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trezor-firmware/legacy/firmware/crypto.c
matejcik f4425a3ac1 feat(legacy): implement CoSi verification
2023-03-24 13:24:46 +01:00

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/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "crypto.h"
#include <string.h>
#include "address.h"
#include "aes/aes.h"
#include "base58.h"
#include "bip32.h"
#include "coins.h"
#include "curves.h"
#include "hmac.h"
#include "layout.h"
#include "pbkdf2.h"
#include "secp256k1.h"
#include "segwit_addr.h"
#include "sha2.h"
#if !BITCOIN_ONLY
#include "cash_addr.h"
#endif
uint32_t ser_length(uint32_t len, uint8_t *out) {
if (len < 253) {
out[0] = len & 0xFF;
return 1;
}
if (len < 0x10000) {
out[0] = 253;
out[1] = len & 0xFF;
out[2] = (len >> 8) & 0xFF;
return 3;
}
out[0] = 254;
out[1] = len & 0xFF;
out[2] = (len >> 8) & 0xFF;
out[3] = (len >> 16) & 0xFF;
out[4] = (len >> 24) & 0xFF;
return 5;
}
uint32_t ser_length_hash(Hasher *hasher, uint32_t len) {
if (len < 253) {
hasher_Update(hasher, (const uint8_t *)&len, 1);
return 1;
}
if (len < 0x10000) {
uint8_t d = 253;
hasher_Update(hasher, &d, 1);
hasher_Update(hasher, (const uint8_t *)&len, 2);
return 3;
}
uint8_t d = 254;
hasher_Update(hasher, &d, 1);
hasher_Update(hasher, (const uint8_t *)&len, 4);
return 5;
}
uint32_t deser_length(const uint8_t *in, uint32_t *out) {
if (in[0] < 253) {
*out = in[0];
return 1;
}
if (in[0] == 253) {
*out = in[1] + (in[2] << 8);
return 1 + 2;
}
if (in[0] == 254) {
*out = in[1] + (in[2] << 8) + (in[3] << 16) + ((uint32_t)in[4] << 24);
return 1 + 4;
}
*out = 0; // ignore 64 bit
return 1 + 8;
}
int sshMessageSign(HDNode *node, const uint8_t *message, size_t message_len,
uint8_t *signature) {
signature[0] = 0; // prefix: pad with zero, so all signatures are 65 bytes
return hdnode_sign(node, message, message_len, HASHER_SHA2, signature + 1,
NULL, NULL);
}
int gpgMessageSign(HDNode *node, const uint8_t *message, size_t message_len,
uint8_t *signature) {
signature[0] = 0; // prefix: pad with zero, so all signatures are 65 bytes
const curve_info *ed25519_curve_info = get_curve_by_name(ED25519_NAME);
if (ed25519_curve_info && node->curve == ed25519_curve_info) {
// GPG supports variable size digest for Ed25519 signatures
return hdnode_sign(node, message, message_len, 0, signature + 1, NULL,
NULL);
} else {
// Ensure 256-bit digest before proceeding
if (message_len != 32) {
return 1;
}
return hdnode_sign_digest(node, message, signature + 1, NULL, NULL);
}
}
int signifyMessageSign(HDNode *node, const uint8_t *message, size_t message_len,
uint8_t *signature) {
signature[0] = 0; // prefix: pad with zero, so all signatures are 65 bytes
const curve_info *ed25519_curve_info = get_curve_by_name(ED25519_NAME);
// only ed25519 is supported
if (!ed25519_curve_info || node->curve != ed25519_curve_info) {
return 1;
}
return hdnode_sign(node, message, message_len, 0, signature + 1, NULL, NULL);
}
static void cryptoMessageHash(const CoinInfo *coin, const uint8_t *message,
size_t message_len,
uint8_t hash[HASHER_DIGEST_LENGTH]) {
Hasher hasher = {0};
hasher_Init(&hasher, coin->curve->hasher_sign);
hasher_Update(&hasher, (const uint8_t *)coin->signed_message_header,
strlen(coin->signed_message_header));
