97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
package shttp
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/rand"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
)
|
|
|
|
// AESKey generates a random 32 byte AES Key
|
|
func AESKey() string {
|
|
bytes := make([]byte, 32) //generate a random 32 byte key for AES-256
|
|
if _, err := rand.Read(bytes); err != nil {
|
|
fmt.Println(err)
|
|
os.Exit(1)
|
|
}
|
|
return hex.EncodeToString(bytes)
|
|
}
|
|
|
|
// EncryptAESByte use system dynamic key if keyString = ""
|
|
func EncryptAESByte(ByteToEncrypt []byte, keyString string) ([]byte, error) {
|
|
if keyString == "" {
|
|
keyString = AESKey()
|
|
}
|
|
//Since the key is in string, we need to convert decode it to bytes
|
|
key, _ := hex.DecodeString(keyString)
|
|
|
|
//Create a new Cipher Block from the key
|
|
block, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
//Create a new GCM
|
|
aesGCM, err := cipher.NewGCM(block)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
//Create a nonce. Nonce should be from GCM
|
|
nonce := make([]byte, aesGCM.NonceSize())
|
|
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
//Encrypt the data using aesGCM.Seal
|
|
//Since we don't want to save the nonce somewhere else in this case, we add it as a prefix to the encrypted data. The first nonce argument in Seal is the prefix.
|
|
return aesGCM.Seal(nonce, nonce, ByteToEncrypt, nil), nil
|
|
}
|
|
|
|
func EncryptAES(stringToEncrypt string, keyString string) (string, error) {
|
|
ciphertext, err := EncryptAESByte([]byte(stringToEncrypt), keyString)
|
|
return hex.EncodeToString(ciphertext), err
|
|
}
|
|
|
|
// DecryptAESByte use system dynamic key if keyString = ""
|
|
func DecryptAESByte(encrypted []byte, keyString string) ([]byte, error) {
|
|
if keyString == "" {
|
|
keyString = AESKey()
|
|
}
|
|
key, _ := hex.DecodeString(keyString)
|
|
|
|
//Create a new Cipher Block from the key
|
|
block, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
//Create a new GCM
|
|
aesGCM, err := cipher.NewGCM(block)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
//Get the nonce size
|
|
nonceSize := aesGCM.NonceSize()
|
|
|
|
//Extract the nonce from the encrypted data
|
|
nonce, ciphertext := encrypted[:nonceSize], encrypted[nonceSize:]
|
|
|
|
//Decrypt the data
|
|
return aesGCM.Open(nil, nonce, ciphertext, nil)
|
|
}
|
|
|
|
func DecryptAES(encryptedString string, keyString string) (string, error) {
|
|
encrypted, err := hex.DecodeString(encryptedString)
|
|
if err != nil {
|
|
panic(err.Error())
|
|
}
|
|
decrypted, err := DecryptAESByte(encrypted, keyString)
|
|
return string(decrypted), err
|
|
|
|
}
|