// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package tls

import (
	
	
	
	
	
	
	
	
	
	
	
	

	
)

// CipherSuite is a TLS cipher suite. Note that most functions in this package
// accept and expose cipher suite IDs instead of this type.
type CipherSuite struct {
	ID   uint16
	Name string

	// Supported versions is the list of TLS protocol versions that can
	// negotiate this cipher suite.
	SupportedVersions []uint16

	// Insecure is true if the cipher suite has known security issues
	// due to its primitives, design, or implementation.
	Insecure bool
}

var (
	supportedUpToTLS12 = []uint16{VersionTLS10, VersionTLS11, VersionTLS12}
	supportedOnlyTLS12 = []uint16{VersionTLS12}
	supportedOnlyTLS13 = []uint16{VersionTLS13}
)

// CipherSuites returns a list of cipher suites currently implemented by this
// package, excluding those with security issues, which are returned by
// InsecureCipherSuites.
//
// The list is sorted by ID. Note that the default cipher suites selected by
// this package might depend on logic that can't be captured by a static list,
// and might not match those returned by this function.
func () []*CipherSuite {
	return []*CipherSuite{
		{TLS_RSA_WITH_AES_128_CBC_SHA, "TLS_RSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
		{TLS_RSA_WITH_AES_256_CBC_SHA, "TLS_RSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
		{TLS_RSA_WITH_AES_128_GCM_SHA256, "TLS_RSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
		{TLS_RSA_WITH_AES_256_GCM_SHA384, "TLS_RSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},

		{TLS_AES_128_GCM_SHA256, "TLS_AES_128_GCM_SHA256", supportedOnlyTLS13, false},
		{TLS_AES_256_GCM_SHA384, "TLS_AES_256_GCM_SHA384", supportedOnlyTLS13, false},
		{TLS_CHACHA20_POLY1305_SHA256, "TLS_CHACHA20_POLY1305_SHA256", supportedOnlyTLS13, false},

		{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
		{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
		{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
		{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
		{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
		{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},
		{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
		{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},
		{TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256", supportedOnlyTLS12, false},
		{TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256", supportedOnlyTLS12, false},
	}
}

// InsecureCipherSuites returns a list of cipher suites currently implemented by
// this package and which have security issues.
//
// Most applications should not use the cipher suites in this list, and should
// only use those returned by CipherSuites.
func () []*CipherSuite {
	// This list includes RC4, CBC_SHA256, and 3DES cipher suites. See
	// cipherSuitesPreferenceOrder for details.
	return []*CipherSuite{
		{TLS_RSA_WITH_RC4_128_SHA, "TLS_RSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
		{TLS_RSA_WITH_3DES_EDE_CBC_SHA, "TLS_RSA_WITH_3DES_EDE_CBC_SHA", supportedUpToTLS12, true},
		{TLS_RSA_WITH_AES_128_CBC_SHA256, "TLS_RSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
		{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, "TLS_ECDHE_ECDSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
		{TLS_ECDHE_RSA_WITH_RC4_128_SHA, "TLS_ECDHE_RSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
		{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA", supportedUpToTLS12, true},
		{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
		{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
	}
}

// CipherSuiteName returns the standard name for the passed cipher suite ID
// (e.g. "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256"), or a fallback representation
// of the ID value if the cipher suite is not implemented by this package.
func ( uint16) string {
	for ,  := range CipherSuites() {
		if .ID ==  {
			return .Name
		}
	}
	for ,  := range InsecureCipherSuites() {
		if .ID ==  {
			return .Name
		}
	}
	return fmt.Sprintf("0x%04X", )
}

const (
	// suiteECDHE indicates that the cipher suite involves elliptic curve
	// Diffie-Hellman. This means that it should only be selected when the
	// client indicates that it supports ECC with a curve and point format
	// that we're happy with.
	suiteECDHE = 1 << iota
	// suiteECSign indicates that the cipher suite involves an ECDSA or
	// EdDSA signature and therefore may only be selected when the server's
	// certificate is ECDSA or EdDSA. If this is not set then the cipher suite
	// is RSA based.
	suiteECSign
	// suiteTLS12 indicates that the cipher suite should only be advertised
	// and accepted when using TLS 1.2.
	suiteTLS12
	// suiteSHA384 indicates that the cipher suite uses SHA384 as the
	// handshake hash.
	suiteSHA384
)

// A cipherSuite is a TLS 1.0–1.2 cipher suite, and defines the key exchange
// mechanism, as well as the cipher+MAC pair or the AEAD.
type cipherSuite struct {
	id uint16
	// the lengths, in bytes, of the key material needed for each component.
	keyLen int
	macLen int
	ivLen  int
	ka     func(version uint16) keyAgreement
	// flags is a bitmask of the suite* values, above.
	flags  int
	cipher func(key, iv []byte, isRead bool) interface{}
	mac    func(key []byte) hash.Hash
	aead   func(key, fixedNonce []byte) aead
}

var cipherSuites = []*cipherSuite{ // TODO: replace with a map, since the order doesn't matter.
	{TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305, 32, 0, 12, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadChaCha20Poly1305},
	{TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, 32, 0, 12, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, nil, nil, aeadChaCha20Poly1305},
	{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadAESGCM},
	{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, nil, nil, aeadAESGCM},
	{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
	{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
	{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, ecdheRSAKA, suiteECDHE | suiteTLS12, cipherAES, macSHA256, nil},
	{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
	{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, cipherAES, macSHA256, nil},
	{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherAES, macSHA1, nil},
	{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
	{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherAES, macSHA1, nil},
	{TLS_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, rsaKA, suiteTLS12, nil, nil, aeadAESGCM},
	{TLS_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, rsaKA, suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
	{TLS_RSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, rsaKA, suiteTLS12, cipherAES, macSHA256, nil},
	{TLS_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
	{TLS_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
	{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, ecdheRSAKA, suiteECDHE, cipher3DES, macSHA1, nil},
	{TLS_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, rsaKA, 0, cipher3DES, macSHA1, nil},
	{TLS_RSA_WITH_RC4_128_SHA, 16, 20, 0, rsaKA, 0, cipherRC4, macSHA1, nil},
	{TLS_ECDHE_RSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheRSAKA, suiteECDHE, cipherRC4, macSHA1, nil},
	{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherRC4, macSHA1, nil},
}

// selectCipherSuite returns the first TLS 1.0–1.2 cipher suite from ids which
// is also in supportedIDs and passes the ok filter.
func selectCipherSuite(,  []uint16,  func(*cipherSuite) bool) *cipherSuite {
	for ,  := range  {
		 := cipherSuiteByID()
		if  == nil || !() {
			continue
		}

		for ,  := range  {
			if  ==  {
				return 
			}
		}
	}
	return nil
}

// A cipherSuiteTLS13 defines only the pair of the AEAD algorithm and hash
// algorithm to be used with HKDF. See RFC 8446, Appendix B.4.
type cipherSuiteTLS13 struct {
	id     uint16
	keyLen int
	aead   func(key, fixedNonce []byte) aead
	hash   crypto.Hash
}

var cipherSuitesTLS13 = []*cipherSuiteTLS13{ // TODO: replace with a map.
	{TLS_AES_128_GCM_SHA256, 16, aeadAESGCMTLS13, crypto.SHA256},
	{TLS_CHACHA20_POLY1305_SHA256, 32, aeadChaCha20Poly1305, crypto.SHA256},
	{TLS_AES_256_GCM_SHA384, 32, aeadAESGCMTLS13, crypto.SHA384},
}

// cipherSuitesPreferenceOrder is the order in which we'll select (on the
// server) or advertise (on the client) TLS 1.0–1.2 cipher suites.
//
// Cipher suites are filtered but not reordered based on the application and
// peer's preferences, meaning we'll never select a suite lower in this list if
// any higher one is available. This makes it more defensible to keep weaker
// cipher suites enabled, especially on the server side where we get the last
// word, since there are no known downgrade attacks on cipher suites selection.
//
// The list is sorted by applying the following priority rules, stopping at the
// first (most important) applicable one:
//
//   - Anything else comes before RC4
//
//       RC4 has practically exploitable biases. See https://www.rc4nomore.com.
//
//   - Anything else comes before CBC_SHA256
//
//       SHA-256 variants of the CBC ciphersuites don't implement any Lucky13
//       countermeasures. See http://www.isg.rhul.ac.uk/tls/Lucky13.html and
//       https://www.imperialviolet.org/2013/02/04/luckythirteen.html.
//
//   - Anything else comes before 3DES
//
//       3DES has 64-bit blocks, which makes it fundamentally susceptible to
//       birthday attacks. See https://sweet32.info.
//
//   - ECDHE comes before anything else
//
//       Once we got the broken stuff out of the way, the most important
//       property a cipher suite can have is forward secrecy. We don't
//       implement FFDHE, so that means ECDHE.
//
//   - AEADs come before CBC ciphers
//
//       Even with Lucky13 countermeasures, MAC-then-Encrypt CBC cipher suites
//       are fundamentally fragile, and suffered from an endless sequence of
//       padding oracle attacks. See https://eprint.iacr.org/2015/1129,
//       https://www.imperialviolet.org/2014/12/08/poodleagain.html, and
//       https://blog.cloudflare.com/yet-another-padding-oracle-in-openssl-cbc-ciphersuites/.
//
//   - AES comes before ChaCha20
//
//       When AES hardware is available, AES-128-GCM and AES-256-GCM are faster
//       than ChaCha20Poly1305.
//
//       When AES hardware is not available, AES-128-GCM is one or more of: much
//       slower, way more complex, and less safe (because not constant time)
//       than ChaCha20Poly1305.
//
//       We use this list if we think both peers have AES hardware, and
//       cipherSuitesPreferenceOrderNoAES otherwise.
//
//   - AES-128 comes before AES-256
//
//       The only potential advantages of AES-256 are better multi-target
//       margins, and hypothetical post-quantum properties. Neither apply to
//       TLS, and AES-256 is slower due to its four extra rounds (which don't
//       contribute to the advantages above).
//
//   - ECDSA comes before RSA
//
//       The relative order of ECDSA and RSA cipher suites doesn't matter,
//       as they depend on the certificate. Pick one to get a stable order.
//
var cipherSuitesPreferenceOrder = []uint16{
	// AEADs w/ ECDHE
	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
	TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
	TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,

	// CBC w/ ECDHE
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
	TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,

	// AEADs w/o ECDHE
	TLS_RSA_WITH_AES_128_GCM_SHA256,
	TLS_RSA_WITH_AES_256_GCM_SHA384,

	// CBC w/o ECDHE
	TLS_RSA_WITH_AES_128_CBC_SHA,
	TLS_RSA_WITH_AES_256_CBC_SHA,

	// 3DES
	TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
	TLS_RSA_WITH_3DES_EDE_CBC_SHA,

	// CBC_SHA256
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
	TLS_RSA_WITH_AES_128_CBC_SHA256,

	// RC4
	TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
	TLS_RSA_WITH_RC4_128_SHA,
}

var cipherSuitesPreferenceOrderNoAES = []uint16{
	// ChaCha20Poly1305
	TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,

	// AES-GCM w/ ECDHE
	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
	TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,

	// The rest of cipherSuitesPreferenceOrder.
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
	TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
	TLS_RSA_WITH_AES_128_GCM_SHA256,
	TLS_RSA_WITH_AES_256_GCM_SHA384,
	TLS_RSA_WITH_AES_128_CBC_SHA,
	TLS_RSA_WITH_AES_256_CBC_SHA,
	TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
	TLS_RSA_WITH_3DES_EDE_CBC_SHA,
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
	TLS_RSA_WITH_AES_128_CBC_SHA256,
	TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
	TLS_RSA_WITH_RC4_128_SHA,
}

