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// Copyright 2020 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 prf
import (
"fmt"
"github.com/tink-crypto/tink-go/v2/internal/internalapi"
"github.com/tink-crypto/tink-go/v2/internal/internalregistry"
"github.com/tink-crypto/tink-go/v2/internal/monitoringutil"
"github.com/tink-crypto/tink-go/v2/internal/primitiveset"
"github.com/tink-crypto/tink-go/v2/keyset"
"github.com/tink-crypto/tink-go/v2/monitoring"
)
// NewPRFSet creates a prf.Set primitive from the given keyset handle.
func NewPRFSet(handle *keyset.Handle) (*Set, error) {
ps, err := keyset.Primitives[PRF](handle, internalapi.Token{})
if err != nil {
return nil, fmt.Errorf("prf_set_factory: cannot obtain primitive set: %s", err)
}
return wrapPRFset(ps)
}
func wrapPRFset(ps *primitiveset.PrimitiveSet[PRF]) (*Set, error) {
set := &Set{}
set.PrimaryID = ps.Primary.KeyID
set.PRFs = make(map[uint32]PRF)
logger, err := createLogger(ps)
if err != nil {
return nil, err
}
entries, err := ps.RawEntries()
if err != nil {
return nil, fmt.Errorf("Could not get raw entries: %v", err)
}
if len(entries) == 0 {
return nil, fmt.Errorf("Did not find any raw entries")
}
if len(ps.Entries) != 1 {
return nil, fmt.Errorf("Only raw entries allowed for prf.Set")
}
for _, entry := range entries {
set.PRFs[entry.KeyID] = &monitoredPRF{
prf: entry.Primitive,
keyID: entry.KeyID,
logger: logger,
}
}
return set, nil
}
func createLogger(ps *primitiveset.PrimitiveSet[PRF]) (monitoring.Logger, error) {
if len(ps.Annotations) == 0 {
return &monitoringutil.DoNothingLogger{}, nil
}
keysetInfo, err := monitoringutil.KeysetInfoFromPrimitiveSet(ps)
if err != nil {
return nil, err
}
return internalregistry.GetMonitoringClient().NewLogger(&monitoring.Context{
KeysetInfo: keysetInfo,
Primitive: "prf",
APIFunction: "compute",
})
}
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