CS5833S24/aes/aes.go

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))

	fmt.Println([]byte(pt))

	// ciphertext

	fmt.Println((c))
	fmt.Println([]byte(c))

	key2 := "thisis32bitlongpassphraseimusing"

	// decrypt
	DecryptAES([]byte(key2), 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)
	}
}