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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // RSA Functions
46 //
47 //
48 */
49
50 #include "owndefs.h"
51 #include "owncp.h"
52 #include "pcpbn.h"
53 #include "pcpprimeg.h"
54 #include "pcpprng.h"
55 #include "pcpngrsa.h"
56
57 /* test if E and A are coprime */
cpIsCoPrime(BNU_CHUNK_T * pA,int nsA,BNU_CHUNK_T * pB,int nsB,BNU_CHUNK_T * pBuffer)58 static int cpIsCoPrime(BNU_CHUNK_T* pA, int nsA,
59 BNU_CHUNK_T* pB, int nsB,
60 BNU_CHUNK_T* pBuffer)
61 {
62 if (nsA>nsB) {
63 SWAP_PTR(BNU_CHUNK_T, pA, pB);
64 SWAP(nsA, nsB);
65 }
66 {
67 IppsBigNumState bnA, bnB, bnGcd;
68 BNU_CHUNK_T* pDataA = pBuffer;
69 BNU_CHUNK_T* pBuffA = pDataA + nsA + 1;
70 BNU_CHUNK_T* pDataB = pBuffA + nsA + 1;
71 BNU_CHUNK_T* pBuffB = pDataB + nsB + 1;
72 BNU_CHUNK_T* pDataGcd = pBuffB + nsB + 1;
73 BNU_CHUNK_T* pBuffGcd = pDataGcd + nsB + 1;
74
75 BN_Make(pDataA, pBuffA, nsA, &bnA);
76 BN_Make(pDataB, pBuffB, nsB, &bnB);
77 BN_Make(pDataGcd, pBuffGcd, nsB, &bnGcd);
78
79 COPY_BNU(pDataA, pA, nsA)
80 BN_Set(pDataA, nsA, &bnA);
81 COPY_BNU(pDataB, pB, nsB)
82 BN_Set(pDataB, nsB, &bnB);
83 ippsGcd_BN(&bnA, &bnB, &bnGcd);
84 return 0 == cpBN_cmp(&bnGcd, cpBN_OneRef());
85 }
86 }