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Normally, the initial key value is determined at random using a cryptographically strong random number generator An HMAC object, h, has the following methods:
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hupdate(msg)
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Adds the string msg to the HMAC object
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hdigest()
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Returns the digest of all data processed so far and returns a byte string containing the digest valueThe length of the string depends on the underlying hashing function For MD5, it is 16 characters; for SHA-1, it is 20 characters
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hhexdigest()
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Returns the digest as a string of hexadecimal digits
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hcopy()
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Makes a copy of the HMAC object
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The primary use of the hmac module is in applications that need to authenticate the sender of a messageTo do this, the key parameter to new() is a byte string representing a secret key known by both the sender and receiver of a messageWhen sending a message, the sender will create a new HMAC object with the given key, update the object with message data to be sent, and then send the message data along with the resulting HMAC digest value to the receiverThe receiver can verify the message by computing its own HMAC digest value (using the same key and message data) and comparing the result to the digest value received Here is an example:
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import hmac secret_key = b"peekaboo" # Byte string only known to me Typically # you would want to use a string of random bytes # computed using osurandom() or similar # The message to send
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data = b"Hello World"
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# Send the message somewhere out represents a socket or some # other I/O channel on which we are sending data h = hmacnew(secret_key) hupdate(data) outsend(data) # Send the data outsend(hdigest()) # Send the digest # Receive the message # in represents a socket or some other I/O channel # out which we are receiving data h = hmacnew(secret_key) data = inreceive() # Get the message data hupdate(data) digest = inreceive() # Get the digest sent by the sender if digest != hdigest(): raise AuthenticationError('Message not authenticated')
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In Python 3, this module is called htmlparserThe HTMLParser module defines a class HTMLParser that can be used to parse HTML and XHTML documentsTo use this module, you define your own class that inherits from HTMLParser and redefines methods as appropriate
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HTMLParser()
This is a base class that is used to create HTML parsers It is initialized without any arguments An instance h of HTMLParser has the following methods:
hclose()
Closes the parser and forces the processing of any remaining unparsed dataThis method is called after all HTML data has been fed to the parser
hfeed(data)
Supplies new data to the parserThis data will be immediately parsed However, if the data is incomplete (for example, it ends with an incomplete HTML element), the incomplete portion will be buffered and parsed the next time feed() is called with more data
hgetpos()
Returns the current line number and character offset into that line as a tuple (line, offset)
hget_starttag_text()
Returns the text corresponding to the most recently opened start tag
hhandle_charref(name)
This handler method is called whenever a character reference such as '&#ref;' is encountered name is a string containing the name of the reference For example, when parsing 'å', name will be set to '229'
hhandle_comment(data)
This handler method is called whenever a comment is encountered data is a string containing the text of the comment For example, when parsing the comment '<!--comment-->', data will contain the text 'comment'
hhandle_data(data)
This handler is called to process data that appears between tags data is a string containing text
hhandle_decl(decl)
This handler is called to process declarations such as '<!DOCTYPE HTML >' decl is a string containing the text of the declaration not including the leading '<!' and trailing '>'
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hhandle_endtag(tag)
This handler is called whenever end tags are encountered tag is the name of the tag converted to lowercase For example, if the end tag is '</BODY>', tag is the string 'body'
hhandle_entityref(name)
This handler is called to handle entity references such as '&name;' name is a string containing the name of the reference For example, if parsing '<', name will be set to 'lt'
hhandle_pi(data)
This handler is called to handle processing instructions such as '< processing instruction>' data is a string containing the text of the processing instruction not including the leading '< ' or trailing '>'When called on XHTML-style instructions of the form '< >', the last ' ' will be included in data
hhandle_startendtag(tag, attrs)
This handler processes XHTML-style empty tags such as '<tag name="value" />' tag is a string containing the name of the tag attrs contains attribute information and is a list of tuples of the form (name, value) where name is the attribute name converted to lowercase and value is the attribute valueWhen extracting values, quotes and character entities are replaced For example, if parsing '<a href="http://wwwfoocom"/>', tag is 'a' and attrs is [('href','http://wwwfoocom')] If not defined in derived classes, the default implementation of this method simply calls handle_starttag() and handle_endtag()
hhandle_starttag(tag, attrs)
This handler processes start tags such as '<tag name="value" >' tag and attrs have the same meaning as described for handle_startendtag()
hreset()
Resets the parser, discarding any unprocessed data The following exception is provided: