JavaScript は復号化と暗号化のプロセス全体を実装します_javascript スキル

//Paul Tero, July 2001
//http://www.tero.co.uk/des/
//
//Optimised for performance with large blocks by Michael Hayworth, November 2001
//http://www.netdealing.com
//
//THIS SOFTWARE IS PROVIDED "AS IS" AND
//ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
//FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
//DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
//OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
//HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
//LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
//OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
//SUCH DAMAGE.

//des
//this takes the key, the message, and whether to encrypt or decrypt
function des (key, message, encrypt, mode, iv, padding) {
//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 (-0x7fef7fe0,-0x7fff8000,0x8000,0x108020,0x100000,0x20,-0x7fefffe0,-0x7fff7fe0,-0x7fffffe0,-0x7fef7fe0,-0x7fef8000,-0x80000000,-0x7fff8000,0x100000,0x20,-0x7fefffe0,0x108000,0x100020,-0x7fff7fe0,0,-0x80000000,0x8000,0x108020,-0x7ff00000,0x100020,-0x7fffffe0,0,0x108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0x108020,-0x7fefffe0,0x100000,-0x7fff7fe0,-0x7ff00000,-0x7fef8000,0x8000,-0x7ff00000,-0x7fff8000,0x20,-0x7fef7fe0,0x108020,0x20,0x8000,-0x80000000,0x8020,-0x7fef8000,0x100000,-0x7fffffe0,0x100020,-0x7fff7fe0,-0x7fffffe0,0x100020,0x108000,0,-0x7fff8000,0x8020,-0x80000000,-0x7fefffe0,-0x7fef7fe0,0x108000);
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 = 新しい配列 (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, 0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x8 00,0x200002);
var spfunction8 = 新しい配列 (0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x 41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000 ,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1 000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000 ,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040, 0x1040,0x40040,0x10000000,0x10041000);

//必要な 16 または 48 のサブキーを作成します。
var key = des_createKeys (key);
var m=0, i, j, temp, temp2, right1, right2, left, right, ループ;
var cbcleft、cbcleft2、cbcright、cbcright2
var endloop、loopinc;
var len = message.length;
var チャンク = 0;
//シングルおよびトリプルのループを設定します des
var iterations =keys.length == 32 ? 3:9; //シングルまたはトリプル des
if (iterations == 3) {looping = encrypt ?新しい配列 (0, 32, 2) : 新しい配列 (30, -2, -2);}
else {ループ = 暗号化 ?新しい配列 (0, 32, 2, 62, 30, -2, 64, 96, 2) : 新しい配列 (94, 62, -2, 32, 64, 2, 30, -2, -2);}

//パディングパラメータに応じてメッセージをパディングします
if (padding == 2) message = " "; //メッセージをスペースで埋めます
else if (padding == 1) {temp = 8-(len%8); message = String.fromCharCode (temp,temp,temp,temp,temp,temp,temp,temp); if (temp==8) len =8;} //PKCS7 パディング
else if (!padding) message = " "; //メッセージを null バイトで埋め込みます

//結果をここに保存します
result = "";
tempresult = "";

if (mode == 1) { //CBC モード
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;
}

// メッセージの各 64 ビット チャンクをループします
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 );

//暗号ブロック連鎖モードの場合、メッセージと前の結果の XOR
if (mode == 1) {if (encrypt) {left ^= cbcleft; right ^= cbcright;} else {cbcleft2 = cbcleft; cbcright2 = cbcright; cbcleft = 左; cbcright = 右;}}

