其他回答说明如何全局配置客户端证书。 然而，如果你想通过编程方式为一个特定的连接定义客户端密钥，而不是在JVM上运行的每个应用程序上全局定义它，那么你可以像这样配置自己的SSLContext:

String keyPassphrase = "";

KeyStore keyStore = KeyStore.getInstance("PKCS12");
keyStore.load(new FileInputStream("cert-key-pair.pfx"), keyPassphrase.toCharArray());

SSLContext sslContext = SSLContexts.custom()
        .loadKeyMaterial(keyStore, null)
        .build();

HttpClient httpClient = HttpClients.custom().setSSLContext(sslContext).build();
HttpResponse response = httpClient.execute(new HttpGet("https://example.com"));

我已经用Spring Boot用双向SSL(客户端和服务器证书)连接到银行。所以在这里描述我所有的步骤，希望它能帮助到别人(我发现了最简单的工作解决方案):

生成证书请求:

生成私钥: openssl genrsa -des3 -passout pass:MY_PASSWORD -out user。关键的2048 生成证书请求: Openssl req -new -key user。退出用户。csr -passin pass:MY_PASSWORD

保持用户。密钥(和密码)和发送证书请求到银行

Receive 2 certificate: my client root certificate user.pem and bank root certificate: bank.crt Create Java keystore (enter key password and set keystore password): openssl pkcs12 -export -in user.pem -inkey user.key -out keystore.p12 -name clientId -CAfile ca.crt -caname root Don't pay attention on output: unable to write 'random state'. Java PKCS12 keystore.p12 created. Add into keystore bank.crt (for simplicity I've used one keystore): keytool -import -alias bankca -file bank.crt -keystore keystore.p12 -storepass MY_PASS Check keystore certificates by: keytool -list -keystore keystore.p12 Ready for Java code:) I've used Spring Boot RestTemplate with add org.apache.httpcomponents.httpcore dependency: @Bean("sslRestTemplate") public RestTemplate sslRestTemplate() throws Exception { char[] storePassword = appProperties.getSslStorePassword().toCharArray(); URL keyStore = new URL(appProperties.getSslStore()); SSLContext sslContext = new SSLContextBuilder() .loadTrustMaterial(keyStore, storePassword) // use storePassword twice (with key password do not work)!! .loadKeyMaterial(keyStore, storePassword, storePassword) .build(); // Solve "Certificate doesn't match any of the subject alternative names" SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE); CloseableHttpClient client = HttpClients.custom().setSSLSocketFactory(socketFactory).build(); HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(client); RestTemplate restTemplate = new RestTemplate(factory); // restTemplate.setMessageConverters(List.of(new Jaxb2RootElementHttpMessageConverter())); return restTemplate; }

JKS文件只是一个证书和密钥对的容器。 在客户端身份验证场景中，密钥的各个部分将位于这里:

客户端的存储区将包含客户端的私钥和公钥对。它称为密钥存储库。 服务器的存储区将包含客户端的公钥。它被称为信任库。

信任存储库和密钥存储库的分离不是强制的，但建议使用。它们可以是相同的物理文件。

要设置两个存储的文件系统位置，使用以下系统属性:

-Djavax.net.ssl.keyStore=clientsidestore.jks

在服务器端:

-Djavax.net.ssl.trustStore=serversidestore.jks

若要将客户端证书(公钥)导出到文件，以便将其复制到服务器，请使用

keytool -export -alias MYKEY -file publicclientkey.cer -store clientsidestore.jks

要将客户端的公钥导入到服务器的密钥存储库中，使用(正如海报中提到的，服务器管理员已经完成了这一操作)

keytool -import -file publicclientkey.cer -store serversidestore.jks

最终解决了所有问题，所以我来回答我自己的问题。这些是我用来解决我的特定问题的设置/文件;

客户端的密钥存储库是一个PKCS#12格式文件，包含

客户端的公共证书(在本例中由自签名CA签名) 客户端的私钥

例如，我使用OpenSSL的pkcs12命令来生成它;

openssl pkcs12 -export -in client.crt -inkey client.key -out client.p12 -name "Whatever"

提示:确保你得到最新的OpenSSL，而不是0.9.8h版本，因为它似乎有一个错误，不允许你正确生成PKCS#12文件。

当服务器显式地请求客户端进行身份验证时，Java客户端将使用这个PKCS#12文件向服务器提供客户端证书。请参阅维基百科上关于TLS的文章，了解用于客户端证书身份验证的协议实际上是如何工作的(还解释了为什么这里需要客户端私钥)。

客户端的信任库是一个直接的JKS格式文件，其中包含根证书或中间CA证书。这些CA证书将决定允许您与哪些端点通信，在这种情况下，它将允许您的客户端连接到提供由信任存储库的CA之一签名的证书的任何服务器。

例如，你可以使用标准的Java keytool来生成它;

keytool -genkey -dname "cn=CLIENT" -alias truststorekey -keyalg RSA -keystore ./client-truststore.jks -keypass whatever -storepass whatever
keytool -import -keystore ./client-truststore.jks -file myca.crt -alias myca

使用这个信任库，您的客户端将尝试与所有提供由myca.crt标识的CA签名的证书的服务器进行一次完整的SSL握手。

上面的文件严格地只针对客户端。当您还想设置服务器时，服务器需要自己的密钥和信任库文件。在这个网站上可以找到关于为Java客户端和服务器(使用Tomcat)设置一个完全工作的示例的很好的演练。

