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trezor-firmware/bip32.c
2016-05-12 19:29:24 +02:00

480 lines
13 KiB
C

/**
* Copyright (c) 2013-2016 Tomas Dzetkulic
* Copyright (c) 2013-2016 Pavol Rusnak
* Copyright (c) 2015-2016 Jochen Hoenicke
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include <stdbool.h>
#include "bignum.h"
#include "hmac.h"
#include "ecdsa.h"
#include "bip32.h"
#include "sha2.h"
#include "ripemd160.h"
#include "base58.h"
#include "macros.h"
#include "curves.h"
#include "secp256k1.h"
#include "nist256p1.h"
#include "ed25519.h"
const curve_info ed25519_info = {
/* bip32_name */
"ed25519 seed",
0
};
int hdnode_from_xpub(uint32_t depth, uint32_t fingerprint, uint32_t child_num, const uint8_t *chain_code, const uint8_t *public_key, const char* curve, HDNode *out)
{
const curve_info *info = get_curve_by_name(curve);
if (info == 0) {
return 0;
}
if (public_key[0] != 0x02 && public_key[0] != 0x03) { // invalid pubkey
return 0;
}
out->curve = info;
out->depth = depth;
out->fingerprint = fingerprint;
out->child_num = child_num;
memcpy(out->chain_code, chain_code, 32);
MEMSET_BZERO(out->private_key, 32);
memcpy(out->public_key, public_key, 33);
return 1;
}
int hdnode_from_xprv(uint32_t depth, uint32_t fingerprint, uint32_t child_num, const uint8_t *chain_code, const uint8_t *private_key, const char* curve, HDNode *out)
{
bool failed = false;
const curve_info *info = get_curve_by_name(curve);
if (info == 0) {
failed = true;
} else {
bignum256 a;
bn_read_be(private_key, &a);
if (bn_is_zero(&a)) { // == 0
failed = true;
} else {
if (!bn_is_less(&a, &info->params->order)) { // >= order
failed = true;
}
}
MEMSET_BZERO(&a, sizeof(a));
}
if (failed) {
return 0;
}
out->curve = info;
out->depth = depth;
out->fingerprint = fingerprint;
out->child_num = child_num;
memcpy(out->chain_code, chain_code, 32);
memcpy(out->private_key, private_key, 32);
hdnode_fill_public_key(out);
return 1;
}
int hdnode_from_seed(const uint8_t *seed, int seed_len, const char* curve, HDNode *out)
{
uint8_t I[32 + 32];
memset(out, 0, sizeof(HDNode));
out->depth = 0;
out->fingerprint = 0x00000000;
out->child_num = 0;
out->curve = get_curve_by_name(curve);
if (out->curve == 0) {
return 0;
}
hmac_sha512((const uint8_t*) out->curve->bip32_name,
strlen(out->curve->bip32_name), seed, seed_len, I);
if (out->curve->params) {
bignum256 a;
while (true) {
bn_read_be(I, &a);
if (!bn_is_zero(&a) // != 0
&& bn_is_less(&a, &out->curve->params->order)) { // < order
break;
}
hmac_sha512((const uint8_t*) out->curve->bip32_name,
strlen(out->curve->bip32_name), I, sizeof(I), I);
}
MEMSET_BZERO(&a, sizeof(a));
}
memcpy(out->private_key, I, 32);
memcpy(out->chain_code, I + 32, 32);
hdnode_fill_public_key(out);
MEMSET_BZERO(I, sizeof(I));
return 1;
}
int hdnode_private_ckd(HDNode *inout, uint32_t i)
{
uint8_t data[1 + 32 + 4];
uint8_t I[32 + 32];
uint8_t fingerprint[32];
bignum256 a, b;
if (i & 0x80000000) { // private derivation
data[0] = 0;
memcpy(data + 1, inout->private_key, 32);
} else { // public derivation
if (!inout->curve->params) {
return 0;
}
memcpy(data, inout->public_key, 33);
}
write_be(data + 33, i);
sha256_Raw(inout->public_key, 33, fingerprint);
ripemd160(fingerprint, 32, fingerprint);
inout->fingerprint = (fingerprint[0] << 24) + (fingerprint[1] << 16) + (fingerprint[2] << 8) + fingerprint[3];
bn_read_be(inout->private_key, &a);
hmac_sha512(inout->chain_code, 32, data, sizeof(data), I);
if (inout->curve->params) {
while (true) {
bool failed = false;
bn_read_be(I, &b);
if (!bn_is_less(&b, &inout->curve->params->order)) { // >= order
failed = true;
} else {
bn_addmod(&b, &a, &inout->curve->params->order);
bn_mod(&b, &inout->curve->params->order);
if (bn_is_zero(&b)) {
failed = true;
}
}
if (!failed) {
bn_write_be(&b, inout->private_key);
break;
}
data[0] = 1;
memcpy(data + 1, I + 32, 32);
