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Текущая директория: /opt/BitGoJS/node_modules/asmcrypto.js/src/pbkdf2

Просмотр файла: pbkdf2.js

import { is_string } from '../utils';
import { IllegalArgumentError, IllegalStateError } from '../errors';

export class pbkdf2_constructor {
  constructor(options) {
    options = options || {};

    if (!options.hmac) throw new SyntaxError("option 'hmac' is required");

    if (!options.hmac.HMAC_SIZE)
      throw new SyntaxError("option 'hmac' supplied doesn't seem to be a valid HMAC function");

    this.hmac = options.hmac;
    this.count = options.count || 4096;
    this.length = options.length || this.hmac.HMAC_SIZE;

    this.result = null;

    var password = options.password;
    if (password || is_string(password)) this.reset(options);

    return this;
  }

  reset(options) {
    this.result = null;

    this.hmac.reset(options);

    return this;
  }

  generate(salt, count, length) {
    if (this.result !== null) throw new IllegalStateError('state must be reset before processing new data');

    if (!salt && !is_string(salt)) throw new IllegalArgumentError("bad 'salt' value");

    count = count || this.count;
    length = length || this.length;

    this.result = new Uint8Array(length);

    var blocks = Math.ceil(length / this.hmac.HMAC_SIZE);

    for (var i = 1; i <= blocks; ++i) {
      var j = (i - 1) * this.hmac.HMAC_SIZE;
      var l = (i < blocks ? 0 : length % this.hmac.HMAC_SIZE) || this.hmac.HMAC_SIZE;
      var tmp = new Uint8Array(
        this.hmac
          .reset()
          .process(salt)
          .process(new Uint8Array([(i >>> 24) & 0xff, (i >>> 16) & 0xff, (i >>> 8) & 0xff, i & 0xff]))
          .finish().result,
      );
      this.result.set(tmp.subarray(0, l), j);
      for (var k = 1; k < count; ++k) {
        tmp = new Uint8Array(
          this.hmac
            .reset()
            .process(tmp)
            .finish().result,
        );
        for (var r = 0; r < l; ++r) this.result[j + r] ^= tmp[r];
      }
    }

    return this;
  }
}

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