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40
41 /*
42 // Purpose:
43 // Intel(R) Integrated Performance Primitives. Cryptography Primitives.
44 // Internal Unsigned arithmetic
45 //
46 // Contents:
47 // cpSub_BNU()
48 //
49 */
50
51 #include "owncp.h"
52 #include "pcpbnuarith.h"
53 #include "pcpbnumisc.h"
54
55
56 /*F*
57 // Name: cpSub_BNU
58 //
59 // Purpose: Subtraction of two BigNums.
60 //
61 // Returns:
62 // borrow of result of sub two BigNums.
63 //
64 // Parameters:
65 // pA source BigNum A
66 // pB source BigNum B
67 // pR resultant BigNum
68 // ns size of BigNums
69 *F*/
70 #if defined(_USE_C_cpSub_BNU_)
71 #pragma message ("C version of cpSub_BNU: ON")
72 #else
73 #pragma message ("C version of cpSub_BNU: OFF")
74 #endif
75
76 #if !((_IPP==_IPP_W7) || \
77 (_IPP==_IPP_T7) || \
78 (_IPP==_IPP_V8) || \
79 (_IPP==_IPP_P8) || \
80 (_IPP>=_IPP_G9) || \
81 (_IPP==_IPP_S8) || \
82 (_IPP32E==_IPP32E_M7) || \
83 (_IPP32E==_IPP32E_U8) || \
84 (_IPP32E==_IPP32E_Y8) || \
85 (_IPP32E>=_IPP32E_E9) || \
86 (_IPP32E==_IPP32E_N8)) || \
87 defined(_USE_C_cpSub_BNU_)
cpSub_BNU(BNU_CHUNK_T * pR,const BNU_CHUNK_T * pA,const BNU_CHUNK_T * pB,cpSize ns)88 BNU_CHUNK_T cpSub_BNU(BNU_CHUNK_T* pR, const BNU_CHUNK_T* pA, const BNU_CHUNK_T* pB, cpSize ns)
89 {
90 BNU_CHUNK_T borrow = 0;
91 cpSize i;
92 for(i=0; i<ns; i++) {
93 SUB_ABC(borrow, pR[i], pA[i], pB[i], borrow);
94 }
95 return borrow;
96 }
97 #endif
98