我想在java中创建一个CA自签名证书。 我已经使用充气城堡创建了自签名证书,但是如何将此证书的基本约束添加为CA证书。 谢谢
答案 0 :(得分:0)
您可以使用以下代码创建一个basicConstraints
扩展程序的自签名证书:
public static Certificate selfSign(KeyPair keyPair, String subjectDN) throws OperatorCreationException, CertificateException, IOException
{
Provider bcProvider = new BouncyCastleProvider();
Security.addProvider(bcProvider);
long now = System.currentTimeMillis();
Date startDate = new Date(now);
X500Name dnName = new X500Name(subjectDN);
BigInteger certSerialNumber = new BigInteger(Long.toString(now)); // <-- Using the current timestamp as the certificate serial number
Calendar calendar = Calendar.getInstance();
calendar.setTime(startDate);
calendar.add(Calendar.YEAR, 1); // <-- 1 Yr validity
Date endDate = calendar.getTime();
String signatureAlgorithm = "SHA256WithRSA"; // <-- Use appropriate signature algorithm based on your keyPair algorithm.
ContentSigner contentSigner = new JcaContentSignerBuilder(signatureAlgorithm).build(keyPair.getPrivate());
JcaX509v3CertificateBuilder certBuilder = new JcaX509v3CertificateBuilder(dnName, certSerialNumber, startDate, endDate, dnName, keyPair.getPublic());
// Extensions --------------------------
// Basic Constraint
BasicConstraints basicConstraints = new BasicConstraints(true); // <-- true for CA, false for EndEntity
certBuilder.addExtension(new ASN1ObjectIdentifier("2.5.29.19"), true, basicConstraints); // Basic Constraints is usually marked as critical.
// -------------------------------------
return new JcaX509CertificateConverter().setProvider(bcProvider).getCertificate(certBuilder.build(contentSigner));
}