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Vigenere Cypther
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import base64 | |
def encode(key, string) | |
encoded_chars = [] | |
for i in xrange(len(string)): | |
key_c = key[i % len(key)] | |
encoded_c = chr(ord(string[i]) + ord(key_c) % 256) | |
encoded_chars.append(encoded_c) | |
encoded_string = "".join(encoded_chars) | |
return base64.urlsafe_b64encode(encoded_string) | |
def decode(key, string): | |
decoded_chars = [] | |
string = base64.urlsafe_b64decode(string) | |
for i in xrange(len(string)): | |
key_c = key[i % len(key)] | |
encoded_c = chr(abs(ord(string[i]) - ord(key_c) % 256)) | |
decoded_chars.append(encoded_c) | |
decoded_string = "".join(decoded_chars) | |
return decoded_string |
Modulo operator (%
) has higher precedence than either +
or -
, so line 8 is missing parens:
encoded_c = chr( (ord(string[i]) + ord(key_c)) % 256)
Ditto line 19.
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You're missing a colon on line 4.
def encode(key, string)
should bedef encode(key, string):
.