Сгенерировать сертификат сертификата x509 в JAVA

Question

Я успешно делаю сертификат X.509 из запроса сертификата.

Тем не менее, мне нужно вставить информационный поток CERT Path в сертификат X.509.

Я знаю, что мне нужно использовать метод CertPathBuilder, но я не знаю, как его использовать.

Не могли бы вы дать мне пример кода, подходящий для следующего кода?

import java.io.FileInputStream; 
import java.io.FileWriter; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.math.BigInteger; 
import java.security.KeyPair; 
import java.security.SecureRandom; 
import java.security.cert.X509Certificate; 
import java.util.Date; 
import java.util.Enumeration; 
import org.bouncycastle.asn1.ASN1Set; 
import org.bouncycastle.asn1.DERObjectIdentifier; 
import org.bouncycastle.asn1.pkcs.Attribute; 
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers; 
import org.bouncycastle.asn1.x509.BasicConstraints; 
import org.bouncycastle.asn1.x509.ExtendedKeyUsage; 
import org.bouncycastle.asn1.x509.KeyPurposeId; 
import org.bouncycastle.asn1.x509.KeyUsage; 
import org.bouncycastle.asn1.x509.X509Extension; 
import org.bouncycastle.asn1.x509.X509Extensions; 
import org.bouncycastle.jce.PKCS10CertificationRequest; 
import org.bouncycastle.openssl.PEMReader; 
import org.bouncycastle.openssl.PEMWriter; 
import org.bouncycastle.x509.X509V3CertificateGenerator; 
import org.bouncycastle.x509.extension.AuthorityKeyIdentifierStructure; 
import org.bouncycastle.x509.extension.SubjectKeyIdentifierStructure; 
import chapter6.X509V1CreateExample; 


//example of a basic CA 
public class PKCS10CertCreateExample 
{ 
    public static X509Certificate[] buildChain() throws Exception 
    { 

     PEMReader pRd = new PEMReader(
        new InputStreamReader(
         new FileInputStream("pkcs10.req"))); 

     PKCS10CertificationRequest request = (PKCS10CertificationRequest)pRd.readObject(); 





     //create a root certificate 
     KeyPair rootPair=chapter6.Utils.generateRSAKeyPair(); 
    X509Certificate rootCert = X509V1CreateExample.generateV1Certificate(rootPair); 

    //validate the certification request 
    if(!request.verify("BC")) 
    { 
     System.out.println("request failed to verify!"); 
     System.exit(1); 
    } 

    //create the certificate using the information in the request 
    X509V3CertificateGenerator certGen = new X509V3CertificateGenerator(); 

    certGen.setSerialNumber(BigInteger.valueOf(System.currentTimeMillis())); 
    certGen.setIssuerDN(rootCert.getSubjectX500Principal()); 
    certGen.setNotBefore(new Date(System.currentTimeMillis())); 
    certGen.setNotAfter(new Date(System.currentTimeMillis()+50000)); 
    certGen.setSubjectDN(request.getCertificationRequestInfo().getSubject()); 
    certGen.setPublicKey(request.getPublicKey("BC")); 
    certGen.setSignatureAlgorithm("SHA256WithRSAEncryption"); 

    certGen.addExtension(X509Extensions.AuthorityKeyIdentifier, false, new AuthorityKeyIdentifierStructure(rootCert)); 
    certGen.addExtension(X509Extensions.SubjectKeyIdentifier, false, new SubjectKeyIdentifierStructure(request.getPublicKey("BC"))); 
    certGen.addExtension(X509Extensions.BasicConstraints, true, new BasicConstraints(false)); 
    //certGen.addExtension(X509Extensions.KeyUsage, true, new BasicConstraints(false)); 
    certGen.addExtension(X509Extensions.KeyUsage, true, new KeyUsage(KeyUsage.digitalSignature | KeyUsage.keyEncipherment)); 
    certGen.addExtension(X509Extensions.ExtendedKeyUsage, true, new ExtendedKeyUsage(KeyPurposeId.id_kp_serverAuth)); 

    //extract the extension request attribute 
    ASN1Set attributes = request.getCertificationRequestInfo().getAttributes(); 

    for(int i=0;i!=attributes.size();i++) 
    { 
     Attribute attr = Attribute.getInstance(attributes.getObjectAt(i)); 

     //process extension request 
     if(attr.getAttrType().equals(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest)) 
     { 
       X509Extensions extensions = X509Extensions.getInstance(attr.getAttrValues().getObjectAt(0)); 

       Enumeration<?> e = extensions.oids(); 
       while(e.hasMoreElements()) 
       { 
        DERObjectIdentifier oid = (DERObjectIdentifier)e.nextElement(); 
        X509Extension ext = extensions.getExtension(oid); 

        certGen.addExtension(oid, ext.isCritical(), ext.getValue().getOctets()); 
       } 
      }  
     } 
    X509Certificate issuedCert = certGen.generateX509Certificate(rootPair.getPrivate()); 
    return new X509Certificate[]{issuedCert, rootCert}; 
    } 

    public static void pemEncodeToFile(String filename, Object obj, char[] password) throws Exception{ 
    PEMWriter pw = new PEMWriter(new FileWriter(filename)); 
     if (password != null && password.length > 0) { 
      pw.writeObject(obj, "DESEDE", password, new SecureRandom()); 
     } else { 
      pw.writeObject(obj); 
     } 
     pw.flush(); 
     pw.close(); 
    } 

    public static void main(String[] args) throws Exception 
    { 
     X509Certificate[] chain = buildChain(); 
     PEMWriter pemWrt = new PEMWriter(new OutputStreamWriter(System.out)); 
     pemWrt.writeObject(chain[0]); 
     pemEncodeToFile("pkcs10.pem", chain[0], null); 
     pemWrt.close(); 

    } 

} 

Answer 1

Код ниже может помочь вам

CertPathBuilder cpb = CertPathBuilder.getInstance("PKIX"); 
X509CertSelector certSelector = new X509CertSelector(); 
certSelector.setCertificate((X509Certificate) myKeyStore.getCertificate("mykey")); 
PKIXBuilderParameters cpp = new PKIXBuilderParameters(trustAnchors, certSelector); 
cpp.addCertStore(cs); 
cpp.setRevocationEnabled(true); 
cpp.setMaxPathLength(6); 
cpp.setDate(new Date()); 

CertPathBuilderResult a = cpb.build(cpp); 
CertPath certPath = a.getCertPath();