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88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/**
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* NEURON IIoT System for Industry 4.0
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* Copyright (C) 2020-2022 EMQ Technologies Co., Ltd All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/bio.h>
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#include <openssl/evp.h>
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char *neu_encode64(const unsigned char *input, int length)
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{
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const int pl = 4 * ((length + 2) / 3);
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unsigned char *output = calloc(pl + 1, 1);
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const int ol = EVP_EncodeBlock(output, input, length);
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assert(pl == ol);
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return (char *) output;
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}
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size_t calcDecodeLength(const char *b64input)
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{ // Calculates the length of a decoded string
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size_t len = strlen(b64input), padding = 0;
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if (0 == len) {
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return 0;
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}
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if (b64input[len - 1] == '=' &&
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b64input[len - 2] == '=') // last two chars are =
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padding = 2;
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else if (b64input[len - 1] == '=') // last char is =
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padding = 1;
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return (len * 3) / 4 - padding;
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}
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int Base64Decode(const char *b64message, unsigned char **buffer, int *length)
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{ // Decodes a base64 encoded string
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BIO *bio, *b64;
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int decodeLen = calcDecodeLength(b64message);
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*buffer = (unsigned char *) malloc(decodeLen + 1);
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(*buffer)[decodeLen] = '\0';
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bio = BIO_new_mem_buf(b64message, -1);
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b64 = BIO_new(BIO_f_base64());
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bio = BIO_push(b64, bio);
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BIO_set_flags(
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bio, BIO_FLAGS_BASE64_NO_NL); // Do not use newlines to flush buffer
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*length = BIO_read(bio, *buffer, strlen(b64message));
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BIO_free_all(bio);
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// length should equal decodeLen, else something went horribly wrong
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if (*length != decodeLen) {
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free(*buffer);
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*buffer = NULL;
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return -1;
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}
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return (0); // success
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}
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unsigned char *neu_decode64(int *length, const char *input)
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{
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unsigned char *output;
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Base64Decode(input, &output, length);
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return output;
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} |