首先我們來假設一個情況。
我們要做一個flash，裡面存了一段話，只想給知道密碼的人看。通常的做法是檢測用戶的輸入是否等於密碼，然後顯示。但是由於Flash是開放結構，所以swf文件可以反彙編然後看到密碼，這時候就可以非法的看到要保護的東西了。
但是如果通過一個不可逆的算法把密碼加密，然後存在swf裡面。然後把用戶輸入的密碼也同樣加密，然後比對加密以後的字串是否相等就可以了。因為swf裡面保存的密碼是不可逆的嘛~~
不可逆的加密算法有很多種，最流行的就是md系列了，現在的是md5。md5可以計算認可字串的特徵，然後歸結到一個32字節長的字串裡面，源字串一點點的改動就會造成特稱字串巨大的變化。
據個例子：
"abc"的md5是900150983cd24fb0d6963f7d28e17f72
"abb"的md5是ea01e5fd8e4d8832825acdd20eac5104
為什麼說不可逆呢？
據個例子
問題:1000是由什麼數字相加而成的呢？
答案是不知道~
如果說是兩個數字，那麼我們可以有1+999或者500+500或者……但是三個、四個、直到n個數字呢？也就是說我們不可能知道原來的數字是什麼，猜中的機會很小。而md5也是同樣的原理，將每個字符的特徵值相加再相加，自然就很難猜到原來是什麼東西了~
那麼我們有了密碼檢測了~著時候需要一個可逆的加密算法來處理我們要保存的東西，因為要還原嘛~~這類算法很多，我選擇了較流行的des算法
des函數的定義是這樣的
des ("密碼", "加密文本", 模式)
模式=1的時候，des返回加密後的值
模式=0的時候，des返回解密後的值
但是由於des返回的值不一定是通用字符集裡面的，所以我就做了一點處理，將des的值轉成16進制字串，防止錯誤的產生。
道理很明白了，怎麼用呢~~首先，我們來創建密碼的md5值，使用下面的函數：
[color=#6495ED[B]]/*E-mail: tsxy@21cn.comMoon.Blue*/var hexcase = 0;var b64pad = "";var strsize = 8; function md5(s){ return binl2hex(core_md5(str2binl(s), s.length * strsize));}function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * strsize));}function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * strsize));}function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }function core_md5(x, len){ x[len >> 5] |= 0x80 << ((len) % 32); x[(((len + 64) >>> 9) << 4) + 14] = len; var a = 1732584193; var b = -271733879; var c = -1732584194; var d = 271733878; for(var i = 0; i < x.length; i += 16) { var olda = a; var oldb = b; var oldc = c; var oldd = d; a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936); d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586); c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819); b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330); a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897); d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426); c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341); b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983); a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416); d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417); c = md5_ff(c, d, a, b, x[i+10], 17, -42063); b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162); a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682); d = md5_ff(d, a, b, c, x[i+13], 12, -40341101); c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290); b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329); a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510); d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632); c = md5_gg(c, d, a, b, x[i+11], 14, 643717713); b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302); a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691); d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083); c = md5_gg(c, d, a, b, x[i+15], 14, -660478335); b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848); a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438); d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690); c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961); b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501); a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467); d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784); c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473); b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734); a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558); d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463); c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562); b = md5_hh(b, c, d, a, x[i+14], 23, -35309556); a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060); d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353); c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632); b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640); a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174); d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222); c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979); b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189); a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487); d = md5_hh(d, a, b, c, x[i+12], 11, -421815835); c = md5_hh(c, d, a, b, x[i+15], 16, 530742520); b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651); a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844); d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415); c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905); b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055); a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571); d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606); c = md5_ii(c, d, a, b, x[i+10], 15, -1051523); b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799); a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359); d = md5_ii(d, a, b, c, x[i+15], 10, -30611744); c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380); b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649); a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070); d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379); c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259); b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551); a = safe_add(a, olda); b = safe_add(b, oldb); c = safe_add(c, oldc); d = safe_add(d, oldd); } return Array(a, b, c, d);}function md5_cmn(q, a, b, x, s, t){ return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);}function md5_ff(a, b, c, d, x, s, t){ return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);}function md5_gg(a, b, c, d, x, s, t){ return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);}function md5_hh(a, b, c, d, x, s, t){ return md5_cmn(b ^ c ^ d, a, b, x, s, t);}function md5_ii(a, b, c, d, x, s, t){ return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);}function core_hmac_md5(key, data){ var bkey = str2binl(key); if(bkey.length > 16) bkey = core_md5(bkey, key.length * strsize); var ipad = Array(16), opad = Array(16); for(var i = 0; i < 16; i++) { ipad[i] = bkey[i] ^ 0x36363636; opad[i] = bkey[i] ^ 0x5C5C5C5C; } var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * strsize); return core_md5(opad.concat(hash), 512 + 128);}function safe_add(x, y){ var lsw = (x & 0xFFFF) + (y & 0xFFFF); var msw = (x >> 16) + (y >> 16) + (lsw >> 16); return (msw << 16) | (lsw & 0xFFFF);}function bit_rol(num, cnt){ return (num << cnt) | (num >>> (32 - cnt));}function str2binl(str){ var bin = Array(); var mask = (1 << strsize) - 1; for(var i = 0; i < str.length * strsize; i += strsize) bin[i>>5] |= (str.charCodeAt(i / strsize) & mask) << (i%32); return bin;}function binl2str(bin){ var str = ""; var mask = (1 << strsize) - 1; for(var i = 0; i < bin.length * 32; i += strsize) str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask); return str;}function binl2hex(binarray){ var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"; var str = ""; for(var i = 0; i < binarray.length * 4; i++){ str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) + hex_tab.charAt((binarray[i>>2] >> ((i%4)*8 )) & 0xF); } return str;}function binl2b64(binarray){ var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; var str = ""; for(var i = 0; i < binarray.length * 4; i += 3){ var triplet = (((binarray[i >> 2] >> 8 * ( i %4)) & 0xFF) << 16) | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 ) | ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF); for(var j = 0; j < 4; j++){ if(i * 8 + j * 6 > binarray.length * 32) str += b64pad; else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F); } } return str;}trace(md5("abb"));[/B][/color]
將這個程序放到flash的第一幀，這裡的abb應該換成你的密碼，然後運行。把顯示出來的字串複製下來，然後去掉trace那一行。
加入passd="剛才複製的字串";
這時候，再加入另外一段代碼（拷貝代碼的時候請注意有些折行需要更改－－顏色較淡的部分）：
