libndmp/common/libndmp_base64.c

2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar/*
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * Use is subject to license terms.
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar */
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar/*
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * BSD 3 Clause License
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * Copyright (c) 2007, The Storage Networking Industry Association.
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * Redistribution and use in source and binary forms, with or without
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * modification, are permitted provided that the following conditions
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * are met:
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *  - Redistributions of source code must retain the above copyright
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *    notice, this list of conditions and the following disclaimer.
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *  - Redistributions in binary form must reproduce the above copyright
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *    notice, this list of conditions and the following disclaimer in
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *    the documentation and/or other materials provided with the
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *    distribution.
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *  - Neither the name of The Storage Networking Industry Association (SNIA)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *    nor the names of its contributors may be used to endorse or promote
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *    products derived from this software without specific prior written
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *    permission.
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar *
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar * POSSIBILITY OF SUCH DAMAGE.
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar */
8b87c15576a5138f88a969448b43561bf5968c09Jan Kryl/* Copyright 2014 Nexenta Systems, Inc.  All rights reserved. */
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar#include <stdio.h>
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar#include <sys/types.h>
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar#include <string.h>
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar#include <ctype.h>
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar#include <stdlib.h>
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar#include <libndmp.h>
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar#define NDMP_ENC_LEN    1024
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar#define NDMP_DEC_LEN    256
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdarstatic boolean_t ndmp_is_base64(unsigned char);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdarstatic char *b64_data =
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdarstatic boolean_t
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdarndmp_is_base64(unsigned char c)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar{
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    return (isalnum(c) || (c == '+') || (c == '/'));
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar}
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
8b87c15576a5138f88a969448b43561bf5968c09Jan Kryl/* caller should use the encoded string and then free the string. */
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdarchar *
8b87c15576a5138f88a969448b43561bf5968c09Jan Krylndmp_base64_encode(const char *str_to_encode)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar{
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    int ret_cnt = 0;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    int i = 0, j = 0;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    char arr_3[3], arr_4[4];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    int len = strlen(str_to_encode);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    char *ret = malloc(NDMP_ENC_LEN);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    if (ret == NULL) {
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        ndmp_errno = ENDMP_MEM_ALLOC;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        return (NULL);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    while (len--) {
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_3[i++] = *(str_to_encode++);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        if (i == 3) {
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_4[0] = (arr_3[0] & 0xfc) >> 2;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_4[1] = ((arr_3[0] & 0x03) << 4) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                ((arr_3[1] & 0xf0) >> 4);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_4[2] = ((arr_3[1] & 0x0f) << 2) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                ((arr_3[2] & 0xc0) >> 6);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_4[3] = arr_3[2] & 0x3f;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            for (i = 0; i < 4; i++)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                ret[ret_cnt++] = b64_data[arr_4[i]];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            i = 0;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    if (i) {
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        for (j = i; j < 3; j++)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_3[j] = '\0';
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_4[0] = (arr_3[0] & 0xfc) >> 2;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_4[1] = ((arr_3[0] & 0x03) << 4) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            ((arr_3[1] & 0xf0) >> 4);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_4[2] = ((arr_3[1] & 0x0f) << 2) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            ((arr_3[2] & 0xc0) >> 6);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_4[3] = arr_3[2] & 0x3f;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        for (j = 0; j < (i + 1); j++)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            ret[ret_cnt++] = b64_data[arr_4[j]];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        while (i++ < 3)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            ret[ret_cnt++] = '=';
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    ret[ret_cnt++] = '\0';
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    return (ret);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar}
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdarchar *
8b87c15576a5138f88a969448b43561bf5968c09Jan Krylndmp_base64_decode(const char *encoded_str)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar{
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    int len = strlen(encoded_str);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    int i = 0, j = 0;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    int en_ind = 0;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    char arr_4[4], arr_3[3];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    int ret_cnt = 0;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    char *ret = malloc(NDMP_DEC_LEN);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    char *p;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    if (ret == NULL) {
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        ndmp_errno = ENDMP_MEM_ALLOC;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        return (NULL);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    while (len-- && (encoded_str[en_ind] != '=') &&
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        ndmp_is_base64(encoded_str[en_ind])) {
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_4[i++] = encoded_str[en_ind];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        en_ind++;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        if (i == 4) {
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            for (i = 0; i < 4; i++) {
8b87c15576a5138f88a969448b43561bf5968c09Jan Kryl                if ((p = strchr(b64_data, arr_4[i])) == NULL) {
8b87c15576a5138f88a969448b43561bf5968c09Jan Kryl                    free(ret);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                    return (NULL);
8b87c15576a5138f88a969448b43561bf5968c09Jan Kryl                }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                arr_4[i] = (int)(p - b64_data);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_3[0] = (arr_4[0] << 2) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                ((arr_4[1] & 0x30) >> 4);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_3[1] = ((arr_4[1] & 0xf) << 4) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                ((arr_4[2] & 0x3c) >> 2);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_3[2] = ((arr_4[2] & 0x3) << 6) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                arr_4[3];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            for (i = 0; i < 3; i++)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                ret[ret_cnt++] = arr_3[i];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            i = 0;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    if (i) {
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        for (j = i; j < 4; j++)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_4[j] = 0;
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        for (j = 0; j < 4; j++) {
8b87c15576a5138f88a969448b43561bf5968c09Jan Kryl            if ((p = strchr(b64_data, arr_4[j])) == NULL) {
8b87c15576a5138f88a969448b43561bf5968c09Jan Kryl                free(ret);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar                return (NULL);
8b87c15576a5138f88a969448b43561bf5968c09Jan Kryl            }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_4[j] = (int)(p - b64_data);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_3[0] = (arr_4[0] << 2) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            ((arr_4[1] & 0x30) >> 4);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_3[1] = ((arr_4[1] & 0xf) << 4) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            ((arr_4[2] & 0x3c) >> 2);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        arr_3[2] = ((arr_4[2] & 0x3) << 6) +
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            arr_4[3];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar        for (j = 0; j < (i - 1); j++)
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar            ret[ret_cnt++] = arr_3[j];
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    }
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    ret[ret_cnt++] = '\0';
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar    return (ret);
2654012f83cec5dc15b61dfe3e4a4915f186e7a6Reza Sabdar}