golang aes encryption

Restu Wahyu Saputra answered on April 8, 2022 Popularity 6/10 Helpfulness 3/10

answer golang aes encryption

related golang aes encryption example

golang aes encryption

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package main

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"encoding/hex"
	"errors"
	"fmt"
	"log"

	"golang.org/x/crypto/scrypt"
)

var (
	key []byte
	err error
)

func init() {
	secretKey := "2a688bc3f0e8ec1431402e9e4a1fb563"

	if len(secretKey) != 32 {
		err = errors.New("Secretkey length miss match")
	}

	key, err = scrypt.Key([]byte(secretKey), []byte("salt"), 1024, 8, 1, 32)
	if err != nil {
		log.Fatal(err)
	}
}

func AES256Encrypt(data string) ([]byte, error) {
	if err != nil {
		return nil, err
	}

	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}

	gcm, err := cipher.NewGCM(block)
	if err != nil {
		return nil, err
	}

	nonce := make([]byte, gcm.NonceSize())
	if _, err = rand.Read(nonce); err != nil {
		return nil, err
	}

	ciphertext := gcm.Seal(nonce, nonce, []byte(data), nil)
	return ciphertext, nil
}

func AES256Decrypt(cipherText []byte) ([]byte, error) {
	if err != nil {
		return nil, err
	}

	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}

	gcm, err := cipher.NewGCM(block)
	if err != nil {
		return nil, err
	}

	nonceSize := gcm.NonceSize()
	if len(cipherText) < nonceSize {
		return nil, errors.New("Ciphertext too short")
	}

	nonce, ciphertext := cipherText[:nonceSize], cipherText[nonceSize:]
	plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
	if err != nil {
		return nil, err
	}

	return plaintext, nil
}

func main() {
	data := "Hello Wordl!"

	enc, err := AES256Encrypt(data)
	if err != nil {
		log.Fatal(err)
	}

	dec, err := AES256Decrypt(enc)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("Cipher: ", hex.EncodeToString(enc))
	fmt.Println("Cipher Text: ", string(dec))
}

Popularity 6/10 Helpfulness 3/10 Language go

Source: Grepper

Tags: aes encryption go

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Contributed on Apr 04 2024

Restu Wahyu Saputra

0 Answers Avg Quality 2/10

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golang aes encryption example

Comment

package main

import (
	"crypto/aes"
	"encoding/hex"
	"fmt"
)

func main() {

	// cipher key
	key := "thisis32bitlongpassphraseimusing"

	// plaintext
	pt := "This is a secret"

	c := EncryptAES([]byte(key), pt)

	// plaintext
	fmt.Println(pt)

	// ciphertext
	fmt.Println(c)

	// decrypt
	DecryptAES([]byte(key), c)
}

func EncryptAES(key []byte, plaintext string) string {

	c, err := aes.NewCipher(key)
	CheckError(err)

	out := make([]byte, len(plaintext))

	c.Encrypt(out, []byte(plaintext))

	return hex.EncodeToString(out)
}

func DecryptAES(key []byte, ct string) {
	ciphertext, _ := hex.DecodeString(ct)

	c, err := aes.NewCipher(key)
	CheckError(err)

	pt := make([]byte, len(ciphertext))
	c.Decrypt(pt, ciphertext)

	s := string(pt[:])
	fmt.Println("DECRYPTED:", s)
}

func CheckError(err error) {
	if err != nil {
		panic(err)
	}
}

Popularity 8/10 Helpfulness 8/10 Language go

Source: golangdocs.com

Tags: encryption aes go encryp

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Contributed on Apr 08 2022

Restu Wahyu Saputra

0 Answers Avg Quality 2/10

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