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210 lines
7.4 KiB
210 lines
7.4 KiB
/* Copyright (c) 2017, 2021 Pieter 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 <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include "segwit_addr.h"
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static uint32_t bech32_polymod_step(uint32_t pre) {
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uint8_t b = pre >> 25;
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return ((pre & 0x1FFFFFF) << 5) ^
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(-((b >> 0) & 1) & 0x3b6a57b2UL) ^
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(-((b >> 1) & 1) & 0x26508e6dUL) ^
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(-((b >> 2) & 1) & 0x1ea119faUL) ^
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(-((b >> 3) & 1) & 0x3d4233ddUL) ^
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(-((b >> 4) & 1) & 0x2a1462b3UL);
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}
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static uint32_t bech32_final_constant(bech32_encoding enc) {
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if (enc == BECH32_ENCODING_BECH32) return 1;
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if (enc == BECH32_ENCODING_BECH32M) return 0x2bc830a3;
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return 0;
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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,
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-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,
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15, -1, 10, 17, 21, 20, 26, 30, 7, 5, -1, -1, -1, -1, -1, -1,
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-1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1,
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1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1,
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-1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1,
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1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1
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};
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int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t data_len, bech32_encoding enc) {
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uint32_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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if (ch >= 'A' && ch <= 'Z') return 0;
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chk = bech32_polymod_step(chk) ^ (ch >> 5);
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++i;
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}
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if (i + 7 + data_len > 90) return 0;
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chk = bech32_polymod_step(chk);
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while (*hrp != 0) {
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chk = bech32_polymod_step(chk) ^ (*hrp & 0x1f);
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*(output++) = *(hrp++);
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}
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*(output++) = '1';
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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 = bech32_polymod_step(chk) ^ (*data);
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*(output++) = charset[*(data++)];
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}
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for (i = 0; i < 6; ++i) {
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chk = bech32_polymod_step(chk);
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}
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chk ^= bech32_final_constant(enc);
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for (i = 0; i < 6; ++i) {
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*(output++) = charset[(chk >> ((5 - 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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bech32_encoding bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input) {
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uint32_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 < 8) {
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return BECH32_ENCODING_NONE;
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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] != '1') {
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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 || *data_len < 6 || hrp_len > BECH32_MAX_HRP_LEN) {
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return BECH32_ENCODING_NONE;
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}
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*(data_len) -= 6;
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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 BECH32_ENCODING_NONE;
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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 = bech32_polymod_step(chk) ^ (ch >> 5);
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}
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hrp[i] = 0;
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chk = bech32_polymod_step(chk);
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for (i = 0; i < hrp_len; ++i) {
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chk = bech32_polymod_step(chk) ^ (input[i] & 0x1f);
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}
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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 BECH32_ENCODING_NONE;
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}
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chk = bech32_polymod_step(chk) ^ v;
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if (i + 6 < 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 BECH32_ENCODING_NONE;
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}
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if (chk == bech32_final_constant(BECH32_ENCODING_BECH32)) {
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return BECH32_ENCODING_BECH32;
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} else if (chk == bech32_final_constant(BECH32_ENCODING_BECH32M)) {
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return BECH32_ENCODING_BECH32M;
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} else {
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return BECH32_ENCODING_NONE;
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}
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}
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static int convert_bits(uint8_t* out, size_t* outlen, int outbits, 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 segwit_addr_encode(char *output, const char *hrp, int witver, const uint8_t *witprog, size_t witprog_len) {
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uint8_t data[65] = {0};
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size_t datalen = 0;
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bech32_encoding enc = BECH32_ENCODING_BECH32;
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if (witver > 16) return 0;
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if (witver == 0 && witprog_len != 20 && witprog_len != 32) return 0;
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if (witprog_len < 2 || witprog_len > 40) return 0;
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if (witver > 0) enc = BECH32_ENCODING_BECH32M;
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data[0] = witver;
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convert_bits(data + 1, &datalen, 5, witprog, witprog_len, 8, 1);
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++datalen;
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return bech32_encode(output, hrp, data, datalen, enc);
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}
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int segwit_addr_decode(int* witver, uint8_t* witdata, size_t* witdata_len, const char* hrp, const char* addr) {
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uint8_t data[84] = {0};
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char hrp_actual[84] = {0};
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size_t data_len = 0;
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if (strlen(addr) > 90) return 0;
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bech32_encoding enc = bech32_decode(hrp_actual, data, &data_len, addr);
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if (enc == BECH32_ENCODING_NONE) return 0;
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if (data_len == 0 || data_len > 65) return 0;
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if (strncmp(hrp, hrp_actual, 84) != 0) return 0;
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if (data[0] > 16) return 0;
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if (data[0] == 0 && enc != BECH32_ENCODING_BECH32) return 0;
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if (data[0] > 0 && enc != BECH32_ENCODING_BECH32M) return 0;
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*witdata_len = 0;
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if (!convert_bits(witdata, witdata_len, 8, data + 1, data_len - 1, 5, 0)) return 0;
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if (*witdata_len < 2 || *witdata_len > 40) return 0;
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if (data[0] == 0 && *witdata_len != 20 && *witdata_len != 32) return 0;
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*witver = data[0];
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return 1;
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}
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