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<div class="title">AESSmall128 Class Reference</div> </div>
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<p>AES block cipher with 128-bit keys and reduced memory usage.
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<a href="classAESSmall128.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="AES_8h_source.html">AES.h</a>></code></p>
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Inheritance diagram for AESSmall128:</div>
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<area href="classAESTiny128.html" title="AES block cipher with 128-bit keys and tiny memory usage. " alt="AESTiny128" shape="rect" coords="0,56,88,80"/>
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<area href="classBlockCipher.html" title="Abstract base class for block ciphers. " alt="BlockCipher" shape="rect" coords="0,0,88,24"/>
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</map>
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</div></div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:abfa3d897d55524dadb1afbdc45eaed5e"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classAESSmall128.html#abfa3d897d55524dadb1afbdc45eaed5e">AESSmall128</a> ()</td></tr>
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<tr class="memdesc:abfa3d897d55524dadb1afbdc45eaed5e"><td class="mdescLeft"> </td><td class="mdescRight">Constructs an AES 128-bit block cipher with no initial key. <a href="#abfa3d897d55524dadb1afbdc45eaed5e">More...</a><br/></td></tr>
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<tr class="separator:abfa3d897d55524dadb1afbdc45eaed5e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6ca13e59f88498c8c3da338e76f47de5"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classAESSmall128.html#a6ca13e59f88498c8c3da338e76f47de5">setKey</a> (const uint8_t *key, size_t len)</td></tr>
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<tr class="memdesc:a6ca13e59f88498c8c3da338e76f47de5"><td class="mdescLeft"> </td><td class="mdescRight">Sets the key to use for future encryption and decryption operations. <a href="#a6ca13e59f88498c8c3da338e76f47de5">More...</a><br/></td></tr>
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<tr class="separator:a6ca13e59f88498c8c3da338e76f47de5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aabdb20c638b2107b5b5e3e41dc6dae26"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classAESSmall128.html#aabdb20c638b2107b5b5e3e41dc6dae26">decryptBlock</a> (uint8_t *output, const uint8_t *input)</td></tr>
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<tr class="memdesc:aabdb20c638b2107b5b5e3e41dc6dae26"><td class="mdescLeft"> </td><td class="mdescRight">Decrypts a single block using this cipher. <a href="#aabdb20c638b2107b5b5e3e41dc6dae26">More...</a><br/></td></tr>
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<tr class="separator:aabdb20c638b2107b5b5e3e41dc6dae26"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a215b28599d388c2149aba2206d40863d"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classAESSmall128.html#a215b28599d388c2149aba2206d40863d">clear</a> ()</td></tr>
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<tr class="memdesc:a215b28599d388c2149aba2206d40863d"><td class="mdescLeft"> </td><td class="mdescRight">Clears all security-sensitive state from this block cipher. <a href="#a215b28599d388c2149aba2206d40863d">More...</a><br/></td></tr>
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<tr class="separator:a215b28599d388c2149aba2206d40863d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="inherit_header pub_methods_classAESTiny128"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classAESTiny128')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classAESTiny128.html">AESTiny128</a></td></tr>
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<tr class="memitem:a24682489d5af52f16c7ba2bc4b1116e8 inherit pub_methods_classAESTiny128"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classAESTiny128.html#a24682489d5af52f16c7ba2bc4b1116e8">AESTiny128</a> ()</td></tr>
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<tr class="memdesc:a24682489d5af52f16c7ba2bc4b1116e8 inherit pub_methods_classAESTiny128"><td class="mdescLeft"> </td><td class="mdescRight">Constructs an AES 128-bit block cipher with no initial key. <a href="#a24682489d5af52f16c7ba2bc4b1116e8">More...</a><br/></td></tr>
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<tr class="separator:a24682489d5af52f16c7ba2bc4b1116e8 inherit pub_methods_classAESTiny128"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ad00941c5ed48c413b30636420fd42a2e inherit pub_methods_classAESTiny128"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classAESTiny128.html#ad00941c5ed48c413b30636420fd42a2e">blockSize</a> () const </td></tr>
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<tr class="memdesc:ad00941c5ed48c413b30636420fd42a2e inherit pub_methods_classAESTiny128"><td class="mdescLeft"> </td><td class="mdescRight">Size of an AES block in bytes. <a href="#ad00941c5ed48c413b30636420fd42a2e">More...</a><br/></td></tr>
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<tr class="separator:ad00941c5ed48c413b30636420fd42a2e inherit pub_methods_classAESTiny128"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6ff732873f0df88d93c3f7df1fb7a168 inherit pub_methods_classAESTiny128"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classAESTiny128.html#a6ff732873f0df88d93c3f7df1fb7a168">keySize</a> () const </td></tr>
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<tr class="memdesc:a6ff732873f0df88d93c3f7df1fb7a168 inherit pub_methods_classAESTiny128"><td class="mdescLeft"> </td><td class="mdescRight">Size of a 128-bit AES key in bytes. <a href="#a6ff732873f0df88d93c3f7df1fb7a168">More...</a><br/></td></tr>
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<tr class="separator:a6ff732873f0df88d93c3f7df1fb7a168 inherit pub_methods_classAESTiny128"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a9e343baf2c3c815f8482222c52ebb3a3 inherit pub_methods_classAESTiny128"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classAESTiny128.html#a9e343baf2c3c815f8482222c52ebb3a3">encryptBlock</a> (uint8_t *output, const uint8_t *input)</td></tr>
