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// Copyright 2023 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 keyderivation_test
import (
"fmt"
"log"
"github.com/tink-crypto/tink-go/v2/aead"
"github.com/tink-crypto/tink-go/v2/keyderivation"
"github.com/tink-crypto/tink-go/v2/keyset"
"github.com/tink-crypto/tink-go/v2/prf"
)
func Example() {
template, err := keyderivation.CreatePRFBasedKeyTemplate(prf.HKDFSHA256PRFKeyTemplate(), aead.AES128GCMKeyTemplate())
if err != nil {
log.Fatal(err)
}
handle, err := keyset.NewHandle(template)
if err != nil {
log.Fatal(err)
}
deriver, err := keyderivation.New(handle)
if err != nil {
log.Fatal(err)
}
derivedHandle, err := deriver.DeriveKeyset([]byte("salt"))
if err != nil {
log.Fatal(err)
}
// Use the derived keyset.
a, err := aead.New(derivedHandle)
if err != nil {
log.Fatal(err)
}
ciphertext, err := a.Encrypt([]byte("a secret message"), nil)
if err != nil {
log.Fatal(err)
}
plaintext, err := a.Decrypt(ciphertext, nil)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(plaintext))
// Output: a secret message
}
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