Question

那里。我在java应用程序和php服务器之间实现Diffie Hellman密钥交换协议。当我从php服务器获取密钥时，我有一些问题，密钥是String格式，我想将它转换为PublicKey执行协议。代码是下一个：

public static PublicKey getPublicKey(String publicKey) throws Exception {
    byte[] byteKey =publicKey.getBytes();
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(byteKey);
    KeyFactory keyFact = KeyFactory.getInstance("DH");
    PublicKey pubKey = keyFact.generatePublic(x509KeySpec);
    DHPublicKey dhPublicKey;
    return pubKey;
}

当我运行此功能时，我有这个例外：

Exception in thread "main" java.security.spec.InvalidKeySpecException: Inappropriate key specification
at com.sun.crypto.provider.DHKeyFactory.engineGeneratePublic(DHKeyFactory.java:87)
at java.security.KeyFactory.generatePublic(Unknown Source)
at main2.getPublicKey(main2.java:47)
at main2.main(main2.java:108)

键是一个大整数类型，如：＆＃34; 2730833911517276610828829348409530515930034154987099616280024338836450623403836102419905982575105923164305996145622906355021487887788144551871008554848191＆＃34; 我该如何纠正这个问题？谢谢你的时间

Answer 1

我已经解决了这个问题，感谢用户3062946。这是代码：

public static PublicKey getPublicKey(BigInteger publicKey, BigInteger p, BigInteger g) throws Exception {
    DHPublicKeySpec dhspec=new DHPublicKeySpec(publicKey,p,g);
    KeyFactory keyFact = KeyFactory.getInstance("DH");
    PublicKey pubKey = keyFact.generatePublic(dhspec);

    return pubKey;
}

字符串到publicKey

1 个答案: