yaole
100 lines
3.1 KiB
Go
100 lines
3.1 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package sdf
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import (
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"crypto/hmac"
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"hash"
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"xdx.jelly/xgcl/sm/sm3"
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)
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// Split a premaster secret in two as specified in RFC 4346, Section 5.
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func splitPreMasterSecret(secret []byte) (s1, s2 []byte) {
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s1 = secret[0 : (len(secret)+1)/2]
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s2 = secret[len(secret)/2:]
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return
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}
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// pHash implements the P_hash function, as defined in RFC 4346, Section 5.
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func pHash(result, secret, seed []byte, hash func() hash.Hash) {
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h := hmac.New(hash, secret)
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h.Write(seed)
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a := h.Sum(nil)
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j := 0
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for j < len(result) {
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h.Reset()
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h.Write(a)
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h.Write(seed)
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b := h.Sum(nil)
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copy(result[j:], b)
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j += len(b)
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h.Reset()
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h.Write(a)
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a = h.Sum(nil)
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}
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}
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func prfTLCP(result, secret, label, seed []byte) {
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labelAndSeed := make([]byte, len(label)+len(seed))
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copy(labelAndSeed, label)
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copy(labelAndSeed[len(label):], seed)
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pHash(result, secret, labelAndSeed, sm3.New)
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}
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const (
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masterSecretLength = 48 // Length of a master secret in TLS 1.1.
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finishedVerifyLength = 12 // Length of verify_data in a Finished message.
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)
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var masterSecretLabel = []byte("master secret")
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var keyExpansionLabel = []byte("key expansion")
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// masterFromPreMasterSecret generates the master secret from the pre-master
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// secret. See RFC 5246, Section 8.1.
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func masterFromPreMasterSecretTLCP(preMasterSecret, clientRandom, serverRandom []byte) []byte {
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seed := make([]byte, 0, len(clientRandom)+len(serverRandom))
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seed = append(seed, clientRandom...)
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seed = append(seed, serverRandom...)
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masterSecret := make([]byte, masterSecretLength)
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prfTLCP(masterSecret, preMasterSecret, masterSecretLabel, seed)
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return masterSecret
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}
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// keysFromMasterSecret generates the connection keys from the master
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// secret, given the lengths of the MAC key, cipher key and IV, as defined in
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// RFC 2246, Section 6.3.
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func keysFromMasterSecretTLCP(masterSecret, clientRandom, serverRandom []byte, macLen, keyLen, ivLen int) (clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV []byte) {
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seed := make([]byte, 0, len(serverRandom)+len(clientRandom))
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seed = append(seed, serverRandom...)
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seed = append(seed, clientRandom...)
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n := 2*macLen + 2*keyLen + 2*ivLen
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keyMaterial := make([]byte, n)
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prfTLCP(keyMaterial, masterSecret, keyExpansionLabel, seed)
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clientMAC = keyMaterial[:macLen]
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keyMaterial = keyMaterial[macLen:]
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serverMAC = keyMaterial[:macLen]
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keyMaterial = keyMaterial[macLen:]
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clientKey = keyMaterial[:keyLen]
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keyMaterial = keyMaterial[keyLen:]
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serverKey = keyMaterial[:keyLen]
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keyMaterial = keyMaterial[keyLen:]
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clientIV = keyMaterial[:ivLen]
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keyMaterial = keyMaterial[ivLen:]
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serverIV = keyMaterial[:ivLen]
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return
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}
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func KeysFromPreMasterSecretTLCP(preMasterSecret, clientRandom, serverRandom []byte, macLen, keyLen, ivLen int) (clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV []byte) {
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masterSecret := masterFromPreMasterSecretTLCP(preMasterSecret, clientRandom, serverRandom)
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return keysFromMasterSecretTLCP(masterSecret, clientRandom, serverRandom, macLen, keyLen, ivLen)
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}
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