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| |
| /* |
| // Intel(R) Integrated Performance Primitives |
| // Cryptographic Primitives (ippcp) |
| // |
| // Contents: |
| // ippsSub_BN() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpbn.h" |
| #include "pcptool.h" |
| |
| |
| /*F* |
| // Name: ippsSub_BN |
| // |
| // Purpose: Subtract BigNums. |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr pA == NULL |
| // pB == NULL |
| // pR == NULL |
| // ippStsContextMatchErr !BN_VALID_ID(pA) |
| // !BN_VALID_ID(pB) |
| // !BN_VALID_ID(pR) |
| // ippStsOutOfRangeErr pR can not hold result |
| // ippStsNoErr no errors |
| // |
| // Parameters: |
| // pA source BigNum |
| // pB source BigNum |
| // pR resultant BigNum |
| // |
| *F*/ |
| IPPFUN(IppStatus, ippsSub_BN, (IppsBigNumState* pA, IppsBigNumState* pB, IppsBigNumState* pR)) |
| { |
| IPP_BAD_PTR3_RET(pA, pB, pR); |
| |
| pA = (IppsBigNumState*)( IPP_ALIGNED_PTR(pA, BN_ALIGNMENT) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pA), ippStsContextMatchErr); |
| pB = (IppsBigNumState*)( IPP_ALIGNED_PTR(pB, BN_ALIGNMENT) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pB), ippStsContextMatchErr); |
| pR = (IppsBigNumState*)( IPP_ALIGNED_PTR(pR, BN_ALIGNMENT) ); |
| IPP_BADARG_RET(!BN_VALID_ID(pR), ippStsContextMatchErr); |
| |
| { |
| cpSize nsA = BN_SIZE(pA); |
| cpSize nsB = BN_SIZE(pB); |
| cpSize nsR = BN_ROOM(pR); |
| IPP_BADARG_RET(nsR < IPP_MAX(nsA, nsB), ippStsOutOfRangeErr); |
| |
| { |
| BNU_CHUNK_T* pDataR = BN_NUMBER(pR); |
| |
| IppsBigNumSGN sgnA = BN_SIGN(pA); |
| IppsBigNumSGN sgnB = BN_SIGN(pB); |
| BNU_CHUNK_T* pDataA = BN_NUMBER(pA); |
| BNU_CHUNK_T* pDataB = BN_NUMBER(pB); |
| |
| BNU_CHUNK_T carry; |
| |
| if(sgnA!=sgnB) { |
| if(nsA < nsB) { |
| SWAP(nsA, nsB); |
| SWAP_PTR(BNU_CHUNK_T, pDataA, pDataB); |
| } |
| |
| carry = cpAdd_BNU(pDataR, pDataA, pDataB, nsB); |
| if(nsA>nsB) |
| carry = cpInc_BNU(pDataR+nsB, pDataA+nsB, nsA-nsB, carry); |
| if(carry) { |
| if(nsR > nsA) |
| pDataR[nsA++] = carry; |
| else |
| IPP_ERROR_RET(ippStsOutOfRangeErr); |
| } |
| BN_SIGN(pR) = sgnA; |
| } |
| |
| else { |
| int cmpRes= cpCmp_BNU(pDataA, nsA, pDataB, nsB); |
| |
| if(0==cmpRes) { |
| ZEXPAND_BNU(pDataR,0, nsR); |
| BN_SIZE(pR) = 1; |
| BN_SIGN(pR) = ippBigNumPOS; |
| return ippStsNoErr; |
| } |
| |
| if(0>cmpRes) { |
| SWAP(nsA, nsB); |
| SWAP_PTR(BNU_CHUNK_T, pDataA, pDataB); |
| } |
| |
| carry = cpSub_BNU(pDataR, pDataA, pDataB, nsB); |
| if(nsA>nsB) |
| cpDec_BNU(pDataR+nsB, pDataA+nsB, nsA-nsB, carry); |
| |
| BN_SIGN(pR) = cmpRes>0? sgnA : INVERSE_SIGN(sgnA); |
| } |
| |
| FIX_BNU(pDataR, nsA); |
| BN_SIZE(pR) = nsA; |
| |
| return ippStsNoErr; |
| } |
| } |
| } |