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// Copyright 2024 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 aesgcmsiv provides an implementation of AES-GCM-SIV.
//
// See https://www.rfc-editor.org/rfc/rfc8452.html for more information.
package aesgcmsiv
import (
"fmt"
"reflect"
"google.golang.org/protobuf/proto"
"github.com/tink-crypto/tink-go/v2/core/registry"
"github.com/tink-crypto/tink-go/v2/internal/internalapi"
"github.com/tink-crypto/tink-go/v2/internal/keygenregistry"
"github.com/tink-crypto/tink-go/v2/internal/legacykeymanager"
"github.com/tink-crypto/tink-go/v2/internal/primitiveregistry"
"github.com/tink-crypto/tink-go/v2/internal/protoserialization"
"github.com/tink-crypto/tink-go/v2/internal/registryconfig"
"github.com/tink-crypto/tink-go/v2/key"
aesgcmsivpb "github.com/tink-crypto/tink-go/v2/proto/aes_gcm_siv_go_proto"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
type config interface {
RegisterPrimitiveConstructor(keyType reflect.Type, primitiveConstructor func(key key.Key) (any, error), t internalapi.Token) error
RegisterKeyManager(keyTypeURL string, km registry.KeyManager, t internalapi.Token) error
}
func newKeyManager() registry.KeyManager {
return legacykeymanager.New(typeURL, ®istryconfig.RegistryConfig{}, tinkpb.KeyData_SYMMETRIC, func(b []byte) (proto.Message, error) {
protoKey := &aesgcmsivpb.AesGcmSivKey{}
if err := proto.Unmarshal(b, protoKey); err != nil {
return nil, err
}
return protoKey, nil
})
}
// RegisterKeyManager accepts a config object and registers an
// instance of an AES-GCM-SIV AEAD KeyManager to the provided config.
//
// It is *NOT* part of the public API.
func RegisterKeyManager(c config, t internalapi.Token) error {
return c.RegisterKeyManager(typeURL, newKeyManager(), t)
}
// RegisterPrimitiveConstructor accepts a config object and registers the
// AES-GCM-SIV AEAD primitive constructor to the provided config.
//
// It is *NOT* part of the public API.
func RegisterPrimitiveConstructor(c config, t internalapi.Token) error {
return c.RegisterPrimitiveConstructor(reflect.TypeFor[*Key](), primitiveConstructor, t)
}
func init() {
if err := registry.RegisterKeyManager(newKeyManager()); err != nil {
panic(fmt.Sprintf("aesgcmsiv.init() failed: %v", err))
}
if err := protoserialization.RegisterKeySerializer[*Key](&keySerializer{}); err != nil {
panic(fmt.Sprintf("aesgcmsiv.init() failed: %v", err))
}
if err := protoserialization.RegisterKeyParser(typeURL, &keyParser{}); err != nil {
panic(fmt.Sprintf("aesgcmsiv.init() failed: %v", err))
}
if err := protoserialization.RegisterParametersSerializer[*Parameters](¶metersSerializer{}); err != nil {
panic(fmt.Sprintf("aesgcmsiv.init() failed: %v", err))
}
if err := protoserialization.RegisterParametersParser(typeURL, ¶metersParser{}); err != nil {
panic(fmt.Sprintf("aesgcmsiv.init() failed: %v", err))
}
if err := primitiveregistry.RegisterPrimitiveConstructor[*Key](primitiveConstructor); err != nil {
panic(fmt.Sprintf("aesgcmsiv.init() failed: %v", err))
}
if err := keygenregistry.RegisterKeyCreator[*Parameters](createKey); err != nil {
panic(fmt.Sprintf("aesgcmsiv.init() failed: %v", err))
}
}
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