mirror of
https://github.com/cryb-to/cryb-to.git
synced 2024-05-22 01:10:16 +00:00
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*-
|
|
* Copyright (c) 2013-2014 The University of Oslo
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "cryb/impl.h"
|
|
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include <cryb/rfc4648.h>
|
|
|
|
static const char b64enc[] =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
"abcdefghijklmnopqrstuvwxyz"
|
|
"0123456789+/";
|
|
|
|
/*
|
|
* Encode data in RFC 4648 base 64 representation. The target buffer must
|
|
* have room for base64_enclen(len) characters and a terminating NUL.
|
|
*/
|
|
int
|
|
base64_encode(const uint8_t *in, size_t ilen, char *out, size_t *olen)
|
|
{
|
|
uint32_t bits;
|
|
|
|
if (*olen <= base64_enclen(ilen)) {
|
|
*olen = base64_enclen(ilen) + 1;
|
|
errno = ENOSPC;
|
|
return (-1);
|
|
}
|
|
*olen = base64_enclen(ilen) + 1;
|
|
while (ilen >= 3) {
|
|
bits = 0;
|
|
bits |= (uint32_t)*in++ << 16;
|
|
bits |= (uint32_t)*in++ << 8;
|
|
bits |= (uint32_t)*in++;
|
|
ilen -= 3;
|
|
*out++ = b64enc[bits >> 18 & 0x3f];
|
|
*out++ = b64enc[bits >> 12 & 0x3f];
|
|
*out++ = b64enc[bits >> 6 & 0x3f];
|
|
*out++ = b64enc[bits & 0x3f];
|
|
}
|
|
if (ilen > 0) {
|
|
bits = 0;
|
|
switch (ilen) {
|
|
case 2:
|
|
bits |= (uint32_t)in[1] << 8;
|
|
/* fall through */
|
|
case 1:
|
|
bits |= (uint32_t)in[0] << 16;
|
|
break;
|
|
CRYB_NO_DEFAULT_CASE;
|
|
}
|
|
*out++ = b64enc[bits >> 18 & 0x3f];
|
|
*out++ = b64enc[bits >> 12 & 0x3f];
|
|
*out++ = ilen > 1 ? b64enc[bits >> 6 & 0x3f] : '=';
|
|
*out++ = '=';
|
|
}
|
|
*out++ = '\0';
|
|
return (0);
|
|
}
|