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.getLength() == 0)
  40                 {
  41                         return ret;
  42                 }
  43
  44                 b64 = BIO_new(BIO_f_base64());
  45                 bmem = BIO_new(BIO_s_mem());
  46
  47                 if (newLineChar == false)
  48                         BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
  49
  50                 b64 = BIO_push(b64, bmem);
  51
  52                 BIO_write(b64, buffer.getBuffer(), buffer.getLength());
  53                 BIO_flush(b64);
  54                 BIO_get_mem_ptr(b64, &bptr);
  55
  56                 result.setBuffer((unsigned char *)bptr->data, bptr->length);
  57
  58                 BIO_free_all(b64);
  59
  60                 ret = true;
  61
  62                 return ret;
  63         }
  64
  65         bool OpensslHelper::decodeBase64String(const char *buffer, ByteArray &result, bool newLineChar)
  66         {
  67                 ByteArray temp;
  68
  69                 temp.setBuffer((unsigned char *)buffer, strlen(buffer));
  70
  71                 return decodeBase64String(temp, result, newLineChar);
  72         }
  73
  74         bool OpensslHelper::decodeBase64String(const ByteArray &buffer, ByteArray &result, bool newLineChar)
  75         {
  76                 bool ret = false;
  77                 unsigned int length = 0;
  78                 char *temp;
  79
  80                 if (buffer.getBuffer() == NULL || buffer.getLength() == 0)
  81                 {
  82                         return ret;
  83                 }
  84
  85                 length = buffer.getLength();
  86
  87                 temp = new char[length];
  88                 if (temp != NULL)
  89                 {
  90                         BIO *b64, *bmem;
  91
  92                         memset(temp, 0, length);
  93
  94                         b64 = BIO_new(BIO_f_base64());
  95                         bmem = BIO_new_mem_buf(buffer.getBuffer(), length);
  96                         if (newLineChar == false)
  97                                 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
  98                         bmem = BIO_push(b64, bmem);
  99
 100                         length = BIO_read(bmem, temp, length);
 101
 102                         BIO_free_all(bmem);
 103
 104                         result.setBuffer((unsigned char *)temp, length);
 105
 106                         delete []temp;
 107
 108                         ret = true;
 109                 }
 110                 else
 111                 {
 112                         SCARD_DEBUG_ERR("alloc failed");
 113                 }
 114
 115                 return ret;
 116         }
 117
 118         bool OpensslHelper::digestBuffer(const char *algorithm, const uint8_t *buffer, const uint32_t length, ByteArray &result)
 119         {
 120                 ByteArray temp((uint8_t *)buffer, (uint32_t)length);
 121
 122                 return digestBuffer(algorithm, temp, result);
 123         }
 124
 125         bool OpensslHelper::digestBuffer(const char *algorithm, const ByteArray &buffer, ByteArray &result)
 126         {
 127                 const EVP_MD *md;
 128                 bool ret = false;
 129
 130                 if (algorithm == NULL || buffer.getLength() == 0)
 131                 {
 132                         return ret;
 133                 }
 134
 135                 OpenSSL_add_all_digests();
 136
 137                 if ((md = EVP_get_digestbyname(algorithm)) != NULL)
 138                 {
 139                         uint8_t temp[EVP_MAX_MD_SIZE] = { 0, };
 140                         EVP_MD_CTX mdCtx;
 141                         unsigned int resultLen = 0;
 142
 143                         if (EVP_DigestInit(&mdCtx, md) > 0)
 144                         {
 145                                 if (EVP_DigestUpdate(&mdCtx, buffer.getBuffer(), buffer.getLength()) == 0)
 146                                 {
 147                                         SCARD_DEBUG_ERR("EVP_DigestUpdate failed");
 148                                 }
 149
 150                                 if (EVP_DigestFinal(&mdCtx, temp, &resultLen) > 0 &&
 151                                         resultLen > 0)
 152                                 {
 153                                         result.setBuffer(temp, resultLen);
 154                                         ret = true;
 155                                 }
 156                         }
 157                 }
 158                 else
 159                 {
 160                         SCARD_DEBUG_ERR("EVP_get_digestbyname(\"%s\") returns NULL", algorithm);
 161                 }
 162
 163                 return ret;
 164         }
 165
 166 } /* namespace smartcard_service_api */