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opt / cloudlinux / venv / lib / python3.11 / site-packages / cryptography / hazmat / primitives / asymmetric /

ðŸ“ ..
ðŸ“„ __init__.py(180 B)
ðŸ“ __pycache__
ðŸ“„ dh.py(6.85 KB)
ðŸ“„ dsa.py(8.07 KB)
ðŸ“„ ec.py(12.57 KB)
ðŸ“„ ed25519.py(3.41 KB)
ðŸ“„ ed448.py(3.36 KB)
ðŸ“„ padding.py(2.65 KB)
ðŸ“„ rsa.py(11.35 KB)
ðŸ“„ types.py(2.93 KB)
ðŸ“„ utils.py(790 B)
ðŸ“„ x25519.py(3.36 KB)
ðŸ“„ x448.py(3.28 KB)

Editing: rsa.py

# 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
import typing
from math import gcd

from cryptography.hazmat.primitives import _serialization, hashes
from cryptography.hazmat.primitives._asymmetric import AsymmetricPadding
from cryptography.hazmat.primitives.asymmetric import utils as asym_utils

class RSAPrivateKey(metaclass=abc.ABCMeta):
    @abc.abstractmethod
    def decrypt(self, ciphertext: bytes, padding: AsymmetricPadding) -> bytes:
        """
        Decrypts the provided ciphertext.
        """

@property
    @abc.abstractmethod
    def key_size(self) -> int:
        """
        The bit length of the public modulus.
        """

@abc.abstractmethod
    def public_key(self) -> RSAPublicKey:
        """
        The RSAPublicKey associated with this private key.
        """

@abc.abstractmethod
    def sign(
        self,
        data: bytes,
        padding: AsymmetricPadding,
        algorithm: typing.Union[asym_utils.Prehashed, hashes.HashAlgorithm],
    ) -> bytes:
        """
        Signs the data.
        """

@abc.abstractmethod
    def private_numbers(self) -> RSAPrivateNumbers:
        """
        Returns an RSAPrivateNumbers.
        """

@abc.abstractmethod
    def private_bytes(
        self,
        encoding: _serialization.Encoding,
        format: _serialization.PrivateFormat,
        encryption_algorithm: _serialization.KeySerializationEncryption,
    ) -> bytes:
        """
        Returns the key serialized as bytes.
        """

RSAPrivateKeyWithSerialization = RSAPrivateKey

class RSAPublicKey(metaclass=abc.ABCMeta):
    @abc.abstractmethod
    def encrypt(self, plaintext: bytes, padding: AsymmetricPadding) -> bytes:
        """
        Encrypts the given plaintext.
        """

@property
    @abc.abstractmethod
    def key_size(self) -> int:
        """
        The bit length of the public modulus.
        """

@abc.abstractmethod
    def public_numbers(self) -> RSAPublicNumbers:
        """
        Returns an RSAPublicNumbers
        """

@abc.abstractmethod
    def public_bytes(
        self,
        encoding: _serialization.Encoding,
        format: _serialization.PublicFormat,
    ) -> bytes:
        """
        Returns the key serialized as bytes.
        """

@abc.abstractmethod
    def verify(
        self,
        signature: bytes,
        data: bytes,
        padding: AsymmetricPadding,
        algorithm: typing.Union[asym_utils.Prehashed, hashes.HashAlgorithm],
    ) -> None:
        """
        Verifies the signature of the data.
        """

@abc.abstractmethod
    def recover_data_from_signature(
        self,
        signature: bytes,
        padding: AsymmetricPadding,
        algorithm: typing.Optional[hashes.HashAlgorithm],
    ) -> bytes:
        """
        Recovers the original data from the signature.
        """

@abc.abstractmethod
    def __eq__(self, other: object) -> bool:
        """
        Checks equality.
        """

RSAPublicKeyWithSerialization = RSAPublicKey

def generate_private_key(
    public_exponent: int,
    key_size: int,
    backend: typing.Any = None,
) -> RSAPrivateKey:
    from cryptography.hazmat.backends.openssl.backend import backend as ossl

