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import typing as t
if t.TYPE_CHECKING:
from gssapi.raw.named_tuples import WrapResult, UnwrapResult
from gssapi.sec_contexts import SecurityContext
def get_mic(
context: "SecurityContext",
message: bytes,
qop: t.Optional[int] = None,
) -> bytes:
"""Generate a MIC for a message.
This method generates a Message Integrity Check token for the
given message. This can be separately trasmitted to the other
entity, unlike wrap, which bundles the MIC and the message
together.
Args:
context (~gssapi.raw.sec_contexts.SecurityContext): the current
security context
message (bytes): the message for which to generate the MIC
qop (int): the requested Quality of Protection
(or None to use the default)
Returns:
bytes: the generated MIC token
Raises:
~gssapi.exceptions.ExpiredContextError
~gssapi.exceptions.MissingContextError
~gssapi.exceptions.BadQoPError
"""
def verify_mic(
context: "SecurityContext",
message: bytes,
token: bytes,
) -> int:
"""Verify that a MIC matches a message.
This method verifies that the given MIC matches the given message.
If the MIC does not match the given message, an exception will
be raised.
Args:
context (~gssapi.raw.sec_contexts.SecurityContext): the current
security context
message (bytes): the message in question
token (bytes): the MIC token in question
Returns:
int: the QoP used.
Raises:
~gssapi.exceptions.InvalidTokenError
~gssapi.exceptions.BadMICError
~gssapi.exceptions.DuplicateTokenError
~gssapi.exceptions.ExpiredTokenError
~gssapi.exceptions.TokenTooLateError
~gssapi.exceptions.TokenTooEarlyError
~gssapi.exceptions.ExpiredContextError
~gssapi.exceptions.MissingContextError
"""
def wrap_size_limit(
context: "SecurityContext",
output_size: int,
confidential: bool = True,
qop: t.Optional[int] = None,
) -> int:
"""Calculate the max message size.
This method calculates the unwrapped/unencrypted message size for
the given maximum wrapped/encrypted message size.
Args:
context (~gssapi.raw.sec_contexts.SecurityContext): the current
security context
output_size (int): the maximum desired wrapped/encrypted message size
confidential (bool): whether or not confidentiality is being used
qop (int): the QoP that will be when you actually call wrap
(or None for the default QoP)
Returns:
int: the maximum unencrypted/unwrapped message size
Raises:
~gssapi.exceptions.MissingContextError
~gssapi.exceptions.ExpiredContextError
~gssapi.exceptions.BadQoPError
"""
def wrap(
context: "SecurityContext",
message: bytes,
confidential: bool = True,
qop: t.Optional[int] = None,
) -> "WrapResult":
"""Wrap/Encrypt a message.
This method wraps or encrypts a message (depending on the value
of confidential) with the given Quality of Protection.
Args:
context (~gssapi.raw.sec_contexts.SecurityContext): the current
security context
message (bytes): the message to wrap or encrypt
confidential (bool): whether or not to encrypt the message (True),
or just wrap it with a MIC (False)
qop (int): the desired Quality of Protection
(or None for the default QoP)
Returns:
WrapResult: the wrapped/encrypted message, and whether or not
encryption was actually used
Raises:
~gssapi.exceptions.ExpiredContextError
~gssapi.exceptions.MissingContextError
~gssapi.exceptions.BadQoPError
"""
def unwrap(
context: "SecurityContext",
message: bytes,
) -> "UnwrapResult":
"""Unwrap/Decrypt a message.
This method unwraps or decrypts a message, depending
on whether the sender used confidentiality.
Args:
context (~gssapi.raw.sec_contexts.SecurityContext): the current
security context
message (bytes): the message to unwrap/decrypt
Returns:
UnwrapResult: the unwrapped/decrypted message, whether or on
encryption was used, and the QoP used
Raises:
~gssapi.exceptions.InvalidTokenError
~gssapi.exceptions.BadMICError
~gssapi.exceptions.DuplicateTokenError
~gssapi.exceptions.ExpiredTokenError
~gssapi.exceptions.TokenTooLateError
~gssapi.exceptions.TokenTooEarlyError
~gssapi.exceptions.ExpiredContextError
~gssapi.exceptions.MissingContextError
"""