KeyPairGeneration在RSA的Java中不起作用

Question

我正在尝试使用java.security为Java中的RSA加密获取私钥和​​公钥。无论我在Google的哪个地方，我都会收到同样的错误消息，说NoSuchAlgorithException。

class secret {
    void secret(){
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(2048);
        KeyPair kp = kpg.generateKeyPair();
        PublicKey pubkey = kp.getPublic();
        PrivateKey privkey = kp.getPrivate();
        System.out.println(privkey.getEncoded()+"---"+pubkey.getEncoded());
    }
}

这是我的秘密课程，实现RSA的密钥派生。这是我的主要

class project {
    public static void main(String[] args) {
        System.out.println("Hello!");
        secret sec = new secret();
    }
}

这是错误

javac project.java
Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=on -Dswing.aatext=true
project.java:11: error: unreported exception NoSuchAlgorithmException; must be caught or declared to be thrown
                KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
                                                                   ^
1 error

Answer 1

方法KeyPairGenerator＃getInstance定义为

public static KeyPairGenerator getInstance(String algorithm) throws NoSuchAlgorithmException

NoSuchAlgorithmException是checked exception。您必须处理它：

static void secret(){
    KeyPairGenerator kpg = null;
    try {
        kpg = KeyPairGenerator.getInstance("RSA");
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException(e);
    }
    kpg.initialize(2048);
    KeyPair kp = kpg.generateKeyPair();
    PublicKey pubkey = kp.getPublic();
    PrivateKey privkey = kp.getPrivate();
    System.out.println(privkey.getEncoded()+"---"+pubkey.getEncoded());
}