public static void CreateFromSubjectPublicKeyInfo_Roundtrip_ECDSA()
{
using ECDsa ecdsa = ECDsa.Create();
ecdsa.ImportFromPem(TestData.ECDsaPkcs8PublicKey);
byte[] spki = ecdsa.ExportSubjectPublicKeyInfo();
PublicKey key = PublicKey.CreateFromSubjectPublicKeyInfo(spki, out int read);
Assert.Throws <NotSupportedException>(() => key.Key);
Assert.Equal("1.2.840.10045.2.1", key.Oid.Value);
Assert.Equal(spki, key.ExportSubjectPublicKeyInfo());
Assert.Equal(spki.Length, read);
}
public static void ExportSubjectPublicKeyInfo_ECDSA()
{
using ECDsa ecdsa = ECDsa.Create();
ecdsa.ImportFromPem(TestData.ECDsaPkcs8PublicKey);
PublicKey key = new PublicKey(ecdsa);
Span <byte> algSpki = ecdsa.ExportSubjectPublicKeyInfo();
Assert.True(algSpki.SequenceEqual(key.ExportSubjectPublicKeyInfo()), "SequenceEquals(ExportSubjectPublicKeyInfo)");
// Just right
Assert.True(key.TryExportSubjectPublicKeyInfo(algSpki, out int written), nameof(key.TryExportSubjectPublicKeyInfo));
Assert.Equal(algSpki.Length, written);
// Too small
Assert.False(key.TryExportSubjectPublicKeyInfo(algSpki.Slice(1), out written), nameof(key.TryExportSubjectPublicKeyInfo));
Assert.Equal(0, written);
}