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Initial commit of OpenSPARC T2 architecture model.
[OpenSPARC-T2-SAM] / sam-t2 / devtools / v8plus / html / python / lib / module-hmac.html
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17<title>15.1 hmac -- Keyed-Hashing for Message Authentication</title>
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55<H1><A NAME="SECTION0017100000000000000000">
5615.1 <tt class="module">hmac</tt> --
57 Keyed-Hashing for Message Authentication</A>
58</H1>
59
60<P>
61<A NAME="module-hmac"></A>
62
63<P>
64
65<span class="versionnote">New in version 2.2.</span>
66
67<P>
68This module implements the HMAC algorithm as described by <a class="rfc" id='rfcref-92061' xml:id='rfcref-92061'
69href="http://www.faqs.org/rfcs/rfc2104.html">RFC 2104</a>.
70
71<P>
72<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
73 <td><nobr><b><tt id='l2h-4807' xml:id='l2h-4807' class="function">new</tt></b>(</nobr></td>
74 <td><var>key</var><big>[</big><var>, msg</var><big>[</big><var>, digestmod</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
75<dd>
76 Return a new hmac object. If <var>msg</var> is present, the method call
77 <code>update(<var>msg</var>)</code> is made. <var>digestmod</var> is the digest
78 module for the HMAC object to use. It defaults to the
79 <tt class="module"><a href="module-md5.html">md5</a></tt> module.
80</dl>
81
82<P>
83An HMAC object has the following methods:
84
85<P>
86<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
87 <td><nobr><b><tt id='l2h-4808' xml:id='l2h-4808' class="method">update</tt></b>(</nobr></td>
88 <td><var>msg</var>)</td></tr></table></dt>
89<dd>
90 Update the hmac object with the string <var>msg</var>. Repeated calls
91 are equivalent to a single call with the concatenation of all the
92 arguments: <code>m.update(a); m.update(b)</code> is equivalent to
93 <code>m.update(a + b)</code>.
94</dl>
95
96<P>
97<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
98 <td><nobr><b><tt id='l2h-4809' xml:id='l2h-4809' class="method">digest</tt></b>(</nobr></td>
99 <td><var></var>)</td></tr></table></dt>
100<dd>
101 Return the digest of the strings passed to the <tt class="method">update()</tt>
102 method so far. This is a 16-byte string (for <tt class="module"><a href="module-md5.html">md5</a></tt>) or a
103 20-byte string (for <tt class="module"><a href="module-sha.html">sha</a></tt>) which may contain non-ASCII
104 characters, including NUL bytes.
105</dl>
106
107<P>
108<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
109 <td><nobr><b><tt id='l2h-4810' xml:id='l2h-4810' class="method">hexdigest</tt></b>(</nobr></td>
110 <td><var></var>)</td></tr></table></dt>
111<dd>
112 Like <tt class="method">digest()</tt> except the digest is returned as a string of
113 length 32 for <tt class="module"><a href="module-md5.html">md5</a></tt> (40 for <tt class="module"><a href="module-sha.html">sha</a></tt>), containing
114 only hexadecimal digits. This may be used to exchange the value
115 safely in email or other non-binary environments.
116</dl>
117
118<P>
119<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
120 <td><nobr><b><tt id='l2h-4811' xml:id='l2h-4811' class="method">copy</tt></b>(</nobr></td>
121 <td><var></var>)</td></tr></table></dt>
122<dd>
123 Return a copy (``clone'') of the hmac object. This can be used to
124 efficiently compute the digests of strings that share a common
125 initial substring.
126</dl>
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162<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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Full OpenSPARC architecture tarball including simulator, hypervisor, and OBP.