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// Copyright 2018 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 keyset
import (
"fmt"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
// ValidateKeyVersion checks whether the given version is valid. The version is valid
// only if it is the range [0..maxExpected]
func ValidateKeyVersion(version, maxExpected uint32) error {
if version > maxExpected {
return fmt.Errorf("key has version %v; only keys with version in range [0..%v] are supported",
version, maxExpected)
}
return nil
}
// Validate validates the given key set.
// Returns nil if it is valid; an error otherwise.
func Validate(keyset *tinkpb.Keyset) error {
if keyset == nil {
return fmt.Errorf("Validate() called with nil")
}
if len(keyset.Key) == 0 {
return fmt.Errorf("empty keyset")
}
primaryKeyID := keyset.PrimaryKeyId
hasPrimaryKey := false
numEnabledKeys := 0
for _, key := range keyset.Key {
if err := validateKey(key); err != nil {
return err
}
if key.Status != tinkpb.KeyStatusType_ENABLED {
continue
}
if key.KeyId == primaryKeyID {
if hasPrimaryKey {
return fmt.Errorf("keyset contains multiple primary keys")
}
hasPrimaryKey = true
}
numEnabledKeys++
}
if numEnabledKeys == 0 {
return fmt.Errorf("keyset must contain at least one ENABLED key")
}
if !hasPrimaryKey {
return fmt.Errorf("keyset does not contain a valid primary key")
}
return nil
}
/*
validateKey validates the given key.
Returns nil if it is valid; an error otherwise.
*/
func validateKey(key *tinkpb.Keyset_Key) error {
if key == nil {
return fmt.Errorf("ValidateKey() called with nil")
}
if key.KeyData == nil {
return fmt.Errorf("key %d has no key data", key.KeyId)
}
if key.OutputPrefixType != tinkpb.OutputPrefixType_TINK &&
key.OutputPrefixType != tinkpb.OutputPrefixType_LEGACY &&
key.OutputPrefixType != tinkpb.OutputPrefixType_RAW &&
key.OutputPrefixType != tinkpb.OutputPrefixType_CRUNCHY {
return fmt.Errorf("key %d has unknown prefix", key.KeyId)
}
if key.Status != tinkpb.KeyStatusType_ENABLED &&
key.Status != tinkpb.KeyStatusType_DISABLED &&
key.Status != tinkpb.KeyStatusType_DESTROYED {
return fmt.Errorf("key %d has unknown status", key.KeyId)
}
return nil
}
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