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package msp
import (
"bytes"
"crypto/rand"
"testing"
)
func TestFieldElemMultiplicationOne(t *testing.T) {
x := FieldElem(make([]byte, ModulusSize))
rand.Read(x)
xy, yx := x.Mul(One), One.Mul(x)
if !One.IsOne() {
t.Fatalf("One is not one?")
}
if bytes.Compare(xy, x) != 0 || bytes.Compare(yx, x) != 0 {
t.Fatalf("Multiplication by 1 failed!\nx = %x\n1*x = %x\nx*1 = %x", x, yx, xy)
}
}
func TestFieldElemMultiplicationZero(t *testing.T) {
x := FieldElem(make([]byte, ModulusSize))
rand.Read(x)
xy, yx := x.Mul(Zero), Zero.Mul(x)
if !Zero.IsZero() {
t.Fatalf("Zero is not zero?")
}
if !xy.IsZero() || !yx.IsZero() {
t.Fatalf("Multiplication by 0 failed!\nx = %x\n0*x = %x\nx*0 = %x", x, yx, xy)
}
}
func TestFieldElemInvert(t *testing.T) {
x := FieldElem(make([]byte, ModulusSize))
rand.Read(x)
xInv := x.Invert()
xy, yx := x.Mul(xInv), xInv.Mul(x)
if !xy.IsOne() || !yx.IsOne() {
t.Fatalf("Multiplication by inverse failed!\nx = %x\nxInv = %x\nxInv*x = %x\nx*xInv = %x", x, xInv, yx, xy)
}
}
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