146 lines
5.0 KiB
C
146 lines
5.0 KiB
C
/**
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* @file base64.c
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* @version $Format:%h%d$
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*
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* Base64 operations.
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*/
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/*
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* Copyright (c) 2013-2017 INSIDE Secure Corporation
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* Copyright (c) PeerSec Networks, 2002-2011
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* All Rights Reserved
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*
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* The latest version of this code is available at http://www.matrixssl.org
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*
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* This software is open source; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This General Public License does NOT permit incorporating this software
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* into proprietary programs. If you are unable to comply with the GPL, a
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* commercial license for this software may be purchased from INSIDE at
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* http://www.insidesecure.com/
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*
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* This program is distributed in WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* http://www.gnu.org/copyleft/gpl.html
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*/
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/******************************************************************************/
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#include "osdep_stdio.h"
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#include "../cryptoImpl.h"
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#ifdef USE_BASE64_DECODE
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static const unsigned char map[] = {
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
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255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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49, 50, 51
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/* , 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255
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*/
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};
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int32_t psBase64decode(const unsigned char *in, psSize_t len,
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unsigned char *out, psSize_t *outlen)
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{
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unsigned int t;
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unsigned char c;
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uint16_t x, y, z;
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int16_t g;
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if (in == NULL || out == NULL || outlen == NULL)
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{
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psTraceCrypto("Arg failure to psBase64decode\n");
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return PS_ARG_FAIL;
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}
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g = 3;
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for (x = y = z = t = 0; x < len; x++)
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{
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/* Save a little space by skipping values that would be 255 in the full map */
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if (in[x] > 122)
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{
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continue;
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}
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c = map[in[x]];
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if (c == 255)
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{
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continue;
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}
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/* the final '=' symbols are read and used to trim the remaining bytes */
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if (c == 254)
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{
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c = 0;
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/* prevent g < 0 which would potentially allow an overflow later */
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if (--g < 0)
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{
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psTraceCrypto("Negative g failure in psBase64decode\n");
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return PS_LIMIT_FAIL;
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}
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}
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else if (g != 3)
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{
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/* we only allow = to be at the end */
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psTraceCrypto("g failure in psBase64decode\n");
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return PS_PARSE_FAIL;
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}
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t = (t << 6) | c;
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if (++y == 4)
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{
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if (z + g > *outlen)
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{
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psTraceCrypto("outlen too small for psBase64decode\n");
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return PS_LIMIT_FAIL;
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}
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out[z++] = (unsigned char) ((t >> 16) & 0xFF);
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if (g > 1)
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{
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out[z++] = (unsigned char) ((t >> 8) & 0xFF);
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}
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if (g > 2)
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{
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out[z++] = (unsigned char) (t & 0xFF);
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}
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y = t = 0;
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}
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}
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if (y != 0)
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{
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psTraceCrypto("y failure in psBase64decode\n");
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return PS_PARSE_FAIL;
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}
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*outlen = z;
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return PS_SUCCESS;
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}
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#endif /* USE_BASE64_DECODE */
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/******************************************************************************/
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/******************************************************************************/
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