forked from hidevopsio/hiboot
/
aes.go
76 lines (64 loc) · 2.23 KB
/
aes.go
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// Copyright 2018 John Deng (hi.devops.io@gmail.com).
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package aes provides aes encryption/decryption utilities
package aes
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"fmt"
"hidevops.io/hiboot/pkg/utils/crypto"
"io"
)
// Encrypt string to base64 crypto using AES
func Encrypt(key []byte, text string) (retVal string, err error) {
plaintext := []byte(text)
var block cipher.Block
block, err = aes.NewCipher(key)
if err != nil {
return "", 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 {
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(cipherText[aes.BlockSize:], plaintext)
// convert to base64
retVal = base64.URLEncoding.EncodeToString(cipherText)
}
return
}
// Decrypt from base64 to decrypted string
func Decrypt(key []byte, cryptoText string) (retVal string, err error) {
cipherText, _ := base64.URLEncoding.DecodeString(cryptoText)
// 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 {
return "", crypto.ErrCipherTooShort
}
var block cipher.Block
block, err = aes.NewCipher(key)
if err != nil {
return "", err
}
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), nil
}