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symmetricencryption.go
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symmetricencryption.go
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package method
import (
"crypto/aes"
"crypto/cipher"
"errors"
"fmt"
"git.golaxy.org/core"
"git.golaxy.org/core/util/types"
"git.golaxy.org/framework/net/gtp"
"golang.org/x/crypto/chacha20"
"golang.org/x/crypto/chacha20poly1305"
)
// Cipher 对称密码算法
type Cipher interface {
// Transforming 变换数据
Transforming(dst, src, nonce []byte) (int, error)
// BlockSize block大小
BlockSize() int
// NonceSize nonce大小
NonceSize() int
// Overhead overhead大小
Overhead() int
// Pad 是否需要填充
Pad() bool
// Unpad 是否需要解除填充
Unpad() bool
// InputSize 输入大小
InputSize(size int) int
// OutputSize 输出大小
OutputSize(size int) int
}
// NewCipher 创建对称密码算法
func NewCipher(se gtp.SymmetricEncryption, bcm gtp.BlockCipherMode, key, iv []byte) (encryptor, decrypter Cipher, err error) {
switch se {
case gtp.SymmetricEncryption_AES:
block, err := NewBlock(se, key)
if err != nil {
return nil, nil, err
}
return NewBlockCipherMode(bcm, block, iv)
case gtp.SymmetricEncryption_ChaCha20, gtp.SymmetricEncryption_XChaCha20:
_encryptor, err := chacha20.NewUnauthenticatedCipher(key, iv)
if err != nil {
return nil, nil, err
}
_decrypter, err := chacha20.NewUnauthenticatedCipher(key, iv)
if err != nil {
return nil, nil, err
}
encryptor = _XORKeyStream{Stream: _encryptor}
decrypter = _XORKeyStream{Stream: _decrypter}
return encryptor, decrypter, nil
case gtp.SymmetricEncryption_ChaCha20_Poly1305:
_encryptor, err := chacha20poly1305.New(key)
if err != nil {
return nil, nil, err
}
_decrypter, err := chacha20poly1305.New(key)
if err != nil {
return nil, nil, err
}
encryptor = _AEADEncryptor{AEAD: _encryptor}
decrypter = _AEADDecrypter{AEAD: _decrypter}
return encryptor, decrypter, nil
case gtp.SymmetricEncryption_XChaCha20_Poly1305:
_encryptor, err := chacha20poly1305.NewX(key)
if err != nil {
return nil, nil, err
}
_decrypter, err := chacha20poly1305.NewX(key)
if err != nil {
return nil, nil, err
}
encryptor = _AEADEncryptor{AEAD: _encryptor}
decrypter = _AEADDecrypter{AEAD: _decrypter}
return encryptor, decrypter, nil
default:
return nil, nil, ErrInvalidMethod
}
}
// NewBlock 创建分组
func NewBlock(se gtp.SymmetricEncryption, key []byte) (block cipher.Block, err error) {
defer func() {
if panicErr := types.Panic2Err(recover()); panicErr != nil {
block = nil
err = fmt.Errorf("%w: %w", core.ErrPanicked, panicErr)
}
}()
switch se {
case gtp.SymmetricEncryption_AES:
return aes.NewCipher(key)
default:
return nil, ErrInvalidMethod
}
}
// NewBlockCipherMode 创建分组密码模式
func NewBlockCipherMode(bcm gtp.BlockCipherMode, block cipher.Block, iv []byte) (encryptor, decrypter Cipher, err error) {
defer func() {
if panicErr := types.Panic2Err(recover()); panicErr != nil {
encryptor = nil
decrypter = nil
err = fmt.Errorf("%w: %w", core.ErrPanicked, panicErr)
}
}()
switch bcm {
case gtp.BlockCipherMode_CTR:
encryptor = _XORKeyStream{Stream: cipher.NewCTR(block, iv)}
decrypter = _XORKeyStream{Stream: cipher.NewCTR(block, iv)}
return
case gtp.BlockCipherMode_CBC:
encryptor = _BlockModeEncryptor{BlockMode: cipher.NewCBCEncrypter(block, iv)}
decrypter = _BlockModeDecrypter{BlockMode: cipher.NewCBCDecrypter(block, iv)}
return
case gtp.BlockCipherMode_CFB:
encryptor = _XORKeyStream{Stream: cipher.NewCFBEncrypter(block, iv)}
decrypter = _XORKeyStream{Stream: cipher.NewCFBDecrypter(block, iv)}
return
case gtp.BlockCipherMode_OFB:
encryptor = _XORKeyStream{Stream: cipher.NewOFB(block, iv)}
decrypter = _XORKeyStream{Stream: cipher.NewOFB(block, iv)}
return
case gtp.BlockCipherMode_GCM:
mode, err := cipher.NewGCMWithNonceSize(block, block.BlockSize())
if err != nil {
return nil, nil, err
}
encryptor = _AEADEncryptor{AEAD: mode}
