2002-09-03 15:52:59 +04:00
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/***************************************************************************
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2004-02-23 11:22:43 +03:00
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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2001-08-03 17:51:44 +04:00
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* \___|\___/|_| \_\_____|
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*
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2018-11-22 11:01:24 +03:00
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* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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2001-08-03 17:51:44 +04:00
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*
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2002-09-03 15:52:59 +04:00
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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2016-02-03 02:19:02 +03:00
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* are also available at https://curl.haxx.se/docs/copyright.html.
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2004-02-23 11:22:43 +03:00
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*
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2001-08-03 17:51:44 +04:00
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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2002-09-03 15:52:59 +04:00
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* furnished to do so, under the terms of the COPYING file.
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2001-08-03 17:51:44 +04:00
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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2002-09-03 15:52:59 +04:00
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***************************************************************************/
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2001-08-03 17:51:44 +04:00
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2011-04-18 01:03:33 +04:00
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/* Base64 encoding/decoding */
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2000-09-28 12:01:52 +04:00
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2013-01-06 22:06:49 +04:00
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#include "curl_setup.h"
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2016-06-21 16:47:12 +03:00
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#include "urldata.h" /* for the Curl_easy definition */
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2013-01-04 05:50:28 +04:00
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#include "warnless.h"
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2008-08-17 04:25:38 +04:00
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#include "curl_base64.h"
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2013-01-04 05:50:28 +04:00
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#include "non-ascii.h"
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2000-09-28 12:01:52 +04:00
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2016-04-29 16:46:40 +03:00
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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2015-03-25 01:12:03 +03:00
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#include "curl_memory.h"
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2013-01-04 05:50:28 +04:00
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#include "memdebug.h"
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2004-05-11 15:30:23 +04:00
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2007-01-04 02:04:38 +03:00
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/* ---- Base64 Encoding/Decoding Table --- */
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2014-07-25 10:24:03 +04:00
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static const char base64[]=
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2007-01-04 02:04:38 +03:00
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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2000-10-09 15:12:34 +04:00
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2014-07-25 10:24:03 +04:00
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/* The Base 64 encoding with an URL and filename safe alphabet, RFC 4648
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section 5 */
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static const char base64url[]=
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
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2013-12-01 15:05:11 +04:00
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static size_t decodeQuantum(unsigned char *dest, const char *src)
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1999-12-29 17:20:26 +03:00
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{
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2013-12-01 15:05:11 +04:00
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size_t padding = 0;
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2010-02-21 22:59:09 +03:00
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const char *s, *p;
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2014-10-14 11:44:06 +04:00
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unsigned long i, x = 0;
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2007-01-04 02:04:38 +03:00
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2010-02-21 22:59:09 +03:00
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for(i = 0, s = src; i < 4; i++, s++) {
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2013-12-01 15:05:11 +04:00
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if(*s == '=') {
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2003-01-06 15:41:33 +03:00
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x = (x << 6);
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2013-12-01 15:05:11 +04:00
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padding++;
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}
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else {
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2018-06-02 23:52:56 +03:00
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unsigned long v = 0;
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2014-07-25 10:24:03 +04:00
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p = base64;
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2013-12-01 15:05:11 +04:00
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while(*p && (*p != *s)) {
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v++;
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p++;
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}
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if(*p == *s)
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x = (x << 6) + v;
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else
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return 0;
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}
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2001-08-03 17:51:44 +04:00
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}
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2013-12-01 20:40:55 +04:00
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if(padding < 1)
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2013-12-01 17:47:11 +04:00
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dest[2] = curlx_ultouc(x & 0xFFUL);
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2004-03-01 15:54:59 +03:00
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x >>= 8;
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2013-12-01 20:40:55 +04:00
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if(padding < 2)
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2013-12-01 17:47:11 +04:00
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dest[1] = curlx_ultouc(x & 0xFFUL);
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2004-03-01 15:54:59 +03:00
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x >>= 8;
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2012-03-22 05:40:19 +04:00
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dest[0] = curlx_ultouc(x & 0xFFUL);
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2013-12-01 15:05:11 +04:00
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return 3 - padding;
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2000-09-28 12:01:52 +04:00
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}
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1999-12-29 17:20:26 +03:00
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2004-02-23 11:22:43 +03:00
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/*
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* Curl_base64_decode()
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*
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2011-08-24 10:07:36 +04:00
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* Given a base64 NUL-terminated string at src, decode it and return a
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* pointer in *outptr to a newly allocated memory area holding decoded
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* data. Size of decoded data is returned in variable pointed by outlen.
