JavaScript implementiert den gesamten Prozess der Entschlüsselung und Verschlüsselung. Javascript-Fähigkeiten

Code kopieren Der Code lautet wie folgt:

//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 = neues 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, 0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x 800,0x200002);
var spfunction8 = neues Array (0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0 x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000 , 0x40040,0x10040040,0x10041000,0x1040,0,0 x 10040040,0x100000,0x10001000,0x4. 0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000 , 0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x100400,0x10001000,0x10001040,0,0x1004104040 x 41000,0 x 10404040404040404040404040.

//erstelle die 16 oder 48 Unterschlüssel, die wir benötigen
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;
//Schleifen für Einzel- und Dreifach-Des einrichten
var iterations =keys.length == 32 ? 3 : 9; //einzelnes oder dreifaches des
if (iterations == 3) {looping = encrypt ? neues Array (0, 32, 2): neues Array (30, -2, -2);}
else {looping = encrypt ? neues Array (0, 32, 2, 62, 30, -2, 64, 96, 2) : neues Array (94, 62, -2, 32, 64, 2, 30, -2, -2);}

//die Nachricht abhängig vom Füllparameter auffüllen
if (padding == 2) message = " "; //Fülle die Nachricht mit Leerzeichen auf
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 padding
else if (!padding) message = " "; //Fülle die Nachricht mit Nullbytes auf

//speichere das Ergebnis hier
result = "";
tempresult = "";

if (mode == 1) { //CBC-Modus
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;
}

//Schleife durch jeden 64-Bit-Block der Nachricht
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 );

//für den Cipher Block Chaining-Modus xor die Nachricht mit dem vorherigen Ergebnis
if (mode == 1) {if (encrypt) {left ^= cbcleft; rechts ^= cbcright;} sonst {cbcleft2 = cbcleft; cbcright2 = cbcright; cbcleft = links; cbcright = richtig;}}

//zuerst alle 64, aber ein Teil der Nachricht muss gemäß IP permutiert werden
temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; rechts ^= temp; links ^= (temp << 4);
temp = ((left >>> 16) ^ right) & 0x0000ffff; rechts ^= temp; links ^= (temp << 16);
temp = ((right >>> 2) ^ left) & 0x33333333; links ^= temp; rechts ^= (temp << 2);
temp = ((rechts >>> 8) ^ links) & 0x00ff00ff; links ^= temp; rechts ^= (temp << 8);
temp = ((left >>> 1) ^ right) & 0x55555555; rechts ^= temp; links ^= (temp << 1);

left = ((left << 1) | (left >>> 31));
right = ((right << 1) | (right >>> 31));

//dies entweder 1 oder 3 Mal für jeden Teil der Nachricht tun
for (j=0; jendloop = looping[j 1];
loopinc = Schleife[j 2];
//Jetzt gehen Sie durch und führen Sie die Verschlüsselung oder Entschlüsselung durch
for (i=looping[j]; i!=endloop; i =loopinc) { //für Effizienz
right1 = right ^ keys[i ];
right2 = ((right >>> 4) | (right << 28)) ^ keys[i 1];
//das Ergebnis wird erreicht, indem diese Bytes durch die S-Auswahlfunktionen geleitet werden
temp = left;
links = rechts;
right = temp ^ (spfunction2[(right1 >>> 24) & 0x3f] | spfunction4[(right1 >>> 16) & 0x3f]
| spfunction6[(right1 >> ;> 8) & 0x3f] |. spfunction8[right1 & 0x3f]
|.
|. spfunction5[(right2 >>> 8) & 0x3f] |.
}
temp = left; links = rechts; rechts = temp; //Links und Rechts umkehren
} //für entweder 1 oder 3 Iterationen

//dann jeweils um ein Bit nach rechts verschieben
left = ((left >>> 1) |. (links << 31));
right = ((right >>> 1) | (right << 31));

//Führen Sie jetzt IP-1 aus, was IP in die entgegengesetzte Richtung ist
temp = ((left >>> 1) ^ right) & 0x55555555; rechts ^= temp; links ^= (temp << 1);
temp = ((rechts >>> 8) ^ links) & 0x00ff00ff; links ^= temp; rechts ^= (temp << 8);
temp = ((right >>> 2) ^ left) & 0x33333333; links ^= temp; rechts ^= (temp << 2);
temp = ((left >>> 16) ^ right) & 0x0000ffff; rechts ^= temp; links ^= (temp << 16);
temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; rechts ^= temp; links ^= (temp << 4);

//für den Cipher Block Chaining-Modus xor die Nachricht mit dem vorherigen Ergebnis
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), (links & 0xff), (rechts>>>24), ((rechts>>>16) & 0xff), ((rechts>>>8) & 0xff), (rechts & 0xff));

chunk = 8;
if (chunk == 512) {result = tempresult; tempresult = ""; chunk = 0;}
} //für alle 8 Zeichen oder 64 Bits in der Nachricht

