151 lines
6.1 KiB
Python
151 lines
6.1 KiB
Python
"""Collect information about PSA cryptographic mechanisms.
|
|
"""
|
|
|
|
# Copyright The Mbed TLS Contributors
|
|
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
|
|
#
|
|
|
|
import re
|
|
from typing import Dict, FrozenSet, List, Optional
|
|
|
|
from . import macro_collector
|
|
|
|
|
|
class Information:
|
|
"""Gather information about PSA constructors."""
|
|
|
|
def __init__(self) -> None:
|
|
self.constructors = self.read_psa_interface()
|
|
|
|
@staticmethod
|
|
def remove_unwanted_macros(
|
|
constructors: macro_collector.PSAMacroEnumerator
|
|
) -> None:
|
|
# Mbed TLS does not support finite-field DSA.
|
|
# Don't attempt to generate any related test case.
|
|
constructors.key_types.discard('PSA_KEY_TYPE_DSA_KEY_PAIR')
|
|
constructors.key_types.discard('PSA_KEY_TYPE_DSA_PUBLIC_KEY')
|
|
|
|
def read_psa_interface(self) -> macro_collector.PSAMacroEnumerator:
|
|
"""Return the list of known key types, algorithms, etc."""
|
|
constructors = macro_collector.InputsForTest()
|
|
header_file_names = ['include/psa/crypto_values.h',
|
|
'include/psa/crypto_extra.h']
|
|
test_suites = ['tests/suites/test_suite_psa_crypto_metadata.data']
|
|
for header_file_name in header_file_names:
|
|
constructors.parse_header(header_file_name)
|
|
for test_cases in test_suites:
|
|
constructors.parse_test_cases(test_cases)
|
|
self.remove_unwanted_macros(constructors)
|
|
constructors.gather_arguments()
|
|
return constructors
|
|
|
|
|
|
def psa_want_symbol(name: str) -> str:
|
|
"""Return the PSA_WANT_xxx symbol associated with a PSA crypto feature."""
|
|
if name.startswith('PSA_'):
|
|
return name[:4] + 'WANT_' + name[4:]
|
|
else:
|
|
raise ValueError('Unable to determine the PSA_WANT_ symbol for ' + name)
|
|
|
|
def finish_family_dependency(dep: str, bits: int) -> str:
|
|
"""Finish dep if it's a family dependency symbol prefix.
|
|
|
|
A family dependency symbol prefix is a PSA_WANT_ symbol that needs to be
|
|
qualified by the key size. If dep is such a symbol, finish it by adjusting
|
|
the prefix and appending the key size. Other symbols are left unchanged.
|
|
"""
|
|
return re.sub(r'_FAMILY_(.*)', r'_\1_' + str(bits), dep)
|
|
|
|
def finish_family_dependencies(dependencies: List[str], bits: int) -> List[str]:
|
|
"""Finish any family dependency symbol prefixes.
|
|
|
|
Apply `finish_family_dependency` to each element of `dependencies`.
|
|
"""
|
|
return [finish_family_dependency(dep, bits) for dep in dependencies]
|
|
|
|
SYMBOLS_WITHOUT_DEPENDENCY = frozenset([
|
|
'PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG', # modifier, only in policies
|
|
'PSA_ALG_AEAD_WITH_SHORTENED_TAG', # modifier
|
|
'PSA_ALG_ANY_HASH', # only in policies
|
|
'PSA_ALG_AT_LEAST_THIS_LENGTH_MAC', # modifier, only in policies
|
|
'PSA_ALG_KEY_AGREEMENT', # chaining
|
|
'PSA_ALG_TRUNCATED_MAC', # modifier
|
|
])
|
|
def automatic_dependencies(*expressions: str) -> List[str]:
|
|
"""Infer dependencies of a test case by looking for PSA_xxx symbols.
|
|
|
|
The arguments are strings which should be C expressions. Do not use
|
|
string literals or comments as this function is not smart enough to
|
|
skip them.
