Add base64 encoder & decoder
I prefer to have these independent of the crypto suite that's being used.rsa-aes
Andri Yngvason
parent
24e4c5900a
commit
923fa4a53a
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/* Copyright (c) 2023 Andri Yngvason
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#pragma once
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#include <stdint.h>
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#include <unistd.h>
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#define BASE64_ENCODED_SIZE(x) ((((x) + 2) / 3) * 4 + 1)
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#define BASE64_DECODED_MAX_SIZE(x) ((((x) + 3) / 4) * 3)
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void base64_encode(char* dst, const uint8_t* src, size_t src_len);
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ssize_t base64_decode(uint8_t* dst, const char* src);
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/* Copyright (c) 2023 Andri Yngvason
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "base64.h"
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#include <unistd.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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static const char base64_enc_lut[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static const uint8_t base64_validation_lut[256] = {
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['A'] = 1, ['B'] = 1, ['C'] = 1, ['D'] = 1,
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['E'] = 1, ['F'] = 1, ['G'] = 1, ['H'] = 1,
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['I'] = 1, ['J'] = 1, ['K'] = 1, ['L'] = 1,
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['M'] = 1, ['N'] = 1, ['O'] = 1, ['P'] = 1,
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['Q'] = 1, ['R'] = 1, ['S'] = 1, ['T'] = 1,
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['U'] = 1, ['V'] = 1, ['W'] = 1, ['X'] = 1,
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['Y'] = 1, ['Z'] = 1, ['a'] = 1, ['b'] = 1,
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['c'] = 1, ['d'] = 1, ['e'] = 1, ['f'] = 1,
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['g'] = 1, ['h'] = 1, ['i'] = 1, ['j'] = 1,
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['k'] = 1, ['l'] = 1, ['m'] = 1, ['n'] = 1,
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['o'] = 1, ['p'] = 1, ['q'] = 1, ['r'] = 1,
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['s'] = 1, ['t'] = 1, ['u'] = 1, ['v'] = 1,
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['w'] = 1, ['x'] = 1, ['y'] = 1, ['z'] = 1,
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['0'] = 1, ['1'] = 1, ['2'] = 1, ['3'] = 1,
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['4'] = 1, ['5'] = 1, ['6'] = 1, ['7'] = 1,
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['8'] = 1, ['9'] = 1, ['+'] = 1, ['/'] = 1,
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['-'] = 1, ['_'] = 1, ['='] = 1,
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};
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static const uint8_t base64_dec_lut[256] = {
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['A'] = 0x00, ['B'] = 0x01, ['C'] = 0x02, ['D'] = 0x03,
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['E'] = 0x04, ['F'] = 0x05, ['G'] = 0x06, ['H'] = 0x07,
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['I'] = 0x08, ['J'] = 0x09, ['K'] = 0x0a, ['L'] = 0x0b,
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['M'] = 0x0c, ['N'] = 0x0d, ['O'] = 0x0e, ['P'] = 0x0f,
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['Q'] = 0x10, ['R'] = 0x11, ['S'] = 0x12, ['T'] = 0x13,
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['U'] = 0x14, ['V'] = 0x15, ['W'] = 0x16, ['X'] = 0x17,
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['Y'] = 0x18, ['Z'] = 0x19, ['a'] = 0x1a, ['b'] = 0x1b,
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['c'] = 0x1c, ['d'] = 0x1d, ['e'] = 0x1e, ['f'] = 0x1f,
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['g'] = 0x20, ['h'] = 0x21, ['i'] = 0x22, ['j'] = 0x23,
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['k'] = 0x24, ['l'] = 0x25, ['m'] = 0x26, ['n'] = 0x27,
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['o'] = 0x28, ['p'] = 0x29, ['q'] = 0x2a, ['r'] = 0x2b,
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['s'] = 0x2c, ['t'] = 0x2d, ['u'] = 0x2e, ['v'] = 0x2f,
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['w'] = 0x30, ['x'] = 0x31, ['y'] = 0x32, ['z'] = 0x33,
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['0'] = 0x34, ['1'] = 0x35, ['2'] = 0x36, ['3'] = 0x37,
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['4'] = 0x38, ['5'] = 0x39, ['6'] = 0x3a, ['7'] = 0x3b,
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['8'] = 0x3c, ['9'] = 0x3d, ['+'] = 0x3e, ['/'] = 0x3f,
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['-'] = 0x3e, ['_'] = 0x3f,
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};
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void base64_encode(char* dst, const uint8_t* src, size_t src_len)
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{
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size_t i = 0;
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for (; i < src_len / 3; ++i) {
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uint32_t tmp = 0;
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tmp |= (uint32_t)src[i * 3 + 0] << 16;
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tmp |= (uint32_t)src[i * 3 + 1] << 8;
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tmp |= (uint32_t)src[i * 3 + 2];
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dst[i * 4 + 0] = base64_enc_lut[tmp >> 18];
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dst[i * 4 + 1] = base64_enc_lut[(tmp >> 12) & 0x3f];
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dst[i * 4 + 2] = base64_enc_lut[(tmp >> 6) & 0x3f];
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dst[i * 4 + 3] = base64_enc_lut[tmp & 0x3f];
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}
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size_t rem = src_len % 3;
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if (rem == 0) {
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dst[i * 4] = '\0';
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return;
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}
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uint32_t tmp = 0;
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for (size_t r = 0; r < rem; ++r) {
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size_t s = (2 - r) * 8;
