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update kcp-go package

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This commit is contained in:
fatedier
2019-03-17 17:09:54 +08:00
parent 87a4de4370
commit fdcdccb0c2
122 changed files with 14490 additions and 2469 deletions
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601
vendor/github.com/fatedier/kcp-go/crypt.go generated vendored
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@@ -57,8 +57,8 @@ func (c *salsa20BlockCrypt) Decrypt(dst, src []byte) {
}
type sm4BlockCrypt struct {
encbuf []byte
decbuf []byte
encbuf [sm4.BlockSize]byte
decbuf [2 * sm4.BlockSize]byte
block cipher.Block
}
@@ -70,17 +70,15 @@ func NewSM4BlockCrypt(key []byte) (BlockCrypt, error) {
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) }
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
encbuf [twofish.BlockSize]byte
decbuf [2 * twofish.BlockSize]byte
block cipher.Block
}
@@ -92,17 +90,15 @@ func NewTwofishBlockCrypt(key []byte) (BlockCrypt, error) {
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) }
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
encbuf [des.BlockSize]byte
decbuf [2 * des.BlockSize]byte
block cipher.Block
}
@@ -114,17 +110,15 @@ func NewTripleDESBlockCrypt(key []byte) (BlockCrypt, error) {
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) }
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
encbuf [cast5.BlockSize]byte
decbuf [2 * cast5.BlockSize]byte
block cipher.Block
}
@@ -136,17 +130,15 @@ func NewCast5BlockCrypt(key []byte) (BlockCrypt, error) {
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) }
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
encbuf [blowfish.BlockSize]byte
decbuf [2 * blowfish.BlockSize]byte
block cipher.Block
}
@@ -158,17 +150,15 @@ func NewBlowfishBlockCrypt(key []byte) (BlockCrypt, error) {
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) }
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
encbuf [aes.BlockSize]byte
decbuf [2 * aes.BlockSize]byte
block cipher.Block
}
@@ -180,17 +170,15 @@ func NewAESBlockCrypt(key []byte) (BlockCrypt, error) {
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) }
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
encbuf [tea.BlockSize]byte
decbuf [2 * tea.BlockSize]byte
block cipher.Block
}
@@ -202,17 +190,15 @@ func NewTEABlockCrypt(key []byte) (BlockCrypt, error) {
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) }
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
encbuf [xtea.BlockSize]byte
decbuf [2 * xtea.BlockSize]byte
block cipher.Block
}
@@ -224,13 +210,11 @@ func NewXTEABlockCrypt(key []byte) (BlockCrypt, error) {
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) }
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
@@ -258,31 +242,544 @@ 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) {
switch block.BlockSize() {
case 8:
encrypt8(block, dst, src, buf)
case 16:
encrypt16(block, dst, src, buf)
default:
encryptVariant(block, dst, src, buf)
}
}
// optimized encryption for the ciphers which works in 8-bytes
func encrypt8(block cipher.Block, dst, src, buf []byte) {
tbl := buf[:8]
block.Encrypt(tbl, initialVector)
n := len(src) / 8
base := 0
repeat := n / 8
left := n % 8
for i := 0; i < repeat; i++ {
s := src[base:][0:64]
d := dst[base:][0:64]
// 1
xor.BytesSrc1(d[0:8], s[0:8], tbl)
block.Encrypt(tbl, d[0:8])
// 2
xor.BytesSrc1(d[8:16], s[8:16], tbl)
block.Encrypt(tbl, d[8:16])
// 3
xor.BytesSrc1(d[16:24], s[16:24], tbl)
block.Encrypt(tbl, d[16:24])
// 4
xor.BytesSrc1(d[24:32], s[24:32], tbl)
block.Encrypt(tbl, d[24:32])
// 5
xor.BytesSrc1(d[32:40], s[32:40], tbl)
block.Encrypt(tbl, d[32:40])
// 6
xor.BytesSrc1(d[40:48], s[40:48], tbl)
block.Encrypt(tbl, d[40:48])
// 7
xor.BytesSrc1(d[48:56], s[48:56], tbl)
block.Encrypt(tbl, d[48:56])
// 8
xor.BytesSrc1(d[56:64], s[56:64], tbl)
block.Encrypt(tbl, d[56:64])
base += 64
}
switch left {
case 7:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 8
fallthrough
