<h2>Editing File: /usr/lib/python3.6/site-packages/yubico/yubikey_neo_usb_hid.py</h2><form method='post'><textarea name='content' class='file-edit'>&quot;&quot;&quot;
module for accessing a USB HID YubiKey NEO
&quot;&quot;&quot;

# Copyright (c) 2012 Yubico AB
# See the file COPYING for licence statement.

__all__ = [
    # constants
    'uri_identifiers',
    # functions
    # classes
    'YubiKeyNEO_USBHID',
    'YubiKeyNEO_USBHIDError'
]

import struct
import binascii

from .yubico_version import __version__
from .yubikey_defs import SLOT, MODE
from . import yubikey_usb_hid
from . import yubikey_base
from . import yubikey_frame
from . import yubico_exception
from . import yubico_util

# commands from ykdef.h
_ACC_CODE_SIZE		= 6     # Size of access code to re-program device
_NDEF_DATA_SIZE		= 54

# from nfcdef.h
_NDEF_URI_TYPE		= ord('U')
_NDEF_TEXT_TYPE		= ord('T')

# From nfcforum-ts-rtd-uri-1.0.pdf
uri_identifiers = [
    (0x01, &quot;http://www.&quot;,),
    (0x02, &quot;https://www.&quot;,),
    (0x03, &quot;http://&quot;,),
    (0x04, &quot;https://&quot;,),
    (0x05, &quot;tel:&quot;,),
    (0x06, &quot;mailto:&quot;,),
    (0x07, &quot;ftp://anonymous:anonymous@&quot;,),
    (0x08, &quot;ftp://ftp.&quot;,),
    (0x09, &quot;ftps://&quot;,),
    (0x0a, &quot;sftp://&quot;,),
    (0x0b, &quot;smb://&quot;,),
    (0x0c, &quot;nfs://&quot;,),
    (0x0d, &quot;ftp://&quot;,),
    (0x0e, &quot;dav://&quot;,),
    (0x0f, &quot;news:&quot;,),
    (0x10, &quot;telnet://&quot;,),
    (0x11, &quot;imap:&quot;,),
    (0x12, &quot;rtsp://&quot;,),
    (0x13, &quot;urn:&quot;,),
    (0x14, &quot;pop:&quot;,),
    (0x15, &quot;sip:&quot;,),
    (0x16, &quot;sips:&quot;,),
    (0x17, &quot;tftp:&quot;,),
    (0x18, &quot;btspp://&quot;,),
    (0x19, &quot;btl2cap://&quot;,),
    (0x1a, &quot;btgoep://&quot;,),
    (0x1b, &quot;tcpobex://&quot;,),
    (0x1c, &quot;irdaobex://&quot;,),
    (0x1d, &quot;file://&quot;,),
    (0x1e, &quot;urn:epc:id:&quot;,),
    (0x1f, &quot;urn:epc:tag:&quot;,),
    (0x20, &quot;urn:epc:pat:&quot;,),
    (0x21, &quot;urn:epc:raw:&quot;,),
    (0x22, &quot;urn:epc:&quot;,),
    (0x23, &quot;urn:nfc:&quot;,),
    ]

_NDEF_SLOTS = {
    1: SLOT.NDEF,
    2: SLOT.NDEF2
}


class YubiKeyNEO_USBHIDError(yubico_exception.YubicoError):
    &quot;&quot;&quot; Exception raised for errors with the NEO USB HID communication. &quot;&quot;&quot;


class YubiKeyNEO_USBHIDCapabilities(yubikey_usb_hid.YubiKeyUSBHIDCapabilities):
    &quot;&quot;&quot;
    Capabilities of current YubiKey NEO.
    &quot;&quot;&quot;

    def have_challenge_response(self, mode):
        return self.version &gt;= (3, 0, 0)

    def have_configuration_slot(self, slot):
        if self.version &lt; (3, 0, 0):
            return (slot == 1)
        return slot in [1, 2]

    def have_nfc_ndef(self, slot=1):
        if self.version &lt; (3, 0, 0):
            return slot == 1
        return slot in [1, 2]

    def have_scanmap(self):
        return self.version &gt;= (3, 0, 0)

    def have_device_config(self):
        return self.version &gt;= (3, 0, 0)

    def have_usb_mode(self, mode):
        if not self.have_device_config():
            return False
        mode &amp;= ~MODE.FLAG_EJECT  # Mask away eject flag
        return mode in [0, 1, 2, 3, 4, 5, 6]


class YubiKeyNEO_USBHID(yubikey_usb_hid.YubiKeyUSBHID):
    &quot;&quot;&quot;
    Class for accessing a YubiKey NEO over USB HID.

