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__pycache__	-	Open
aead.py	6.1 MB	View DL Edit
backend.py	86.21 MB	View DL Edit
ciphers.py	10.15 MB	View DL Edit
cmac.py	2.78 MB	View DL Edit
decode_asn1.py	1.09 MB	View DL Edit
dh.py	10.95 MB	View DL Edit
dsa.py	10.46 MB	View DL Edit
ec.py	12.54 MB	View DL Edit
ed448.py	5.61 MB	View DL Edit
ed25519.py	5.65 MB	View DL Edit
encode_asn1.py	570 B	View DL Edit
hashes.py	3.03 MB	View DL Edit
hmac.py	2.87 MB	View DL Edit
poly1305.py	2.29 MB	View DL Edit
rsa.py	20.95 MB	View DL Edit
utils.py	2.39 MB	View DL Edit
x448.py	4.04 MB	View DL Edit
x509.py	1.42 MB	View DL Edit
x25519.py	4.51 MB	View DL Edit
__init__.py	271 B	View DL Edit

Edit file: /usr/lib64/python3.9/site-packages/cryptography/hazmat/backends/openssl/dsa.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.

import typing

from cryptography import utils
from cryptography.exceptions import InvalidSignature
from cryptography.hazmat.backends.openssl.utils import (
    _calculate_digest_and_algorithm,
    _check_not_prehashed,
    _warn_sign_verify_deprecated,
)
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import (
    AsymmetricSignatureContext,
    AsymmetricVerificationContext,
    dsa,
    utils as asym_utils,
)

def _dsa_sig_sign(backend, private_key, data):
    sig_buf_len = backend._lib.DSA_size(private_key._dsa_cdata)
    sig_buf = backend._ffi.new("unsigned char[]", sig_buf_len)
    buflen = backend._ffi.new("unsigned int *")

# The first parameter passed to DSA_sign is unused by OpenSSL but
    # must be an integer.
    res = backend._lib.DSA_sign(
        0, data, len(data), sig_buf, buflen, private_key._dsa_cdata
    )
    backend.openssl_assert(res == 1)
    backend.openssl_assert(buflen[0])

return backend._ffi.buffer(sig_buf)[: buflen[0]]

def _dsa_sig_verify(backend, public_key, signature, data):
    # The first parameter passed to DSA_verify is unused by OpenSSL but
    # must be an integer.
    res = backend._lib.DSA_verify(
        0, data, len(data), signature, len(signature), public_key._dsa_cdata
    )

if res != 1:
        backend._consume_errors()
        raise InvalidSignature

class _DSAVerificationContext(AsymmetricVerificationContext):
    def __init__(self, backend, public_key, signature, algorithm):
        self._backend = backend
        self._public_key = public_key
        self._signature = signature
        self._algorithm = algorithm

self._hash_ctx = hashes.Hash(self._algorithm, self._backend)

def update(self, data: bytes):
        self._hash_ctx.update(data)

def verify(self) -> None:
        data_to_verify = self._hash_ctx.finalize()

_dsa_sig_verify(
            self._backend, self._public_key, self._signature, data_to_verify
        )

class _DSASignatureContext(AsymmetricSignatureContext):
    def __init__(
        self,
        backend,
        private_key: dsa.DSAPrivateKey,
        algorithm: hashes.HashAlgorithm,
    ):
        self._backend = backend
        self._private_key = private_key
        self._algorithm = algorithm
        self._hash_ctx = hashes.Hash(self._algorithm, self._backend)

def update(self, data: bytes) -> None:
        self._hash_ctx.update(data)

def finalize(self) -> bytes:
        data_to_sign = self._hash_ctx.finalize()
        return _dsa_sig_sign(self._backend, self._private_key, data_to_sign)

class _DSAParameters(dsa.DSAParameters):
    def __init__(self, backend, dsa_cdata):
        self._backend = backend
        self._dsa_cdata = dsa_cdata

