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| |
| /* |
| // Purpose: |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // Internal Unsigned arithmetic |
| // |
| // Contents: |
| // cpDec_BNU() |
| // |
| */ |
| |
| #include "owncp.h" |
| #include "pcpbnuarith.h" |
| #include "pcpbnumisc.h" |
| |
| /*F* |
| // Name: cpDec_BNU |
| // |
| // Purpose: decrement BigNum. |
| // |
| // Returns: |
| // borrow of result of dec BigNum. |
| // |
| // Parameters: |
| // pA source BigNum A |
| // pR resultant BigNum |
| // ns size of BigNum |
| // val carry |
| *F*/ |
| |
| #if !((_IPP32E==_IPP32E_M7) || \ |
| (_IPP32E==_IPP32E_U8) || \ |
| (_IPP32E==_IPP32E_Y8) || \ |
| (_IPP32E>=_IPP32E_E9) || \ |
| (_IPP32E==_IPP32E_N8)) |
| BNU_CHUNK_T cpDec_BNU(BNU_CHUNK_T* pR, const BNU_CHUNK_T* pA, cpSize ns, BNU_CHUNK_T val) |
| { |
| cpSize i; |
| for(i=0; i<ns && val; i++) { |
| BNU_CHUNK_T borrow; |
| SUB_AB(borrow, pR[i], pA[i], val); |
| val = borrow; |
| } |
| if(pR!=pA) |
| for(; i<ns; i++) |
| pR[i] = pA[i]; |
| return val; |
| } |
| #endif |