_verify_rsa_parameters(public_exponent, key_size)
    return ossl.generate_rsa_private_key(public_exponent, key_size)

def _verify_rsa_parameters(public_exponent: int, key_size: int) -> None:
    if public_exponent not in (3, 65537):
        raise ValueError(
            "public_exponent must be either 3 (for legacy compatibility) or "
            "65537. Almost everyone should choose 65537 here!"
        )

if key_size < 512:
        raise ValueError("key_size must be at least 512-bits.")

def _check_private_key_components(
    p: int,
    q: int,
    private_exponent: int,
    dmp1: int,
    dmq1: int,
    iqmp: int,
    public_exponent: int,
    modulus: int,
) -> None:
    if modulus < 3:
        raise ValueError("modulus must be >= 3.")

if p >= modulus:
        raise ValueError("p must be < modulus.")

if q >= modulus:
        raise ValueError("q must be < modulus.")

if dmp1 >= modulus:
        raise ValueError("dmp1 must be < modulus.")

if dmq1 >= modulus:
        raise ValueError("dmq1 must be < modulus.")

if iqmp >= modulus:
        raise ValueError("iqmp must be < modulus.")

if private_exponent >= modulus:
        raise ValueError("private_exponent must be < modulus.")

if public_exponent < 3 or public_exponent >= modulus:
        raise ValueError("public_exponent must be >= 3 and < modulus.")

if public_exponent & 1 == 0:
        raise ValueError("public_exponent must be odd.")

if dmp1 & 1 == 0:
        raise ValueError("dmp1 must be odd.")

if dmq1 & 1 == 0:
        raise ValueError("dmq1 must be odd.")

if p * q != modulus:
        raise ValueError("p*q must equal modulus.")

def _check_public_key_components(e: int, n: int) -> None:
    if n < 3:
        raise ValueError("n must be >= 3.")

if e < 3 or e >= n:
        raise ValueError("e must be >= 3 and < n.")

if e & 1 == 0:
        raise ValueError("e must be odd.")

def _modinv(e: int, m: int) -> int:
    """
    Modular Multiplicative Inverse. Returns x such that: (x*e) mod m == 1
    """
    x1, x2 = 1, 0
    a, b = e, m
    while b > 0:
        q, r = divmod(a, b)
        xn = x1 - q * x2
        a, b, x1, x2 = b, r, x2, xn
    return x1 % m

def rsa_crt_iqmp(p: int, q: int) -> int:
    """
    Compute the CRT (q ** -1) % p value from RSA primes p and q.
    """
    return _modinv(q, p)

def rsa_crt_dmp1(private_exponent: int, p: int) -> int:
    """
    Compute the CRT private_exponent % (p - 1) value from the RSA
    private_exponent (d) and p.
    """
    return private_exponent % (p - 1)

def rsa_crt_dmq1(private_exponent: int, q: int) -> int:
    """
    Compute the CRT private_exponent % (q - 1) value from the RSA
    private_exponent (d) and q.
    """
    return private_exponent % (q - 1)

# Controls the number of iterations rsa_recover_prime_factors will perform
# to obtain the prime factors. Each iteration increments by 2 so the actual
# maximum attempts is half this number.
_MAX_RECOVERY_ATTEMPTS = 1000

def rsa_recover_prime_factors(
    n: int, e: int, d: int
) -> typing.Tuple[int, int]:
    """
    Compute factors p and q from the private exponent d. We assume that n has
    no more than two factors. This function is adapted from code in PyCrypto.
    """
    # See 8.2.2(i) in Handbook of Applied Cryptography.
    ktot = d * e - 1
    # The quantity d*e-1 is a multiple of phi(n), even,
    # and can be represented as t*2^s.
    t = ktot
    while t % 2 == 0:
        t = t // 2
    # Cycle through all multiplicative inverses in Zn.
    # The algorithm is non-deterministic, but there is a 50% chance
    # any candidate a leads to successful factoring.
    # See "Digitalized Signatures and Public Key Functions as Intractable
    # as Factorization", M. Rabin, 1979
    spotted = False
    a = 2
    while not spotted and a < _MAX_RECOVERY_ATTEMPTS:
        k = t
        # Cycle through all values a^{t*2^i}=a^k
        while k < ktot:
            cand = pow(a, k, n)
            # Check if a^k is a non-trivial root of unity (mod n)
            if cand != 1 and cand != (n - 1) and pow(cand, 2, n) == 1:
                # We have found a number such that (cand-1)(cand+1)=0 (mod n).
                # Either of the terms divides n.
                p = gcd(cand + 1, n)
                spotted = True
                break
            k *= 2
        # This value was not any good... let's try another!
        a += 2
    if not spotted:
        raise ValueError("Unable to compute factors p and q from exponent d.")
    # Found !
    q, r = divmod(n, p)
    assert r == 0
    p, q = sorted((p, q), reverse=True)
    return (p, q)

