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utils.go
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utils.go
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package codec
import (
"crypto/cipher"
"errors"
"fmt"
"github.com/yaklang/yaklang/common/gmsm/sm4"
"strconv"
)
var (
CBC = "CBC"
ECB = "ECB"
CFB = "CFB"
OFB = "OFB"
CTR = "CTR"
)
var PKCS7Padding = sm4.PKCS7Padding
var PKCS7UnPadding = sm4.PKCS7UnPadding
func PKCS7PaddingFor8ByteBlock(src []byte) []byte {
return PKCS5Padding(src, 8)
}
func PKCS7UnPaddingFor8ByteBlock(src []byte) []byte {
return PKCS5UnPadding(src)
}
func FixIV(iv, key []byte, blockSize int) []byte {
if iv == nil && len(key) >= blockSize { // iv is nil, use key as iv
iv = key[:blockSize]
}
if len(iv) > blockSize { // iv is too long, truncate it
iv = iv[:blockSize]
}
return ZeroPadding(iv, blockSize)
}
func BlockCheck(iv, data []byte, blockSize int) error {
if len(iv) != blockSize {
return errors.New("check iv length: invalid iv size " + strconv.Itoa(len(iv)))
}
if len(data)%blockSize != 0 {
return errors.New("check data length: invalid data size " + strconv.Itoa(len(data)))
}
return nil
}
func CBCEncode(c cipher.Block, iv, data []byte) ([]byte, error) {
if err := BlockCheck(iv, data, c.BlockSize()); err != nil {
return nil, err
}
out := make([]byte, len(data))
encrypter := cipher.NewCBCEncrypter(c, iv)
encrypter.CryptBlocks(out, data)
return out, nil
}
func CBCDecode(c cipher.Block, iv, data []byte) ([]byte, error) {
if err := BlockCheck(iv, data, c.BlockSize()); err != nil {
return nil, err
}
out := make([]byte, len(data))
decrypter := cipher.NewCBCDecrypter(c, iv)
decrypter.CryptBlocks(out, data)
return out, nil
}
func CFBEncode(c cipher.Block, iv, data []byte) ([]byte, error) {
if err := BlockCheck(iv, data, c.BlockSize()); err != nil {
return nil, err
}
out := make([]byte, len(data))
encrypter := cipher.NewCFBEncrypter(c, iv)
encrypter.XORKeyStream(out, data)
return out, nil
}
func CFBDecode(c cipher.Block, iv, data []byte) ([]byte, error) {
if err := BlockCheck(iv, data, c.BlockSize()); err != nil {
return nil, err
}
out := make([]byte, len(data))
decrypter := cipher.NewCFBDecrypter(c, iv)
decrypter.XORKeyStream(out, data)
return out, nil
}
func ECBEncode(c cipher.Block, data []byte) ([]byte, error) {
blockSize := c.BlockSize()
if len(data)%blockSize != 0 {
return nil, fmt.Errorf("check data length: invalid data size %d, need %d", len(data), blockSize)
}
out := make([]byte, len(data))
for i := 0; i < len(data)/blockSize; i++ {
in_tmp := data[i*blockSize : i*blockSize+blockSize]
out_tmp := make([]byte, blockSize)
c.Encrypt(out_tmp, in_tmp)
copy(out[i*blockSize:i*blockSize+blockSize], out_tmp)
}
return out, nil
}
func ECBDecode(c cipher.Block, data []byte) ([]byte, error) {
blockSize := c.BlockSize()
if len(data)%blockSize != 0 {
return nil, fmt.Errorf("check data length: invalid data size %d, need %d", len(data), blockSize)
}
out := make([]byte, len(data))
for i := 0; i < len(data)/blockSize; i++ {
in_tmp := data[i*blockSize : i*blockSize+blockSize]
out_tmp := make([]byte, blockSize)
c.Decrypt(out_tmp, in_tmp)
copy(out[i*blockSize:i*blockSize+blockSize], out_tmp)
}
return out, nil
}
func OFBEncode(c cipher.Block, iv, data []byte) ([]byte, error) {
if err := BlockCheck(iv, data, c.BlockSize()); err != nil {
return nil, err
}
out := make([]byte, len(data))
encrypter := cipher.NewOFB(c, iv)
encrypter.XORKeyStream(out, data)
return out, nil
}
func OFBDecode(c cipher.Block, iv, data []byte) ([]byte, error) {
if err := BlockCheck(iv, data, c.BlockSize()); err != nil {
return nil, err
}
out := make([]byte, len(data))
decrypter := cipher.NewOFB(c, iv)
decrypter.XORKeyStream(out, data)
return out, nil
}
func CTREncode(c cipher.Block, iv, data []byte) ([]byte, error) {
if err := BlockCheck(iv, data, c.BlockSize()); err != nil {
return nil, err
}
out := make([]byte, len(data))
encrypter := cipher.NewCTR(c, iv)
encrypter.XORKeyStream(out, data)
return out, nil
}
func CTRDecode(c cipher.Block, iv, data []byte) ([]byte, error) {
if err := BlockCheck(iv, data, c.BlockSize()); err != nil {
return nil, err
}
out := make([]byte, len(data))
decrypter := cipher.NewCTR(c, iv)
decrypter.XORKeyStream(out, data)
return out, nil
}
type EncodedFunc func(any) string