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english.go
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/
english.go
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package encoders
/*
Sliver Implant Framework
Copyright (C) 2019 Bishop Fox
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import (
insecureRand "math/rand"
"strings"
)
// EnglishEncoderID - EncoderID
const EnglishEncoderID = 31
var dictionary *map[int][]string
// English Encoder - An ASCIIEncoder for binary to english text
type English struct{}
// Encode - Binary => English
func (e English) Encode(data []byte) []byte {
if dictionary == nil {
buildDictionary()
}
words := []string{}
for _, b := range data {
possibleWords := (*dictionary)[int(b)]
index := insecureRand.Intn(len(possibleWords))
words = append(words, possibleWords[index])
}
return []byte(strings.Join(words, " "))
}
// Decode - English => Binary
func (e English) Decode(words []byte) ([]byte, error) {
wordList := strings.Split(string(words), " ")
data := []byte{}
for _, word := range wordList {
word = strings.TrimSpace(word)
if len(word) == 0 {
continue
}
byteValue := sumWord(word)
data = append(data, byte(byteValue))
}
return data, nil
}
func buildDictionary() {
dictionary = &map[int][]string{}
for _, word := range getEnglishDictionary() {
word = strings.TrimSpace(word)
sum := sumWord(word)
(*dictionary)[sum] = append((*dictionary)[sum], word)
}
}
func sumWord(word string) int {
sum := 0
for _, char := range word {
sum += int(char)
}
return sum % 256
}