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/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     SMS4 encryption/decryption
// 
//  Contents:
//        cpEncryptSMS4_cbc()
//
*/

#include "owncp.h"
#include "pcpsms4.h"
#include "pcptool.h"

#if !defined _PCP_SMS4_ENCRYPT_CBC_H
#define _PCP_SMS4_ENCRYPT_CBC_H

/*F*
//    Name: ippsSMS4EncryptCBC
//
// Purpose: SMS4-CBC encryption.
//
// Returns:                Reason:
//    ippStsNullPtrErr        pCtx == NULL
//                            pSrc == NULL
//                            pDst == NULL
//                            pIV  == NULL
//    ippStsContextMatchErr   !VALID_SMS_ID()
//    ippStsLengthErr         len <1
//    ippStsUnderRunErr       0!=(dataLen%MBS_SMS4)
//    ippStsNoErr             no errors
//
// Parameters:
//    pSrc        pointer to the source data buffer
//    pDst        pointer to the target data buffer
//    dataLen     input/output buffer length (in bytes)
//    pCtx        pointer to the SMS4 context
//    pIV         pointer to the initialization vector
//
*F*/
static void cpEncryptSMS4_cbc(const Ipp8u* pIV,
                              const Ipp8u* pSrc, Ipp8u* pDst, int dataLen,
                              const IppsSMS4Spec* pCtx)
{
   const Ipp32u* pRoundKeys = SMS4_RK(pCtx);

   /* read IV */
   Ipp32u iv[MBS_SMS4/sizeof(Ipp32u)];
   CopyBlock16(pIV, iv);

   /* do encryption */
   for(; dataLen>0; dataLen-=MBS_SMS4, pSrc+=MBS_SMS4, pDst+=MBS_SMS4) {
      iv[0] ^= ((Ipp32u*)pSrc)[0];
      iv[1] ^= ((Ipp32u*)pSrc)[1];
      iv[2] ^= ((Ipp32u*)pSrc)[2];
      iv[3] ^= ((Ipp32u*)pSrc)[3];

      cpSMS4_Cipher(pDst, (Ipp8u*)iv, pRoundKeys);

      iv[0] = ((Ipp32u*)pDst)[0];
      iv[1] = ((Ipp32u*)pDst)[1];
      iv[2] = ((Ipp32u*)pDst)[2];
      iv[3] = ((Ipp32u*)pDst)[3];
   }
}

#endif /* #if !defined _PCP_SMS4_ENCRYPT_CBC_H */