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  /* 
  //  Purpose:
  //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
  //     Unsigned internal BNU32 misc functionality
  // 
  //  Contents:
  //     cpToOctStr_BNU32()
  // 
  */
  
  #include "owncp.h"
  #include "pcpbnuimpl.h"
  #include "pcpbnumisc.h"
  #include "pcpbnu32misc.h"
  
  /*F*
  //    Name: cpFromOctStr_BNU32
  //
  // Purpose: Convert Oct String into BNU representation.
  //
  // Returns:
  //          size of BNU in BNU_CHUNK_T chunks
  //
  // Parameters:
  //    pOctStr     pointer to the source octet string
  //    strLen      octet string length
  //    pBNU        pointer to the target BN
  //
  *F*/
  
  cpSize cpFromOctStr_BNU32(Ipp32u* pBNU, const Ipp8u* pOctStr, cpSize strLen)
  {
     cpSize bnuSize=0;
     *pBNU = 0;
  
     /* start from the end of string */
     for(; strLen>=4; bnuSize++,strLen-=4) {
        /* pack 4 bytes into single Ipp32u value*/
        *pBNU++ = ( pOctStr[strLen-4]<<(8*3) )
                 +( pOctStr[strLen-3]<<(8*2) )
                 +( pOctStr[strLen-2]<<(8*1) )
                 +  pOctStr[strLen-1];
     }
  
     /* convert the beginning of the string */
     if(strLen) {
        Ipp32u x;
        for(x=0; strLen>0; strLen--) {
           Ipp32u d = *pOctStr++;
           x = x*256 + d;
         }
         *pBNU++ = x;
         bnuSize++;
     }
  
     return bnuSize? bnuSize : 1;
  }
  