All files / src/utils CryptUtils.ts

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
1x
1x
 
1x
 
 
 
 
 
141x
 
141x
 
141x
1612x
 
 
141x
 
 
 
 
4928x
 
4928x
 
 
 
4928x
 
 
141x
 
 
 
 
 
 
 
 
 
5x
 
 
5x
5x
5x
5x
 
5x
398x
192x
 
206x
 
 
 
5x
 
 
5x
 
 
 
 
5x
 
 
 
5x
 
5x
5x
 
5x
 
 
 
 
 
 
 
 
 
 
 
 
 
138x
138x
138x
138x
 
138x
35328x
 
 
138x
35328x
35328x
35328x
35328x
 
 
138x
138x
 
138x
715x
715x
715x
715x
715x
715x
 
 
138x
 
 
 
 
import { RandomGeneratorUtils } from './RandomGeneratorUtils';
import { Utils } from './Utils';
 
export class CryptUtils {
    /**
     * @param string
     */
    /* tslint:disable */
    public static btoa (string: string): string {
        const chars: string = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
 
        let output: string = '';
 
        string = encodeURIComponent(string).replace(/%([0-9A-F]{2})/g, (match, p1) => {
            return String.fromCharCode(parseInt(`${Utils.hexadecimalPrefix}${p1}`));
        });
 
        for (
            let block: number|undefined, charCode: number, idx: number = 0, map: string = chars;
            string.charAt(idx | 0) || (map = '=', idx % 1);
            output += map.charAt(63 & block >> 8 - idx % 1 * 8)
        ) {
            charCode = string.charCodeAt(idx += 3/4);
 
            Iif (charCode > 0xFF) {
                throw new Error("'btoa' failed: The string to be encoded contains characters outside of the Latin1 range.");
            }
 
            block = block << 8 | charCode;
        }
 
        return output;
    }
    /* tslint:enable */
 
    /**
     * @param str
     * @param length
     * @returns {string[]}
     */
    public static hideString (str: string, length: number): [string, string] {
        const escapeRegExp: (s: string) => string = (s: string) =>
            s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
 
        const randomMerge: (s1: string, s2: string) => string = function (s1: string, s2: string): string {
            let i1: number = -1,
                i2: number = -1,
                result: string = '';
 
            while (i1 < s1.length || i2 < s2.length) {
                if (RandomGeneratorUtils.getMathRandom() < 0.5 && i2 < s2.length) {
                    result += s2.charAt(++i2);
                } else {
                    result += s1.charAt(++i1);
                }
            }
 
            return result;
        };
 
        const randomString: string = RandomGeneratorUtils.getRandomGenerator().string({
            length: length,
            pool: RandomGeneratorUtils.randomGeneratorPool
        });
 
        let randomStringDiff: string = randomString.replace(
            new RegExp('[' + escapeRegExp(str) + ']', 'g'),
            '');
 
        const randomStringDiffArray: string[] = randomStringDiff.split('');
 
        RandomGeneratorUtils.getRandomGenerator().shuffle(randomStringDiffArray);
        randomStringDiff = randomStringDiffArray.join('');
 
        return [randomMerge(str, randomStringDiff), randomStringDiff];
 
    }
 
    /**
     * RC4 symmetric cipher encryption/decryption
     * https://gist.github.com/farhadi/2185197
     *
     * @param key
     * @param string
     * @returns {string}
     */
    /* tslint:disable */
    public static rc4 (string: string, key: string): string {
        let s: number[] = [],
            j: number = 0,
            x: number,
            result: string = '';
 
        for (var i = 0; i < 256; i++) {
            s[i] = i;
        }
 
        for (i = 0; i < 256; i++) {
            j = (j + s[i] + key.charCodeAt(i % key.length)) % 256;
            x = s[i];
            s[i] = s[j];
            s[j] = x;
        }
 
        i = 0;
        j = 0;
 
        for (let y = 0; y < string.length; y++) {
            i = (i + 1) % 256;
            j = (j + s[i]) % 256;
            x = s[i];
            s[i] = s[j];
            s[j] = x;
            result += String.fromCharCode(string.charCodeAt(y) ^ s[(s[i] + s[j]) % 256]);
        }
 
        return result;
    }
    /* tslint:enable */
}