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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 insecurecleartextkeyset_test
// [START cleartext-keyset-example]
import (
"bytes"
"fmt"
"log"
"github.com/tink-crypto/tink-go/v2/aead"
"github.com/tink-crypto/tink-go/v2/insecurecleartextkeyset"
"github.com/tink-crypto/tink-go/v2/keyset"
)
func Example_cleartextKeysetInBinary() {
// Generate a new keyset handle for the primitive we want to use.
handle, err := keyset.NewHandle(aead.AES256GCMKeyTemplate())
if err != nil {
log.Fatal(err)
}
// Serialize the keyset.
buff := &bytes.Buffer{}
err = insecurecleartextkeyset.Write(handle, keyset.NewBinaryWriter(buff))
if err != nil {
log.Fatal(err)
}
serializedKeyset := buff.Bytes()
// serializedKeyset can now be stored at a secure location.
// WARNING: Storing the keyset in cleartext to disk is not recommended!
// Parse the keyset.
parsedHandle, err := insecurecleartextkeyset.Read(
keyset.NewBinaryReader(bytes.NewBuffer(serializedKeyset)))
if err != nil {
log.Fatal(err)
}
// Get the primitive.
primitive, err := aead.New(parsedHandle)
if err != nil {
log.Fatal(err)
}
// Use the primitive.
plaintext := []byte("message")
associatedData := []byte("example encryption")
ciphertext, err := primitive.Encrypt(plaintext, associatedData)
if err != nil {
log.Fatal(err)
}
decrypted, err := primitive.Decrypt(ciphertext, associatedData)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(decrypted))
// Output: message
}
// [END cleartext-keyset-example]
func Example_cleartextKeysetInJSON() {
// Generate a new keyset handle for the primitive we want to use.
handle, err := keyset.NewHandle(aead.AES256GCMKeyTemplate())
if err != nil {
log.Fatal(err)
}
// Serialize the keyset.
buff := &bytes.Buffer{}
err = insecurecleartextkeyset.Write(handle, keyset.NewJSONWriter(buff))
if err != nil {
log.Fatal(err)
}
serializedKeyset := buff.Bytes()
// serializedKeyset can now be stored at a secure location.
// WARNING: Storing the keyset in cleartext to disk is not recommended!
// Parse the keyset.
parsedHandle, err := insecurecleartextkeyset.Read(keyset.NewJSONReader(bytes.NewBuffer(serializedKeyset)))
if err != nil {
log.Fatal(err)
}
// Get the primitive.
primitive, err := aead.New(parsedHandle)
if err != nil {
log.Fatal(err)
}
// Use the primitive.
plaintext := []byte("message")
associatedData := []byte("example encryption")
ciphertext, err := primitive.Encrypt(plaintext, associatedData)
if err != nil {
log.Fatal(err)
}
decrypted, err := primitive.Decrypt(ciphertext, associatedData)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(decrypted))
// Output: message
}
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