mirror of
https://github.com/yuzu-emu/mbedtls.git
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22fcf1b5f5
It's useful for more than test_psa_constant_names. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
240 lines
10 KiB
Python
240 lines
10 KiB
Python
"""Collect macro definitions from header files.
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"""
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# Copyright The Mbed TLS Contributors
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import itertools
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import re
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from typing import Dict, Iterable, Iterator, List, Set
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class PSAMacroEnumerator:
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"""Information about constructors of various PSA Crypto types.
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This includes macro names as well as information about their arguments
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when applicable.
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This class only provides ways to enumerate expressions that evaluate to
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values of the covered types. Derived classes are expected to populate
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the set of known constructors of each kind, as well as populate
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`self.arguments_for` for arguments that are not of a kind that is
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enumerated here.
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"""
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def __init__(self) -> None:
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"""Set up an empty set of known constructor macros.
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"""
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self.statuses = set() #type: Set[str]
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self.algorithms = set() #type: Set[str]
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self.ecc_curves = set() #type: Set[str]
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self.dh_groups = set() #type: Set[str]
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self.key_types = set() #type: Set[str]
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self.key_usage_flags = set() #type: Set[str]
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self.hash_algorithms = set() #type: Set[str]
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self.mac_algorithms = set() #type: Set[str]
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self.ka_algorithms = set() #type: Set[str]
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self.kdf_algorithms = set() #type: Set[str]
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self.aead_algorithms = set() #type: Set[str]
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# macro name -> list of argument names
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self.argspecs = {} #type: Dict[str, List[str]]
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# argument name -> list of values
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self.arguments_for = {
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'mac_length': [],
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'min_mac_length': [],
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'tag_length': [],
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'min_tag_length': [],
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} #type: Dict[str, List[str]]
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def gather_arguments(self) -> None:
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"""Populate the list of values for macro arguments.
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Call this after parsing all the inputs.
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"""
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self.arguments_for['hash_alg'] = sorted(self.hash_algorithms)
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self.arguments_for['mac_alg'] = sorted(self.mac_algorithms)
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self.arguments_for['ka_alg'] = sorted(self.ka_algorithms)
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self.arguments_for['kdf_alg'] = sorted(self.kdf_algorithms)
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self.arguments_for['aead_alg'] = sorted(self.aead_algorithms)
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self.arguments_for['curve'] = sorted(self.ecc_curves)
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self.arguments_for['group'] = sorted(self.dh_groups)
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@staticmethod
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def _format_arguments(name: str, arguments: Iterable[str]) -> str:
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"""Format a macro call with arguments.."""
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return name + '(' + ', '.join(arguments) + ')'
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_argument_split_re = re.compile(r' *, *')
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@classmethod
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def _argument_split(cls, arguments: str) -> List[str]:
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return re.split(cls._argument_split_re, arguments)
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def distribute_arguments(self, name: str) -> Iterator[str]:
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"""Generate macro calls with each tested argument set.
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If name is a macro without arguments, just yield "name".
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If name is a macro with arguments, yield a series of
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"name(arg1,...,argN)" where each argument takes each possible
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value at least once.
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"""
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try:
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if name not in self.argspecs:
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yield name
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return
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argspec = self.argspecs[name]
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if argspec == []:
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yield name + '()'
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return
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argument_lists = [self.arguments_for[arg] for arg in argspec]
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arguments = [values[0] for values in argument_lists]
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yield self._format_arguments(name, arguments)
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# Dear Pylint, enumerate won't work here since we're modifying
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# the array.
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# pylint: disable=consider-using-enumerate
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for i in range(len(arguments)):
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for value in argument_lists[i][1:]:
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arguments[i] = value
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yield self._format_arguments(name, arguments)
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arguments[i] = argument_lists[0][0]
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except BaseException as e:
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raise Exception('distribute_arguments({})'.format(name)) from e
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def generate_expressions(self, names: Iterable[str]) -> Iterator[str]:
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"""Generate expressions covering values constructed from the given names.
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`names` can be any iterable collection of macro names.
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For example:
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* ``generate_expressions(['PSA_ALG_CMAC', 'PSA_ALG_HMAC'])``
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generates ``'PSA_ALG_CMAC'`` as well as ``'PSA_ALG_HMAC(h)'`` for
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every known hash algorithm ``h``.
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* ``macros.generate_expressions(macros.key_types)`` generates all
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key types.
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"""
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return itertools.chain(*map(self.distribute_arguments, names))
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class PSAMacroCollector:
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"""Collect PSA crypto macro definitions from C header files.
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"""
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def __init__(self, include_intermediate: bool = False) -> None:
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"""Set up an object to collect PSA macro definitions.
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Call the read_file method of the constructed object on each header file.
