code: function ADD64AA(v, a, b) {
      var o0 = v[a] + v[b];
      var o1 = v[a + 1] + v[b + 1];
      if (o0 >= 0x100000000) {
          o1++;
      }
      v[a] = o0;
      v[a + 1] = o1;
  }
docs: Blake2B in pure Javascript Adapted from the reference implementation in RFC7693 Ported to Javascript by DC - https://github.com/dcposch 64-bit unsigned addition Sets v[a,a+1] += v[b,b+1] v should be a Uint32Array