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embed: hdnode public derivation

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This commit is contained in:
Tomas Susanka 2018-01-26 13:53:32 +01:00 committed by Jan Pochyla
parent 858f2583a5
commit 368ba963a6
1 changed files with 20 additions and 6 deletions
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26
embed/extmod/modtrezorcrypto/modtrezorcrypto-bip32.h
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@ -31,6 +31,7 @@ typedef struct _mp_obj_HDNode_t {
mp_obj_base_t base;
uint32_t fingerprint;
HDNode hdnode;
bool private_key_set;
} mp_obj_HDNode_t;
STATIC const mp_obj_type_t mod_trezorcrypto_HDNode_type;
@ -110,8 +111,10 @@ STATIC mp_obj_t mod_trezorcrypto_HDNode_make_new(const mp_obj_type_t *type, size
}
if (32 == private_key.len) {
memcpy(o->hdnode.private_key, private_key.buf, 32);
o->private_key_set = true;
} else {
memzero(o->hdnode.private_key, 32);
o->private_key_set = false;
}
if (33 == public_key.len) {
memcpy(o->hdnode.public_key, public_key.buf, 33);
@ -123,16 +126,27 @@ STATIC mp_obj_t mod_trezorcrypto_HDNode_make_new(const mp_obj_type_t *type, size
return MP_OBJ_FROM_PTR(o);
}
/// def derive(self, index: int) -> None:
/// def derive(self, index: int, public: bool=False) -> None:
/// '''
/// Derive a BIP0032 child node in place.
/// '''
STATIC mp_obj_t mod_trezorcrypto_HDNode_derive(mp_obj_t self, mp_obj_t index) {
mp_obj_HDNode_t *o = MP_OBJ_TO_PTR(self);
uint32_t i = mp_obj_get_int_truncated(index);
STATIC mp_obj_t mod_trezorcrypto_HDNode_derive(size_t n_args, const mp_obj_t *args) {
mp_obj_HDNode_t *o = MP_OBJ_TO_PTR(args[0]);
uint32_t i = mp_obj_get_int_truncated(args[1]);
uint32_t fp = hdnode_fingerprint(&o->hdnode);
bool public = n_args > 2 && args[2] == mp_const_true;
if (!hdnode_private_ckd(&o->hdnode, i)) {
int res;
if (public) {
res = hdnode_public_ckd(&o->hdnode, i);
} else {
if (!o->private_key_set) {
memzero(&o->hdnode, sizeof(o->hdnode));
mp_raise_ValueError("Failed to derive, private key not set");
}
res = hdnode_private_ckd(&o->hdnode, i);
}
if (!res) {
memzero(&o->hdnode, sizeof(o->hdnode));
mp_raise_ValueError("Failed to derive");
}
@ -140,7 +154,7 @@ STATIC mp_obj_t mod_trezorcrypto_HDNode_derive(mp_obj_t self, mp_obj_t index) {
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_HDNode_derive_obj, mod_trezorcrypto_HDNode_derive);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorcrypto_HDNode_derive_obj, 2, 3, mod_trezorcrypto_HDNode_derive);
/// def derive_path(self, path: List[int]) -> None:
/// '''