//das Ergebnis als Array zurückgeben
return result tempresult;
}//Ende von des



//des_createKeys
//dies nimmt als Eingabe einen 64-Bit-Schlüssel (obwohl nur 56 Bit verwendet werden)
//als Array von 2 Ganzzahlen und gibt 16 48-Bit-Schlüssel zurück
function des_createKeys (key) {
//die lokale Deklaration beschleunigt die Sache ein wenig
pc2bytes0 = new Array (0,0x4,0x20000000,0x20000004,0x10000, 0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
pc2bytes1 = neues Array (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100, 0x4000101,0x4100100,0x4100101);
pc2bytes2 = neues Array x1000808);
pc2bytes3 = neues Array (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000, 0x22000,0x222000,0x8022000,0x8222000);
pc2bytes4 = neues Array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
pc2bytes5 = neues Array ,0x2000420);
pc2bytes6 = neues Array (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x1 0000002,0x80002,0x10080002);
pc2bytes7 = neues Array (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20 020000,0x20030000,0x20020800,0x20030800);
pc2bytes8 = neues Array (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002, 0x2000002,0x2040002);
pc2bytes9 = neues Array (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x1000040 0,0x408,0x10000408);
pc2bytes10 = neues Array x102020);
pc2bytes11 = neues Array (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x50002 00,0x4200000,0x5200000,0x4200200,0x5200200);
pc2bytes12 = neues Array (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010 ,0x81010,0x8080010,0x8081010);
pc2bytes13 = neues Array (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);

//wie viele Iterationen (1 für des, 3 für dreifache des)
var iterations = key.length > 8 ? 3 : 1; //von Paul am 16.06.2007 geändert, um Triple DES für 9-Byte-Schlüssel zu verwenden
//speichert die Rückgabeschlüssel
var keys = new Array (32 * Iterationen);
//definieren Sie nun die Linksverschiebungen, die durchgeführt werden müssen
var shifts = new Array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);
//andere Variablen
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 = ((left >>> 4) ^ right) & 0x0f0f0f0f; rechts ^= temp; links ^= (temp << 4);
temp = ((rechts >>> -16) ^ links) & 0x0000ffff; links ^= temp; rechts ^= (temp << -16);
temp = ((left >>> 2) ^ right) & 0x33333333; rechts ^= temp; links ^= (temp << 2);
temp = ((rechts >>> -16) ^ links) & 0x0000ffff; links ^= temp; rechts ^= (temp << -16);
temp = ((left >>> 1) ^ right) & 0x55555555; rechts ^= temp; links ^= (temp << 1);
temp = ((rechts >>> 8) ^ links) & 0x00ff00ff; links ^= temp; rechts ^= (temp << 8);
temp = ((left >>> 1) ^ right) & 0x55555555; rechts ^= temp; links ^= (temp << 1);

//die rechte Seite muss verschoben werden und um die letzten vier Bits der linken Seite zu erhalten
temp = (left << 8) | ((right >>> 20) & 0x000000f0);
//left muss auf den Kopf gestellt werden
left = (right << 24) | ((rechts << 8) & 0xff0000) | ((rechts >>> 8) & 0xff00) | ((right >>> 24) & 0xf0);
rechts = temp;

//Jetzt gehen Sie durch und führen Sie diese Verschiebungen auf der linken und rechten Taste durch
for (var i=0; i < shifts.length; i ) {
//verschieben Sie die Tasten entweder ein oder zwei Bits nach links
if (shifts[i]) {left = (left << 2) | (links >>> 26); rechts = (rechts << 2) | (rechts >>> 26);}
else {left = (left << 1) | (links >>> 27); rechts = (rechts << 1) | (rechts >>> 27);}
links &= -0xf; rechts &= -0xf;

//wende jetzt PC-2 an, so dass E beim Verschlüsseln oder Entschlüsseln einfacher ist.
//Diese Konvertierung wird wie PC-2 aussehen, außer dass nur die letzten 6 Bits jedes Bytes verwendet werden
//statt 48 aufeinanderfolgenden Bits und die Reihenfolge der Zeilen richtet sich nach
//wie die S-Auswahlfunktionen angewendet werden: 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);
}
} //für jede Iteration
//die von uns erstellten Schlüssel zurückgeben
Return Keys;
} //Ende des_createKeys



//////////////////////////// / TEST ////////////////////////////
function stringToHex (s) {
var r = "0x" ;
var hexes = neues 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 = "das ist ein 24-Byte-Schlüssel!!";
var message = „Dies ist eine Testnachricht“;
var ciphertext = des (key, message, 1, 0);
document.writeln ("DES Test: " stringToHex (ciphertext));