使用c＃中的bouncy castle API查找PGP密钥的到期日期

Question

我使用以下网址

在线创建了PGP私钥和公钥

https://pgpkeygen.com/

姓名：测试

电子邮件：test@domain.com

算法：RSA

密钥大小：1024

过期：2年

密码：测试

公钥

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: Keybase OpenPGP v1.0.0
Comment: https://keybase.io/crypto

xo0EWaVVewEEALOBxiFQ5Y9f8QHouZKrxZPe6RuaLWUNl0maY/iQn/cBZ5WjNxQn
yN0Nzki/+0l8eqfvAbB7jStmOQEthhlnSqSkq8HfSJxQMr3kGjVS5ijXmYFmR2/y
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3JaAq/P2sDtODzz1SY5lMksJF9PaPqyNEQjEAU7UBcA=
=8zi3
-----END PGP PUBLIC KEY BLOCK-----

私钥

-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: Keybase OpenPGP v1.0.0
Comment: https://keybase.io/crypto

xcFGBFmlVXsBBACzgcYhUOWPX/EB6LmSq8WT3ukbmi1lDZdJmmP4kJ/3AWeVozcU
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F9PaPqyNEQjEAU7UBcA=
=HuWA
-----END PGP PRIVATE KEY BLOCK-----

我试图在C＃中使用Bouncy Castle API找出密钥的到期日期。 以下是代码

 private PgpPublicKey ReadPublicKey(string publicKeyPath)
        {
            using (Stream keyIn = File.OpenRead(publicKeyPath))
            using (var inputStream = PgpUtilities.GetDecoderStream(keyIn))
            {
                var publicKeyRingBundle = new PgpPublicKeyRingBundle(inputStream);
                var foundKey = GetFirstPublicKey(publicKeyRingBundle);
                if (foundKey != null)
                    return foundKey;
            }
            throw new ArgumentException("No encryption key found in public key ring.");
        }



private PgpPublicKey GetFirstPublicKey(PgpPublicKeyRingBundle publicKeyRingBundle)
    {
        foreach (PgpPublicKeyRing kRing in publicKeyRingBundle.GetKeyRings())
        {
            var key = kRing.GetPublicKeys()
                .Cast<PgpPublicKey>()
                .Where(k => k.IsEncryptionKey)
                .FirstOrDefault();

            if (key != null)
                return key;
        }
        return null;
    }

该函数被称为

PgpPublicKey key = ReadPublicKey(pathToPublicKey)

并尝试找出有效日期

key.ValidDays

但它总是返回0.即没有过期。

我能够访问其他属性，如密钥大小，名称和电子邮件等

我在这里想念的是什么？或者还有什么需要做的吗？