src/shared/Auth/Hmac.cpp

   1 /*
   2  * Copyright (C) 2005-2008 MaNGOS <http://getmangos.com/>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include "Auth/Hmac.h"
  20 #include "BigNumber.h"
  21
  22 HmacHash::HmacHash()
  23 {
  24     uint8 temp[SEED_KEY_SIZE] = { 0x38, 0xA7, 0x83, 0x15, 0xF8, 0x92, 0x25, 0x30, 0x71, 0x98, 0x67, 0xB1, 0x8C, 0x4, 0xE2, 0xAA };
  25     memcpy(&m_key, &temp, SEED_KEY_SIZE);
  26     HMAC_CTX_init(&m_ctx);
  27     HMAC_Init_ex(&m_ctx, &m_key, SEED_KEY_SIZE, EVP_sha1(), NULL);
  28 }
  29
  30 HmacHash::~HmacHash()
  31 {
  32     memset(&m_key, 0x00, SEED_KEY_SIZE);
  33     HMAC_CTX_cleanup(&m_ctx);
  34 }
  35
  36 void HmacHash::UpdateBigNumber(BigNumber *bn)
  37 {
  38     UpdateData(bn->AsByteArray(), bn->GetNumBytes());
  39 }
  40
  41 void HmacHash::UpdateData(const uint8 *data, int length)
  42 {
  43     HMAC_Update(&m_ctx, data, length);
  44 }
  45
  46 void HmacHash::Initialize()
  47 {
  48     HMAC_Init_ex(&m_ctx, &m_key, SEED_KEY_SIZE, EVP_sha1(), NULL);
  49 }
  50
  51 void HmacHash::Finalize()
  52 {
  53     uint32 length = 0;
  54     HMAC_Final(&m_ctx, m_digest, &length);
  55     ASSERT(length == SHA_DIGEST_LENGTH)
  56 }