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<h1>PK_Decryptor Class Reference</h1><!-- doxytag: class="PK_Decryptor" --><!-- doxytag: inherits="PK_CryptoSystem,PrivateKeyAlgorithm" -->
<p>interface for public-key decryptors
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for PK_Decryptor:</div>
<div class="dynsection">
<div class="center">
<img src="class_p_k___decryptor.gif" usemap="#PK_Decryptor_map" alt=""/>
<map id="PK_Decryptor_map" name="PK_Decryptor_map">
<area href="class_p_k___crypto_system.html" alt="PK_CryptoSystem" shape="rect" coords="384,168,1143,192"/>
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<p><a href="class_p_k___decryptor-members.html">List of all members.</a></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="struct_decoding_result.html">DecodingResult</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___decryptor.html#ab7466675ed050c440c16508f8a88cac1">Decrypt</a> (<a class="el" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> &parameters=<a class="el" href="cryptlib_8h.html#ad3205973dd1afa14090a683154c1109c">g_nullNameValuePairs</a>) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">decrypt a byte string, and return the length of plaintext <a href="#ab7466675ed050c440c16508f8a88cac1"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_buffered_transformation.html">BufferedTransformation</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___decryptor.html#a495d8801c8042d3c3576e00965bd9bc8">CreateDecryptionFilter</a> (<a class="el" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, <a class="el" href="class_buffered_transformation.html">BufferedTransformation</a> *attachment=NULL, const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> &parameters=<a class="el" href="cryptlib_8h.html#ad3205973dd1afa14090a683154c1109c">g_nullNameValuePairs</a>) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">create a new decryption filter <a href="#a495d8801c8042d3c3576e00965bd9bc8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae7dbfced7f2792685edac3feca348ba0"></a><!-- doxytag: member="PK_Decryptor::FixedLengthDecrypt" ref="ae7dbfced7f2792685edac3feca348ba0" args="(RandomNumberGenerator &rng, const byte *ciphertext, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const " -->
<a class="el" href="struct_decoding_result.html">DecodingResult</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___decryptor.html#ae7dbfced7f2792685edac3feca348ba0">FixedLengthDecrypt</a> (<a class="el" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, const byte *ciphertext, byte *plaintext, const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> &parameters=<a class="el" href="cryptlib_8h.html#ad3205973dd1afa14090a683154c1109c">g_nullNameValuePairs</a>) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">decrypt a fixed size ciphertext <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___crypto_system.html#aa4a3552c933a36b3aea26f31d00bee9b">MaxPlaintextLength</a> (size_t ciphertextLength) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">maximum length of plaintext for a given ciphertext length <a href="#aa4a3552c933a36b3aea26f31d00bee9b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___crypto_system.html#abf04a4e08fb69a1a118bad3e998ef6a6">CiphertextLength</a> (size_t plaintextLength) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">calculate length of ciphertext given length of plaintext <a href="#abf04a4e08fb69a1a118bad3e998ef6a6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___crypto_system.html#a294c4664af51a72112db1f04e6ef9049">ParameterSupported</a> (const char *name) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">this object supports the use of the parameter with the given name <a href="#a294c4664af51a72112db1f04e6ef9049"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___crypto_system.html#ac803af974c9849eea17d73ac48b38566">FixedCiphertextLength</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">return fixed ciphertext length, if one exists, otherwise return 0 <a href="#ac803af974c9849eea17d73ac48b38566"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a900d50ffe8e8956c4f2a7ec22d818603"></a><!-- doxytag: member="PK_Decryptor::FixedMaxPlaintextLength" ref="a900d50ffe8e8956c4f2a7ec22d818603" args="() const " -->
virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___crypto_system.html#a900d50ffe8e8956c4f2a7ec22d818603">FixedMaxPlaintextLength</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">return maximum plaintext length given the fixed ciphertext length, if one exists, otherwise return 0 <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a48cf4528f16263f2200d5b908a0b8ffb"></a><!-- doxytag: member="PK_Decryptor::AccessMaterial" ref="a48cf4528f16263f2200d5b908a0b8ffb" args="()" -->
<a class="el" href="class_crypto_material.html">CryptoMaterial</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_private_key_algorithm.html#a48cf4528f16263f2200d5b908a0b8ffb">AccessMaterial</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns a reference to the crypto material used by this object <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a0199217f43af73a6ad78fe1303903fe3"></a><!-- doxytag: member="PK_Decryptor::GetMaterial" ref="a0199217f43af73a6ad78fe1303903fe3" args="() const " -->
