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null_aead_aesgcm.go
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null_aead_aesgcm.go
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package crypto
import (
"crypto"
"v2ray.com/core/external/github.com/lucas-clemente/quic-go/internal/protocol"
)
var quicVersion1Salt = []byte{0x9c, 0x10, 0x8f, 0x98, 0x52, 0x0a, 0x5c, 0x5c, 0x32, 0x96, 0x8e, 0x95, 0x0e, 0x8a, 0x2c, 0x5f, 0xe0, 0x6d, 0x6c, 0x38}
// NewNullAEAD creates a NullAEAD
func NewNullAEAD(connectionID protocol.ConnectionID, pers protocol.Perspective) (AEAD, error) {
clientSecret, serverSecret := computeSecrets(connectionID)
var mySecret, otherSecret []byte
if pers == protocol.PerspectiveClient {
mySecret = clientSecret
otherSecret = serverSecret
} else {
mySecret = serverSecret
otherSecret = clientSecret
}
myKey, myIV := computeNullAEADKeyAndIV(mySecret)
otherKey, otherIV := computeNullAEADKeyAndIV(otherSecret)
return NewAEADAESGCM(otherKey, myKey, otherIV, myIV)
}
func computeSecrets(connID protocol.ConnectionID) (clientSecret, serverSecret []byte) {
initialSecret := hkdfExtract(crypto.SHA256, connID, quicVersion1Salt)
clientSecret = HkdfExpandLabel(crypto.SHA256, initialSecret, "client in", crypto.SHA256.Size())
serverSecret = HkdfExpandLabel(crypto.SHA256, initialSecret, "server in", crypto.SHA256.Size())
return
}
func computeNullAEADKeyAndIV(secret []byte) (key, iv []byte) {
key = HkdfExpandLabel(crypto.SHA256, secret, "key", 16)
iv = HkdfExpandLabel(crypto.SHA256, secret, "iv", 12)
return
}