[color=#6495ED][B]function des(key, message, encrypt, mode, iv) { //declaring this locally speeds things up a bit var spfunction1 = new Array(0x1010400, 0, 0x10000, 0x1010404, 0x1010004, 0x10404,
0x4, 0x10000, 0x400, 0x1010400, 0x1010404, 0x400, 0x1000404, 0x1010004, 0x1000000, 0x4,
0x404, 0x1000400, 0x1000400, 0x10400, 0x10400, 0x1010000, 0x1010000, 0x1000404, 0x10004,
0x1000004, 0x1000004, 0x10004, 0, 0x404, 0x10404, 0x1000000, 0x10000, 0x1010404, 0x4,
0x1010000, 0x1010400, 0x1000000, 0x1000000, 0x400, 0x1010004, 0x10000, 0x10400, 0x1000004,
0x400, 0x4, 0x1000404, 0x10404, 0x1010404, 0x10004, 0x1010000, 0x1000404, 0x1000004, 0x404,
0x10404, 0x1010400, 0x404, 0x1000400, 0x1000400, 0, 0x10004, 0x10400, 0, 0x1010004); var spfunction2 = new Array(0x80108020, 0x80008000, 0x8000, 0x108020, 0x100000,
0x20, 0x80100020, 0x80008020, 0x80000020, 0x80108020, 0x80108000, 0x80000000, 0x80008000,
0x100000, 0x20, 0x80100020, 0x108000, 0x100020, 0x80008020, 0, 0x80000000, 0x8000, 0x108020,
0x80100000, 0x100020, 0x80000020, 0, 0x108000, 0x8020, 0x80108000, 0x80100000, 0x8020, 0,
0x108020, 0x80100020, 0x100000, 0x80008020, 0x80100000, 0x80108000, 0x8000, 0x80100000,
0x80008000, 0x20, 0x80108020, 0x108020, 0x20, 0x8000, 0x80000000, 0x8020, 0x80108000, 0x100000,
0x80000020, 0x100020, 0x80008020, 0x80000020, 0x100020, 0x108000, 0, 0x80008000, 0x8020,
0x80000000, 0x80100020, 0x80108020, 0x108000); var spfunction3 = new Array(0x208, 0x8020200, 0, 0x8020008, 0x8000200, 0, 0x20208,
0x8000200, 0x20008, 0x8000008, 0x8000008, 0x20000, 0x8020208, 0x20008, 0x8020000, 0x208,
0x8000000, 0x8, 0x8020200, 0x200, 0x20200, 0x8020000, 0x8020008, 0x20208, 0x8000208,
0x20200, 0x20000, 0x8000208, 0x8, 0x8020208, 0x200, 0x8000000, 0x8020200, 0x8000000,
0x20008, 0x208, 0x20000, 0x8020200, 0x8000200, 0, 0x200, 0x20008, 0x8020208, 0x8000200,
0x8000008, 0x200, 0, 0x8020008, 0x8000208, 0x20000, 0x8000000, 0x8020208, 0x8, 0x20208,
0x20200, 0x8000008, 0x8020000, 0x8000208, 0x208, 0x8020000, 0x20208, 0x8, 0x8020008, 0x20200); var spfunction4 = new Array(0x802001, 0x2081, 0x2081, 0x80, 0x802080, 0x800081,
0x800001, 0x2001, 0, 0x802000, 0x802000, 0x802081, 0x81, 0, 0x800080, 0x800001, 0x1,
0x2000, 0x800000, 0x802001, 0x80, 0x800000, 0x2001, 0x2080, 0x800081, 0x1, 0x2080,
0x800080, 0x2000, 0x802080, 0x802081, 0x81, 0x800080, 0x800001, 0x802000, 0x802081,
0x81, 0, 0, 0x802000, 0x2080, 0x800080, 0x800081, 0x1, 0x802001, 0x2081, 0x2081, 0x80,
0x802081, 0x81, 0x1, 0x2000, 0x800001, 0x2001, 0x802080, 0x800081, 0x2001, 0x2080, 0x800000,
0x802001, 0x80, 0x800000, 0x2000, 0x802080); var spfunction5 = new Array(0x100, 0x2080100, 0x2080000, 0x42000100, 0x80000, 0x100,
0x40000000, 0x2080000, 0x40080100, 0x80000, 0x2000100, 0x40080100, 0x42000100, 0x42080000,
0x80100, 0x40000000, 0x2000000, 0x40080000, 0x40080000, 0, 0x40000100, 0x42080100, 0x42080100,
0x2000100, 0x42080000, 0x40000100, 0, 0x42000000, 0x2080100, 0x2000000, 0x42000000, 0x80100,
0x80000, 0x42000100, 0x100, 0x2000000, 0x40000000, 0x2080000, 0x42000100, 0x40080100,
0x2000100, 0x40000000, 0x42080000, 0x2080100, 0x40080100, 0x100, 0x2000000, 0x42080000,
0x42080100, 0x80100, 0x42000000, 0x42080100, 0x2080000, 0, 0x40080000, 0x42000000, 0x80100,
0x2000100, 0x40000100, 0x80000, 0, 0x40080000, 0x2080100, 0x40000100); var spfunction6 = new Array(0x20000010, 0x20400000, 0x4000, 0x20404010, 0x20400000, 0x10,
0x20404010, 0x400000, 0x20004000, 0x404010, 0x400000, 0x20000010, 0x400010, 0x20004000,
0x20000000, 0x4010, 0, 0x400010, 0x20004010, 0x4000, 0x404000, 0x20004010, 0x10, 0x20400010,
0x20400010, 0, 0x404010, 0x20404000, 0x4010, 0x404000, 0x20404000, 0x20000000, 0x20004000,
0x10, 0x20400010, 0x404000, 0x20404010, 0x400000, 0x4010, 0x20000010, 0x400000, 0x20004000,
0x20000000, 0x4010, 0x20000010, 0x20404010, 0x404000, 0x20400000, 0x404010, 0x20404000, 0,
0x20400010, 0x10, 0x4000, 0x20400000, 0x404010, 0x4000, 0x400010, 0x20004010, 0, 0x20404000,
