mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-24 16:38:15 +00:00
210 lines
7.4 KiB
C
210 lines
7.4 KiB
C
/* Copyright (c) 2017, 2021 Pieter Wuille
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include "segwit_addr.h"
|
|
|
|
static uint32_t bech32_polymod_step(uint32_t pre) {
|
|
uint8_t b = pre >> 25;
|
|
return ((pre & 0x1FFFFFF) << 5) ^
|
|
(-((b >> 0) & 1) & 0x3b6a57b2UL) ^
|
|
(-((b >> 1) & 1) & 0x26508e6dUL) ^
|
|
(-((b >> 2) & 1) & 0x1ea119faUL) ^
|
|
(-((b >> 3) & 1) & 0x3d4233ddUL) ^
|
|
(-((b >> 4) & 1) & 0x2a1462b3UL);
|
|
}
|
|
|
|
static uint32_t bech32_final_constant(bech32_encoding enc) {
|
|
if (enc == BECH32_ENCODING_BECH32) return 1;
|
|
if (enc == BECH32_ENCODING_BECH32M) return 0x2bc830a3;
|
|
return 0;
|
|
}
|
|
|
|
static const char* charset = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
|
|
|
|
static const int8_t charset_rev[128] = {
|
|
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
|
|
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
|
|
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
|
|
15, -1, 10, 17, 21, 20, 26, 30, 7, 5, -1, -1, -1, -1, -1, -1,
|
|
-1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1,
|
|
1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1,
|
|
-1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1,
|
|
1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1
|
|
};
|
|
|
|
int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t data_len, bech32_encoding enc) {
|
|
uint32_t chk = 1;
|
|
size_t i = 0;
|
|
while (hrp[i] != 0) {
|
|
int ch = hrp[i];
|
|
if (ch < 33 || ch > 126) {
|
|
return 0;
|
|
}
|
|
|
|
if (ch >= 'A' && ch <= 'Z') return 0;
|
|
chk = bech32_polymod_step(chk) ^ (ch >> 5);
|
|
++i;
|
|
}
|
|
if (i + 7 + data_len > 90) return 0;
|
|
chk = bech32_polymod_step(chk);
|
|
while (*hrp != 0) {
|
|
chk = bech32_polymod_step(chk) ^ (*hrp & 0x1f);
|
|
*(output++) = *(hrp++);
|
|
}
|
|
*(output++) = '1';
|
|
for (i = 0; i < data_len; ++i) {
|
|
if (*data >> 5) return 0;
|
|
chk = bech32_polymod_step(chk) ^ (*data);
|
|
*(output++) = charset[*(data++)];
|
|
}
|
|
for (i = 0; i < 6; ++i) {
|
|
chk = bech32_polymod_step(chk);
|
|
}
|
|
chk ^= bech32_final_constant(enc);
|
|
for (i = 0; i < 6; ++i) {
|
|
*(output++) = charset[(chk >> ((5 - i) * 5)) & 0x1f];
|
|
}
|
|
*output = 0;
|
|
return 1;
|
|
}
|
|
|
|
bech32_encoding bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input) {
|
|
uint32_t chk = 1;
|
|
size_t i = 0;
|
|
size_t input_len = strlen(input);
|
|
size_t hrp_len = 0;
|
|
int have_lower = 0, have_upper = 0;
|
|
if (input_len < 8) {
|
|
return BECH32_ENCODING_NONE;
|
|
}
|
|
*data_len = 0;
|
|
while (*data_len < input_len && input[(input_len - 1) - *data_len] != '1') {
|
|
++(*data_len);
|
|
}
|
|
hrp_len = input_len - (1 + *data_len);
|
|
if (1 + *data_len >= input_len || *data_len < 6 || hrp_len > BECH32_MAX_HRP_LEN) {
|
|
return BECH32_ENCODING_NONE;
|
|
}
|
|
*(data_len) -= 6;
|
|
for (i = 0; i < hrp_len; ++i) {
|
|
int ch = input[i];
|
|
if (ch < 33 || ch > 126) {
|
|
return BECH32_ENCODING_NONE;
|
|
}
|
|
if (ch >= 'a' && ch <= 'z') {
|
|
have_lower = 1;
|
|
} else if (ch >= 'A' && ch <= 'Z') {
