清单2中的回调旨在支持使用同一个公开-私有密匙对进行签名和解密，因此将在两种情况下进行检查并对任意一种情况返回相同的密码。

The callback in Listing 2 is designed to support both signing and decrypting using the same private-public key pair, so it checks for both cases and returns the same password in either case.

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在运行时，Rampart需要获得用于保护私有密匙的密码，这个私有密匙用于对已加密数据进行解密。

At run time, Rampart needs to get the password used to protect the private key to be used to decrypt the encrypted data.

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