Examples with BcRSAContentSignerBuilder org.spongycastle.operator.bc.BcRSAContentSignerBuilder used on opensource projects

Example 1 with BcRSAContentSignerBuilder

use of org.spongycastle.operator.bc.BcRSAContentSignerBuilder in project android by nextcloud.

the class CsrHelper method generateCSR.

/**
 * Create the certificate signing request (CSR) from private and public keys
 *
 * @param keyPair the KeyPair with private and public keys
 * @param userId userId of CSR owner
 * @return PKCS10CertificationRequest with the certificate signing request (CSR) data
 * @throws IOException thrown if key cannot be created
 * @throws OperatorCreationException thrown if contentSigner cannot be build
 */
private static PKCS10CertificationRequest generateCSR(KeyPair keyPair, String userId) throws IOException, OperatorCreationException {
    String principal = "CN=" + userId;
    AsymmetricKeyParameter privateKey = PrivateKeyFactory.createKey(keyPair.getPrivate().getEncoded());
    AlgorithmIdentifier signatureAlgorithm = new DefaultSignatureAlgorithmIdentifierFinder().find("SHA1WITHRSA");
    AlgorithmIdentifier digestAlgorithm = new DefaultDigestAlgorithmIdentifierFinder().find("SHA-1");
    ContentSigner signer = new BcRSAContentSignerBuilder(signatureAlgorithm, digestAlgorithm).build(privateKey);
    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());
    return csrBuilder.build(signer);
}