0x20000000, 0x400010, 0x20004010); var spfunction7 = new Array(0x200000, 0x4200002, 0x4000802, 0, 0x800, 0x4000802, 0x200802,
0x4200800, 0x4200802, 0x200000, 0, 0x4000002, 0x2, 0x4000000, 0x4200002, 0x802, 0x4000800,
0x200802, 0x200002, 0x4000800, 0x4000002, 0x4200000, 0x4200800, 0x200002, 0x4200000, 0x800,
0x802, 0x4200802, 0x200800, 0x2, 0x4000000, 0x200800, 0x4000000, 0x200800, 0x200000, 0x4000802,
0x4000802, 0x4200002, 0x4200002, 0x2, 0x200002, 0x4000000, 0x4000800, 0x200000, 0x4200800,
0x802, 0x200802, 0x4200800, 0x802, 0x4000002, 0x4200802, 0x4200000, 0x200800, 0, 0x2, 0x4200802,
0, 0x200802, 0x4200000, 0x800, 0x4000002, 0x4000800, 0x800, 0x200002); var spfunction8 = new Array(0x10001040, 0x1000, 0x40000, 0x10041040, 0x10000000,
0x10001040, 0x40, 0x10000000, 0x40040, 0x10040000, 0x10041040, 0x41000, 0x10041000,
0x41040, 0x1000, 0x40, 0x10040000, 0x10000040, 0x10001000, 0x1040, 0x41000, 0x40040,
0x10040040, 0x10041000, 0x1040, 0, 0, 0x10040040, 0x10000040, 0x10001000, 0x41040, 0x40000,
0x41040, 0x40000, 0x10041000, 0x1000, 0x40, 0x10040040, 0x1000, 0x41040, 0x10001000, 0x40,
0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x40000, 0x10001040, 0, 0x10041040, 0x40040,
0x10000040, 0x10040000, 0x10001000, 0x10001040, 0, 0x10041040, 0x41000, 0x41000, 0x1040,
0x1040, 0x40040, 0x10000000, 0x10041000);
//create the 16 or 48 subkeys we will need var keys = des_createKeys(key); var m = 0, i, j, temp, temp2, right1, right2, left, right, looping; var cbcleft, cbcleft2, cbcright, cbcright2; var endloop, loopinc; var len = message.length; var chunk = 0;
//set up the loops for single and triple des var iterations = keys.length == 32 ? 3 : 9;
//single or triple des if (iterations == 3) { looping = encrypt ? new Array(0, 32, 2) : new Array(30, -2, -2); } else { looping = encrypt ? new Array(0, 32, 2, 62, 30, -2, 64, 96, 2) :
new Array(94, 62, -2, 32, 64, 2, 30, -2, -2); } message += "";
//pad the message out with null bytes //store the result here result = ""; tempresult = ""; if (mode == 1) { //CBC mode cbcleft = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16)
| (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++); cbcright = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16)
| (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++); m = 0; }
//loop through each 64 bit chunk of the message while (m<len) { left = (message.charCodeAt(m++) << 24) | (message.charCodeAt(m++) << 16)
| (message.charCodeAt(m++) << 8) | message.charCodeAt(m++); right = (message.charCodeAt(m++) << 24) | (message.charCodeAt(m++) << 16)
| (message.charCodeAt(m++) << 8) | message.charCodeAt(m++); //for Cipher Block Chaining mode, xor the message with the previous result if (mode == 1) { if (encrypt) { left ^= cbcleft; right ^= cbcright; } else { cbcleft2 = cbcleft; cbcright2 = cbcright; cbcleft = left; cbcright = right; } }
//first each 64 but chunk of the message must be permuted according to IP temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4); temp = ((left >>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16); temp = ((right >>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2); temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8); temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); left = ((left << 1) | (left >>> 31)); right = ((right << 1) | (right >>> 31));
//do this either 1 or 3 times for each chunk of the message for (j=0; j<iterations; j += 3) { endloop = looping[j+1]; loopinc = looping[j+2]; //now go through and perform the encryption or decryption for (i=looping[j]; i != endloop; i += loopinc) { //for efficiency right1 = right ^ keys[i]; right2 = ((right >>> 4) | (right << 28)) ^ keys[i+1]; //the result is attained by passing these bytes through the S selection functions temp = left; left = right; right = temp ^ (spfunction2[(right1 >>> 24) & 0x3f] |
