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