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tmp |= (uint32_t)src[i * 3 + r] << s;
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}
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size_t di = 0;
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for (; di < rem + 1; ++di) {
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size_t s = (3 - di) * 6;
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dst[i * 4 + di] = base64_enc_lut[(tmp >> s) & 0x3f];
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}
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for (; di < 4; ++di) {
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dst[i * 4 + di] = '=';
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}
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dst[i * 4 + di] = '\0';
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}
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static bool base64_is_valid(const char* src)
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{
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for (int i = 0; src[i]; i++)
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if (!base64_validation_lut[(uint8_t)src[i]])
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return false;
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return true;
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}
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ssize_t base64_decode(uint8_t* dst, const char* src)
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{
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if (!base64_is_valid(src))
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return -1;
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size_t src_len = strcspn(src, "=");
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size_t i = 0;
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for (; i < src_len / 4; ++i) {
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uint32_t tmp = 0;
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tmp |= (uint32_t)base64_dec_lut[(uint8_t)src[i * 4 + 0]] << 18;
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tmp |= (uint32_t)base64_dec_lut[(uint8_t)src[i * 4 + 1]] << 12;
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tmp |= (uint32_t)base64_dec_lut[(uint8_t)src[i * 4 + 2]] << 6;
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tmp |= (uint32_t)base64_dec_lut[(uint8_t)src[i * 4 + 3]];
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dst[i * 3 + 0] = tmp >> 16;
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dst[i * 3 + 1] = (tmp >> 8) & 0xff;
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dst[i * 3 + 2] = tmp & 0xff;
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}
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size_t rem = src_len % 4;
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if (rem == 0)
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return i * 3;
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size_t di = 0;
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uint32_t tmp = 0;
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for (size_t r = 0; r < rem; ++r) {
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size_t s = (3 - r) * 6;
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tmp |= (uint32_t)base64_dec_lut[(uint8_t)src[i * 4 + r]] << s;
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}
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for (; di < (rem * 3) / 4; ++di) {
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size_t s = (2 - di) * 8;
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dst[i * 3 + di] = (tmp >> s) & 0xff;
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}
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return i * 3 + di;
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}
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@ -10,3 +10,12 @@ pixels = executable('pixels',
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],
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)
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test('pixels', pixels)
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base64 = executable('base64',
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[
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'test-base64.c',
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'../src/base64.c',
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],
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include_directories: inc,
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)
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test('base64', base64)
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#include "base64.h"
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#include <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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static bool test_encode_0(void)
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{
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char buf[1] = {};
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base64_encode(buf, (const uint8_t*)"", 0);
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return strlen(buf) == 0;
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}
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static bool test_encode_1(void)
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{
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static const char input[] = "a";
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char buf[BASE64_ENCODED_SIZE(sizeof(input) - 1)] = {};
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base64_encode(buf, (const uint8_t*)input, sizeof(input) - 1);
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return strcmp(buf, "YQ==") == 0;
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}
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static bool test_encode_2(void)
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{
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static const char input[] = "ab";
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char buf[BASE64_ENCODED_SIZE(sizeof(input) - 1)] = {};
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base64_encode(buf, (const uint8_t*)input, sizeof(input) - 1);
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return strcmp(buf, "YWI=") == 0;
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}
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static bool test_encode_3(void)
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{
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static const char input[] = "abc";
