hash_pad
j = hash_pad(bf, 2 * bs, j, byte_count, true, bs);
j = hash_pad(bf, 2 * bs, j, byte_count, false, bs);
j = hash_pad(bf, 2 * bs, j, byte_count, false, bs);
j = hash_pad(bf, 4096, j, byte_count, true, bs);
j = hash_pad(bf, 4096, j, byte_count, false, bs);