184 lines
6.5 KiB
Python
184 lines
6.5 KiB
Python
# -*- 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,
|
|
c_uint8_ptr)
|
|
|
|
_raw_md5_lib = load_pycryptodome_raw_lib("Cryptodome.Hash._MD5",
|
|
"""
|
|
#define MD5_DIGEST_SIZE 16
|
|
|
|
int MD5_init(void **shaState);
|
|
int MD5_destroy(void *shaState);
|
|
int MD5_update(void *hs,
|
|
const uint8_t *buf,
|
|
size_t len);
|
|
int MD5_digest(const void *shaState,
|
|
uint8_t digest[MD5_DIGEST_SIZE]);
|
|
int MD5_copy(const void *src, void *dst);
|
|
|
|
int MD5_pbkdf2_hmac_assist(const void *inner,
|
|
const void *outer,
|
|
const uint8_t first_digest[MD5_DIGEST_SIZE],
|
|
uint8_t final_digest[MD5_DIGEST_SIZE],
|
|
size_t iterations);
|
|
""")
|
|
|
|
class MD5Hash(object):
|
|
"""A MD5 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 = 16
|
|
# The internal block size of the hash algorithm in bytes.
|
|
block_size = 64
|
|
# ASN.1 Object ID
|
|
oid = "1.2.840.113549.2.5"
|
|
|
|
def __init__(self, data=None):
|
|
state = VoidPointer()
|
|
result = _raw_md5_lib.MD5_init(state.address_of())
|
|
if result:
|
|
raise ValueError("Error %d while instantiating MD5"
|
|
% result)
|
|
self._state = SmartPointer(state.get(),
|
|
_raw_md5_lib.MD5_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/byte array/memoryview): The next chunk of the message being hashed.
|
|
"""
|
|
|
|
result = _raw_md5_lib.MD5_update(self._state.get(),
|
|
c_uint8_ptr(data),
|
|
c_size_t(len(data)))
|
|
if result:
|
|
raise ValueError("Error %d while instantiating MD5"
|
|
% 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_md5_lib.MD5_digest(self._state.get(),
|
|
bfr)
|
|
if result:
|
|
raise ValueError("Error %d while instantiating MD5"
|
|
% 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 = MD5Hash()
|
|
result = _raw_md5_lib.MD5_copy(self._state.get(),
|
|
clone._state.get())
|
|
if result:
|
|
raise ValueError("Error %d while copying MD5" % result)
|
|
return clone
|
|
|
|
def new(self, data=None):
|
|
"""Create a fresh SHA-1 hash object."""
|
|
|
|
return MD5Hash(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:`MD5Hash.update`.
|
|
:type data: byte string/byte array/memoryview
|
|
|
|
:Return: A :class:`MD5Hash` hash object
|
|
"""
|
|
return MD5Hash().new(data)
|
|
|
|
# The size of the resulting hash in bytes.
|
|
digest_size = 16
|
|
|
|
# The internal block size of the hash algorithm in bytes.
|
|
block_size = 64
|
|
|
|
|
|
def _pbkdf2_hmac_assist(inner, outer, first_digest, iterations):
|
|
"""Compute the expensive inner loop in PBKDF-HMAC."""
|
|
|
|
assert len(first_digest) == digest_size
|
|
assert iterations > 0
|
|
|
|
bfr = create_string_buffer(digest_size);
|
|
result = _raw_md5_lib.MD5_pbkdf2_hmac_assist(
|
|
inner._state.get(),
|
|
outer._state.get(),
|
|
first_digest,
|
|
bfr,
|
|
c_size_t(iterations))
|
|
|
|
if result:
|
|
raise ValueError("Error %d with PBKDF2-HMAC assis for MD5" % result)
|
|
|
|
return get_raw_buffer(bfr)
|