minio/cmd/crypto/parse.go

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// MinIO Cloud Storage, (C) 2017-2019 MinIO, Inc.
//
// 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 crypto
import (
"encoding/hex"
"fmt"
"strings"
)
// ParseMasterKey parses the value of the environment variable
// `EnvKMSMasterKey` and returns a key-ID and a master-key KMS on success.
func ParseMasterKey(envArg string) (KMS, error) {
values := strings.SplitN(envArg, ":", 2)
if len(values) != 2 {
return nil, fmt.Errorf("Invalid KMS master key: %s does not contain a ':'", envArg)
}
var (
keyID = values[0]
hexKey = values[1]
)
if len(hexKey) != 64 { // 2 hex bytes = 1 byte
return nil, fmt.Errorf("Invalid KMS master key: %s not a 32 bytes long HEX value", hexKey)
}
var masterKey [32]byte
if _, err := hex.Decode(masterKey[:], []byte(hexKey)); err != nil {
return nil, err
}
return NewMasterKey(keyID, masterKey), nil
}