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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/asmcrypto.js/src/hmac

Просмотр файла: hmac-sha512.js

import { _sha512_hash_size, get_sha512_instance, sha512_constructor } from '../hash/sha512/sha512';
import { hmac_constructor, _hmac_key } from './hmac';
import { is_string, string_to_bytes } from '../utils';
import { IllegalStateError } from '../errors';

export class hmac_sha512_constructor extends hmac_constructor {
  constructor(options) {
    options = options || {};

    if (!(options.hash instanceof sha512_constructor)) options.hash = get_sha512_instance();

    super(options);
  }

  reset(options) {
    options = options || {};

    this.result = null;
    this.hash.reset();

    var password = options.password;
    if (password !== undefined) {
      if (is_string(password)) password = string_to_bytes(password);

      var key = (this.key = _hmac_key(this.hash, password));
      this.hash
        .reset()
        .asm.hmac_init(
          (key[0] << 24) | (key[1] << 16) | (key[2] << 8) | key[3],
          (key[4] << 24) | (key[5] << 16) | (key[6] << 8) | key[7],
          (key[8] << 24) | (key[9] << 16) | (key[10] << 8) | key[11],
          (key[12] << 24) | (key[13] << 16) | (key[14] << 8) | key[15],
          (key[16] << 24) | (key[17] << 16) | (key[18] << 8) | key[19],
          (key[20] << 24) | (key[21] << 16) | (key[22] << 8) | key[23],
          (key[24] << 24) | (key[25] << 16) | (key[26] << 8) | key[27],
          (key[28] << 24) | (key[29] << 16) | (key[30] << 8) | key[31],
          (key[32] << 24) | (key[33] << 16) | (key[34] << 8) | key[35],
          (key[36] << 24) | (key[37] << 16) | (key[38] << 8) | key[39],
          (key[40] << 24) | (key[41] << 16) | (key[42] << 8) | key[43],
          (key[44] << 24) | (key[45] << 16) | (key[46] << 8) | key[47],
          (key[48] << 24) | (key[49] << 16) | (key[50] << 8) | key[51],
          (key[52] << 24) | (key[53] << 16) | (key[54] << 8) | key[55],
          (key[56] << 24) | (key[57] << 16) | (key[58] << 8) | key[59],
          (key[60] << 24) | (key[61] << 16) | (key[62] << 8) | key[63],
          (key[64] << 24) | (key[65] << 16) | (key[66] << 8) | key[67],
          (key[68] << 24) | (key[69] << 16) | (key[70] << 8) | key[71],
          (key[72] << 24) | (key[73] << 16) | (key[74] << 8) | key[75],
          (key[76] << 24) | (key[77] << 16) | (key[78] << 8) | key[79],
          (key[80] << 24) | (key[81] << 16) | (key[82] << 8) | key[83],
          (key[84] << 24) | (key[85] << 16) | (key[86] << 8) | key[87],
          (key[88] << 24) | (key[89] << 16) | (key[90] << 8) | key[91],
          (key[92] << 24) | (key[93] << 16) | (key[94] << 8) | key[95],
          (key[96] << 24) | (key[97] << 16) | (key[98] << 8) | key[99],
          (key[100] << 24) | (key[101] << 16) | (key[102] << 8) | key[103],
          (key[104] << 24) | (key[105] << 16) | (key[106] << 8) | key[107],
          (key[108] << 24) | (key[109] << 16) | (key[110] << 8) | key[111],
          (key[112] << 24) | (key[113] << 16) | (key[114] << 8) | key[115],
          (key[116] << 24) | (key[117] << 16) | (key[118] << 8) | key[119],
          (key[120] << 24) | (key[121] << 16) | (key[122] << 8) | key[123],
          (key[124] << 24) | (key[125] << 16) | (key[126] << 8) | key[127],
        );
    } else {
      this.hash.asm.hmac_reset();
    }

    var verify = options.verify;
    if (verify !== undefined) {
      this._hmac_init_verify(verify);
    } else {
      this.verify = null;
    }

    return this;
  }

  /**
   * @return {hmac_sha512_constructor}
   */
  finish() {
    if (this.key === null) throw new IllegalStateError('no key is associated with the instance');

    if (this.result !== null) throw new IllegalStateError('state must be reset before processing new data');

    var hash = this.hash,
      asm = this.hash.asm,
      heap = this.hash.heap;

    asm.hmac_finish(hash.pos, hash.len, 0);

    var verify = this.verify;
    var result = new Uint8Array(_sha512_hash_size);
    result.set(heap.subarray(0, _sha512_hash_size));

    if (verify) {
      if (verify.length === result.length) {
        var diff = 0;
        for (var i = 0; i < verify.length; i++) {
          diff |= verify[i] ^ result[i];
        }
        this.result = !diff;
      } else {
        this.result = false;
      }
    } else {
      this.result = result;
    }

    return this;
  }
}

hmac_sha512_constructor.BLOCK_SIZE = sha512_constructor.BLOCK_SIZE;
hmac_sha512_constructor.HMAC_SIZE = sha512_constructor.HASH_SIZE;

var hmac_sha512_instance = null;

/**
 * @return {get_hmac_sha512_instance}
 */
export function get_hmac_sha512_instance() {
  if (hmac_sha512_instance === null) hmac_sha512_instance = new hmac_sha512_constructor();
  return hmac_sha512_instance;
}

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