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/opt/imunify360/venv/lib64/python3.11/site-packages/cryptography/hazmat/primitives/asymmetric/padding.py

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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import annotations

import abc

from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives._asymmetric import (
    AsymmetricPadding as AsymmetricPadding,
)
from cryptography.hazmat.primitives.asymmetric import rsa

class PKCS1v15(AsymmetricPadding):
    name = "EMSA-PKCS1-v1_5"

class _MaxLength:
    "Sentinel value for `MAX_LENGTH`."

class _Auto:
    "Sentinel value for `AUTO`."

class _DigestLength:
    "Sentinel value for `DIGEST_LENGTH`."

class PSS(AsymmetricPadding):
    MAX_LENGTH = _MaxLength()
    AUTO = _Auto()
    DIGEST_LENGTH = _DigestLength()
    name = "EMSA-PSS"
    _salt_length: int | _MaxLength | _Auto | _DigestLength

def __init__(
        self,
        mgf: MGF,
        salt_length: int | _MaxLength | _Auto | _DigestLength,
    ) -> None:
        self._mgf = mgf

if not isinstance(
            salt_length, (int, _MaxLength, _Auto, _DigestLength)
        ):
            raise TypeError(
                "salt_length must be an integer, MAX_LENGTH, "
                "DIGEST_LENGTH, or AUTO"
            )

if isinstance(salt_length, int) and salt_length < 0:
            raise ValueError("salt_length must be zero or greater.")

self._salt_length = salt_length

@property
    def mgf(self) -> MGF:
        return self._mgf

class OAEP(AsymmetricPadding):
    name = "EME-OAEP"

def __init__(
        self,
        mgf: MGF,
        algorithm: hashes.HashAlgorithm,
        label: bytes | None,
    ):
        if not isinstance(algorithm, hashes.HashAlgorithm):
            raise TypeError("Expected instance of hashes.HashAlgorithm.")

self._mgf = mgf
        self._algorithm = algorithm
        self._label = label

@property
    def algorithm(self) -> hashes.HashAlgorithm:
        return self._algorithm

@property
    def mgf(self) -> MGF:
        return self._mgf

class MGF(metaclass=abc.ABCMeta):
    _algorithm: hashes.HashAlgorithm

class MGF1(MGF):
    MAX_LENGTH = _MaxLength()

def __init__(self, algorithm: hashes.HashAlgorithm):
        if not isinstance(algorithm, hashes.HashAlgorithm):
            raise TypeError("Expected instance of hashes.HashAlgorithm.")

self._algorithm = algorithm

def calculate_max_pss_salt_length(
    key: rsa.RSAPrivateKey | rsa.RSAPublicKey,
    hash_algorithm: hashes.HashAlgorithm,
) -> int:
    if not isinstance(key, (rsa.RSAPrivateKey, rsa.RSAPublicKey)):
        raise TypeError("key must be an RSA public or private key")
    # bit length - 1 per RFC 3447
    emlen = (key.key_size + 6) // 8
    salt_length = emlen - hash_algorithm.digest_size - 2
    assert salt_length >= 0
    return salt_length

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padding.py	2.82 KB	lrw-r--r--	2026-04-14 09:45:17	Edit Download recursive recursive
rsa.py	7.46 KB	lrw-r--r--	2026-04-14 09:45:17	Edit Download recursive recursive
types.py	2.93 KB	lrw-r--r--	2026-04-14 09:45:17	Edit Download recursive recursive
utils.py	790 B	lrw-r--r--	2026-04-14 09:45:17	Edit Download recursive recursive
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