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<tr class="memdesc:a9e343baf2c3c815f8482222c52ebb3a3 inherit pub_methods_classAESTiny128"><td class="mdescLeft"> </td><td class="mdescRight">Encrypts a single block using this cipher. <a href="#a9e343baf2c3c815f8482222c52ebb3a3">More...</a><br/></td></tr>
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<tr class="separator:a9e343baf2c3c815f8482222c52ebb3a3 inherit pub_methods_classAESTiny128"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="inherit_header pub_methods_classBlockCipher"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classBlockCipher')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classBlockCipher.html">BlockCipher</a></td></tr>
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<tr class="memitem:adc3d7cba116cbea9ad017f4cded6fe2f inherit pub_methods_classBlockCipher"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="adc3d7cba116cbea9ad017f4cded6fe2f"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="classBlockCipher.html#adc3d7cba116cbea9ad017f4cded6fe2f">BlockCipher</a> ()</td></tr>
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<tr class="memdesc:adc3d7cba116cbea9ad017f4cded6fe2f inherit pub_methods_classBlockCipher"><td class="mdescLeft"> </td><td class="mdescRight">Constructs a block cipher. <br/></td></tr>
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<tr class="separator:adc3d7cba116cbea9ad017f4cded6fe2f inherit pub_methods_classBlockCipher"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:acec1bc4faeaa6dda2d91bffd79a988f9 inherit pub_methods_classBlockCipher"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classBlockCipher.html#acec1bc4faeaa6dda2d91bffd79a988f9">~BlockCipher</a> ()</td></tr>
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<tr class="memdesc:acec1bc4faeaa6dda2d91bffd79a988f9 inherit pub_methods_classBlockCipher"><td class="mdescLeft"> </td><td class="mdescRight">Destroys this block cipher object. <a href="#acec1bc4faeaa6dda2d91bffd79a988f9">More...</a><br/></td></tr>
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<tr class="separator:acec1bc4faeaa6dda2d91bffd79a988f9 inherit pub_methods_classBlockCipher"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>AES block cipher with 128-bit keys and reduced memory usage. </p>
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<p>This class differs from the <a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a> class in that the RAM requirements are vastly reduced. The key schedule is expanded round by round instead of being generated and stored by <a class="el" href="classAESSmall128.html#a6ca13e59f88498c8c3da338e76f47de5" title="Sets the key to use for future encryption and decryption operations. ">setKey()</a>. The performance of encryption and decryption is slightly less because of this.</p>
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<p>This class is useful when RAM is at a premium and reduced encryption performance is not a hindrance to the application.</p>
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<p>The companion <a class="el" href="classAESTiny128.html" title="AES block cipher with 128-bit keys and tiny memory usage. ">AESTiny128</a> class uses even less RAM but only supports the <a class="el" href="classAESTiny128.html#a9e343baf2c3c815f8482222c52ebb3a3" title="Encrypts a single block using this cipher. ">encryptBlock()</a> operation. Block cipher modes like <a class="el" href="classCTR.html" title="Implementation of the Counter (CTR) mode for 128-bit block ciphers. ">CTR</a>, <a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>, and <a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a> do not need the <a class="el" href="classAESSmall128.html#aabdb20c638b2107b5b5e3e41dc6dae26" title="Decrypts a single block using this cipher. ">decryptBlock()</a> operation, so <a class="el" href="classAESTiny128.html" title="AES block cipher with 128-bit keys and tiny memory usage. ">AESTiny128</a> may be a better option than <a class="el" href="classAESSmall128.html" title="AES block cipher with 128-bit keys and reduced memory usage. ">AESSmall128</a> for many applications.</p>
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<dl class="section see"><dt>See Also</dt><dd><a class="el" href="classAESTiny128.html" title="AES block cipher with 128-bit keys and tiny memory usage. ">AESTiny128</a>, <a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a> </dd></dl>
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<p>Definition at line <a class="el" href="AES_8h_source.html#l00173">173</a> of file <a class="el" href="AES_8h_source.html">AES.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">AESSmall128::AESSmall128 </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<p>Constructs an AES 128-bit block cipher with no initial key. </p>
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<p>This constructor must be followed by a call to <a class="el" href="classAESSmall128.html#a6ca13e59f88498c8c3da338e76f47de5" title="Sets the key to use for future encryption and decryption operations. ">setKey()</a> before the block cipher can be used for encryption or decryption. </p>
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<p>Definition at line <a class="el" href="AES128_8cpp_source.html#l00271">271</a> of file <a class="el" href="AES128_8cpp_source.html">AES128.cpp</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<a class="anchor" id="a215b28599d388c2149aba2206d40863d"></a>
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<td class="memname">void AESSmall128::clear </td>
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<td>(</td>
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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<p>Clears all security-sensitive state from this block cipher. </p>
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<p>Security-sensitive information includes key schedules and any temporary state that is used by <a class="el" href="classAESTiny128.html#a9e343baf2c3c815f8482222c52ebb3a3" title="Encrypts a single block using this cipher. ">encryptBlock()</a> or <a class="el" href="classAESSmall128.html#aabdb20c638b2107b5b5e3e41dc6dae26" title="Decrypts a single block using this cipher. ">decryptBlock()</a> which is stored in the object itself.</p>
