请帮助卡住无效的密钥异常

Question

我得到java.security.InvalidKeyException：非法的密钥大小或默认参数，我已经休整了所有必需的步骤，安装Java加密扩展（JCE）无限强度管辖权限策略文件。 此外，我已经通过这些主题

Java.security.InvalidKeyException: Illegal key size or default parameters error

Java Security: Illegal key size or default parameters?

走了，但我还是被卡住，让java.security.InvalidKeyException：非法密钥大小或默认参数，

下面是我的代码： AESKeyGenerator.java

public class AESKeyGenerator { 

    private Cipher mCipher; 

    public AESKeyGenerator() 
    { 
     // default constructor 
    } 


    public byte[] generate_k(String dhkey, String toEncrypt) 
    { 
     byte[] retVal; 

     try { // Set up the Cipher class of Android to use AES to generate keys 
      byte[] iv = new byte[16]; 
      for (int i = 0; i < iv.length; i++) 
       iv[i] = new Byte("0").byteValue(); 
      IvParameterSpec ivspec = new IvParameterSpec(iv); 
      mCipher = Cipher.getInstance("AES"); 
      // Set up key to use in algorithm 
      MessageDigest hasher = MessageDigest.getInstance("SHA-256"); // Initialize object that will hash my key. 
      byte[] key256 = hasher.digest(dhkey.getBytes()); // Hash the key to 256 bits using SHA 
      SecretKeySpec K = new SecretKeySpec(key256, "AES"); 
      System.out.println("SecretKeySpec : "+K + " key256 "+key256); 
      mCipher.init(Cipher.ENCRYPT_MODE, K, ivspec); 
      // Encrypt the parameter toEncrypt 
      retVal = mCipher.doFinal(toEncrypt.getBytes()); 
      return retVal; 
     } 
     catch (Exception e) { 
         e.printStackTrace(); 
      System.err.println("Could not create and initialize object Cipher."); 
     } 

     return null; 

    } 

    public byte[] generate_r(byte[] sharedKey, String toEncrypt) 
    { 
     byte[] retVal; 
     try { 
      /*byte[] iv = new byte[16]; 
      for (int i = 0; i < iv.length; i++) 
       iv[i] = new Byte("0").byteValue(); 
      IvParameterSpec ivspec = new IvParameterSpec(iv);*/ 

      // Set up the Cipher class of Android to use AES to generate keys 
      mCipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); 
      // Set up key to use in algorithm 
      MessageDigest hasher = MessageDigest.getInstance("SHA-256"); // Initialize object that will hash my key. 
      byte[] key256 = hasher.digest(sharedKey); // Hash the key to 256 bits using SHA 256 
      SecretKeySpec K = new SecretKeySpec(key256, "AES"); 
      mCipher.init(Cipher.ENCRYPT_MODE, K); 
      // Encrypt the parameter toEncrypt 
      System.out.println("toEncrypt AES: "+ toEncrypt); 
      retVal = mCipher.doFinal(toEncrypt.getBytes()); 
      return retVal; 
     } 
     catch (Exception e) { 
         e.printStackTrace(); 
      System.err.println("exception: "+ e.toString()); 
      System.err.println("Could not create and initialize object Cipher."); 
     } 

     return null; 

    } 
} 

我正在休耕错误：

java.security.InvalidKeyException: Illegal key size or default parameters 
    at javax.crypto.Cipher.checkCryptoPerm(Cipher.java:1010) 
    at javax.crypto.Cipher.implInit(Cipher.java:785) 
    at javax.crypto.Cipher.chooseProvider(Cipher.java:848) 
    at javax.crypto.Cipher.init(Cipher.java:1212) 
    at javax.crypto.Cipher.init(Cipher.java:1152) 
    at AESKeyGenerator.generate_r(AESKeyGenerator.java:74) 
    at DetectionServer.storeGridInformation(DetectionServer.java:309) 
    at DetectionServer.doPost(DetectionServer.java:103) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 
exception: java.security.InvalidKeyException: Illegal key size or default parameters 
Could not create and initialize object Cipher. 

我的标准代码，这也是与此相同检查。我认为配置或缺少库存在一些问题。

Answer 1

我不重现此 - 我已经安装了当前Unlimited Strength Jurisdiction Policy Files，我已经使用了以下主要的方法来测试：

public static void main(String[] args) throws UnsupportedEncodingException { 
    AESKeyGenerator aes = new AESKeyGenerator(); 
    String sharedKey = "Bar12345Bar12345Bar12345Bar12345"; 
    aes.generate_r(sharedKey.getBytes("US-ASCII"), "Hello World"); 
} 

在安装之前的政策文件，我得到了同样的异常，因为你。

我首先做错的一件事是我将策略文件安装到了Program files/jdk_1.7.0_13/jre/lib/security，但是使用的JRE位于Program files/jre7--因此请确保您已将策略文件安装在正确的位置并检查一个简单的独立的Java应用程序使用上面的主要方法，如果它工作。

Answer 2

我得到了同样的问题，但现在工作得很好,,你必须去这个网站，并下载http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html 下载（UnlimitedJCEPolicyJDK7.zip），然后解压缩和两个jar文件复制到你的JDK位置路径，然后重新启动项目。就是它