case 6:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 8
fallthrough
case 5:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 8
fallthrough
case 4:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 8
fallthrough
case 3:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 8
fallthrough
case 2:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 8
fallthrough
case 1:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 8
fallthrough
case 0:
xor.BytesSrc0(dst[base:], src[base:], tbl)
}
}
// optimized encryption for the ciphers which works in 16-bytes
func encrypt16(block cipher.Block, dst, src, buf []byte) {
tbl := buf[:16]
block.Encrypt(tbl, initialVector)
n := len(src) / 16
base := 0
repeat := n / 8
left := n % 8
for i := 0; i < repeat; i++ {
s := src[base:][0:128]
d := dst[base:][0:128]
// 1
xor.BytesSrc1(d[0:16], s[0:16], tbl)
block.Encrypt(tbl, d[0:16])
// 2
xor.BytesSrc1(d[16:32], s[16:32], tbl)
block.Encrypt(tbl, d[16:32])
// 3
xor.BytesSrc1(d[32:48], s[32:48], tbl)
block.Encrypt(tbl, d[32:48])
// 4
xor.BytesSrc1(d[48:64], s[48:64], tbl)
block.Encrypt(tbl, d[48:64])
// 5
xor.BytesSrc1(d[64:80], s[64:80], tbl)
block.Encrypt(tbl, d[64:80])
// 6
xor.BytesSrc1(d[80:96], s[80:96], tbl)
block.Encrypt(tbl, d[80:96])
// 7
xor.BytesSrc1(d[96:112], s[96:112], tbl)
block.Encrypt(tbl, d[96:112])
// 8
xor.BytesSrc1(d[112:128], s[112:128], tbl)
block.Encrypt(tbl, d[112:128])
base += 128
}
switch left {
case 7:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 16
fallthrough
case 6:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 16
fallthrough
case 5:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 16
fallthrough
case 4:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 16
fallthrough
case 3:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 16
fallthrough
case 2:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 16
fallthrough
case 1:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += 16
fallthrough
case 0:
xor.BytesSrc0(dst[base:], src[base:], tbl)
}
}
func encryptVariant(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++ {
repeat := n / 8
left := n % 8
for i := 0; i < repeat; i++ {
// 1
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
// 2
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
// 3
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
// 4
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
// 5
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
// 6
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
// 7
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
// 8
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
}
xor.BytesSrc0(dst[base:], src[base:], tbl)
switch left {
case 7:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
fallthrough
case 6:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
fallthrough
case 5:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
fallthrough
case 4:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
fallthrough
case 3:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
fallthrough
case 2:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
fallthrough
case 1:
xor.BytesSrc1(dst[base:], src[base:], tbl)
block.Encrypt(tbl, dst[base:])
base += blocksize
fallthrough
case 0:
xor.BytesSrc0(dst[base:], src[base:], tbl)
}
}
// decryption
func decrypt(block cipher.Block, dst, src, buf []byte) {
switch block.BlockSize() {
case 8:
decrypt8(block, dst, src, buf)
case 16:
decrypt16(block, dst, src, buf)
default:
decryptVariant(block, dst, src, buf)
}
}
func decrypt8(block cipher.Block, dst, src, buf []byte) {
tbl := buf[0:8]
next := buf[8:16]
block.Encrypt(tbl, initialVector)
n := len(src) / 8
base := 0
repeat := n / 8
left := n % 8
for i := 0; i < repeat; i++ {
s := src[base:][0:64]
d := dst[base:][0:64]
// 1
block.Encrypt(next, s[0:8])
xor.BytesSrc1(d[0:8], s[0:8], tbl)
// 2
block.Encrypt(tbl, s[8:16])
xor.BytesSrc1(d[8:16], s[8:16], next)
// 3
block.Encrypt(next, s[16:24])
xor.BytesSrc1(d[16:24], s[16:24], tbl)
// 4
block.Encrypt(tbl, s[24:32])