//最初はそれぞれ 64 ですが、メッセージのチャンクは IP に従って並べ替える必要があります
temp = ((left >>> 4) ^ right) & 0x0f0f0f0f;右 ^= 温度; left ^= (温度 温度 = ((左 >>> 16) ^ 右) & 0x0000ffff;右 ^= 温度; left ^= (温度 温度 = ((右 >>> 2) ^ 左) & 0x33333333;左 ^= 温度; right ^= (温度 温度 = ((右 >>> 8) ^ 左) & 0x00ff00ff;左 ^= 温度; right ^= (温度 temp = ((左 >>> 1) ^ 右) & 0x55555555;右 ^= 温度;左 ^= (温度
left = ((left << 1) | (left >>> 31));
right = ((right << 1) | (right >>> 31));

//これをメッセージのチャンクごとに 1 回または 3 回実行します。
for (j=0; jendloop = looping[j 1];
loopinc = ループ[j 2];
//暗号化または復号化を実行します
for (i=looping[j]; i!=endloop; i =loopinc) { //効率化のため
right1 = right ^ Keys[i ];
right2 = ((right >>> 4) | (right << 28)) ^ キー[i 1];
//結果は、これらのバイトを S 選択関数に渡すことによって取得されます。
temp = left;
左 = 右;
right = temp ^ (spfunction2[(right1 >>> 24) & 0x3f] | spfunction4[(right1 >>> 16) & 0x3f]
| spfunction6[(right1 >>) ;> 8) & 0x3f] | spfunction8[right1 >> 24) & 0x3f] |
| spfunction5[(right2 >>> 8) & 0x3f] |
}
温度 = 左;左 = 右;右 = 温度; //左右の反転を解除します
} //1 回または 3 回の反復

//その後、各 1 ビットを右に移動します
left = ((left >>> 1) | (左 right = ((right >>> 1) | (right << 31));

//今度は、逆方向の IP である IP-1 を実行します。
temp = ((left >>> 1) ^ right) & 0x55555555;右 ^= 温度;左 ^= (温度 温度 = ((右 >>> 8) ^ 左) & 0x00ff00ff;左 ^= 温度; right ^= (温度 温度 = ((右 >>> 2) ^ 左) & 0x33333333;左 ^= 温度; right ^= (温度 温度 = ((左 >>> 16) ^ 右) & 0x0000ffff;右 ^= 温度; left ^= (温度 temp = ((左 >>> 4) ^ 右) & 0x0f0f0f0f;右 ^= 温度; left ^= (温度
//暗号ブロック連鎖モードの場合、メッセージと前の結果の XOR
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)、(左 & 0xff)、(右>>>24)、((右>>>16) & 0xff)、((右>>>8) & 0xff)、(右) & 0xff));

チャンク = 8;
if (チャンク == 512) {結果 = tempresult; tempresult = ""; chunk = 0;}
} //メッセージ内の 8 文字ごと、または 64 ビットごと

//結果を配列として返します
return result tempresult;
}// des の終わり



//des_createKeys
//これは 64 ビット キーを入力として受け取ります (56 ビットのみが使用されている場合でも)
// 配列として2 つの整数で構成され、16 個の 48 ビット キーを返します。
function des_createKeys (key) {
//これをローカルで宣言すると、処理が少し高速化します。
pc2bytes0 = new Array (0,0x4,0x20000000,0x20000004,0x10000, 0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
pc2bytes1 = 新しい配列 (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0 x4000101,0x4100100,0x4100101);
pc2bytes2 = 新しい配列 (0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0 x1000808);
pc2bytes3 = 新しい配列 (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0 x22000,0x222000,0x8022000,0x8222000);
pc2bytes4 = new Array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
pc2bytes5 = 新しい配列 (0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020 ,0x2000420);
pc2bytes6 = 新しい配列 (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x1) 0000002,0x80002,0x10080002);
pc2bytes7 = 新しい配列 (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x200 20000,0x20030000,0x20020800,0x20030800);
pc2bytes8 = 新しい配列 (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0 x2000002,0x2040002);
pc2bytes9 = 新しい配列 (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x1000040 0,0x408,0x10000408);
pc2bytes10 = 新しい配列 (0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0 x102020);
pc2bytes11 = 新しい配列 (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x500020 0,0x4200000,0x5200000,0x4200200,0x5200200);
pc2bytes12 = 新しい配列 (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010, 0x81010,0x8080010,0x8081010);
pc2bytes13 = 新しい配列 (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);

