| """Collect macro definitions from header files. |
| """ |
| |
| # Copyright The Mbed TLS Contributors |
| # SPDX-License-Identifier: Apache-2.0 |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); you may |
| # not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| import itertools |
| import re |
| from typing import Dict, Iterable, Iterator, List, Set |
| |
| |
| class PSAMacroEnumerator: |
| """Information about constructors of various PSA Crypto types. |
| |
| This includes macro names as well as information about their arguments |
| when applicable. |
| |
| This class only provides ways to enumerate expressions that evaluate to |
| values of the covered types. Derived classes are expected to populate |
| the set of known constructors of each kind, as well as populate |
| `self.arguments_for` for arguments that are not of a kind that is |
| enumerated here. |
| """ |
| |
| def __init__(self) -> None: |
| """Set up an empty set of known constructor macros. |
| """ |
| self.statuses = set() #type: Set[str] |
| self.algorithms = set() #type: Set[str] |
| self.ecc_curves = set() #type: Set[str] |
| self.dh_groups = set() #type: Set[str] |
| self.key_types = set() #type: Set[str] |
| self.key_usage_flags = set() #type: Set[str] |
| self.hash_algorithms = set() #type: Set[str] |
| self.mac_algorithms = set() #type: Set[str] |
| self.ka_algorithms = set() #type: Set[str] |
| self.kdf_algorithms = set() #type: Set[str] |
| self.aead_algorithms = set() #type: Set[str] |
| # macro name -> list of argument names |
| self.argspecs = {} #type: Dict[str, List[str]] |
| # argument name -> list of values |
| self.arguments_for = { |
| 'mac_length': [], |
| 'min_mac_length': [], |
| 'tag_length': [], |
| 'min_tag_length': [], |
| } #type: Dict[str, List[str]] |
| |
| def gather_arguments(self) -> None: |
| """Populate the list of values for macro arguments. |
| |
| Call this after parsing all the inputs. |
| """ |
| self.arguments_for['hash_alg'] = sorted(self.hash_algorithms) |
| self.arguments_for['mac_alg'] = sorted(self.mac_algorithms) |
| self.arguments_for['ka_alg'] = sorted(self.ka_algorithms) |
| self.arguments_for['kdf_alg'] = sorted(self.kdf_algorithms) |
| self.arguments_for['aead_alg'] = sorted(self.aead_algorithms) |
| self.arguments_for['curve'] = sorted(self.ecc_curves) |
| self.arguments_for['group'] = sorted(self.dh_groups) |
| |
| @staticmethod |
| def _format_arguments(name: str, arguments: Iterable[str]) -> str: |
| """Format a macro call with arguments..""" |
| return name + '(' + ', '.join(arguments) + ')' |
| |
| _argument_split_re = re.compile(r' *, *') |
| @classmethod |
| def _argument_split(cls, arguments: str) -> List[str]: |
| return re.split(cls._argument_split_re, arguments) |
| |
| def distribute_arguments(self, name: str) -> Iterator[str]: |
| """Generate macro calls with each tested argument set. |
| |
| If name is a macro without arguments, just yield "name". |
| If name is a macro with arguments, yield a series of |
| "name(arg1,...,argN)" where each argument takes each possible |
| value at least once. |
| """ |
| try: |
| if name not in self.argspecs: |
| yield name |
| return |
| argspec = self.argspecs[name] |
| if argspec == []: |
| yield name + '()' |
| return |
| argument_lists = [self.arguments_for[arg] for arg in argspec] |
| arguments = [values[0] for values in argument_lists] |
| yield self._format_arguments(name, arguments) |
| # Dear Pylint, enumerate won't work here since we're modifying |
| # the array. |
| # pylint: disable=consider-using-enumerate |
| for i in range(len(arguments)): |
| for value in argument_lists[i][1:]: |
| arguments[i] = value |
| yield self._format_arguments(name, arguments) |
| arguments[i] = argument_lists[0][0] |
| except BaseException as e: |
| raise Exception('distribute_arguments({})'.format(name)) from e |
| |
| def generate_expressions(self, names: Iterable[str]) -> Iterator[str]: |
| """Generate expressions covering values constructed from the given names. |
| |
| `names` can be any iterable collection of macro names. |
| |
| For example: |
| * ``generate_expressions(['PSA_ALG_CMAC', 'PSA_ALG_HMAC'])`` |
| generates ``'PSA_ALG_CMAC'`` as well as ``'PSA_ALG_HMAC(h)'`` for |
| every known hash algorithm ``h``. |
| * ``macros.generate_expressions(macros.key_types)`` generates all |
| key types. |
| """ |
| return itertools.chain(*map(self.distribute_arguments, names)) |
| |
| |
| class PSAMacroCollector(PSAMacroEnumerator): |
| """Collect PSA crypto macro definitions from C header files. |
| """ |
| |
| def __init__(self, include_intermediate: bool = False) -> None: |
| """Set up an object to collect PSA macro definitions. |
| |
| Call the read_file method of the constructed object on each header file. |
| |