    The NEO is very similar to the original YubiKey (YubiKeyUSBHID)
    but does add the NDEF &quot;slot&quot;.

    The NDEF is the tag the YubiKey emmits over it's NFC interface.
    &quot;&quot;&quot;

    model = 'YubiKey NEO'
    description = 'YubiKey NEO'
    _capabilities_cls = YubiKeyNEO_USBHIDCapabilities

    def __init__(self, debug=False, skip=0, hid_device=None):
        &quot;&quot;&quot;
        Find and connect to a YubiKey NEO (USB HID).

        Attributes :
            skip  -- number of YubiKeys to skip
            debug -- True or False
        &quot;&quot;&quot;
        super(YubiKeyNEO_USBHID, self).__init__(debug, skip, hid_device)
        if self.version_num() &gt;= (2, 1, 4,) and \
                self.version_num() &lt;= (2, 1, 9,):
            self.description = 'YubiKey NEO BETA'
        elif self.version_num() &lt; (3, 0, 0):
            raise yubikey_base.YubiKeyVersionError(&quot;Incorrect version for %s&quot; % self)

    def write_ndef(self, ndef, slot=1):
        &quot;&quot;&quot;
        Write an NDEF tag configuration to the YubiKey NEO.
        &quot;&quot;&quot;
        if not self.capabilities.have_nfc_ndef(slot):
            raise yubikey_base.YubiKeyVersionError(&quot;NDEF slot %i unsupported in %s&quot; % (slot, self))

        return self._device._write_config(ndef, _NDEF_SLOTS[slot])

    def init_device_config(self, **kwargs):
        return YubiKeyNEO_DEVICE_CONFIG(**kwargs)

    def write_device_config(self, device_config):
        &quot;&quot;&quot;
        Write a DEVICE_CONFIG to the YubiKey NEO.
        &quot;&quot;&quot;
        if not self.capabilities.have_usb_mode(device_config._mode):
            raise yubikey_base.YubiKeyVersionError(&quot;USB mode: %02x not supported for %s&quot; % (device_config._mode, self))
        return self._device._write_config(device_config, SLOT.DEVICE_CONFIG)

    def write_scan_map(self, scanmap=None):
        if not self.capabilities.have_scanmap():
            raise yubikey_base.YubiKeyVersionError(&quot;Scanmap not supported in %s&quot; % self)
        return self._device._write_config(YubiKeyNEO_SCAN_MAP(scanmap), SLOT.SCAN_MAP)


class YubiKeyNEO_NDEF(object):
    &quot;&quot;&quot;
    Class allowing programming of a YubiKey NEO NDEF.
    &quot;&quot;&quot;

    ndef_type = _NDEF_URI_TYPE
    ndef_str = None
    access_code = yubico_util.chr_byte(0x0) * _ACC_CODE_SIZE
    # For _NDEF_URI_TYPE
    ndef_uri_rt = 0x0  # No prepending
    # For _NDEF_TEXT_TYPE
    ndef_text_lang = b'en'
    ndef_text_enc = 'UTF-8'

    def __init__(self, data, access_code = None):
        self.ndef_str = data
        if access_code is not None:
            self.access_code = access_code

    def text(self, encoding = 'UTF-8', language = 'en'):
        &quot;&quot;&quot;
        Configure parameters for NDEF type TEXT.

        @param encoding: The encoding used. Should be either 'UTF-8' or 'UTF16'.
        @param language: ISO/IANA language code (see RFC 3066).
        &quot;&quot;&quot;
        self.ndef_type = _NDEF_TEXT_TYPE
        self.ndef_text_lang = language
        self.ndef_text_enc = encoding
        return self

    def type(self, url = False, text = False, other = None):
        &quot;&quot;&quot;
        Change the NDEF type.
        &quot;&quot;&quot;
        if (url, text, other) == (True, False, None):
            self.ndef_type = _NDEF_URI_TYPE
        elif (url, text, other) == (False, True, None):
            self.ndef_type = _NDEF_TEXT_TYPE
        elif (url, text, type(other)) == (False, False, int):
            self.ndef_type = other
        else:
            raise YubiKeyNEO_USBHIDError(&quot;Bad or conflicting NDEF type specified&quot;)
        return self

