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97 lines
3.0 KiB
97 lines
3.0 KiB
import MODES from "./modes";
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import AuthCipher from "./authCipher";
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import StreamCipher from "./streamCipher";
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import Transform from "../cipher-base";
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import * as aes from "./aes";
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import ebtk from "../evp_bytestokey";
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import { inherits as inherits$0 } from "util";
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var inherits = { inherits: inherits$0 }.inherits;
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function Cipher(mode, key, iv) {
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Transform.call(this);
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this._cache = new Splitter();
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this._cipher = new aes.AES(key);
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this._prev = Buffer.from(iv);
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this._mode = mode;
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this._autopadding = true;
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}
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inherits(Cipher, Transform);
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Cipher.prototype._update = function (data) {
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this._cache.add(data);
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var chunk;
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var thing;
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var out = [];
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while ((chunk = this._cache.get())) {
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thing = this._mode.encrypt(this, chunk);
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out.push(thing);
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}
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return Buffer.concat(out);
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};
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var PADDING = Buffer.alloc(16, 0x10);
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Cipher.prototype._final = function () {
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var chunk = this._cache.flush();
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if (this._autopadding) {
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chunk = this._mode.encrypt(this, chunk);
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this._cipher.scrub();
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return chunk;
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}
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if (!chunk.equals(PADDING)) {
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this._cipher.scrub();
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throw new Error('data not multiple of block length');
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}
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};
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Cipher.prototype.setAutoPadding = function (setTo) {
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this._autopadding = !!setTo;
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return this;
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};
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function Splitter() {
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this.cache = Buffer.allocUnsafe(0);
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}
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Splitter.prototype.add = function (data) {
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this.cache = Buffer.concat([this.cache, data]);
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};
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Splitter.prototype.get = function () {
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if (this.cache.length > 15) {
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var out = this.cache.slice(0, 16);
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this.cache = this.cache.slice(16);
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return out;
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}
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return null;
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};
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Splitter.prototype.flush = function () {
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var len = 16 - this.cache.length;
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var padBuff = Buffer.allocUnsafe(len);
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var i = -1;
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while (++i < len) {
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padBuff.writeUInt8(len, i);
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}
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return Buffer.concat([this.cache, padBuff]);
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};
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function createCipheriv(suite, password, iv) {
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var config = MODES[suite.toLowerCase()];
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if (!config)
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throw new TypeError('invalid suite type');
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if (typeof password === 'string')
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password = Buffer.from(password);
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if (password.length !== config.key / 8)
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throw new TypeError('invalid key length ' + password.length);
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if (typeof iv === 'string')
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iv = Buffer.from(iv);
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if (config.mode !== 'GCM' && iv.length !== config.iv)
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throw new TypeError('invalid iv length ' + iv.length);
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if (config.type === 'stream') {
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return new StreamCipher(config.module, password, iv);
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}
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else if (config.type === 'auth') {
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return new AuthCipher(config.module, password, iv);
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}
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return new Cipher(config.module, password, iv);
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}
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function createCipher(suite, password) {
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var config = MODES[suite.toLowerCase()];
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if (!config)
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throw new TypeError('invalid suite type');
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var keys = ebtk(password, false, config.key, config.iv);
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return createCipheriv(suite, keys.key, keys.iv);
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}
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export { createCipheriv };
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export { createCipher };
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