Python-сообщество

#coding=utf-8
__author__ = 'MZC'
addition = 1337
perm_box = [3, 0, 1, 4, 2]
def permutation(data):
    data += chr(0)*((5-len(data)) % 5)
    result = ""
    for i in range(0, len(data), 5):
        for offset in perm_box:
            result += data[i+offset]
    return result
def main():
    digest = ""
    secret_str = "find_me"
    for index in range(len(secret_str)):
        sign = -1 + 2*(index % 2)
        digest += chr((ord(secret_str[index])+sign*addition)%256)
    digest = (permutation(digest).encode('hex'))
    print "Digest:", digest
if __name__ == "__main__":
    main()