238 lines
8 KiB
Python
Executable file
238 lines
8 KiB
Python
Executable file
#!/usr/bin/env python3
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"""Generate test data for bignum functions.
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With no arguments, generate all test data. With non-option arguments,
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generate only the specified files.
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Class structure:
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Child classes of test_generation.BaseTarget (file targets) represent an output
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file. These indicate where test cases will be written to, for all subclasses of
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this target. Multiple file targets should not reuse a `target_basename`.
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Each subclass derived from a file target can either be:
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- A concrete class, representing a test function, which generates test cases.
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- An abstract class containing shared methods and attributes, not associated
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with a test function. An example is BignumOperation, which provides
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common features used for bignum binary operations.
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Both concrete and abstract subclasses can be derived from, to implement
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additional test cases (see BignumCmp and BignumCmpAbs for examples of deriving
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from abstract and concrete classes).
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Adding test case generation for a function:
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A subclass representing the test function should be added, deriving from a
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file target such as BignumTarget. This test class must set/implement the
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following:
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- test_function: the function name from the associated .function file.
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- test_name: a descriptive name or brief summary to refer to the test
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function.
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- arguments(): a method to generate the list of arguments required for the
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test_function.
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- generate_function_tests(): a method to generate TestCases for the function.
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This should create instances of the class with required input data, and
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call `.create_test_case()` to yield the TestCase.
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Additional details and other attributes/methods are given in the documentation
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of BaseTarget in test_generation.py.
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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 sys
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import typing
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from abc import ABCMeta, abstractmethod
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from typing import Iterator, List, Tuple, TypeVar
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import scripts_path # pylint: disable=unused-import
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from mbedtls_dev import test_case
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from mbedtls_dev import test_generation
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T = TypeVar('T') #pylint: disable=invalid-name
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def hex_to_int(val: str) -> int:
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return int(val, 16) if val else 0
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def quote_str(val) -> str:
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return "\"{}\"".format(val)
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def combination_pairs(values: List[T]) -> List[Tuple[T, T]]:
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"""Return all pair combinations from input values.
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The return value is cast, as older versions of mypy are unable to derive
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the specific type returned by itertools.combinations_with_replacement.
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"""
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return typing.cast(
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List[Tuple[T, T]],
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list(itertools.combinations_with_replacement(values, 2))
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)
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class BignumTarget(test_generation.BaseTarget, metaclass=ABCMeta):
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#pylint: disable=abstract-method
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"""Target for bignum (mpi) test case generation."""
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target_basename = 'test_suite_mpi.generated'
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class BignumOperation(BignumTarget, metaclass=ABCMeta):
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"""Common features for bignum binary operations.
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This adds functionality common in binary operation tests. This includes
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generation of case descriptions, using descriptions of values and symbols
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to represent the operation or result.
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Attributes:
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symbol: Symbol used for the operation in case description.
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input_values: List of values to use as test case inputs. These are
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combined to produce pairs of values.
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input_cases: List of tuples containing pairs of test case inputs. This
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can be used to implement specific pairs of inputs.
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"""
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symbol = ""
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input_values = [
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"", "0", "7b", "-7b",
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"0000000000000000123", "-0000000000000000123",
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"1230000000000000000", "-1230000000000000000"
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] # type: List[str]
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input_cases = [] # type: List[Tuple[str, str]]
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def __init__(self, val_a: str, val_b: str) -> None:
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self.arg_a = val_a
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self.arg_b = val_b
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self.int_a = hex_to_int(val_a)
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self.int_b = hex_to_int(val_b)
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def arguments(self) -> List[str]:
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return [quote_str(self.arg_a), quote_str(self.arg_b), self.result()]
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def description(self) -> str:
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"""Generate a description for the test case.
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If not set, case_description uses the form A `symbol` B, where symbol
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is used to represent the operation. Descriptions of each value are
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generated to provide some context to the test case.
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"""
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if not self.case_description:
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self.case_description = "{} {} {}".format(
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self.value_description(self.arg_a),
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self.symbol,
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self.value_description(self.arg_b)
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)
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return super().description()
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@abstractmethod
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def result(self) -> str:
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"""Get the result of the operation.
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This could be calculated during initialization and stored as `_result`
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and then returned, or calculated when the method is called.
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"""
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raise NotImplementedError
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@staticmethod
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def value_description(val) -> str:
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"""Generate a description of the argument val.
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This produces a simple description of the value, which is used in test
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case naming to add context.
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"""
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if val == "":
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return "0 (null)"
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if val == "0":
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return "0 (1 limb)"
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if val[0] == "-":
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tmp = "negative"
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val = val[1:]
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else:
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tmp = "positive"
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if val[0] == "0":
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tmp += " with leading zero limb"
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elif len(val) > 10:
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tmp = "large " + tmp
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return tmp
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@classmethod
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def get_value_pairs(cls) -> Iterator[Tuple[str, str]]:
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"""Generator to yield pairs of inputs.
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Combinations are first generated from all input values, and then
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specific cases provided.
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"""
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yield from combination_pairs(cls.input_values)
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yield from cls.input_cases
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@classmethod
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def generate_function_tests(cls) -> Iterator[test_case.TestCase]:
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for a_value, b_value in cls.get_value_pairs():
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cur_op = cls(a_value, b_value)
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yield cur_op.create_test_case()
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class BignumCmp(BignumOperation):
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"""Test cases for bignum value comparison."""
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count = 0
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test_function = "mpi_cmp_mpi"
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test_name = "MPI compare"
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input_cases = [
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("-2", "-3"),
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("-2", "-2"),
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("2b4", "2b5"),
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("2b5", "2b6")
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]
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def __init__(self, val_a, val_b) -> None:
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super().__init__(val_a, val_b)
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self._result = int(self.int_a > self.int_b) - int(self.int_a < self.int_b)
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self.symbol = ["<", "==", ">"][self._result + 1]
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def result(self) -> str:
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return str(self._result)
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class BignumCmpAbs(BignumCmp):
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"""Test cases for absolute bignum value comparison."""
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count = 0
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test_function = "mpi_cmp_abs"
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test_name = "MPI compare (abs)"
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def __init__(self, val_a, val_b) -> None:
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super().__init__(val_a.strip("-"), val_b.strip("-"))
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class BignumAdd(BignumOperation):
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"""Test cases for bignum value addition."""
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count = 0
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symbol = "+"
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test_function = "mpi_add_mpi"
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test_name = "MPI add"
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input_cases = combination_pairs(
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[
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"1c67967269c6", "9cde3",
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"-1c67967269c6", "-9cde3",
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]
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)
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def result(self) -> str:
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return quote_str("{:x}".format(self.int_a + self.int_b))
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if __name__ == '__main__':
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# Use the section of the docstring relevant to the CLI as description
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test_generation.main(sys.argv[1:], "\n".join(__doc__.splitlines()[:4]))
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