什么是RSA“密钥ID”？

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我已经看到在几个地方使用的密钥ID，并希望在我的程序中使用它们，但我没有能够找到它们的描述。

I've seen key IDs used in several places and would like to use them in my program, but I haven't been able to find a description of them. How are they generated?

推荐答案

在不同的格式（PGP，SSH，X.509证书）中，密钥ID具有不同的含义。 SSH和X.509都没有专用密钥ID的概念，但有些人使用这个术语（包括他们的软件） - 在这种情况下，它通常是公共密钥或整个证书的哈希。

In different formats (PGP, SSH, X.509 certificates) key ID has different meaning. Neither SSH nor X.509 have a "dedicated" concept of key ID, but some people use this term (including their software) - in this case it's usually a hash of the public key or of the certificate in whole.

更新：注释提醒我，X.509证书中存在密钥标识符扩展名，有时它们被称为密钥ID。然而，这不常见 - 通常哈希（有时也称为指纹）被称为密钥ID。

Update: the comments reminded me that "key identifier" extensions exist in X.509 certifiactes, and they sometimes are being referred to as key IDs. Yet, this is not common - usually the hash (also sometimes called the fingerprint) is referenced as key ID.