mirror of
https://github.com/trezor/trezor-firmware.git
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67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/**
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* Copyright (c) 2017 Saleem Rashid
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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, E1PRESS
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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 "base32.h"
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static inline void base32_5to8(const uint8_t *in, uint8_t length, uint8_t *out);
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void base32_encode_unsafe(const uint8_t *in, size_t inlen, uint8_t *out) {
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uint8_t remainder = inlen % 5;
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size_t limit = inlen - remainder;
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size_t i, j;
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for (i = 0, j = 0; i < limit; i += 5, j += 8) {
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base32_5to8(&in[i], 5, &out[j]);
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}
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if (remainder) base32_5to8(&in[i], remainder, &out[j]);
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}
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void base32_5to8(const uint8_t *in, uint8_t length, uint8_t *out) {
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if (length >= 1) {
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out[0] = (in[0] >> 3);
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out[1] = (in[0] & 7) << 2;
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}
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if (length >= 2) {
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out[1] |= (in[1] >> 6);
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out[2] = (in[1] >> 1) & 31;
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out[3] = (in[1] & 1) << 4;
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}
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if (length >= 3) {
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out[3] |= (in[2] >> 4);
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out[4] = (in[2] & 15) << 1;
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}
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if (length >= 4) {
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out[4] |= (in[3] >> 7);
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out[5] = (in[3] >> 2) & 31;
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out[6] = (in[3] & 3) << 3;
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}
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if (length >= 5) {
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out[6] |= (in[4] >> 5);
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out[7] = (in[4] & 31);
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}
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}
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