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Removed safebit stuff as it breaks in certain situations. Will look a…
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…t it later.
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sybrenstuvel committed Jul 10, 2011
1 parent 5f6d9e2 commit 3f8c551
Showing 1 changed file with 5 additions and 5 deletions.
10 changes: 5 additions & 5 deletions rsa/core.py
Expand Up @@ -6,7 +6,7 @@

import types

import rsa.common
#import rsa.common

def encrypt_int(message, ekey, n):
"""Encrypts a message using encryption key 'ekey', working modulo n"""
Expand All @@ -24,8 +24,8 @@ def encrypt_int(message, ekey, n):
raise OverflowError("The message %i is too long for n=%i" % (message, n))

#Note: Bit exponents start at zero (bit counts start at 1) this is correct
safebit = rsa.common.bit_size(n) - 2 # compute safe bit (MSB - 1)
message += (1 << safebit) # add safebit to ensure folding
# safebit = rsa.common.bit_size(n) - 2 # compute safe bit (MSB - 1)
# message += (1 << safebit) # add safebit to ensure folding

return pow(message, ekey, n)

Expand All @@ -35,8 +35,8 @@ def decrypt_int(cyphertext, dkey, n):

message = pow(cyphertext, dkey, n)

safebit = rsa.common.bit_size(n) - 2 # compute safe bit (MSB - 1)
message -= (1 << safebit) # remove safebit before decode
# safebit = rsa.common.bit_size(n) - 2 # compute safe bit (MSB - 1)
# message -= (1 << safebit) # remove safebit before decode

return message

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