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40
41 /*
42 // Purpose:
43 // Intel(R) Integrated Performance Primitives. Cryptography Primitives.
44 // Internal Unsigned BNU misc functionality
45 //
46 // Contents:
47 // cpToOctStr_BNU()
48 //
49 */
50
51 #include "owncp.h"
52 #include "pcpbnumisc.h"
53
54
55 /*
56 // Convert BNU into HexString representation
57 //
58 // Returns length of the string or 0 if no success
59 */
60
61 /*F*
62 // Name: cpToOctStr_BNU
63 //
64 // Purpose: Convert BNU into HexString representation.
65 //
66 // Returns:
67 // length of the string or 0 if no success
68 //
69 // Parameters:
70 // pA pointer to the source BN A
71 // nsA size of A
72 // pStr pointer to the target octet string
73 // strLen octet string length
74 *F*/
75
cpToOctStr_BNU(Ipp8u * pStr,cpSize strLen,const BNU_CHUNK_T * pA,cpSize nsA)76 cpSize cpToOctStr_BNU(Ipp8u* pStr, cpSize strLen, const BNU_CHUNK_T* pA, cpSize nsA)
77 {
78 FIX_BNU(pA, nsA);
79 {
80 cpSize bnuBitSize = BITSIZE_BNU(pA, nsA);
81 if(bnuBitSize <= strLen*BYTESIZE) {
82 int cnvLen = 0;
83 BNU_CHUNK_T x = pA[nsA-1];
84
85 ZEXPAND_BNU(pStr, 0, strLen);
86 pStr += strLen - BITS2WORD8_SIZE(bnuBitSize);
87
88 if(x) {
89 //int nb;
90 cpSize nb;
91 for(nb=cpNLZ_BNU(x)/BYTESIZE; nb<(cpSize)(sizeof(BNU_CHUNK_T)); cnvLen++, nb++)
92 *pStr++ = EBYTE(x, sizeof(BNU_CHUNK_T)-1-nb);
93
94 for(--nsA; nsA>0; cnvLen+=sizeof(BNU_CHUNK_T), nsA--) {
95 x = pA[nsA-1];
96 #if (BNU_CHUNK_BITS==BNU_CHUNK_64BIT)
97 *pStr++ = EBYTE(x,7);
98 *pStr++ = EBYTE(x,6);
99 *pStr++ = EBYTE(x,5);
100 *pStr++ = EBYTE(x,4);
101 #endif
102 *pStr++ = EBYTE(x,3);
103 *pStr++ = EBYTE(x,2);
104 *pStr++ = EBYTE(x,1);
105 *pStr++ = EBYTE(x,0);
106 }
107 }
108 return strLen;
109 }
110 else
111 return 0;
112 }
113 }
114