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cipher.go
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cipher.go
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package cipher
import (
"crypto/aes"
"crypto/cipher"
"crypto/des"
"crypto/md5"
"crypto/rc4"
"encoding/binary"
"github.com/Asutorufa/yuhaiin/pkg/net/proxy/shadowsocksr/cipher/camellia"
"github.com/Asutorufa/yuhaiin/pkg/net/proxy/shadowsocksr/cipher/idea"
"github.com/Asutorufa/yuhaiin/pkg/net/proxy/shadowsocksr/cipher/rc2"
"github.com/Asutorufa/yuhaiin/pkg/utils/pool"
"golang.org/x/crypto/blowfish"
"golang.org/x/crypto/cast5"
"golang.org/x/crypto/chacha20"
"golang.org/x/crypto/salsa20/salsa"
)
func newAESCTRStream(key, iv []byte, _ bool) (cipher.Stream, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
return cipher.NewCTR(block, iv), nil
}
func newAESOFBStream(key, iv []byte, _ bool) (cipher.Stream, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
return cipher.NewOFB(block, iv), nil
}
func newRC4MD5Stream(key, iv []byte, _ bool) (cipher.Stream, error) {
rc4key := md5.Sum(append(key, iv...))
return rc4.NewCipher(rc4key[:])
}
func newChaCha20Stream(key, iv []byte, _ bool) (cipher.Stream, error) {
return chacha20.NewUnauthenticatedCipher(key, iv)
}
type salsaStreamCipher struct {
nonce [8]byte
key [32]byte
counter int
}
func (c *salsaStreamCipher) XORKeyStream(dst, src []byte) {
var buf []byte
padLen := c.counter % 64
dataSize := len(src) + padLen
if cap(dst) >= dataSize {
buf = dst[:dataSize]
} else if pool.DefaultSize >= dataSize {
buf = pool.GetBytes(pool.DefaultSize)
defer pool.PutBytes(buf)
buf = buf[:dataSize]
} else {
buf = make([]byte, dataSize)
}
var subNonce [16]byte
copy(subNonce[:], c.nonce[:])
binary.LittleEndian.PutUint64(subNonce[len(c.nonce):], uint64(c.counter/64))
// It's difficult to avoid data copy here. src or dst maybe slice from
// Conn.Read/Write, which can't have padding.
copy(buf[padLen:], src[:])
salsa.XORKeyStream(buf, buf, &subNonce, &c.key)
copy(dst, buf[padLen:])
c.counter += len(src)
}
func newSalsa20Stream(key, iv []byte, _ bool) (cipher.Stream, error) {
var c salsaStreamCipher
copy(c.nonce[:], iv[:8])
copy(c.key[:], key[:32])
return &c, nil
}
func newRC4Stream(key, iv []byte, doe bool) (cipher.Stream, error) {
return rc4.NewCipher(key)
}
func newCFBStream(block cipher.Block, err error, iv []byte, decrypt bool) (cipher.Stream, error) {
if err != nil {
return nil, err
}
if !decrypt {
return cipher.NewCFBEncrypter(block, iv), nil
} else {
return cipher.NewCFBDecrypter(block, iv), nil
}
}
func newAESCFBStream(key, iv []byte, doe bool) (cipher.Stream, error) {
block, err := aes.NewCipher(key)
return newCFBStream(block, err, iv, doe)
}
func newDESStream(key, iv []byte, doe bool) (cipher.Stream, error) {
block, err := des.NewCipher(key)
return newCFBStream(block, err, iv, doe)
}
func newBlowFishStream(key, iv []byte, doe bool) (cipher.Stream, error) {
aes.NewCipher(key)
block, err := blowfish.NewCipher(key)
return newCFBStream(block, err, iv, doe)
}
func newCast5Stream(key, iv []byte, doe bool) (cipher.Stream, error) {
block, err := cast5.NewCipher(key)
return newCFBStream(block, err, iv, doe)
}
func newCamelliaStream(key, iv []byte, doe bool) (cipher.Stream, error) {
