ext/ipp/sources/ippcp/pcpsha256ca.c

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/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     Digesting message according to SHA256
// 
//  Contents:
//     cpFinalizeSHA256()
// 
// 
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcphash.h"
#include "pcphash_rmf.h"
#include "pcptool.h"
#include "pcpsha256stuff.h"

void cpFinalizeSHA256(DigestSHA256 pHash, const Ipp8u* inpBuffer, int inpLen, Ipp64u processedMsgLen)
{
   /* select processing  function */
   #if (_SHA_NI_ENABLING_==_FEATURE_ON_)
   cpHashProc updateFunc = UpdateSHA256ni;
   #elif (_SHA_NI_ENABLING_==_FEATURE_TICKTOCK_)
   cpHashProc updateFunc = IsFeatureEnabled(ippCPUID_SHA)? UpdateSHA256ni : UpdateSHA256;
   #else
   cpHashProc updateFunc = UpdateSHA256;
   #endif

   /* local buffer and it length */
   Ipp8u buffer[MBS_SHA256*2];
   int bufferLen = inpLen < (MBS_SHA256-(int)MLR_SHA256)? MBS_SHA256 : MBS_SHA256*2; 

   /* copy rest of message into internal buffer */
   CopyBlock(inpBuffer, buffer, inpLen);

   /* padd message */
   buffer[inpLen++] = 0x80;
   PaddBlock(0, buffer+inpLen, bufferLen-inpLen-MLR_SHA256);

   /* put processed message length in bits */
   processedMsgLen = ENDIANNESS64(processedMsgLen<<3);
   ((Ipp64u*)(buffer+bufferLen))[-1] = processedMsgLen;

   /* copmplete hash computation */
   updateFunc(pHash, buffer, bufferLen, sha256_cnt);
}