https是加密的http协议，通过不对称加密确认对称加密的密钥，之后使用对称加密进行通信。
通信流程：
客户端
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服务端
1. 请求服务器 并添加支持的 非对称加密算法 对称加密算法 hash算法
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2. 服务器返回证书，加密算法的种类，
3.验证证书的真实性
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4.生成后期通信的通信密码，并使用证书中的公钥对通信密码进行加密
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5. 将握手信息使用通信密码加密，并使用hash算法进行计算。
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6. 使用私钥进行加密，获取通信密码。对握手信息使用私钥进行加密，并通过hash比对通信秘密的正确性, hash握手信息，使用通信密码进行加密
7.使用通信密码进行解密握手信息，同时计算hash，确认双发的通信密钥是一样的。
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8. 握手结束，使用通信秘密进行加密
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http 握手
在TCP/IP协议中，TCP协议提供可靠的连接服务，采用三次握手建立一个连接。
第一次握手：建立连接时，客户端发送syn包(syn=j)到服务器，并进入SYN_SEND状态，等待服务器确认；
第二次握手：服务器收到syn包，必须确认客户的SYN(ack=j+1)，同时自己也发送一个SYN包(syn=k)，即SYN+ACK包，此时服务器进入SYN_RECV状态； 第三次握手：客户端收到服务器的SYN＋ACK包，向服务器发送确认包ACK(ack=k+1)，此包发送完毕，客户端和服务器进入ESTABLISHED状态，完成三次握手。 完成三次握手，客户端与服务器开始传送数据.
http端口80 https 443
tomcat 开启https
生成证书 如果没有的话
keytool -genkey -alias tomcat -keyalg RSA 在user目录下(mac).keystore 文件
填写一些信息就可以了
今天tomcat 的配置文件进行配置 server.xml
maxThreads="150" SSLEnabled="true" scheme="https" secure="true" keystoreFile="${user.home}/.keystore" keystorePass="_密码_" clientAuth="false" sslProtocal="TLS">
启动tomcat ，进入https://localhost:8443 , 信任证书后，看见tomcat就配置成功了。
android UrlConnection 使用https
把证书放在assets文件下
打开应该是这样的：
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
官方的例子
private void googleTest() throws CertificateException, IOException, KeyStoreException, NoSuchAlgorithmException, KeyManagementException {
// Load CAs from an InputStream
// (could be from a resource or ByteArrayInputStream or ...)
CertificateFactory cf = CertificateFactory.getInstance("X.509");
// From https://www.washington.edu/itconnect/security/ca/load-der.crt
//载入证书
InputStream caInput = new BufferedInputStream(getAssets().open("uwca.crt"));
Certificate ca;
try {
ca = cf.generateCertificate(caInput);
System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());
} finally {
caInput.close();
}
//添加我们都证书，，来认证
// Create a KeyStore containing our trusted CAs
String keyStoreType = KeyStore.getDefaultType();
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(null, null);
keyStore.setCertificateEntry("ca", ca);
// Create a TrustManager that trusts the CAs in our KeyStore
String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
tmf.init(keyStore);
// Create an SSLContext that uses our TrustManager
SSLContext context = SSLContext.getInstance("TLS");
context.init(null, tmf.getTrustManagers(), null);
// Tell the URLConnection to use a SocketFactory from our SSLContext
URL url = new URL("https://www.baidu.com/");
HttpsURLConnection urlConnection =
(HttpsURLConnection) url.openConnection();
urlConnection.setSSLSocketFactory(context.getSocketFactory());
InputStream in = urlConnection.getInputStream();
// copyInputStreamToOutputStream(in, System.out);
String str = null;
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
while ((str = reader.readLine()) != null) {
Log.i(Tag, "获取到的信息：" + str);
}
reader.close();
in.close();
}
exception
javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
证书没有通过验证,证书一定要和我们访问的链接匹配。
官方教材
