mirror of
https://github.com/fatedier/frp
synced 2025-10-20 10:03:07 +08:00
289 lines
7.8 KiB
Go
289 lines
7.8 KiB
Go
package kcp
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/des"
|
|
"crypto/sha1"
|
|
|
|
"github.com/templexxx/xor"
|
|
"github.com/tjfoc/gmsm/sm4"
|
|
|
|
"golang.org/x/crypto/blowfish"
|
|
"golang.org/x/crypto/cast5"
|
|
"golang.org/x/crypto/pbkdf2"
|
|
"golang.org/x/crypto/salsa20"
|
|
"golang.org/x/crypto/tea"
|
|
"golang.org/x/crypto/twofish"
|
|
"golang.org/x/crypto/xtea"
|
|
)
|
|
|
|
var (
|
|
initialVector = []byte{167, 115, 79, 156, 18, 172, 27, 1, 164, 21, 242, 193, 252, 120, 230, 107}
|
|
saltxor = `sH3CIVoF#rWLtJo6`
|
|
)
|
|
|
|
// BlockCrypt defines encryption/decryption methods for a given byte slice.
|
|
// Notes on implementing: the data to be encrypted contains a builtin
|
|
// nonce at the first 16 bytes
|
|
type BlockCrypt interface {
|
|
// Encrypt encrypts the whole block in src into dst.
|
|
// Dst and src may point at the same memory.
|
|
Encrypt(dst, src []byte)
|
|
|
|
// Decrypt decrypts the whole block in src into dst.
|
|
// Dst and src may point at the same memory.
|
|
Decrypt(dst, src []byte)
|
|
}
|
|
|
|
type salsa20BlockCrypt struct {
|
|
key [32]byte
|
|
}
|
|
|
|
// NewSalsa20BlockCrypt https://en.wikipedia.org/wiki/Salsa20
|
|
func NewSalsa20BlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(salsa20BlockCrypt)
|
|
copy(c.key[:], key)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *salsa20BlockCrypt) Encrypt(dst, src []byte) {
|
|
salsa20.XORKeyStream(dst[8:], src[8:], src[:8], &c.key)
|
|
copy(dst[:8], src[:8])
|
|
}
|
|
func (c *salsa20BlockCrypt) Decrypt(dst, src []byte) {
|
|
salsa20.XORKeyStream(dst[8:], src[8:], src[:8], &c.key)
|
|
copy(dst[:8], src[:8])
|
|
}
|
|
|
|
type sm4BlockCrypt struct {
|
|
encbuf []byte
|
|
decbuf []byte
|
|
block cipher.Block
|
|
}
|
|
|
|
// NewSM4BlockCrypt https://github.com/tjfoc/gmsm/tree/master/sm4
|
|
func NewSM4BlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(sm4BlockCrypt)
|
|
block, err := sm4.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.block = block
|
|
c.encbuf = make([]byte, sm4.BlockSize)
|
|
c.decbuf = make([]byte, 2*sm4.BlockSize)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *sm4BlockCrypt) Encrypt(dst, src []byte) { encrypt(c.block, dst, src, c.encbuf) }
|
|
func (c *sm4BlockCrypt) Decrypt(dst, src []byte) { decrypt(c.block, dst, src, c.decbuf) }
|
|
|
|
type twofishBlockCrypt struct {
|
|
encbuf []byte
|
|
decbuf []byte
|
|
block cipher.Block
|
|
}
|
|
|
|
// NewTwofishBlockCrypt https://en.wikipedia.org/wiki/Twofish
|
|
func NewTwofishBlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(twofishBlockCrypt)
|
|
block, err := twofish.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.block = block
|
|
c.encbuf = make([]byte, twofish.BlockSize)
|
|
c.decbuf = make([]byte, 2*twofish.BlockSize)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *twofishBlockCrypt) Encrypt(dst, src []byte) { encrypt(c.block, dst, src, c.encbuf) }
|
|
func (c *twofishBlockCrypt) Decrypt(dst, src []byte) { decrypt(c.block, dst, src, c.decbuf) }
|
|
|
|
type tripleDESBlockCrypt struct {
|
|
encbuf []byte
|
|
decbuf []byte
|
|
block cipher.Block
|
|
}
|
|
|
|
// NewTripleDESBlockCrypt https://en.wikipedia.org/wiki/Triple_DES
|
|
func NewTripleDESBlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(tripleDESBlockCrypt)
|
|
block, err := des.NewTripleDESCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.block = block
|
|
c.encbuf = make([]byte, des.BlockSize)
|
|
c.decbuf = make([]byte, 2*des.BlockSize)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *tripleDESBlockCrypt) Encrypt(dst, src []byte) { encrypt(c.block, dst, src, c.encbuf) }
|
|
func (c *tripleDESBlockCrypt) Decrypt(dst, src []byte) { decrypt(c.block, dst, src, c.decbuf) }
|
|
|
|
type cast5BlockCrypt struct {
|
|
encbuf []byte
|
|
decbuf []byte
|
|
block cipher.Block
|
|
}
|
|
|
|
// NewCast5BlockCrypt https://en.wikipedia.org/wiki/CAST-128
|
|
func NewCast5BlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(cast5BlockCrypt)
|
|
block, err := cast5.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.block = block
|
|
c.encbuf = make([]byte, cast5.BlockSize)
|
|
c.decbuf = make([]byte, 2*cast5.BlockSize)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *cast5BlockCrypt) Encrypt(dst, src []byte) { encrypt(c.block, dst, src, c.encbuf) }
|
|
func (c *cast5BlockCrypt) Decrypt(dst, src []byte) { decrypt(c.block, dst, src, c.decbuf) }
|
