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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 keygenconfig provides internal implementation of keygen configs.
package keygenconfig
import (
"fmt"
"reflect"
"github.com/tink-crypto/tink-go/v2/key"
)
// Config keeps a collection of functions that create keys from
// [key.Primitive].
type Config struct {
keyCreators map[reflect.Type]func(p key.Parameters, idRequirement uint32) (key.Key, error)
}
// New creates an empty [Config].
func New() *Config {
return &Config{
keyCreators: map[reflect.Type]func(p key.Parameters, idRequirement uint32) (key.Key, error){},
}
}
// RegisterKeyCreator registers a function that creates a key from
// the given [key.Parameters].
// Not thread-safe.
//
// Returns an error if a creator for parametersType is already registered (no
// matter whether it's the same object or different, since constructors are of
// type [Func] and they are never considered equal in Go unless they are nil).
//
// This is an internal API.
func (c *Config) RegisterKeyCreator(parametersType reflect.Type, creator func(p key.Parameters, idRequirement uint32) (key.Key, error)) error {
if _, found := c.keyCreators[parametersType]; found {
return fmt.Errorf("a different key creator already registered for %v", parametersType)
}
c.keyCreators[parametersType] = creator
return nil
}
// CreateKey creates a key from the given [key.Parameters] using the registry.
//
// Not thread-safe.
//
// This is an internal API.
func (c *Config) CreateKey(p key.Parameters, idRequirement uint32) (key.Key, error) {
creator, found := c.keyCreators[reflect.TypeOf(p)]
if !found {
return nil, fmt.Errorf("no creator found for parameters %T", p)
}
return creator(p, idRequirement)
}
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