CASymCipher.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 "CASymCipher.hpp"
#include "CAMsg.hpp"
//AES
 
 
#ifdef AES_NI
extern "C"
  {
    int aesni_set_encrypt_key(const unsigned char *userKey, int bits,AES_KEY *key);
    int aesni_set_decrypt_key(const unsigned char *userKey, int bits,AES_KEY *key);
    void aesni_encrypt(const unsigned char *in, unsigned char *out,
                   const AES_KEY *key);
    void aesni_cbc_encrypt(const unsigned char *in,
                       unsigned char *out,
                       size_t length,
                       const AES_KEY *key, unsigned char *ivec, int enc);
  }
#endif
 
SINT32 CASymCipher::setKey(const UINT8* key)
{
  return setKey(key,true);
}
 
SINT32 CASymCipher::setKey(const UINT8* key,bool bEncrypt)
{
  memset(m_iv1,0,16);
#ifdef INTEL_IPP_CRYPTO
  ippsRijndael128Init(key, IppsRijndaelKey128,m_keyAES1);
#else
  if(bEncrypt)
    {
#ifdef AES_NI
  aesni_set_encrypt_key(key,128,m_keyAES1);
 
#else
  AES_set_encrypt_key(key,128,m_keyAES1);
#endif
    }
  else
    {
#ifdef AES_NI
      aesni_set_decrypt_key(key,128,m_keyAES1);
#else
      AES_set_decrypt_key(key,128,m_keyAES1);
#endif
    }
#endif
  m_bKeySet=true;
  return E_SUCCESS;
}
 
/*
SINT32 CASymCipher::setKeys(const UINT8* key,UINT32 keysize)
{
  if(keysize==KEY_SIZE)
    {
      return setKey(key);
    }
  else if(keysize==2*KEY_SIZE)
    {
#ifdef INTEL_IPP_CRYPTO
      ippsRijndael128Init(key, IppsRijndaelKey128,m_keyAES1);
      ippsRijndael128Init(key+KEY_SIZE, IppsRijndaelKey128,m_keyAES2);
#else
#ifdef AES_NI
      aesni_set_encrypt_key(key,128,m_keyAES1);
      aesni_set_encrypt_key(key+KEY_SIZE,128,m_keyAES2);
#else
      AES_set_encrypt_key(key,128,m_keyAES1);
#endif
#endif
      memset(m_iv1,0,16);
#ifdef SYM_CIPHER_CTR
  EVP_DecryptInit_ex(m_ctxAES1,EVP_aes_128_ctr(), NULL, key, m_iv1);
  EVP_EncryptInit_ex(m_ctxAES2, EVP_aes_128_ctr(), NULL, key+KEY_SIZE, m_iv2);
  memcpy(key1, key, 16);
  memcpy(key2, key + KEY_SIZE, 16);
#endif
      m_bKeySet=true;
      return E_SUCCESS;
    }
  return E_UNKNOWN;
}
*/
 
 
SINT32 CASymCipher::decryptCBCwithPKCS7(const UINT8* in,UINT8* out,UINT32* len)
{
  if(in==NULL||out==NULL||len==NULL||*len==0)
    return E_UNKNOWN;
#ifdef INTEL_IPP_CRYPTO
#else
#ifndef AES_NI
  AES_cbc_encrypt(in,out,*len,m_keyAES1,m_iv1,AES_DECRYPT);
#else
  aesni_cbc_encrypt(in,out,*len,m_keyAES1,m_iv1,AES_DECRYPT);
#endif
  //Now remove padding
  UINT32 pad=out[*len-1];
  if(pad>16||pad>*len)
    return E_UNKNOWN;
  for(UINT32 i=*len-pad; i<*len-1; i++)
    if(out[i]!=pad)
      return E_UNKNOWN;
  *len-=pad;
#endif
  return E_SUCCESS;
}
 
SINT32 CASymCipher::encryptCBCwithPKCS7(const UINT8* in,UINT32 inlen,UINT8* out,UINT32* len)
{
#ifdef INTEL_IPP_CRYPTO
#else
  UINT32 padlen=16-(inlen%16);
  if(inlen+padlen>(*len))
    {
      return E_SPACE;
    }
  UINT8* tmp=new UINT8[inlen+padlen];
  memcpy(tmp,in,inlen);
  for(UINT32 i=inlen; i<inlen+padlen; i++)
    {
      tmp[i]=(UINT8)padlen;
    }
#ifndef AES_NI
  AES_cbc_encrypt(tmp,out,inlen+padlen,m_keyAES1,m_iv1,AES_ENCRYPT);
#else
  aesni_cbc_encrypt(tmp,out,inlen+padlen,m_keyAES1,m_iv1,AES_ENCRYPT);
#endif
  delete[] tmp;
  tmp = NULL;
  *len=inlen+padlen;
#endif
  return E_SUCCESS;
}