def parameter_numbers(self) -> dsa.DSAParameterNumbers:
        p = self._backend._ffi.new("BIGNUM **")
        q = self._backend._ffi.new("BIGNUM **")
        g = self._backend._ffi.new("BIGNUM **")
        self._backend._lib.DSA_get0_pqg(self._dsa_cdata, p, q, g)
        self._backend.openssl_assert(p[0] != self._backend._ffi.NULL)
        self._backend.openssl_assert(q[0] != self._backend._ffi.NULL)
        self._backend.openssl_assert(g[0] != self._backend._ffi.NULL)
        return dsa.DSAParameterNumbers(
            p=self._backend._bn_to_int(p[0]),
            q=self._backend._bn_to_int(q[0]),
            g=self._backend._bn_to_int(g[0]),
        )

def generate_private_key(self) -> dsa.DSAPrivateKey:
        return self._backend.generate_dsa_private_key(self)

class _DSAPrivateKey(dsa.DSAPrivateKey):
    def __init__(self, backend, dsa_cdata, evp_pkey):
        self._backend = backend
        self._dsa_cdata = dsa_cdata
        self._evp_pkey = evp_pkey

p = self._backend._ffi.new("BIGNUM **")
        self._backend._lib.DSA_get0_pqg(
            dsa_cdata, p, self._backend._ffi.NULL, self._backend._ffi.NULL
        )
        self._backend.openssl_assert(p[0] != backend._ffi.NULL)
        self._key_size = self._backend._lib.BN_num_bits(p[0])

key_size = utils.read_only_property("_key_size")

def signer(
        self, signature_algorithm: hashes.HashAlgorithm
    ) -> AsymmetricSignatureContext:
        _warn_sign_verify_deprecated()
        _check_not_prehashed(signature_algorithm)
        return _DSASignatureContext(self._backend, self, signature_algorithm)

def private_numbers(self) -> dsa.DSAPrivateNumbers:
        p = self._backend._ffi.new("BIGNUM **")
        q = self._backend._ffi.new("BIGNUM **")
        g = self._backend._ffi.new("BIGNUM **")
        pub_key = self._backend._ffi.new("BIGNUM **")
        priv_key = self._backend._ffi.new("BIGNUM **")
        self._backend._lib.DSA_get0_pqg(self._dsa_cdata, p, q, g)
        self._backend.openssl_assert(p[0] != self._backend._ffi.NULL)
        self._backend.openssl_assert(q[0] != self._backend._ffi.NULL)
        self._backend.openssl_assert(g[0] != self._backend._ffi.NULL)
        self._backend._lib.DSA_get0_key(self._dsa_cdata, pub_key, priv_key)
        self._backend.openssl_assert(pub_key[0] != self._backend._ffi.NULL)
        self._backend.openssl_assert(priv_key[0] != self._backend._ffi.NULL)
        return dsa.DSAPrivateNumbers(
            public_numbers=dsa.DSAPublicNumbers(
                parameter_numbers=dsa.DSAParameterNumbers(
                    p=self._backend._bn_to_int(p[0]),
                    q=self._backend._bn_to_int(q[0]),
                    g=self._backend._bn_to_int(g[0]),
                ),
                y=self._backend._bn_to_int(pub_key[0]),
            ),
            x=self._backend._bn_to_int(priv_key[0]),
        )

def public_key(self) -> dsa.DSAPublicKey:
        dsa_cdata = self._backend._lib.DSAparams_dup(self._dsa_cdata)
        self._backend.openssl_assert(dsa_cdata != self._backend._ffi.NULL)
        dsa_cdata = self._backend._ffi.gc(
            dsa_cdata, self._backend._lib.DSA_free
        )
        pub_key = self._backend._ffi.new("BIGNUM **")
        self._backend._lib.DSA_get0_key(
            self._dsa_cdata, pub_key, self._backend._ffi.NULL
        )
        self._backend.openssl_assert(pub_key[0] != self._backend._ffi.NULL)
        pub_key_dup = self._backend._lib.BN_dup(pub_key[0])
        res = self._backend._lib.DSA_set0_key(
            dsa_cdata, pub_key_dup, self._backend._ffi.NULL
        )
        self._backend.openssl_assert(res == 1)
        evp_pkey = self._backend._dsa_cdata_to_evp_pkey(dsa_cdata)
        return _DSAPublicKey(self._backend, dsa_cdata, evp_pkey)

