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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+
+/* Base64 encoding/decoding */
+
+#include "curl_setup.h"
+
+#if !defined(CURL_DISABLE_HTTP_AUTH) || defined(USE_SSH) || \
+ !defined(CURL_DISABLE_LDAP) || \
+ !defined(CURL_DISABLE_SMTP) || \
+ !defined(CURL_DISABLE_POP3) || \
+ !defined(CURL_DISABLE_IMAP) || \
+ !defined(CURL_DISABLE_DIGEST_AUTH) || \
+ !defined(CURL_DISABLE_DOH) || defined(USE_SSL) || defined(BUILDING_CURL)
+#include "curl/curl.h"
+#include "warnless.h"
+#include "curl_base64.h"
+
+/* The last 2 #include files should be in this order */
+#ifdef BUILDING_LIBCURL
+#include "curl_memory.h"
+#endif
+#include "memdebug.h"
+
+/* ---- Base64 Encoding/Decoding Table --- */
+/* Padding character string starts at offset 64. */
+static const char base64encdec[]=
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+
+/* The Base 64 encoding with a URL and filename safe alphabet, RFC 4648
+ section 5 */
+static const char base64url[]=
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
+static const unsigned char decodetable[] =
+{ 62, 255, 255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255,
+ 255, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
+ 17, 18, 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255, 255, 26, 27, 28,
+ 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51 };
+/*
+ * Curl_base64_decode()
+ *
+ * Given a base64 NUL-terminated string at src, decode it and return a
+ * pointer in *outptr to a newly allocated memory area holding decoded
+ * data. Size of decoded data is returned in variable pointed by outlen.
+ *
+ * Returns CURLE_OK on success, otherwise specific error code. Function
+ * output shall not be considered valid unless CURLE_OK is returned.
+ *
+ * When decoded data length is 0, returns NULL in *outptr.
+ *
+ * @unittest: 1302
+ */
+CURLcode Curl_base64_decode(const char *src,
+ unsigned char **outptr, size_t *outlen)
+{
+ size_t srclen = 0;
+ size_t padding = 0;
+ size_t i;
+ size_t numQuantums;
+ size_t fullQuantums;
+ size_t rawlen = 0;
+ unsigned char *pos;
+ unsigned char *newstr;
+ unsigned char lookup[256];
+
+ *outptr = NULL;
+ *outlen = 0;
+ srclen = strlen(src);
+
+ /* Check the length of the input string is valid */
+ if(!srclen || srclen % 4)
+ return CURLE_BAD_CONTENT_ENCODING;
+
+ /* srclen is at least 4 here */
+ while(src[srclen - 1 - padding] == '=') {
+ /* count padding characters */
+ padding++;
+ /* A maximum of two = padding characters is allowed */
+ if(padding > 2)
+ return CURLE_BAD_CONTENT_ENCODING;
+ }
+
+ /* Calculate the number of quantums */
+ numQuantums = srclen / 4;
+ fullQuantums = numQuantums - (padding ? 1 : 0);
+
+ /* Calculate the size of the decoded string */
+ rawlen = (numQuantums * 3) - padding;
+
+ /* Allocate our buffer including room for a null-terminator */
+ newstr = malloc(rawlen + 1);
+ if(!newstr)
+ return CURLE_OUT_OF_MEMORY;
+
+ pos = newstr;
+
+ memset(lookup, 0xff, sizeof(lookup));
+ memcpy(&lookup['+'], decodetable, sizeof(decodetable));
+ /* replaces
+ {
+ unsigned char c;
+ const unsigned char *p = (const unsigned char *)base64encdec;
+ for(c = 0; *p; c++, p++)