decrypter = _AEADDecrypter{AEAD: mode}
return encryptor, decrypter, nil
default:
return nil, nil, ErrInvalidMethod
}
}
type _XORKeyStream struct {
cipher.Stream
}
func (s _XORKeyStream) Transforming(dst, src, nonce []byte) (size int, err error) {
defer func() {
if panicErr := types.Panic2Err(recover()); panicErr != nil {
size = 0
err = fmt.Errorf("%w: %w", core.ErrPanicked, panicErr)
}
}()
s.XORKeyStream(dst, src)
return len(dst), nil
}
func (s _XORKeyStream) BlockSize() int {
return 0
}
func (s _XORKeyStream) NonceSize() int {
return 0
}
func (s _XORKeyStream) Overhead() int {
return 0
}
func (s _XORKeyStream) Pad() bool {
return false
}
func (s _XORKeyStream) Unpad() bool {
return false
}
func (s _XORKeyStream) InputSize(size int) int {
return size
}
func (s _XORKeyStream) OutputSize(size int) int {
return size
}
type _BlockModeEncryptor struct {
cipher.BlockMode
}
func (s _BlockModeEncryptor) Transforming(dst, src, nonce []byte) (size int, err error) {
defer func() {
if panicErr := types.Panic2Err(recover()); panicErr != nil {
size = 0
err = fmt.Errorf("%w: %w", core.ErrPanicked, panicErr)
}
}()
s.CryptBlocks(dst, src)
return len(dst), nil
}
func (s _BlockModeEncryptor) NonceSize() int {
return 0
}
func (s _BlockModeEncryptor) Overhead() int {
return 0
}
func (s _BlockModeEncryptor) Pad() bool {
return true
}
func (s _BlockModeEncryptor) Unpad() bool {
return false
}
func (s _BlockModeEncryptor) InputSize(size int) int {
return size + (s.BlockSize() - size%s.BlockSize())
}
func (s _BlockModeEncryptor) OutputSize(size int) int {
return size + (s.BlockSize() - size%s.BlockSize())
}
type _BlockModeDecrypter struct {
cipher.BlockMode
}
func (s _BlockModeDecrypter) Transforming(dst, src, nonce []byte) (size int, err error) {
defer func() {
if panicErr := types.Panic2Err(recover()); panicErr != nil {
size = 0
err = fmt.Errorf("%w: %w", core.ErrPanicked, panicErr)
}
}()
s.CryptBlocks(dst, src)
return len(dst), nil
}
func (s _BlockModeDecrypter) NonceSize() int {
return 0
}
func (s _BlockModeDecrypter) Overhead() int {
return 0
}
func (s _BlockModeDecrypter) Pad() bool {
return false
}
func (s _BlockModeDecrypter) Unpad() bool {
return true
}
func (s _BlockModeDecrypter) InputSize(size int) int {
return size
}
func (s _BlockModeDecrypter) OutputSize(size int) int {
return size - (s.BlockSize() - size%s.BlockSize())
}
type _AEADEncryptor struct {
cipher.AEAD
}
func (s _AEADEncryptor) Transforming(dst, src, nonce []byte) (size int, err error) {
defer func() {
if panicErr := types.Panic2Err(recover()); panicErr != nil {
size = 0
err = fmt.Errorf("%w: %w", core.ErrPanicked, panicErr)
}
}()
if len(dst) < s.OutputSize(len(src)) {
return 0, errors.New("dst too small")
}
out := s.Seal(dst[:0], nonce, src, nil)
return len(out), nil
}
func (s _AEADEncryptor) BlockSize() int {
return 0
}
func (s _AEADEncryptor) Pad() bool {
return false
}
func (s _AEADEncryptor) Unpad() bool {
return false
}
func (s _AEADEncryptor) InputSize(size int) int {
return size
}
func (s _AEADEncryptor) OutputSize(size int) int {
return size + s.Overhead()
}
type _AEADDecrypter struct {
cipher.AEAD
}
func (s _AEADDecrypter) Transforming(dst, src, nonce []byte) (size int, err error) {
defer func() {
if panicErr := types.Panic2Err(recover()); panicErr != nil {
size = 0
err = fmt.Errorf("%w: %w", core.ErrPanicked, panicErr)
}
}()
if len(dst) < s.OutputSize(len(src)) {
return 0, errors.New("dst too small")
}
var out []byte
out, err = s.Open(dst[:0], nonce, src, nil)
return len(out), err
}
func (s _AEADDecrypter) BlockSize() int {
return 0
}
func (s _AEADDecrypter) Pad() bool {
return false
}
func (s _AEADDecrypter) Unpad() bool {
return false
}
func (s _AEADDecrypter) InputSize(size int) int {
return size
}
func (s _AEADDecrypter) OutputSize(size int) int {
return size - s.Overhead()
}