| # Copyright 2020 Google LLC. |
| # |
| # 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. |
| """Pre-generated KeyTemplate for Mac. |
| |
| One can use these templates to generate a new tink_pb2.Keyset with |
| tink_pb2.KeysetHandle. To generate a new keyset that contains a single |
| hmac_pb2.HmacKey, one can do: |
| handle = keyset_handle.KeysetHandle(mac_key_templates.HMAC_SHA256_128BITTAG). |
| """ |
| |
| from __future__ import absolute_import |
| from __future__ import division |
| # Placeholder for import for type annotations |
| from __future__ import print_function |
| |
| from tink.proto import aes_cmac_pb2 |
| from tink.proto import common_pb2 |
| from tink.proto import hmac_pb2 |
| from tink.proto import tink_pb2 |
| |
| |
| def create_hmac_key_template( |
| key_size: int, tag_size: int, |
| hash_type: common_pb2.HashType) -> tink_pb2.KeyTemplate: |
| """Creates a HMAC KeyTemplate, and fills in its values.""" |
| key_format = hmac_pb2.HmacKeyFormat() |
| key_format.params.hash = hash_type |
| key_format.params.tag_size = tag_size |
| key_format.key_size = key_size |
| key_template = tink_pb2.KeyTemplate() |
| key_template.value = key_format.SerializeToString() |
| key_template.type_url = 'type.googleapis.com/google.crypto.tink.HmacKey' |
| key_template.output_prefix_type = tink_pb2.TINK |
| return key_template |
| |
| |
| def create_aes_cmac_key_template( |
| key_size: int, tag_size: int) -> tink_pb2.KeyTemplate: |
| """"Creates an AES-CMAC KeyTemplate, and fills in its values.""" |
| key_format = aes_cmac_pb2.AesCmacKeyFormat() |
| key_format.key_size = key_size |
| key_format.params.tag_size = tag_size |
| key_template = tink_pb2.KeyTemplate() |
| key_template.value = key_format.SerializeToString() |
| key_template.type_url = 'type.googleapis.com/google.crypto.tink.AesCmacKey' |
| key_template.output_prefix_type = tink_pb2.TINK |
| return key_template |
| |
| |
| AES_CMAC = create_aes_cmac_key_template(key_size=32, tag_size=16) |
| HMAC_SHA256_128BITTAG = create_hmac_key_template( |
| key_size=32, tag_size=16, hash_type=common_pb2.SHA256) |
| HMAC_SHA256_256BITTAG = create_hmac_key_template( |
| key_size=32, tag_size=32, hash_type=common_pb2.SHA256) |
| HMAC_SHA512_256BITTAG = create_hmac_key_template( |
| key_size=64, tag_size=32, hash_type=common_pb2.SHA512) |
| HMAC_SHA512_512BITTAG = create_hmac_key_template( |
| key_size=64, tag_size=64, hash_type=common_pb2.SHA512) |