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     40 
     41 /*
     42 //  Purpose:
     43 //     Cryptography Primitive.
     44 //     HASH based Mask Generation Functions
     45 //
     46 //  Contents:
     47 //        ippsMGF1_rmf()
     48 //
     49 */
     50 
     51 #include "owndefs.h"
     52 #include "owncp.h"
     53 #include "pcphash_rmf.h"
     54 #include "pcptool.h"
     55 
     56 /*F*
     57 //    Name: ippsMGF1
     58 //
     59 // Purpose: Mask Generation Functios.
     60 //
     61 // Returns:                Reason:
     62 //    ippStsNullPtrErr           pMask == NULL
     63 //                               pMethod ==NULL
     64 //    ippStsLengthErr            seedLen <0
     65 //                               maskLen <0
     66 //    ippStsNoErr                no errors
     67 //
     68 // Parameters:
     69 //    pSeed       pointer to the input stream
     70 //    seedLen     input stream length (bytes)
     71 //    pMaske      pointer to the ouput mask
     72 //    maskLen     desired length of mask (bytes)
     73 //    pMethod     hash method
     74 //
     75 //
     76 // Note.
     77 //    MGF1 defined in the IEEE P1363 standard.
     78 //    MGF1 defined in the ANSI X9.63 standard and frequently called KDF (key Generation Function).
     79 //    The fifference between MGF1 and MGF2 is negligible - counter i runs from 0 (in MGF1) and from 1 (in MGF2)
     80 *F*/
     81 IPPFUN(IppStatus, ippsMGF1_rmf,(const Ipp8u* pSeed, int seedLen, Ipp8u* pMask, int maskLen, const IppsHashMethod* pMethod))
     82 {
     83    IPP_BAD_PTR2_RET(pMask, pMethod);
     84    IPP_BADARG_RET((seedLen<0)||(maskLen<0), ippStsLengthErr);
     85 
     86    {
     87       /* hash specific */
     88       int hashSize = pMethod->hashLen;
     89 
     90       int i, outLen;
     91 
     92       __ALIGN8 IppsHashState_rmf hashCtx;
     93       ippsHashInit_rmf(&hashCtx, pMethod);
     94 
     95       if(!pSeed)
     96          seedLen = 0;
     97 
     98       for(i=0,outLen=0; outLen<maskLen; i++) { /* counter i runs from 0 */
     99          Ipp8u cnt[4];
    100          cnt[0] = (Ipp8u)((i>>24) & 0xFF);
    101          cnt[1] = (Ipp8u)((i>>16) & 0xFF);
    102          cnt[2] = (Ipp8u)((i>>8)  & 0xFF);
    103          cnt[3] = (Ipp8u)(i & 0xFF);
    104 
    105          ippsHashUpdate_rmf(pSeed, seedLen, &hashCtx);
    106          ippsHashUpdate_rmf(cnt,   4,       &hashCtx);
    107 
    108          if((outLen + hashSize) <= maskLen) {
    109             ippsHashFinal_rmf(pMask+outLen, &hashCtx);
    110             outLen += hashSize;
    111          }
    112          else {
    113             Ipp8u md[MAX_HASH_SIZE];
    114             ippsHashFinal_rmf(md, &hashCtx);
    115             CopyBlock(md, pMask+outLen, maskLen-outLen);
    116             outLen = maskLen;
    117          }
    118       }
    119 
    120       return ippStsNoErr;
    121    }
    122 }
    123