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| Current File : //proc/thread-self/root/usr/local/lib/python3.8/dist-packages/pdfminer/arcfour.py |
#!/usr/bin/env python
""" Python implementation of Arcfour encryption algorithm.
This code is in the public domain.
"""
## Arcfour
##
class Arcfour:
"""
>>> Arcfour(b'Key').process(b'Plaintext').hex()
'bbf316e8d940af0ad3'
>>> Arcfour(b'Wiki').process(b'pedia').hex()
'1021bf0420'
>>> Arcfour(b'Secret').process(b'Attack at dawn').hex()
'45a01f645fc35b383552544b9bf5'
"""
def __init__(self, key):
s = list(range(256))
j = 0
klen = len(key)
for i in range(256):
j = (j + s[i] + key[i % klen]) % 256
(s[i], s[j]) = (s[j], s[i])
self.s = s
(self.i, self.j) = (0, 0)
return
def process(self, data):
(i, j) = (self.i, self.j)
s = self.s
r = []
for c in data:
i = (i+1) % 256
j = (j+s[i]) % 256
(s[i], s[j]) = (s[j], s[i])
k = s[(s[i]+s[j]) % 256]
r.append(c ^ k)
(self.i, self.j) = (i, j)
return bytes(r)
encrypt = decrypt = process
new = Arcfour
# test
if __name__ == '__main__':
import doctest
print('pdfminer.arcfour:', doctest.testmod())