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27 lines
772 B
Go
27 lines
772 B
Go
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//
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// Copyright Coinbase, Inc. All Rights Reserved.
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package v1
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import (
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"math/big"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestEd25519ScalarMult(t *testing.T) {
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// These values were caught during testing where this combination
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// yields leading zeros in which big.Int chops.
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// This test makes sure that this case is correctly handled
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y := new(big.Int).SetBytes([]byte{37, 228, 49, 105, 78, 97, 108, 221, 63, 25, 125, 212, 108, 189, 247, 169, 52, 86, 150, 97, 93, 199, 212, 254, 122, 98, 189, 7, 97, 14, 78, 12})
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x := new(big.Int).SetInt64(4)
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curve := Ed25519()
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require.True(t, curve.IsOnCurve(nil, y))
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_, newY := curve.ScalarMult(nil, y, x.Bytes())
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require.True(t, curve.IsOnCurve(nil, newY))
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}
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