uint8_t varint[5] = {0};
uint32_t l = ser_length(message_len, varint);
hasher_Update(&hasher, varint, l);
hasher_Update(&hasher, message, message_len);
hasher_Final(&hasher, hash);
}
int cryptoMessageSign(const CoinInfo *coin, HDNode *node,
InputScriptType script_type, bool no_script_type,
const uint8_t *message, size_t message_len,
uint8_t *signature) {
uint8_t script_type_info = 0;
switch (script_type) {
case InputScriptType_SPENDADDRESS:
// p2pkh
script_type_info = 0;
break;
case InputScriptType_SPENDP2SHWITNESS:
// segwit-in-p2sh
script_type_info = 4;
break;
case InputScriptType_SPENDWITNESS:
// segwit
script_type_info = 8;
break;
default:
// unsupported script type
return 1;
}
if (no_script_type) {
script_type_info = 0;
}
uint8_t hash[HASHER_DIGEST_LENGTH] = {0};
cryptoMessageHash(coin, message, message_len, hash);
uint8_t pby = 0;
int result = hdnode_sign_digest(node, hash, signature + 1, &pby, NULL);
if (result == 0) {
signature[0] = 31 + pby + script_type_info;
}
return result;
}
// Determines the script type from a non-multisig address.
static InputScriptType address_to_script_type(const CoinInfo *coin,
const char *address) {
uint8_t addr_raw[MAX_ADDR_RAW_SIZE] = {0};
size_t addr_raw_len = 0;
// Native SegWit
if (coin->bech32_prefix) {
int witver = 0;
if (segwit_addr_decode(&witver, addr_raw, &addr_raw_len,
coin->bech32_prefix, address)) {
switch (witver) {
case 0:
return InputScriptType_SPENDWITNESS;
case 1:
return InputScriptType_SPENDTAPROOT;
default:
return InputScriptType_EXTERNAL; // unknown script type
}
}
}
#if !BITCOIN_ONLY
if (coin->cashaddr_prefix &&
cash_addr_decode(addr_raw, &addr_raw_len, coin->cashaddr_prefix,
address)) {
return InputScriptType_SPENDADDRESS;
}
#endif
addr_raw_len = base58_decode_check(address, coin->curve->hasher_base58,
addr_raw, sizeof(addr_raw));
// P2PKH
if (addr_raw_len > address_prefix_bytes_len(coin->address_type) &&
address_check_prefix(addr_raw, coin->address_type)) {
return InputScriptType_SPENDADDRESS;
}
// P2SH
if (addr_raw_len > address_prefix_bytes_len(coin->address_type_p2sh) &&
address_check_prefix(addr_raw, coin->address_type_p2sh)) {
return InputScriptType_SPENDP2SHWITNESS;
}
return InputScriptType_EXTERNAL; // unknown script type
}
int cryptoMessageVerify(const CoinInfo *coin, const uint8_t *message,
size_t message_len, const char *address,
const uint8_t *signature) {
// check if the address is correct
InputScriptType script_type = address_to_script_type(coin, address);
if (script_type == InputScriptType_EXTERNAL) {
return 1; // invalid address
}
if (signature[0] >= 27 && signature[0] <= 34) {
// p2pkh or no script type provided
// use the script type from the address
} else if (signature[0] >= 35 && signature[0] <= 38) {
// segwit-in-p2sh
if (script_type != InputScriptType_SPENDP2SHWITNESS) {
return 2; // script type mismatch
}
} else if (signature[0] >= 39 && signature[0] <= 42) {
// segwit
if (script_type != InputScriptType_SPENDWITNESS) {
return 2; // script type mismatch
}
} else {
return 3; // invalid signature prefix
}
uint8_t hash[HASHER_DIGEST_LENGTH] = {0};
cryptoMessageHash(coin, message, message_len, hash);
uint8_t recid = (signature[0] - 27) % 4;
bool compressed = signature[0] >= 31;
