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https://github.com/trezor/trezor-firmware.git
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290 lines
8.3 KiB
C
290 lines
8.3 KiB
C
// Copyright (c) 2014-2018, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote
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// developers
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#include "base58.h"
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#include <assert.h>
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#include <stdbool.h>
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#include <string.h>
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#include <sys/types.h>
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#include "../base58.h"
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#include "../byte_order.h"
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#include "int-util.h"
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#include "sha2.h"
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const size_t alphabet_size = 58; // sizeof(b58digits_ordered) - 1;
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const size_t full_encoded_block_size = 11;
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const size_t encoded_block_sizes[] = {
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0, 2, 3, 5, 6, 7, 9, 10, full_encoded_block_size};
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const size_t full_block_size =
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sizeof(encoded_block_sizes) / sizeof(encoded_block_sizes[0]) - 1;
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const size_t addr_checksum_size = 4;
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const size_t max_bin_data_size = 72;
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const int decoded_block_sizes[] = {0, -1, 1, 2, -1, 3, 4, 5, -1, 6, 7, 8};
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#define reverse_alphabet(letter) ((int8_t)b58digits_map[(int)letter])
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uint64_t uint_8be_to_64(const uint8_t *data, size_t size) {
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assert(1 <= size && size <= sizeof(uint64_t));
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uint64_t res = 0;
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switch (9 - size) {
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case 1:
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res |= *data++; /* FALLTHRU */
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case 2:
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res <<= 8;
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res |= *data++; /* FALLTHRU */
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case 3:
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res <<= 8;
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res |= *data++; /* FALLTHRU */
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case 4:
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res <<= 8;
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res |= *data++; /* FALLTHRU */
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case 5:
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res <<= 8;
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res |= *data++; /* FALLTHRU */
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case 6:
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res <<= 8;
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res |= *data++; /* FALLTHRU */
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case 7:
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res <<= 8;
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res |= *data++; /* FALLTHRU */
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case 8:
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res <<= 8;
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res |= *data;
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break;
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default:
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assert(false);
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}
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return res;
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}
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void uint_64_to_8be(uint64_t num, size_t size, uint8_t *data) {
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assert(1 <= size && size <= sizeof(uint64_t));
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#if BYTE_ORDER == LITTLE_ENDIAN
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uint64_t num_be = SWAP64(num);
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#else
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uint64_t num_be = num;
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#endif
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memcpy(data, (uint8_t *)(&num_be) + sizeof(uint64_t) - size, size);
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}
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void encode_block(const char *block, size_t size, char *res) {
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assert(1 <= size && size <= full_block_size);
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uint64_t num = uint_8be_to_64((uint8_t *)(block), size);
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int i = ((int)(encoded_block_sizes[size])) - 1;
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while (0 <= i) {
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uint64_t remainder = num % alphabet_size;
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num /= alphabet_size;
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res[i] = b58digits_ordered[remainder];
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--i;
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}
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}
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bool decode_block(const char *block, size_t size, char *res) {
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assert(1 <= size && size <= full_encoded_block_size);
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int res_size = decoded_block_sizes[size];
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if (res_size <= 0) {
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return false; // Invalid block size
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}
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uint64_t res_num = 0;
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uint64_t order = 1;
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for (size_t i = size - 1; i < size; --i) {
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if (block[i] & 0x80) {
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return false; // Invalid symbol
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}
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int digit = reverse_alphabet(block[i]);
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if (digit < 0) {
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return false; // Invalid symbol
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}
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uint64_t product_hi = 0;
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uint64_t tmp = res_num + mul128(order, (uint64_t)digit, &product_hi);
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if (tmp < res_num || 0 != product_hi) {
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return false; // Overflow
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}
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res_num = tmp;
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// The original code comment for the order multiplication says
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// "Never overflows, 58^10 < 2^64"
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// This is incorrect since it overflows on the 11th iteration
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// However, there is no negative impact since the result is unused
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order *= alphabet_size;
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}
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if ((size_t)res_size < full_block_size &&
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(UINT64_C(1) << (8 * res_size)) <= res_num)
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return false; // Overflow
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uint_64_to_8be(res_num, res_size, (uint8_t *)(res));
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return true;
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}
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bool xmr_base58_encode(char *b58, size_t *b58sz, const void *data,
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size_t binsz) {
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if (binsz == 0) {
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if (b58sz) {
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*b58sz = 0;
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}
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return true;
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}
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const char *data_bin = data;
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size_t full_block_count = binsz / full_block_size;
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size_t last_block_size = binsz % full_block_size;
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size_t res_size = full_block_count * full_encoded_block_size +
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encoded_block_sizes[last_block_size];
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if (b58sz) {
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if (res_size > *b58sz) {
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return false;
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}
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*b58sz = res_size;
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}
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for (size_t i = 0; i < full_block_count; ++i) {
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encode_block(data_bin + i * full_block_size, full_block_size,
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b58 + i * full_encoded_block_size);
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}
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if (0 < last_block_size) {
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encode_block(data_bin + full_block_count * full_block_size, last_block_size,
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b58 + full_block_count * full_encoded_block_size);
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}
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return true;
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}
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bool xmr_base58_decode(const char *b58, size_t b58sz, void *data,
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size_t *binsz) {
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if (b58sz == 0) {
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*binsz = 0;
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return true;
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}
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size_t full_block_count = b58sz / full_encoded_block_size;
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size_t last_block_size = b58sz % full_encoded_block_size;
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int last_block_decoded_size = decoded_block_sizes[last_block_size];
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if (last_block_decoded_size < 0) {
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*binsz = 0;
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return false; // Invalid enc length
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}
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size_t data_size =
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full_block_count * full_block_size + last_block_decoded_size;
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if (*binsz < data_size) {
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*binsz = 0;
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return false;
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}
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char *data_bin = data;
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for (size_t i = 0; i < full_block_count; ++i) {
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if (!decode_block(b58 + i * full_encoded_block_size,
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full_encoded_block_size,
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data_bin + i * full_block_size)) {
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*binsz = 0;
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return false;
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}
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}
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if (0 < last_block_size) {
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if (!decode_block(b58 + full_block_count * full_encoded_block_size,
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last_block_size,
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data_bin + full_block_count * full_block_size)) {
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*binsz = 0;
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return false;
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}
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}
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*binsz = data_size;
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return true;
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}
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int xmr_base58_addr_encode_check(uint64_t tag, const uint8_t *data,
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size_t binsz, char *b58, size_t b58sz) {
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if (binsz > max_bin_data_size || tag > 127) { // tag varint
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return false;
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}
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size_t b58size = b58sz;
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uint8_t buf[(binsz + 1) + HASHER_DIGEST_LENGTH];
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memset(buf, 0, sizeof(buf));
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uint8_t *hash = buf + binsz + 1;
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buf[0] = (uint8_t)tag;
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memcpy(buf + 1, data, binsz);
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hasher_Raw(HASHER_SHA3K, buf, binsz + 1, hash);
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bool r =
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xmr_base58_encode(b58, &b58size, buf, binsz + 1 + addr_checksum_size);
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return (int)(!r ? 0 : b58size);
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}
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int xmr_base58_addr_decode_check(const char *addr, size_t sz, uint64_t *tag,
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void *data, size_t datalen) {
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size_t buflen = 1 + max_bin_data_size + addr_checksum_size;
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uint8_t buf[buflen];
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memset(buf, 0, sizeof(buf));
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uint8_t hash[HASHER_DIGEST_LENGTH] = {0};
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if (!xmr_base58_decode(addr, sz, buf, &buflen)) {
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return 0;
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}
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if (buflen <= addr_checksum_size + 1) {
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return 0;
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}
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size_t res_size = buflen - addr_checksum_size - 1;
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if (datalen < res_size) {
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return 0;
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}
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hasher_Raw(HASHER_SHA3K, buf, buflen - addr_checksum_size, hash);
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if (memcmp(hash, buf + buflen - addr_checksum_size, addr_checksum_size) !=
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0) {
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return 0;
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}
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*tag = buf[0];
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if (*tag > 127) {
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return false; // varint
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}
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memcpy(data, buf + 1, res_size);
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return (int)res_size;
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}
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