hmac_sha512(inout->chain_code, 32, data, sizeof(data), I);
}
} else {
memcpy(inout->private_key, I, 32);
}
memcpy(inout->chain_code, I + 32, 32);
inout->depth++;
inout->child_num = i;
hdnode_fill_public_key(inout);
// making sure to wipe our memory
MEMSET_BZERO(&a, sizeof(a));
MEMSET_BZERO(&b, sizeof(b));
MEMSET_BZERO(I, sizeof(I));
MEMSET_BZERO(fingerprint, sizeof(fingerprint));
MEMSET_BZERO(data, sizeof(data));
return 1;
}
int hdnode_public_ckd(HDNode *inout, uint32_t i)
{
uint8_t data[1 + 32 + 4];
uint8_t I[32 + 32];
uint8_t fingerprint[32];
curve_point a, b;
bignum256 c;
if (i & 0x80000000) { // private derivation
return 0;
} else { // public derivation
if (!inout->curve->params) {
return 0;
}
memcpy(data, inout->public_key, 33);
}
write_be(data + 33, i);
sha256_Raw(inout->public_key, 33, fingerprint);
ripemd160(fingerprint, 32, fingerprint);
inout->fingerprint = (fingerprint[0] << 24) + (fingerprint[1] << 16) + (fingerprint[2] << 8) + fingerprint[3];
memset(inout->private_key, 0, 32);
if (!ecdsa_read_pubkey(inout->curve->params, inout->public_key, &a)) {
return 0;
}
while (true) {
bool failed = false;
hmac_sha512(inout->chain_code, 32, data, sizeof(data), I);
bn_read_be(I, &c);
if (!bn_is_less(&c, &inout->curve->params->order)) { // >= order
failed = true;
} else {
scalar_multiply(inout->curve->params, &c, &b); // b = c * G
point_add(inout->curve->params, &a, &b); // b = a + b
if (point_is_infinity(&b)) {
failed = true;
}
}
if (!failed) {
inout->public_key[0] = 0x02 | (b.y.val[0] & 0x01);
bn_write_be(&b.x, inout->public_key + 1);
break;
}
data[0] = 1;
memcpy(data + 1, I + 32, 32);
}
inout->depth++;
inout->child_num = i;
memcpy(inout->chain_code, I + 32, 32);
// Wipe all stack data.
MEMSET_BZERO(data, sizeof(data));
MEMSET_BZERO(I, sizeof(I));
MEMSET_BZERO(fingerprint, sizeof(fingerprint));
MEMSET_BZERO(&a, sizeof(a));
MEMSET_BZERO(&b, sizeof(b));
MEMSET_BZERO(&c, sizeof(c));
return 1;
}
int hdnode_public_ckd_address_optimized(const curve_point *pub, const uint8_t *public_key, const uint8_t *chain_code, uint32_t i, uint8_t version, char *addr, int addrsize)
{
uint8_t data[1 + 32 + 4];
uint8_t I[32 + 32];
uint8_t child_pubkey[33];
curve_point b;
bignum256 c;
if (i & 0x80000000) { // private derivation
return 0;
}
memcpy(data, public_key, 33);
write_be(data + 33, i);
while (true) {
bool failed = false;
hmac_sha512(chain_code, 32, data, sizeof(data), I);
bn_read_be(I, &c);
if (!bn_is_less(&c, &secp256k1.order)) { // >= order
failed = true;
} else {
scalar_multiply(&secp256k1, &c, &b); // b = c * G
point_add(&secp256k1, pub, &b); // b = a + b
if (point_is_infinity(&b)) {
failed = true;
}
}
if (!failed) {
child_pubkey[0] = 0x02 | (b.y.val[0] & 0x01);
bn_write_be(&b.x, child_pubkey + 1);
break;
}
data[0] = 1;
memcpy(data + 1, I + 32, 32);
}
ecdsa_get_address(child_pubkey, version, addr, addrsize);
return 1;
}
#if USE_BIP32_CACHE
static bool private_ckd_cache_root_set = false;
static HDNode private_ckd_cache_root;
static int private_ckd_cache_index = 0;
static struct {
bool set;
size_t depth;
uint32_t i[BIP32_CACHE_MAXDEPTH];
HDNode node;
} private_ckd_cache[BIP32_CACHE_SIZE];
int hdnode_private_ckd_cached(HDNode *inout, const uint32_t *i, size_t i_count)
{
if (i_count == 0) {
return 1;
}
if (i_count == 1) {
if (hdnode_private_ckd(inout, i[0]) == 0) return 0;
return 1;
}
bool found = false;
// if root is not set or not the same
if (!private_ckd_cache_root_set || memcmp(&private_ckd_cache_root, inout, sizeof(HDNode)) != 0) {
// clear the cache
private_ckd_cache_index = 0;
memset(private_ckd_cache, 0, sizeof(private_ckd_cache));
// setup new root
memcpy(&private_ckd_cache_root, inout, sizeof(HDNode));
private_ckd_cache_root_set = true;
} else {
// try to find parent
int j;
for (j = 0; j < BIP32_CACHE_SIZE; j++) {
if (private_ckd_cache[j].set &&
private_ckd_cache[j].depth == i_count - 1 &&