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*
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* Returns CURLE_OK on success, otherwise specific error code. Function
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* output shall not be considered valid unless CURLE_OK is returned.
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*
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* When decoded data length is 0, returns NULL in *outptr.
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2011-06-10 16:40:46 +04:00
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*
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* @unittest: 1302
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2001-08-03 17:51:44 +04:00
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*/
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2011-08-24 10:07:36 +04:00
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CURLcode Curl_base64_decode(const char *src,
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unsigned char **outptr, size_t *outlen)
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2000-09-28 12:01:52 +04:00
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{
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2013-12-01 17:47:11 +04:00
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size_t srclen = 0;
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2010-02-20 04:15:10 +03:00
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size_t length = 0;
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2013-12-01 17:47:11 +04:00
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size_t padding = 0;
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2010-02-20 04:15:10 +03:00
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size_t i;
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size_t numQuantums;
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size_t rawlen = 0;
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2013-12-01 15:05:11 +04:00
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unsigned char *pos;
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2005-02-22 15:10:30 +03:00
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unsigned char *newstr;
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*outptr = NULL;
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2011-08-24 10:07:36 +04:00
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*outlen = 0;
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2013-12-01 17:47:11 +04:00
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srclen = strlen(src);
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2004-02-23 11:22:43 +03:00
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2013-10-30 11:31:22 +04:00
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/* Check the length of the input string is valid */
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2013-12-01 17:47:11 +04:00
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if(!srclen || srclen % 4)
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2013-10-30 11:31:22 +04:00
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return CURLE_BAD_CONTENT_ENCODING;
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/* Find the position of any = padding characters */
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2001-08-03 17:51:44 +04:00
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while((src[length] != '=') && src[length])
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length++;
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2013-10-30 11:31:22 +04:00
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2005-03-01 02:54:17 +03:00
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/* A maximum of two = padding characters is allowed */
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if(src[length] == '=') {
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2013-12-01 17:47:11 +04:00
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padding++;
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if(src[length + 1] == '=')
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padding++;
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2005-03-01 02:54:17 +03:00
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}
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2013-10-30 12:11:10 +04:00
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2013-10-30 11:31:22 +04:00
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/* Check the = padding characters weren't part way through the input */
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2013-12-01 17:47:11 +04:00
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if(length + padding != srclen)
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2013-10-30 11:31:22 +04:00
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return CURLE_BAD_CONTENT_ENCODING;
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2004-02-23 11:22:43 +03:00
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2013-10-30 11:31:22 +04:00
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/* Calculate the number of quantums */
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2013-12-01 17:47:11 +04:00
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numQuantums = srclen / 4;
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2005-03-01 02:54:17 +03:00
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2013-10-30 11:31:22 +04:00
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/* Calculate the size of the decoded string */
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2013-12-01 17:47:11 +04:00
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rawlen = (numQuantums * 3) - padding;
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2004-02-23 11:22:43 +03:00
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2013-11-30 23:09:09 +04:00
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/* Allocate our buffer including room for a zero terminator */
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newstr = malloc(rawlen + 1);
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2005-02-22 15:10:30 +03:00
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if(!newstr)
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2011-08-24 10:07:36 +04:00
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return CURLE_OUT_OF_MEMORY;
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2005-02-22 15:10:30 +03:00
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2013-12-01 15:05:11 +04:00
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pos = newstr;
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2005-02-22 15:10:30 +03:00
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2013-12-01 17:47:11 +04:00
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/* Decode the quantums */
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for(i = 0; i < numQuantums; i++) {
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2014-10-14 11:44:06 +04:00
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size_t result = decodeQuantum(pos, src);
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2013-12-01 15:05:11 +04:00
