/usr/lib/python3/dist-packages/Cryptodome/Hash/SHA512.py is in python3-pycryptodome 3.4.7-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | # -*- coding: utf-8 -*-
#
# ===================================================================
# The contents of this file are dedicated to the public domain. To
# the extent that dedication to the public domain is not available,
# everyone is granted a worldwide, perpetual, royalty-free,
# non-exclusive license to exercise all rights associated with the
# contents of this file for any purpose whatsoever.
# No rights are reserved.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# ===================================================================
from Cryptodome.Util.py3compat import *
from Cryptodome.Util._raw_api import (load_pycryptodome_raw_lib,
VoidPointer, SmartPointer,
create_string_buffer,
get_raw_buffer, c_size_t,
expect_byte_string)
_raw_sha512_lib = load_pycryptodome_raw_lib("Cryptodome.Hash._SHA512",
"""
int SHA512_init(void **shaState);
int SHA512_destroy(void *shaState);
int SHA512_update(void *hs,
const uint8_t *buf,
size_t len);
int SHA512_digest(const void *shaState,
uint8_t digest[64]);
int SHA512_copy(const void *src, void *dst);
""")
class SHA512Hash(object):
"""A SHA-512 hash object.
Do not instantiate directly. Use the :func:`new` function.
:ivar oid: ASN.1 Object ID
:vartype oid: string
:ivar block_size: the size in bytes of the internal message block,
input to the compression function
:vartype block_size: integer
:ivar digest_size: the size in bytes of the resulting hash
:vartype digest_size: integer
"""
# The size of the resulting hash in bytes.
digest_size = 64
# The internal block size of the hash algorithm in bytes.
block_size = 128
# ASN.1 Object ID
oid = "2.16.840.1.101.3.4.2.3"
def __init__(self, data=None):
state = VoidPointer()
result = _raw_sha512_lib.SHA512_init(state.address_of())
if result:
raise ValueError("Error %d while instantiating SHA512"
% result)
self._state = SmartPointer(state.get(),
_raw_sha512_lib.SHA512_destroy)
if data:
self.update(data)
def update(self, data):
"""Continue hashing of a message by consuming the next chunk of data.
Args:
data (byte string): The next chunk of the message being hashed.
"""
expect_byte_string(data)
result = _raw_sha512_lib.SHA512_update(self._state.get(),
data,
c_size_t(len(data)))
if result:
raise ValueError("Error %d while instantiating SHA512"
% result)
def digest(self):
"""Return the **binary** (non-printable) digest of the message that has been hashed so far.
:return: The hash digest, computed over the data processed so far.
Binary form.
:rtype: byte string
"""
bfr = create_string_buffer(self.digest_size)
result = _raw_sha512_lib.SHA512_digest(self._state.get(),
bfr)
if result:
raise ValueError("Error %d while instantiating SHA512"
% result)
return get_raw_buffer(bfr)
def hexdigest(self):
"""Return the **printable** digest of the message that has been hashed so far.
:return: The hash digest, computed over the data processed so far.
Hexadecimal encoded.
:rtype: string
"""
return "".join(["%02x" % bord(x) for x in self.digest()])
def copy(self):
"""Return a copy ("clone") of the hash object.
The copy will have the same internal state as the original hash
object.
This can be used to efficiently compute the digests of strings that
share a common initial substring.
:return: A hash object of the same type
"""
clone = SHA512Hash()
result = _raw_sha512_lib.SHA512_copy(self._state.get(),
clone._state.get())
if result:
raise ValueError("Error %d while copying SHA512" % result)
return clone
def new(self, data=None):
"""Create a fresh SHA-512 hash object."""
return SHA512Hash(data)
def new(data=None):
"""Create a new hash object.
:parameter data:
Optional. The very first chunk of the message to hash.
It is equivalent to an early call to :meth:`SHA512Hash.update`.
:type data: byte string
:Return: A :class:`SHA512Hash` hash object
"""
return SHA512Hash().new(data)
# The size of the resulting hash in bytes.
digest_size = SHA512Hash.digest_size
# The internal block size of the hash algorithm in bytes.
block_size = SHA512Hash.block_size
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