+ lookup[*p] = c;
+ }
+ */
+
+ /* Decode the complete quantums first */
+ for(i = 0; i < fullQuantums; i++) {
+ unsigned char val;
+ unsigned int x = 0;
+ int j;
+
+ for(j = 0; j < 4; j++) {
+ val = lookup[(unsigned char)*src++];
+ if(val == 0xff) /* bad symbol */
+ goto bad;
+ x = (x << 6) | val;
+ }
+ pos[2] = x & 0xff;
+ pos[1] = (x >> 8) & 0xff;
+ pos[0] = (x >> 16) & 0xff;
+ pos += 3;
+ }
+ if(padding) {
+ /* this means either 8 or 16 bits output */
+ unsigned char val;
+ unsigned int x = 0;
+ int j;
+ size_t padc = 0;
+ for(j = 0; j < 4; j++) {
+ if(*src == '=') {
+ x <<= 6;
+ src++;
+ if(++padc > padding)
+ /* this is a badly placed '=' symbol! */
+ goto bad;
+ }
+ else {
+ val = lookup[(unsigned char)*src++];
+ if(val == 0xff) /* bad symbol */
+ goto bad;
+ x = (x << 6) | val;
+ }
+ }
+ if(padding == 1)
+ pos[1] = (x >> 8) & 0xff;
+ pos[0] = (x >> 16) & 0xff;
+ pos += 3 - padding;
+ }
+
+ /* Zero terminate */
+ *pos = '\0';
+
+ /* Return the decoded data */
+ *outptr = newstr;
+ *outlen = rawlen;
+
+ return CURLE_OK;
+bad:
+ free(newstr);
+ return CURLE_BAD_CONTENT_ENCODING;
+}
+
+static CURLcode base64_encode(const char *table64,
+ const char *inputbuff, size_t insize,
+ char **outptr, size_t *outlen)
+{
+ char *output;
+ char *base64data;
+ const unsigned char *in = (unsigned char *)inputbuff;
+ const char *padstr = &table64[64]; /* Point to padding string. */
+
+ *outptr = NULL;
+ *outlen = 0;
+
+ if(!insize)
+ insize = strlen(inputbuff);
+
+#if SIZEOF_SIZE_T == 4
+ if(insize > UINT_MAX/4)
+ return CURLE_OUT_OF_MEMORY;
+#endif
+
+ base64data = output = malloc((insize + 2) / 3 * 4 + 1);
+ if(!output)
+ return CURLE_OUT_OF_MEMORY;
+
+ while(insize >= 3) {
+ *output++ = table64[ in[0] >> 2 ];
+ *output++ = table64[ ((in[0] & 0x03) << 4) | (in[1] >> 4) ];
+ *output++ = table64[ ((in[1] & 0x0F) << 2) | ((in[2] & 0xC0) >> 6) ];
+ *output++ = table64[ in[2] & 0x3F ];
+ insize -= 3;
+ in += 3;
+ }
+ if(insize) {
+ /* this is only one or two bytes now */
+ *output++ = table64[ in[0] >> 2 ];
+ if(insize == 1) {
+ *output++ = table64[ ((in[0] & 0x03) << 4) ];
+ if(*padstr) {
+ *output++ = *padstr;
+ *output++ = *padstr;
+ }
+ }
+ else {
+ /* insize == 2 */
+ *output++ = table64[ ((in[0] & 0x03) << 4) | ((in[1] & 0xF0) >> 4) ];
+ *output++ = table64[ ((in[1] & 0x0F) << 2) ];
+ if(*padstr)
+ *output++ = *padstr;
+ }
+ }
+
+ /* Zero terminate */
+ *output = '\0';
+
+ /* Return the pointer to the new data (allocated memory) */
+ *outptr = base64data;
+
+ /* Return the length of the new data */
+ *outlen = output - base64data;
+
+ return CURLE_OK;
+}
+
+/*
+ * 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.
+ *
+ * @unittest: 1302
+ */
+CURLcode Curl_base64_encode(const char *inputbuff, size_t insize,
+ char **outptr, size_t *outlen)
+{
+ return base64_encode(base64encdec, 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.
+ *
+ * @unittest: 1302
+ */
+CURLcode Curl_base64url_encode(const char *inputbuff, size_t insize,
+ char **outptr, size_t *outlen)
+{
+ return base64_encode(base64url, inputbuff, insize, outptr, outlen);
+}
+
+#endif /* no users so disabled */
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