// disabledCipherSuites are not used unless explicitly listed in
// Config.CipherSuites. They MUST be at the end of cipherSuitesPreferenceOrder.
var disabledCipherSuites = []uint16{
	// CBC_SHA256
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
	TLS_RSA_WITH_AES_128_CBC_SHA256,

	// RC4
	TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
	TLS_RSA_WITH_RC4_128_SHA,
}

var (
	defaultCipherSuitesLen = len(cipherSuitesPreferenceOrder) - len(disabledCipherSuites)
	defaultCipherSuites    = cipherSuitesPreferenceOrder[:defaultCipherSuitesLen]
)

// defaultCipherSuitesTLS13 is also the preference order, since there are no
// disabled by default TLS 1.3 cipher suites. The same AES vs ChaCha20 logic as
// cipherSuitesPreferenceOrder applies.
var defaultCipherSuitesTLS13 = []uint16{
	TLS_AES_128_GCM_SHA256,
	TLS_AES_256_GCM_SHA384,
	TLS_CHACHA20_POLY1305_SHA256,
}

var defaultCipherSuitesTLS13NoAES = []uint16{
	TLS_CHACHA20_POLY1305_SHA256,
	TLS_AES_128_GCM_SHA256,
	TLS_AES_256_GCM_SHA384,
}

var (
	hasGCMAsmAMD64 = cpu.X86.HasAES && cpu.X86.HasPCLMULQDQ
	hasGCMAsmARM64 = cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
	// Keep in sync with crypto/aes/cipher_s390x.go.
	hasGCMAsmS390X = cpu.S390X.HasAES && cpu.S390X.HasAESCBC && cpu.S390X.HasAESCTR &&
		(cpu.S390X.HasGHASH || cpu.S390X.HasAESGCM)

	hasAESGCMHardwareSupport = runtime.GOARCH == "amd64" && hasGCMAsmAMD64 ||
		runtime.GOARCH == "arm64" && hasGCMAsmARM64 ||
		runtime.GOARCH == "s390x" && hasGCMAsmS390X
)

var aesgcmCiphers = map[uint16]bool{
	// TLS 1.2
	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256:   true,
	TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384:   true,
	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256: true,
	TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384: true,
	// TLS 1.3
	TLS_AES_128_GCM_SHA256: true,
	TLS_AES_256_GCM_SHA384: true,
}

var nonAESGCMAEADCiphers = map[uint16]bool{
	// TLS 1.2
	TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305:   true,
	TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305: true,
	// TLS 1.3
	TLS_CHACHA20_POLY1305_SHA256: true,
}

// aesgcmPreferred returns whether the first known cipher in the preference list
// is an AES-GCM cipher, implying the peer has hardware support for it.
func aesgcmPreferred( []uint16) bool {
	for ,  := range  {
		if  := cipherSuiteByID();  != nil {
			return aesgcmCiphers[]
		}
		if  := cipherSuiteTLS13ByID();  != nil {
			return aesgcmCiphers[]
		}
	}
	return false
}

func cipherRC4(,  []byte,  bool) interface{} {
	,  := rc4.NewCipher()
	return 
}

func cipher3DES(,  []byte,  bool) interface{} {
	,  := des.NewTripleDESCipher()
	if  {
		return cipher.NewCBCDecrypter(, )
	}
	return cipher.NewCBCEncrypter(, )
}

func cipherAES(,  []byte,  bool) interface{} {
	,  := aes.NewCipher()
	if  {
		return cipher.NewCBCDecrypter(, )
	}
	return cipher.NewCBCEncrypter(, )
}

// macSHA1 returns a SHA-1 based constant time MAC.
func macSHA1( []byte) hash.Hash {
	return hmac.New(newConstantTimeHash(sha1.New), )
}

// macSHA256 returns a SHA-256 based MAC. This is only supported in TLS 1.2 and
// is currently only used in disabled-by-default cipher suites.
func macSHA256( []byte) hash.Hash {
	return hmac.New(sha256.New, )
}

type aead interface {
	cipher.AEAD

	// explicitNonceLen returns the number of bytes of explicit nonce
	// included in each record. This is eight for older AEADs and
	// zero for modern ones.
	explicitNonceLen() int
}

const (
	aeadNonceLength   = 12
	noncePrefixLength = 4
)

