CASymCipherGCM.cpp

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/*
Copyright (c) 2000, The JAP-Team
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
 
  - Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.
 
  - Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation and/or
    other materials provided with the distribution.
 
  - Neither the name of the University of Technology Dresden, Germany nor the names of its contributors
    may be used to endorse or promote products derived from this software without specific
    prior written permission.
 
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*/
#include "StdAfx.h"
#include "CASymCipherGCM.hpp"
#include "CAMsg.hpp"
//AES GCM
 
/*
void CASymCipherGCM::setGCMKeys(UINT8* keyRecv, UINT8* keySend)
{
 
#ifndef USE_OPENSSL_GCM
  m_pGCMCtxEnc = new gcm_ctx_64k;
  m_pGCMCtxDec = new gcm_ctx_64k;
#else
  //Note the have to provide *some* key (OpenSSL API enforced --> so the use the variables we have anyway..)
  // The Key will be overriden by a call to setKeyGCM in any case!
  AES_set_encrypt_key(m_iv1,128,m_keyAES1);
  m_pGCMCtxEnc = CRYPTO_gcm128_new(m_keyAES1,(block128_f)AES_encrypt);
  m_pGCMCtxDec = CRYPTO_gcm128_new(m_keyAES1,(block128_f)AES_encrypt);
#endif
 
 
 
#ifndef USE_OPENSSL_GCM
  if(m_pGCMCtxDec!=NULL)
    delete m_pGCMCtxDec;
  if(m_pGCMCtxEnc!=NULL)
    delete m_pGCMCtxEnc;
 
  m_pGCMCtxEnc = new gcm_ctx_64k;
  m_pGCMCtxDec = new gcm_ctx_64k;
  gcm_init_64k(m_pGCMCtxEnc, keySend, 128);
  gcm_init_64k(m_pGCMCtxDec, keyRecv, 128);
#else
  AES_set_encrypt_key(keyRecv,128,m_keyAES1);
  AES_set_encrypt_key(keySend,128,m_keyAES2);
  CRYPTO_gcm128_release(m_pGCMCtxEnc);
  CRYPTO_gcm128_release(m_pGCMCtxDec);
  m_pGCMCtxEnc=CRYPTO_gcm128_new(m_keyAES2,(block128_f)AES_encrypt);
  m_pGCMCtxDec=CRYPTO_gcm128_new(m_keyAES1,(block128_f)AES_encrypt);
#endif
  //reset IV
  m_nEncMsgCounter = 0;
  memset(m_pEncMsgIV, 0, 12);
  m_nDecMsgCounter = 0;
  memset(m_pDecMsgIV, 0, 12);
}
*/
/*
SINT32 CASymCipherGCM::encryptMessage(const UINT8* const in, UINT32 inlen, UINT8* out)
{
  #ifdef NO_ENCRYPTION
  memmove(out, in, inlen);
  return E_SUCCESS;
#endif
 
  //m_pcsEnc->lock();
  m_pEncMsgIV[2] = htonl(m_nEncMsgCounter);
  m_nEncMsgCounter++;
#ifndef USE_OPENSSL_GCM
  gcm_encrypt_64k(m_pGCMCtxEnc, m_pEncMsgIV, in, inlen, out, (UINT32*)(out + inlen));
#else
  CRYPTO_gcm128_setiv(m_pGCMCtxEnc,(UINT8*)m_pEncMsgIV,12);
  CRYPTO_gcm128_encrypt(m_pGCMCtxEnc,in,out,inlen);
  CRYPTO_gcm128_tag(m_pGCMCtxEnc,out+inlen,16);
#endif
  //m_pcsEnc->unlock();
  return E_SUCCESS;
}
*/
/*
SINT32 CASymCipherGCM::decryptMessage(const UINT8* in, UINT32 inlen, UINT8* out, bool integrityCheck)
{
#ifdef NO_ENCRYPTION
  memmove(out, in, inlen);
  return E_SUCCESS;
#endif
 
  SINT32 ret = E_UNKNOWN;
  //m_pcsDec->lock();
  m_pDecMsgIV[2] = htonl(m_nDecMsgCounter);
  if (integrityCheck)
    {
      m_nDecMsgCounter++;
#ifndef USE_OPENSSL_GCM
      ret = ::gcm_decrypt_64k(m_pGCMCtxDec, m_pDecMsgIV, in, inlen - 16, in + inlen - 16, out);
#else
      CRYPTO_gcm128_setiv(m_pGCMCtxDec,(UINT8*)m_pDecMsgIV,12);
      CRYPTO_gcm128_decrypt(m_pGCMCtxDec,in,out,inlen-16);
      ret=CRYPTO_gcm128_finish(m_pGCMCtxDec,in + inlen - 16,16);
#endif
    }
  else
    {
#ifndef USE_OPENSSL_GCM
      ret = ::gcm_decrypt_64k(m_pGCMCtxDec, m_pDecMsgIV, in, inlen, out);
#else
      CRYPTO_gcm128_setiv(m_pGCMCtxDec,(UINT8*)m_pDecMsgIV,12);
      ret=CRYPTO_gcm128_decrypt(m_pGCMCtxDec,in,out,inlen);
#endif
    }
  //m_pcsDec->unlock();
#ifndef USE_OPENSSL_GCM
  if(ret==0)
#else
  if(ret!=0)
#endif
    return E_UNKNOWN;
  return E_SUCCESS;
}
*/