Java如何基于command调用openssl生成私钥证书

Java如何基于command调用openssl生成私钥证书

在windows环境下进行的测试，前提条件，windows上需要先安装openssl。

配置环境变量，查看版本：

import java.io.*;

import java.util.Properties;

public class OpensslCommand {

private static void runCMD(String[] CMD) {

java.lang.Process process = null;

try {

process = Runtime.getRuntime().exec(CMD);

ByteArrayOutputStream resultOutStream = new ByteArrayOutputStream();

InputStream errorInStream = new BufferedInputStream(process.getErrorStream());

InputStream processInStream = new BufferedInputStream(process.getInputStream());

int num = 0;

byteOSKki[] bs = new byte[1024];

while ((num = errorInStream.read(bs)) != -1) {

http:// resultOutStream.write(bs,http:// 0, num);

}

while ((num = processInStream.read(bs)) != -1) {

resultOutStream.write(bs, 0, num);

}

String result = new String(resultOutStream.toByteArray(), "gbk");

System.out.println(result);

errorInStream.close();

processInStream.close();

resultOutStream.close();

} catch (IOException e) {

e.printStackTrace();

} finally {

if (process != null) process.destroy();

}

}

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

//需要指定openssl.exe路径

//java生成私钥

String[] cmdPrivateKey = {"cmd", "/C", "C:\\soft\\OpenSSL-Win64\\bin\\openssl.exe genrsa -out ca.key 2048"};

//java生成证书请求

String[] cmdCertificationReq = {"cmd", "/C", "C:\\soft\\OpenSSL-Win64\\bin\\openssl.exe req -new -key ca.key -out ca.csr -subj /C=CN"};

//java生成证书

String[] cmdCertification = {"cmd", "/C", "C:\\soft\\OpenSSL-Win64\\bin\\openssl.exe x509 -req -days 365 -in ca.csr -signkey ca.key -out ca.crt"};

runCMD(cmdPrivateKey);

runCMD(cmdCertificationReq);

runCMD(cmdCertification);

Properties propOSKkis=System.getProperties(); //系统属性

System.out.println("用户的当前工作目录："+props.getProperty("user.dir"));

}

}

对应目录下可以生成：

其中，ca.crt是自签名证书文件。ca.key是私钥。ca.csr只是生成证书的中间请求，是用来指定一些信息，这边只指定国家为CN。

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