// prefixNonceAEAD wraps an AEAD and prefixes a fixed portion of the nonce to
// each call.
type prefixNonceAEAD struct {
	// nonce contains the fixed part of the nonce in the first four bytes.
	nonce [aeadNonceLength]byte
	aead  cipher.AEAD
}

func ( *prefixNonceAEAD) () int        { return aeadNonceLength - noncePrefixLength }
func ( *prefixNonceAEAD) () int         { return .aead.Overhead() }
func ( *prefixNonceAEAD) () int { return .NonceSize() }

func ( *prefixNonceAEAD) (, , ,  []byte) []byte {
	copy(.nonce[4:], )
	return .aead.Seal(, .nonce[:], , )
}

func ( *prefixNonceAEAD) (, , ,  []byte) ([]byte, error) {
	copy(.nonce[4:], )
	return .aead.Open(, .nonce[:], , )
}

// xoredNonceAEAD wraps an AEAD by XORing in a fixed pattern to the nonce
// before each call.
type xorNonceAEAD struct {
	nonceMask [aeadNonceLength]byte
	aead      cipher.AEAD
}

func ( *xorNonceAEAD) () int        { return 8 } // 64-bit sequence number
func ( *xorNonceAEAD) () int         { return .aead.Overhead() }
func ( *xorNonceAEAD) () int { return 0 }

func ( *xorNonceAEAD) (, , ,  []byte) []byte {
	for ,  := range  {
		.nonceMask[4+] ^= 
	}
	 := .aead.Seal(, .nonceMask[:], , )
	for ,  := range  {
		.nonceMask[4+] ^= 
	}

	return 
}

func ( *xorNonceAEAD) (, , ,  []byte) ([]byte, error) {
	for ,  := range  {
		.nonceMask[4+] ^= 
	}
	,  := .aead.Open(, .nonceMask[:], , )
	for ,  := range  {
		.nonceMask[4+] ^= 
	}

	return , 
}

func aeadAESGCM(,  []byte) aead {
	if len() != noncePrefixLength {
		panic("tls: internal error: wrong nonce length")
	}
	,  := aes.NewCipher()
	if  != nil {
		panic()
	}
	,  := cipher.NewGCM()
	if  != nil {
		panic()
	}

	 := &prefixNonceAEAD{aead: }
	copy(.nonce[:], )
	return 
}

func aeadAESGCMTLS13(,  []byte) aead {
	if len() != aeadNonceLength {
		panic("tls: internal error: wrong nonce length")
	}
	,  := aes.NewCipher()
	if  != nil {
		panic()
	}
	,  := cipher.NewGCM()
	if  != nil {
		panic()
	}

	 := &xorNonceAEAD{aead: }
	copy(.nonceMask[:], )
	return 
}

func aeadChaCha20Poly1305(,  []byte) aead {
	if len() != aeadNonceLength {
		panic("tls: internal error: wrong nonce length")
	}
	,  := chacha20poly1305.New()
	if  != nil {
		panic()
	}

	 := &xorNonceAEAD{aead: }
	copy(.nonceMask[:], )
	return 
}

type constantTimeHash interface {
	hash.Hash
	ConstantTimeSum(b []byte) []byte
}

// cthWrapper wraps any hash.Hash that implements ConstantTimeSum, and replaces
// with that all calls to Sum. It's used to obtain a ConstantTimeSum-based HMAC.
type cthWrapper struct {
	h constantTimeHash
}

func ( *cthWrapper) () int                   { return .h.Size() }
func ( *cthWrapper) () int              { return .h.BlockSize() }
func ( *cthWrapper) ()                      { .h.Reset() }
func ( *cthWrapper) ( []byte) (int, error) { return .h.Write() }
func ( *cthWrapper) ( []byte) []byte         { return .h.ConstantTimeSum() }

func newConstantTimeHash( func() hash.Hash) func() hash.Hash {
	return func() hash.Hash {
		return &cthWrapper{().(constantTimeHash)}
	}
}

