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     40 
     41 /*
     42 //  Purpose:
     43 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
     44 //     Unsigned internal BNU32 misc functionality
     45 //
     46 //  Contents:
     47 //     cpToOctStr_BNU32()
     48 //
     49 */
     50 
     51 #include "owncp.h"
     52 #include "pcpbnuimpl.h"
     53 #include "pcpbnumisc.h"
     54 #include "pcpbnu32misc.h"
     55 
     56 /*F*
     57 //    Name: cpFromOctStr_BNU32
     58 //
     59 // Purpose: Convert Oct String into BNU representation.
     60 //
     61 // Returns:
     62 //          size of BNU in BNU_CHUNK_T chunks
     63 //
     64 // Parameters:
     65 //    pOctStr     pointer to the source octet string
     66 //    strLen      octet string length
     67 //    pBNU        pointer to the target BN
     68 //
     69 *F*/
     70 
     71 cpSize cpFromOctStr_BNU32(Ipp32u* pBNU, const Ipp8u* pOctStr, cpSize strLen)
     72 {
     73    cpSize bnuSize=0;
     74    *pBNU = 0;
     75 
     76    /* start from the end of string */
     77    for(; strLen>=4; bnuSize++,strLen-=4) {
     78       /* pack 4 bytes into single Ipp32u value*/
     79       *pBNU++ = ( pOctStr[strLen-4]<<(8*3) )
     80                +( pOctStr[strLen-3]<<(8*2) )
     81                +( pOctStr[strLen-2]<<(8*1) )
     82                +  pOctStr[strLen-1];
     83    }
     84 
     85    /* convert the beginning of the string */
     86    if(strLen) {
     87       Ipp32u x;
     88       for(x=0; strLen>0; strLen--) {
     89          Ipp32u d = *pOctStr++;
     90          x = x*256 + d;
     91        }
     92        *pBNU++ = x;
     93        bnuSize++;
     94    }
     95 
     96    return bnuSize? bnuSize : 1;
     97 }
     98