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DES.js
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DES.js
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function permutation(a, per) {
var b = [];
for (let i = 0; i < per.length; i++) b.push(a[per[i]]);
return b;
}
function XOR(a, b) {
if (a.length != b.length) {
throw 'The lengths of two arrays are not identical!';
}
var c = [];
for (let i = 0; i < a.length; i++) c.push(a[i]^b[i]);
return c;
}
function bin(x, length) {
var a = [];
for (let i = 0; i < length; i++) {
a.unshift(x&1);
x /= 2;
}
return a;
}
function dec(a) {
var x = 0;
for (let i = 0; i < a.length; i++) x = x*2 + a[i];
return x;
}
const trans = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"];
function hex(a) {
var x = "";
for (let i = 0; i < a.length; i+=4) {
var y = 8*a[i] + 4*a[i+1] + 2*a[i+2] + a[i+3];
x = x + trans[y];
}
return '0x' + x;
}
const IP = [57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7,
56, 48, 40, 32, 24, 16, 8, 0, 58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6];
const inv_IP = [39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25, 32, 0, 40, 8, 48, 16, 56, 24];
const SBox = [
[[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7],
[0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8],
[4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0],
[15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13]],
[[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10],
[3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5],
[0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15],
[13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9]],
[[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8],
[13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1],
[13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7],
[1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12]],
[[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15],
[13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9],
[10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4],
[3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]],
[[2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9],
[14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6],
[4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14],
[11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]],
[[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11],
[10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8],
[9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6],
[4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]],
[[4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1],
[13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6],
[1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2],
[6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]],
[[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7],
[1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2],
[7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8],
[2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]]
];
const E = [31, 0, 1, 2, 3, 4, 3, 4, 5, 6, 7, 8, 7, 8, 9, 10,
11, 12, 11, 12, 13, 14, 15, 16, 15, 16, 17, 18, 19, 20, 19, 20,
21, 22, 23, 24, 23, 24, 25, 26, 27, 28, 27, 28, 29, 30, 31, 0];
const P = [15, 6, 19, 20, 28, 11, 27, 16, 0, 14, 22, 25, 4, 17, 30, 9,
1, 7, 23, 13, 31, 26, 2, 8, 18, 12, 29, 5, 21, 10, 3, 24];
const IPC = [56,48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, 9, 1,
58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 62, 54, 46, 38,
30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 60, 52, 44, 36,
28, 20, 12, 4, 27, 19, 11, 3];
const PC = [13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, 22, 18, 11, 3,
25, 7, 15, 6, 26, 19, 12, 1, 40, 51, 30, 36, 46, 54, 29, 39,
50, 44, 32, 47, 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31];
const LS = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1];
function shift_left(a, shift) {
if (shift > a.length) {
throw 'Shift bits is more than original length!';
}
var b = [];
for (let i = shift; i < a.length; i++) b.push(a[i]);
for (let i = 0; i < shift; i++) b.push(a[i]);
return b;
}
const iter = 8;
function key_generator(key) {
if (key.length != 64) {
throw 'Key length is not equal to 64!';
}
keys = [];
key = permutation(key, IPC);
for (let i = 0; i < iter; i++) {
key = shift_left(key.slice(0, 28), LS[i]).concat(shift_left(key.slice(28, 56), LS[i]));
keys.push(permutation(key, PC));
}
return keys;
}
function F(a, key) {
a = permutation(a, E);
a = XOR(a, key);
var b = [];
for (let i = 0; i < 8; i++) {
var c = a.slice(i*6, (i+1)*6);
b = b.concat(bin(SBox[i][dec([c[0],c[5]])][dec([c[1],c[2],c[3],c[4]])], 4));
}
b = permutation(b, P);
return b;
}
function DES(a, keys) {
a = permutation(a, IP);
var L = a.slice(0, 32);
var R = a.slice(32, 64);
for (let i = 0; i < iter; i++) {
var new_L = R;
var new_R = XOR(L, F(R, keys[i]));
L = new_L;
R = new_R;
}
var b = R.concat(L);
b = permutation(b, inv_IP);
return b;
}
/*
// Test DES
var plaintext = bin(123, 64), key = bin(123, 64);
console.log(hex(key));
keys = key_generator(key);
console.log(hex(plaintext));
var ciphertext = DES(plaintext, keys);
console.log(hex(ciphertext));
plaintext = DES(ciphertext, keys.reverse());
console.log(hex(plaintext));
*/
function CBC(plaintext, IV, keys, is_decode) {
var ciphertext = [];
var lst_cipher = IV;
for (let i = 0; i < plaintext.length; i += 64)
{
if (is_decode)
{
var cur_text = plaintext.slice(i, i + 64);
ciphertext = ciphertext.concat(XOR(DES(cur_text, keys), lst_cipher));
lst_cipher = cur_text;
}
else
{
var cur_text = XOR(plaintext.slice(i, i + 64), lst_cipher);
lst_cipher = DES(cur_text, keys);
ciphertext = ciphertext.concat(lst_cipher);
}
}
return ciphertext;
}
function toarray(str){
var a = new Array();
for(var i = 0; i < str.length; i++)
a[i] = str[i] - '0';
return a;
}
function check(str, name, check_length) {
if (str == "")
{
alert(name + "不能为空!");
return false;
}
for (let i = 0; i < str.length; i++)
if (str[i] != '0' && str[i] != '1')
{
alert(name + "应为01字符串！");
return false;
}
if (check_length && str.length != 64)
{
alert(name + "长度应为64！");
return false;
}
return true;
}