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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
// Copyright 2024 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.
// Package keygenregistry is a registry for key creators.
package keygenregistry
import (
"fmt"
"reflect"
"sync"
"github.com/tink-crypto/tink-go/v2/key"
)
type keyCreator = func(p key.Parameters, idRequirement uint32) (key.Key, error)
var (
keyCreatorsMutex sync.RWMutex
keyCreators = make(map[reflect.Type]keyCreator)
)
// RegisterKeyCreator registers a function that creates a key from
// the given [key.Parameters].
//
// Returns an error if a creator for parametersType is already registered (no
// matter whether it's the same object or different, since constructors are of
// type [Func] and they are never considered equal in Go unless they are nil).
func RegisterKeyCreator[P key.Parameters](creator func(p key.Parameters, idRequirement uint32) (key.Key, error)) error {
defer keyCreatorsMutex.Unlock()
keyCreatorsMutex.Lock()
parametersType := reflect.TypeFor[P]()
if _, found := keyCreators[parametersType]; found {
return fmt.Errorf("a different key creator already registered for %v", parametersType)
}
keyCreators[parametersType] = creator
return nil
}
// CreateKey creates a key from the given [key.Parameters] using the registry.
func CreateKey(p key.Parameters, idRequirement uint32) (key.Key, error) {
creator, found := keyCreators[reflect.TypeOf(p)]
if !found {
return nil, fmt.Errorf("no creator found for parameters %T", p)
}
return creator(p, idRequirement)
}
// UnregisterKeyCreator unregisters a key creator for the given parametersType.
//
// This is for testing only.
func UnregisterKeyCreator[P key.Parameters]() {
defer keyCreatorsMutex.Unlock()
keyCreatorsMutex.Lock()
parametersType := reflect.TypeFor[P]()
delete(keyCreators, parametersType)
}
|