| * include_intermediate: if true, include intermediate macros such as |
| PSA_XXX_BASE that do not designate semantic values. |
| """ |
| super().__init__() |
| self.include_intermediate = include_intermediate |
| self.key_types_from_curve = {} #type: Dict[str, str] |
| self.key_types_from_group = {} #type: Dict[str, str] |
| self.algorithms_from_hash = {} #type: Dict[str, str] |
| |
| def is_internal_name(self, name: str) -> bool: |
| """Whether this is an internal macro. Internal macros will be skipped.""" |
| if not self.include_intermediate: |
| if name.endswith('_BASE') or name.endswith('_NONE'): |
| return True |
| if '_CATEGORY_' in name: |
| return True |
| return name.endswith('_FLAG') or name.endswith('_MASK') |
| |
| def record_algorithm_subtype(self, name: str, expansion: str) -> None: |
| """Record the subtype of an algorithm constructor. |
| |
| Given a ``PSA_ALG_xxx`` macro name and its expansion, if the algorithm |
| is of a subtype that is tracked in its own set, add it to the relevant |
| set. |
| """ |
| # This code is very ad hoc and fragile. It should be replaced by |
| # something more robust. |
| if re.match(r'MAC(?:_|\Z)', name): |
| self.mac_algorithms.add(name) |
| elif re.match(r'KDF(?:_|\Z)', name): |
| self.kdf_algorithms.add(name) |
| elif re.search(r'0x020000[0-9A-Fa-f]{2}', expansion): |
| self.hash_algorithms.add(name) |
| elif re.search(r'0x03[0-9A-Fa-f]{6}', expansion): |
| self.mac_algorithms.add(name) |
| elif re.search(r'0x05[0-9A-Fa-f]{6}', expansion): |
| self.aead_algorithms.add(name) |
| elif re.search(r'0x09[0-9A-Fa-f]{2}0000', expansion): |
| self.ka_algorithms.add(name) |
| elif re.search(r'0x08[0-9A-Fa-f]{6}', expansion): |
| self.kdf_algorithms.add(name) |
| |
| # "#define" followed by a macro name with either no parameters |
| # or a single parameter and a non-empty expansion. |
| # Grab the macro name in group 1, the parameter name if any in group 2 |
| # and the expansion in group 3. |
| _define_directive_re = re.compile(r'\s*#\s*define\s+(\w+)' + |
| r'(?:\s+|\((\w+)\)\s*)' + |
| r'(.+)') |
| _deprecated_definition_re = re.compile(r'\s*MBEDTLS_DEPRECATED') |
| |
| def read_line(self, line): |
| """Parse a C header line and record the PSA identifier it defines if any. |
| This function analyzes lines that start with "#define PSA_" |
| (up to non-significant whitespace) and skips all non-matching lines. |
| """ |
| # pylint: disable=too-many-branches |
| m = re.match(self._define_directive_re, line) |
| if not m: |
| return |
| name, parameter, expansion = m.groups() |
| expansion = re.sub(r'/\*.*?\*/|//.*', r' ', expansion) |
| if parameter: |
| self.argspecs[name] = [parameter] |
| if re.match(self._deprecated_definition_re, expansion): |
| # Skip deprecated values, which are assumed to be |
| # backward compatibility aliases that share |
| # numerical values with non-deprecated values. |
| return |
| if self.is_internal_name(name): |
| # Macro only to build actual values |
| return |
| elif (name.startswith('PSA_ERROR_') or name == 'PSA_SUCCESS') \ |
| and not parameter: |
| self.statuses.add(name) |
| elif name.startswith('PSA_KEY_TYPE_') and not parameter: |
| self.key_types.add(name) |
| elif name.startswith('PSA_KEY_TYPE_') and parameter == 'curve': |
| self.key_types_from_curve[name] = name[:13] + 'IS_' + name[13:] |
| elif name.startswith('PSA_KEY_TYPE_') and parameter == 'group': |
| self.key_types_from_group[name] = name[:13] + 'IS_' + name[13:] |
| elif name.startswith('PSA_ECC_FAMILY_') and not parameter: |
| self.ecc_curves.add(name) |
| elif name.startswith('PSA_DH_FAMILY_') and not parameter: |
| self.dh_groups.add(name) |
| elif name.startswith('PSA_ALG_') and not parameter: |
| if name in ['PSA_ALG_ECDSA_BASE', |
| 'PSA_ALG_RSA_PKCS1V15_SIGN_BASE']: |
| # Ad hoc skipping of duplicate names for some numerical values |
| return |
| self.algorithms.add(name) |
| self.record_algorithm_subtype(name, expansion) |
| elif name.startswith('PSA_ALG_') and parameter == 'hash_alg': |
| if name in ['PSA_ALG_DSA', 'PSA_ALG_ECDSA']: |
| # A naming irregularity |
| tester = name[:8] + 'IS_RANDOMIZED_' + name[8:] |
| else: |
| tester = name[:8] + 'IS_' + name[8:] |
| self.algorithms_from_hash[name] = tester |
| elif name.startswith('PSA_KEY_USAGE_') and not parameter: |
| self.key_usage_flags.add(name) |
| else: |
| # Other macro without parameter |
| return |
| |
| _nonascii_re = re.compile(rb'[^\x00-\x7f]+') |
| _continued_line_re = re.compile(rb'\\\r?\n\Z') |
| def read_file(self, header_file): |
| for line in header_file: |
| m = re.search(self._continued_line_re, line) |
| while m: |
| cont = next(header_file) |
| line = line[:m.start(0)] + cont |
| m = re.search(self._continued_line_re, line) |
| line = re.sub(self._nonascii_re, rb'', line).decode('ascii') |
| self.read_line(line) |