// check if signature verifies the digest and recover the public key
uint8_t pubkey[65] = {0};
if (ecdsa_recover_pub_from_sig(coin->curve->params, pubkey, signature + 1,
hash, recid) != 0) {
return 4; // invalid signature data
}
// convert public key to compressed pubkey if necessary
if (compressed) {
pubkey[0] = 0x02 | (pubkey[64] & 1);
}
uint8_t addr_raw[MAX_ADDR_RAW_SIZE] = {0};
uint8_t recovered_raw[MAX_ADDR_RAW_SIZE] = {0};
if (script_type == InputScriptType_SPENDADDRESS) {
// p2pkh
size_t len = 0;
#if !BITCOIN_ONLY
if (coin->cashaddr_prefix) {
if (!cash_addr_decode(addr_raw, &len, coin->cashaddr_prefix, address)) {
return 1; // invalid address
}
} else
#endif
{
len = base58_decode_check(address, coin->curve->hasher_base58, addr_raw,
MAX_ADDR_RAW_SIZE);
}
ecdsa_get_address_raw(pubkey, coin->address_type,
coin->curve->hasher_pubkey, recovered_raw);
if (memcmp(recovered_raw, addr_raw, len) != 0 ||
len != address_prefix_bytes_len(coin->address_type) + 20) {
return 5; // signature does not match address and message
}
} else if (script_type == InputScriptType_SPENDP2SHWITNESS) {
// segwit-in-p2sh
size_t len = base58_decode_check(address, coin->curve->hasher_base58,
addr_raw, MAX_ADDR_RAW_SIZE);
ecdsa_get_address_segwit_p2sh_raw(pubkey, coin->address_type_p2sh,
coin->curve->hasher_pubkey,
recovered_raw);
if (memcmp(recovered_raw, addr_raw, len) != 0 ||
len != address_prefix_bytes_len(coin->address_type_p2sh) + 20) {
return 5; // signature does not match address and message
}
} else if (script_type == InputScriptType_SPENDWITNESS) {
// segwit
int witver = 0;
size_t len = 0;
if (!coin->bech32_prefix ||
!segwit_addr_decode(&witver, recovered_raw, &len, coin->bech32_prefix,
address)) {
return 1; // invalid address
}
ecdsa_get_pubkeyhash(pubkey, coin->curve->hasher_pubkey, addr_raw);
if (memcmp(recovered_raw, addr_raw, len) != 0 || witver != 0 || len != 20) {
return 5; // signature does not match address and message
}
} else {
return 1; // invalid address
}
return 0;
}
const HDNode *cryptoMultisigPubkey(const CoinInfo *coin,
const MultisigRedeemScriptType *multisig,
uint32_t index) {
const HDNodeType *node_ptr = NULL;
const uint32_t *address_n = NULL;
uint32_t address_n_count = 0;
if (multisig->nodes_count) { // use multisig->nodes
if (index >= multisig->nodes_count) {
return 0;
}
node_ptr = &(multisig->nodes[index]);
address_n = multisig->address_n;
address_n_count = multisig->address_n_count;
} else if (multisig->pubkeys_count) { // use multisig->pubkeys
if (index >= multisig->pubkeys_count) {
return 0;
}
node_ptr = &(multisig->pubkeys[index].node);
address_n = multisig->pubkeys[index].address_n;
address_n_count = multisig->pubkeys[index].address_n_count;
} else {
return 0;
}
if (node_ptr->chain_code.size != 32) return 0;
if (node_ptr->public_key.size != 33) return 0;
static HDNode node;
if (!hdnode_from_xpub(node_ptr->depth, node_ptr->child_num,
node_ptr->chain_code.bytes, node_ptr->public_key.bytes,
coin->curve_name, &node)) {
return 0;
}
layoutProgressUpdate(true);
for (uint32_t i = 0; i < address_n_count; i++) {
if (!hdnode_public_ckd(&node, address_n[i])) {
return 0;
}
layoutProgressUpdate(true);
}
return &node;
}
uint32_t cryptoMultisigPubkeyCount(const MultisigRedeemScriptType *multisig) {
