mul_2_4.m

修正的euclid算法matlab程序

%y=(a3*b3+a2*b1+a3*b0+a0*b3+a1*b2)*x^3+(a3*b2+a2*b3+a0*b2+a3*b3+a2*b0+a1*b1)*x^2+(a1*b3+a1*b0+a3*b2+a3*b1+a2*b2+a2*b3+a0*b1)*x+a0*b0+a2*b2+a1*b3+a3*b1; 
%%%计算G(2^4)中两个元素相乘
function product=mul_2_4(a,b)%LSB-MSB
product(1)=mod(a(1)*b(1)+a(3)*b(3)+a(2)*b(4)+a(4)*b(2),2);
product(2)=mod(a(2)*b(4)+a(2)*b(1)+a(4)*b(3)+a(4)*b(2)+a(3)*b(3)+a(3)*b(4)+a(1)*b(2),2);
product(3)=mod(a(4)*b(3)+a(3)*b(4)+a(1)*b(3)+a(4)*b(4)+a(3)*b(1)+a(2)*b(2),2);
product(4)=mod(a(4)*b(4)+a(3)*b(2)+a(4)*b(1)+a(1)*b(4)+a(2)*b(3),2);