All files / src/crypter AES.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
1x
1x
1x
1x
 
1x
 
 
 
26x
 
 
 
26x
 
 
26x
26x
2x
24x
 
 
 
25x
25x
25x
96x
25x
 
 
 
25x
25x
25x
114x
25x
 
 
 
import { Block } from 'aes-ts';
import { ICrypter } from './ICrypter';
import { CBCMode, type IModeOfOperation } from './modeOfOperation';
import { PKCS7Padding, type IPadding } from './padding';
 
export class AES extends ICrypter {
 
    private readonly blockCrypter: Block;
 
    protected readonly blockSize = 16;
 
    public constructor(
        key: Uint8Array,
        private readonly modeOfOperation: IModeOfOperation = new CBCMode(),
        padding: IPadding = new PKCS7Padding()
    ) {
        super(padding);
        if (key.length !== 16 && key.length !== 24 && key.length !== 32)
            throw new Error('AES key must be 16, 24 or 32 bytes long.');
        this.blockCrypter = new Block(key);
    }
 
    protected encryptBlocks(blocks: Uint8Array[]): Uint8Array {
        const modeOfOperation = this.modeOfOperation.encryption;
        let encrypted = modeOfOperation.start();
        for (const block of blocks)
            encrypted = new Uint8Array([...encrypted, ...modeOfOperation.combine(block, block => this.blockCrypter.encrypt(block))]);
        return new Uint8Array([...encrypted, ...modeOfOperation.finish()]);
    }
 
    protected decryptBlocks(blocks: Uint8Array[]): Uint8Array {
        const modeOfOperation = this.modeOfOperation.decryption;
        let decrypted = modeOfOperation.start();
        for (const block of blocks)
            decrypted = new Uint8Array([...decrypted, ...modeOfOperation.combine(block, block => this.blockCrypter.decrypt(block))]);
        return new Uint8Array([...decrypted, ...modeOfOperation.finish()]);
    }
}