/
main.go
112 lines (97 loc) · 2.31 KB
/
main.go
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package main
import (
"bytes"
"crypto/cipher"
"crypto/rand"
"encoding/hex"
"flag"
"fmt"
"golang.org/x/crypto/pbkdf2"
"io"
"log"
"os"
"github.com/RyuaNerin/go-krypto/lea"
"github.com/RyuaNerin/go-krypto/lsh256"
)
var (
dec = flag.Bool("d", false, "Decrypt instead Encrypt.")
file = flag.String("f", "", "Target file. ('-' for STDIN)")
iter = flag.Int("i", 1024, "Iterations. (for PBKDF2)")
key = flag.String("k", "", "256-bit key to Encrypt/Decrypt.")
pbkdf = flag.String("p", "", "Password-based key derivation function2.")
random = flag.Bool("r", false, "Generate random 256-bit cryptographic key.")
salt = flag.String("s", "", "Salt. (for PBKDF2)")
)
func main() {
flag.Parse()
if len(os.Args) < 2 {
fmt.Println("LEA-GCM Encryption Tool - ALBANESE Lab (c) 2020-2021")
fmt.Println("Lightweight Encryption Algorithm in Galois/Counter Mode\n")
fmt.Println("Usage of", os.Args[0]+":")
flag.PrintDefaults()
os.Exit(1)
}
if *random == true {
var key []byte
var err error
key = make([]byte, 32)
_, err = io.ReadFull(rand.Reader, key)
if err != nil {
log.Fatal(err)
}
fmt.Println(hex.EncodeToString(key))
os.Exit(0)
}
var keyHex string
var prvRaw []byte
if *pbkdf != "" {
prvRaw = pbkdf2.Key([]byte(*pbkdf), []byte(*salt), *iter, 32, lsh256.New)
keyHex = hex.EncodeToString(prvRaw)
} else {
keyHex = *key
}
var key []byte
var err error
if keyHex == "" {
key = make([]byte, 32)
_, err = io.ReadFull(rand.Reader, key)
if err != nil {
log.Fatal(err)
}
fmt.Fprintln(os.Stderr, "Key=", hex.EncodeToString(key))
} else {
key, err = hex.DecodeString(keyHex)
if err != nil {
log.Fatal(err)
}
if len(key) != 32 {
log.Fatal(err)
}
}
buf := bytes.NewBuffer(nil)
var data io.Reader
if *file == "-" {
data = os.Stdin
} else {
data, _ = os.Open(*file)
}
io.Copy(buf, data)
msg := buf.Bytes()
c, _ := lea.NewCipher(key)
aead, _ := cipher.NewGCM(c)
if *dec == false {
nonce := make([]byte, aead.NonceSize(), aead.NonceSize()+len(msg)+aead.Overhead())
out := aead.Seal(nonce, nonce, msg, nil)
fmt.Printf("%s", out)
os.Exit(0)
}
if *dec == true {
nonce, msg := msg[:aead.NonceSize()], msg[aead.NonceSize():]
out, err := aead.Open(nil, nonce, msg, nil)
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s", out)
os.Exit(0)
}
}