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@ -1,4 +1,4 @@
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/* Copyright (c) 2017 Pieter Wuille
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/* 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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@ -24,7 +24,7 @@
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#include "segwit_addr.h"
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uint32_t bech32_polymod_step(uint32_t pre) {
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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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@ -34,6 +34,12 @@ uint32_t bech32_polymod_step(uint32_t pre) {
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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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@ -47,7 +53,7 @@ static const int8_t charset_rev[128] = {
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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) {
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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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@ -75,7 +81,7 @@ int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t dat
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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 ^= 1;
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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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@ -83,14 +89,14 @@ int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t dat
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return 1;
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}
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int bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input) {
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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 || input_len > 90) {
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return 0;
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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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@ -98,13 +104,13 @@ int bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input)
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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) {
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return 0;
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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 0;
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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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@ -126,7 +132,7 @@ int bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input)
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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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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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@ -135,9 +141,15 @@ int bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input)
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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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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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return chk == 1;
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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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@ -165,23 +177,28 @@ static int convert_bits(uint8_t* out, size_t* outlen, int outbits, const uint8_t
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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);
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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 (!bech32_decode(hrp_actual, data, &data_len, addr)) 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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