return multisig->nodes_count ? multisig->nodes_count
: multisig->pubkeys_count;
}
int cryptoMultisigPubkeyIndex(const CoinInfo *coin,
const MultisigRedeemScriptType *multisig,
const uint8_t *pubkey) {
for (size_t i = 0; i < cryptoMultisigPubkeyCount(multisig); i++) {
const HDNode *pubnode = cryptoMultisigPubkey(coin, multisig, i);
if (pubnode && memcmp(pubnode->public_key, pubkey, 33) == 0) {
return i;
}
}
return -1;
}
int cryptoMultisigFingerprint(const MultisigRedeemScriptType *multisig,
uint8_t *hash) {
static const HDNodeType *pubnodes[15], *swap;
const uint32_t n = cryptoMultisigPubkeyCount(multisig);
if (n < 1 || n > 15) {
return 0;
}
if (multisig->m < 1 || multisig->m > 15) {
return 0;
}
for (uint32_t i = 0; i < n; i++) {
if (multisig->nodes_count) { // use multisig->nodes
pubnodes[i] = &(multisig->nodes[i]);
} else if (multisig->pubkeys_count) { // use multisig->pubkeys
pubnodes[i] = &(multisig->pubkeys[i].node);
} else {
return 0;
}
}
for (uint32_t i = 0; i < n; i++) {
if (pubnodes[i]->public_key.size != 33) return 0;
if (pubnodes[i]->chain_code.size != 32) return 0;
}
// minsort according to pubkey
for (uint32_t i = 0; i < n - 1; i++) {
for (uint32_t j = n - 1; j > i; j--) {
if (memcmp(pubnodes[i]->public_key.bytes, pubnodes[j]->public_key.bytes,
33) > 0) {
swap = pubnodes[i];
pubnodes[i] = pubnodes[j];
pubnodes[j] = swap;
}
}
}
// hash sorted nodes
SHA256_CTX ctx = {0};
sha256_Init(&ctx);
sha256_Update(&ctx, (const uint8_t *)&(multisig->m), sizeof(uint32_t));
for (uint32_t i = 0; i < n; i++) {
sha256_Update(&ctx, (const uint8_t *)&(pubnodes[i]->depth),
sizeof(uint32_t));
sha256_Update(&ctx, (const uint8_t *)&(pubnodes[i]->fingerprint),
sizeof(uint32_t));
sha256_Update(&ctx, (const uint8_t *)&(pubnodes[i]->child_num),
sizeof(uint32_t));
sha256_Update(&ctx, pubnodes[i]->chain_code.bytes, 32);
sha256_Update(&ctx, pubnodes[i]->public_key.bytes, 33);
}
sha256_Update(&ctx, (const uint8_t *)&n, sizeof(uint32_t));
sha256_Final(&ctx, hash);
layoutProgressUpdate(true);
return 1;
}
int cryptoIdentityFingerprint(const IdentityType *identity, uint8_t *hash) {
SHA256_CTX ctx = {0};
sha256_Init(&ctx);
sha256_Update(&ctx, (const uint8_t *)&(identity->index), sizeof(uint32_t));
if (identity->has_proto && identity->proto[0]) {
sha256_Update(&ctx, (const uint8_t *)(identity->proto),
strlen(identity->proto));
sha256_Update(&ctx, (const uint8_t *)"://", 3);
}
if (identity->has_user && identity->user[0]) {
sha256_Update(&ctx, (const uint8_t *)(identity->user),
strlen(identity->user));
sha256_Update(&ctx, (const uint8_t *)"@", 1);
}
if (identity->has_host && identity->host[0]) {
sha256_Update(&ctx, (const uint8_t *)(identity->host),
strlen(identity->host));
}
if (identity->has_port && identity->port[0]) {
sha256_Update(&ctx, (const uint8_t *)":", 1);
sha256_Update(&ctx, (const uint8_t *)(identity->port),
strlen(identity->port));
}
if (identity->has_path && identity->path[0]) {
sha256_Update(&ctx, (const uint8_t *)(identity->path),
strlen(identity->path));
}
sha256_Final(&ctx, hash);
return 1;
}
static bool check_cointype(const CoinInfo *coin, uint32_t slip44, bool full) {
#if BITCOIN_ONLY
(void)full;
#else
if (!full) {
// Some wallets such as Electron-Cash (BCH) store coins on Bitcoin paths.
