blob: 50af285253d7829c8707bf2ae9db99808d8fe279 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
// Copyright 2019 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.
//
////////////////////////////////////////////////////////////////////////////////
#ifndef TINK_KEYDERIVATION_KEY_DERIVATION_KEY_TEMPLATES_H_
#define TINK_KEYDERIVATION_KEY_DERIVATION_KEY_TEMPLATES_H_
#include "tink/util/statusor.h"
#include "proto/tink.pb.h"
namespace crypto {
namespace tink {
///////////////////////////////////////////////////////////////////////////////
// Methods to generate KeyTemplates for key derivation.
class KeyDerivationKeyTemplates {
public:
// Creates a key template for key derivation that uses a PRF to derive a key
// that adheres to `derived_key_template`. The following must be true:
// (1) `prf_key_template` is a PRF key template, i.e.
// `keyset_handle->GetPrimitive<StreamingPrf>()` works.
// (2) `derived_key_template` describes a key type that supports derivation.
//
// The output prefix type of the derived key will match the output prefix type
// of `derived_key_template`.
//
// This function verifies the newly created key template by creating a
// KeysetDeriver primitive from it. This requires both the `prf_key_template`
// and `derived_key_template` key types to be in the registry. It also
// attempts to derive a key, returning an error on failure.
static util::StatusOr<google::crypto::tink::KeyTemplate>
CreatePrfBasedKeyTemplate(
const google::crypto::tink::KeyTemplate& prf_key_template,
const google::crypto::tink::KeyTemplate& derived_key_template);
};
} // namespace tink
} // namespace crypto
#endif // TINK_KEYDERIVATION_KEY_DERIVATION_KEY_TEMPLATES_H_
|