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char buf[BASE64_ENCODED_SIZE(sizeof(input) - 1)] = {};
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base64_encode(buf, (const uint8_t*)input, sizeof(input) - 1);
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return strcmp(buf, "YWJj") == 0;
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}
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static bool test_encode_4(void)
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{
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static const char input[] = "abcd";
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char buf[BASE64_ENCODED_SIZE(sizeof(input) - 1)] = {};
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base64_encode(buf, (const uint8_t*)input, sizeof(input) - 1);
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return strcmp(buf, "YWJjZA==") == 0;
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}
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static bool test_encode_5(void)
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{
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static const char input[] = "abcde";
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char buf[BASE64_ENCODED_SIZE(sizeof(input) - 1)] = {};
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base64_encode(buf, (const uint8_t*)input, sizeof(input) - 1);
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return strcmp(buf, "YWJjZGU=") == 0;
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}
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static bool test_decode_0(void)
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{
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uint8_t buf[1] = {};
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ssize_t r = base64_decode(buf, "");
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return r == 0 && buf[0] == 0;
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}
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static bool test_decode_1(void)
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{
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static const char input[] = "YQ==";
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uint8_t buf[BASE64_DECODED_MAX_SIZE(sizeof(input) - 1)] = {};
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ssize_t r = base64_decode(buf, input);
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return r == 1 && memcmp(buf, "a", r) == 0;
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}
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static bool test_decode_2(void)
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{
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static const char input[] = "YWI=";
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uint8_t buf[BASE64_DECODED_MAX_SIZE(sizeof(input) - 1)] = {};
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ssize_t r = base64_decode(buf, input);
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return r == 2 && memcmp(buf, "ab", r) == 0;
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}
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static bool test_decode_3(void)
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{
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static const char input[] = "YWJj";
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uint8_t buf[BASE64_DECODED_MAX_SIZE(sizeof(input) - 1)] = {};
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ssize_t r = base64_decode(buf, input);
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return r == 3 && memcmp(buf, "abc", r) == 0;
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}
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static bool test_decode_4(void)
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{
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static const char input[] = "YWJjZA==";
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uint8_t buf[BASE64_DECODED_MAX_SIZE(sizeof(input) - 1)] = {};
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ssize_t r = base64_decode(buf, input);
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return r == 4 && memcmp(buf, "abcd", r) == 0;
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}
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static bool test_decode_5(void)
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{
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static const char input[] = "YWJjZGU=";
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uint8_t buf[BASE64_DECODED_MAX_SIZE(sizeof(input) - 1)] = {};
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ssize_t r = base64_decode(buf, input);
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return r == 5 && memcmp(buf, "abcde", r) == 0;
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}
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#define XSTR(s) STR(s)
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#define STR(s) #s
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#define RUN_TEST(name) ({ \
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bool ok = test_ ## name(); \
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printf("[%s] %s\n", ok ? " OK " : "FAIL", XSTR(name)); \
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ok; \
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})
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int main()
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{
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bool ok = true;
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ok &= RUN_TEST(encode_0);
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ok &= RUN_TEST(encode_1);
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ok &= RUN_TEST(encode_2);
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ok &= RUN_TEST(encode_3);
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ok &= RUN_TEST(encode_4);
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ok &= RUN_TEST(encode_5);
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ok &= RUN_TEST(decode_0);
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ok &= RUN_TEST(decode_1);
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ok &= RUN_TEST(decode_2);
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ok &= RUN_TEST(decode_3);
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ok &= RUN_TEST(decode_4);
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ok &= RUN_TEST(decode_5);
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return ok ? 0 : 1;
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}
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