// We can allow spending these coins from Bitcoin paths if the coin has
// implemented strong replay protection via SIGHASH_FORKID. However, we
// cannot allow spending any testnet coins from Bitcoin paths, because
// otherwise an attacker could trick the user into spending BCH on a Bitcoin
// path by signing a seemingly harmless BCH Testnet transaction.
if (slip44 == SLIP44_BITCOIN && coin->has_fork_id &&
coin->coin_type != SLIP44_TESTNET) {
return true;
}
}
#endif
return coin->coin_type == slip44;
}
bool coin_path_check(const CoinInfo *coin, InputScriptType script_type,
uint32_t address_n_count, const uint32_t *address_n,
bool has_multisig, PathSchema unlock, bool full_check) {
// This function checks that the path is a recognized path for the given coin.
// Used by GetAddress to prevent ransom attacks where a user could be coerced
// to use an address with an unenumerable path and used by SignTx to ensure
// that a user cannot be coerced into signing a testnet transaction or a
// Litecoin transaction which in fact spends Bitcoin. If full_check is true,
// then this function also checks that the path fully matches the script type
// and coin type. This is used to determine whether a warning should be shown.
if (address_n_count == 0) {
return false;
}
bool valid = true;
// m/44' : BIP44 Legacy
// m / purpose' / coin_type' / account' / change / address_index
if (address_n[0] == PATH_HARDENED + 44) {
valid = valid && (address_n_count == 5);
valid = valid && check_cointype(coin, address_n[1], full_check);
valid = valid && (address_n[2] & PATH_HARDENED);
valid = valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
valid = valid && (script_type == InputScriptType_SPENDADDRESS);
valid = valid && (!has_multisig);
}
return valid;
}
if (address_n[0] == PATH_HARDENED + 45) {
if (address_n_count == 4) {
// m/45' - BIP45 Copay Abandoned Multisig P2SH
// m / purpose' / cosigner_index / change / address_index
// Patterns without a coin_type field must be treated as Bitcoin paths.
valid = valid && check_cointype(coin, SLIP44_BITCOIN, false);
valid = valid && (address_n[1] <= 100);
valid = valid && (address_n[2] <= PATH_MAX_CHANGE);
valid = valid && (address_n[3] <= PATH_MAX_ADDRESS_INDEX);
} else if (address_n_count == 5) {
if (address_n[1] & PATH_HARDENED) {
// Unchained Capital compatibility pattern. Will be removed in the
// future.
// m / 45' / coin_type' / account' / [0-1000000] / address_index
valid = valid && check_cointype(coin, address_n[1], full_check);
valid = valid && (address_n[2] & PATH_HARDENED);
valid =
valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= 1000000);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
} else {
// Casa proposed "universal multisig" pattern with unhardened parts.
// m/45'/coin_type/account/change/address_index
valid = valid &&
check_cointype(coin, address_n[1] | PATH_HARDENED, full_check);
valid = valid && (address_n[2] <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
}
} else if (address_n_count == 6) {
// Unchained Capital compatibility pattern. Will be removed in the
// future.
