func fastTestConstruction() *chow.Construction {
if !isCached {
constr1, _ := testConstruction()
serialized := constr1.Serialize()
cached, _ = chow.Parse(serialized)
isCached = true
}
return &cached
}
func main() {
flag.Parse()
// Load in key data and initialize the block cipher.
keyData, err := ioutil.ReadFile(*key)
if err != nil {
panic(err)
}
block, _ := chow.Parse(keyData)
// Put block cipher in CBC mode.
iv := make([]byte, 16)
rand.Read(iv)
fmt.Printf("IV: %x\n", iv)
mode := cipher.NewCBCEncrypter(block, iv)
// Load in file to encrypt.
data, err := ioutil.ReadFile(*in)
if err != nil {
panic(err)
}
// Create and append the padding for our file.
padding := make([]byte, 16-len(data)%16)
for i, _ := range padding {
padding[i] = byte(len(padding))
}
data = append(data, padding...)
// Encrypt file.
mode.CryptBlocks(data, data)
// Write encrypted file to disk.
ioutil.WriteFile(*out, data, os.ModePerm)
fmt.Println("Done!")
}
