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。 .
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Current File : //opt/imunify360/venv/lib/python3.11/site-packages/jwt/utils.py
import base64
import binascii
from typing import Any, Union

try:
    from cryptography.hazmat.primitives.asymmetric.ec import EllipticCurve
    from cryptography.hazmat.primitives.asymmetric.utils import (
        decode_dss_signature,
        encode_dss_signature,
    )
except ModuleNotFoundError:
    EllipticCurve = Any  # type: ignore


def force_bytes(value: Union[str, bytes]) -> bytes:
    if isinstance(value, str):
        return value.encode("utf-8")
    elif isinstance(value, bytes):
        return value
    else:
        raise TypeError("Expected a string value")


def base64url_decode(input: Union[str, bytes]) -> bytes:
    if isinstance(input, str):
        input = input.encode("ascii")

    rem = len(input) % 4

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

    return base64.urlsafe_b64decode(input)


def base64url_encode(input: bytes) -> bytes:
    return base64.urlsafe_b64encode(input).replace(b"=", b"")


def to_base64url_uint(val: int) -> bytes:
    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: Union[str, bytes]) -> int:
    if isinstance(val, str):
        val = val.encode("ascii")

    data = base64url_decode(val)
    return int.from_bytes(data, byteorder="big")


def number_to_bytes(num: int, num_bytes: int) -> 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: bytes) -> int:
    return int(binascii.b2a_hex(string), 16)


def bytes_from_int(val: int) -> bytes:
    remaining = val
    byte_length = 0

    while remaining != 0:
        remaining = remaining >> 8
        byte_length += 1

    return val.to_bytes(byte_length, "big", signed=False)


def der_to_raw_signature(der_sig: bytes, curve: EllipticCurve) -> bytes:
    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: bytes, curve: EllipticCurve) -> bytes:
    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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