/
pem.go
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/
pem.go
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// Copyright 2021 Anapaya Systems
//
// 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 scrypto
import (
"bytes"
"encoding/pem"
"github.com/scionproto/scion/pkg/private/serrors"
)
// ParsePEMSymmetricKey parses the first PEM block in b and returns the data within.
//
// This provides a more idiomatic way of accessing errors (when compared with the
// pem.Decode function), and allows us to add more validation in the future (e.g.,
// if we want to make use of PEM headers).
func ParsePEMSymmetricKey(b []byte) ([]byte, error) {
block, _ := pem.Decode(b)
if block == nil {
return nil, serrors.New("parse error")
}
if len(block.Bytes) == 0 {
return nil, serrors.New("key not found")
}
return block.Bytes, nil
}
// EncodePEMSymmetricKey encodes the raw key in a PEM block with the SYMMETRIC KEY
// type.
func EncodePEMSymmetricKey(key []byte) ([]byte, error) {
block := &pem.Block{
Type: "SYMMETRIC KEY",
Bytes: key,
}
var buf bytes.Buffer
if err := pem.Encode(&buf, block); err != nil {
return nil, err
}
return buf.Bytes(), nil
}