// m/45'/coin_type'/account'/[0-1000000]/change/address_index
// m/45'/coin_type/account/[0-1000000]/change/address_index
valid = valid &&
check_cointype(coin, PATH_HARDENED | address_n[1], full_check);
valid = valid && ((address_n[1] & PATH_HARDENED) ==
(address_n[2] & PATH_HARDENED));
valid =
valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= 1000000);
valid = valid && (address_n[4] <= PATH_MAX_CHANGE);
valid = valid && (address_n[5] <= PATH_MAX_ADDRESS_INDEX);
} else {
return false;
}
if (full_check) {
valid = valid && (script_type == InputScriptType_SPENDADDRESS ||
script_type == InputScriptType_SPENDMULTISIG);
valid = valid && has_multisig;
}
return valid;
}
if (address_n[0] == PATH_HARDENED + 48) {
valid = valid && (address_n_count == 5 || address_n_count == 6);
valid = valid && check_cointype(coin, address_n[1], full_check);
valid = valid && (address_n[2] & PATH_HARDENED);
valid = valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
if (address_n_count == 5) {
// [OBSOLETE] m/48' Copay Multisig P2SH
// m / purpose' / coin_type' / account' / change / address_index
// NOTE: this pattern is not recognized by trezor-core
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
valid = valid && has_multisig;
valid = valid && (script_type == InputScriptType_SPENDMULTISIG);
}
} else if (address_n_count == 6) {
// BIP-48:
// m / purpose' / coin_type' / account' / type' / change / address_index
valid = valid && (address_n[3] & PATH_HARDENED);
uint32_t type = address_n[3] & PATH_UNHARDEN_MASK;
valid = valid && (type <= 2);
valid = valid && (type == 0 || coin->has_segwit);
valid = valid && (address_n[4] <= PATH_MAX_CHANGE);
valid = valid && (address_n[5] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
valid = valid && has_multisig;
switch (type) {
case 0:
valid = valid && (script_type == InputScriptType_SPENDMULTISIG ||
script_type == InputScriptType_SPENDADDRESS);
break;
case 1:
valid = valid && (script_type == InputScriptType_SPENDP2SHWITNESS);
break;
case 2:
valid = valid && (script_type == InputScriptType_SPENDWITNESS);
break;
default:
return false;
}
}
} else {
return false;
}
return valid;
}
// m/49' : BIP49 SegWit
// m / purpose' / coin_type' / account' / change / address_index
if (address_n[0] == PATH_HARDENED + 49) {
valid = valid && coin->has_segwit;
valid = valid && (address_n_count == 5);
valid = valid && check_cointype(coin, address_n[1], full_check);
valid = valid && (address_n[2] & PATH_HARDENED);
valid = valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
valid = valid && (script_type == InputScriptType_SPENDP2SHWITNESS);
}
return valid;
}
// m/84' : BIP84 Native SegWit
// m / purpose' / coin_type' / account' / change / address_index
if (address_n[0] == PATH_HARDENED + 84) {
valid = valid && coin->has_segwit;
valid = valid && (coin->bech32_prefix != NULL);
valid = valid && (address_n_count == 5);
valid = valid && check_cointype(coin, address_n[1], full_check);
valid = valid && (address_n[2] & PATH_HARDENED);
valid = valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
valid = valid && (script_type == InputScriptType_SPENDWITNESS);
}
return valid;
}
// m/86' : BIP86 Taproot
// m / purpose' / coin_type' / account' / change / address_index
if (address_n[0] == PATH_HARDENED + 86) {
valid = valid && coin->has_taproot;
valid = valid && (coin->bech32_prefix != NULL);
valid = valid && (address_n_count == 5);
valid = valid && check_cointype(coin, address_n[1], full_check);
valid = valid && (address_n[2] & PATH_HARDENED);
valid = valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
// we do not support Multisig with Taproot yet
valid = valid && !has_multisig;
valid = valid && (script_type == InputScriptType_SPENDTAPROOT);
}
return valid;
}
// Green Address compatibility pattern. Will be removed in the future.
// m / [1,4] / address_index
if (address_n[0] == 1 || address_n[0] == 4) {
valid = valid && (coin->coin_type == SLIP44_BITCOIN);
valid = valid && (address_n_count == 2);
valid = valid && (address_n[1] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
valid = valid && (script_type != InputScriptType_SPENDTAPROOT);
}
return valid;
}
// Green Address compatibility pattern. Will be removed in the future.
