mirror of
https://github.com/LBRYFoundation/pool.git
synced 2025-08-23 17:37:25 +00:00
99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
/*
|
|
* Copyright 2012 Luke Dashjr
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the standard MIT license. See COPYING for more details.
|
|
*/
|
|
|
|
#include <arpa/inet.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
static const int8_t b58digits[] = {
|
|
-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,
|
|
};
|
|
|
|
bool _blkmk_b58tobin(void *bin, size_t binsz, const char *b58, size_t b58sz) {
|
|
const unsigned char *b58u = (const unsigned char*)b58;
|
|
unsigned char *binu = (unsigned char *)bin;
|
|
size_t outisz = (binsz + 3) / 4;
|
|
uint32_t outi[outisz];
|
|
uint64_t t;
|
|
uint32_t c;
|
|
size_t i, j;
|
|
uint8_t bytesleft = binsz % 4;
|
|
uint32_t zeromask = ~((1 << ((bytesleft) * 8)) - 1);
|
|
|
|
if (!b58sz)
|
|
b58sz = strlen(b58);
|
|
|
|
memset(outi, 0, outisz * sizeof(*outi));
|
|
|
|
for (i = 0; i < b58sz; ++i)
|
|
{
|
|
if (b58u[i] & 0x80)
|
|
// High-bit set on invalid digit
|
|
return false;
|
|
if (b58digits[b58u[i]] == -1)
|
|
// Invalid base58 digit
|
|
return false;
|
|
c = b58digits[b58u[i]];
|
|
for (j = outisz; j--; )
|
|
{
|
|
t = ((uint64_t)outi[j]) * 58 + c;
|
|
c = (t & 0x3f00000000) >> 32;
|
|
outi[j] = t & 0xffffffff;
|
|
}
|
|
if (c)
|
|
// Output number too big (carry to the next int32)
|
|
return false;
|
|
if (outi[0] & zeromask)
|
|
// Output number too big (last int32 filled too far)
|
|
return false;
|
|
}
|
|
|
|
j = 0;
|
|
switch (bytesleft) {
|
|
case 3:
|
|
*(binu++) = (outi[0] & 0xff0000) >> 16;
|
|
case 2:
|
|
*(binu++) = (outi[0] & 0xff00) >> 8;
|
|
case 1:
|
|
*(binu++) = (outi[0] & 0xff);
|
|
++j;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
for (; j < outisz; ++j)
|
|
{
|
|
*((uint32_t*)binu) = htonl(outi[j]);
|
|
binu += sizeof(uint32_t);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool base58_decode(const char *input, char *output)
|
|
{
|
|
unsigned char output_bin[25];
|
|
|
|
bool b = _blkmk_b58tobin(output_bin, sizeof(output_bin), input, 0);
|
|
if(!b) return false;
|
|
|
|
output[0] = 0;
|
|
for(int i=1; i < 21; i++)
|
|
sprintf(output+strlen(output), "%02x", output_bin[i]);
|
|
|
|
return true;
|
|
}
|
|
|