class RSAPrivateNumbers:
    def __init__(
        self,
        p: int,
        q: int,
        d: int,
        dmp1: int,
        dmq1: int,
        iqmp: int,
        public_numbers: RSAPublicNumbers,
    ):
        if (
            not isinstance(p, int)
            or not isinstance(q, int)
            or not isinstance(d, int)
            or not isinstance(dmp1, int)
            or not isinstance(dmq1, int)
            or not isinstance(iqmp, int)
        ):
            raise TypeError(
                "RSAPrivateNumbers p, q, d, dmp1, dmq1, iqmp arguments must"
                " all be an integers."
            )

if not isinstance(public_numbers, RSAPublicNumbers):
            raise TypeError(
                "RSAPrivateNumbers public_numbers must be an RSAPublicNumbers"
                " instance."
            )

self._p = p
        self._q = q
        self._d = d
        self._dmp1 = dmp1
        self._dmq1 = dmq1
        self._iqmp = iqmp
        self._public_numbers = public_numbers

@property
    def p(self) -> int:
        return self._p

@property
    def q(self) -> int:
        return self._q

@property
    def d(self) -> int:
        return self._d

@property
    def dmp1(self) -> int:
        return self._dmp1

@property
    def dmq1(self) -> int:
        return self._dmq1

@property
    def iqmp(self) -> int:
        return self._iqmp

@property
    def public_numbers(self) -> RSAPublicNumbers:
        return self._public_numbers

def private_key(
        self,
        backend: typing.Any = None,
        *,
        unsafe_skip_rsa_key_validation: bool = False,
    ) -> RSAPrivateKey:
        from cryptography.hazmat.backends.openssl.backend import (
            backend as ossl,
        )

return ossl.load_rsa_private_numbers(
            self, unsafe_skip_rsa_key_validation
        )

def __eq__(self, other: object) -> bool:
        if not isinstance(other, RSAPrivateNumbers):
            return NotImplemented

return (
            self.p == other.p
            and self.q == other.q
            and self.d == other.d
            and self.dmp1 == other.dmp1
            and self.dmq1 == other.dmq1
            and self.iqmp == other.iqmp
            and self.public_numbers == other.public_numbers
        )

def __hash__(self) -> int:
        return hash(
            (
                self.p,
                self.q,
                self.d,
                self.dmp1,
                self.dmq1,
                self.iqmp,
                self.public_numbers,
            )
        )

class RSAPublicNumbers:
    def __init__(self, e: int, n: int):
        if not isinstance(e, int) or not isinstance(n, int):
            raise TypeError("RSAPublicNumbers arguments must be integers.")

self._e = e
        self._n = n

@property
    def e(self) -> int:
        return self._e

@property
    def n(self) -> int:
        return self._n

def public_key(self, backend: typing.Any = None) -> RSAPublicKey:
        from cryptography.hazmat.backends.openssl.backend import (
            backend as ossl,
        )

return ossl.load_rsa_public_numbers(self)

def __repr__(self) -> str:
        return "<RSAPublicNumbers(e={0.e}, n={0.n})>".format(self)

def __eq__(self, other: object) -> bool:
        if not isinstance(other, RSAPublicNumbers):
            return NotImplemented

return self.e == other.e and self.n == other.n

def __hash__(self) -> int:
        return hash((self.e, self.n))

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