|
|
"""
|
|
used = set()
|
|
for expr in expressions:
|
|
used.update(re.findall(r'PSA_(?:ALG|ECC_FAMILY|KEY_TYPE)_\w+', expr))
|
|
used.difference_update(SYMBOLS_WITHOUT_DEPENDENCY)
|
|
return sorted(psa_want_symbol(name) for name in used)
|
|
|
|
# Define set of regular expressions and dependencies to optionally append
|
|
# extra dependencies for test case.
|
|
AES_128BIT_ONLY_DEP_REGEX = r'AES\s(192|256)'
|
|
AES_128BIT_ONLY_DEP = ["!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH"]
|
|
|
|
DEPENDENCY_FROM_KEY = {
|
|
AES_128BIT_ONLY_DEP_REGEX: AES_128BIT_ONLY_DEP
|
|
}#type: Dict[str, List[str]]
|
|
def generate_key_dependencies(description: str) -> List[str]:
|
|
"""Return additional dependencies based on pairs of REGEX and dependencies.
|
|
"""
|
|
deps = []
|
|
for regex, dep in DEPENDENCY_FROM_KEY.items():
|
|
if re.search(regex, description):
|
|
deps += dep
|
|
|
|
return deps
|
|
|
|
# A temporary hack: at the time of writing, not all dependency symbols
|
|
# are implemented yet. Skip test cases for which the dependency symbols are
|
|
# not available. Once all dependency symbols are available, this hack must
|
|
# be removed so that a bug in the dependency symbols properly leads to a test
|
|
# failure.
|
|
def read_implemented_dependencies(filename: str) -> FrozenSet[str]:
|
|
return frozenset(symbol
|
|
for line in open(filename)
|
|
for symbol in re.findall(r'\bPSA_WANT_\w+\b', line))
|
|
_implemented_dependencies = None #type: Optional[FrozenSet[str]] #pylint: disable=invalid-name
|
|
def hack_dependencies_not_implemented(dependencies: List[str]) -> None:
|
|
global _implemented_dependencies #pylint: disable=global-statement,invalid-name
|
|
if _implemented_dependencies is None:
|
|
_implemented_dependencies = \
|
|
read_implemented_dependencies('include/psa/crypto_config.h')
|
|
if not all((dep.lstrip('!') in _implemented_dependencies or
|
|
not dep.lstrip('!').startswith('PSA_WANT'))
|
|
for dep in dependencies):
|
|
dependencies.append('DEPENDENCY_NOT_IMPLEMENTED_YET')
|
|
|
|
def tweak_key_pair_dependency(dep: str, usage: str):
|
|
"""
|
|
This helper function add the proper suffix to PSA_WANT_KEY_TYPE_xxx_KEY_PAIR
|
|
symbols according to the required usage.
|
|
"""
|
|
ret_list = list()
|
|
if dep.endswith('KEY_PAIR'):
|
|
if usage == "BASIC":
|
|
# BASIC automatically includes IMPORT and EXPORT for test purposes (see
|
|
# config_psa.h).
|
|
ret_list.append(re.sub(r'KEY_PAIR', r'KEY_PAIR_BASIC', dep))
|
|
ret_list.append(re.sub(r'KEY_PAIR', r'KEY_PAIR_IMPORT', dep))
|
|
ret_list.append(re.sub(r'KEY_PAIR', r'KEY_PAIR_EXPORT', dep))
|
|
elif usage == "GENERATE":
|
|
ret_list.append(re.sub(r'KEY_PAIR', r'KEY_PAIR_GENERATE', dep))
|
|
else:
|
|
# No replacement to do in this case
|
|
ret_list.append(dep)
|
|
return ret_list
|
|
|
|
def fix_key_pair_dependencies(dep_list: List[str], usage: str):
|
|
new_list = [new_deps
|
|
for dep in dep_list
|
|
for new_deps in tweak_key_pair_dependency(dep, usage)]
|
|
|
|
return new_list
|