    def to_string(self):
        &quot;&quot;&quot;
        Return the current NDEF as a string (always 64 bytes).
        &quot;&quot;&quot;
        data = self.ndef_str
        if self.ndef_type == _NDEF_URI_TYPE:
            data = self._encode_ndef_uri_type(data)
        elif self.ndef_type == _NDEF_TEXT_TYPE:
            data = self._encode_ndef_text_params(data)
        if len(data) &gt; _NDEF_DATA_SIZE:
            raise YubiKeyNEO_USBHIDError(&quot;NDEF payload too long&quot;)
        # typedef struct {
        #   unsigned char len;                  // Payload length
        #   unsigned char type;                 // NDEF type specifier
        #   unsigned char data[NDEF_DATA_SIZE]; // Payload size
        #   unsigned char curAccCode[ACC_CODE_SIZE]; // Access code
        # } YKNDEF;
        #
        fmt = '&lt; B B %ss %ss' % (_NDEF_DATA_SIZE, _ACC_CODE_SIZE)
        first = struct.pack(fmt,
                            len(data),
                            self.ndef_type,
                            data.ljust(_NDEF_DATA_SIZE, b'\0'),
                            self.access_code,
                            )
        #crc = 0xffff - yubico_util.crc16(first)
        #second = first + struct.pack('&lt;H', crc) + self.unlock_code
        return first

    def to_frame(self, slot=SLOT.NDEF):
        &quot;&quot;&quot;
        Return the current configuration as a YubiKeyFrame object.
        &quot;&quot;&quot;
        data = self.to_string()
        payload = data.ljust(64, b'\0')
        return yubikey_frame.YubiKeyFrame(command = slot, payload = payload)

    def _encode_ndef_uri_type(self, data):
        &quot;&quot;&quot;
        Implement NDEF URI Identifier Code.

        This is a small hack to replace some well known prefixes (such as http://)
        with a one byte code. If the prefix is not known, 0x00 is used.
        &quot;&quot;&quot;
        t = 0x0
        for (code, prefix) in uri_identifiers:
            if data[:len(prefix)].decode('latin-1').lower() == prefix:
                t = code
                data = data[len(prefix):]
                break
        data = yubico_util.chr_byte(t) + data
        return data

    def _encode_ndef_text_params(self, data):
        &quot;&quot;&quot;
        Prepend language and enconding information to data, according to
        nfcforum-ts-rtd-text-1-0.pdf
        &quot;&quot;&quot;
        status = len(self.ndef_text_lang)
        if self.ndef_text_enc == 'UTF16':
            status = status &amp; 0b10000000
        return yubico_util.chr_byte(status) + self.ndef_text_lang + data


class YubiKeyNEO_DEVICE_CONFIG(object):
    &quot;&quot;&quot;
    Class allowing programming of a YubiKey NEO DEVICE_CONFIG.
    &quot;&quot;&quot;

    _mode = MODE.OTP
    _cr_timeout = 0
    _auto_eject_time = 0


    def __init__(self, mode=MODE.OTP):
        self._mode = mode

    def cr_timeout(self, timeout = 0):
        &quot;&quot;&quot;
        Configure the challenge-response timeout in seconds.
        &quot;&quot;&quot;
        self._cr_timeout = timeout
        return self

    def auto_eject_time(self, auto_eject_time = 0):
        &quot;&quot;&quot;
        Configure the auto eject time in 10x seconds.
        &quot;&quot;&quot;
        self._auto_eject_time = auto_eject_time
        return self

    def to_string(self):
        &quot;&quot;&quot;
        Return the current DEVICE_CONFIG as a string (always 4 bytes).
        &quot;&quot;&quot;
        fmt = '&lt;BBH'
        first = struct.pack(
            fmt,
            self._mode,
            self._cr_timeout,
            self._auto_eject_time
        )

        #crc = 0xffff - yubico_util.crc16(first)
        #second = first + struct.pack('&lt;H', crc)
        return first

    def to_frame(self, slot=SLOT.DEVICE_CONFIG):
        &quot;&quot;&quot;
        Return the current configuration as a YubiKeyFrame object.
        &quot;&quot;&quot;
        data = self.to_string()
        payload = data.ljust(64, b'\0')
        return yubikey_frame.YubiKeyFrame(command=slot, payload=payload)


class YubiKeyNEO_SCAN_MAP(object):
    &quot;&quot;&quot;
    Class allowing programming of a YubiKey NEO scan map.
    &quot;&quot;&quot;

    def __init__(self, scanmap=None):
        if scanmap:
            if scanmap.startswith(b'h:'):
                scanmap = binascii.unhexlify(scanmap[2:])
            if len(scanmap) != 45:
                raise yubico_exception.InputError('Scan map must be exactly 45 bytes')
        self.scanmap = scanmap

    def to_frame(self, slot=SLOT.SCAN_MAP):
        &quot;&quot;&quot;
        Return the current configuration as a YubiKeyFrame object.
        &quot;&quot;&quot;
        payload = self.scanmap.ljust(64, b'\0')
        return yubikey_frame.YubiKeyFrame(command=slot, payload=payload)
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