common/OpensslHelper.cpp

   1 /*
   2  * Copyright (c) 2012, 2013 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 /* standard library header */
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <openssl/evp.h>
  21 #include <openssl/bio.h>
  22 #include <openssl/buffer.h>
  23
  24 /* SLP library header */
  25
  26 /* local header */
  27 #include "Debug.h"
  28 #include "ByteArray.h"
  29 #include "OpensslHelper.h"
  30
  31 namespace smartcard_service_api
  32 {
  33         bool OpensslHelper::encodeBase64String(const ByteArray &buffer, ByteArray &result, bool newLineChar)
  34         {
  35                 bool ret = false;
  36                 BUF_MEM *bptr;
  37                 BIO *b64, *bmem;
  38
  39                 if (buffer.size() == 0)
  40                 {
  41                         return ret;
  42                 }
  43
  44                 b64 = BIO_new(BIO_f_base64());
  45                 if(b64 == NULL)
  46                         return false;
  47
  48                 bmem = BIO_new(BIO_s_mem());
  49
  50                 if (newLineChar == false)
  51                         BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
  52
  53                 b64 = BIO_push(b64, bmem);
  54
  55                 BIO_write(b64, buffer.getBuffer(), buffer.size());
  56                 BIO_flush(b64);
  57                 BIO_get_mem_ptr(b64, &bptr);
  58
  59                 result.assign((unsigned char *)bptr->data, bptr->length);
  60
  61                 BIO_free_all(b64);
  62
  63                 ret = true;
  64
  65                 return ret;
  66         }
  67
  68         bool OpensslHelper::decodeBase64String(const char *buffer, ByteArray &result, bool newLineChar)
  69         {
  70                 ByteArray temp;
  71
  72                 temp.assign((unsigned char *)buffer, strlen(buffer));
  73
  74                 return decodeBase64String(temp, result, newLineChar);
  75         }
  76
  77         bool OpensslHelper::decodeBase64String(const ByteArray &buffer, ByteArray &result, bool newLineChar)
  78         {
  79                 bool ret = false;
  80                 unsigned int length = 0;
  81                 char *temp;
  82
  83                 if (buffer.getBuffer() == NULL || buffer.size() == 0)
  84                 {
  85                         return ret;
  86                 }
  87
  88                 length = buffer.size();
  89
  90                 temp = new char[length];
  91                 if (temp != NULL)
  92                 {
  93                         BIO *b64, *bmem;
  94
  95                         memset(temp, 0, length);
  96
  97                         b64 = BIO_new(BIO_f_base64());
  98                         if(b64 == NULL)
  99                         {
 100                                 delete []temp;
 101                                 return false;
 102                         }
 103
 104                         bmem = BIO_new_mem_buf((void *)buffer.getBuffer(), length);
 105                         if (newLineChar == false)
 106                                 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
 107                         bmem = BIO_push(b64, bmem);
 108
 109                         length = BIO_read(bmem, temp, length);
 110
 111                         BIO_free_all(bmem);
 112                         if(length > 0)
 113                         {
 114                                 result.assign((unsigned char *)temp, length);
 115                                 ret = true;
 116                         }
 117                         else
 118                         {
 119                                 ret = false;
 120                         }
 121
 122                         delete []temp;
 123                 }
 124                 else
 125                 {
 126                         _ERR("alloc failed");
 127                 }
 128
 129                 return ret;
 130         }
 131
 132         bool OpensslHelper::digestBuffer(const char *algorithm,
 133                 const uint8_t *buffer, uint32_t length, ByteArray &result)
 134         {
 135                 ByteArray temp(buffer, length);
 136
 137                 return digestBuffer(algorithm, temp, result);
 138         }
 139
 140         bool OpensslHelper::digestBuffer(const char *algorithm,
 141                 const ByteArray &buffer, ByteArray &result)
 142         {
 143                 const EVP_MD *md;
 144                 bool ret = false;
 145
 146                 if (algorithm == NULL || buffer.size() == 0)
 147                 {
 148                         return ret;
 149                 }
 150
 151                 OpenSSL_add_all_digests();
 152
 153                 if ((md = EVP_get_digestbyname(algorithm)) != NULL)
 154                 {
 155                         uint8_t temp[EVP_MAX_MD_SIZE] = { 0, };
 156                         EVP_MD_CTX mdCtx;
 157                         unsigned int resultLen = 0;
 158
 159                         if (EVP_DigestInit(&mdCtx, md) > 0)
 160                         {
 161                                 if (EVP_DigestUpdate(&mdCtx, buffer.getBuffer(), buffer.size()) == 0)
 162                                 {
 163                                         _ERR("EVP_DigestUpdate failed");
 164                                 }
 165
 166                                 if (EVP_DigestFinal(&mdCtx, temp, &resultLen) > 0 &&
 167                                         resultLen > 0)
 168                                 {
 169                                         result.assign(temp, resultLen);
 170                                         ret = true;
 171                                 }
 172                         }
 173                 }
 174                 else
 175                 {
 176                         _ERR("EVP_get_digestbyname(\"%s\") returns NULL", algorithm);
 177                 }
 178
 179                 return ret;
 180         }
 181
 182 } /* namespace smartcard_service_api */