如何获取公钥？

-5

我试图从下面获取公钥，但我无法检索。如何获取公钥？

我正在使用以下代码。

CertificateFactory certFactory = CertificateFactory.getInstance(CERTIFICATE_TYPE, JCE_PROVIDER); 

      fileInputStream = new FileInputStream(new File(publicKeyFileName)); 
      X509Certificate cert = (X509Certificate) certFactory.generateCertificate(fileInputStream); 
      publicKey = cert.getPublicKey(); 
      certExpiryDate = cert.getNotAfter();

但是，这只能工作，如果我提供证书作为somename.cer文件。

来源

2013-11-23 sufala

哪里是你的代码测试？你面临哪个例外？ –

你试过什么样的努力才会让我看到？并在提出问题之前明确绝对 – Raj

我刚刚下载证书，并在我的本地

import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.security.PublicKey; 
import java.security.cert.CertificateException; 
import java.security.cert.CertificateFactory; 
import java.security.cert.X509Certificate; 

public static void main(String[] args) throws FileNotFoundException, CertificateException { 
     FileInputStream fin = new FileInputStream("C://Users/admin/Desktop/uidai_auth_stage.cer"); 
     CertificateFactory f = CertificateFactory.getInstance("X.509"); 
     X509Certificate certificate = (X509Certificate)f.generateCertificate(fin); 
     PublicKey pk = certificate.getPublicKey(); 
     System.out.println(pk); 
    }

输出

Sun RSA public key, 2048 bits 
    modulus:269965513442232418015450789090428409276489545406694488823092308675874342532769927581914928367201662168201179961444037956523723476457691797490148453388604630304483861894406799761861931859139814624419421952118624143676117705606807289725313505871679662196624284199277807296317727434572557780473195825103383647653402128556252829571054599064686396724089686056490117328555759648852424450610766660552196304214260431235894942706902606159465251944070268033712979539561 
    public exponent: 65537

来源

2013-11-23 09:22:59

+1，并回答OP坦率地不应该回答的问题。 – christopher

@Chris谢谢Chris，我猜OP没有找到一个开始。但他必须是:) –

如何获取公钥？

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