#include <stdio.h>
#include <stdlib.h>
#include <cmath>
#include <string>

using namespace std;

char* RotN( char* szText, int N );
std::string base64( const char *lpszData, unsigned long nDataLen );

int main( int argc, char* argv[] )
{
	char* buffer = {0};

	printf("argv[1] -> %s\n", argv[1]);	
	
	printf("RotN(base64(argv[1], strlen(argv[1])), N) -> %s%s",argv[2],RotN((char*)base64((const char*)argv[1], strlen(argv[1])).c_str(), atoi(argv[2])));
	
	return 0;
}

char* RotN( char* szText, int N )
{
	char szBuf[512];
	char cap, byte;

	for(int i = 0; i < (int)strlen(szText); i++)
    {
		byte = szText[i];
		cap = byte & 32;
		byte &= ~cap;
		byte = ((byte >= 'A') && (byte <= 'Z') ? ((byte - 'A' + N) % 26 + 'A') : byte) | cap;
		szBuf[i] = byte;
    }
	szBuf[i] = 0x00;
	return szBuf;
}

std::string base64( const char *lpszData, unsigned long nDataLen )
{
	static char Base64CharTable[] =
	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	"abcdefghijklmnopqrstuvwxyz"
	"0123456789+/";

	// reserve memory
	std::string sBase64;
	sBase64.reserve( ( nDataLen ) );
	
	// encode
	unsigned long nLinePos = 0;
	while( nDataLen > 0 )
	{
		unsigned long n;

		// get 24 bits
		// - get bytes available
		unsigned long nBytesCount;
		if( nDataLen >= 3 )
			nBytesCount = 3;
		else if( nDataLen == 2 )
			nBytesCount	= 2;
		else if( nDataLen == 1 )
			nBytesCount	= 1;
		unsigned long nBase64Blocks = ceil( ( nBytesCount * 8.0 / 6.0 ) );
		// - read
		char Bytes[ 3 ];
		for( n = 0; n < nBytesCount; n++ )
			Bytes[ n ] = lpszData[ n ];
		lpszData += nBytesCount;
		nDataLen -= nBytesCount;

		// encode
		char Base64TableIndex[ 4 ];
		Base64TableIndex[ 0 ] = ( Bytes[0] & 0xfc ) >> 2;
		Base64TableIndex[ 1 ] = ( ( Bytes[ 0 ] & 0x03 ) << 4 ) + ( ( Bytes[ 1 ] & 0xf0 ) >> 4 );
		Base64TableIndex[ 2 ] = ( ( Bytes[ 1 ] & 0x0f ) << 2 ) + ( ( Bytes[ 2 ] & 0xc0 ) >> 6 );
		Base64TableIndex[ 3 ] = Bytes[ 2 ] & 0x3f;
		for( n = 0; n < nBase64Blocks; n++ )
		{
			sBase64.append( 1, Base64CharTable[ Base64TableIndex[ n ] ] );
			nLinePos++;
		}

		// lines
/*		if( nLinePos >= 72 )
		{
			sBase64.append( lpszEndOfLine );
			nLinePos = 0;
		}
*/

		// add padding
		for( n = nBase64Blocks; n < 4; n++ )
			sBase64.append( 1, '=' );
	}

	return sBase64;
}