Stream-ciphers

eStream
​eStream project​
​Stream ciphers video - 1 ​
​Stream ciphers video - 2 ​
In order to understand hex and type parameters read HASH​
Sosemanuk
​spec​
Description: Stream cipher and eStream winner.
Uses: Performance is very impportant.
Key size: from 128 to 256 bits, guaranteed security is only 128 bits.
Iv size: 128 bits
Salsa20
​spec​
Description: Stream cipher and eStream winner.
Uses: Performance is very impportant.
Key size: varibale
Iv size: 64 bits
How to ???
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import requests
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import json
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import os,binascii
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​
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def sending(message):
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    url = 'http://127.0.0.1:6613/'
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    response = requests.post(url, data=message)
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    print response.content
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    return response.content
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​
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def stream(data_js):
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    req=json.loads(data_js)
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    print "Sosemanuk enc \n " + json.dumps(req) +"\n"
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    data_js_n=sending(json.dumps(req))
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    answ=json.loads(data_js_n)
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    print "Recived enc: \n" + (json.dumps(answ)) +"\n\n\n"
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    dec='{"algorithm":"SOSEMANUK","plaintext":"","iv":"b05691ef92cb9c9bf77e5613819fc4ea",\
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    "version":1,"key":"7f685ba92789f0d8d421038f2b1b4fcd73be586d81795ec3ab7939975b7b896e","operation":"dec","type":"string"}'
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    req=json.loads(dec)
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    req["plaintext"]=answ["result"]
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    print "Sosemanuk dec \n " + json.dumps(req) +"\n"
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    data_js_n=sending(json.dumps(req))
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    answ2=json.loads(data_js_n)
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    print "Recived dec: \n" + (json.dumps(answ2)) +"\n\n\n"
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​
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data_js='{"algorithm":"SOSEMANUK","plaintext":"Hello world!","hex":0,"iv":"b05691ef92cb9c9bf77e5613819fc4ea",\
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"version":1,"key":"7f685ba92789f0d8d421038f2b1b4fcd73be586d81795ec3ab7939975b7b896e","operation":"enc","type":"string"}'
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stream(data_js)
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In this example we encrypt and decrypt Hello world! string with the key and iv given
On data_js["algorithm"] can be SOSEMANUK or SALSA20
Json to enc string (key and iv depends on algorithm you chose)
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{"algorithm":"estream flavor","plaintext":"your string","hex": BOOL,"iv":"Hex stringsize=16,32",
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"version":1,"key":"Hex stringsize=32-64","operation":"enc","type":"string"}
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Json to dec string (key and iv depends on algorithm you chose)
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{"algorithm":"estream flavor","plaintext":"your hex enc string ","iv":"Hex stringsize=16,32",
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"version":1,"key":"Hex stringsize=32-64","operation":"dec","type":"string"}
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Json to enc file (key and iv depends on algorithm you chose)
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{"algorithm":"estream flavor","file":"your file","iv":"Hex stringsize=16,32",
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"version":1,"key":"Hex stringsize=32-64","operation":"enc","type":"file"}
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Json to dec file (key and iv depends on algorithm you chose)
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{"algorithm":"estream flavor","file":"your file","iv":"Hex stringsize=16,32",
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"version":1,"key":"Hex stringsize=32-64","operation":"dec","type":"file"}
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Poly1305
Block-ciphers
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