# Curve-25519

[Why?](https://safecurves.cr.yp.to/)

[spec](https://cr.yp.to/ecdh/curve25519-20060209.pdf)

Description: Public-key cryptosystem

Problem: Discrete logarithm problem

Uses: Digital signatures and Key exchange

* It only supports "type":"string"

## How to Ed25519?

```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

def ed25519(data_js):
    req=json.loads(data_js)
    print "Send gen parameters : \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ=json.loads(data_js_n)
    print "Recived  ed25519 gen: \n"+(json.dumps(answ)) +"\n\n\n"
    json_s=json_v='{ "version": 1 , "algorithm":"ED25519", "type":"string","plaintext": "Hello world!", "hex":0,"privkey": "" ,"operation":"sign"}'
    req=json.loads(json_s)
    req["privkey"]=answ["privkey"]
    print "Send sign : \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ_1=json.loads(data_js_n)
    print "Recived  sign done: \n"+(json.dumps(answ_1)) +"\n\n\n"
    json_v='{ "version": 1 , "algorithm":"ED25519", "type":"string","plaintext": "Hello world!", "hex":0,"pubkey": "" ,"sign":"","operation":"verify"}'
    req=json.loads(json_v)
    req["pubkey"]=answ["pubkey"]
    req["sign"]=answ_1["sign"]
    print "Send verify : \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ_2=json.loads(data_js_n)
    print "Recived  verify done: \n"+(json.dumps(answ_2)) +"\n\n\n"

ed25519_gen='{ "version": 1 , "algorithm":"ED25519", "operation":"gen"}'
ed25519(ed25519_gen)
```

Json to gen

```javascript
{"operation": "gen", "version": 1, "algorithm": "ED25519"}
```

Json to sign

```javascript
{"algorithm": "ED25519", "plaintext": "your string", "hex": BOOL, "version": 1, "operation": "sign", 
"type": "string", "privkey": "your hex privkey"}
```

Json to verify

```javascript
{"algorithm": "ED25519", "plaintext": "Hello world!", "pubkey": "your hex pubkey", "hex": BOOL, 
"sign": "your hex signature", "version": 1, "operation": "verify", "type": "string"}
```

## How to X25519?

```python
import socket
import json
import os,binascii

def sending(message):
    ip = '127.0.0.1'
    port = 6613
    BUFFER_SIZE = 65536
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((ip, port))
    s.send(message)
    data = s.recv(BUFFER_SIZE)
    s.close()
    return data

def x25519():
    x25519_gen='{ "version": 1 , "algorithm":"X25519", "operation":"gen"}'
    req=json.loads(x25519_gen)
    print "Send gen parameters (A): \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ=json.loads(data_js_n)
    print "Recived gen parameters donde (A): \n" + (json.dumps(answ)) +"\n\n\n"
    data_js_n=sending(json.dumps(req))
    print "Send gen parameters (B): \n " + json.dumps(req) +"\n"
    answ_1=json.loads(data_js_n)
    print "Recived gen parameters donde (B): \n" + (json.dumps(answ_1)) +"\n\n\n"
    agree='{ "version":1 , "algorithm":"X25519", "privkey":"","sharedpub":"", "operation":"agree"}'
    req=json.loads(agree)
    req["privkey"]=answ["privkey"]
    req["sharedpub"]=answ_1["pubkey"]
    print "Send agreetment (A): \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ_2=json.loads(data_js_n)
    print "Recived agreetment donde (A): \n" + (json.dumps(answ_2)) +"\n\n\n"
    req["privkey"]=answ_1["privkey"]
    req["sharedpub"]=answ["pubkey"]
    print "Send agreetment (B): \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ_3=json.loads(data_js_n)
    print "Recived agreetment donde (B): \n" + (json.dumps(answ_3)) +"\n\n\n"

x25519()
```

Json to gen

```javascript
{"operation": "gen", "version": 1, "algorithm": "X25519"}
```

Json to agree

```javascript
{"operation": "agree", "version": 1, "sharedpub": "your partnert hex pubkey", 
"algorithm": "X25519", "privkey": "your hex privkey"}
```


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