Java 如何使用bouncycastle从pkcs7文件获取证书？

大家好！我的问题是：我有一个.pkcs7文件，它包含预打包的CSR，我想从中获取CSR。我如何使用bouncycastle进行此操作

我试着用PEMReader，但没用

下一个例外是：

线程“main”java.lang.IllegalArgumentException中的异常：工厂中的未知对象：org.bouncycastle.asn1.ASN1ObjectIdentifier
位于org.bouncycastle.asn1.pkcs.CertificationRequestInfo.getInstance（未知源）
在org.bouncycastle.asn1.pkcs.CertificationRequest上（未知来源）
请访问org.bouncycastle.jce.PKCS10CertificationRequest。（未知来源）

谢谢大家

我找到了解决办法

KeyStore keystore = KeyStore.getInstance("PKCS12", "BC");
keystore.load (new FileInputStream(PATH+"//test.p12"), "testpassword".toCharArray());
PrivateKey privateKey = (PrivateKey)keystore.getKey("testclientcert", "testpassword".toCharArray());

PEMReader pemReader = new PEMReader(new FileReader(filename));
ContentInfo object = (ContentInfo)pemReader.readObject();

CMSEnvelopedDataParser envDataParser = new CMSEnvelopedDataParser(object.getEncoded());
RecipientInformationStore recipients = envDataParser.getRecipientInfos();
Collection envCollection = recipients.getRecipients();
Iterator it = envCollection.iterator();
RecipientInformation recipient = (RecipientInformation) it.next();
byte[] result = recipient.getContent(privateKey, "BC");
String base64Encoded = new String(Base64.encode(result));

System.out.println(base64Encoded);

---

base64Encoded将与encoded csr匹配。

您得到的错误是什么？实际上似乎是PKCS12的解决方案？

Exception in thread "main" java.lang.IllegalArgumentException: unknown object in factory: org.bouncycastle.asn1.ASN1ObjectIdentifier
    at org.bouncycastle.asn1.pkcs.CertificationRequestInfo.getInstance(Unknown Source)
    at org.bouncycastle.asn1.pkcs.CertificationRequest.(Unknown Source)
    at org.bouncycastle.jce.PKCS10CertificationRequest.(Unknown Source)
KeyStore keystore = KeyStore.getInstance("PKCS12", "BC");
keystore.load (new FileInputStream(PATH+"//test.p12"), "testpassword".toCharArray());
PrivateKey privateKey = (PrivateKey)keystore.getKey("testclientcert", "testpassword".toCharArray());

PEMReader pemReader = new PEMReader(new FileReader(filename));
ContentInfo object = (ContentInfo)pemReader.readObject();

CMSEnvelopedDataParser envDataParser = new CMSEnvelopedDataParser(object.getEncoded());
RecipientInformationStore recipients = envDataParser.getRecipientInfos();
Collection envCollection = recipients.getRecipients();
Iterator it = envCollection.iterator();
RecipientInformation recipient = (RecipientInformation) it.next();
byte[] result = recipient.getContent(privateKey, "BC");
String base64Encoded = new String(Base64.encode(result));

System.out.println(base64Encoded);