138 lines
4.2 KiB
C++
138 lines
4.2 KiB
C++
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 K. Isom <coder@kyleisom.net>
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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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* 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 in
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* 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 OR
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* 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 THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <cassert>
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#include <cstdint>
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#include <cstring>
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#include <iostream>
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#include <emsha/emsha.h>
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using std::uint8_t;
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using std::uint32_t;
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namespace emsha {
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bool
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HashEqual(const uint8_t *a, const uint8_t *b)
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{
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uint8_t res = 0;
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EMSHA_CHECK(a != nullptr, false);
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EMSHA_CHECK(b != nullptr, false);
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for (uint32_t i = 0; i < SHA256_HASH_SIZE; i++) {
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res += a[i] ^ b[i];
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}
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return res == 0;
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}
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#ifndef EMSHA_NO_HEXSTRING
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#ifndef EMSHA_NO_HEXLUT
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// If using a lookup table is permitted, then the faster way to do this
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// is to use one.
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static void
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writeHexChar(uint8_t *dest, uint8_t src)
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{
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static constexpr uint8_t lut[256][3] = {
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"00", "01", "02", "03", "04", "05", "06", "07",
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"08", "09", "0a", "0b", "0c", "0d", "0e", "0f",
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"10", "11", "12", "13", "14", "15", "16", "17",
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"18", "19", "1a", "1b", "1c", "1d", "1e", "1f",
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"20", "21", "22", "23", "24", "25", "26", "27",
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"28", "29", "2a", "2b", "2c", "2d", "2e", "2f",
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"30", "31", "32", "33", "34", "35", "36", "37",
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"38", "39", "3a", "3b", "3c", "3d", "3e", "3f",
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"40", "41", "42", "43", "44", "45", "46", "47",
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"48", "49", "4a", "4b", "4c", "4d", "4e", "4f",
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"50", "51", "52", "53", "54", "55", "56", "57",
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"58", "59", "5a", "5b", "5c", "5d", "5e", "5f",
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"60", "61", "62", "63", "64", "65", "66", "67",
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"68", "69", "6a", "6b", "6c", "6d", "6e", "6f",
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"70", "71", "72", "73", "74", "75", "76", "77",
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"78", "79", "7a", "7b", "7c", "7d", "7e", "7f",
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"80", "81", "82", "83", "84", "85", "86", "87",
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"88", "89", "8a", "8b", "8c", "8d", "8e", "8f",
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"90", "91", "92", "93", "94", "95", "96", "97",
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"98", "99", "9a", "9b", "9c", "9d", "9e", "9f",
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"a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7",
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"a8", "a9", "aa", "ab", "ac", "ad", "ae", "af",
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"b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7",
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"b8", "b9", "ba", "bb", "bc", "bd", "be", "bf",
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"c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7",
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"c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf",
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"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
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"d8", "d9", "da", "db", "dc", "dd", "de", "df",
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"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7",
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"e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef",
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
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"f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff"
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};
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*dest = lut[src][0];
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*(dest + 1) = lut[src][1];
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}
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#else // #ifndef EMSHA_NO_HEXLUT
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// If the full lookup table can't be used, e.g. because MSP430-level
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// memory constraints, we'll work around this using a small (16-byte)
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// lookup table and some bit shifting. On platforms where even this is
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// too much, the HexString functionality will just be disabled.
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static void
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writeHexChar(uint8_t *dest, uint8_t src)
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{
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static constexpr uint8_t lut[] = {
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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};
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*dest = lut[((src & 0xF0) >> 4)];
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*(dest + 1) = lut[(src & 0xF)];
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}
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#endif // #ifndef EMSHA_NO_HEXLUT
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void
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HexString(uint8_t *dest, uint8_t *src, uint32_t srclen)
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{
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size_t dp = 0;
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for (uint32_t i = 0; i < srclen; i++) {
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writeHexChar(&dest[dp], src[i]);
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dp += 2;
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}
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}
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#endif // #ifndef EMSHA_NO_HEXSTRING
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} // end of namespace emsha
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