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if(!result) {
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2015-03-16 17:01:15 +03:00
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free(newstr);
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2013-12-01 15:05:11 +04:00
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return CURLE_BAD_CONTENT_ENCODING;
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}
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pos += result;
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src += 4;
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2000-09-28 12:01:52 +04:00
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}
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2001-08-03 17:51:44 +04:00
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2013-11-30 23:09:09 +04:00
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/* Zero terminate */
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2013-12-01 17:47:11 +04:00
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*pos = '\0';
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2011-08-24 10:07:36 +04:00
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2013-12-01 15:05:11 +04:00
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/* Return the decoded data */
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*outptr = newstr;
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2013-11-30 23:09:09 +04:00
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*outlen = rawlen;
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2011-08-24 10:07:36 +04:00
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return CURLE_OK;
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2000-09-28 12:01:52 +04:00
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}
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2000-09-21 12:46:44 +04:00
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2014-07-25 10:24:03 +04:00
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static CURLcode base64_encode(const char *table64,
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2016-06-21 16:47:12 +03:00
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struct Curl_easy *data,
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2014-07-25 10:24:03 +04:00
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const char *inputbuff, size_t insize,
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char **outptr, size_t *outlen)
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2000-09-28 12:01:52 +04:00
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{
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2016-03-13 20:14:57 +03:00
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CURLcode result;
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2001-08-03 17:51:44 +04:00
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unsigned char ibuf[3];
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unsigned char obuf[4];
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int i;
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int inputparts;
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char *output;
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char *base64data;
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2007-02-01 15:23:00 +03:00
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char *convbuf = NULL;
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2001-08-03 17:51:44 +04:00
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2009-06-05 03:55:56 +04:00
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const char *indata = inputbuff;
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2001-08-03 17:51:44 +04:00
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2011-08-24 10:07:36 +04:00
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*outptr = NULL;
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*outlen = 0;
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2004-05-12 17:23:17 +04:00
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2016-03-13 20:59:06 +03:00
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if(!insize)
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2001-08-03 17:51:44 +04:00
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insize = strlen(indata);
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2016-09-28 01:05:12 +03:00
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#if SIZEOF_SIZE_T == 4
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if(insize > UINT_MAX/4)
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return CURLE_OUT_OF_MEMORY;
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#endif
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2016-03-13 20:59:06 +03:00
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base64data = output = malloc(insize * 4 / 3 + 4);
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if(!output)
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2011-08-24 10:07:36 +04:00
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return CURLE_OUT_OF_MEMORY;
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2001-08-03 17:51:44 +04:00
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2007-01-04 02:04:38 +03:00
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/*
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* The base64 data needs to be created using the network encoding
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* not the host encoding. And we can't change the actual input
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* so we copy it to a buffer, translate it, and use that instead.
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*/
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2016-03-13 20:14:57 +03:00
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result = Curl_convert_clone(data, indata, insize, &convbuf);
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if(result) {
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2011-05-23 18:55:49 +04:00
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free(output);
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2016-03-13 20:14:57 +03:00
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return result;
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2011-05-23 18:55:49 +04:00
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}
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2011-04-20 02:48:20 +04:00
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if(convbuf)
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indata = (char *)convbuf;
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2007-01-04 02:04:38 +03:00
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2001-08-03 17:51:44 +04:00
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while(insize > 0) {
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2011-04-20 17:17:42 +04:00
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for(i = inputparts = 0; i < 3; i++) {
|
2003-02-13 21:30:10 +03:00
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if(insize > 0) {
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2001-08-03 17:51:44 +04:00
