# CMAC

## MAC

In order to understand *hex* and *type* parameters read [Hash](https://github.com/liesware/coherence/wiki/Hash)

### CMAC

[spec](https://csrc.nist.gov/publications/detail/sp/800-38b/archive/2005-05-01)

Description: Message authentication code based on block cipher.

Uses: When a block cipher is more readily available than a hash function

## How to ???

```python
import requests
import json
import os,binascii

def sending(message):
    url = 'http://127.0.0.1:6613/'
    response = requests.post(url, data=message)
    print response.content
    return response.content

data_js='{"version":1,"algorithm":"CMAC","type":"string","plaintext":"Hello world!",\
"hex":0,"key":"0123456789ABCDEF0123456789ABCDEF","family":"aes"}'
sending(data_js)
```

Calculate CMAC-AES to string *"Hello world!"* with the key given.

On *data\_js\["family"]* can be one of *{"aes", "rc6", "mars","serpent","twofish', "cast256"}*

Json to HMAC string

```javascript
{"version":1,"algorithm":"CMAC","type":"string","plaintext":"your string","hex":BOOL,
"key":"Hex stringsize=32-64","family":"block flavor"}
```

Json to HMAC file

```javascript
{"version":1,"algorithm":"CMAC","type":"file","file":"your file",
"key":"Hex stringsize=32-64","family":"block flavor"}
```