memcmp(private_ckd_cache[j].i, i, (i_count - 1) * sizeof(uint32_t)) == 0 &&
private_ckd_cache[j].node.curve == inout->curve) {
memcpy(inout, &(private_ckd_cache[j].node), sizeof(HDNode));
found = true;
break;
}
}
}
// else derive parent
if (!found) {
size_t k;
for (k = 0; k < i_count - 1; k++) {
if (hdnode_private_ckd(inout, i[k]) == 0) return 0;
}
// and save it
memset(&(private_ckd_cache[private_ckd_cache_index]), 0, sizeof(private_ckd_cache[private_ckd_cache_index]));
private_ckd_cache[private_ckd_cache_index].set = true;
private_ckd_cache[private_ckd_cache_index].depth = i_count - 1;
memcpy(private_ckd_cache[private_ckd_cache_index].i, i, (i_count - 1) * sizeof(uint32_t));
memcpy(&(private_ckd_cache[private_ckd_cache_index].node), inout, sizeof(HDNode));
private_ckd_cache_index = (private_ckd_cache_index + 1) % BIP32_CACHE_SIZE;
}
if (hdnode_private_ckd(inout, i[i_count - 1]) == 0) return 0;
return 1;
}
#endif
void hdnode_fill_public_key(HDNode *node)
{
if (node->curve == &ed25519_info) {
node->public_key[0] = 0;
ed25519_publickey(node->private_key, node->public_key + 1);
} else {
ecdsa_get_public_key33(node->curve->params, node->private_key, node->public_key);
}
}
// msg is a data to be signed
// msg_len is the message length
int hdnode_sign(const HDNode *node, const uint8_t *msg, uint32_t msg_len, uint8_t *sig, uint8_t *pby)
{
if (node->curve == &ed25519_info) {
ed25519_sign(msg, msg_len, node->private_key, node->public_key + 1, sig);
return 0;
} else {
return ecdsa_sign(node->curve->params, node->private_key, msg, msg_len, sig, pby);
}
}
int hdnode_sign_digest(const HDNode *node, const uint8_t *digest, uint8_t *sig, uint8_t *pby)
{
if (node->curve == &ed25519_info) {
ed25519_sign(digest, 32, node->private_key, node->public_key + 1, sig);
return 0;
} else {
return ecdsa_sign_digest(node->curve->params, node->private_key, digest, sig, pby);
}
}
void hdnode_serialize(const HDNode *node, uint32_t version, char use_public, char *str, int strsize)
{
uint8_t node_data[78];
write_be(node_data, version);
node_data[4] = node->depth;
write_be(node_data + 5, node->fingerprint);
write_be(node_data + 9, node->child_num);
memcpy(node_data + 13, node->chain_code, 32);
if (use_public) {
memcpy(node_data + 45, node->public_key, 33);
} else {
node_data[45] = 0;
memcpy(node_data + 46, node->private_key, 32);
}
base58_encode_check(node_data, sizeof(node_data), str, strsize);
MEMSET_BZERO(node_data, sizeof(node_data));
}
void hdnode_serialize_public(const HDNode *node, char *str, int strsize)
{
hdnode_serialize(node, 0x0488B21E, 1, str, strsize);
}
void hdnode_serialize_private(const HDNode *node, char *str, int strsize)
{
hdnode_serialize(node, 0x0488ADE4, 0, str, strsize);
}
// check for validity of curve point in case of public data not performed
int hdnode_deserialize(const char *str, HDNode *node)
{
uint8_t node_data[78];
memset(node, 0, sizeof(HDNode));
if (base58_decode_check(str, node_data, sizeof(node_data)) != sizeof(node_data)) {
return -1;
}
node->curve = get_curve_by_name(SECP256K1_NAME);
uint32_t version = read_be(node_data);
if (version == 0x0488B21E) { // public node
memcpy(node->public_key, node_data + 45, 33);
} else if (version == 0x0488ADE4) { // private node
if (node_data[45]) { // invalid data
return -2;
}
memcpy(node->private_key, node_data + 46, 32);
hdnode_fill_public_key(node);
} else {
return -3; // invalid version
}
node->depth = node_data[4];
node->fingerprint = read_be(node_data + 5);
node->child_num = read_be(node_data + 9);
memcpy(node->chain_code, node_data + 13, 32);
return 0;
}
const curve_info *get_curve_by_name(const char *curve_name) {
if (curve_name == 0) {
return 0;
}
if (strcmp(curve_name, SECP256K1_NAME) == 0) {
return &secp256k1_info;
}
if (strcmp(curve_name, NIST256P1_NAME) == 0) {
return &nist256p1_info;
}
if (strcmp(curve_name, ED25519_NAME) == 0) {
return &ed25519_info;
}
return 0;
}