Save the Signature and the Public Key in Files将签名和公钥保存在文件中

Now that you have generated a signature for some data, you need to save the signature bytes in one file and the public key bytes in another so you can send (via modem, floppy, mail, and so on) someone else现在您已经为某些数据生成了签名，您需要将签名字节保存在一个文件中，将公钥字节保存在另一个文件，以便您可以（通过调制解调器、软盘、邮件等）发送给其他人

• the data for which the signature was generated,生成签名的数据，
• the signature, and签名，以及
• the public key公钥

The receiver can verify that the data came from you and was not modified in transit by running the VerSig program you will generate in the upcoming Verifying a Digital Signature steps. That program uses the public key to verify that the signature received is the true signature for the data received.接收器可以通过运行您在即将到来的验证数字签名步骤中生成的VerSig程序来验证数据是否来自您，并且在传输过程中没有被修改。该程序使用公钥来验证接收到的签名是否是接收到的数据的真实签名。

Recall that the signature was placed in a byte array named realSig. You can save the signature bytes in a file named sig via the following.回想一下，签名被放置在一个名为realSig的字节数组中。您可以通过以下方式将签名字节保存在名为sig的文件中。

/* save the signature in a file */
FileOutputStream sigfos = new FileOutputStream("sig");
sigfos.write(realSig);
sigfos.close();

Recall from the Generate Public and Private Keys step that the public key was placed in a PublicKey object named pub. 回想一下，在生成公钥和私钥步骤中，公钥被放置在名为pub的公钥对象中。You can get the encoded key bytes by calling the getEncoded method and then store the encoded bytes in a file. You can name the file whatever you want. 您可以通过调用getEncoded方法来获取编码的密钥字节，然后将编码的字节存储在文件中。你可以随意命名文件。If, for example, your name is Susan, you might name it something like suepk (for "Sue's public key"), as in the following:例如，如果你的名字是Susan，你可以将其命名为suepk（意为“Sue's公钥”），如下所示：

/* save the public key in a file */
byte[] key = pub.getEncoded();
FileOutputStream keyfos = new FileOutputStream("suepk");
keyfos.write(key);
keyfos.close();