// m / 3' / [1-100]' / [1,4] / address_index
if (address_n[0] == PATH_HARDENED + 3) {
valid = valid && (coin->coin_type == SLIP44_BITCOIN);
valid = valid && (address_n_count == 4);
valid = valid && (address_n[1] & PATH_HARDENED);
valid = valid && ((address_n[1] & PATH_UNHARDEN_MASK) <= 100);
valid = valid && (address_n[2] == 1 || address_n[2] == 4);
valid = valid && (address_n[3] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
valid = valid && (script_type != InputScriptType_SPENDTAPROOT);
}
return valid;
}
// Green Address compatibility patterns. Will be removed in the future.
// m / 1195487518
// m / 1195487518 / 6 / address_index
if (address_n[0] == 1195487518) {
valid = valid && (coin->coin_type == SLIP44_BITCOIN);
if (address_n_count == 3) {
valid = valid && (address_n[1] == 6);
valid = valid && (address_n[2] <= PATH_MAX_ADDRESS_INDEX);
} else if (address_n_count != 1) {
return false;
}
if (full_check) {
return false;
}
return valid;
}
// Casa compatibility pattern. Will be removed in the future.
// m / 49 / coin_type / account / change / address_index
if (address_n[0] == 49) {
valid = valid && (address_n_count == 5);
valid =
valid && check_cointype(coin, PATH_HARDENED | address_n[1], full_check);
valid = valid && ((address_n[1] & PATH_HARDENED) == 0);
valid = valid && (address_n[2] <= PATH_MAX_ACCOUNT);
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
valid = valid && (script_type == InputScriptType_SPENDP2SHWITNESS);
}
return valid;
}
// m/10025' : SLIP25 CoinJoin
// m / purpose' / coin_type' / account' / script_type' / change /
// address_index
if (address_n[0] == PATH_SLIP25_PURPOSE) {
valid = valid && coin->has_taproot;
valid = valid && (coin->bech32_prefix != NULL);
valid = valid && (address_n_count == 6);
valid = valid && check_cointype(coin, address_n[1], full_check);
valid = valid && (address_n[2] == (PATH_HARDENED | 0)); // Only first acc.
valid = valid && (address_n[3] == (PATH_HARDENED | 1)); // Only SegWit v1.
valid = valid && (address_n[4] <= PATH_MAX_CHANGE);
valid = valid &&
((unlock == SCHEMA_SLIP25_TAPROOT) ||
(unlock == SCHEMA_SLIP25_TAPROOT_EXTERNAL && address_n[4] == 0));
valid = valid && (address_n[5] <= PATH_MAX_ADDRESS_INDEX);
if (full_check) {
// we do not support Multisig for CoinJoin
valid = valid && !has_multisig;
valid = valid && (script_type == InputScriptType_SPENDTAPROOT);
}
return valid;
}
// unknown path
return false;
}
bool is_multisig_input_script_type(InputScriptType script_type) {
// we do not support Multisig with Taproot yet
if (script_type == InputScriptType_SPENDMULTISIG ||
script_type == InputScriptType_SPENDP2SHWITNESS ||
script_type == InputScriptType_SPENDWITNESS) {
return true;
}
return false;
}
bool is_multisig_output_script_type(OutputScriptType script_type) {
// we do not support Multisig with Taproot yet
if (script_type == OutputScriptType_PAYTOMULTISIG ||
script_type == OutputScriptType_PAYTOP2SHWITNESS ||
script_type == OutputScriptType_PAYTOWITNESS) {
return true;
}
return false;
}
bool is_internal_input_script_type(InputScriptType script_type) {
if (script_type == InputScriptType_SPENDADDRESS ||
script_type == InputScriptType_SPENDMULTISIG ||
script_type == InputScriptType_SPENDP2SHWITNESS ||
script_type == InputScriptType_SPENDWITNESS ||
script_type == InputScriptType_SPENDTAPROOT) {
