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modtrezorcrypto: use cached bip32 path derivation

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This commit is contained in:
Jan Pochyla 2016-12-12 15:18:17 +01:00
parent 1de4cf4a18
commit 47994e35f4
1 changed files with 17 additions and 17 deletions
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26
extmod/modtrezorcrypto/modtrezorcrypto-bip32.h
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@ -45,31 +45,31 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_HDNode_derive_obj, mod_TrezorC
/// '''
STATIC mp_obj_t mod_TrezorCrypto_HDNode_derive_path(mp_obj_t self, mp_obj_t path) {
mp_obj_HDNode_t *o = MP_OBJ_TO_PTR(self);
// get path objects and length
mp_uint_t plen;
mp_obj_t *pitems;
mp_obj_get_array(path, &plen, &pitems);
if (plen > 32) {
mp_raise_ValueError("Path cannot be longer than 32 indexes");
}
for (uint32_t pi = 0; pi < plen; pi++) {
mp_obj_t iobj = pitems[pi];
if (!MP_OBJ_IS_INT(iobj)) {
// some value from the path is not integer, reset the state and raise
o->fingerprint = 0;
memset(&o->hdnode, 0, sizeof(o->hdnode));
// convert path to int array
uint32_t pi;
uint32_t pints[plen];
for (pi = 0; pi < plen; pi++) {
if (!MP_OBJ_IS_INT(pitems[pi])) {
mp_raise_TypeError("Index has to be int");
}
uint32_t i = mp_obj_get_int_truncated(iobj);
if (pi == plen - 1) {
// compute fingerprint before overwriting the node, but only for the nth-1 node
o->fingerprint = hdnode_fingerprint(&o->hdnode);
pints[pi] = mp_obj_get_int_truncated(pitems[pi]);
}
if (!hdnode_private_ckd(&o->hdnode, i)) {
if (!hdnode_private_ckd_cached(&o->hdnode, pints, plen, &o->fingerprint)) {
// derivation failed, reset the state and raise
o->fingerprint = 0;
memset(&o->hdnode, 0, sizeof(o->hdnode));
mp_raise_ValueError("Failed to derive path");
}
}
return mp_const_none;
}