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// Copyright 2022 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 streamingprf_test
import (
"crypto/sha256"
"crypto/sha512"
"testing"
commonpb "github.com/tink-crypto/tink-go/v2/proto/common_go_proto"
)
const hkdfPRFTypeURL = "type.googleapis.com/google.crypto.tink.HkdfPrfKey"
// limitFromHash returns the maximum output bytes from a HKDF using hash.
func limitFromHash(t *testing.T, hash commonpb.HashType) (limit int) {
t.Helper()
switch hash {
case commonpb.HashType_SHA256:
limit = sha256.Size * 255
case commonpb.HashType_SHA512:
limit = sha512.Size * 255
default:
t.Fatalf("unsupported hash type: %s", hash.String())
}
return
}
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