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inputparts++;
|
2010-02-20 22:51:02 +03:00
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ibuf[i] = (unsigned char) *indata;
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2001-08-03 17:51:44 +04:00
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indata++;
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insize--;
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}
|
1999-12-29 17:20:26 +03:00
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else
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2001-08-03 17:51:44 +04:00
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ibuf[i] = 0;
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1999-12-29 17:20:26 +03:00
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}
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2004-02-23 11:22:43 +03:00
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2006-07-20 01:14:02 +04:00
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obuf[0] = (unsigned char) ((ibuf[0] & 0xFC) >> 2);
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obuf[1] = (unsigned char) (((ibuf[0] & 0x03) << 4) | \
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((ibuf[1] & 0xF0) >> 4));
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obuf[2] = (unsigned char) (((ibuf[1] & 0x0F) << 2) | \
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((ibuf[2] & 0xC0) >> 6));
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obuf[3] = (unsigned char) (ibuf[2] & 0x3F);
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2001-08-03 17:51:44 +04:00
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switch(inputparts) {
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case 1: /* only one byte read */
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2018-11-22 11:01:24 +03:00
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msnprintf(output, 5, "%c%c==",
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table64[obuf[0]],
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table64[obuf[1]]);
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2001-08-03 17:51:44 +04:00
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break;
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2016-03-13 20:59:06 +03:00
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2001-08-03 17:51:44 +04:00
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case 2: /* two bytes read */
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2018-11-22 11:01:24 +03:00
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msnprintf(output, 5, "%c%c%c=",
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table64[obuf[0]],
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table64[obuf[1]],
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table64[obuf[2]]);
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2001-08-03 17:51:44 +04:00
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break;
|
2016-03-13 20:59:06 +03:00
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2001-08-03 17:51:44 +04:00
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default:
|
2018-11-22 11:01:24 +03:00
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msnprintf(output, 5, "%c%c%c%c",
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table64[obuf[0]],
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table64[obuf[1]],
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table64[obuf[2]],
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table64[obuf[3]]);
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2001-08-03 17:51:44 +04:00
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break;
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1999-12-29 17:20:26 +03:00
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}
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2001-08-03 17:51:44 +04:00
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output += 4;
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1999-12-29 17:20:26 +03:00
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}
|
2016-03-13 20:59:06 +03:00
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/* Zero terminate */
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2011-08-24 10:07:36 +04:00
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*output = '\0';
|
2016-03-13 20:59:06 +03:00
|
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/* Return the pointer to the new data (allocated memory) */
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*outptr = base64data;
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2001-08-03 17:51:44 +04:00
|
|
|
|
2015-03-11 19:41:01 +03:00
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|
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free(convbuf);
|
2011-04-20 02:48:20 +04:00
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2016-03-13 20:59:06 +03:00
|
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|
/* Return the length of the new data */
|
|
|
|
*outlen = strlen(base64data);
|
2011-08-24 10:07:36 +04:00
|
|
|
|
|
|
|
return CURLE_OK;
|
2001-08-03 17:51:44 +04:00
|
|
|
}
|
2014-07-25 10:24:03 +04:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Curl_base64_encode()
|
|
|
|
*
|
|
|
|
* Given a pointer to an input buffer and an input size, encode it and
|
|
|
|
* return a pointer in *outptr to a newly allocated memory area holding
|
|
|
|
* encoded data. Size of encoded data is returned in variable pointed by
|
|
|
|
* outlen.
|
|
|
|
*
|
|
|
|
* Input length of 0 indicates input buffer holds a NUL-terminated string.
|
|
|
|
*
|
|
|
|
* Returns CURLE_OK on success, otherwise specific error code. Function
|
|
|
|
* output shall not be considered valid unless CURLE_OK is returned.
|
|
|
|
*
|
|
|
|
* When encoded data length is 0, returns NULL in *outptr.
|
|
|
|
*
|
|
|
|
* @unittest: 1302
|
|
|
|
*/
|
2016-06-21 16:47:12 +03:00
|
|
|
CURLcode Curl_base64_encode(struct Curl_easy *data,
|
2014-07-25 10:24:03 +04:00
|
|
|
const char *inputbuff, size_t insize,
|
|
|
|
char **outptr, size_t *outlen)
|
|
|
|
{
|
|
|
|
return base64_encode(base64, data, inputbuff, insize, outptr, outlen);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Curl_base64url_encode()
|
|
|
|
*
|
|
|
|
* Given a pointer to an input buffer and an input size, encode it and
|
|
|
|
* return a pointer in *outptr to a newly allocated memory area holding
|
|
|
|
* encoded data. Size of encoded data is returned in variable pointed by
|
|
|
|
* outlen.
|
|
|
|
*
|
|
|
|
* Input length of 0 indicates input buffer holds a NUL-terminated string.
|
|
|
|
*
|
|
|
|
* Returns CURLE_OK on success, otherwise specific error code. Function
|
|
|
|
* output shall not be considered valid unless CURLE_OK is returned.
|
|
|
|
*
|
|
|
|
* When encoded data length is 0, returns NULL in *outptr.
|
|
|
|
*
|
2014-07-25 10:38:16 +04:00
|
|
|
* @unittest: 1302
|
2014-07-25 10:24:03 +04:00
|
|
|
*/
|
2016-06-21 16:47:12 +03:00
|
|
|
CURLcode Curl_base64url_encode(struct Curl_easy *data,
|
2014-07-25 10:24:03 +04:00
|
|
|
const char *inputbuff, size_t insize,
|
|
|
|
char **outptr, size_t *outlen)
|
|
|
|
{
|
|
|
|
return base64_encode(base64url, data, inputbuff, insize, outptr, outlen);
|
|
|
|
}
|