| """Knowledge about cryptographic mechanisms implemented in Mbed TLS. |
| |
| This module is entirely based on the PSA API. |
| """ |
| |
| # 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 re |
| from typing import List, Optional |
| |
| class KeyType: |
| """Knowledge about a PSA key type.""" |
| |
| def __init__(self, name: str, params: Optional[List[str]] = None): |
| """Analyze a key type. |
| |
| The key type must be specified in PSA syntax. In its simplest form, |
| this is a string 'PSA_KEY_TYPE_xxx' which is the name of a PSA key |
| type macro. For key types that take arguments, the arguments can |
| be passed either through the optional argument `params` or by |
| passing an expression of the form 'PSA_KEY_TYPE_xxx(param1, param2)' |
| as the a string. |
| """ |
| self.name = name.strip() |
| if params is None: |
| if '(' in self.name: |
| m = re.match(r'(\w+)\s*\((.*)\)\Z', self.name) |
| assert m is not None |
| self.name = m.group(1) |
| params = ','.split(m.group(2)) |
| if params is None: |
| self.params = params |
| else: |
| self.params = [param.strip() for param in params] |
| self.expression = self.name |
| if self.params is not None: |
| self.expression += '(' + ', '.join(self.params) + ')' |
| self.private_type = re.sub(r'_PUBLIC_KEY\Z', r'_KEY_PAIR', self.name) |
