话不多说，直接上代码，逻辑挺简单的
依赖pom文件
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.65</version>
<scope>compile</scope>
</dependency>
RSA的
import org.bouncycastle.util.encoders.Base64;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.security.PublicKey;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
public class testRSA{
public static void main(String[] args) {
String filePath ="E:\\sc银行yhtest01.cer";
String key ="";
try {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
FileInputStream in =new FileInputStream(filePath);//生成一个证书对象并使用从输入流 inStream 中读取的数据对它进行初始化。
X509Certificate cert = (X509Certificate) cf.generateCertificate(in);
PublicKey publicKey = cert.getPublicKey();
key = Base64.toBase64String(publicKey.getEncoded());
System.out.println("base64公钥：" + key);
}catch (CertificateException e) {
e.printStackTrace();
}catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
国密的
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Base64;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.NoSuchProviderException;
import java.security.PublicKey;
import java.security.Security;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
public class testSM2 {
public static void main(String[] args)throws CertificateException, NoSuchProviderException, IOException {
String cerPath ="E:\\bocadmin@org.ctfu.cer";
X509Certificate x509Certificate =null;
//国密证书使用了自有的椭圆曲线，无法使用JDK自带的java.security解析证书，需要引入BouncyCastle的BC库支持国密算法
Security.addProvider(new BouncyCastleProvider());//bcprov-jdk15on需1.59以上的版本
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509","BC");
FileInputStream fileInputStream =new FileInputStream(cerPath);
x509Certificate = (X509Certificate) certificateFactory.generateCertificate(fileInputStream);
fileInputStream.close();
PublicKey publicKey = x509Certificate.getPublicKey();
String key = Base64.toBase64String(publicKey.getEncoded());
byte[] bytes = publicKey.getEncoded();
String publicKeyHex =bytesToHex(bytes);
System.out.println("base64公钥：" + key);
System.out.println("16进制公钥：" + publicKeyHex);
}
//将publickey数组转成16进制字符串
public static String bytesToHex(byte[] bytes) {
StringBuffer sb =new StringBuffer();
for (int i =0; i < bytes.length; i++) {
String hex = Integer.toHexString(bytes[i] &0xFF);
if (hex.length() <2) {
sb.append(0);
}
sb.append(hex);
}
return sb.toString();
}
}
