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275 lines
8.2 KiB
275 lines
8.2 KiB
/**
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* Copyright (c) 2012-2014 Luke Dashjr
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* Copyright (c) 2013-2014 Pavol Rusnak
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is 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
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* in 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
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* OR 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
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "base58.h"
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#include <stdbool.h>
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#include <string.h>
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#include "memzero.h"
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#include "ripemd160.h"
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#include "sha2.h"
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const char b58digits_ordered[] =
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"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
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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, -1, -1, -1,
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-1, -1, -1, -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, 0, 1, 2, 3, 4, 5, 6, 7,
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8, -1, -1, -1, -1, -1, -1, -1, 9, 10, 11, 12, 13, 14, 15, 16, -1, 17, 18,
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19, 20, 21, -1, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, -1, -1, -1, -1,
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-1, -1, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, -1, 44, 45, 46, 47, 48,
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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 =
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((((b58_maxint_t)1) << b58_almostmaxint_bits) - 1);
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// Decodes a null-terminated Base58 string `b58` to binary and writes the result
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// at the end of the buffer `bin` of size `*binszp`. On success `*binszp` is set
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// to the number of valid bytes at the end of the buffer.
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bool b58tobin(void *bin, size_t *binszp, const char *b58) {
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size_t binsz = *binszp;
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if (binsz == 0) {
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return false;
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}
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const unsigned char *b58u = (const unsigned char *)b58;
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unsigned char *binu = bin;
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size_t outisz =
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(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 = 0;
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b58_almostmaxint_t c = 0;
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size_t i = 0, j = 0;
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uint8_t bytesleft = binsz % sizeof(b58_almostmaxint_t);
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b58_almostmaxint_t zeromask =
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bytesleft ? (b58_almostmaxint_mask << (bytesleft * 8)) : 0;
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unsigned zerocount = 0;
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size_t b58sz = strlen(b58);
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memzero(outi, sizeof(outi));
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// Leading zeros, just count
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for (i = 0; i < b58sz && b58u[i] == '1'; ++i) ++zerocount;
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for (; i < b58sz; ++i) {
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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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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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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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// locate the most significant byte
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binu = bin;
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for (i = 0; i < binsz; ++i) {
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if (binu[i]) break;
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}
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// prepend the correct number of null-bytes
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if (zerocount > i) {
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/* result too large */
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return false;
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}
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*binszp = binsz - i + zerocount;
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return true;
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}
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int b58check(const void *bin, size_t binsz, HasherType hasher_type,
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const char *base58str) {
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unsigned char buf[32] = {0};
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const uint8_t *binc = bin;
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unsigned i = 0;
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if (binsz < 4) return -4;
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hasher_Raw(hasher_type, bin, binsz - 4, buf);
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if (memcmp(&binc[binsz - 4], buf, 4)) return -1;
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// Check number of zeros is correct AFTER verifying checksum (to avoid
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// 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') return -3;
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return binc[0];
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}
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bool b58enc(char *b58, size_t *b58sz, const void *data, size_t binsz) {
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const uint8_t *bin = data;
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int carry = 0;
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size_t i = 0, j = 0, high = 0, zcount = 0;
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size_t size = 0;
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while (zcount < binsz && !bin[zcount]) ++zcount;
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size = (binsz - zcount) * 138 / 100 + 1;
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uint8_t buf[size];
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memzero(buf, size);
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for (i = zcount, high = size - 1; i < binsz; ++i, high = j) {
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for (carry = bin[i], j = size - 1; (j > high) || carry; --j) {
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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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;
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if (*b58sz <= zcount + size - j) {
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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) memset(b58, '1', zcount);
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for (i = zcount; j < size; ++i, ++j) 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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int base58_encode_check(const uint8_t *data, int datalen,
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HasherType hasher_type, char *str, int strsize) {
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if (datalen > 128) {
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return 0;
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}
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uint8_t buf[datalen + 32];
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memset(buf, 0, sizeof(buf));
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uint8_t *hash = buf + datalen;
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memcpy(buf, data, datalen);
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hasher_Raw(hasher_type, data, datalen, hash);
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size_t res = strsize;
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bool success = b58enc(str, &res, buf, datalen + 4);
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memzero(buf, sizeof(buf));
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return success ? res : 0;
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}
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int base58_decode_check(const char *str, HasherType hasher_type, uint8_t *data,
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int datalen) {
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if (datalen > 128) {
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return 0;
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}
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uint8_t d[datalen + 4];
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memset(d, 0, sizeof(d));
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size_t res = datalen + 4;
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if (b58tobin(d, &res, str) != true) {
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return 0;
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}
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uint8_t *nd = d + datalen + 4 - res;
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if (b58check(nd, res, hasher_type, str) < 0) {
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return 0;
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}
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memcpy(data, nd, res - 4);
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return res - 4;
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}
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#if USE_GRAPHENE
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int b58gphcheck(const void *bin, size_t binsz, const char *base58str) {
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unsigned char buf[32] = {0};
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const uint8_t *binc = bin;
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unsigned i = 0;
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if (binsz < 4) return -4;
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ripemd160(bin, binsz - 4, buf); // No double SHA256, but a single RIPEMD160
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if (memcmp(&binc[binsz - 4], buf, 4)) return -1;
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// Check number of zeros is correct AFTER verifying checksum (to avoid
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// 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') return -3;
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return binc[0];
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}
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int base58gph_encode_check(const uint8_t *data, int datalen, char *str,
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int strsize) {
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if (datalen > 128) {
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return 0;
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}
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uint8_t buf[datalen + 32];
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memset(buf, 0, sizeof(buf));
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uint8_t *hash = buf + datalen;
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memcpy(buf, data, datalen);
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ripemd160(data, datalen, hash); // No double SHA256, but a single RIPEMD160
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size_t res = strsize;
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bool success = b58enc(str, &res, buf, datalen + 4);
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memzero(buf, sizeof(buf));
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return success ? res : 0;
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}
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int base58gph_decode_check(const char *str, uint8_t *data, int datalen) {
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if (datalen > 128) {
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return 0;
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}
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uint8_t d[datalen + 4];
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memset(d, 0, sizeof(d));
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size_t res = datalen + 4;
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if (b58tobin(d, &res, str) != true) {
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return 0;
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}
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uint8_t *nd = d + datalen + 4 - res;
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if (b58gphcheck(nd, res, str) < 0) {
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return 0;
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}
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memcpy(data, nd, res - 4);
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return res - 4;
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}
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#endif
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