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1 /*******************************************************************************
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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