node-ciphers/dist/aes/base/index.cjs

Lightweight AES and DES encryption library for Node.js, featuring flexible encoding, multiple cipher modes, and TypeScript support.

'use strict';

const node_crypto = require('node:crypto');
const base = require('../../base.cjs');
const constants = require('../../constants.cjs');

const keyLengthToBitsMap = {
    16: 128,
    24: 192,
    32: 256,
};
class BaseAesCipher extends base.BaseCipher {
    #algorithm;
    #key;
    constructor(key, mode, encodingOptions) {
        super(encodingOptions);
        this.#key = this.dataToBuffer(key, this.encodingOptions.key);
        const modeBits = keyLengthToBitsMap[this.#key.byteLength];
        if (!modeBits)
            throw new Error('Invalid key length');
        this.#algorithm = `aes-${modeBits}-${mode}`;
        if (!constants.availableCiphers.includes(this.#algorithm))
            throw new Error('Invalid algorithm');
    }
    get algorithm() {
        return this.#algorithm;
    }
    createCipher(iv, options) {
        return node_crypto.createCipheriv(this.#algorithm, this.#key, iv, options);
    }
    createDecipher(iv, options) {
        return node_crypto.createDecipheriv(this.#algorithm, this.#key, iv, options);
    }
}

exports.BaseAesCipher = BaseAesCipher;
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