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// Copyright 2020 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 prf_test
import (
"encoding/base64"
"fmt"
"log"
"github.com/tink-crypto/tink-go/v2/keyset"
"github.com/tink-crypto/tink-go/v2/prf"
)
func Example() {
kh, err := keyset.NewHandle(prf.HMACSHA256PRFKeyTemplate())
if err != nil {
log.Fatal(err)
}
// TODO: save the keyset to a safe location. DO NOT hardcode it in source code.
// Consider encrypting it with a remote key in Cloud KMS, AWS KMS or HashiCorp Vault.
// See https://github.com/google/tink/blob/master/docs/GOLANG-HOWTO.md#storing-and-loading-existing-keysets.
ps, err := prf.NewPRFSet(kh)
if err != nil {
log.Fatal(err)
}
msg := []byte("This is an ID needs to be redacted")
output, err := ps.ComputePrimaryPRF(msg, 16)
fmt.Printf("Message: %s\n", msg)
fmt.Printf("Redacted: %s\n", base64.StdEncoding.EncodeToString(output))
}
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