|
|
have_upper = 1;
|
|
ch = (ch - 'A') + 'a';
|
|
}
|
|
hrp[i] = ch;
|
|
chk = bech32_polymod_step(chk) ^ (ch >> 5);
|
|
}
|
|
hrp[i] = 0;
|
|
chk = bech32_polymod_step(chk);
|
|
for (i = 0; i < hrp_len; ++i) {
|
|
chk = bech32_polymod_step(chk) ^ (input[i] & 0x1f);
|
|
}
|
|
++i;
|
|
while (i < input_len) {
|
|
int v = (input[i] & 0x80) ? -1 : charset_rev[(int)input[i]];
|
|
if (input[i] >= 'a' && input[i] <= 'z') have_lower = 1;
|
|
if (input[i] >= 'A' && input[i] <= 'Z') have_upper = 1;
|
|
if (v == -1) {
|
|
return BECH32_ENCODING_NONE;
|
|
}
|
|
chk = bech32_polymod_step(chk) ^ v;
|
|
if (i + 6 < input_len) {
|
|
data[i - (1 + hrp_len)] = v;
|
|
}
|
|
++i;
|
|
}
|
|
if (have_lower && have_upper) {
|
|
return BECH32_ENCODING_NONE;
|
|
}
|
|
if (chk == bech32_final_constant(BECH32_ENCODING_BECH32)) {
|
|
return BECH32_ENCODING_BECH32;
|
|
} else if (chk == bech32_final_constant(BECH32_ENCODING_BECH32M)) {
|
|
return BECH32_ENCODING_BECH32M;
|
|
} else {
|
|
return BECH32_ENCODING_NONE;
|
|
}
|
|
}
|
|
|
|
static int convert_bits(uint8_t* out, size_t* outlen, int outbits, const uint8_t* in, size_t inlen, int inbits, int pad) {
|
|
uint32_t val = 0;
|
|
int bits = 0;
|
|
uint32_t maxv = (((uint32_t)1) << outbits) - 1;
|
|
while (inlen--) {
|
|
val = (val << inbits) | *(in++);
|
|
bits += inbits;
|
|
while (bits >= outbits) {
|
|
bits -= outbits;
|
|
out[(*outlen)++] = (val >> bits) & maxv;
|
|
}
|
|
}
|
|
if (pad) {
|
|
if (bits) {
|
|
out[(*outlen)++] = (val << (outbits - bits)) & maxv;
|
|
}
|
|
} else if (((val << (outbits - bits)) & maxv) || bits >= inbits) {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int segwit_addr_encode(char *output, const char *hrp, int witver, const uint8_t *witprog, size_t witprog_len) {
|
|
uint8_t data[65] = {0};
|
|
size_t datalen = 0;
|
|
bech32_encoding enc = BECH32_ENCODING_BECH32;
|
|
if (witver > 16) return 0;
|
|
if (witver == 0 && witprog_len != 20 && witprog_len != 32) return 0;
|
|
if (witprog_len < 2 || witprog_len > 40) return 0;
|
|
if (witver > 0) enc = BECH32_ENCODING_BECH32M;
|
|
data[0] = witver;
|
|
convert_bits(data + 1, &datalen, 5, witprog, witprog_len, 8, 1);
|
|
++datalen;
|
|
return bech32_encode(output, hrp, data, datalen, enc);
|
|
}
|
|
|
|
int segwit_addr_decode(int* witver, uint8_t* witdata, size_t* witdata_len, const char* hrp, const char* addr) {
|
|
uint8_t data[84] = {0};
|
|
char hrp_actual[84] = {0};
|
|
size_t data_len = 0;
|
|
if (strlen(addr) > 90) return 0;
|
|
bech32_encoding enc = bech32_decode(hrp_actual, data, &data_len, addr);
|
|
if (enc == BECH32_ENCODING_NONE) return 0;
|
|
if (data_len == 0 || data_len > 65) return 0;
|
|
if (strncmp(hrp, hrp_actual, 84) != 0) return 0;
|
|
if (data[0] > 16) return 0;
|
|
if (data[0] == 0 && enc != BECH32_ENCODING_BECH32) return 0;
|
|
if (data[0] > 0 && enc != BECH32_ENCODING_BECH32M) return 0;
|
|
*witdata_len = 0;
|
|
if (!convert_bits(witdata, witdata_len, 8, data + 1, data_len - 1, 5, 0)) return 0;
|
|
if (*witdata_len < 2 || *witdata_len > 40) return 0;
|
|
if (data[0] == 0 && *witdata_len != 20 && *witdata_len != 32) return 0;
|
|
*witver = data[0];
|
|
return 1;
|
|
}
|