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- # ===================================================================
- #
- # Copyright (c) 2014, Legrandin <helderijs@gmail.com>
- # All rights reserved.
- #
- # Redistribution and use in source and binary forms, with or without
- # modification, are permitted provided that the following conditions
- # are met:
- #
- # 1. Redistributions of source code must retain the above copyright
- # notice, this list of conditions and the following disclaimer.
- # 2. Redistributions in binary form must reproduce the above copyright
- # notice, this list of conditions and the following disclaimer in
- # the documentation and/or other materials provided with the
- # distribution.
- #
- # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- # POSSIBILITY OF SUCH DAMAGE.
- # ===================================================================
- """
- MD4 is specified in RFC1320_ and produces the 128 bit digest of a message.
- >>> from tls.Crypto.Hash import MD4
- >>>
- >>> h = MD4.new()
- >>> h.update(b'Hello')
- >>> print h.hexdigest()
- MD4 stand for Message Digest version 4, and it was invented by Rivest in 1990.
- This algorithm is insecure. Do not use it for new designs.
- .. _RFC1320: http://tools.ietf.org/html/rfc1320
- """
- from tls.Crypto.Util.py3compat import bord
- from tls.Crypto.Util._raw_api import (load_pycryptodome_raw_lib,
- VoidPointer, SmartPointer,
- create_string_buffer,
- get_raw_buffer, c_size_t,
- c_uint8_ptr)
- _raw_md4_lib = load_pycryptodome_raw_lib(
- "Crypto.Hash._MD4",
- """
- int md4_init(void **shaState);
- int md4_destroy(void *shaState);
- int md4_update(void *hs,
- const uint8_t *buf,
- size_t len);
- int md4_digest(const void *shaState,
- uint8_t digest[20]);
- int md4_copy(const void *src, void *dst);
- """)
- class MD4Hash(object):
- """Class that implements an MD4 hash
- """
- #: 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 = "1.2.840.113549.2.4"
- def __init__(self, data=None):
- state = VoidPointer()
- result = _raw_md4_lib.md4_init(state.address_of())
- if result:
- raise ValueError("Error %d while instantiating MD4"
- % result)
- self._state = SmartPointer(state.get(),
- _raw_md4_lib.md4_destroy)
- if data:
- self.update(data)
- def update(self, data):
- """Continue hashing of a message by consuming the next chunk of data.
- Repeated calls are equivalent to a single call with the concatenation
- of all the arguments. In other words:
- >>> m.update(a); m.update(b)
- is equivalent to:
- >>> m.update(a+b)
- :Parameters:
- data : byte string/byte array/memoryview
- The next chunk of the message being hashed.
- """
- result = _raw_md4_lib.md4_update(self._state.get(),
- c_uint8_ptr(data),
- c_size_t(len(data)))
- if result:
- raise ValueError("Error %d while instantiating MD4"
- % result)
- def digest(self):
- """Return the **binary** (non-printable) digest of the message that
- has been hashed so far.
- This method does not change the state of the hash object.
- You can continue updating the object after calling this function.
- :Return: A byte string of `digest_size` bytes. It may contain non-ASCII
- characters, including null bytes.
- """
- bfr = create_string_buffer(self.digest_size)
- result = _raw_md4_lib.md4_digest(self._state.get(),
- bfr)
- if result:
- raise ValueError("Error %d while instantiating MD4"
- % result)
- return get_raw_buffer(bfr)
- def hexdigest(self):
- """Return the **printable** digest of the message that has been
- hashed so far.
- This method does not change the state of the hash object.
- :Return: A string of 2* `digest_size` characters. It contains only
- hexadecimal ASCII digits.
- """
- 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 = MD4Hash()
- result = _raw_md4_lib.md4_copy(self._state.get(),
- clone._state.get())
- if result:
- raise ValueError("Error %d while copying MD4" % result)
- return clone
- def new(self, data=None):
- return MD4Hash(data)
- def new(data=None):
- """Return a fresh instance of the hash object.
- :Parameters:
- data : byte string/byte array/memoryview
- The very first chunk of the message to hash.
- It is equivalent to an early call to `MD4Hash.update()`.
- Optional.
- :Return: A `MD4Hash` object
- """
- return MD4Hash().new(data)
- #: The size of the resulting hash in bytes.
- digest_size = MD4Hash.digest_size
- #: The internal block size of the hash algorithm in bytes.
- block_size = MD4Hash.block_size
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