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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 internalregistry
import (
"io"
"google.golang.org/protobuf/proto"
"github.com/tink-crypto/tink-go/v2/core/registry"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
// DerivableKeyManager is a special type of KeyManager that can derive new keys.
type DerivableKeyManager interface {
registry.KeyManager
// KeyMaterialType returns the key material type of the key manager.
KeyMaterialType() tinkpb.KeyData_KeyMaterialType
// DeriveKey derives a new key from serializedKeyFormat and pseudorandomness.
//
// Note: The given parameter pseudorandomness may only produce a finite amount
// of randomness. Implementions must obtain the pseudorandom bytes needed
// before producing the key.
DeriveKey(serializedKeyFormat []byte, pseudorandomness io.Reader) (proto.Message, error)
}
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