def final(self, output=True):
"""Return hashed data as bytestring.
`output` is primarily for internal use. It should only be False
if you have a clear reason for doing so.
This function can be called as either ``final`` or ``digest``.
"""
self.tf.tweak[1] |= bigint(0x8000000000000000) # SKEIN_T1_FLAG_FINAL
buflen = len(self.buf)
self.buf += zero_bytes[:64 - buflen]
self._process_block(self.buf, buflen)
if not output:
hash_val = words2bytes(self.tf.key)
else:
hash_val = empty_bytes
self.buf = zero_bytes[:]
key = self.tf.key[:] # temporary copy
i = 0
while i * 64 < self.digest_size:
self.buf = words_format[1].pack(i) + self.buf[8:]
self.tf.tweak = [0, self.block_type['out_final']]
self._process_block(self.buf, 8)
n = self.digest_size - i * 64
if n >= 64:
n = 64
hash_val += words2bytes(self.tf.key)[0:n]
self.tf.key = key
i += 1
return hash_val
def final(self, output=True):
"""Return hashed data as bytestring.
`output` is primarily for internal use. It should only be False
if you have a clear reason for doing so.
This function can be called as either ``final`` or ``digest``.
"""
self.tf.tweak[1] |= bigint(0x8000000000000000) # SKEIN_T1_FLAG_FINAL
buflen = len(self.buf)
self.buf += zero_bytes[:64-buflen]
self._process_block(self.buf, buflen)
if not output:
hash_val = words2bytes(self.tf.key)
else:
hash_val = empty_bytes
self.buf = zero_bytes[:]
key = self.tf.key[:] # temporary copy
i=0
while i*64 < self.digest_size:
self.buf = words_format[1].pack(i) + self.buf[8:]
self.tf.tweak = [0, self.block_type['out_final']]
self._process_block(self.buf, 8)
n = self.digest_size - i*64
if n >= 64:
n = 64
hash_val += words2bytes(self.tf.key)[0:n]
self.tf.key = key
i+=1
return hash_val
def getbytes(self, request_bytes):
"""Return random bytestring of length `request_bytes`."""
self.digest_size = 64 + request_bytes
self.update(words2bytes(self.tf.key))
output = self.final()
self.tf.key = bytes2words(output[0:64])
return output[64:]
def getbytes(self, request_bytes):
"""Return random bytestring of length `request_bytes`."""
self.digest_size = 64 + request_bytes
self.update(words2bytes(self.tf.key))
output = self.final()
self.tf.key = bytes2words(output[0:64])
return output[64:]
def __init__(self, msg='', digest_bits=512, key=None, block_type='msg'):
self.tf = Threefish512()
if key:
self.digest_bits = 512
self._start_new_type('key')
self.update(key)
self.tf.key = bytes2words(self.final(False))
self.digest_bits = digest_bits
self.digest_size = (digest_bits + 7) >> 3
self._start_new_type('cfg_final')
b = words2bytes((0x133414853, digest_bits, 0, 0, 0, 0, 0, 0))
self._process_block(b, 32)
self._start_new_type(block_type)
if msg:
self.update(msg)
def __init__(self, msg='', digest_bits=512, key=None,
block_type='msg'):
self.tf = Threefish512()
if key:
self.digest_bits = 512
self._start_new_type('key')
self.update(key)
self.tf.key = bytes2words(self.final(False))
self.digest_bits = digest_bits
self.digest_size = (digest_bits + 7) >> 3
self._start_new_type('cfg_final')
b = words2bytes((0x133414853,digest_bits,0,0,0,0,0,0))
self._process_block(b,32)
self._start_new_type(block_type)
if msg:
self.update(msg)
def reseed(self, seed):
"""(Re)seed the generator."""
self.digest_size = 64
self.update(words2bytes(self.tf.key) + seed)
self.tf.key = bytes2words(self.final())
def reseed(self, seed):
"""(Re)seed the generator."""
self.digest_size = 64
self.update(words2bytes(self.tf.key) + seed)
self.tf.key = bytes2words(self.final())
