func AddPkcs7(data []byte, blockSize int) []byte {
	
	var paddingCount int
	
	if paddingCount = blockSize - (len(data) % blockSize);paddingCount == 0 {
		paddingCount=blockSize
	}		
	
	return append(data, bytes.Repeat([]byte{byte(paddingCount)}, paddingCount)...)
}
func AddPkcs7(data []byte, blockSize int) []byte {
	
	var paddingCount int
	
	if paddingCount = blockSize - (len(data) % blockSize);paddingCount == 0 {
		paddingCount=blockSize
	}		
	
	return append(data, bytes.Repeat([]byte{byte(paddingCount)}, paddingCount)...)
}
// AddPkcs7 pads given byte array using pkcs7 padding schema till it has blockSize length in bytes