xor.BytesSrc1(d[24:32], s[24:32], next)
// 5
block.Encrypt(next, s[32:40])
xor.BytesSrc1(d[32:40], s[32:40], tbl)
// 6
block.Encrypt(tbl, s[40:48])
xor.BytesSrc1(d[40:48], s[40:48], next)
// 7
block.Encrypt(next, s[48:56])
xor.BytesSrc1(d[48:56], s[48:56], tbl)
// 8
block.Encrypt(tbl, s[56:64])
xor.BytesSrc1(d[56:64], s[56:64], next)
base += 64
}
switch left {
case 7:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 8
fallthrough
case 6:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 8
fallthrough
case 5:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 8
fallthrough
case 4:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 8
fallthrough
case 3:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 8
fallthrough
case 2:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 8
fallthrough
case 1:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 8
fallthrough
case 0:
xor.BytesSrc0(dst[base:], src[base:], tbl)
}
}
func decrypt16(block cipher.Block, dst, src, buf []byte) {
tbl := buf[0:16]
next := buf[16:32]
block.Encrypt(tbl, initialVector)
n := len(src) / 16
base := 0
repeat := n / 8
left := n % 8
for i := 0; i < repeat; i++ {
s := src[base:][0:128]
d := dst[base:][0:128]
// 1
block.Encrypt(next, s[0:16])
xor.BytesSrc1(d[0:16], s[0:16], tbl)
// 2
block.Encrypt(tbl, s[16:32])
xor.BytesSrc1(d[16:32], s[16:32], next)
// 3
block.Encrypt(next, s[32:48])
xor.BytesSrc1(d[32:48], s[32:48], tbl)
// 4
block.Encrypt(tbl, s[48:64])
xor.BytesSrc1(d[48:64], s[48:64], next)
// 5
block.Encrypt(next, s[64:80])
xor.BytesSrc1(d[64:80], s[64:80], tbl)
// 6
block.Encrypt(tbl, s[80:96])
xor.BytesSrc1(d[80:96], s[80:96], next)
// 7
block.Encrypt(next, s[96:112])
xor.BytesSrc1(d[96:112], s[96:112], tbl)
// 8
block.Encrypt(tbl, s[112:128])
xor.BytesSrc1(d[112:128], s[112:128], next)
base += 128
}
switch left {
case 7:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 16
fallthrough
case 6:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 16
fallthrough
case 5:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 16
fallthrough
case 4:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 16
fallthrough
case 3:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 16
fallthrough
case 2:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 16
fallthrough
case 1:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += 16
fallthrough
case 0:
xor.BytesSrc0(dst[base:], src[base:], tbl)
}
}
func decryptVariant(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++ {
repeat := n / 8
left := n % 8
for i := 0; i < repeat; i++ {
// 1
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
base += blocksize
// 2
block.Encrypt(tbl, src[base:])
xor.BytesSrc1(dst[base:], src[base:], next)
base += blocksize
// 3
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
base += blocksize
// 4
block.Encrypt(tbl, src[base:])
xor.BytesSrc1(dst[base:], src[base:], next)
base += blocksize
// 5
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
base += blocksize
// 6
block.Encrypt(tbl, src[base:])
xor.BytesSrc1(dst[base:], src[base:], next)
base += blocksize
// 7
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
base += blocksize
// 8
block.Encrypt(tbl, src[base:])
xor.BytesSrc1(dst[base:], src[base:], next)
base += blocksize
}
switch left {
case 7:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += blocksize
fallthrough
case 6:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += blocksize
fallthrough
case 5:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += blocksize
fallthrough
case 4:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += blocksize
fallthrough
case 3:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += blocksize
fallthrough
case 2:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += blocksize
fallthrough
case 1:
block.Encrypt(next, src[base:])
xor.BytesSrc1(dst[base:], src[base:], tbl)
tbl, next = next, tbl
base += blocksize
fallthrough
case 0:
xor.BytesSrc0(dst[base:], src[base:], tbl)
}
xor.BytesSrc0(dst[base:], src[base:], tbl)
}