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lazy init of authenticator

This commit is contained in:
Darien Raymond 2017-11-27 10:42:51 +01:00
parent eef2a72ac0
commit 64e5430ed9
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GPG Key ID: 7251FFA14BB18169
1 changed files with 5 additions and 1 deletions
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6
proxy/shadowsocks/protocol.go
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@ -284,9 +284,12 @@ func DecodeUDPPacket(user *protocol.User, payload *buf.Buffer) (*protocol.Reques
}
account := rawAccount.(*ShadowsocksAccount)
var iv []byte
var authenticator *Authenticator
if !account.Cipher.IsAEAD() {
authenticator = NewAuthenticator(HeaderKeyGenerator(account.Key, payload.BytesTo(account.Cipher.IVSize())))
// Keep track of IV as it gets removed from payload in DecodePacket.
iv = make([]byte, account.Cipher.IVSize())
copy(iv, payload.BytesTo(account.Cipher.IVSize()))
}
if err := account.Cipher.DecodePacket(account.Key, payload); err != nil {
@ -316,6 +319,7 @@ func DecodeUDPPacket(user *protocol.User, payload *buf.Buffer) (*protocol.Reques
payloadLen := payload.Len() - AuthSize
authBytes := payload.BytesFrom(payloadLen)
authenticator = NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
actualAuth := make([]byte, AuthSize)
authenticator.Authenticate(payload.BytesTo(payloadLen))(actualAuth)
if !bytes.Equal(actualAuth, authBytes) {