return true;
}
return false;
}
bool is_change_output_script_type(OutputScriptType script_type) {
if (script_type == OutputScriptType_PAYTOADDRESS ||
script_type == OutputScriptType_PAYTOMULTISIG ||
script_type == OutputScriptType_PAYTOP2SHWITNESS ||
script_type == OutputScriptType_PAYTOWITNESS ||
script_type == OutputScriptType_PAYTOTAPROOT) {
return true;
}
return false;
}
bool is_segwit_input_script_type(InputScriptType script_type) {
if (script_type == InputScriptType_SPENDP2SHWITNESS ||
script_type == InputScriptType_SPENDWITNESS ||
script_type == InputScriptType_SPENDTAPROOT) {
return true;
}
return false;
}
bool is_segwit_output_script_type(OutputScriptType script_type) {
if (script_type == OutputScriptType_PAYTOP2SHWITNESS ||
script_type == OutputScriptType_PAYTOWITNESS ||
script_type == OutputScriptType_PAYTOTAPROOT) {
return true;
}
return false;
}
bool change_output_to_input_script_type(OutputScriptType output_script_type,
InputScriptType *input_script_type) {
switch (output_script_type) {
case OutputScriptType_PAYTOADDRESS:
*input_script_type = InputScriptType_SPENDADDRESS;
return true;
case OutputScriptType_PAYTOMULTISIG:
*input_script_type = InputScriptType_SPENDMULTISIG;
return true;
case OutputScriptType_PAYTOWITNESS:
*input_script_type = InputScriptType_SPENDWITNESS;
return true;
case OutputScriptType_PAYTOP2SHWITNESS:
*input_script_type = InputScriptType_SPENDP2SHWITNESS;
return true;
case OutputScriptType_PAYTOTAPROOT:
*input_script_type = InputScriptType_SPENDTAPROOT;
return true;
default:
return false;
}
}
void slip21_from_seed(const uint8_t *seed, int seed_len, Slip21Node *out) {
hmac_sha512((uint8_t *)"Symmetric key seed", 18, seed, seed_len, out->data);
}
void slip21_derive_path(Slip21Node *inout, const uint8_t *label,
size_t label_len) {
HMAC_SHA512_CTX hctx = {0};
hmac_sha512_Init(&hctx, inout->data, 32);
hmac_sha512_Update(&hctx, (uint8_t *)"\0", 1);
hmac_sha512_Update(&hctx, label, label_len);
hmac_sha512_Final(&hctx, inout->data);
}
const uint8_t *slip21_key(const Slip21Node *node) { return &node->data[32]; }
bool cryptoCosiVerify(const ed25519_signature signature, const uint8_t *message,
const size_t message_len, const int threshold,
const ed25519_public_key *pubkeys,
const int pubkeys_count, const uint8_t sigmask)
{
if (sigmask == 0 || threshold < 1 || pubkeys_count < 1 || pubkeys_count > 8) {
// invalid parameters:
// - sigmask must specify at least one signer
// - at least one signature must be required
// - at least one pubkey must be provided
// - at most 8 pubkeys are supported (bit size of sigmask)
return false;
}
if (sigmask >= (1 << pubkeys_count)) {
// sigmask indicates more signers than provided pubkeys
return false;
}
ed25519_public_key selected_keys[8] = {0};
int N = 0;
for (int i = 0; i < pubkeys_count; i++) {
if (sigmask & (1 << i)) {
memcpy(selected_keys[N], pubkeys[i], sizeof(ed25519_public_key));
N++;
}
}
if (N < threshold) {
// not enough signatures
return false;
}
ed25519_public_key pk_combined = {0};
int res = ed25519_cosi_combine_publickeys(pk_combined, selected_keys, N);
if (res != 0) {
// error combining public keys
return false;
}
res = ed25519_sign_open(message, message_len, pk_combined, signature);
return res == 0;
}
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