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func padding(src []byte,blocksize int) []byte {
	padnum:=blocksize-len(src)%blocksize
	pad:=bytes.Repeat([]byte{byte(padnum)},padnum)
	return append(src,pad...)
}
 
func unpadding(src []byte) []byte {
	n:=len(src)
	unpadnum:=int(src[n-1])
	return src[:n-unpadnum]
}
 
func encryptAES(src []byte,key []byte) []byte {
	block,_:=aes.NewCipher(key)
	src=padding(src,block.BlockSize())
	blockmode:=cipher.NewCBCEncrypter(block,key)
	blockmode.CryptBlocks(src,src)
	return src
}
 
func decryptAES(src []byte,key []byte) []byte {
	block,_:=aes.NewCipher(key)
	blockmode:=cipher.NewCBCDecrypter(block,key)
	blockmode.CryptBlocks(src,src)
	src=unpadding(src)
	return src
}