【转载】OpenSSL 提取 pfx 数字证书公钥与私钥
转自https://www.cnblogs.com/Irving/p/9551110.html
OpenSSL 提取 pfx 数字证书公钥与私钥
由于之前生产环境已经使用了 Identityserver4 用来做授权与认证的服务，而新项目采用 Spring Cloud 微服务体系，一方面 Spring Cloud 官方暂时只支持 OAuth2.0 协议，还不支持 OpenID Connect 协议（由于考虑到前项目后端分离登陆安全相关的功能已经做好了，不考虑再次修改 Spring Security 二次开发与其他开源框架如：Keycloak）；另外默认 Identityserver4 也支持 JwtToken ，现在的思路是登陆使用 Identityserver4 的 OpenID Connect 协议认证，授权是在 Zuul 网关中获得 Identityserver4 服务端的公钥从而进行验签，所以就有了这篇文章。
创建证书
#生成私钥文件 openssl genrsa -out idsrv4.key 2048 #创建证书签名请求文件 CSR（Certificate Signing Request），用于提交给证书颁发机构（即 Certification Authority (CA)）即对证书签名，申请一个数字证书。 openssl req -new -key idsrv4.key -out idsrv4.csr #生成自签名证书（证书颁发机构（CA）签名后的证书，因为自己做测试那么证书的申请机构和颁发机构都是自己,crt 证书包含持有人的信息，持有人的公钥，以及签署者的签名等信息。当用户安装了证书之后，便意味着信任了这份证书，同时拥有了其中的公钥。） openssl x509 -req -days 365 -in idsrv4.csr -signkey idsrv4.key -out idsrv4.crt #自签名证书与私匙合并成一个文件 openssl pkcs12 -export -in idsrv4.crt -inkey idsrv4.key -out idsrv4.pfx 或 openssl req -newkey rsa:2048 -nodes -keyout idsrv4.key -x509 -days 365 -out idsrv4.cer openssl pkcs12 -export -in idsrv4.cer -inkey idsrv4.key -out idsrv4.pfx
OpenSSL 提取 pfx 证书公钥与私钥
从pfx证书中提取密钥信息，并转换为key格式（pfx使用pkcs12模式补足） 提取密钥对(如果pfx证书已加密，会提示输入密码) openssl pkcs12 -in idsrv4.pfx -nocerts -nodes -out idsrv4.key 从密钥对提取公钥 openssl rsa -in idsrv4.key -pubout -out idsrv4_pub.key 从密钥对提取私钥 openssl rsa -in idsrv4.key -out idsrv4_pri.key 因为RSA算法使用的是 pkcs8 模式补足，需要对提取的私钥进一步处理得到最终私钥 openssl pkcs8 -topk8 -inform PEM -in idsrv4_pri.key -outform PEM -nocrypt
代码方式获取
public class PFXUtil {
/**
* 获取RSA算法的keyFactory
*
* @return
*/
private static KeyFactory getKeyFactory() throws Exception {
return getKeyFactory("RSA");
}
/**
* 获取指定算法的keyFactory
*
* @param algorithm
* @return
*/
private static KeyFactory getKeyFactory(String algorithm) throws Exception {
KeyFactory keyFactory = KeyFactory.getInstance(algorithm);
return keyFactory;
}
/**
* 根据pfx证书获取keyStore
*
* @param pfxData
* @param password
* @return
* @throws Exception
*/
private static KeyStore getKeyStore(byte[] pfxData, String password) throws Exception {
KeyStore keystore = KeyStore.getInstance("PKCS12");
keystore.load(new ByteArrayInputStream(pfxData), password.toCharArray());
return keystore;
}
/**
* 根据pfx证书得到私钥
*
* @param pfxData
* @param password
* @throws Exception
*/
public static PrivateKey getPrivateKeyByPfx(byte[] pfxData, String password) throws Exception {
PrivateKey privateKey = null;
KeyStore keystore = getKeyStore(pfxData, password);
Enumeration<String> enums = keystore.aliases();
String keyAlias = "";
while (enums.hasMoreElements()) {
keyAlias = enums.nextElement();
if (keystore.isKeyEntry(keyAlias)) {
privateKey = (PrivateKey) keystore.getKey(keyAlias, password.toCharArray());
}
}
return privateKey;
}
/**
* 根据pfx证书得到私钥
*
* @param pfxPath
* @param password
* @return
* @throws Exception
*/
public static PrivateKey getPrivateKeyByPfx(String pfxPath, String password) throws Exception {
File pfxFile = new File(pfxPath);
return getPrivateKeyByPfx(FileUtils.readFileToByteArray(pfxFile), password);
}
/**
* 根据私钥字节数组获取私钥对象
*
* @param privateKeyByte
* @return
* @throws Exception
*/
public static PrivateKey getPrivateKey(byte[] privateKeyByte) throws Exception {
PrivateKey privateKey = null;
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyByte);
KeyFactory keyFactory = getKeyFactory();
privateKey = keyFactory.generatePrivate(keySpec);
return privateKey;
}
/**
* 根据私钥Base64字符串获取私钥对象
*
* @param privateKeyStr
* @return
* @throws Exception
*/
public static PrivateKey getPrivateKey(String privateKeyStr) throws Exception {
byte[] privateKeyByte = Base64.decodeBase64(privateKeyStr);
return getPrivateKey(privateKeyByte);
}
/**
* 根据公钥字节数组获取公钥
*
* @param publicKeyByte 公钥字节数组
* @return
* @throws Exception
*/
public static PublicKey getPublicKey(byte[] publicKeyByte) throws Exception {
PublicKey publicKey = null;
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyByte);
