コード例 #1
0
func edit(ct []byte, offset int, text []byte) {
	block, err := aes.NewCipher(key)
	if err != nil {
		fmt.Println(err)
	}
	t := make([]byte, len(ct))
	util.CTREncrypt(block, nonce, t, ct)
	for i := offset; i < offset+len(text) && i < len(t); i++ {
		t[i] = text[i-offset]
	}
	util.CTREncrypt(block, nonce, ct, t)
}
コード例 #2
0
func main() {
	encoded := util.ReadFile("25.txt")
	bytes, err := base64.StdEncoding.DecodeString(string(encoded))
	if err != nil {
		log.Fatal(err)
	}
	oldAes, err := aes.NewCipher([]byte("YELLOW SUBMARINE"))
	if err != nil {
		log.Fatal(err)
	}
	util.ECBDecrypt(oldAes, bytes, bytes)
	// we have plaintext in bytes

	// encrypt it in CTR mode
	block, err := aes.NewCipher(key)
	if err != nil {
		log.Fatal(err)
	}
	util.CTREncrypt(block, nonce, bytes, bytes)

	// save the copy
	ct := make([]byte, len(bytes))
	copy(ct, bytes)

	// let's prepare sequence of 0 bytes and replace the text with it
	zeroes := make([]byte, len(bytes))
	edit(bytes, 0, zeroes)
	// result in bytes contains the key
	// let's recover the original plain text:
	for i := 0; i < len(ct); i++ {
		bytes[i] = ct[i] ^ bytes[i]
	}
	fmt.Println(string(bytes))
}
コード例 #3
0
func isAdmin(ct []byte) bool {
	block, _ := aes.NewCipher(key)
	res := make([]byte, len(ct))
	copy(res, ct)
	util.CTREncrypt(block, nonce, res, res)
	fmt.Println("isAdmin peek:", string(res))
	return bytes.Count(res, []byte(";admin=true;")) > 0
}
コード例 #4
0
func init() {
	scan := bufio.NewScanner(os.Stdin)
	block, _ := aes.NewCipher(key)
	for scan.Scan() {
		t, _ := base64.StdEncoding.DecodeString(scan.Text())
		util.CTREncrypt(block, nonce, t, t)
		fmt.Println(len(t), hex.EncodeToString(t))
		cts = append(cts, t)
	}
	fmt.Println("ciphertexts:", len(cts))
}
コード例 #5
0
func crypt(userdata []byte) []byte {
	res := bytes.Replace(userdata, []byte("="), []byte("%3D"), -1)
	res = bytes.Replace(res, []byte(";"), []byte("%3B"), -1)
	res = append(prefix, res...)
	res = append(res, postfix...)
	block, _ := aes.NewCipher(key)
	res = util.PadTo(res, 16)
	fmt.Println("crypt peek:", string(res))
	util.CTREncrypt(block, nonce, res, res)
	return res
}
コード例 #6
0
func init() {
	scan := bufio.NewScanner(os.Stdin)
	block, _ := aes.NewCipher(key)
	minLen = 999999
	for scan.Scan() {
		t, _ := base64.StdEncoding.DecodeString(scan.Text())
		util.CTREncrypt(block, nonce, t, t)
		if len(t) < minLen {
			minLen = len(t)
		}
		cts = append(cts, t)
	}
}
コード例 #7
0
func main() {
	s, _ := base64.StdEncoding.DecodeString("L77na/nrFsKvynd6HzOoG7GHTLXsTVu9qvY/2syLXzhPweyyMTJULu/6/kXX0KSvoOLSFQ==")
	block, _ := aes.NewCipher([]byte("YELLOW SUBMARINE"))
	util.CTREncrypt(block, make([]byte, 16), s, s)
	fmt.Println(string(s))
}