not working concept

token/token.go

@@ -0,0 +1,90 @@
+package token
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"syscall"
+	"os"
+
+	"golang.org/x/term"
+)
+
+func Must[T any](v T, err error) T {
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+func Token() string {
+	hash := sha256.Sum256(Password())
+	v, err := Decrypt(string(Must(io.ReadAll(Must(os.Open("encrypted"))))), hash[:])
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+func Password() []byte {
+	print("Password: ")
+	p, err := term.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		panic(err)
+	}
+	return p
+}
+
+func Encrypt(plainText string, key []byte) (string, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
+		return "", err
+	}
+
+	ciphertext := gcm.Seal(nonce, nonce, []byte(plainText), nil)
+	return base64.StdEncoding.EncodeToString(ciphertext), nil
+}
+
+func Decrypt(cipherText string, key []byte) (string, error) {
+	ciphertext, err := base64.StdEncoding.DecodeString(cipherText)
+	if err != nil {
+		return "", err
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(ciphertext) < nonceSize {
+		return "", fmt.Errorf("ciphertext too short")
+	}
+
+	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
+	plainText, err := gcm.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		return "", err
+	}
+
+	return string(plainText), nil
+}