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   KeyGenerator kg = KeyGenerator.getInstance("AES");
   kg.init(256);
   SecretKey secretKey = kg.generateKey();
   byte[] key = secretKey.getEncoded();
   System.out.println("ok");
  } catch (NoSuchAlgorithmException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
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  1ÅäÖ÷½Ê½:
   ÐÞ¸ÄÅäÖÃÎļþ,\%JDK_HOME%\jre\lib\security\java.securityÖмÓÈë
   security.provider.10=org.bouncycastle.jce.provider.BouncyCastleProvider
   È»ºó°Ñbcprov-ext-jdk16-145.jar·ÅÈë\%JDK_HOME%\jre\lib\extĿ¼ÏÂ
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   java.security.Security
   org.bouncycastle.jce.provider.BouncyCastleProvider
   ½Ó×ÅÔÚ³õʼ»¯¹¤³§,ÃÜÔ¿Éú³ÉÆ÷µÈÒýÇæÀàʱ,²ÉÓÃÈçÏ·½Ê½
   Security.addProvider(new BouncyCastleProvider())
   »òÕßÔÚ³õʼ»¯¹¤³§,ÃÜÔ¿Éú³ÉÆ÷µÈÒýÇæÀàʱ,²ÉÓÃÈçÏ·½Ê½
   MessageDigest md = MessageDigest.getInstance("MD4","BC");
 
  


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