Created
January 19, 2013 20:07
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import sys | |
#KSA - Key-Scheduling Algorithm (wiki) | |
def KSA(kljuc): | |
duljina_kljuca = len(kljuc) #predstavlja broj bajtova u kljucu | |
S = range(256) #postavljanje permutacija identiteta | |
j = 0 | |
for i in range (256): | |
j = (j + S[i] + kljuc[i % duljina_kljuca]) % 256 | |
S[i], S[j] = S[j], S[i] #zamjena vrijednosti | |
return S | |
#PRGA - Pseudo-Random Generation Algorithm (wiki) | |
def PRGA(S): | |
i = 0 | |
j = 0 | |
while True: | |
i = (i + 1) % 256 | |
j = (j + S[i]) % 256 | |
S[i], S[j] = S[j], S[i] #zamjena vrijednosti | |
K = S[(S[i] + S[j]) %256] #bajt toka kljuceva | |
yield K #yield se ovdje koristi jer je pogodniji za generatore | |
def RC4(kljuc): | |
S = KSA(kljuc) | |
return PRGA(S) | |
def konverzija_kljuca(v_k): | |
return [ord(c) for c in v_k] | |
def kriptiraj(text, k): | |
kljuc = konverzija_kljuca(k) | |
tok_kljuceva = RC4(kljuc) | |
for c in text: | |
sys.stdout.write("%02X" % (ord(c) ^ tok_kljuceva.next())) | |
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