KeyFactory keyFactory = getKeyFactory();
publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
}
/**
* 根据公钥base64字符串获取公钥
*
* @param publicKeyStr Base64编码后的公钥字节数组
* @return
* @throws Exception
*/
public static PublicKey getPublicKey(String publicKeyStr) throws Exception {
byte[] publicKeyByte = Base64.decodeBase64(publicKeyStr);
return getPublicKey(publicKeyByte);
}
/**
* 根据pfx证书获取证书对象
*
* @param pfxData pfx的字节数组
* @param password pfx证书密码
* @return
* @throws Exception
*/
public static X509Certificate getX509Certificate(byte[] pfxData, String password) throws Exception {
X509Certificate x509Certificate = null;
KeyStore keystore = getKeyStore(pfxData, password);
Enumeration<String> enums = keystore.aliases();
String keyAlias = "";
while (enums.hasMoreElements()) {
keyAlias = enums.nextElement();
if (keystore.isKeyEntry(keyAlias)) {
x509Certificate = (X509Certificate) keystore.getCertificate(keyAlias);
}
}
return x509Certificate;
}
/**
* 根据pfx证书获取证书对象
*
* @param pfxPath pfx证书路径
* @param password pfx证书密码
* @return
* @throws Exception
*/
public static X509Certificate getX509Certificate(String pfxPath, String password) throws Exception {
File pfxFile = new File(pfxPath);
return getX509Certificate(FileUtils.readFileToByteArray(pfxFile), password);
}
//生成pkcs12
/**
* 根据私钥、公钥证书、密码生成pkcs12
*
* @param privateKey 私钥
* @param x509Certificate 公钥证书
* @param password 需要设置的密钥
* @return
* @throws Exception
*/
public static byte[] generatorPkcx12(PrivateKey privateKey, X509Certificate x509Certificate, String password)
throws Exception {
Certificate[] chain = {x509Certificate};
KeyStore keystore = KeyStore.getInstance("PKCS12");
keystore.load(null, password.toCharArray());
keystore.setKeyEntry(x509Certificate.getSerialNumber().toString(), privateKey, password.toCharArray(), chain);
ByteArrayOutputStream bytesos = new ByteArrayOutputStream();
keystore.store(bytesos, password.toCharArray());
byte[] bytes = bytesos.toByteArray();
return bytes;
}
//合成pfx
/**
* 根据私钥、公钥证书、密钥，保存为pfx文件
*
* @param privateKey 私钥
* @param x509Certificate 公钥证书
* @param password 打开pfx的密钥
* @param saveFile 保存的文件
* @return
* @throws Exception
*/
public static String generatorPFX(PrivateKey privateKey, X509Certificate x509Certificate, String password, File
saveFile) throws Exception {
//判断文件是否存在
if (!saveFile.exists()) {
//判断文件的目录是否存在
if (!saveFile.getParentFile().exists()) {
saveFile.getParentFile().mkdirs();
}
saveFile.createNewFile();
}
byte[] pkcs12Byte = generatorPkcx12(privateKey, x509Certificate, password);
FileUtils.writeByteArrayToFile(saveFile, pkcs12Byte);
return saveFile.getPath();
}
}
public class TestRsa {
@Test
public void contextLoads() {
String pfxPath ="D:\\github\\SecuringForWebAPI\\IdSrv4.HostSrv\\Certs\\idsrv4.pfx";
String password = "123456";
try {
//私钥：pfx文件中获取私钥对象
PrivateKey privateKey = getPrivateKeyByPfx(pfxPath, password);
byte[] privateKeyByte = privateKey.getEncoded();
String privateKeyStr = Base64.encodeBase64String(privateKeyByte);
System.out.println("私钥Base64字符串：" + privateKeyStr);
//=====私钥Base64字符串转私钥对象
PrivateKey privateKey2 = getPrivateKey(privateKeyStr);
System.out.println("私钥Base64字符串2：" + Base64.encodeBase64String(privateKey2.getEncoded()));
//证书：从pfx文件中获取证书对象
X509Certificate certificate = getX509Certificate(pfxPath, password);
System.out.println("证书主题：" + certificate.getSubjectDN().getName());
String publicKeyStr = Base64.encodeBase64String(certificate.getPublicKey().getEncoded());
System.out.println("公钥Base64字符串：" + publicKeyStr);
//=====根据公钥Base64字符串获取公钥对象
System.out.println("公钥Base64字符串2：" + Base64.encodeBase64String(getPublicKey(publicKeyStr).getEncoded()));
// //PFX：合成pfx（需要私钥、公钥证书）
// String savePath = generatorPFX(privateKey, certificate, "1", new File
// ("C:\\Users\\irving\\Desktop\\idrv4.pfx"));
// System.out.println(savePath);
} catch (Exception e) {
e.printStackTrace();
}
}
}
REFER:
OpenSSL使用文档
https://github.com/KaiZhang890/openssl-howto
