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// Copyright 2018-2023 The NATS Authors
// 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 server
import (
crand "crypto/rand"
"encoding/base64"
)
// Raw length of the nonce challenge
const (
nonceRawLen = 11
nonceLen = 15 // base64.RawURLEncoding.EncodedLen(nonceRawLen)
)
// NonceRequired tells us if we should send a nonce.
func (s *Server) NonceRequired() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.nonceRequired()
}
// nonceRequired tells us if we should send a nonce.
// Lock should be held on entry.
func (s *Server) nonceRequired() bool {
return s.getOpts().AlwaysEnableNonce || len(s.nkeys) > 0 || s.trustedKeys != nil
}
// Generate a nonce for INFO challenge.
// Assumes server lock is held
func (s *Server) generateNonce(n []byte) {
var raw [nonceRawLen]byte
data := raw[:]
crand.Read(data)
base64.RawURLEncoding.Encode(n, data)
}
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