GetOctString

Developer Reference for Intel® Integrated Performance Primitives Cryptography

Converts a positive Big Number into octet String.

Syntax

IppStatus ippsGetOctString_BN(Ipp8u* pStr, int strLen, const IppsBigNumState* pBN);

Include Files

ippcp.h

Parameters

pStr	Pointer to the input octet string.
strLen	Octet string length in bytes.
pBN	Pointer to the context of the input Big Number.

Description

This function converts a positive Big Number into the octet string.

Return Values

ippStsNoErr	Indicates no error. Any other value indicates an error or warning.
ippStsNullPtrErr	Indicates an error condition if any of the specified pointers is NULL.
ippStsContextMatchErr	Indicates an error condition if the context parameter does not match the operation.
ippStsLengthErr	Indicates an error condition if specified pStr is insufficient in length.
ippStsRangeErr	Indicates an error condition if Big Number is negative.

Example

The code example below types a big number.

void Type_BN(const char* pMsg, const IppsBigNumState* pBN){
   // size of Big Number
   int size;
   ippsGetSize_BN(pBN, &size);
 		
  // extract Big Number value and convert it to the string presentation
  Ipp8u* bnValue = new Ipp8u [size*4];
  ippsGetOctString_BN(bnValue, size*4, pBN);
 		
  // type header
  if(pMsg)
     cout<<pMsg;
 		
  // type value
  for(int n=0; n<size*4; n++)
     cout<<hex<<setfill('0')<<setw(2)<<(int)bnValue[n];
  cout<<endl;

  delete [] bnValue;
}