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modtrezorcrypto/bip32: add HDNode.__init__

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This commit is contained in:
Jan Pochyla 2017-12-04 13:21:30 +01:00
parent 58e4a5546f
commit 314e6a99c1
1 changed files with 87 additions and 0 deletions
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87
embed/extmod/modtrezorcrypto/modtrezorcrypto-bip32.h
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@ -8,6 +8,7 @@
#include "py/objstr.h"
#include "trezor-crypto/bip32.h"
#include "trezor-crypto/curves.h"
/// class HDNode:
/// '''
@ -24,6 +25,91 @@ STATIC const mp_obj_type_t mod_trezorcrypto_HDNode_type;
#define XPUB_MAXLEN 128
#define ADDRESS_MAXLEN 36
/// def __init__(self,
/// depth: int,
/// fingerprint: int,
/// child_num: int,
/// chain_code: bytes,
/// private_key: bytes = None,
/// public_key: bytes = None,
/// curve_name: str = None) -> None:
/// '''
/// '''
STATIC mp_obj_t mod_trezorcrypto_HDNode_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
STATIC const mp_arg_t allowed_args[] = {
{ MP_QSTR_depth, MP_ARG_REQUIRED | MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_fingerprint, MP_ARG_REQUIRED | MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_child_num, MP_ARG_REQUIRED | MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_chain_code, MP_ARG_REQUIRED | MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_empty_bytes} },
{ MP_QSTR_private_key, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_empty_bytes} },
{ MP_QSTR_public_key, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_empty_bytes} },
{ MP_QSTR_curve_name, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_empty_bytes} },
};
mp_arg_val_t vals[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all_kw_array(n_args, n_kw, args, MP_ARRAY_SIZE(allowed_args), allowed_args, vals);
mp_buffer_info_t chain_code;
mp_buffer_info_t private_key;
mp_buffer_info_t public_key;
mp_buffer_info_t curve_name;
const mp_int_t depth = vals[0].u_int;
const mp_int_t fingerprint = vals[1].u_int;
const mp_int_t child_num = vals[2].u_int;
mp_get_buffer_raise(vals[3].u_obj, &chain_code, MP_BUFFER_READ);
mp_get_buffer_raise(vals[4].u_obj, &private_key, MP_BUFFER_READ);
mp_get_buffer_raise(vals[5].u_obj, &public_key, MP_BUFFER_READ);
mp_get_buffer_raise(vals[6].u_obj, &curve_name, MP_BUFFER_READ);
if (NULL == chain_code.buf || 32 != chain_code.len) {
mp_raise_ValueError("chain_code is invalid");
}
if (NULL == public_key.buf && NULL == private_key.buf) {
mp_raise_ValueError("either public_key or private_key is required");
}
if (NULL != private_key.buf && 32 != private_key.len) {
mp_raise_ValueError("private_key is invalid");
}
if (NULL != public_key.buf && 33 != public_key.len) {
mp_raise_ValueError("public_key is invalid");
}
const curve_info *curve = NULL;
if (NULL == curve_name.buf) {
curve = get_curve_by_name(SECP256K1_NAME);
} else {
curve = get_curve_by_name(curve_name.buf);
}
if (NULL == curve) {
mp_raise_ValueError("curve_name is invalid");
}
mp_obj_HDNode_t *o = m_new_obj(mp_obj_HDNode_t);
o->base.type = type;
o->fingerprint = (uint32_t)fingerprint;
o->hdnode.depth = (uint32_t)depth;
o->hdnode.child_num = (uint32_t)child_num;
if (NULL != chain_code.buf && 32 == chain_code.len) {
memcpy(o->hdnode.chain_code, chain_code.buf, 32);
} else {
memset(o->hdnode.chain_code, 0, 32);
}
if (NULL != private_key.buf && 32 == private_key.len) {
memcpy(o->hdnode.private_key, private_key.buf, 32);
} else {
memset(o->hdnode.private_key, 0, 32);
}
if (NULL != public_key.buf && 33 == public_key.len) {
memcpy(o->hdnode.public_key, public_key.buf, 33);
} else {
memset(o->hdnode.public_key, 0, 33);
}
o->hdnode.curve = curve;
return MP_OBJ_FROM_PTR(o);
}
/// def derive(self, index: int) -> None:
/// '''
/// Derive a BIP0032 child node in place.
@ -232,6 +318,7 @@ STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_HDNode_locals_dict, mod_trezorcrypt
STATIC const mp_obj_type_t mod_trezorcrypto_HDNode_type = {
{ &mp_type_type },
.name = MP_QSTR_HDNode,
.make_new = mod_trezorcrypto_HDNode_make_new,
.locals_dict = (void*)&mod_trezorcrypto_HDNode_locals_dict,
};