The specific functions of this class: obtain the private key according to the pfx certificate, obtain the private key object according to the private key byte array, obtain the public key according to the public key byte array, obtain the certificate object according to the pfx certificate, and generate according to the private key, public key certificate and password pkcs12, according to the private key, public key certificate, key, synthesized into a pfx file, depends on the toolkit: commons-io
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.FileUtils;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.security.KeyFactory;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Enumeration;
/**
* Created by ssl on 2017/9/5.
*/
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 static void main(String[] args) throws Exception {
String pfxPath = "C:\\Users\\49383\\Desktop\\文件\\国新测试证书-1.pfx";
String password = "1";
//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\\49383\\Desktop\\文件\\009\\009.pfx"));
System.out.println(savePath);
}
}