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64 lines
2.0 KiB
Go
64 lines
2.0 KiB
Go
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/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package conn
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import core "google.golang.org/grpc/credentials/alts/internal"
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// NewOutCounter returns an outgoing counter initialized to the starting sequence
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// number for the client/server side of a connection.
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func NewOutCounter(s core.Side, overflowLen int) (c Counter) {
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c.overflowLen = overflowLen
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if s == core.ServerSide {
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// Server counters in ALTS record have the little-endian high bit
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// set.
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c.value[counterLen-1] = 0x80
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}
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return
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}
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// NewInCounter returns an incoming counter initialized to the starting sequence
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// number for the client/server side of a connection. This is used in ALTS record
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// to check that incoming counters are as expected, since ALTS record guarantees
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// that messages are unwrapped in the same order that the peer wrapped them.
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func NewInCounter(s core.Side, overflowLen int) (c Counter) {
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c.overflowLen = overflowLen
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if s == core.ClientSide {
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// Server counters in ALTS record have the little-endian high bit
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// set.
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c.value[counterLen-1] = 0x80
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}
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return
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}
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// CounterFromValue creates a new counter given an initial value.
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func CounterFromValue(value []byte, overflowLen int) (c Counter) {
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c.overflowLen = overflowLen
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copy(c.value[:], value)
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return
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}
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// CounterSide returns the connection side (client/server) a sequence counter is
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// associated with.
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func CounterSide(c []byte) core.Side {
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if c[counterLen-1]&0x80 == 0x80 {
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return core.ServerSide
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}
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return core.ClientSide
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}
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