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                <java-home>/lib/security            [Unix]
                <java-home>\lib\security           [Win32]
      ¸²¸ÇÔ­ÏȵÄjarÎļþ£¬ÇëÏȱ¸·ÝÔ­ÏȵÄjarÎļþ£¬ÒÔ·ÀÄãÐèÒª»Ö¸´ÃÜÔ¿³¤¶ÈµÄÏÞÖÆ£¬ÕâÀïÐèҪעÒâµÄÊÇÈç¹ûÊǰ²×°µÄjdk£¬jdkĿ¼ÖеÄjreÏÂÃæµÄlib\securityϵÄÎļþÒ²ÐèÒª¸²¸Ç¡£Íê³ÉÕâ¸ö²½ÖèÖ®ºó¾Í¿ÉÒÔʹÓò»ÏÞÖÆÃÜÔ¿³¤¶ÈµÄaesËã·¨ÁË£¬¼òµ¥µÄʵÏÖ´úÂëÈçÏ£º
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                kgen.init(192); // 192 and 256 bits also available£¬ÕâÒ»²½ÊÇ·ñÓа²×°jce unlimited strength jurisdiction policy files ¶¼²»»á³öÏÖÒì³£
                Generate the secret key specs.
                SecretKey skey = kgen.generateKey();
                byte[] raw = skey.getEncoded();
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