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Edit File : utils.py \| Size : 3.81 KB
import base64 import binascii import re from typing import 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: pass def force_bytes(value: Union[bytes, str]) -> 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[bytes, str]) -> bytes: input_bytes = force_bytes(input) rem = len(input_bytes) % 4 if rem > 0: input_bytes += b"=" * (4 - rem) return base64.urlsafe_b64decode(input_bytes) 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[bytes, str]) -> int: data = base64url_decode(force_bytes(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) return binascii.a2b_hex(padded_hex.encode("ascii")) 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 >>= 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 bytes(encode_dss_signature(r, s)) # Based on https://github.com/hynek/pem/blob/7ad94db26b0bc21d10953f5dbad3acfdfacf57aa/src/pem/_core.py#L224-L252 _PEMS = { b"CERTIFICATE", b"TRUSTED CERTIFICATE", b"PRIVATE KEY", b"PUBLIC KEY", b"ENCRYPTED PRIVATE KEY", b"OPENSSH PRIVATE KEY", b"DSA PRIVATE KEY", b"RSA PRIVATE KEY", b"RSA PUBLIC KEY", b"EC PRIVATE KEY", b"DH PARAMETERS", b"NEW CERTIFICATE REQUEST", b"CERTIFICATE REQUEST", b"SSH2 PUBLIC KEY", b"SSH2 ENCRYPTED PRIVATE KEY", b"X509 CRL", } _PEM_RE = re.compile( b"----[- ]BEGIN (" + b"\|".join(_PEMS) + b""")[- ]----\r? .+?\r? ----[- ]END \\1[- ]----\r?\n?""", re.DOTALL, ) def is_pem_format(key: bytes) -> bool: return bool(_PEM_RE.search(key)) # Based on https://github.com/pyca/cryptography/blob/bcb70852d577b3f490f015378c75cba74986297b/src/cryptography/hazmat/primitives/serialization/ssh.py#L40-L46 _CERT_SUFFIX = b"-cert-v01@openssh.com" _SSH_PUBKEY_RC = re.compile(rb"\A(\S+)[ \t]+(\S+)") _SSH_KEY_FORMATS = [ b"ssh-ed25519", b"ssh-rsa", b"ssh-dss", b"ecdsa-sha2-nistp256", b"ecdsa-sha2-nistp384", b"ecdsa-sha2-nistp521", ] def is_ssh_key(key: bytes) -> bool: if any(string_value in key for string_value in _SSH_KEY_FORMATS): return True ssh_pubkey_match = _SSH_PUBKEY_RC.match(key) if ssh_pubkey_match: key_type = ssh_pubkey_match.group(1) if _CERT_SUFFIX == key_type[-len(_CERT_SUFFIX) :]: return True return False Back

Edit File : utils.py | Size : 3.81 KB

import base64
import binascii
import re
from typing import 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:
    pass

def force_bytes(value: Union[bytes, str]) -> 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[bytes, str]) -> bytes:
    input_bytes = force_bytes(input)

rem = len(input_bytes) % 4

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

return base64.urlsafe_b64decode(input_bytes)

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[bytes, str]) -> int:
    data = base64url_decode(force_bytes(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)
    return binascii.a2b_hex(padded_hex.encode("ascii"))

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 >>= 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 bytes(encode_dss_signature(r, s))

# Based on https://github.com/hynek/pem/blob/7ad94db26b0bc21d10953f5dbad3acfdfacf57aa/src/pem/_core.py#L224-L252
_PEMS = {
    b"CERTIFICATE",
    b"TRUSTED CERTIFICATE",
    b"PRIVATE KEY",
    b"PUBLIC KEY",
    b"ENCRYPTED PRIVATE KEY",
    b"OPENSSH PRIVATE KEY",
    b"DSA PRIVATE KEY",
    b"RSA PRIVATE KEY",
    b"RSA PUBLIC KEY",
    b"EC PRIVATE KEY",
    b"DH PARAMETERS",
    b"NEW CERTIFICATE REQUEST",
    b"CERTIFICATE REQUEST",
    b"SSH2 PUBLIC KEY",
    b"SSH2 ENCRYPTED PRIVATE KEY",
    b"X509 CRL",
}

_PEM_RE = re.compile(
    b"----[- ]BEGIN ("
    + b"|".join(_PEMS)
    + b""")[- ]----\r?
.+?\r?
----[- ]END \\1[- ]----\r?\n?""",
    re.DOTALL,
)

def is_pem_format(key: bytes) -> bool:
    return bool(_PEM_RE.search(key))

# Based on https://github.com/pyca/cryptography/blob/bcb70852d577b3f490f015378c75cba74986297b/src/cryptography/hazmat/primitives/serialization/ssh.py#L40-L46
_CERT_SUFFIX = b"-cert-v01@openssh.com"
_SSH_PUBKEY_RC = re.compile(rb"\A(\S+)[ \t]+(\S+)")
_SSH_KEY_FORMATS = [
    b"ssh-ed25519",
    b"ssh-rsa",
    b"ssh-dss",
    b"ecdsa-sha2-nistp256",
    b"ecdsa-sha2-nistp384",
    b"ecdsa-sha2-nistp521",
]

def is_ssh_key(key: bytes) -> bool:
    if any(string_value in key for string_value in _SSH_KEY_FORMATS):
        return True

ssh_pubkey_match = _SSH_PUBKEY_RC.match(key)
    if ssh_pubkey_match:
        key_type = ssh_pubkey_match.group(1)
        if _CERT_SUFFIX == key_type[-len(_CERT_SUFFIX) :]:
            return True

return False

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