const <a class="el" href="class_crypto_material.html">CryptoMaterial</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_private_key_algorithm.html#a0199217f43af73a6ad78fe1303903fe3">GetMaterial</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns a const reference to the crypto material used by this object <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae2085815947c2ae7b3f9f614612e0c17"></a><!-- doxytag: member="PK_Decryptor::AccessPrivateKey" ref="ae2085815947c2ae7b3f9f614612e0c17" args="()=0" -->
virtual <a class="el" href="class_private_key.html">PrivateKey</a> & </td><td class="memItemRight" valign="bottom"><b>AccessPrivateKey</b> ()=0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a24edb4d57abc975e0e40ee02ce8f08fa"></a><!-- doxytag: member="PK_Decryptor::GetPrivateKey" ref="a24edb4d57abc975e0e40ee02ce8f08fa" args="() const " -->
virtual const <a class="el" href="class_private_key.html">PrivateKey</a> & </td><td class="memItemRight" valign="bottom"><b>GetPrivateKey</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a522dbfcd5c1a46bf1be301cec26d6534"></a><!-- doxytag: member="PK_Decryptor::BERDecode" ref="a522dbfcd5c1a46bf1be301cec26d6534" args="(BufferedTransformation &bt)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_asymmetric_algorithm.html#a522dbfcd5c1a46bf1be301cec26d6534">BERDecode</a> (<a class="el" href="class_buffered_transformation.html">BufferedTransformation</a> &bt)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">for backwards compatibility, calls <a class="el" href="class_asymmetric_algorithm.html#ad99d55413166b69a0a12e10d111926c8" title="returns a reference to the crypto material used by this object">AccessMaterial()</a>.Load(bt) <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a2d704079890783422b0a44653480ab83"></a><!-- doxytag: member="PK_Decryptor::DEREncode" ref="a2d704079890783422b0a44653480ab83" args="(BufferedTransformation &bt) const " -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_asymmetric_algorithm.html#a2d704079890783422b0a44653480ab83">DEREncode</a> (<a class="el" href="class_buffered_transformation.html">BufferedTransformation</a> &bt) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">for backwards compatibility, calls <a class="el" href="class_asymmetric_algorithm.html#adf9cc798c5a2d20ab3436dbad8e6df2d" title="returns a const reference to the crypto material used by this object">GetMaterial()</a>.Save(bt) <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acd21c6715add4884fa043eaf51655039"></a><!-- doxytag: member="PK_Decryptor::AlgorithmName" ref="acd21c6715add4884fa043eaf51655039" args="() const " -->
virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="class_algorithm.html#acd21c6715add4884fa043eaf51655039">AlgorithmName</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns name of this algorithm, not universally implemented yet <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a24b43349a71e1f98508eeb10b31a0a62"></a><!-- doxytag: member="PK_Decryptor::Clone" ref="a24b43349a71e1f98508eeb10b31a0a62" args="() const " -->
virtual <a class="el" href="class_clonable.html">Clonable</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_clonable.html#a24b43349a71e1f98508eeb10b31a0a62">Clone</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">this is not implemented by most classes yet <br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>interface for public-key decryptors </p>
<p>Definition at line <a class="el" href="cryptlib_8h_source.html#l01265">1265</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="ab7466675ed050c440c16508f8a88cac1"></a><!-- doxytag: member="PK_Decryptor::Decrypt" ref="ab7466675ed050c440c16508f8a88cac1" args="(RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const =0" -->
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<td class="memname">virtual <a class="el" href="struct_decoding_result.html">DecodingResult</a> PK_Decryptor::Decrypt </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_random_number_generator.html">RandomNumberGenerator</a> & </td>
<td class="paramname"> <em>rng</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const byte * </td>
<td class="paramname"> <em>ciphertext</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>ciphertextLength</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">byte * </td>
<td class="paramname"> <em>plaintext</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> & </td>
<td class="paramname"> <em>parameters</em> = <code><a class="el" href="cryptlib_8h.html#ad3205973dd1afa14090a683154c1109c">g_nullNameValuePairs</a></code></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [pure virtual]</code></td>
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<p>decrypt a byte string, and return the length of plaintext </p>
<dl class="pre"><dt><b>Precondition:</b></dt><dd>size of plaintext == MaxPlaintextLength(ciphertextLength) bytes. </dd></dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the actual length of the plaintext, indication that decryption failed. </dd></dl>
<p>Implemented in <a class="el" href="class_t_f___decryptor_base.html#af46c7592f103bcb827445e5cbce8b7f9">TF_DecryptorBase</a>, <a class="el" href="class_d_l___decryptor_base.html#a5a23bde8893b76023182413d24f75b74">DL_DecryptorBase< T ></a>, and <a class="el" href="class_d_l___decryptor_base.html#a5a23bde8893b76023182413d24f75b74">DL_DecryptorBase< SCHEME_OPTIONS::Element ></a>.</p>
