In today's digital age, managing passwords efficiently and securely is crucial. Building a password vault can help store multiple passwords securely. This guide will walk through creating a simple password vault using the Go programming language. We will cover setting up a basic command-line application, securing passwords with encryption, and ensuring data integrity.
Getting Started
Create a new directory for your project and initialize a new Go module:
mkdir gopassvault
cd gopassvault
go mod init gopassvaultBasic Command-Line Application
We'll start by setting up a basic command-line application that can accept user inputs for storing and retrieving passwords.
package main
import (
"fmt"
"os"
)
func main() {
if len(os.Args) < 2 {
fmt.Println("Usage: gopassvault command")
return
}
command := os.Args[1]
switch command {
case "set":
// will handle set command
case "get":
// will handle get command
default:
fmt.Println("Unknown command")
}
}Securing Passwords with Encryption
To secure passwords, we'll use AES encryption from the built-in crypto package. AES (Advanced Encryption Standard) is strong enough to keep your passwords safe if managed correctly.
package main
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/hex"
"io"
)
func encrypt(plaintext string, key []byte) (ciphertext string, err error) {
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
aesGCM, err := cipher.NewGCM(block)
if err != nil {
return "", err
}
nonce := make([]byte, aesGCM.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
return "", err
}
encrypted := aesGCM.Seal(nonce, nonce, []byte(plaintext), nil)
return hex.EncodeToString(encrypted), nil
}The encryption function takes plaintext and a key, then returns the ciphertext. Note that managing the key securely is crucial, and it should never be hard-coded into your application.
Data Storage and Management
For simplicity, we will store encrypted passwords in a local file. A more robust solution could involve using a database.
package main
import (
"bufio"
"fmt"
"os"
)
func savePassword(filename, account, encryptedPassword string) error {
file, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return err
}
defer file.Close()
writer := bufio.NewWriter(file)
_, err = writer.WriteString(fmt.Sprintf("%s:%s\n", account, encryptedPassword))
if err != nil {
return err
}
return writer.Flush()
}The savePassword function writes the encrypted password to a file, associating it with a specific account identifier.
Final Considerations
Building a secure password vault involves careful handling of encryption, key management, and data storage. While this guide provides a starting point, consider adopting additional security measures such as using a dedicated encryption library, integrating environment-specific key storage solutions like AWS KMS, or seeking security audit services.