// tls10MAC implements the TLS 1.0 MAC function. RFC 2246, Section 6.2.3.
func tls10MAC( hash.Hash, , , , ,  []byte) []byte {
	.Reset()
	.Write()
	.Write()
	.Write()
	 := .Sum()
	if  != nil {
		.Write()
	}
	return 
}

func rsaKA( uint16) keyAgreement {
	return rsaKeyAgreement{}
}

func ecdheECDSAKA( uint16) keyAgreement {
	return &ecdheKeyAgreement{
		isRSA:   false,
		version: ,
	}
}

func ecdheRSAKA( uint16) keyAgreement {
	return &ecdheKeyAgreement{
		isRSA:   true,
		version: ,
	}
}

// mutualCipherSuite returns a cipherSuite given a list of supported
// ciphersuites and the id requested by the peer.
func mutualCipherSuite( []uint16,  uint16) *cipherSuite {
	for ,  := range  {
		if  ==  {
			return cipherSuiteByID()
		}
	}
	return nil
}

func cipherSuiteByID( uint16) *cipherSuite {
	for ,  := range cipherSuites {
		if .id ==  {
			return 
		}
	}
	return nil
}

func mutualCipherSuiteTLS13( []uint16,  uint16) *cipherSuiteTLS13 {
	for ,  := range  {
		if  ==  {
			return cipherSuiteTLS13ByID()
		}
	}
	return nil
}

func cipherSuiteTLS13ByID( uint16) *cipherSuiteTLS13 {
	for ,  := range cipherSuitesTLS13 {
		if .id ==  {
			return 
		}
	}
	return nil
}

// A list of cipher suite IDs that are, or have been, implemented by this
// package.
//
// See https://www.iana.org/assignments/tls-parameters/tls-parameters.xml
const (
	// TLS 1.0 - 1.2 cipher suites.
	TLS_RSA_WITH_RC4_128_SHA                      uint16 = 0x0005
	TLS_RSA_WITH_3DES_EDE_CBC_SHA                 uint16 = 0x000a
	TLS_RSA_WITH_AES_128_CBC_SHA                  uint16 = 0x002f
	TLS_RSA_WITH_AES_256_CBC_SHA                  uint16 = 0x0035
	TLS_RSA_WITH_AES_128_CBC_SHA256               uint16 = 0x003c
	TLS_RSA_WITH_AES_128_GCM_SHA256               uint16 = 0x009c
	TLS_RSA_WITH_AES_256_GCM_SHA384               uint16 = 0x009d
	TLS_ECDHE_ECDSA_WITH_RC4_128_SHA              uint16 = 0xc007
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA          uint16 = 0xc009
	TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA          uint16 = 0xc00a
	TLS_ECDHE_RSA_WITH_RC4_128_SHA                uint16 = 0xc011
	TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA           uint16 = 0xc012
	TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA            uint16 = 0xc013
	TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA            uint16 = 0xc014
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256       uint16 = 0xc023
	TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256         uint16 = 0xc027
	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256         uint16 = 0xc02f
	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256       uint16 = 0xc02b
	TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384         uint16 = 0xc030
	TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384       uint16 = 0xc02c
	TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256   uint16 = 0xcca8
	TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xcca9

	// TLS 1.3 cipher suites.
	TLS_AES_128_GCM_SHA256       uint16 = 0x1301
	TLS_AES_256_GCM_SHA384       uint16 = 0x1302
	TLS_CHACHA20_POLY1305_SHA256 uint16 = 0x1303

	// TLS_FALLBACK_SCSV isn't a standard cipher suite but an indicator
	// that the client is doing version fallback. See RFC 7507.
	TLS_FALLBACK_SCSV uint16 = 0x5600

	// Legacy names for the corresponding cipher suites with the correct _SHA256
	// suffix, retained for backward compatibility.
	TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305   = TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
	TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305 = TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
)