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238 lines
6.4 KiB
238 lines
6.4 KiB
/**
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* Copyright (c) 2013-2014 Tomas Dzetkulic
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* Copyright (c) 2013-2014 Pavol Rusnak
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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 "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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int hdnode_from_xpub(uint32_t depth, uint32_t fingerprint, uint32_t child_num, const uint8_t *chain_code, const uint8_t *public_key, HDNode *out)
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{
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curve_point c;
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if (!ecdsa_read_pubkey(public_key, &c)) { // invalid pubkey
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return 0;
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}
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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(out->private_key, 0, 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, HDNode *out)
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{
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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) || !bn_is_less(&a, &order256k1)) { // == 0 or >= order
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return 0;
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}
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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, 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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hmac_sha512((uint8_t *)"Bitcoin seed", 12, seed, seed_len, I);
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memcpy(out->private_key, I, 32);
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bignum256 a;
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bn_read_be(out->private_key, &a);
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if (bn_is_zero(&a) || !bn_is_less(&a, &order256k1)) { // == 0 or >= order
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return 0;
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}
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memcpy(out->chain_code, I + 32, 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_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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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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memcpy(inout->chain_code, I + 32, 32);
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memcpy(inout->private_key, I, 32);
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bn_read_be(inout->private_key, &b);
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if (!bn_is_less(&b, &order256k1)) { // >= order
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return 0;
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}
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bn_addmod(&a, &b, &order256k1);
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if (bn_is_zero(&a)) {
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return 0;
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}
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inout->depth++;
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inout->child_num = i;
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bn_write_be(&a, inout->private_key);
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hdnode_fill_public_key(inout);
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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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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->public_key, &a)) {
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return 0;
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}
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hmac_sha512(inout->chain_code, 32, data, sizeof(data), I);
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memcpy(inout->chain_code, I + 32, 32);
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bn_read_be(I, &c);
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if (!bn_is_less(&c, &order256k1)) { // >= order
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return 0;
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}
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scalar_multiply(&c, &b); // b = c * G
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point_add(&a, &b); // b = a + b
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#if USE_PUBKEY_VALIDATE
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if (!ecdsa_validate_pubkey(&b)) {
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return 0;
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}
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#endif
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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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inout->depth++;
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inout->child_num = i;
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return 1;
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}
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void hdnode_fill_public_key(HDNode *node)
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{
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ecdsa_get_public_key33(node->private_key, node->public_key);
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}
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void hdnode_serialize(const HDNode *node, uint32_t version, char use_public, char *str)
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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, 78, str);
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}
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void hdnode_serialize_public(const HDNode *node, char *str)
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{
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hdnode_serialize(node, 0x0488B21E, 1, str);
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}
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void hdnode_serialize_private(const HDNode *node, char *str)
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{
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hdnode_serialize(node, 0x0488ADE4, 0, str);
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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)) {
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return -1;
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}
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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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