问题/评论/建议

Client certificate authentication can only be enforced by the server. (Important!) When the server requests a client certificate (as part of the TLS handshake), it will also provide a list of trusted CA's as part of the certificate request. When the client certificate you wish to present for authentication is not signed by one of these CA's, it won't be presented at all (in my opinion, this is weird behaviour, but I'm sure there's a reason for it). This was the main cause of my issues, as the other party had not configured their server properly to accept my self-signed client certificate and we assumed that the problem was at my end for not properly providing the client certificate in the request. Get Wireshark. It has great SSL/HTTPS packet analysis and will be a tremendous help debugging and finding the problem. It's similar to -Djavax.net.debug=ssl but is more structured and (arguably) easier to interpret if you're uncomfortable with the Java SSL debug output. It's perfectly possible to use the Apache httpclient library. If you want to use httpclient, just replace the destination URL with the HTTPS equivalent and add the following JVM arguments (which are the same for any other client, regardless of the library you want to use to send/receive data over HTTP/HTTPS): -Djavax.net.debug=ssl -Djavax.net.ssl.keyStoreType=pkcs12 -Djavax.net.ssl.keyStore=client.p12 -Djavax.net.ssl.keyStorePassword=whatever -Djavax.net.ssl.trustStoreType=jks -Djavax.net.ssl.trustStore=client-truststore.jks -Djavax.net.ssl.trustStorePassword=whatever

给定一个包含证书和私钥的p12文件(例如，由openssl生成)，下面的代码将对特定的HttpsURLConnection使用该文件:

    KeyStore keyStore = KeyStore.getInstance("pkcs12");
    keyStore.load(new FileInputStream(keyStorePath), keystorePassword.toCharArray());
    KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
    kmf.init(keyStore, keystorePassword.toCharArray());
    SSLContext ctx = SSLContext.getInstance("TLS");
    ctx.init(kmf.getKeyManagers(), null, null);
    SSLSocketFactory sslSocketFactory = ctx.getSocketFactory();

    HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
    connection.setSSLSocketFactory(sslSocketFactory);

SSLContext需要一些时间来初始化，因此可能需要缓存它。

Maven pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>some.examples</groupId>
    <artifactId>sslcliauth</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>sslcliauth</name>
    <dependencies>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.4</version>
        </dependency>
    </dependencies>
</project>

Java代码:

package some.examples;

import java.io.FileInputStream;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.net.ssl.SSLContext;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.apache.http.entity.InputStreamEntity;

public class SSLCliAuthExample {

private static final Logger LOG = Logger.getLogger(SSLCliAuthExample.class.getName());

private static final String CA_KEYSTORE_TYPE = KeyStore.getDefaultType(); //"JKS";
private static final String CA_KEYSTORE_PATH = "./cacert.jks";
private static final String CA_KEYSTORE_PASS = "changeit";

private static final String CLIENT_KEYSTORE_TYPE = "PKCS12";
private static final String CLIENT_KEYSTORE_PATH = "./client.p12";
private static final String CLIENT_KEYSTORE_PASS = "changeit";

public static void main(String[] args) throws Exception {
    requestTimestamp();
}

public final static void requestTimestamp() throws Exception {
    SSLConnectionSocketFactory csf = new SSLConnectionSocketFactory(
            createSslCustomContext(),
            new String[]{"TLSv1"}, // Allow TLSv1 protocol only
            null,
            SSLConnectionSocketFactory.getDefaultHostnameVerifier());
    try (CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(csf).build()) {
        HttpPost req = new HttpPost("https://changeit.com/changeit");
        req.setConfig(configureRequest());
        HttpEntity ent = new InputStreamEntity(new FileInputStream("./bytes.bin"));
        req.setEntity(ent);
        try (CloseableHttpResponse response = httpclient.execute(req)) {
            HttpEntity entity = response.getEntity();
            LOG.log(Level.INFO, "*** Reponse status: {0}", response.getStatusLine());
            EntityUtils.consume(entity);
            LOG.log(Level.INFO, "*** Response entity: {0}", entity.toString());
        }
    }
}

public static RequestConfig configureRequest() {
    HttpHost proxy = new HttpHost("changeit.local", 8080, "http");
    RequestConfig config = RequestConfig.custom()
            .setProxy(proxy)
            .build();
    return config;
}

public static SSLContext createSslCustomContext() throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException, KeyManagementException, UnrecoverableKeyException {
    // Trusted CA keystore
    KeyStore tks = KeyStore.getInstance(CA_KEYSTORE_TYPE);
    tks.load(new FileInputStream(CA_KEYSTORE_PATH), CA_KEYSTORE_PASS.toCharArray());

    // Client keystore
    KeyStore cks = KeyStore.getInstance(CLIENT_KEYSTORE_TYPE);
    cks.load(new FileInputStream(CLIENT_KEYSTORE_PATH), CLIENT_KEYSTORE_PASS.toCharArray());

    SSLContext sslcontext = SSLContexts.custom()
            //.loadTrustMaterial(tks, new TrustSelfSignedStrategy()) // use it to customize
            .loadKeyMaterial(cks, CLIENT_KEYSTORE_PASS.toCharArray()) // load client certificate
            .build();
    return sslcontext;
}

}