|
|
|
type blowfishBlockCrypt struct {
|
|
encbuf []byte
|
|
decbuf []byte
|
|
block cipher.Block
|
|
}
|
|
|
|
// NewBlowfishBlockCrypt https://en.wikipedia.org/wiki/Blowfish_(cipher)
|
|
func NewBlowfishBlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(blowfishBlockCrypt)
|
|
block, err := blowfish.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.block = block
|
|
c.encbuf = make([]byte, blowfish.BlockSize)
|
|
c.decbuf = make([]byte, 2*blowfish.BlockSize)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *blowfishBlockCrypt) Encrypt(dst, src []byte) { encrypt(c.block, dst, src, c.encbuf) }
|
|
func (c *blowfishBlockCrypt) Decrypt(dst, src []byte) { decrypt(c.block, dst, src, c.decbuf) }
|
|
|
|
type aesBlockCrypt struct {
|
|
encbuf []byte
|
|
decbuf []byte
|
|
block cipher.Block
|
|
}
|
|
|
|
// NewAESBlockCrypt https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
|
|
func NewAESBlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(aesBlockCrypt)
|
|
block, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.block = block
|
|
c.encbuf = make([]byte, aes.BlockSize)
|
|
c.decbuf = make([]byte, 2*aes.BlockSize)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *aesBlockCrypt) Encrypt(dst, src []byte) { encrypt(c.block, dst, src, c.encbuf) }
|
|
func (c *aesBlockCrypt) Decrypt(dst, src []byte) { decrypt(c.block, dst, src, c.decbuf) }
|
|
|
|
type teaBlockCrypt struct {
|
|
encbuf []byte
|
|
decbuf []byte
|
|
block cipher.Block
|
|
}
|
|
|
|
// NewTEABlockCrypt https://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm
|
|
func NewTEABlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(teaBlockCrypt)
|
|
block, err := tea.NewCipherWithRounds(key, 16)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.block = block
|
|
c.encbuf = make([]byte, tea.BlockSize)
|
|
c.decbuf = make([]byte, 2*tea.BlockSize)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *teaBlockCrypt) Encrypt(dst, src []byte) { encrypt(c.block, dst, src, c.encbuf) }
|
|
func (c *teaBlockCrypt) Decrypt(dst, src []byte) { decrypt(c.block, dst, src, c.decbuf) }
|
|
|
|
type xteaBlockCrypt struct {
|
|
encbuf []byte
|
|
decbuf []byte
|
|
block cipher.Block
|
|
}
|
|
|
|
// NewXTEABlockCrypt https://en.wikipedia.org/wiki/XTEA
|
|
func NewXTEABlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(xteaBlockCrypt)
|
|
block, err := xtea.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
c.block = block
|
|
c.encbuf = make([]byte, xtea.BlockSize)
|
|
c.decbuf = make([]byte, 2*xtea.BlockSize)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *xteaBlockCrypt) Encrypt(dst, src []byte) { encrypt(c.block, dst, src, c.encbuf) }
|
|
func (c *xteaBlockCrypt) Decrypt(dst, src []byte) { decrypt(c.block, dst, src, c.decbuf) }
|
|
|
|
type simpleXORBlockCrypt struct {
|
|
xortbl []byte
|
|
}
|
|
|
|
// NewSimpleXORBlockCrypt simple xor with key expanding
|
|
func NewSimpleXORBlockCrypt(key []byte) (BlockCrypt, error) {
|
|
c := new(simpleXORBlockCrypt)
|
|
c.xortbl = pbkdf2.Key(key, []byte(saltxor), 32, mtuLimit, sha1.New)
|
|
return c, nil
|
|
}
|
|
|
|
func (c *simpleXORBlockCrypt) Encrypt(dst, src []byte) { xor.Bytes(dst, src, c.xortbl) }
|
|
func (c *simpleXORBlockCrypt) Decrypt(dst, src []byte) { xor.Bytes(dst, src, c.xortbl) }
|
|
|
|
type noneBlockCrypt struct{}
|
|
|
|
// NewNoneBlockCrypt does nothing but copying
|
|
func NewNoneBlockCrypt(key []byte) (BlockCrypt, error) {
|
|
return new(noneBlockCrypt), nil
|
|
}
|
|
|
|
func (c *noneBlockCrypt) Encrypt(dst, src []byte) { copy(dst, src) }
|
|
func (c *noneBlockCrypt) Decrypt(dst, src []byte) { copy(dst, src) }
|
|
|
|
// packet encryption with local CFB mode
|
|
func encrypt(block cipher.Block, dst, src, buf []byte) {
|
|
blocksize := block.BlockSize()
|
|
tbl := buf[:blocksize]
|
|
block.Encrypt(tbl, initialVector)
|
|
n := len(src) / blocksize
|
|
base := 0
|
|
for i := 0; i < n; i++ {
|
|
xor.BytesSrc1(dst[base:], src[base:], tbl)
|
|
block.Encrypt(tbl, dst[base:])
|
|
base += blocksize
|
|
}
|
|
xor.BytesSrc0(dst[base:], src[base:], tbl)
|
|
}
|
|
|
|
func decrypt(block cipher.Block, dst, src, buf []byte) {
|
|
blocksize := block.BlockSize()
|
|
tbl := buf[:blocksize]
|
|
next := buf[blocksize:]
|
|
block.Encrypt(tbl, initialVector)
|
|
n := len(src) / blocksize
|
|
base := 0
|
|
for i := 0; i < n; i++ {
|
|
block.Encrypt(next, src[base:])
|
|
xor.BytesSrc1(dst[base:], src[base:], tbl)
|
|
tbl, next = next, tbl
|
|
base += blocksize
|
|
}
|
|
xor.BytesSrc0(dst[base:], src[base:], tbl)
|
|
}
|