JAVA RSA-DerInputStream.getLength(): lengthTag=127, too big.

最新推荐文章于 2023-12-09 16:39:12 发布

最新推荐文章于 2023-12-09 16:39:12 发布 · 1.3w 阅读

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#java #rsa #DerInputStream.getLength(): lengthTag=127

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本文介绍了一种在使用Java进行RSA公钥加载时遇到的异常情况：InvalidKeyException，并给出了具体的解决办法。通过去除公钥文件中的BEGIN和END标记行，修改了公钥加载方法，成功解决了问题。

RSA 加载公钥时：[color=red]Caused by: java.security.InvalidKeyException: IOException: DerInputStream.getLength(): lengthTag=127, too big.[/color]
加载公钥代码段：


 public static String getPubKeyByCer(String cerPath)
  {
    String pubKey = "";
    try {
      CertificateFactory certificateFactory =      CertificateFactory.getInstance("X.509");
      FileInputStream in = new FileInputStream(cerPath);
      Certificate certificate = certificateFactory.generateCertificate(in);
      in.close();
      PublicKey publicKey = certificate.getPublicKey();
      pubKey = Base64Utils.encode(publicKey.getEncoded());
    } catch (CertificateException e) {
      e.printStackTrace();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } catch (Exception e) {
    	e.printStackTrace();
	}
    return pubKey;
  }

解决办法：[color=red]加载错误-->去掉文件中的首尾行BEGIN,END[/color]
加载方法改为：


  public static String loadPublicKeyByFile(String path) throws Exception {  
      try {  
          BufferedReader br = new BufferedReader(new FileReader(path));  
          String readLine = null;  
          StringBuilder sb = new StringBuilder();  
          while ((readLine = br.readLine()) != null) {  
              sb.append(readLine);  
          }  
          br.close();  
          return sb.toString();  
      } catch (IOException e) {  
          throw new Exception("公钥数据流读取错误");  
      } catch (NullPointerException e) {  
          throw new Exception("公钥输入流为空");  
      }  
  }