小編典典
使用BouncyCastle的最新版本- 1.55 1.66
通過@Bewusstsein更新答案。截至此答案(5/11/2017)，最新版本不推薦使用bouncycastle類。如果您使用的是1.55或更高版本：
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)); //
Calendar calendar = Calendar.getInstance();
calendar.setTime(startDate);
calendar.add(Calendar.YEAR, 1); //
Date endDate = calendar.getTime();
String signatureAlgorithm = "SHA256WithRSA"; //
ContentSigner contentSigner = new JcaContentSignerBuilder(signatureAlgorithm).build(keyPair.getPrivate());
JcaX509v3CertificateBuilder certBuilder = new JcaX509v3CertificateBuilder(dnName, certSerialNumber, startDate, endDate, dnName, keyPair.getPublic());
// Extensions --------------------------
// Basic Constraints
BasicConstraints basicConstraints = new BasicConstraints(true); //
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));
}
2020-11-05