spfunction4[(right1 >>> 16) & 0x3f] | spfunction6[(right1 >>> 8) & 0x3f] |
spfunction8[right1 & 0x3f] | spfunction1[(right2 >>> 24) & 0x3f] |
spfunction3[(right2 >>> 16) & 0x3f] | spfunction5[(right2 >>> 8) & 0x3f] |
spfunction7[right2 & 0x3f]); } temp = left; left = right; right = temp; //unreverse left and right }
//for either 1 or 3 iterations //move then each one bit to the right left = ((left >>> 1) | (left << 31)); right = ((right >>> 1) | (right << 31)); //now perform IP-1, which is IP in the opposite direction temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8); temp = ((right >>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2); temp = ((left >>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16); temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4); //for Cipher Block Chaining mode, xor the message with the previous result if (mode == 1) { if (encrypt) { cbcleft = left; cbcright = right; } else { left ^= cbcleft2; right ^= cbcright2; } } tempresult += String.fromCharCode((left >>> 24), ((left >>> 16) & 0xff),
((left >>> 8) & 0xff), (left & 0xff), (right >>> 24), ((right >>> 16) & 0xff),
((right >>> 8) & 0xff), (right & 0xff)); chunk += 8; if (chunk == 512) { result += tempresult; tempresult = ""; chunk = 0; } } //for every 8 characters, or 64 bits in the message //return the result as an array return result+tempresult;}//end of des//des_createKeys//this takes as input a 64 bit key (even though only 56 bits are used)//as an array of 2 integers, and returns 16 48 bit keysfunction des_createKeys(key) { //declaring this locally speeds things up a bit pc2bytes0 = new Array(0, 0x4, 0x20000000, 0x20000004, 0x10000, 0x10004, 0x20010000, 0x20010004,
0x200, 0x204, 0x20000200, 0x20000204, 0x10200, 0x10204, 0x20010200, 0x20010204); pc2bytes1 = new Array(0, 0x1, 0x100000, 0x100001, 0x4000000, 0x4000001, 0x4100000, 0x4100001,
0x100, 0x101, 0x100100, 0x100101, 0x4000100, 0x4000101, 0x4100100, 0x4100101); pc2bytes2 = new Array(0, 0x8, 0x800, 0x808, 0x1000000, 0x1000008, 0x1000800, 0x1000808, 0,
0x8, 0x800, 0x808, 0x1000000, 0x1000008, 0x1000800, 0x1000808); pc2bytes3 = new Array(0, 0x200000, 0x8000000, 0x8200000, 0x2000, 0x202000, 0x8002000, 0x8202000,
0x20000, 0x220000, 0x8020000, 0x8220000, 0x22000, 0x222000, 0x8022000, 0x8222000); pc2bytes4 = new Array(0, 0x40000, 0x10, 0x40010, 0, 0x40000, 0x10, 0x40010, 0x1000, 0x41000,
0x1010, 0x41010, 0x1000, 0x41000, 0x1010, 0x41010); pc2bytes5 = new Array(0, 0x400, 0x20, 0x420, 0, 0x400, 0x20, 0x420, 0x2000000, 0x2000400,
0x2000020, 0x2000420, 0x2000000, 0x2000400, 0x2000020, 0x2000420); pc2bytes6 = new Array(0, 0x10000000, 0x80000, 0x10080000, 0x2, 0x10000002, 0x80002, 0x10080002,
0, 0x10000000, 0x80000, 0x10080000, 0x2, 0x10000002, 0x80002, 0x10080002); pc2bytes7 = new Array(0, 0x10000, 0x800, 0x10800, 0x20000000, 0x20010000, 0x20000800, 0x20010800,
0x20000, 0x30000, 0x20800, 0x30800, 0x20020000, 0x20030000, 0x20020800, 0x20030800); pc2bytes8 = new Array(0, 0x40000, 0, 0x40000, 0x2, 0x40002, 0x2, 0x40002, 0x2000000, 0x2040000,
0x2000000, 0x2040000, 0x2000002, 0x2040002, 0x2000002, 0x2040002); pc2bytes9 = new Array(0, 0x10000000, 0x8, 0x10000008, 0, 0x10000000, 0x8, 0x10000008, 0x400,
0x10000400, 0x408, 0x10000408, 0x400, 0x10000400, 0x408, 0x10000408); pc2bytes10 = new Array(0, 0x20, 0, 0x20, 0x100000, 0x100020, 0x100000, 0x100020, 0x2000, 0x2020,
0x2000, 0x2020, 0x102000, 0x102020, 0x102000, 0x102020); pc2bytes11 = new Array(0, 0x1000000, 0x200, 0x1000200, 0x200000, 0x1200000, 0x200200, 0x1200200,
0x4000000, 0x5000000, 0x4000200, 0x5000200, 0x4200000, 0x5200000, 0x4200200, 0x5200200); pc2bytes12 = new Array(0, 0x1000, 0x8000000, 0x8001000, 0x80000, 0x81000, 0x8080000, 0x8081000,
0x10, 0x1010, 0x8000010, 0x8001010, 0x80010, 0x81010, 0x8080010, 0x8081010); pc2bytes13 = new Array(0, 0x4, 0x100, 0x104, 0, 0x4, 0x100, 0x104, 0x1, 0x5, 0x101, 0x105,
