mirror of
https://github.com/trezor/trezor-firmware.git
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499 lines
17 KiB
C
499 lines
17 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "crypto.h"
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#include <string.h>
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#include "address.h"
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#include "aes/aes.h"
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#include "base58.h"
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#include "bip32.h"
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#include "cash_addr.h"
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#include "coins.h"
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#include "curves.h"
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#include "hmac.h"
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#include "layout.h"
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#include "pbkdf2.h"
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#include "secp256k1.h"
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#include "segwit_addr.h"
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#include "sha2.h"
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uint32_t ser_length(uint32_t len, uint8_t *out) {
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if (len < 253) {
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out[0] = len & 0xFF;
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return 1;
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}
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if (len < 0x10000) {
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out[0] = 253;
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out[1] = len & 0xFF;
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out[2] = (len >> 8) & 0xFF;
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return 3;
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}
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out[0] = 254;
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out[1] = len & 0xFF;
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out[2] = (len >> 8) & 0xFF;
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out[3] = (len >> 16) & 0xFF;
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out[4] = (len >> 24) & 0xFF;
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return 5;
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}
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uint32_t ser_length_hash(Hasher *hasher, uint32_t len) {
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if (len < 253) {
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hasher_Update(hasher, (const uint8_t *)&len, 1);
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return 1;
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}
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if (len < 0x10000) {
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uint8_t d = 253;
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hasher_Update(hasher, &d, 1);
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hasher_Update(hasher, (const uint8_t *)&len, 2);
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return 3;
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}
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uint8_t d = 254;
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hasher_Update(hasher, &d, 1);
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hasher_Update(hasher, (const uint8_t *)&len, 4);
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return 5;
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}
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uint32_t deser_length(const uint8_t *in, uint32_t *out) {
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if (in[0] < 253) {
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*out = in[0];
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return 1;
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}
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if (in[0] == 253) {
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*out = in[1] + (in[2] << 8);
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return 1 + 2;
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}
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if (in[0] == 254) {
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*out = in[1] + (in[2] << 8) + (in[3] << 16) + ((uint32_t)in[4] << 24);
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return 1 + 4;
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}
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*out = 0; // ignore 64 bit
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return 1 + 8;
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}
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int sshMessageSign(HDNode *node, const uint8_t *message, size_t message_len,
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uint8_t *signature) {
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signature[0] = 0; // prefix: pad with zero, so all signatures are 65 bytes
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return hdnode_sign(node, message, message_len, HASHER_SHA2, signature + 1,
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NULL, NULL);
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}
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int gpgMessageSign(HDNode *node, const uint8_t *message, size_t message_len,
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uint8_t *signature) {
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signature[0] = 0; // prefix: pad with zero, so all signatures are 65 bytes
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const curve_info *ed25519_curve_info = get_curve_by_name(ED25519_NAME);
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if (ed25519_curve_info && node->curve == ed25519_curve_info) {
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// GPG supports variable size digest for Ed25519 signatures
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return hdnode_sign(node, message, message_len, 0, signature + 1, NULL,
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NULL);
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} else {
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// Ensure 256-bit digest before proceeding
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if (message_len != 32) {
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return 1;
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}
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return hdnode_sign_digest(node, message, signature + 1, NULL, NULL);
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}
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}
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static void cryptoMessageHash(const CoinInfo *coin, const uint8_t *message,
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size_t message_len,
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uint8_t hash[HASHER_DIGEST_LENGTH]) {
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Hasher hasher;
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hasher_Init(&hasher, coin->curve->hasher_sign);
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hasher_Update(&hasher, (const uint8_t *)coin->signed_message_header,
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strlen(coin->signed_message_header));
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uint8_t varint[5];
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uint32_t l = ser_length(message_len, varint);
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hasher_Update(&hasher, varint, l);
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hasher_Update(&hasher, message, message_len);
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hasher_Final(&hasher, hash);
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}
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int cryptoMessageSign(const CoinInfo *coin, HDNode *node,
