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| |
| /* |
| // Purpose: |
| // Cryptography Primitive. |
| // HASH based Mask Generation Functions |
| // |
| // Contents: |
| // ippsMGF1_rmf() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcphash_rmf.h" |
| #include "pcptool.h" |
| |
| /*F* |
| // Name: ippsMGF1 |
| // |
| // Purpose: Mask Generation Functios. |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr pMask == NULL |
| // pMethod ==NULL |
| // ippStsLengthErr seedLen <0 |
| // maskLen <0 |
| // ippStsNoErr no errors |
| // |
| // Parameters: |
| // pSeed pointer to the input stream |
| // seedLen input stream length (bytes) |
| // pMaske pointer to the ouput mask |
| // maskLen desired length of mask (bytes) |
| // pMethod hash method |
| // |
| // |
| // Note. |
| // MGF1 defined in the IEEE P1363 standard. |
| // MGF1 defined in the ANSI X9.63 standard and frequently called KDF (key Generation Function). |
| // The fifference between MGF1 and MGF2 is negligible - counter i runs from 0 (in MGF1) and from 1 (in MGF2) |
| *F*/ |
| IPPFUN(IppStatus, ippsMGF1_rmf,(const Ipp8u* pSeed, int seedLen, Ipp8u* pMask, int maskLen, const IppsHashMethod* pMethod)) |
| { |
| IPP_BAD_PTR2_RET(pMask, pMethod); |
| IPP_BADARG_RET((seedLen<0)||(maskLen<0), ippStsLengthErr); |
| |
| { |
| /* hash specific */ |
| int hashSize = pMethod->hashLen; |
| |
| int i, outLen; |
| |
| __ALIGN8 IppsHashState_rmf hashCtx; |
| ippsHashInit_rmf(&hashCtx, pMethod); |
| |
| if(!pSeed) |
| seedLen = 0; |
| |
| for(i=0,outLen=0; outLen<maskLen; i++) { /* counter i runs from 0 */ |
| Ipp8u cnt[4]; |
| cnt[0] = (Ipp8u)((i>>24) & 0xFF); |
| cnt[1] = (Ipp8u)((i>>16) & 0xFF); |
| cnt[2] = (Ipp8u)((i>>8) & 0xFF); |
| cnt[3] = (Ipp8u)(i & 0xFF); |
| |
| ippsHashUpdate_rmf(pSeed, seedLen, &hashCtx); |
| ippsHashUpdate_rmf(cnt, 4, &hashCtx); |
| |
| if((outLen + hashSize) <= maskLen) { |
| ippsHashFinal_rmf(pMask+outLen, &hashCtx); |
| outLen += hashSize; |
| } |
| else { |
| Ipp8u md[MAX_HASH_SIZE]; |
| ippsHashFinal_rmf(md, &hashCtx); |
| CopyBlock(md, pMask+outLen, maskLen-outLen); |
| outLen = maskLen; |
| } |
| } |
| |
| return ippStsNoErr; |
| } |
| } |