0x1, 0x5, 0x101, 0x105); //how many iterations (1 for des, 3 for triple des) var iterations = key.length>=24 ? 3 : 1; //stores the return keys var keys = new Array(32*iterations); //now define the left shifts which need to be done var shifts = new Array(0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0); //other variables var lefttemp, righttemp, m = 0, n = 0, temp; for (var j = 0; j<iterations; j++) { //either 1 or 3 iterations left = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16)
| (key.charCodeAt(m++) << 8) | key.charCodeAt(m++); right = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16)
| (key.charCodeAt(m++) << 8) | key.charCodeAt(m++); temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4); temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16); temp = ((left >>> 2) ^ right) & 0x33333333; right ^= temp; left ^= (temp << 2); temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16); temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8); temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); //the right side needs to be shifted and to get the last four bits of the left side temp = (left << 8) | ((right >>> 20) & 0x000000f0); //left needs to be put upside down left = (right << 24) | ((right << 8) & 0xff0000) |
((right >>> 8) & 0xff00) | ((right >>> 24) & 0xf0); right = temp; //now go through and perform these shifts on the left and right keys for (i=0; i<shifts.length; i++) { //shift the keys either one or two bits to the left if (shifts[i]) { left = (left << 2) | (left >>> 26); right = (right << 2) | (right >>> 26); } else { left = (left << 1) | (left >>> 27); right = (right << 1) | (right >>> 27); } left &= 0xfffffff0; right &= 0xfffffff0; //now apply PC-2, in such a way that E is easier when encrypting or decrypting //this conversion will look like PC-2 except only the last 6 bits of each byte are used //rather than 48 consecutive bits and the order of lines will be according to //how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7 lefttemp = pc2bytes0[left >>> 28] | pc2bytes1[(left >>> 24) & 0xf] |
pc2bytes2[(left >>> 20) & 0xf] | pc2bytes3[(left >>> 16) & 0xf] | pc2bytes4[(left >>> 12)
& 0xf] | pc2bytes5[(left >>> 8) & 0xf] | pc2bytes6[(left >>> 4) & 0xf]; righttemp = pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf]
| pc2bytes9[(right >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf] |
pc2bytes11[(right >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf] |
pc2bytes13[(right >>> 4) & 0xf]; temp = ((righttemp >>> 16) ^ lefttemp) & 0x0000ffff; keys[n++] = lefttemp ^ temp; keys[n++] = righttemp ^ (temp << 16); } } //for each iterations //return the keys we've created return keys;}//end of des_createKeys////////////////////////////// TEST ////////////////////////////////printHexArrayfunction printHex(s) { var r = "0x"; var hexes = new Array("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"); for (var i = 0; i<s.length; i++) { r += hexes[s.charCodeAt(i) >> 4]+hexes[s.charCodeAt(i) & 0xf]; } return r;}function unHex(s) { var r = ""; for (var i = 2; i<s.length; i += 2) { x1 = s.charCodeAt(i); x1 = x1>=48 && x1<58 ? x1-48 : x1-97+10; x2 = s.charCodeAt(i+1); x2 = x2>=48 && x2<58 ? x2-48 : x2-97+10; r += String.fromCharCode(((x1 << 4) & 0xF0) | (x2 & 0x0F)); } return r;}test=printHex(des ("沒有md5的密碼", "要保護的字串", 1));trace(test);trace(unHex(des ("沒有md5的密碼", test, 0)));[/B][/color]
這時候再運行，然後把顯示出來的字串（0x開頭）copy下來。
然後刪除
test=printHex(des ("沒有md5的密碼", "要保護的字串", 1));
trace(test);
trace(unHex(des ("沒有md5的密碼", test, 0)));
寫入
test="剛才copy的字串";
這時候你的作品就差不多完成了
然後你要做的就是將用戶輸入的密碼讀入，假設你讀入到了input這個變量裡面。那麼程序就應該寫
[color=#6495ED]
if(md5(input)==pass){ trace(unHex(des (pass, test, 0)));}else{
trace("密碼錯誤");}
[/color] 怎麼樣？其實總共要寫得代碼就只有七行~~很簡單吧。
到底有多安全？我只敢說和錢沒有關係就很安全。
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