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Edit File : utils.py \| Size : 2.45 KB
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 = "%0x" % (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) Back

Edit File : utils.py | Size : 2.45 KB

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)

Back