ext/ipp/sources/ippcp/pcphashupdate_rmf.c

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/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     Security Hash Standard
//     Generalized Functionality
// 
//  Contents:
//        ippsHashUpdate_rmf()
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcphash_rmf.h"
#include "pcptool.h"

/*F*
//    Name: ippsHashUpdate_rmf
//
// Purpose: Updates intermediate hash value based on input stream.
//
// Returns:                   Reason:
//    ippStsNullPtrErr           pState == NULL
//    ippStsNullPtrErr           pSrc==0 but len!=0
//    ippStsContextMatchErr      pState->idCtx != idCtxHash
//    ippStsLengthErr            len <0
//    ippStsNoErr                no errors
//
// Parameters:
//    pSrc     pointer to the input stream
//    len      input stream length
//    pState   pointer to the Hash context
//
*F*/
IPPFUN(IppStatus, ippsHashUpdate_rmf,(const Ipp8u* pSrc, int len, IppsHashState_rmf* pState))
{
   /* test state pointer and ID */
   IPP_BAD_PTR1_RET(pState);
   pState= (IppsHashState_rmf*)( IPP_ALIGNED_PTR(pState, HASH_ALIGNMENT) );
   IPP_BADARG_RET(idCtxHash !=HASH_CTX_ID(pState), ippStsContextMatchErr);

   /* test input length */
   IPP_BADARG_RET((len<0), ippStsLengthErr);
   /* test source pointer */
   IPP_BADARG_RET((len && !pSrc), ippStsNullPtrErr);

   if(len) {
      const IppsHashMethod* method = HASH_METHOD(pState);
      hashUpdateF hashFunc = method->hashUpdate;   /* processing function */
      int msgBlkSize = method->msgBlkSize;         /* messge block size */

      int procLen;

      int idx = HAHS_BUFFIDX(pState);
      Ipp64u lenLo = HASH_LENLO(pState);
      Ipp64u lenHi = HASH_LENHI(pState);
      lenLo += len;
      if(lenLo < HASH_LENLO(pState)) lenHi++;

      /* if internal buffer is not empty */
      if(idx) {
         procLen = IPP_MIN(len, (msgBlkSize-idx));
         CopyBlock(pSrc, HASH_BUFF(pState)+idx, procLen);
         idx += procLen;

         /* process complete message block  */
         if(msgBlkSize==idx) {
            hashFunc(HASH_VALUE(pState), HASH_BUFF(pState), msgBlkSize);
            idx = 0;
         }

         /* update message pointer and length */
         pSrc += procLen;
         len  -= procLen;
      }

      /* process main part of the input*/
      procLen = len & ~(msgBlkSize-1);
      if(procLen) {
         hashFunc(HASH_VALUE(pState), pSrc, procLen);
         pSrc += procLen;
         len  -= procLen;
      }

      /* store the rest of input in the buffer */
      if(len) {
         CopyBlock(pSrc, HASH_BUFF(pState), len);
         idx += len;
      }

      /* update length of processed message */
      HASH_LENLO(pState) = lenLo;
      HASH_LENHI(pState) = lenHi;
      HAHS_BUFFIDX(pState) = idx;
   }

   return ippStsNoErr;
}