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aes.go
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aes.go
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// Copyright 2023 Deflinhec
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package auxlib
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"fmt"
"io"
"strings"
lua "github.com/yuin/gopher-lua"
)
var (
Ase256LibName = "ase256"
)
var ase256Funcs = map[string]lua.LGFunction{
"encrypt": ase256Encrypt,
"decrypt": aes256Decrypt,
}
func OpenAes256(l *lua.LState) int {
mod := l.RegisterModule(Ase256LibName, ase256Funcs)
l.Push(mod)
return 1
}
func ase256Encrypt(l *lua.LState) int {
return aesEncrypt(l, 32)
}
func aes256Decrypt(l *lua.LState) int {
return aesDecrypt(l, 32)
}
var (
Ase128LibName = "ase128"
)
var ase128Funcs = map[string]lua.LGFunction{
"encrypt": ase128Encrypt,
"decrypt": ase128Decrypt,
}
func OpenAes128(l *lua.LState) int {
mod := l.RegisterModule(Ase128LibName, ase128Funcs)
l.Push(mod)
return 1
}
func ase128Encrypt(l *lua.LState) int {
return aesEncrypt(l, 16)
}
func ase128Decrypt(l *lua.LState) int {
return aesDecrypt(l, 16)
}
// Not annotated as not exported and available in the Lua runtime
func aesEncrypt(l *lua.LState, keySize int) int {
input := l.CheckString(1)
if input == "" {
l.ArgError(1, "expects string")
return 0
}
key := l.CheckString(2)
if len(key) != keySize {
l.ArgError(2, fmt.Sprintf("expects key %v bytes long", keySize))
return 0
}
// Pad string up to length multiple of 4 if needed.
if maybePad := len(input) % 4; maybePad != 0 {
input += strings.Repeat(" ", 4-maybePad)
}
block, err := aes.NewCipher([]byte(key))
if err != nil {
l.RaiseError("error creating cipher block: %v", err.Error())
return 0
}
cipherText := make([]byte, aes.BlockSize+len(input))
iv := cipherText[:aes.BlockSize]
if _, err = io.ReadFull(rand.Reader, iv); err != nil {
l.RaiseError("error getting iv: %v", err.Error())
return 0
}
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(cipherText[aes.BlockSize:], []byte(input))
l.Push(lua.LString(cipherText))
return 1
}
// Not annotated as not exported and available in the Lua runtime
func aesDecrypt(l *lua.LState, keySize int) int {
input := l.CheckString(1)
if input == "" {
l.ArgError(1, "expects string")
return 0
}
key := l.CheckString(2)
if len(key) != keySize {
l.ArgError(2, fmt.Sprintf("expects key %v bytes long", keySize))
return 0
}
if len(input) < aes.BlockSize {
l.RaiseError("input too short")
return 0
}
block, err := aes.NewCipher([]byte(key))
if err != nil {
l.RaiseError("error creating cipher block: %v", err.Error())
return 0
}
cipherText := []byte(input)
iv := cipherText[:aes.BlockSize]
cipherText = cipherText[aes.BlockSize:]
stream := cipher.NewCFBDecrypter(block, iv)
stream.XORKeyStream(cipherText, cipherText)
l.Push(lua.LString(cipherText))
return 1
}