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refacor(crypto): refactor hdnode_public_ckd

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This commit is contained in:
Ondřej Vejpustek 2024-08-15 11:57:36 +02:00
parent dd6d48aff3
commit c8b811bac5
2 changed files with 32 additions and 64 deletions
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89
crypto/bip32.c
View File

@ -281,52 +281,7 @@ int hdnode_private_ckd(HDNode *inout, uint32_t i) {
}
}
int hdnode_public_ckd_cp(const ecdsa_curve *curve, const curve_point *parent,
const uint8_t *parent_chain_code, uint32_t i,
curve_point *child, uint8_t *child_chain_code) {
uint8_t data[(1 + 32) + 4] = {0};
uint8_t I[32 + 32] = {0};
bignum256 c = {0};
if (i & 0x80000000) { // private derivation
return 0;
}
data[0] = 0x02 | (parent->y.val[0] & 0x01);
bn_write_be(&parent->x, data + 1);
write_be(data + 33, i);
while (true) {
hmac_sha512(parent_chain_code, 32, data, sizeof(data), I);
bn_read_be(I, &c);
if (bn_is_less(&c, &curve->order)) { // < order
// b = c * G
uint8_t child_pubkey[65] = {0};
ecdsa_get_public_key65(curve, I, child_pubkey);
ecdsa_read_pubkey(curve, child_pubkey, child);
point_add(curve, parent, child); // b = a + b
if (!point_is_infinity(child)) {
if (child_chain_code) {
memcpy(child_chain_code, I + 32, 32);
}
// Wipe all stack data.
memzero(data, sizeof(data));
memzero(I, sizeof(I));
memzero(&c, sizeof(c));
return 1;
}
}
data[0] = 1;
memcpy(data + 1, I + 32, 32);
}
}
int hdnode_public_ckd(HDNode *inout, uint32_t i) {
curve_point parent = {0}, child = {0};
if (!inout->curve->params) {
// SLIP-10 doesn't support public key to public key derivation for
// curve25519 and ed25519, Cardano BIP32-ed22519 public key to public key
@ -334,25 +289,43 @@ int hdnode_public_ckd(HDNode *inout, uint32_t i) {
return 0;
}
if (!ecdsa_read_pubkey(inout->curve->params, inout->public_key, &parent)) {
uint8_t data[33 + 4] = {0};
uint8_t digest[32 + 32] = {0};
int result = 0;
if (i & 0x80000000) { // private derivation
return 0;
}
if (!hdnode_public_ckd_cp(inout->curve->params, &parent, inout->chain_code, i,
&child, inout->chain_code)) {
return 0;
}
memzero(inout->private_key, 32);
memcpy(data, inout->public_key, 33);
write_be(data + 33, i);
while (true) {
hmac_sha512(inout->chain_code, 32, data, sizeof(data), digest);
result = ecdsa_tweak_pubkey(inout->curve->params, inout->public_key, digest,
inout->public_key);
if (result == ECDSA_TWEAK_PUBKEY_SUCCESS) {
memcpy(inout->chain_code, digest + 32, 32);
inout->depth++;
inout->child_num = i;
inout->public_key[0] = 0x02 | (child.y.val[0] & 0x01);
bn_write_be(&child.x, inout->public_key + 1);
inout->is_public_key_set = true;
memzero(inout->private_key, 32);
break;
}
if (result != ECDSA_TWEAK_PUBKEY_INVALID_TWEAK_OR_RESULT_ERR) {
break;
}
// Wipe all stack data.
memzero(&parent, sizeof(parent));
memzero(&child, sizeof(child));
// The tweak is less than the order of the curve or the tweaked public key
// is the point at infinity
data[0] = 1;
memcpy(data + 1, digest + 32, 32);
}
return 1;
memzero(digest, sizeof(digest));
memzero(data, sizeof(data));
return result == ECDSA_TWEAK_PUBKEY_SUCCESS;
}
#if USE_BIP32_CACHE

5
crypto/bip32.h
View File

@ -75,11 +75,6 @@ int hdnode_from_seed(const uint8_t *seed, int seed_len, const char *curve,
hdnode_private_ckd((X), ((I) | 0x80000000))
int hdnode_private_ckd(HDNode *inout, uint32_t i);
int hdnode_public_ckd_cp(const ecdsa_curve *curve, const curve_point *parent,
const uint8_t *parent_chain_code, uint32_t i,
curve_point *child, uint8_t *child_chain_code);
int hdnode_public_ckd(HDNode *inout, uint32_t i);
#if USE_BIP32_CACHE