如何在Java中发送和接收DSA公共/私人签名消息

我找不到任何关于如何在Java中交换公钥/私钥签名消息的好（完整）文档

我还没有找到关于使用DSA生成公钥和私钥、对字节[]签名并进行验证所需的最低步骤的简明文档

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来自Oracle的太分散，需要跨多个JVM运行。

我已成功使用私钥对字节数组进行签名，并使用公钥对其进行验证

例如

    byte[] data = "hello.".getBytes();

    /* Test generating and verifying a DSA signature */
    try {
        /* generate a key pair */
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
        keyGen.initialize(1024, new SecureRandom());
        KeyPair pair = keyGen.generateKeyPair();

        /* create a Signature object to use
         * for signing and verifying */
        Signature dsa = Signature.getInstance("SHA/DSA"); 

        /* initialize the Signature object for signing */
        PrivateKey priv = pair.getPrivate();
        dsa.initSign(priv);

        /* Update and sign the data */
        dsa.update(data);

        /* Now that all the data to be signed
         * has been read in, sign it */
        byte[] sig = dsa.sign();

        /* Verify the signature */

        /* Initialize the Signature object for verification */
        PublicKey pub = pair.getPublic();
        dsa.initVerify(pub);

        /* Update and verify the data */
        dsa.update(data);

        boolean verifies = dsa.verify(sig);
        Assert.assertTrue(verifies);
    } catch (Exception e) {
        System.err.println("Caught exception " + e.toString());
    }

在这个版本中，我将公钥序列化为一个字节数组，然后从该字节数组创建一个公钥

    byte[] data = "hello.".getBytes();

    /* Test generating and verifying a DSA signature */
    try {
        /* generate a key pair */
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
        keyGen.initialize(1024, new SecureRandom());
        KeyPair pair = keyGen.generateKeyPair();

        /* create a Signature object to use
         * for signing and verifying */
        Signature dsa = Signature.getInstance("SHA/DSA"); 

        /* initialize the Signature object for signing */
        PrivateKey priv = pair.getPrivate();
        dsa.initSign(priv);

        /* Update and sign the data */
        dsa.update(data);

        /* Now that all the data to be signed
         * has been read in, sign it */
        byte[] sig = dsa.sign();

        /* Verify the signature */

        /* Initialize the Signature object for verification */
        PublicKey pub = pair.getPublic();
        /* Encode the public key into a byte array */
        byte[] encoded = pub.getEncoded();
        /* Get the public key from the encoded byte array */
        PublicKey fromEncoded = KeyFactory.getInstance("DSA", "SUN").generatePublic(new X509EncodedKeySpec(encoded));
        dsa.initVerify(fromEncoded);

        /* Update and verify the data */
        dsa.update(data);

        boolean verifies = dsa.verify(sig);
        Assert.assertTrue(verifies);
    } catch (Exception e) {
        System.err.println("Caught exception " + e.toString());
    }