add mimc7 & fields

field/field_test.go

@@ -0,0 +1,39 @@
+// code originally taken from https://github.com/arnaucube/go-snark (https://github.com/arnaucube/go-snark/blob/master/fields/fq.go), pasted here to ensure compatibility among future changes
+
+package field
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func iToBig(a int) *big.Int {
+	return big.NewInt(int64(a))
+}
+
+func TestFq1(t *testing.T) {
+	fq1 := NewFq(iToBig(7))
+
+	res := fq1.Add(iToBig(4), iToBig(4))
+	assert.Equal(t, iToBig(1), fq1.Affine(res))
+
+	res = fq1.Double(iToBig(5))
+	assert.Equal(t, iToBig(3), fq1.Affine(res))
+
+	res = fq1.Sub(iToBig(5), iToBig(7))
+	assert.Equal(t, iToBig(5), fq1.Affine(res))
+
+	res = fq1.Neg(iToBig(5))
+	assert.Equal(t, iToBig(2), fq1.Affine(res))
+
+	res = fq1.Mul(iToBig(5), iToBig(11))
+	assert.Equal(t, iToBig(6), fq1.Affine(res))
+
+	res = fq1.Inverse(iToBig(4))
+	assert.Equal(t, iToBig(2), res)
+
+	res = fq1.Square(iToBig(5))
+	assert.Equal(t, iToBig(4), res)
+}