// Copyright 2021 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build (!amd64 && !arm64 && !ppc64le && !s390x) || purego package nistec import ( "bytes" "crypto/internal/fips140/nistec/fiat" "fmt" "testing" ) func TestP256PrecomputedTable(t *testing.T) { base := NewP256Point().SetGenerator() for i := 0; i < 43; i++ { t.Run(fmt.Sprintf("table[%d]", i), func(t *testing.T) { testP256AffineTable(t, base, &p256GeneratorTables[i]) }) for k := 0; k < 6; k++ { base.Double(base) } } } func testP256AffineTable(t *testing.T, base *P256Point, table *p256AffineTable) { p := NewP256Point() zInv := new(fiat.P256Element) for j := 0; j < 32; j++ { p.Add(p, base) // Convert p to affine coordinates. zInv.Invert(&p.z) p.x.Mul(&p.x, zInv) p.y.Mul(&p.y, zInv) p.z.One() if !bytes.Equal(table[j].x.Bytes(), p.x.Bytes()) || !bytes.Equal(table[j].y.Bytes(), p.y.Bytes()) { t.Fatalf("incorrect table entry at index %d", j) } } }