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| |
| /* |
| // Purpose: |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // Internal BNU32 arithmetic. |
| // |
| // Contents: |
| // cpDec_BNU32() |
| // |
| */ |
| |
| #include "owncp.h" |
| #include "pcpbnumisc.h" |
| #include "pcpbnu32misc.h" |
| #include "pcpbnu32arith.h" |
| |
| /*F* |
| // Name: cpDec_BNU32 |
| // |
| // Purpose: BNU32 decrement. |
| // |
| // Returns: |
| // borrow |
| // |
| // Parameters: |
| // pA source |
| // pR result |
| // ns size |
| // v borrow |
| // |
| *F*/ |
| |
| Ipp32u cpDec_BNU32(Ipp32u* pR, const Ipp32u* pA, cpSize ns, Ipp32u v) |
| { |
| Ipp32u borrow = v; |
| int n; |
| for(n=0; n<ns; n++) { |
| Ipp64u t = (Ipp64u)(pA[n]) - (Ipp64u)borrow; |
| pR[n] = LODWORD(t); |
| borrow = HIDWORD(t)>>(32-1); |
| } |
| return borrow; |
| } |
