help generate csr

[www036]

I'm a newbie, how to generate a csr string to get the same value as the csr from the java code below. Shield is great, hope to get help, thanks a lot.

/**
* Create the certificate signing request (CSR) from private and public keys
*/
public static String generateCSR(KeyPair keyPair, String deviceId) throws IOException,
OperatorCreationException {
String principal = String.format("CN=%s, O=, OU=, C=ZH", "CM-" + deviceId);
Logan.debug(principal);
ContentSigner signer = new JcaContentSignerBuilder("SHA256withRSA").build(keyPair.getPrivate());
PKCS10CertificationRequestBuilder csrBuilder = new JcaPKCS10CertificationRequestBuilder(
new X500Name(principal), keyPair.getPublic());
ExtensionsGenerator extensionsGenerator = new ExtensionsGenerator();
extensionsGenerator.addExtension(Extension.basicConstraints, true, new BasicConstraints(
true));
csrBuilder.addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest,
extensionsGenerator.generate());
StringWriter writer = new StringWriter();
PemWriter pemWriter = new PemWriter(writer);
pemWriter.writeObject(new PemObject("CERTIFICATE REQUEST", csrBuilder.build(signer).getEncoded()));
pemWriter.flush();
pemWriter.close();
return writer.toString();
}

public static KeyPair generateSelfSignedKeyPair(String deviceId) {
try {
java.security.KeyPairGenerator generator = KeyPairGenerator.getInstance(
KeyProperties.KEY_ALGORITHM_RSA, "AndroidKeyStore");
Date now = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(now);
calendar.set(Calendar.YEAR, calendar.get(Calendar.YEAR) + 1);
Date period = calendar.getTime();
generator.initialize(new KeyGenParameterSpec.Builder(
deviceId,
KeyProperties.PURPOSE_SIGN | KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
.setUserAuthenticationRequired(false)
.setCertificateNotBefore(now)
.setCertificateNotBefore(period)
.setSignaturePaddings(KeyProperties.SIGNATURE_PADDING_RSA_PKCS1)
.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_PKCS1)
.setDigests(KeyProperties.DIGEST_SHA256, KeyProperties.DIGEST_SHA384, KeyProperties.DIGEST_SHA512)
.setKeySize(2048)
.build()
);
return generator.generateKeyPair();
} catch (Exception error) {
Logan.error(error);
}
return null;
}