bouncycastle创建csr

public static void main(String[] args) {
        String subjectDN = "CN=duwenlei";
        String algorithm = "";
        try {
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(2048);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            algorithm = keyPair.getPrivate().getAlgorithm();
            PKCS10CertificationRequestBuilder builder = new PKCS10CertificationRequestBuilder(new X500Name(subjectDN)
                    ,SubjectPublicKeyInfo.getInstance(keyPair.getPublic().getEncoded()));            JcaContentSignerBuilder jcaBuilder = new JcaContentSignerBuilder("sha1withrsa");
//            jcaBuilder.setProvider(provider); 这里可以添加提供者
            ContentSigner contentSigner = jcaBuilder.build(keyPair.getPrivate());
            builder.build(contentSigner);
            System.out.println(builder.toString());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (OperatorCreationException e) {
            e.printStackTrace();
        }    }

需要用到的包：bcmail-jdk15-1.46.jar，bcprov-jdk15-1.46.jar，用不到：bctsp-jdk15-1.46.jar