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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 // cpFromOctStr_BNU()
48 //
49 */
50
51 #include "owncp.h"
52 #include "pcpbnumisc.h"
53
54 /*F*
55 // Name: cpFromOctStr_BNU
56 //
57 // Purpose: Convert Oct String into BNU representation.
58 //
59 // Returns:
60 // size of BNU in BNU_CHUNK_T chunks
61 //
62 // Parameters:
63 // pStr pointer to the source octet string
64 // strLen octet string length
65 // pA pointer to the target BN
66 //
67 *F*/
68
cpFromOctStr_BNU(BNU_CHUNK_T * pA,const Ipp8u * pStr,cpSize strLen)69 cpSize cpFromOctStr_BNU(BNU_CHUNK_T* pA, const Ipp8u* pStr, cpSize strLen)
70 {
71 int nsA =0;
72
73 /* start from the end of string */
74 for(; strLen>=(int)sizeof(BNU_CHUNK_T); nsA++,strLen-=(int)(sizeof(BNU_CHUNK_T))) {
75 /* pack sizeof(BNU_CHUNK_T) bytes into single BNU_CHUNK_T value*/
76 *pA++ =
77 #if (BNU_CHUNK_BITS==BNU_CHUNK_64BIT)
78 +( (BNU_CHUNK_T)pStr[strLen-8]<<(8*7) )
79 +( (BNU_CHUNK_T)pStr[strLen-7]<<(8*6) )
80 +( (BNU_CHUNK_T)pStr[strLen-6]<<(8*5) )
81 +( (BNU_CHUNK_T)pStr[strLen-5]<<(8*4) )
82 #endif
83 +( (BNU_CHUNK_T)pStr[strLen-4]<<(8*3) )
84 +( (BNU_CHUNK_T)pStr[strLen-3]<<(8*2) )
85 +( (BNU_CHUNK_T)pStr[strLen-2]<<(8*1) )
86 + (BNU_CHUNK_T)pStr[strLen-1];
87 }
88
89 /* convert the beginning of the string */
90 if(strLen) {
91 BNU_CHUNK_T x = 0;
92 for(x=0; strLen>0; strLen--) {
93 BNU_CHUNK_T d = *pStr++;
94 x = (x<<8) + d;
95 }
96 *pA++ = x;
97 nsA++;
98 }
99
100 return nsA;
101 }
102