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我正在尝试在 swift 和 java server 之间开发 key-exchange diffe-Hellman 。我阅读了有关 Diffie hetlman 的所有链接，并且在所有链接中都告诉我应该使用它(g^a mod p)^b mod p = g^ab mod p来制作 PublicKey。

但是当我开始与服务器共享我的公钥时，我遇到了这个异常

java.security.spec.InvalidKeySpecException: Inappropriate key specification
  at com.sun.crypto.provider.DHKeyFactory.engineGeneratePublic(DHKeyFactory.java:85)
  at java.security.KeyFactory.generatePublic(KeyFactory.java:334)
  at com.pushro.server.managers.server.RequestsHandler.processKeyExchange(RequestsHandler.java:867)
  at com.pushro.server.managers.server.RequestsHandler.processPacket(RequestsHandler.java:275)
  at com.pushro.server.managers.server.RequestsHandler.processPacket(RequestsHandler.java:1315)
  at com.pushro.server.managers.server.RequestsHandler.access$000(RequestsHandler.java:40)
  at com.pushro.server.managers.server.RequestsHandler$1.handleEvent(RequestsHandler.java:96)
  at com.pushro.server.managers.queue.DisruptorManager$WriteEventHandler.onEvent(DisruptorManager.java:37)
  at com.pushro.server.managers.queue.DisruptorManager$WriteEventHandler.onEvent(DisruptorManager.java:34)
  at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:129)
  at java.lang.Thread.run(Thread.java:748)
Caused by: java.security.InvalidKeyException: Invalid key format
  at com.sun.crypto.provider.DHPublicKey.<init>(DHPublicKey.java:127)
  at com.sun.crypto.provider.DHKeyFactory.engineGeneratePublic(DHKeyFactory.java:78)
  ... 10 more

我使用标准 X509EncodedKeySpec 获取密钥并在 java 中生成密码。

X509EncodedKeySpec ks = new X509EncodedKeySpec(PublicKey_byte);
KeyFactory keyFactory = KeyFactory.getInstance("DH");
PublicKey clientPublicKey = keyFactory.generatePublic(ks);

我已阅读所有此链接，但他们没有帮助我。

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