mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-13 19:18:56 +00:00
190 lines
6.2 KiB
C
190 lines
6.2 KiB
C
/* Copyright (c) 2017 Jochen Hoenicke
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* based on code Copyright (c) 2017 Peter Wuille
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* 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 in
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* 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 OR
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* 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 THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cash_addr.h"
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#define MAX_CASHADDR_SIZE 129
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#define MAX_BASE32_SIZE 104
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#define MAX_DATA_SIZE 65
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#define MAX_HRP_SIZE 20
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#define CHECKSUM_SIZE 8
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uint64_t cashaddr_polymod_step(uint64_t pre) {
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uint8_t b = pre >> 35;
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return ((pre & 0x7FFFFFFFFULL) << 5) ^ (-((b >> 0) & 1) & 0x98f2bc8e61ULL) ^
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(-((b >> 1) & 1) & 0x79b76d99e2ULL) ^
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(-((b >> 2) & 1) & 0xf33e5fb3c4ULL) ^
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(-((b >> 3) & 1) & 0xae2eabe2a8ULL) ^
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(-((b >> 4) & 1) & 0x1e4f43e470ULL);
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}
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static const char* charset = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
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static const int8_t charset_rev[128] = {
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 15, -1, 10, 17, 21, 20, 26, 30, 7,
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5, -1, -1, -1, -1, -1, -1, -1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22,
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31, 27, 19, -1, 1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1,
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-1, -1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1, 1, 0,
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3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1};
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int cash_encode(char* output, const char* hrp, const uint8_t* data,
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size_t data_len) {
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uint64_t chk = 1;
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size_t i = 0;
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while (hrp[i] != 0) {
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int ch = hrp[i];
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if (ch < 33 || ch > 126) {
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return 0;
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}
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*(output++) = ch;
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chk = cashaddr_polymod_step(chk) ^ (ch & 0x1f);
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++i;
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}
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if (i + 1 + data_len + CHECKSUM_SIZE > MAX_CASHADDR_SIZE) {
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return 0;
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}
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chk = cashaddr_polymod_step(chk);
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*(output++) = ':';
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for (i = 0; i < data_len; ++i) {
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if (*data >> 5) return 0;
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chk = cashaddr_polymod_step(chk) ^ (*data);
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*(output++) = charset[*(data++)];
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}
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for (i = 0; i < CHECKSUM_SIZE; ++i) {
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chk = cashaddr_polymod_step(chk);
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}
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chk ^= 1;
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for (i = 0; i < CHECKSUM_SIZE; ++i) {
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*(output++) = charset[(chk >> ((CHECKSUM_SIZE - 1 - i) * 5)) & 0x1f];
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}
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*output = 0;
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return 1;
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}
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int cash_decode(char* hrp, uint8_t* data, size_t* data_len, const char* input) {
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uint64_t chk = 1;
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size_t i = 0;
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size_t input_len = strlen(input);
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size_t hrp_len = 0;
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int have_lower = 0, have_upper = 0;
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if (input_len < CHECKSUM_SIZE || input_len > MAX_CASHADDR_SIZE) {
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return 0;
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}
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*data_len = 0;
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while (*data_len < input_len && input[(input_len - 1) - *data_len] != ':') {
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++(*data_len);
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}
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hrp_len = input_len - (1 + *data_len);
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if (1 + *data_len >= input_len || hrp_len > MAX_HRP_SIZE ||
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*data_len < CHECKSUM_SIZE ||
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*data_len > CHECKSUM_SIZE + MAX_BASE32_SIZE) {
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return 0;
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}
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// subtract checksum
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*(data_len) -= CHECKSUM_SIZE;
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for (i = 0; i < hrp_len; ++i) {
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int ch = input[i];
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if (ch < 33 || ch > 126) {
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return 0;
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}
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if (ch >= 'a' && ch <= 'z') {
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have_lower = 1;
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} else if (ch >= 'A' && ch <= 'Z') {
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have_upper = 1;
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ch = (ch - 'A') + 'a';
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}
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hrp[i] = ch;
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chk = cashaddr_polymod_step(chk) ^ (ch & 0x1f);
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}
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hrp[i] = 0;
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chk = cashaddr_polymod_step(chk);
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++i;
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while (i < input_len) {
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int v = (input[i] & 0x80) ? -1 : charset_rev[(int)input[i]];
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if (input[i] >= 'a' && input[i] <= 'z') have_lower = 1;
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if (input[i] >= 'A' && input[i] <= 'Z') have_upper = 1;
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if (v == -1) {
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return 0;
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}
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chk = cashaddr_polymod_step(chk) ^ v;
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if (i + CHECKSUM_SIZE < input_len) {
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data[i - (1 + hrp_len)] = v;
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}
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++i;
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}
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if (have_lower && have_upper) {
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return 0;
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}
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return chk == 1;
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}
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static int convert_bits(uint8_t* out, size_t* outlen, int outbits,
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const uint8_t* in, size_t inlen, int inbits, int pad) {
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uint32_t val = 0;
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int bits = 0;
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uint32_t maxv = (((uint32_t)1) << outbits) - 1;
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while (inlen--) {
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val = (val << inbits) | *(in++);
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bits += inbits;
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while (bits >= outbits) {
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bits -= outbits;
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out[(*outlen)++] = (val >> bits) & maxv;
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}
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}
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if (pad) {
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if (bits) {
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out[(*outlen)++] = (val << (outbits - bits)) & maxv;
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}
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} else if (((val << (outbits - bits)) & maxv) || bits >= inbits) {
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return 0;
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}
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return 1;
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}
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int cash_addr_encode(char* output, const char* hrp, const uint8_t* data,
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size_t data_len) {
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uint8_t base32[MAX_BASE32_SIZE] = {0};
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size_t base32len = 0;
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if (data_len < 2 || data_len > MAX_DATA_SIZE) return 0;
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convert_bits(base32, &base32len, 5, data, data_len, 8, 1);
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return cash_encode(output, hrp, base32, base32len);
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}
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int cash_addr_decode(uint8_t* witdata, size_t* witdata_len, const char* hrp,
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const char* addr) {
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uint8_t data[MAX_BASE32_SIZE] = {0};
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char hrp_actual[MAX_HRP_SIZE + 1] = {0};
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size_t data_len = 0;
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if (!cash_decode(hrp_actual, data, &data_len, addr)) return 0;
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if (data_len == 0 || data_len > MAX_BASE32_SIZE) return 0;
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if (strncmp(hrp, hrp_actual, MAX_HRP_SIZE + 1) != 0) return 0;
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*witdata_len = 0;
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if (!convert_bits(witdata, witdata_len, 8, data, data_len, 5, 0)) return 0;
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if (*witdata_len < 2 || *witdata_len > MAX_DATA_SIZE) return 0;
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return 1;
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}
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