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// Copyright 2019 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 cryptofmt_test
import (
"testing"
"github.com/tink-crypto/tink-go/v2/core/cryptofmt"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
var tests = []struct {
keyID uint32
result string // expected prefix
}{
{
keyID: 1000000,
result: string([]byte{0, 15, 66, 64}),
},
{
keyID: 4294967295,
result: string([]byte{255, 255, 255, 255}),
},
{
keyID: 0,
result: string([]byte{0, 0, 0, 0}),
},
}
func TestOutputPrefix(t *testing.T) {
key := new(tinkpb.Keyset_Key)
for i, test := range tests {
key.KeyId = test.keyID
// legacy type
key.OutputPrefixType = tinkpb.OutputPrefixType_LEGACY
prefix, err := cryptofmt.OutputPrefix(key)
if err != nil || !validatePrefix(prefix, cryptofmt.LegacyStartByte, test.result) {
t.Errorf("incorrect legacy prefix in test %d", i)
}
// crunchy type
key.OutputPrefixType = tinkpb.OutputPrefixType_CRUNCHY
prefix, err = cryptofmt.OutputPrefix(key)
if err != nil || !validatePrefix(prefix, cryptofmt.LegacyStartByte, test.result) {
t.Errorf("incorrect legacy prefix in test %d", i)
}
// tink type
key.OutputPrefixType = tinkpb.OutputPrefixType_TINK
prefix, err = cryptofmt.OutputPrefix(key)
if err != nil || !validatePrefix(prefix, cryptofmt.TinkStartByte, test.result) {
t.Errorf("incorrect tink prefix in test %d", i)
}
// raw type
key.OutputPrefixType = tinkpb.OutputPrefixType_RAW
prefix, err = cryptofmt.OutputPrefix(key)
if err != nil || prefix != cryptofmt.RawPrefix {
t.Errorf("incorrect raw prefix in test %d", i)
}
}
// unknown prefix type
key.OutputPrefixType = tinkpb.OutputPrefixType_UNKNOWN_PREFIX
if _, err := cryptofmt.OutputPrefix(key); err == nil {
t.Errorf("expect an error when prefix type is unknown")
}
}
func validatePrefix(prefix string, startByte byte, key string) bool {
if prefix[0] != startByte {
return false
}
return prefix[1:] == key
}
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