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   ½âѹzip,
   ÓÃÆäÖеÄÁ½¸öjar°ü¸²¸Çjdk6ÏÂ\%JDK_HOME%\jre\lib\securityĿ¼ÏµÄjar°ü
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try {
   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();
  }
  ¶Ôµ÷ÕûºóµÄϵͳȨÏÞ½øÐÐÑéÖ¤,Ö´ÐÐ˳Àû,±íʾÉúЧ,Èç¹û²»½øÐе÷Õû,ÓÉÓÚ³ö¿ÚÏÞÖÆ,ÃÜÔ¿²»Ö§³Ö256λ.
  MD4,IDEAµÈ¼ÓÃÜËã·¨,java6²»Ö§³Ö,¿ÉÒÔͨ¹ýÔÚJRE»·¾³ÖÐÅäÖÿªÔ´×é¼þ°üBounce Castle,¼ÓÈë¶ÔÓ¦µÄ
  ÌṩÕß,»ñµÃÏàÓ¦µÄËã·¨Ö§³Ö.
  ´Óhttp://www.bouncycastle.org/latest_releases.html
  ÏÂÔØ bcprov-jdk16-145.jar ,bcprov-ext-jdk16-145.jar
  À©³äËã·¨Ö§³ÖµÄÁ½ÖÖ·½Ê½
  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
   jreĿ¼ÏÂÒ²×÷ÏàͬÅäÖÃ
  2µ÷Ó÷½Ê½:
   °Ñbcprov-jdk16-145.jarµ¼È빤³Ì,½Ó×ÅÔÚ³ÌÐòÖÐÒªµ¼ÈëÁ½¸öÀà
   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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