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msg_ecdhesecretkeyexchange.go
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/
msg_ecdhesecretkeyexchange.go
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package gtp
import (
"bytes"
"git.golaxy.org/framework/util/binaryutil"
)
// ECDHESecretKeyExchange消息标志位
const (
Flag_Signature Flag = 1 << (iota + Flag_Customize) // 有签名数据,在双方的ECDHE秘钥交换消息中携带,表示可以验证对方签名
)
// SignatureAlgorithm 签名算法
type SignatureAlgorithm struct {
AsymmetricEncryption AsymmetricEncryption // 非对称加密算法
PaddingMode PaddingMode // 填充方案
Hash Hash // 摘要函数
}
// Read implements io.Reader
func (sa SignatureAlgorithm) Read(p []byte) (int, error) {
bs := binaryutil.NewBigEndianStream(p)
if err := bs.WriteUint8(uint8(sa.AsymmetricEncryption)); err != nil {
return bs.BytesWritten(), err
}
if err := bs.WriteUint8(uint8(sa.PaddingMode)); err != nil {
return bs.BytesWritten(), err
}
if err := bs.WriteUint8(uint8(sa.Hash)); err != nil {
return bs.BytesWritten(), err
}
return bs.BytesWritten(), nil
}
// Write implements io.Writer
func (sa *SignatureAlgorithm) Write(p []byte) (int, error) {
bs := binaryutil.NewBigEndianStream(p)
asymmetricEncryption, err := bs.ReadUint8()
if err != nil {
return bs.BytesRead(), err
}
sa.AsymmetricEncryption = AsymmetricEncryption(asymmetricEncryption)
paddingMode, err := bs.ReadUint8()
if err != nil {
return bs.BytesRead(), err
}
sa.PaddingMode = PaddingMode(paddingMode)
hash, err := bs.ReadUint8()
if err != nil {
return bs.BytesRead(), err
}
sa.Hash = Hash(hash)
return bs.BytesRead(), nil
}
// Size 大小
func (SignatureAlgorithm) Size() int {
return binaryutil.SizeofUint8() + binaryutil.SizeofUint8() + binaryutil.SizeofUint8()
}
// MsgECDHESecretKeyExchange ECDHE秘钥交换消息,利用(g^a mod p)^b mod p == (g^b mod p)^a mod p等式,交换秘钥
// (注意:为了提高解码性能,减少内存碎片,解码string与bytes字段时均使用引用类型,引用字节池中的bytes,GC时会被归还字节池,不要直接持有此类型字段)
type MsgECDHESecretKeyExchange struct {
NamedCurve NamedCurve // 曲线类型
PublicKey []byte // 公钥
IV []byte // iv
Nonce []byte // nonce
NonceStep []byte // nonce step
SignatureAlgorithm SignatureAlgorithm // 签名算法
Signature []byte // 签名
}
// Read implements io.Reader
func (m MsgECDHESecretKeyExchange) Read(p []byte) (int, error) {
bs := binaryutil.NewBigEndianStream(p)
if err := bs.WriteUint8(uint8(m.NamedCurve)); err != nil {
return bs.BytesWritten(), err
}
if err := bs.WriteBytes(m.PublicKey); err != nil {
return bs.BytesWritten(), err
}
if err := bs.WriteBytes(m.IV); err != nil {
return bs.BytesWritten(), err
}
if err := bs.WriteBytes(m.Nonce); err != nil {
return bs.BytesWritten(), err
}
if err := bs.WriteBytes(m.NonceStep); err != nil {
return bs.BytesWritten(), err
}
if _, err := binaryutil.ReadFrom(&bs, m.SignatureAlgorithm); err != nil {
return bs.BytesWritten(), err
}
if err := bs.WriteBytes(m.Signature); err != nil {
return bs.BytesWritten(), err
}
return bs.BytesWritten(), nil
}
// Write implements io.Writer
func (m *MsgECDHESecretKeyExchange) Write(p []byte) (int, error) {
bs := binaryutil.NewBigEndianStream(p)
namedCurve, err := bs.ReadUint8()
if err != nil {
return bs.BytesRead(), err
}
m.NamedCurve = NamedCurve(namedCurve)
m.PublicKey, err = bs.ReadBytesRef()
if err != nil {
return bs.BytesRead(), err
}
m.IV, err = bs.ReadBytesRef()
if err != nil {
return bs.BytesRead(), err
}
m.Nonce, err = bs.ReadBytesRef()
if err != nil {
return bs.BytesRead(), err
}
m.NonceStep, err = bs.ReadBytesRef()
if err != nil {
return bs.BytesRead(), err
}
if _, err := bs.WriteTo(&m.SignatureAlgorithm); err != nil {
return bs.BytesRead(), err
}
m.Signature, err = bs.ReadBytesRef()
if err != nil {
return bs.BytesRead(), err
}
return bs.BytesRead(), nil
}
// Size 大小
func (m MsgECDHESecretKeyExchange) Size() int {
return binaryutil.SizeofUint8() + binaryutil.SizeofBytes(m.PublicKey) + binaryutil.SizeofBytes(m.IV) +
binaryutil.SizeofBytes(m.Nonce) + binaryutil.SizeofBytes(m.NonceStep) + m.SignatureAlgorithm.Size() +
binaryutil.SizeofBytes(m.Signature)
}
// MsgId 消息Id
func (MsgECDHESecretKeyExchange) MsgId() MsgId {
return MsgId_ECDHESecretKeyExchange
}
// Clone 克隆消息对象
func (m *MsgECDHESecretKeyExchange) Clone() Msg {
return &MsgECDHESecretKeyExchange{
NamedCurve: m.NamedCurve,
PublicKey: bytes.Clone(m.PublicKey),
IV: bytes.Clone(m.IV),
Nonce: bytes.Clone(m.Nonce),
NonceStep: bytes.Clone(m.NonceStep),
SignatureAlgorithm: m.SignatureAlgorithm,
Signature: bytes.Clone(m.Signature),
}
}