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 2025 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 rawHybridEncryptied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ecies
import (
"fmt"
"slices"
"github.com/tink-crypto/tink-go/v2/internal/internalapi"
"github.com/tink-crypto/tink-go/v2/internal/protoserialization"
"github.com/tink-crypto/tink-go/v2/key"
"github.com/tink-crypto/tink-go/v2/tink"
)
type hybridEncrypt struct {
rawHybridEncrypt tink.HybridEncrypt
prefix []byte
variant Variant
}
// NewHybridEncrypt creates a new instance of [tink.HybridEncrypt] from a
// [PublicKey].
//
// This is an internal API.
func NewHybridEncrypt(publicKey *PublicKey, _ internalapi.Token) (tink.HybridEncrypt, error) {
serializedPublicKey, err := protoserialization.SerializeKey(publicKey)
if err != nil {
return nil, err
}
rawHybridEncrypt, err := (&publicKeyKeyManager{}).Primitive(serializedPublicKey.KeyData().GetValue())
if err != nil {
return nil, err
}
return &hybridEncrypt{
rawHybridEncrypt: rawHybridEncrypt.(tink.HybridEncrypt),
prefix: publicKey.OutputPrefix(),
variant: publicKey.Parameters().(*Parameters).Variant(),
}, nil
}
func (e *hybridEncrypt) Encrypt(plaintext, contextInfo []byte) ([]byte, error) {
rawCiphertext, err := e.rawHybridEncrypt.Encrypt(plaintext, contextInfo)
if err != nil {
return nil, err
}
return slices.Concat(e.prefix, rawCiphertext), nil
}
func hybridEncryptConstructor(k key.Key) (any, error) {
that, ok := k.(*PublicKey)
if !ok {
return nil, fmt.Errorf("invalid key type, got %T, want %T", k, (*PublicKey)(nil))
}
return NewHybridEncrypt(that, internalapi.Token{})
}
|
