104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/*
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MIT License
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Copyright (c) 2013 Barry Steyn
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Copyright (c) 2019 <bakasura@protonmail.ch>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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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 FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include "base64.h"
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#include <stdio.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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#include <openssl/buffer.h>
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#include <stdint.h>
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static const char base64_chars[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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size_t calcDecodeLength(const char *b64input) { //Calculates the length of a decoded string
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size_t len = strlen(b64input),
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padding = 0;
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if (b64input[len - 1] == '=' && 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 base64_encode(const unsigned char *buffer, size_t length, char **b64text) { //Encodes a binary safe base 64 string
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BIO *bio, *b64;
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BUF_MEM *bufferPtr;
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b64 = BIO_new(BIO_f_base64());
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bio = BIO_new(BIO_s_mem());
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bio = BIO_push(b64, bio);
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BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL); //Ignore newlines - write everything in one line
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BIO_set_close(bio, BIO_CLOSE);
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BIO_write(bio, buffer, length);
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BIO_flush(bio);
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BIO_get_mem_ptr(bio, &bufferPtr);
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*b64text = (char *) g_malloc0((*bufferPtr).length + 1);
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memcpy(*b64text, (*bufferPtr).data, (*bufferPtr).length);
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BIO_free_all(bio);
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return (0); //success
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}
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int base64_decode(const char *b64message, unsigned char **buffer, size_t *length) { //Decodes a base64 encoded string
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BIO *bio = NULL, *b64 = NULL;
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int decodeLen = 0;
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if (strspn(b64message, base64_chars) != strlen(b64message))
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return -1;
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decodeLen = calcDecodeLength(b64message);
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if (decodeLen == 0)
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return -1;
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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(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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if (*length == decodeLen) {
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return 0;
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} else {
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*length = 0;
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free(*buffer);
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return -1;
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}
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}
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