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InputScriptType script_type, const uint8_t *message,
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size_t message_len, uint8_t *signature) {
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uint8_t hash[HASHER_DIGEST_LENGTH];
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cryptoMessageHash(coin, message, message_len, hash);
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uint8_t pby;
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int result = hdnode_sign_digest(node, hash, signature + 1, &pby, NULL);
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if (result == 0) {
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switch (script_type) {
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case InputScriptType_SPENDP2SHWITNESS:
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// segwit-in-p2sh
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signature[0] = 35 + pby;
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break;
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case InputScriptType_SPENDWITNESS:
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// segwit
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signature[0] = 39 + pby;
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break;
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default:
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// p2pkh
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signature[0] = 31 + pby;
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break;
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}
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}
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return result;
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}
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int cryptoMessageVerify(const CoinInfo *coin, const uint8_t *message,
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size_t message_len, const char *address,
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const uint8_t *signature) {
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// check for invalid signature prefix
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if (signature[0] < 27 || signature[0] > 43) {
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return 1;
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}
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uint8_t hash[HASHER_DIGEST_LENGTH];
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cryptoMessageHash(coin, message, message_len, hash);
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uint8_t recid = (signature[0] - 27) % 4;
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bool compressed = signature[0] >= 31;
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// check if signature verifies the digest and recover the public key
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uint8_t pubkey[65];
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if (ecdsa_recover_pub_from_sig(coin->curve->params, pubkey, signature + 1,
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hash, recid) != 0) {
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return 3;
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}
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// convert public key to compressed pubkey if necessary
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if (compressed) {
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pubkey[0] = 0x02 | (pubkey[64] & 1);
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}
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// check if the address is correct
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uint8_t addr_raw[MAX_ADDR_RAW_SIZE];
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uint8_t recovered_raw[MAX_ADDR_RAW_SIZE];
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// p2pkh
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if (signature[0] >= 27 && signature[0] <= 34) {
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size_t len;
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if (coin->cashaddr_prefix) {
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if (!cash_addr_decode(addr_raw, &len, coin->cashaddr_prefix, address)) {
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return 2;
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}
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} else {
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len = base58_decode_check(address, coin->curve->hasher_base58, addr_raw,
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MAX_ADDR_RAW_SIZE);
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}
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ecdsa_get_address_raw(pubkey, coin->address_type,
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coin->curve->hasher_pubkey, recovered_raw);
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if (memcmp(recovered_raw, addr_raw, len) != 0 ||
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len != address_prefix_bytes_len(coin->address_type) + 20) {
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return 2;
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}
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} else
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// segwit-in-p2sh
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if (signature[0] >= 35 && signature[0] <= 38) {
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size_t len = base58_decode_check(address, coin->curve->hasher_base58,
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addr_raw, MAX_ADDR_RAW_SIZE);
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ecdsa_get_address_segwit_p2sh_raw(pubkey, coin->address_type_p2sh,
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coin->curve->hasher_pubkey,
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recovered_raw);
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if (memcmp(recovered_raw, addr_raw, len) != 0 ||
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len != address_prefix_bytes_len(coin->address_type_p2sh) + 20) {
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return 2;
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}
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} else
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// segwit
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if (signature[0] >= 39 && signature[0] <= 42) {
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int witver;
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size_t len;
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if (!coin->bech32_prefix ||
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!segwit_addr_decode(&witver, recovered_raw, &len, coin->bech32_prefix,
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address)) {
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return 4;
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}
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ecdsa_get_pubkeyhash(pubkey, coin->curve->hasher_pubkey, addr_raw);
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if (memcmp(recovered_raw, addr_raw, len) != 0 || witver != 0 || len != 20) {
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return 2;
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}
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} else {
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return 4;
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}
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return 0;
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}
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/* ECIES disabled
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int cryptoMessageEncrypt(curve_point *pubkey, const uint8_t *msg, size_t
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msg_size, bool display_only, uint8_t *nonce, size_t *nonce_len, uint8_t
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*payload, size_t *payload_len, uint8_t *hmac, size_t *hmac_len, const uint8_t
