usr/src/lib/libndmp/common/libndmp_base64.c

   1 /*
   2  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*
   7  * BSD 3 Clause License
   8  *
   9  * Copyright (c) 2007, The Storage Networking Industry Association.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *      - Redistributions of source code must retain the above copyright
  15  *        notice, this list of conditions and the following disclaimer.
  16  *
  17  *      - Redistributions in binary form must reproduce the above copyright
  18  *        notice, this list of conditions and the following disclaimer in
  19  *        the documentation and/or other materials provided with the
  20  *        distribution.
  21  *
  22  *      - Neither the name of The Storage Networking Industry Association (SNIA)
  23  *        nor the names of its contributors may be used to endorse or promote
  24  *        products derived from this software without specific prior written
  25  *        permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  28  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  31  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  */
  39 /* Copyright 2014 Nexenta Systems, Inc.  All rights reserved. */
  40
  41 #include <stdio.h>
  42 #include <sys/types.h>
  43 #include <string.h>
  44 #include <ctype.h>
  45 #include <stdlib.h>
  46 #include <libndmp.h>
  47
  48 #define NDMP_ENC_LEN    1024
  49 #define NDMP_DEC_LEN    256
  50
  51 static boolean_t ndmp_is_base64(unsigned char);
  52
  53 static char *b64_data =
  54         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  55
  56 static boolean_t
  57 ndmp_is_base64(unsigned char c)
  58 {
  59         return (isalnum(c) || (c == '+') || (c == '/'));
  60 }
  61
  62 /* caller should use the encoded string and then free the string. */
  63 char *
  64 ndmp_base64_encode(const char *str_to_encode)
  65 {
  66         int ret_cnt = 0;
  67         int i = 0, j = 0;
  68         char arr_3[3], arr_4[4];
  69         int len = strlen(str_to_encode);
  70         char *ret = malloc(NDMP_ENC_LEN);
  71
  72         if (ret == NULL) {
  73                 ndmp_errno = ENDMP_MEM_ALLOC;
  74                 return (NULL);
  75         }
  76
  77         while (len--) {
  78                 arr_3[i++] = *(str_to_encode++);
  79                 if (i == 3) {
  80                         arr_4[0] = (arr_3[0] & 0xfc) >> 2;
  81                         arr_4[1] = ((arr_3[0] & 0x03) << 4) +
  82                             ((arr_3[1] & 0xf0) >> 4);
  83                         arr_4[2] = ((arr_3[1] & 0x0f) << 2) +
  84                             ((arr_3[2] & 0xc0) >> 6);
  85                         arr_4[3] = arr_3[2] & 0x3f;
  86
  87                         for (i = 0; i < 4; i++)
  88                                 ret[ret_cnt++] = b64_data[arr_4[i]];
  89                         i = 0;
  90                 }
  91         }
  92
  93         if (i) {
  94                 for (j = i; j < 3; j++)
  95                         arr_3[j] = '\0';
  96
  97                 arr_4[0] = (arr_3[0] & 0xfc) >> 2;
  98                 arr_4[1] = ((arr_3[0] & 0x03) << 4) +
  99                     ((arr_3[1] & 0xf0) >> 4);
 100                 arr_4[2] = ((arr_3[1] & 0x0f) << 2) +
 101                     ((arr_3[2] & 0xc0) >> 6);
 102                 arr_4[3] = arr_3[2] & 0x3f;
 103
 104                 for (j = 0; j < (i + 1); j++)
 105                         ret[ret_cnt++] = b64_data[arr_4[j]];
 106
 107                 while (i++ < 3)
 108                         ret[ret_cnt++] = '=';
 109         }
 110
 111         ret[ret_cnt++] = '\0';
 112         return (ret);
 113 }
 114
 115 char *
 116 ndmp_base64_decode(const char *encoded_str)
 117 {
 118         int len = strlen(encoded_str);
 119         int i = 0, j = 0;
 120         int en_ind = 0;
 121         char arr_4[4], arr_3[3];
 122         int ret_cnt = 0;
 123         char *ret = malloc(NDMP_DEC_LEN);
 124         char *p;
 125
 126         if (ret == NULL) {
 127                 ndmp_errno = ENDMP_MEM_ALLOC;
 128                 return (NULL);
 129         }
 130
 131         while (len-- && (encoded_str[en_ind] != '=') &&
 132             ndmp_is_base64(encoded_str[en_ind])) {
 133                 arr_4[i++] = encoded_str[en_ind];
 134                 en_ind++;
 135                 if (i == 4) {
 136                         for (i = 0; i < 4; i++) {
 137                                 if ((p = strchr(b64_data, arr_4[i])) == NULL) {
 138                                         free(ret);
 139                                         return (NULL);
 140                                 }
 141
 142                                 arr_4[i] = (int)(p - b64_data);
 143                         }
 144
 145                         arr_3[0] = (arr_4[0] << 2) +
 146                             ((arr_4[1] & 0x30) >> 4);
 147                         arr_3[1] = ((arr_4[1] & 0xf) << 4) +
 148                             ((arr_4[2] & 0x3c) >> 2);
 149                         arr_3[2] = ((arr_4[2] & 0x3) << 6) +
 150                             arr_4[3];
 151
 152                         for (i = 0; i < 3; i++)
 153                                 ret[ret_cnt++] = arr_3[i];
 154
 155                         i = 0;
 156                 }
 157         }
 158
 159         if (i) {
 160                 for (j = i; j < 4; j++)
 161                         arr_4[j] = 0;
 162
 163                 for (j = 0; j < 4; j++) {
 164                         if ((p = strchr(b64_data, arr_4[j])) == NULL) {
 165                                 free(ret);
 166                                 return (NULL);
 167                         }
 168
 169                         arr_4[j] = (int)(p - b64_data);
 170                 }
 171                 arr_3[0] = (arr_4[0] << 2) +
 172                     ((arr_4[1] & 0x30) >> 4);
 173                 arr_3[1] = ((arr_4[1] & 0xf) << 4) +
 174                     ((arr_4[2] & 0x3c) >> 2);
 175                 arr_3[2] = ((arr_4[2] & 0x3) << 6) +
 176                     arr_4[3];
 177                 for (j = 0; j < (i - 1); j++)
 178                         ret[ret_cnt++] = arr_3[j];
 179         }
 180
 181         ret[ret_cnt++] = '\0';
 182         return (ret);
 183 }