java - 将字符串转换为公钥时获取公钥为空

Question

public static PublicKey strToPublicKey(String s) {

    PublicKey pbKey = null;
    try {

        BufferedReader br = new BufferedReader(new StringReader(s));
        PEMReader pr = new PEMReader(br);
        Object obj = pr.readObject();

        if (obj instanceof PublicKey) {
            pbKey = (PublicKey) pr.readObject();
        } else if (obj instanceof KeyPair) {
            KeyPair kp = (KeyPair) pr.readObject();
            pbKey = kp.getPublic();
        }
        pr.close();

    } catch (Exception e) {
        Log.d("CIPHER", e.getMessage());
    }
    return pbKey;
}

这一行返回空值

pbKey = (PublicKey) pr.readObject();
    Cipher cipher = Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding", "BC");

当我尝试将服务器 key 转换为 rsa 公钥类型时它在这一行返回空值

pbKey = (PublicKey) pr.readObject();

Answer 1

您的代码没有意义。您已经阅读了 key 。 instanceof 测试证明了这一点。您不应该读取另一个对象:您应该转换您已经读取的对象。