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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //proc/thread-self/root/lib/python3.6/site-packages/jwt/utils.py

import base64
import binascii
import struct

from .compat import binary_type, bytes_from_int, text_type

try:
    from cryptography.hazmat.primitives.asymmetric.utils import (
        decode_dss_signature, encode_dss_signature
    )
except ImportError:
    pass


def force_unicode(value):
    if isinstance(value, binary_type):
        return value.decode('utf-8')
    elif isinstance(value, text_type):
        return value
    else:
        raise TypeError('Expected a string value')


def force_bytes(value):
    if isinstance(value, text_type):
        return value.encode('utf-8')
    elif isinstance(value, binary_type):
        return value
    else:
        raise TypeError('Expected a string value')


def base64url_decode(input):
    if isinstance(input, text_type):
        input = input.encode('ascii')

    rem = len(input) % 4

    if rem > 0:
        input += b'=' * (4 - rem)

    return base64.urlsafe_b64decode(input)


def base64url_encode(input):
    return base64.urlsafe_b64encode(input).replace(b'=', b'')


def to_base64url_uint(val):
    if val < 0:
        raise ValueError('Must be a positive integer')

    int_bytes = bytes_from_int(val)

    if len(int_bytes) == 0:
        int_bytes = b'\x00'

    return base64url_encode(int_bytes)


def from_base64url_uint(val):
    if isinstance(val, text_type):
        val = val.encode('ascii')

    data = base64url_decode(val)

    buf = struct.unpack('%sB' % len(data), data)
    return int(''.join(["%02x" % byte for byte in buf]), 16)


def merge_dict(original, updates):
    if not updates:
        return original

    try:
        merged_options = original.copy()
        merged_options.update(updates)
    except (AttributeError, ValueError) as e:
        raise TypeError('original and updates must be a dictionary: %s' % e)

    return merged_options


def number_to_bytes(num, num_bytes):
    padded_hex = '%0*x' % (2 * num_bytes, num)
    big_endian = binascii.a2b_hex(padded_hex.encode('ascii'))
    return big_endian


def bytes_to_number(string):
    return int(binascii.b2a_hex(string), 16)


def der_to_raw_signature(der_sig, curve):
    num_bits = curve.key_size
    num_bytes = (num_bits + 7) // 8

    r, s = decode_dss_signature(der_sig)

    return number_to_bytes(r, num_bytes) + number_to_bytes(s, num_bytes)


def raw_to_der_signature(raw_sig, curve):
    num_bits = curve.key_size
    num_bytes = (num_bits + 7) // 8

    if len(raw_sig) != 2 * num_bytes:
        raise ValueError('Invalid signature')

    r = bytes_to_number(raw_sig[:num_bytes])
    s = bytes_to_number(raw_sig[num_bytes:])

    return encode_dss_signature(r, s)

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