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40
41 /*
42 // Purpose:
43 // Intel(R) Integrated Performance Primitives. Cryptography Primitives.
44 // Unsigned internal BNU32 misc functionality
45 //
46 // Contents:
47 // cpToOctStr_BNU32()
48 //
49 */
50
51 #include "owncp.h"
52 #include "pcpbnuimpl.h"
53 #include "pcpbnumisc.h"
54 #include "pcpbnu32misc.h"
55
56 /*F*
57 // Name: cpFromOctStr_BNU32
58 //
59 // Purpose: Convert Oct String into BNU representation.
60 //
61 // Returns:
62 // size of BNU in BNU_CHUNK_T chunks
63 //
64 // Parameters:
65 // pOctStr pointer to the source octet string
66 // strLen octet string length
67 // pBNU pointer to the target BN
68 //
69 *F*/
70
cpFromOctStr_BNU32(Ipp32u * pBNU,const Ipp8u * pOctStr,cpSize strLen)71 cpSize cpFromOctStr_BNU32(Ipp32u* pBNU, const Ipp8u* pOctStr, cpSize strLen)
72 {
73 cpSize bnuSize=0;
74 *pBNU = 0;
75
76 /* start from the end of string */
77 for(; strLen>=4; bnuSize++,strLen-=4) {
78 /* pack 4 bytes into single Ipp32u value*/
79 *pBNU++ = ( pOctStr[strLen-4]<<(8*3) )
80 +( pOctStr[strLen-3]<<(8*2) )
81 +( pOctStr[strLen-2]<<(8*1) )
82 + pOctStr[strLen-1];
83 }
84
85 /* convert the beginning of the string */
86 if(strLen) {
87 Ipp32u x;
88 for(x=0; strLen>0; strLen--) {
89 Ipp32u d = *pOctStr++;
90 x = x*256 + d;
91 }
92 *pBNU++ = x;
93 bnuSize++;
94 }
95
96 return bnuSize? bnuSize : 1;
97 }
98