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main.go
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main.go
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package main
import (
"crypto/aes"
"crypto/cipher"
"crypto/md5"
"crypto/rand"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"os"
)
func createHash(key string) string {
hasher := md5.New()
hasher.Write([]byte(key))
return hex.EncodeToString(hasher.Sum(nil))
}
func encrypt(data []byte, passphrase string) []byte {
block, _ := aes.NewCipher([]byte(createHash(passphrase)))
gcm, err := cipher.NewGCM(block)
if err != nil {
panic(err.Error())
}
nonce := make([]byte, gcm.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
panic(err.Error())
}
ciphertext := gcm.Seal(nonce, nonce, data, nil)
return ciphertext
}
func decrypt(data []byte, passphrase string) []byte {
key := []byte(createHash(passphrase))
block, err := aes.NewCipher(key)
if err != nil {
panic(err.Error())
}
gcm, err := cipher.NewGCM(block)
if err != nil {
panic(err.Error())
}
nonceSize := gcm.NonceSize()
nonce, ciphertext := data[:nonceSize], data[nonceSize:]
plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
panic(err.Error())
}
return plaintext
}
func encryptFile(filename string, data []byte, passphrase string) {
f, _ := os.Create(filename)
defer f.Close()
f.Write(encrypt(data, passphrase))
}
func decryptFile(filename string, passphrase string) []byte {
data, _ := ioutil.ReadFile(filename)
return decrypt(data, passphrase)
}
func main() {
fmt.Println("Initializing...")
sampleInput := "input"
samplePassphrase := "password"
ciphertext := encrypt([]byte(sampleInput), samplePassphrase)
fmt.Printf("Encrypted: %x\n", ciphertext)
plaintext := decrypt(ciphertext, samplePassphrase)
fmt.Printf("Decrypted: %s\n", plaintext)
sampleFile := "example.txt"
encryptFile(sampleFile, []byte(sampleInput), samplePassphrase)
fmt.Println("File contents after decryption: ", string(decryptFile(sampleFile, samplePassphrase)))
}