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Newly signed P256 based certificates will have their signature clamped to the low-s form. Update CHANGELOG.md
29 lines
565 B
Go
29 lines
565 B
Go
package p256
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestFlipping(t *testing.T) {
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priv, err1 := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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require.NoError(t, err1)
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out, err := ecdsa.SignASN1(rand.Reader, priv, []byte("big chungus"))
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require.NoError(t, err)
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r, s, err := parseSignature(out)
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require.NoError(t, err)
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r, s1, err := swap(r, s)
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require.NoError(t, err)
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r, s2, err := swap(r, s1)
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require.NoError(t, err)
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require.Equal(t, s, s2)
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require.NotEqual(t, s, s1)
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}
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