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• .. (вверх)
• [DIR] ..
• [FILE] hash.js
• [DIR] sha1
• [DIR] sha256
• [DIR] sha512

Просмотр файла: hash.js

import { _heap_write, is_buffer, is_bytes, is_string, string_to_bytes } from '../utils';
import { IllegalStateError } from '../errors';

export function hash_reset() {
  this.result = null;
  this.pos = 0;
  this.len = 0;

  this.asm.reset();

  return this;
}

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

  if (is_string(data)) data = string_to_bytes(data);

  if (is_buffer(data)) data = new Uint8Array(data);

  if (!is_bytes(data)) throw new TypeError("data isn't of expected type");

  var asm = this.asm,
    heap = this.heap,
    hpos = this.pos,
    hlen = this.len,
    dpos = 0,
    dlen = data.length,
    wlen = 0;

  while (dlen > 0) {
    wlen = _heap_write(heap, hpos + hlen, data, dpos, dlen);
    hlen += wlen;
    dpos += wlen;
    dlen -= wlen;

    wlen = asm.process(hpos, hlen);

    hpos += wlen;
    hlen -= wlen;

    if (!hlen) hpos = 0;
  }

  this.pos = hpos;
  this.len = hlen;

  return this;
}

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

  this.asm.finish(this.pos, this.len, 0);

  this.result = new Uint8Array(this.HASH_SIZE);
  this.result.set(this.heap.subarray(0, this.HASH_SIZE));

  this.pos = 0;
  this.len = 0;

  return this;
}

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