123 lines
2.9 KiB
Python
123 lines
2.9 KiB
Python
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import sys
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import hashlib
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def unicode(text):
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if sys.version_info < (3, 0):
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import __builtin__
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return __builtin__.unicode(text)
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return str(text)
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def bytes(text):
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"""
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Convert Unicode text to UTF-8 encoded bytes.
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Since Python 2.6+ and Python 3+ have similar but incompatible
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signatures, this function unifies the two to keep code sane.
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:param text: Unicode text to convert to bytes
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:rtype: bytes (Python3), str (Python2.6+)
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"""
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if sys.version_info < (3, 0):
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import __builtin__
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return __builtin__.bytes(text)
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else:
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import builtins
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if isinstance(text, builtins.bytes):
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# We already have bytes, so do nothing
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return text
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if isinstance(text, list):
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# Convert a list of integers to bytes
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return builtins.bytes(text)
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else:
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# Convert UTF-8 text to bytes
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return builtins.bytes(text, encoding='utf-8')
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def quote(text):
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"""
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Enclose in quotes and escape internal slashes and double quotes.
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:param text: A Unicode or byte string.
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"""
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text = bytes(text)
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return b'"' + text.replace(b'\\', b'\\\\').replace(b'"', b'\\"') + b'"'
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def num_to_bytes(num):
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"""
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Convert an integer into a four byte sequence.
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:param integer num: An integer to convert to its byte representation.
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"""
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bval = b''
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bval += bytes(chr(0xFF & (num >> 24)))
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bval += bytes(chr(0xFF & (num >> 16)))
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bval += bytes(chr(0xFF & (num >> 8)))
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bval += bytes(chr(0xFF & (num >> 0)))
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return bval
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def bytes_to_num(bval):
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"""
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Convert a four byte sequence to an integer.
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:param bytes bval: A four byte sequence to turn into an integer.
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"""
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num = 0
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num += ord(bval[0] << 24)
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num += ord(bval[1] << 16)
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num += ord(bval[2] << 8)
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num += ord(bval[3])
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return num
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def XOR(x, y):
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"""
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Return the results of an XOR operation on two equal length byte strings.
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:param bytes x: A byte string
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:param bytes y: A byte string
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:rtype: bytes
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"""
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result = b''
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for a, b in zip(x, y):
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if sys.version_info < (3, 0):
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result += chr((ord(a) ^ ord(b)))
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else:
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result += bytes([a ^ b])
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return result
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def hash(name):
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"""
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Return a hash function implementing the given algorithm.
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:param name: The name of the hashing algorithm to use.
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:type name: string
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:rtype: function
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"""
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name = name.lower()
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if name.startswith('sha-'):
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name = 'sha' + name[4:]
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if name in dir(hashlib):
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return getattr(hashlib, name)
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return None
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def hashes():
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"""
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Return a list of available hashing algorithms.
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:rtype: list of strings
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"""
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t = []
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if 'md5' in dir(hashlib):
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t = ['MD5']
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if 'md2' in dir(hashlib):
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t += ['MD2']
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hashes = ['SHA-' + h[3:] for h in dir(hashlib) if h.startswith('sha')]
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return t + hashes
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