[Php] Tentative de décryptage d'un xor

[Luxerails]

Non ça ne me dérange pas du tout ^^ Je viens de finir la version python, toujours mieux que le php :p

Code :

def breakxor(c, lenkey):
        c2, i = [], 0
        while i < len(c):
                c2.append(c[i:i + lenkey])
                i += lenkey
        a = ['' for i in xrange(lenkey)]
        for i in xrange(lenkey):
                for j in xrange(len(c2)):
                        a[i] += c2[j][i]
        plaintext = []
        abc = [l for l in 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzéèà .']
        key = ''
        for col in a:
                p = {}
                for k in xrange(256):
                        d = ''.join([chr(ord(l) ^ k) for l in col])
                        count = 0
                        for w in d:
                                try:
                                        tmp = abc.index(w)
                                        count += 1
                                except: pass
                        p[d + chr(k)] = count
                tmp = [k for k, v in p.iteritems() if v == max(p.values())][0]
                plaintext.append(tmp[0:-1])
                key += tmp[-1]
        strout = ''
        for j in xrange(len(plaintext[0])):
                for i in xrange(lenkey):
                        strout += plaintext[i][j]
        return (strout, key)

L'algo est très simple, mais il s'en sort plutôt bien sur de longs textes. Si vous avez des remarques à faire...