Mask generation function: Difference between revisions

Revision as of 14:35, 18 February 2017

Revision as of 14:39, 18 February 2017

Line 93:

return ''.join([chr((integer >> (8 * i)) & 0xFF) for i in reversed(range(size))])

def mgf1(input, length, digesthash=hashlib.sha1):

counter = 0

output = ''

while (len(output) < length):

C = i2osp(counter, 4)

output += digesthash(input + C).digest()

counter += 1

return output[:length]

Line 112:

>>> from binascii import hexlify

>>> from hashlib import sha256

>>> print hexlify(mgf1('foo', 3))

'1ac907'

>>> print hexlify(mgf1('foo', 5))

'1ac9075cd4'

>>> print hexlify(mgf1('bar', 5))

'bc0c655e01'

>>> print hexlify(mgf1('bar', 50))

'bc0c655e016bc2931d85a2e675181adcef7f581f76df2739da74faac41627be2f7f415c89e983fd0ce80ced9878641cb4876'

>>> print hexlify(mgf1('bar', 50, sha256))

'382576a7841021cc28fc4c0948753fb8312090cea942ea4c4e735d10dc724b155f9f6069f289d61daca0cb814502ef04eae1'

</source>