obj, mod_TrezorCrypto_HDNode_serialize_public);
/// def trezor.crypto.HDNode.serialize_private(version: int) -> str:
/// def trezor.crypto.HDNode.serialize_private() -> str:
/// '''
/// Serialize the private info HD node to base58 string.
/// '''
STATIC mp_obj_t mod_TrezorCrypto_HDNode_serialize_private(mp_obj_t self, mp_obj_t version) {
return serialize_public_private(self, version, false);
STATIC mp_obj_t mod_TrezorCrypto_HDNode_serialize_private(mp_obj_t self) {
return serialize_public_private(self, false);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_HDNode_serialize_private_obj, mod_TrezorCrypto_HDNode_serialize_private);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_TrezorCrypto_HDNode_serialize_private_obj, mod_TrezorCrypto_HDNode_serialize_private);
/// def trezor.crypto.HDNode.depth() -> int:
/// '''
@ -195,6 +202,35 @@ STATIC mp_obj_t mod_TrezorCrypto_Bip32_make_new(const mp_obj_type_t *type, size_
return MP_OBJ_FROM_PTR(o);
}
/// def trezor.crypto.bip32.deserialize(value: str) -> HDNode:
/// '''
/// Construct a BIP0032 HD node from a base58-serialized value.
/// '''
STATIC mp_obj_t mod_TrezorCrypto_Bip32_deserialize(mp_obj_t self, mp_obj_t value) {
mp_buffer_info_t valueb;
mp_get_buffer_raise(value, &valueb, MP_BUFFER_READ);
if (valueb.len == 0) {
mp_raise_ValueError("Invalid value");
}
vstr_t vstr;
vstr_init_len(&vstr, valueb.len);
memcpy(vstr.buf, valueb.buf, valueb.len);
char *str = vstr_null_terminated_str(&vstr);
HDNode hdnode;
uint32_t fingerprint;
if (hdnode_deserialize(str, &hdnode, &fingerprint) < 0) {
mp_raise_ValueError("Failed to deserialize");
}
mp_obj_HDNode_t *o = m_new_obj(mp_obj_HDNode_t);
o->base.type = &mod_TrezorCrypto_HDNode_type;
o->hdnode = hdnode;
o->fingerprint = fingerprint;
return MP_OBJ_FROM_PTR(o);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_Bip32_deserialize_obj, mod_TrezorCrypto_Bip32_deserialize);
/// def trezor.crypto.bip32.from_seed(seed: bytes, curve_name: str) -> HDNode:
/// '''
/// Construct a BIP0032 HD node from a BIP0039 seed value.
@ -212,7 +248,7 @@ STATIC mp_obj_t mod_TrezorCrypto_Bip32_from_seed(mp_obj_t self, mp_obj_t seed, m
}
HDNode hdnode;
if (!hdnode_from_seed(seedb.buf, seedb.len, curveb.buf, &hdnode)) {
mp_raise_ValueError("Invalid seed");
mp_raise_ValueError("Failed to derive the root node");
}
mp_obj_HDNode_t *o = m_new_obj(mp_obj_HDNode_t);
o->base.type = &mod_TrezorCrypto_HDNode_type;
@ -222,6 +258,7 @@ STATIC mp_obj_t mod_TrezorCrypto_Bip32_from_seed(mp_obj_t self, mp_obj_t seed, m
STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_TrezorCrypto_Bip32_from_seed_obj, mod_TrezorCrypto_Bip32_from_seed);
STATIC const mp_rom_map_elem_t mod_TrezorCrypto_Bip32_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_deserialize), MP_ROM_PTR(&mod_TrezorCrypto_Bip32_deserialize_obj) },
{ MP_ROM_QSTR(MP_QSTR_from_seed), MP_ROM_PTR(&mod_TrezorCrypto_Bip32_from_seed_obj) },
};
STATIC MP_DEFINE_CONST_DICT(mod_TrezorCrypto_Bip32_locals_dict, mod_TrezorCrypto_Bip32_locals_dict_table);