/**
* Takes input BIGs a, b, m and returns a+b modulo m
*
* @param a the first BIG to add
* @param b the second BIG to add
* @param m the modulus
* @return Returns a+b (mod m)
*/
public static BIG ModAdd(this BIG a, BIG b, BIG m)
{
BIG c = a.Plus(b);
c.Mod(m);
return(c);
}
