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1 | +++ | ||
2 | title = "Register" | ||
3 | description = "Register Documentation" | ||
4 | weight = 3 | ||
5 | +++ | ||
6 | |||
7 | POST request to `/register` endpoint | ||
8 | |||
9 | Lets a user to authenticate themselves to the system. | ||
10 | Only people who are enrolled to the class can open Gradecoin accounts. | ||
11 | This is enforced with your Student ID (e123456) and a one time password you will receive. | ||
12 | |||
13 | # Authentication Process | ||
14 | |||
15 | > The bytes you are sending over the network are all Base64 Encoded | ||
16 | |||
17 | - Gradecoin's Public Key (`gradecoin_public_key`) is listed on our Moodle page and [here](/gradecoin.pub). Download and load it it to your client. | ||
18 | - Create a JSON object (`P_AR`) with your `metu_id` ("e"+`6 chars`) and `public key` in base64 (PEM) format (`S_PK`) [reference](https://tls.mbed.org/kb/cryptography/asn1-key-structures-in-der-and-pem) | ||
19 | ```json | ||
20 | { | ||
21 | "student_id": "e123456", | ||
22 | "passwd": "15 char secret", | ||
23 | "public_key": "---BEGIN PUBLIC KEY..." | ||
24 | } | ||
25 | ``` | ||
26 | |||
27 | ## Cipher Initialization | ||
28 | |||
29 | > Since we are working with AES-128, both key and IV should be 128 bits (or 16 hexadecimal characters) | ||
30 | |||
31 | - Pick a short temporary key (`k_temp`) | ||
32 | - Pick a random IV [1](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Initialization_vector_(IV)) [2](https://en.wikipedia.org/wiki/Initialization_vector) (`iv`). | ||
33 | |||
34 | ## Encryption | ||
35 | - Encrypt the serialized string of `P_AR` with 128 bit block [AES](https://en.wikipedia.org/wiki/Initialization_vector) in [CBC](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#CBC) mode with [Pkcs7 padding](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Padding) using the temporary key (`k_temp`), the result is `C_AR`. Encode this with base64. | ||
36 | - The temporary key you have picked `k_temp` is encrypted using RSA with [OAEP](https://en.wikipedia.org/wiki/Optimal_asymmetric_encryption_padding) padding scheme using SHA-256 with `gradecoin_public_key`, giving us `key_ciphertext`. Encode this with base64. | ||
37 | - Base64 encode the IV (`iv`) as well. | ||
38 | |||
39 | {% tidbit() %} | ||
40 | The available tools and libraries might warn you about how using the primitives given above are "hazardous". They are, crypto is hard. | ||
41 | {% end %} | ||
42 | |||
43 | - The payload JSON object (`auth_request`) can be serialized now: | ||
44 | |||
45 | ```json | ||
46 | { | ||
47 | "c": "C_AR", | ||
48 | "iv": "iv", | ||
49 | "key": "key_ciphertext" | ||
50 | } | ||
51 | ``` | ||
52 | |||
53 | If your authentication process was valid, you will be given access and your public key fingerprint that is your address. | ||
54 | You can now sign [JWTs](@/JWT.md) to send authorized transaction requests. | ||