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<dl class="section see"><dt>See Also</dt><dd><a class="el" href="classAESSmall128.html#a6ca13e59f88498c8c3da338e76f47de5" title="Sets the key to use for future encryption and decryption operations. ">setKey()</a>, <a class="el" href="classAESTiny128.html#a9e343baf2c3c815f8482222c52ebb3a3" title="Encrypts a single block using this cipher. ">encryptBlock()</a>, <a class="el" href="classAESSmall128.html#aabdb20c638b2107b5b5e3e41dc6dae26" title="Decrypts a single block using this cipher. ">decryptBlock()</a> </dd></dl>
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<p>Reimplemented from <a class="el" href="classAESTiny128.html#a17e56d025f9e55041150953d8561c793">AESTiny128</a>.</p>
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<p>Definition at line <a class="el" href="AES128_8cpp_source.html#l00350">350</a> of file <a class="el" href="AES128_8cpp_source.html">AES128.cpp</a>.</p>
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<td class="memname">void AESSmall128::decryptBlock </td>
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<td>(</td>
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<td class="paramtype">uint8_t * </td>
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<td class="paramname"><em>output</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint8_t * </td>
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<td class="paramname"><em>input</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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<p>Decrypts a single block using this cipher. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">output</td><td>The output buffer to put the plaintext into. Must be at least <a class="el" href="classAESTiny128.html#ad00941c5ed48c413b30636420fd42a2e" title="Size of an AES block in bytes. ">blockSize()</a> bytes in length. </td></tr>
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<tr><td class="paramname">input</td><td>The input buffer to read the ciphertext from which is allowed to overlap with <em>output</em>. Must be at least <a class="el" href="classAESTiny128.html#ad00941c5ed48c413b30636420fd42a2e" title="Size of an AES block in bytes. ">blockSize()</a> bytes in length.</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section see"><dt>See Also</dt><dd><a class="el" href="classAESTiny128.html#a9e343baf2c3c815f8482222c52ebb3a3" title="Encrypts a single block using this cipher. ">encryptBlock()</a>, <a class="el" href="classAESTiny128.html#ad00941c5ed48c413b30636420fd42a2e" title="Size of an AES block in bytes. ">blockSize()</a> </dd></dl>
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<p>Reimplemented from <a class="el" href="classAESTiny128.html#a631c417a0f12c7e43f633c555b950182">AESTiny128</a>.</p>
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<p>Definition at line <a class="el" href="AES128_8cpp_source.html#l00306">306</a> of file <a class="el" href="AES128_8cpp_source.html">AES128.cpp</a>.</p>
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<a class="anchor" id="a6ca13e59f88498c8c3da338e76f47de5"></a>
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<table class="mlabels">
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<td class="mlabels-left">
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<table class="memname">
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<td class="memname">bool AESSmall128::setKey </td>
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<td>(</td>
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<td class="paramtype">const uint8_t * </td>
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<td class="paramname"><em>key</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">size_t </td>
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<td class="paramname"><em>len</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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</table>
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</div><div class="memdoc">
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<p>Sets the key to use for future encryption and decryption operations. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">key</td><td>The key to use. </td></tr>
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<tr><td class="paramname">len</td><td>The length of the key. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>Returns false if the key length is not supported, or the key is somehow "weak" and unusable by this cipher.</dd></dl>
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<p>Use <a class="el" href="classAESSmall128.html#a215b28599d388c2149aba2206d40863d" title="Clears all security-sensitive state from this block cipher. ">clear()</a> or the destructor to remove the key and any other sensitive data from the object once encryption or decryption is complete.</p>
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<dl class="section see"><dt>See Also</dt><dd><a class="el" href="classAESTiny128.html#a6ff732873f0df88d93c3f7df1fb7a168" title="Size of a 128-bit AES key in bytes. ">keySize()</a>, <a class="el" href="classAESSmall128.html#a215b28599d388c2149aba2206d40863d" title="Clears all security-sensitive state from this block cipher. ">clear()</a> </dd></dl>
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<p>Reimplemented from <a class="el" href="classAESTiny128.html#a475b147be367e6053ff64e30bf79694c">AESTiny128</a>.</p>
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<p>Definition at line <a class="el" href="AES128_8cpp_source.html#l00280">280</a> of file <a class="el" href="AES128_8cpp_source.html">AES128.cpp</a>.</p>
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</div>
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</div>
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<hr/>The documentation for this class was generated from the following files:<ul>
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<li><a class="el" href="AES_8h_source.html">AES.h</a></li>
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<li><a class="el" href="AES128_8cpp_source.html">AES128.cpp</a></li>
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</ul>
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