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*privkey, const uint8_t *address_raw)
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{
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if (privkey && address_raw) { // signing == true
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HDNode node;
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payload[0] = display_only ? 0x81 : 0x01;
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uint32_t l = ser_length(msg_size, payload + 1);
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memcpy(payload + 1 + l, msg, msg_size);
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memcpy(payload + 1 + l + msg_size, address_raw, 21);
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hdnode_from_xprv(0, 0, 0, privkey, privkey, SECP256K1_NAME,
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&node); if (cryptoMessageSign(&node, msg, msg_size, payload + 1 + l + msg_size +
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21) != 0) { return 1;
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}
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*payload_len = 1 + l + msg_size + 21 + 65;
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} else {
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payload[0] = display_only ? 0x80 : 0x00;
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uint32_t l = ser_length(msg_size, payload + 1);
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memcpy(payload + 1 + l, msg, msg_size);
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*payload_len = 1 + l + msg_size;
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}
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// generate random nonce
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curve_point R;
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bignum256 k;
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if (generate_k_random(&secp256k1, &k) != 0) {
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return 2;
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}
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// compute k*G
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scalar_multiply(&secp256k1, &k, &R);
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nonce[0] = 0x02 | (R.y.val[0] & 0x01);
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bn_write_be(&R.x, nonce + 1);
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*nonce_len = 33;
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// compute shared secret
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point_multiply(&secp256k1, &k, pubkey, &R);
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uint8_t shared_secret[33];
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shared_secret[0] = 0x02 | (R.y.val[0] & 0x01);
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bn_write_be(&R.x, shared_secret + 1);
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// generate keying bytes
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uint8_t keying_bytes[80];
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uint8_t salt[22 + 33];
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memcpy(salt, "Bitcoin Secure Message", 22);
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memcpy(salt + 22, nonce, 33);
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pbkdf2_hmac_sha256(shared_secret, 33, salt, 22 + 33, 2048, keying_bytes,
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80);
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// encrypt payload
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aes_encrypt_ctx ctx;
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aes_encrypt_key256(keying_bytes, &ctx);
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aes_cfb_encrypt(payload, payload, *payload_len, keying_bytes + 64,
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&ctx);
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// compute hmac
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uint8_t out[32];
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hmac_sha256(keying_bytes + 32, 32, payload, *payload_len, out);
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memcpy(hmac, out, 8);
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*hmac_len = 8;
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return 0;
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}
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int cryptoMessageDecrypt(curve_point *nonce, uint8_t *payload, size_t
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payload_len, const uint8_t *hmac, size_t hmac_len, const uint8_t *privkey,
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uint8_t *msg, size_t *msg_len, bool *display_only, bool *signing, uint8_t
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*address_raw)
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{
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if (hmac_len != 8) {
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return 1;
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}
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// compute shared secret
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curve_point R;
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bignum256 k;
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bn_read_be(privkey, &k);
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point_multiply(&secp256k1, &k, nonce, &R);
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uint8_t shared_secret[33];
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shared_secret[0] = 0x02 | (R.y.val[0] & 0x01);
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bn_write_be(&R.x, shared_secret + 1);
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// generate keying bytes
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uint8_t keying_bytes[80];
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uint8_t salt[22 + 33];
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memcpy(salt, "Bitcoin Secure Message", 22);
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salt[22] = 0x02 | (nonce->y.val[0] & 0x01);
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bn_write_be(&(nonce->x), salt + 23);
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pbkdf2_hmac_sha256(shared_secret, 33, salt, 22 + 33, 2048, keying_bytes,
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80);
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// compute hmac
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uint8_t out[32];
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hmac_sha256(keying_bytes + 32, 32, payload, payload_len, out);
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if (memcmp(hmac, out, 8) != 0) {
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return 2;
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}
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// decrypt payload
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aes_encrypt_ctx ctx;
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aes_encrypt_key256(keying_bytes, &ctx);
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aes_cfb_decrypt(payload, payload, payload_len, keying_bytes + 64, &ctx);
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// check first byte
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if (payload[0] != 0x00 && payload[0] != 0x01 && payload[0] != 0x80 &&
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payload[0] != 0x81) { return 3;
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}
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*signing = payload[0] & 0x01;
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*display_only = payload[0] & 0x80;
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uint32_t l, o;
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l = deser_length(payload + 1, &o);
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if (*signing) {
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// FIXME: assumes a raw address is 21 bytes (also below).
