mirror of
https://github.com/MetaCubeX/mihomo.git
synced 2024-12-27 12:35:39 +08:00
132 lines
4.3 KiB
Go
132 lines
4.3 KiB
Go
package net
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"math/bits"
|
|
)
|
|
|
|
// kanged from https://github.com/nhooyr/websocket/blob/master/frame.go
|
|
// License: MIT
|
|
|
|
// MaskWebSocket applies the WebSocket masking algorithm to p
|
|
// with the given key.
|
|
// See https://tools.ietf.org/html/rfc6455#section-5.3
|
|
//
|
|
// The returned value is the correctly rotated key to
|
|
// to continue to mask/unmask the message.
|
|
//
|
|
// It is optimized for LittleEndian and expects the key
|
|
// to be in little endian.
|
|
//
|
|
// See https://github.com/golang/go/issues/31586
|
|
func MaskWebSocket(key uint32, b []byte) uint32 {
|
|
if len(b) >= 8 {
|
|
key64 := uint64(key)<<32 | uint64(key)
|
|
|
|
// At some point in the future we can clean these unrolled loops up.
|
|
// See https://github.com/golang/go/issues/31586#issuecomment-487436401
|
|
|
|
// Then we xor until b is less than 128 bytes.
|
|
for len(b) >= 128 {
|
|
v := binary.LittleEndian.Uint64(b)
|
|
binary.LittleEndian.PutUint64(b, v^key64)
|
|
v = binary.LittleEndian.Uint64(b[8:16])
|
|
binary.LittleEndian.PutUint64(b[8:16], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[16:24])
|
|
binary.LittleEndian.PutUint64(b[16:24], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[24:32])
|
|
binary.LittleEndian.PutUint64(b[24:32], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[32:40])
|
|
binary.LittleEndian.PutUint64(b[32:40], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[40:48])
|
|
binary.LittleEndian.PutUint64(b[40:48], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[48:56])
|
|
binary.LittleEndian.PutUint64(b[48:56], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[56:64])
|
|
binary.LittleEndian.PutUint64(b[56:64], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[64:72])
|
|
binary.LittleEndian.PutUint64(b[64:72], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[72:80])
|
|
binary.LittleEndian.PutUint64(b[72:80], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[80:88])
|
|
binary.LittleEndian.PutUint64(b[80:88], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[88:96])
|
|
binary.LittleEndian.PutUint64(b[88:96], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[96:104])
|
|
binary.LittleEndian.PutUint64(b[96:104], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[104:112])
|
|
binary.LittleEndian.PutUint64(b[104:112], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[112:120])
|
|
binary.LittleEndian.PutUint64(b[112:120], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[120:128])
|
|
binary.LittleEndian.PutUint64(b[120:128], v^key64)
|
|
b = b[128:]
|
|
}
|
|
|
|
// Then we xor until b is less than 64 bytes.
|
|
for len(b) >= 64 {
|
|
v := binary.LittleEndian.Uint64(b)
|
|
binary.LittleEndian.PutUint64(b, v^key64)
|
|
v = binary.LittleEndian.Uint64(b[8:16])
|
|
binary.LittleEndian.PutUint64(b[8:16], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[16:24])
|
|
binary.LittleEndian.PutUint64(b[16:24], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[24:32])
|
|
binary.LittleEndian.PutUint64(b[24:32], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[32:40])
|
|
binary.LittleEndian.PutUint64(b[32:40], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[40:48])
|
|
binary.LittleEndian.PutUint64(b[40:48], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[48:56])
|
|
binary.LittleEndian.PutUint64(b[48:56], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[56:64])
|
|
binary.LittleEndian.PutUint64(b[56:64], v^key64)
|
|
b = b[64:]
|
|
}
|
|
|
|
// Then we xor until b is less than 32 bytes.
|
|
for len(b) >= 32 {
|
|
v := binary.LittleEndian.Uint64(b)
|
|
binary.LittleEndian.PutUint64(b, v^key64)
|
|
v = binary.LittleEndian.Uint64(b[8:16])
|
|
binary.LittleEndian.PutUint64(b[8:16], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[16:24])
|
|
binary.LittleEndian.PutUint64(b[16:24], v^key64)
|
|
v = binary.LittleEndian.Uint64(b[24:32])
|
|
binary.LittleEndian.PutUint64(b[24:32], v^key64)
|
|
b = b[32:]
|
|
}
|
|
|
|
// Then we xor until b is less than 16 bytes.
|
|
for len(b) >= 16 {
|
|
v := binary.LittleEndian.Uint64(b)
|
|
binary.LittleEndian.PutUint64(b, v^key64)
|
|
v = binary.LittleEndian.Uint64(b[8:16])
|
|
binary.LittleEndian.PutUint64(b[8:16], v^key64)
|
|
b = b[16:]
|
|
}
|
|
|
|
// Then we xor until b is less than 8 bytes.
|
|
for len(b) >= 8 {
|
|
v := binary.LittleEndian.Uint64(b)
|
|
binary.LittleEndian.PutUint64(b, v^key64)
|
|
b = b[8:]
|
|
}
|
|
}
|
|
|
|
// Then we xor until b is less than 4 bytes.
|
|
for len(b) >= 4 {
|
|
v := binary.LittleEndian.Uint32(b)
|
|
binary.LittleEndian.PutUint32(b, v^key)
|
|
b = b[4:]
|
|
}
|
|
|
|
// xor remaining bytes.
|
|
for i := range b {
|
|
b[i] ^= byte(key)
|
|
key = bits.RotateLeft32(key, -8)
|
|
}
|
|
|
|
return key
|
|
}
|