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aes.go
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/
aes.go
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package util
import (
"bytes"
"crypto/aes"
"crypto/cipher"
)
func AesEncrypt(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 AesDecrypt(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 PKCS5Padding(data []byte, blockSize int) []byte {
padding := blockSize - len(data)%blockSize
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(data, padtext...)
}
func PKCS5UnPadding(plantText []byte) []byte {
length := len(plantText)
unpadding := int(plantText[length-1])
return plantText[:(length - unpadding)]
}