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// Copyright 2016 CoreOS, 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 types
import (
"crypto"
"encoding/hex"
"errors"
"strings"
"github.com/coreos/ignition/config/validate/report"
)
var (
ErrHashMalformed = errors.New("malformed hash specifier")
ErrHashWrongSize = errors.New("incorrect size for hash sum")
ErrHashUnrecognized = errors.New("unrecognized hash function")
)
// HashParts will return the sum and function (in that order) of the hash stored
// in this Verification, or an error if there is an issue during parsing.
func (v Verification) HashParts() (string, string, error) {
if v.Hash == nil {
// The hash can be nil
return "", "", nil
}
parts := strings.SplitN(*v.Hash, "-", 2)
if len(parts) != 2 {
return "", "", ErrHashMalformed
}
return parts[0], parts[1], nil
}
func (v Verification) Validate() report.Report {
r := report.Report{}
if v.Hash == nil {
// The hash can be nil
return r
}
function, sum, err := v.HashParts()
if err != nil {
r.Add(report.Entry{
Message: err.Error(),
Kind: report.EntryError,
})
return r
}
var hash crypto.Hash
switch function {
case "sha512":
hash = crypto.SHA512
default:
r.Add(report.Entry{
Message: ErrHashUnrecognized.Error(),
Kind: report.EntryError,
})
return r
}
if len(sum) != hex.EncodedLen(hash.Size()) {
r.Add(report.Entry{
Message: ErrHashWrongSize.Error(),
Kind: report.EntryError,
})
}
return r
}
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