forked from Ocean/datum_gateway
Import base58.c from libbase58
Co-authored-by: Huang Le <4tarhl@gmail.com> Co-authored-by: Aaron Voisine <voisine@gmail.com>
This commit is contained in:
Luke Dashjr
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205
src/thirdparty_base58.c
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205
src/thirdparty_base58.c
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/*
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* Copyright 2012-2014 Luke Dashjr
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the standard MIT license. See COPYING for more details.
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*/
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#ifndef WIN32
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#include <arpa/inet.h>
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#else
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#include <winsock2.h>
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#endif
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include "libbase58.h"
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bool (*b58_sha256_impl)(void *, const void *, size_t) = NULL;
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static const int8_t b58digits_map[] = {
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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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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8,-1,-1,-1,-1,-1,-1,
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-1, 9,10,11,12,13,14,15, 16,-1,17,18,19,20,21,-1,
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22,23,24,25,26,27,28,29, 30,31,32,-1,-1,-1,-1,-1,
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-1,33,34,35,36,37,38,39, 40,41,42,43,-1,44,45,46,
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47,48,49,50,51,52,53,54, 55,56,57,-1,-1,-1,-1,-1,
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};
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typedef uint64_t b58_maxint_t;
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typedef uint32_t b58_almostmaxint_t;
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#define b58_almostmaxint_bits (sizeof(b58_almostmaxint_t) * 8)
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static const b58_almostmaxint_t b58_almostmaxint_mask = ((((b58_maxint_t)1) << b58_almostmaxint_bits) - 1);
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bool b58tobin(void *bin, size_t *binszp, const char *b58, size_t b58sz)
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{
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size_t binsz = *binszp;
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const unsigned char *b58u = (void*)b58;
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unsigned char *binu = bin;
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size_t outisz = (binsz + sizeof(b58_almostmaxint_t) - 1) / sizeof(b58_almostmaxint_t);
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b58_almostmaxint_t outi[outisz];
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b58_maxint_t t;
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b58_almostmaxint_t c;
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size_t i, j;
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uint8_t bytesleft = binsz % sizeof(b58_almostmaxint_t);
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b58_almostmaxint_t zeromask = bytesleft ? (b58_almostmaxint_mask << (bytesleft * 8)) : 0;
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unsigned zerocount = 0;
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if (!b58sz)
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b58sz = strlen(b58);
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for (i = 0; i < outisz; ++i) {
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outi[i] = 0;
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}
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// Leading zeros, just count
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for (i = 0; i < b58sz && b58u[i] == '1'; ++i)
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++zerocount;
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for ( ; i < b58sz; ++i)
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{
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if (b58u[i] & 0x80)
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// High-bit set on invalid digit
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return false;
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if (b58digits_map[b58u[i]] == -1)
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// Invalid base58 digit
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return false;
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c = (unsigned)b58digits_map[b58u[i]];
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for (j = outisz; j--; )
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{
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t = ((b58_maxint_t)outi[j]) * 58 + c;
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c = t >> b58_almostmaxint_bits;
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outi[j] = t & b58_almostmaxint_mask;
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}
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if (c)
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// Output number too big (carry to the next int32)
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return false;
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if (outi[0] & zeromask)
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// Output number too big (last int32 filled too far)
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return false;
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}
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j = 0;
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if (bytesleft) {
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for (i = bytesleft; i > 0; --i) {
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*(binu++) = (outi[0] >> (8 * (i - 1))) & 0xff;
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}
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++j;
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}
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for (; j < outisz; ++j)
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{
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for (i = sizeof(*outi); i > 0; --i) {
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*(binu++) = (outi[j] >> (8 * (i - 1))) & 0xff;
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}
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}
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// Count canonical base58 byte count
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binu = bin;
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for (i = 0; i < binsz; ++i)
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{
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if (binu[i])
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break;
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--*binszp;
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}
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*binszp += zerocount;
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return true;
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}
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static
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bool my_dblsha256(void *hash, const void *data, size_t datasz)
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{
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uint8_t buf[0x20];
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return b58_sha256_impl(buf, data, datasz) && b58_sha256_impl(hash, buf, sizeof(buf));
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}
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int b58check(const void *bin, size_t binsz, const char *base58str, size_t b58sz)
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{
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unsigned char buf[32];
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const uint8_t *binc = bin;
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unsigned i;
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if (binsz < 4)
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return -4;
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if (!my_dblsha256(buf, bin, binsz - 4))
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return -2;
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if (memcmp(&binc[binsz - 4], buf, 4))
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return -1;
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// Check number of zeros is correct AFTER verifying checksum (to avoid possibility of accessing base58str beyond the end)
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for (i = 0; binc[i] == '\0' && base58str[i] == '1'; ++i)
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{} // Just finding the end of zeros, nothing to do in loop
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if (binc[i] == '\0' || base58str[i] == '1')
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return -3;
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return binc[0];
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}
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static const char b58digits_ordered[] = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
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bool b58enc(char *b58, size_t *b58sz, const void *data, size_t binsz)
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{
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const uint8_t *bin = data;
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int carry;
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size_t i, j, high, zcount = 0;
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size_t size;
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while (zcount < binsz && !bin[zcount])
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++zcount;
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size = (binsz - zcount) * 138 / 100 + 1;
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uint8_t buf[size];
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memset(buf, 0, size);
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for (i = zcount, high = size - 1; i < binsz; ++i, high = j)
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{
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for (carry = bin[i], j = size - 1; (j > high) || carry; --j)
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{
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carry += 256 * buf[j];
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buf[j] = carry % 58;
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carry /= 58;
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if (!j) {
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// Otherwise j wraps to maxint which is > high
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break;
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}
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}
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}
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for (j = 0; j < size && !buf[j]; ++j);
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if (*b58sz <= zcount + size - j)
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{
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*b58sz = zcount + size - j + 1;
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return false;
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}
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if (zcount)
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memset(b58, '1', zcount);
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for (i = zcount; j < size; ++i, ++j)
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b58[i] = b58digits_ordered[buf[j]];
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b58[i] = '\0';
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*b58sz = i + 1;
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return true;
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}
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bool b58check_enc(char *b58c, size_t *b58c_sz, uint8_t ver, const void *data, size_t datasz)
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{
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uint8_t buf[1 + datasz + 0x20];
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uint8_t *hash = &buf[1 + datasz];
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buf[0] = ver;
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memcpy(&buf[1], data, datasz);
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if (!my_dblsha256(hash, buf, datasz + 1))
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{
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*b58c_sz = 0;
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return false;
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}
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return b58enc(b58c, b58c_sz, buf, 1 + datasz + 4);
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}
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23
src/thirdparty_base58.h
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23
src/thirdparty_base58.h
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@ -0,0 +1,23 @@
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#ifndef LIBBASE58_H
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#define LIBBASE58_H
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#include <stdbool.h>
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern bool (*b58_sha256_impl)(void *, const void *, size_t);
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extern bool b58tobin(void *bin, size_t *binsz, const char *b58, size_t b58sz);
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extern int b58check(const void *bin, size_t binsz, const char *b58, size_t b58sz);
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extern bool b58enc(char *b58, size_t *b58sz, const void *bin, size_t binsz);
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extern bool b58check_enc(char *b58c, size_t *b58c_sz, uint8_t ver, const void *data, size_t datasz);
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#ifdef __cplusplus
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}
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#endif
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#endif
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