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A quick example of basic AES encryption using the Golang AES library.
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| package main | |
| import ( | |
| "crypto/aes" | |
| "crypto/cipher" | |
| "crypto/rand" | |
| "encoding/base64" | |
| "fmt" | |
| "io" | |
| ) | |
| func main() { | |
| originalText := "encrypt this golang" | |
| fmt.Println(originalText) | |
| key := []byte("example key 1234") | |
| // encrypt value to base64 | |
| cryptoText := encrypt(key, originalText) | |
| fmt.Println(cryptoText) | |
| // encrypt base64 crypto to original value | |
| text := decrypt(key, cryptoText) | |
| fmt.Printf(text) | |
| } | |
| // encrypt string to base64 crypto using AES | |
| func encrypt(key []byte, text string) string { | |
| // key := []byte(keyText) | |
| plaintext := []byte(text) | |
| block, err := aes.NewCipher(key) | |
| if err != nil { | |
| panic(err) | |
| } | |
| // The IV needs to be unique, but not secure. Therefore it's common to | |
| // include it at the beginning of the ciphertext. | |
| ciphertext := make([]byte, aes.BlockSize+len(plaintext)) | |
| iv := ciphertext[:aes.BlockSize] | |
| if _, err := io.ReadFull(rand.Reader, iv); err != nil { | |
| panic(err) | |
| } | |
| stream := cipher.NewCFBEncrypter(block, iv) | |
| stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext) | |
| // convert to base64 | |
| return base64.URLEncoding.EncodeToString(ciphertext) | |
| } | |
| // decrypt from base64 to decrypted string | |
| func decrypt(key []byte, cryptoText string) string { | |
| ciphertext, _ := base64.URLEncoding.DecodeString(cryptoText) | |
| block, err := aes.NewCipher(key) | |
| if err != nil { | |
| panic(err) | |
| } | |
| // The IV needs to be unique, but not secure. Therefore it's common to | |
| // include it at the beginning of the ciphertext. | |
| if len(ciphertext) < aes.BlockSize { | |
| panic("ciphertext too short") | |
| } | |
| iv := ciphertext[:aes.BlockSize] | |
| ciphertext = ciphertext[aes.BlockSize:] | |
| stream := cipher.NewCFBDecrypter(block, iv) | |
| // XORKeyStream can work in-place if the two arguments are the same. | |
| stream.XORKeyStream(ciphertext, ciphertext) | |
| return fmt.Sprintf("%s", ciphertext) | |
| } |
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