//反復回数 (des の場合は 1、triple des の場合は 3)
var iterations = key.length > 8? 3:1; //2007 年 6 月 16 日、Paul によって 9 バイト キーに Triple DES を使用するように変更されました
//リターン キーを格納します
var key = new Array (32 * iterations);
//次に、実行する必要がある左シフトを定義します。
var shifts = new Array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1、1、0);
//その他の変数
var lefttemp, righttemp, m=0, n=0, temp;

for (var j=0; jleft = (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 = ((左 >>> 4) ^ 右) & 0x0f0f0f0f;右 ^= 温度; left ^= (温度 温度 = ((右 >>> -16) ^ 左) & 0x0000ffff;左 ^= 温度; right ^= (温度 temp = ((左 >>> 2) ^ 右) & 0x33333333;右 ^= 温度; left ^= (温度 温度 = ((右 >>> -16) ^ 左) & 0x0000ffff;左 ^= 温度; right ^= (温度 temp = ((左 >>> 1) ^ 右) & 0x55555555;右 ^= 温度;左 ^= (温度 温度 = ((右 >>> 8) ^ 左) & 0x00ff00ff;左 ^= 温度; right ^= (温度 temp = ((左 >>> 1) ^ 右) & 0x55555555;右 ^= 温度;左 ^= (温度
//右側をシフトして、左側の最後の 4 ビットを取得する必要があります。
temp = (left << 8) | ((右 >>> 20) & 0x000000f0);
//left は上下逆にする必要があります
left = (right << 24) | ((右 << 8) & 0xff0000) | ((右 >>> 8) & 0xff00) | ((右 >>> 24) & 0xf0);
右 = 温度;

//次に、左右のキーでこれらのシフトを実行します。
for (var i=0; i //キーを次のいずれかにシフトします。 1 ビットまたは 2 ビット左に
if (shifts[i]) {left = (left else {left = (left >27);右 = (右 左 &= -0xf;右 &= -0xf;

//ここで、暗号化または復号化するときに E が簡単になるように PC-2 を適用します。
//この変換は、各バイトの最後の 6 ビットのみが使用されることを除いて PC-2 のようになります。
//連続する 48 ビットではなく、行の順序は
に従います。//S 選択関数がどのように適用されるか: S2、S4、S6、S8、S1、S3、S5、S7
lefttemp = pc2bytes0[left >>> 28] | pc2bytes1[(左 >>> 24) & 0xf]
| pc2bytes2[(左>>> 20) & 0xf] | pc2bytes3[(左 >>> 16) & 0xf]
| pc2bytes4[(左>>> 12) & 0xf] | pc2bytes5[(左 >>> 8) & 0xf]
| pc2bytes6[(左>>> 4) & 0xf];
righttemp = pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf]
| pc2bytes9[(右 >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf]
| pc2bytes11[(右 >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf]
| pc2bytes13[(right >>> 4) & 0xf];
temp = ((righttemp >>> 16) ^ lefttemp) & 0x0000ffff;
keys[n ] = lefttemp ^ temp; key[n ] = righttemp ^ (temp }
} //反復ごとに
//作成したキーを返します
return key;
} //des_createKeys の終わり



///////////////////////////// / TEST //////////////////////////////
function stringToHex (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>] 4] hexes [s.charCodeAt(i) & 0xf];}
return r;
}

function hexToString (h) {
var r = "";
for (var i= (h.substr(0, 2)=="0x")?2:0; ireturn r;
}

var key = "これは 24 バイトのキーです !!";
var message = "これはテストメッセージです";
var ciphertext = des (キー, メッセージ, 1, 0);
document.writeln ("DES テスト: " stringToHex (暗号文));