/
key_factory.go
78 lines (68 loc) · 1.92 KB
/
key_factory.go
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// Copyright 2021 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 fakekms
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"embed"
"encoding/pem"
"errors"
"fmt"
)
//go:embed testdata/*.pem
var testdata embed.FS
type keyFactory interface {
Generate() interface{}
// TODO(bdhess): implement for import
// Parse([]byte) (interface{}, error)
}
type ecKeyFactory struct {
curve elliptic.Curve
}
func (f *ecKeyFactory) Generate() interface{} {
k, err := ecdsa.GenerateKey(f.curve, rand.Reader)
if err != nil {
panic(err) // we ran out of entropy
}
return k
}
type rsaKeyFactory int
func (f rsaKeyFactory) Generate() interface{} {
key, err := func() (*rsa.PrivateKey, error) {
pemKey, err := testdata.ReadFile(fmt.Sprintf("testdata/rsa_%d_private.pem", f))
if err != nil {
return nil, fmt.Errorf("unsupported RSA key size: %d", f)
}
block, _ := pem.Decode(pemKey)
if block == nil || block.Type != "RSA PRIVATE KEY" {
return nil, errors.New("failed to decode PEM block containing RSA private key")
}
return x509.ParsePKCS1PrivateKey(block.Bytes)
}()
if err != nil {
panic("error loading pregenerated RSA private key: " + err.Error())
}
return key
}
type symmetricKeyFactory int
func (f symmetricKeyFactory) Generate() interface{} {
k := make([]byte, int(f)/8)
if _, err := rand.Read(k); err != nil {
panic(err) // we ran out of entropy
}
return k
}