testing/go/keyset_service.go

// 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 services is implements gRPC services for testing_api.
package services

import (
	"bytes"
	"context"

	"github.com/google/tink/go/keyset"
	"github.com/google/tink/go/testkeyset"
	pb "github.com/google/tink/proto/testing/testing_api_go_grpc"
	tinkpb "github.com/google/tink/go/proto/tink_go_proto"

	"github.com/golang/protobuf/proto"
)

// KeysetService implements the Keyset testing service.
type KeysetService struct {
}

func (s *KeysetService) Generate(ctx context.Context, req *pb.KeysetGenerateRequest) (*pb.KeysetGenerateResponse, error) {
	template := &tinkpb.KeyTemplate{}
	err := proto.Unmarshal(req.Template, template)
	if err != nil {
		return &pb.KeysetGenerateResponse{
			Result: &pb.KeysetGenerateResponse_Err{err.Error()}}, nil
	}
	handle, err := keyset.NewHandle(template)
	if err != nil {
		return &pb.KeysetGenerateResponse{
			Result: &pb.KeysetGenerateResponse_Err{err.Error()}}, nil
	}
	buf := new(bytes.Buffer)
	writer := keyset.NewBinaryWriter(buf)
	err = testkeyset.Write(handle, writer)
	if err != nil {
		return &pb.KeysetGenerateResponse{
			Result: &pb.KeysetGenerateResponse_Err{err.Error()}}, nil
	}
	return &pb.KeysetGenerateResponse{
		Result: &pb.KeysetGenerateResponse_Keyset{buf.Bytes()}}, nil
}

func (s *KeysetService) Public(ctx context.Context, req *pb.KeysetPublicRequest) (*pb.KeysetPublicResponse, error) {
	reader := keyset.NewBinaryReader(bytes.NewReader(req.PrivateKeyset))
	privateHandle, err := testkeyset.Read(reader)
	if err != nil {
		return &pb.KeysetPublicResponse{
			Result: &pb.KeysetPublicResponse_Err{err.Error()}}, nil
	}
	publicHandle, err := privateHandle.Public()
	if err != nil {
		return &pb.KeysetPublicResponse{
			Result: &pb.KeysetPublicResponse_Err{err.Error()}}, nil
	}
	buf := new(bytes.Buffer)
	writer := keyset.NewBinaryWriter(buf)
	err = testkeyset.Write(publicHandle, writer)
	if err != nil {
		return &pb.KeysetPublicResponse{
			Result: &pb.KeysetPublicResponse_Err{err.Error()}}, nil
	}
	return &pb.KeysetPublicResponse{
		Result: &pb.KeysetPublicResponse_PublicKeyset{buf.Bytes()}}, nil
}

func (s *KeysetService) ToJson(ctx context.Context, req *pb.KeysetToJsonRequest) (*pb.KeysetToJsonResponse, error) {
	reader := keyset.NewBinaryReader(bytes.NewReader(req.Keyset))
	handle, err := testkeyset.Read(reader)
	if err != nil {
		return &pb.KeysetToJsonResponse{
			Result: &pb.KeysetToJsonResponse_Err{err.Error()}}, nil
	}
	buf := new(bytes.Buffer)
	writer := keyset.NewJSONWriter(buf)
	if err := testkeyset.Write(handle, writer); err != nil {
		return &pb.KeysetToJsonResponse{
			Result: &pb.KeysetToJsonResponse_Err{err.Error()}}, nil
	}
	return &pb.KeysetToJsonResponse{
		Result: &pb.KeysetToJsonResponse_JsonKeyset{buf.String()}}, nil
}

func (s *KeysetService) FromJson(ctx context.Context, req *pb.KeysetFromJsonRequest) (*pb.KeysetFromJsonResponse, error) {
	reader := keyset.NewJSONReader(bytes.NewBufferString(req.JsonKeyset))
	handle, err := testkeyset.Read(reader)
	if err != nil {
		return &pb.KeysetFromJsonResponse{
			Result: &pb.KeysetFromJsonResponse_Err{err.Error()}}, nil
	}
	buf := new(bytes.Buffer)
	writer := keyset.NewBinaryWriter(buf)
	if err := testkeyset.Write(handle, writer); err != nil {
		return &pb.KeysetFromJsonResponse{
			Result: &pb.KeysetFromJsonResponse_Err{err.Error()}}, nil
	}
	return &pb.KeysetFromJsonResponse{
		Result: &pb.KeysetFromJsonResponse_Keyset{buf.Bytes()}}, nil
}