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if (1 + l + o + 21 + 65 != payload_len) {
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return 4;
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}
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// FIXME: cryptoMessageVerify changed to take the address_type
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as a parameter. if (cryptoMessageVerify(payload + 1 + l, o, payload + 1 + l + o,
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payload + 1 + l + o + 21) != 0) { return 5;
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}
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memcpy(address_raw, payload + 1 + l + o, 21);
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} else {
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if (1 + l + o != payload_len) {
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return 4;
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}
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}
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memcpy(msg, payload + 1 + l, o);
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*msg_len = o;
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return 0;
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}
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*/
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const HDNode *cryptoMultisigPubkey(const CoinInfo *coin,
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const MultisigRedeemScriptType *multisig,
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uint32_t index) {
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const HDNodeType *node_ptr;
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const uint32_t *address_n;
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uint32_t address_n_count;
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if (multisig->nodes_count) { // use multisig->nodes
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if (index >= multisig->nodes_count) {
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return 0;
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}
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node_ptr = &(multisig->nodes[index]);
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address_n = multisig->address_n;
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address_n_count = multisig->address_n_count;
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} else if (multisig->pubkeys_count) { // use multisig->pubkeys
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if (index >= multisig->pubkeys_count) {
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return 0;
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}
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node_ptr = &(multisig->pubkeys[index].node);
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address_n = multisig->pubkeys[index].address_n;
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address_n_count = multisig->pubkeys[index].address_n_count;
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} else {
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return 0;
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}
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if (node_ptr->chain_code.size != 32) return 0;
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if (!node_ptr->has_public_key || node_ptr->public_key.size != 33) return 0;
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static HDNode node;
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if (!hdnode_from_xpub(node_ptr->depth, node_ptr->child_num,
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node_ptr->chain_code.bytes, node_ptr->public_key.bytes,
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coin->curve_name, &node)) {
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return 0;
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}
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layoutProgressUpdate(true);
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for (uint32_t i = 0; i < address_n_count; i++) {
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if (!hdnode_public_ckd(&node, address_n[i])) {
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return 0;
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}
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layoutProgressUpdate(true);
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}
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return &node;
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}
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uint32_t cryptoMultisigPubkeyCount(const MultisigRedeemScriptType *multisig) {
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return multisig->nodes_count ? multisig->nodes_count
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: multisig->pubkeys_count;
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}
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int cryptoMultisigPubkeyIndex(const CoinInfo *coin,
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const MultisigRedeemScriptType *multisig,
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const uint8_t *pubkey) {
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for (size_t i = 0; i < cryptoMultisigPubkeyCount(multisig); i++) {
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const HDNode *pubnode = cryptoMultisigPubkey(coin, multisig, i);
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if (pubnode && memcmp(pubnode->public_key, pubkey, 33) == 0) {
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return i;
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}
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}
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return -1;
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}
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int cryptoMultisigFingerprint(const MultisigRedeemScriptType *multisig,
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uint8_t *hash) {
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static const HDNodeType *pubnodes[15], *swap;
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const uint32_t n = cryptoMultisigPubkeyCount(multisig);
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if (n < 1 || n > 15) {
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return 0;
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}
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if (!multisig->has_m || multisig->m < 1 || multisig->m > 15) {
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return 0;
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}
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for (uint32_t i = 0; i < n; i++) {
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if (multisig->nodes_count) { // use multisig->nodes
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pubnodes[i] = &(multisig->nodes[i]);
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} else if (multisig->pubkeys_count) { // use multisig->pubkeys
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pubnodes[i] = &(multisig->pubkeys[i].node);
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} else {
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return 0;
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}
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}
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for (uint32_t i = 0; i < n; i++) {
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if (!pubnodes[i]->has_public_key || pubnodes[i]->public_key.size != 33)
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return 0;
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if (pubnodes[i]->chain_code.size != 32) return 0;
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}
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// minsort according to pubkey
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for (uint32_t i = 0; i < n - 1; i++) {
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for (uint32_t j = n - 1; j > i; j--) {
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if (memcmp(pubnodes[i]->public_key.bytes, pubnodes[j]->public_key.bytes,
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33) > 0) {
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swap = pubnodes[i];
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pubnodes[i] = pubnodes[j];
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pubnodes[j] = swap;
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}
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}
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}
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// hash sorted nodes
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SHA256_CTX ctx;
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sha256_Init(&ctx);
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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;
|
|
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;
|
|
}
|