问在Bouncycastle证书请求上添加KeyUsage扩展

EN

import org.bouncycastle.asn1.x509.KeyUsage;

KeyUsage keyUsage = new KeyUsage(KeyUsage.keyCertSign | KeyUsage.cRLSign);

X509Extension extension = new X509Extension(true, new DEROctetString(keyUsage));

... generate X500Name name and a SubjectPublicKeInfo spki ...
PKCS10CertificationRequestBuilder p10Builder =
        new PKCS10CertificationRequestBuilder(name,spki);
KeyUsage ku = new KeyUsage(KeyUsage.keyCertSign | KeyUsage.cRLSign);
ExtensionsGenerator extgen = new ExtensionsGenerator();
extgen.addExtension(Extension.keyUsage,true,ku);
p10Builder.addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest,
                        extgen.generate());
...set up your signer here ...
PKCS10CertificationRequest csr = p10Builder.build(signer);