block, err := camellia.NewCipher(key)
return newCFBStream(block, err, iv, doe)
}
func newIdeaStream(key, iv []byte, doe bool) (cipher.Stream, error) {
block, err := idea.NewCipher(key)
return newCFBStream(block, err, iv, doe)
}
func newRC2Stream(key, iv []byte, doe bool) (cipher.Stream, error) {
block, err := rc2.New(key, 16)
return newCFBStream(block, err, iv, doe)
}
func newSeedStream(key, iv []byte, doe bool) (cipher.Stream, error) {
// TODO: SEED block cipher implementation is required
block, err := rc2.New(key, 16)
return newCFBStream(block, err, iv, doe)
}
type NoneStream struct{}
func (NoneStream) XORKeyStream(dst, src []byte) { copy(dst, src) }
func newNoneStream(key, iv []byte, doe bool) (cipher.Stream, error) { return new(NoneStream), nil }
type CipherFactory interface {
IVSize() int
EncryptStream(iv []byte) (cipher.Stream, error)
DecryptStream(iv []byte) (cipher.Stream, error)
}
type cipherFactory struct {
key []byte
ivSize int
stream func(key, iv []byte, decrypt bool) (cipher.Stream, error)
}
func (c cipherFactory) IVSize() int { return c.ivSize }
func (c cipherFactory) EncryptStream(iv []byte) (cipher.Stream, error) {
return c.stream(c.key, iv, false)
}
func (c cipherFactory) DecryptStream(iv []byte) (cipher.Stream, error) {
return c.stream(c.key, iv, true)
}
func newCipherObserver(keySize, ivSize int, stream func(key, iv []byte, decrypt bool) (cipher.Stream, error)) struct {
KeySize int
Creator func(key []byte) CipherFactory
} {
return struct {
KeySize int
Creator func(key []byte) CipherFactory
}{
KeySize: keySize,
Creator: func(key []byte) CipherFactory {
return cipherFactory{key, ivSize, stream}
},
}
}
var StreamCipherMethod = map[string]struct {
KeySize int
Creator func(key []byte) CipherFactory
}{
"aes-128-cfb": newCipherObserver(16, 16, newAESCFBStream),
"aes-192-cfb": newCipherObserver(24, 16, newAESCFBStream),
"aes-256-cfb": newCipherObserver(32, 16, newAESCFBStream),
"aes-128-ctr": newCipherObserver(16, 16, newAESCTRStream),
"aes-192-ctr": newCipherObserver(24, 16, newAESCTRStream),
"aes-256-ctr": newCipherObserver(32, 16, newAESCTRStream),
"aes-128-ofb": newCipherObserver(16, 16, newAESOFBStream),
"aes-192-ofb": newCipherObserver(24, 16, newAESOFBStream),
"aes-256-ofb": newCipherObserver(32, 16, newAESOFBStream),
"des-cfb": newCipherObserver(8, 8, newDESStream),
"bf-cfb": newCipherObserver(16, 8, newBlowFishStream),
"cast5-cfb": newCipherObserver(16, 8, newCast5Stream),
"rc4-md5": newCipherObserver(16, 16, newRC4MD5Stream),
"rc4-md5-6": newCipherObserver(16, 6, newRC4MD5Stream),
"chacha20": newCipherObserver(chacha20.KeySize, 8, newChaCha20Stream),
"chacha20-ietf": newCipherObserver(chacha20.KeySize, chacha20.NonceSize, newChaCha20Stream),
"salsa20": newCipherObserver(32, 8, newSalsa20Stream),
"camellia-128-cfb": newCipherObserver(16, 16, newCamelliaStream),
"camellia-192-cfb": newCipherObserver(24, 16, newCamelliaStream),
"camellia-256-cfb": newCipherObserver(32, 16, newCamelliaStream),
"idea-cfb": newCipherObserver(16, 8, newIdeaStream),
"rc2-cfb": newCipherObserver(16, 8, newRC2Stream),
"seed-cfb": newCipherObserver(16, 8, newSeedStream),
"rc4": newCipherObserver(16, 0, newRC4Stream),
"none": newCipherObserver(16, 0, newNoneStream),
}