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Base58.cpp
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Base58.cpp
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/*
* This file is part of the VanitySearch distribution (https://github.com/JeanLucPons/VanitySearch).
* Copyright (c) 2019 Jean Luc PONS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Base58.h"
#include <algorithm>
#include <string.h>
#include <cstdint>
#include <vector>
/** All alphanumeric characters except for "0", "I", "O", and "l" */
static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
static const int8_t b58digits_map[] = {
-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,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8,-1,-1,-1,-1,-1,-1,
-1, 9,10,11,12,13,14,15, 16,-1,17,18,19,20,21,-1,
22,23,24,25,26,27,28,29, 30,31,32,-1,-1,-1,-1,-1,
-1,33,34,35,36,37,38,39, 40,41,42,43,-1,44,45,46,
47,48,49,50,51,52,53,54, 55,56,57,-1,-1,-1,-1,-1,
};
int numBase58Chars(const char* psz) {
std::vector<int> lengths;
int len = 0;
bool ignore = false;
size_t pszl = strlen(psz);
for (size_t i = 0; i < pszl; ++i) {
if (psz[i] & 0x80) return -1;
char c = psz[i];
bool first = i == 0;
if (c == '[' && !first && psz[i-1] != '\\') {
ignore = true;
continue;
}
else if (c == ']' && !first && psz[i-1] != '\\') {
ignore = false;
++len;
continue;
}
else if (c == '|' && !first && psz[i-1] != '\\') {
lengths.push_back(len);
len = 0;
continue;
}
else if ((c == '*' || c == '?') && !first && psz[i-1] != '\\') {
--len;
continue;
}
else if (!ignore && b58digits_map[c] != -1) {
++len;
continue;
}
}
lengths.push_back(len);
int min = lengths[0];
for (int i = 1; i < lengths.size(); ++i) {
if (min > lengths[i]) min = lengths[i];
}
return min;
}
bool DecodeBase58(const char* psz, std::vector<uint8_t> &vch) {
uint8_t digits[256];
// Skip and count leading '1'
int zeroes = 0;
while (*psz == '1') {
zeroes++;
psz++;
}
int length = (int)strlen(psz);
// Process the characters
int digitslen = 1;
digits[0] = 0;
for (int i = 0; i < length; i++) {
// Decode base58 character
if (psz[i] & 0x80)
return false;
int8_t c = b58digits_map[psz[i]];
if (c < 0)
return false;
uint32_t carry = (uint32_t)c;
for (int j = 0; j < digitslen; j++) {
carry += (uint32_t)(digits[j]) * 58;
digits[j] = (uint8_t)(carry % 256);
carry /= 256;
}
while (carry > 0) {
digits[digitslen++] = (uint8_t)(carry % 256);
carry /= 256;
}
}
vch.clear();
vch.reserve(zeroes + digitslen);
// zeros
for (int i = 0; i < zeroes; i++)
vch.push_back(0);
// reverse
for (int i = 0; i < digitslen; i++)
vch.push_back(digits[digitslen - 1 - i]);
return true;
}
std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend) {
std::string ret;
unsigned char digits[256];
// Skip leading zeroes
while (pbegin != pend && *pbegin == 0) {
ret.push_back('1');
pbegin++;
}
int length = (int)(pend - pbegin);
int digitslen = 1;
digits[0]=0;
for(int i = 0; i < length; i++) {
uint32_t carry = pbegin[i];
for(int j = 0; j < digitslen; j++) {
carry += (uint32_t)(digits[j]) << 8;
digits[j] = (unsigned char)(carry % 58);
carry /= 58;
}
while(carry > 0) {
digits[digitslen++] = (unsigned char)(carry % 58);
carry /= 58;
}
}
// reverse
for(int i = 0; i < digitslen; i++)
ret.push_back(pszBase58[digits[digitslen - 1 - i]]);
return ret;
}
std::string EncodeBase58(const std::vector<unsigned char>& vch)
{
return EncodeBase58(vch.data(), vch.data() + vch.size());
}
bool DecodeBase58(const std::string& str, std::vector<unsigned char>& vchRet)
{
return DecodeBase58(str.c_str(), vchRet);
}