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* include_intermediate: if true, include intermediate macros such as
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PSA_XXX_BASE that do not designate semantic values.
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"""
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self.include_intermediate = include_intermediate
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self.statuses = set() #type: Set[str]
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self.key_types = set() #type: Set[str]
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self.key_types_from_curve = {} #type: Dict[str, str]
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self.key_types_from_group = {} #type: Dict[str, str]
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self.ecc_curves = set() #type: Set[str]
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self.dh_groups = set() #type: Set[str]
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self.algorithms = set() #type: Set[str]
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self.hash_algorithms = set() #type: Set[str]
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self.ka_algorithms = set() #type: Set[str]
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self.algorithms_from_hash = {} #type: Dict[str, str]
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self.key_usages = set() #type: Set[str]
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def is_internal_name(self, name: str) -> bool:
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"""Whether this is an internal macro. Internal macros will be skipped."""
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if not self.include_intermediate:
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if name.endswith('_BASE') or name.endswith('_NONE'):
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return True
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if '_CATEGORY_' in name:
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return True
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return name.endswith('_FLAG') or name.endswith('_MASK')
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# "#define" followed by a macro name with either no parameters
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# or a single parameter and a non-empty expansion.
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# Grab the macro name in group 1, the parameter name if any in group 2
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# and the expansion in group 3.
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_define_directive_re = re.compile(r'\s*#\s*define\s+(\w+)' +
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r'(?:\s+|\((\w+)\)\s*)' +
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r'(.+)')
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_deprecated_definition_re = re.compile(r'\s*MBEDTLS_DEPRECATED')
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def read_line(self, line):
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"""Parse a C header line and record the PSA identifier it defines if any.
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This function analyzes lines that start with "#define PSA_"
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(up to non-significant whitespace) and skips all non-matching lines.
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"""
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# pylint: disable=too-many-branches
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m = re.match(self._define_directive_re, line)
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if not m:
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return
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name, parameter, expansion = m.groups()
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expansion = re.sub(r'/\*.*?\*/|//.*', r' ', expansion)
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if re.match(self._deprecated_definition_re, expansion):
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# Skip deprecated values, which are assumed to be
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# backward compatibility aliases that share
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# numerical values with non-deprecated values.
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return
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if self.is_internal_name(name):
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# Macro only to build actual values
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return
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elif (name.startswith('PSA_ERROR_') or name == 'PSA_SUCCESS') \
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and not parameter:
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self.statuses.add(name)
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elif name.startswith('PSA_KEY_TYPE_') and not parameter:
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self.key_types.add(name)
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elif name.startswith('PSA_KEY_TYPE_') and parameter == 'curve':
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self.key_types_from_curve[name] = name[:13] + 'IS_' + name[13:]
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elif name.startswith('PSA_KEY_TYPE_') and parameter == 'group':
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self.key_types_from_group[name] = name[:13] + 'IS_' + name[13:]
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elif name.startswith('PSA_ECC_FAMILY_') and not parameter:
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self.ecc_curves.add(name)
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elif name.startswith('PSA_DH_FAMILY_') and not parameter:
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self.dh_groups.add(name)
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elif name.startswith('PSA_ALG_') and not parameter:
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if name in ['PSA_ALG_ECDSA_BASE',
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'PSA_ALG_RSA_PKCS1V15_SIGN_BASE']:
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# Ad hoc skipping of duplicate names for some numerical values
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return
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self.algorithms.add(name)
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# Ad hoc detection of hash algorithms
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if re.search(r'0x020000[0-9A-Fa-f]{2}', expansion):
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self.hash_algorithms.add(name)
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# Ad hoc detection of key agreement algorithms
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if re.search(r'0x09[0-9A-Fa-f]{2}0000', expansion):
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self.ka_algorithms.add(name)
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elif name.startswith('PSA_ALG_') and parameter == 'hash_alg':
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if name in ['PSA_ALG_DSA', 'PSA_ALG_ECDSA']:
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# A naming irregularity
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tester = name[:8] + 'IS_RANDOMIZED_' + name[8:]
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else:
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tester = name[:8] + 'IS_' + name[8:]
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self.algorithms_from_hash[name] = tester
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elif name.startswith('PSA_KEY_USAGE_') and not parameter:
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self.key_usages.add(name)
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else:
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# Other macro without parameter
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return
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_nonascii_re = re.compile(rb'[^\x00-\x7f]+')
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_continued_line_re = re.compile(rb'\\\r?\n\Z')
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def read_file(self, header_file):
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for line in header_file:
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m = re.search(self._continued_line_re, line)
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while m:
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cont = next(header_file)
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line = line[:m.start(0)] + cont
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m = re.search(self._continued_line_re, line)
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line = re.sub(self._nonascii_re, rb'', line).decode('ascii')
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self.read_line(line)
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