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sciond_drkey.go
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sciond_drkey.go
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// Copyright 2020 ETH Zurich
//
// 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 mockupsciond
import (
"context"
"fmt"
"time"
"github.com/scionproto/scion/go/lib/addr"
"github.com/scionproto/scion/go/lib/common"
"github.com/JordiSubira/drkeymockup/drkey"
"github.com/JordiSubira/drkeymockup/drkey/protocol"
)
const keyDuration = time.Hour * 24
// DRKeyGetLvl2Key mocks retrieving Lvl2Key operation for SCIOND API
func DRKeyGetLvl2Key(_ context.Context, meta drkey.Lvl2Meta, valTime uint32) (drkey.Lvl2Key, error) {
lvl1Key, err := getLvl1(meta.SrcIA, meta.DstIA, valTime)
if err != nil {
return drkey.Lvl2Key{}, common.NewBasicError("Error getting lvl1 key", err)
}
derProt, found := protocol.KnownDerivations[meta.Protocol]
if !found {
return drkey.Lvl2Key{}, fmt.Errorf("No derivation found for protocol \"%s\"", meta.Protocol)
}
return derProt.DeriveLvl2(meta, lvl1Key)
}
func getLvl1(srcIA, dstIA addr.IA, valTime uint32) (drkey.Lvl1Key, error) {
validSince := uint32(time.Unix(int64(valTime), 0).Truncate(keyDuration).Unix())
duration := uint32(keyDuration / time.Second)
epoch := drkey.NewEpoch(validSince, validSince+duration)
meta := drkey.SVMeta{
Epoch: epoch,
}
asSecret := []byte{0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7}
sv, err := drkey.DeriveSV(meta, asSecret)
if err != nil {
return drkey.Lvl1Key{}, common.NewBasicError("Error getting secret value", err)
}
lvl1, err := protocol.DeriveLvl1(drkey.Lvl1Meta{
Epoch: epoch,
SrcIA: srcIA,
DstIA: dstIA,
}, sv)
if err != nil {
return drkey.Lvl1Key{}, common.NewBasicError("Error deriving Lvl1 key", err)
}
return lvl1, nil
}