/
aes.go
69 lines (59 loc) · 1.63 KB
/
aes.go
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package aes
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
)
var (
// Define aes secret key 2^5
SecretKey = []byte("2985BCFDB5FE43129843DB59825F8647")
)
func PKCS5Padding(plaintext []byte, blockSize int) []byte {
padding := blockSize - len(plaintext)%blockSize
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(plaintext, padtext...)
}
func PKCS5UnPadding(origData []byte) []byte {
length := len(origData)
unpadding := int(origData[length-1])
return origData[:(length - unpadding)]
}
func Encrypt(origData, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
origData = PKCS5Padding(origData, blockSize)
blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
crypted := make([]byte, len(origData))
blockMode.CryptBlocks(crypted, origData)
return crypted, nil
}
func EncryptToBase64(origData, key []byte) (string, error) {
crypted, err := Encrypt(origData, key)
if err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(crypted), nil
}
func Decrypt(crypted, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
origData := make([]byte, len(crypted))
blockMode.CryptBlocks(origData, crypted)
origData = PKCS5UnPadding(origData)
return origData, nil
}
func DecryptFromBase64(data string, key []byte) ([]byte, error) {
crypted, err := base64.RawURLEncoding.DecodeString(data)
if err != nil {
return nil, err
}
return Decrypt(crypted, key)
}