def parameters(self) -> dsa.DSAParameters:
        dsa_cdata = self._backend._lib.DSAparams_dup(self._dsa_cdata)
        self._backend.openssl_assert(dsa_cdata != self._backend._ffi.NULL)
        dsa_cdata = self._backend._ffi.gc(
            dsa_cdata, self._backend._lib.DSA_free
        )
        return _DSAParameters(self._backend, dsa_cdata)

def private_bytes(
        self,
        encoding: serialization.Encoding,
        format: serialization.PrivateFormat,
        encryption_algorithm: serialization.KeySerializationEncryption,
    ) -> bytes:
        return self._backend._private_key_bytes(
            encoding,
            format,
            encryption_algorithm,
            self,
            self._evp_pkey,
            self._dsa_cdata,
        )

def sign(
        self,
        data: bytes,
        algorithm: typing.Union[asym_utils.Prehashed, hashes.HashAlgorithm],
    ) -> bytes:
        data, algorithm = _calculate_digest_and_algorithm(
            self._backend, data, algorithm
        )
        return _dsa_sig_sign(self._backend, self, data)

class _DSAPublicKey(dsa.DSAPublicKey):
    def __init__(self, backend, dsa_cdata, evp_pkey):
        self._backend = backend
        self._dsa_cdata = dsa_cdata
        self._evp_pkey = evp_pkey
        p = self._backend._ffi.new("BIGNUM **")
        self._backend._lib.DSA_get0_pqg(
            dsa_cdata, p, self._backend._ffi.NULL, self._backend._ffi.NULL
        )
        self._backend.openssl_assert(p[0] != backend._ffi.NULL)
        self._key_size = self._backend._lib.BN_num_bits(p[0])

key_size = utils.read_only_property("_key_size")

def verifier(
        self,
        signature: bytes,
        signature_algorithm: hashes.HashAlgorithm,
    ) -> AsymmetricVerificationContext:
        _warn_sign_verify_deprecated()
        utils._check_bytes("signature", signature)

_check_not_prehashed(signature_algorithm)
        return _DSAVerificationContext(
            self._backend, self, signature, signature_algorithm
        )

def public_numbers(self) -> dsa.DSAPublicNumbers:
        p = self._backend._ffi.new("BIGNUM **")
        q = self._backend._ffi.new("BIGNUM **")
        g = self._backend._ffi.new("BIGNUM **")
        pub_key = self._backend._ffi.new("BIGNUM **")
        self._backend._lib.DSA_get0_pqg(self._dsa_cdata, p, q, g)
        self._backend.openssl_assert(p[0] != self._backend._ffi.NULL)
        self._backend.openssl_assert(q[0] != self._backend._ffi.NULL)
        self._backend.openssl_assert(g[0] != self._backend._ffi.NULL)
        self._backend._lib.DSA_get0_key(
            self._dsa_cdata, pub_key, self._backend._ffi.NULL
        )
        self._backend.openssl_assert(pub_key[0] != self._backend._ffi.NULL)
        return dsa.DSAPublicNumbers(
            parameter_numbers=dsa.DSAParameterNumbers(
                p=self._backend._bn_to_int(p[0]),
                q=self._backend._bn_to_int(q[0]),
                g=self._backend._bn_to_int(g[0]),
            ),
            y=self._backend._bn_to_int(pub_key[0]),
        )

def parameters(self) -> dsa.DSAParameters:
        dsa_cdata = self._backend._lib.DSAparams_dup(self._dsa_cdata)
        dsa_cdata = self._backend._ffi.gc(
            dsa_cdata, self._backend._lib.DSA_free
        )
        return _DSAParameters(self._backend, dsa_cdata)

def public_bytes(
        self,
        encoding: serialization.Encoding,
        format: serialization.PublicFormat,
    ) -> bytes:
        return self._backend._public_key_bytes(
            encoding, format, self, self._evp_pkey, None
        )

def verify(
        self,
        signature: bytes,
        data: bytes,
        algorithm: typing.Union[asym_utils.Prehashed, hashes.HashAlgorithm],
    ) -> None:
        data, algorithm = _calculate_digest_and_algorithm(
            self._backend, data, algorithm
        )
        return _dsa_sig_verify(self._backend, self, signature, data)

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