basic_verilog/Advanced Synthesis Cookbook/crypto/aes/shift_rows.cpp

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// baeckler - 03-07-2006
// a little utility to generate 
// the shift rows byte pattern

#include <stdio.h>

void index (int row, int col)
{
	int bit = 127 - (col * 4 * 8 + row * 8);
	fprintf (stdout,"%d:%d",bit,bit-7);
}

int main (void)
{
	int r,c;

	fprintf (stdout,"SHift rows : \n");
	for (c=0; c<4; c++)
	{
		for (r=0;r<4;r++)
		{
			fprintf (stdout,"in[");
			index (r,(c+r)%4);
			fprintf (stdout,"],");
		}
		fprintf (stdout,"\n");
	}

	fprintf (stdout,"\nInverse shift rows : \n");
	for (c=0; c<4; c++)
	{
		for (r=0;r<4;r++)
		{
			fprintf (stdout,"in[");
			index (r,(4+c-r)%4);
			fprintf (stdout,"],");
		}
		fprintf (stdout,"\n");
	}
	return (0);
}