需要从 y、p、g 作为 BigIntegers 创建 DHPublicKey [英] Need to create DHPublicKey from y, p, g as BigIntegers

问题描述

我需要一个 DHPublicKey 来加密一些数据.因此，我已经获得了所有需要的参数作为 BigIntegers (y, p, g).不幸的是，我没有看到从这些适合 DHPublicKey 接口的参数创建公钥对象的直接方法.有什么想法吗?

I need a DHPublicKey to encrypt some data. Therefore I have been provided with all the needed parameters as BigIntegers (y, p, g). Unfortunately I don't see a straight way for creating a public key object from these parameters that would fit the DHPublicKey interface. Any idea?

推荐答案

    KeyFactory keyFactory;
    KeyPairGenerator kpg;
    DHPublicKey originalDhPubKey, fromSpecsDhPubKey;
    DHPublicKeySpec dhPubKeySpecs;
    KeyPair kp;
    BigInteger p, g, y;

    // generate a DH key pair
    kpg = KeyPairGenerator.getInstance("DH");
    kp = kpg.generateKeyPair();

    // get the DH public key
    originalDhPubKey = (DHPublicKey) kp.getPublic();
    // get P, G and Y specs
    p = originalDhPubKey.getParams().getP();
    g = originalDhPubKey.getParams().getG();
    y = originalDhPubKey.getY();

    // get a DH KeyFactory
    keyFactory = KeyFactory.getInstance("DH");

    // create a DHPublicKeySpec with the specs you have
    dhPubKeySpecs = new DHPublicKeySpec(y, p, g);

    // get the DHPublicKey
    fromSpecsDhPubKey = (DHPublicKey) keyFactory.generatePublic(dhPubKeySpecs);

    // Check that the DH public values are equal
    System.out.println(originalDhPubKey.getY().equals(fromSpecsDhPubKey.getY()));

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