mirror of
https://github.com/SagerNet/sing-box.git
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43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
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// Copyright 2020 Cloudflare, Inc. All rights reserved. Use of this source code
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// is governed by a BSD-style license that can be found in the LICENSE file.
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package tls
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import (
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"errors"
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"fmt"
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"github.com/cloudflare/circl/hpke"
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)
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// The mandatory-to-implement HPKE cipher suite for use with the ECH extension.
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var defaultHPKESuite hpke.Suite
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func init() {
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var err error
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defaultHPKESuite, err = hpkeAssembleSuite(
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uint16(hpke.KEM_X25519_HKDF_SHA256),
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uint16(hpke.KDF_HKDF_SHA256),
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uint16(hpke.AEAD_AES128GCM),
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)
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if err != nil {
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panic(fmt.Sprintf("hpke: mandatory-to-implement cipher suite not supported: %s", err))
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}
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}
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func hpkeAssembleSuite(kemId, kdfId, aeadId uint16) (hpke.Suite, error) {
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kem := hpke.KEM(kemId)
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if !kem.IsValid() {
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return hpke.Suite{}, errors.New("KEM is not supported")
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}
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kdf := hpke.KDF(kdfId)
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if !kdf.IsValid() {
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return hpke.Suite{}, errors.New("KDF is not supported")
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}
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aead := hpke.AEAD(aeadId)
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if !aead.IsValid() {
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return hpke.Suite{}, errors.New("AEAD is not supported")
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}
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return hpke.NewSuite(kem, kdf, aead), nil
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}
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