CS 4440 Wiki:
The PyMD5 Module

This module is derived from MD5C.C by RSA Data Security, Inc.

To use it, include from pymd5 import * in your Python 3 script.

Class md5(string='', state=None, count=0)

Returns a new md5 objects and processes string. Optional advanced parameters allow you to resume an earlier computation by setting the internal state of the function and the counter of message bits processed so far. Most of the interface matches Python's standard hashlib.

>>> m = md5()

Function md5.update(arg)

Updates the md5 object with the string arg. Repeated calls are equivalent to a single call with the concatenation of all the arguments.

>>> m.update("msg")

Function md5.digest()

Returns the digest of the strings passed to the update() method so far. This may contain non-ASCII characters, including NULL bytes.

>>> print(m.digest())
b'\xf2\xbc[\x1d\x86\x98p\xd7h\x8fq\xb2\xd8p0\xbd'

Function md5.hexdigest()

Like digest() but returns a string of double length, containing only hexadecimal digits.

>>> print(m.hexdigest())
f2bc5b1d869870d7688f71b2d87030bd

Function md5.digest_size

Returns the size of the resulting hash in bytes.

>>> print(m.digest_size)
16

Function md5.block_size

Returns the internal block size of the hash algorithm in bytes.

>>> print(m.block_size)
64

Function padding(msg_bits)

Given a message size (in bits), returns the number of padding bytes that should be appended to the end of a message to reach a multiple of the block size.

>>> p = pymd5.padding(8)  # 8 bits (1 byte)
>>> print(len(p))
63

>>> p = pymd5.padding(16) # 16 bits (2 bytes)
>>> print(len(p))
62