<p>Referenced by <a class="el" href="cryptlib_8cpp_source.html#l00710">PK_DefaultDecryptionFilter::Put2()</a>.</p>
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<a class="anchor" id="a495d8801c8042d3c3576e00965bd9bc8"></a><!-- doxytag: member="PK_Decryptor::CreateDecryptionFilter" ref="a495d8801c8042d3c3576e00965bd9bc8" args="(RandomNumberGenerator &rng, BufferedTransformation *attachment=NULL, const NameValuePairs &parameters=g_nullNameValuePairs) const " -->
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<td class="memname"><a class="el" href="class_buffered_transformation.html">BufferedTransformation</a> * PK_Decryptor::CreateDecryptionFilter </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_random_number_generator.html">RandomNumberGenerator</a> & </td>
<td class="paramname"> <em>rng</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="class_buffered_transformation.html">BufferedTransformation</a> * </td>
<td class="paramname"> <em>attachment</em> = <code>NULL</code>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> & </td>
<td class="paramname"> <em>parameters</em> = <code><a class="el" href="cryptlib_8h.html#ad3205973dd1afa14090a683154c1109c">g_nullNameValuePairs</a></code></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [virtual]</code></td>
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<p>create a new decryption filter </p>
<dl class="note"><dt><b>Note:</b></dt><dd>caller is responsible for deleting the returned pointer </dd></dl>
<p>Definition at line <a class="el" href="cryptlib_8cpp_source.html#l00744">744</a> of file <a class="el" href="cryptlib_8cpp_source.html">cryptlib.cpp</a>.</p>
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<a class="anchor" id="aa4a3552c933a36b3aea26f31d00bee9b"></a><!-- doxytag: member="PK_Decryptor::MaxPlaintextLength" ref="aa4a3552c933a36b3aea26f31d00bee9b" args="(size_t ciphertextLength) const =0" -->
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<td class="memname">virtual size_t PK_CryptoSystem::MaxPlaintextLength </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>ciphertextLength</em></td>
<td> ) </td>
<td> const<code> [pure virtual, inherited]</code></td>
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<p>maximum length of plaintext for a given ciphertext length </p>
<dl class="note"><dt><b>Note:</b></dt><dd>This function returns 0 if ciphertextLength is not valid (too long or too short). </dd></dl>
<p>Referenced by <a class="el" href="cryptlib_8cpp_source.html#l00710">PK_DefaultDecryptionFilter::Put2()</a>.</p>
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<a class="anchor" id="abf04a4e08fb69a1a118bad3e998ef6a6"></a><!-- doxytag: member="PK_Decryptor::CiphertextLength" ref="abf04a4e08fb69a1a118bad3e998ef6a6" args="(size_t plaintextLength) const =0" -->
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<td class="memname">virtual size_t PK_CryptoSystem::CiphertextLength </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>plaintextLength</em></td>
<td> ) </td>
<td> const<code> [pure virtual, inherited]</code></td>
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<p>calculate length of ciphertext given length of plaintext </p>
<dl class="note"><dt><b>Note:</b></dt><dd>This function returns 0 if plaintextLength is not valid (too long). </dd></dl>
<p>Referenced by <a class="el" href="cryptlib_8cpp_source.html#l00665">PK_DefaultEncryptionFilter::Put2()</a>.</p>
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<a class="anchor" id="a294c4664af51a72112db1f04e6ef9049"></a><!-- doxytag: member="PK_Decryptor::ParameterSupported" ref="a294c4664af51a72112db1f04e6ef9049" args="(const char *name) const =0" -->
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<td class="memname">virtual bool PK_CryptoSystem::ParameterSupported </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>name</em></td>
<td> ) </td>
<td> const<code> [pure virtual, inherited]</code></td>
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<p>this object supports the use of the parameter with the given name </p>
<p>some possible parameter names: EncodingParameters, KeyDerivationParameters </p>
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<a class="anchor" id="ac803af974c9849eea17d73ac48b38566"></a><!-- doxytag: member="PK_Decryptor::FixedCiphertextLength" ref="ac803af974c9849eea17d73ac48b38566" args="() const " -->
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<td class="memname">virtual size_t PK_CryptoSystem::FixedCiphertextLength </td>
<td>(</td>
<td class="paramname"></td>
<td> ) </td>
<td> const<code> [inline, virtual, inherited]</code></td>
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<p>return fixed ciphertext length, if one exists, otherwise return 0 </p>
<dl class="note"><dt><b>Note:</b></dt><dd>"Fixed" here means length of ciphertext does not depend on length of plaintext. It usually does depend on the key length. </dd></dl>
<p>Definition at line <a class="el" href="cryptlib_8h_source.html#l01225">1225</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
<p>Referenced by <a class="el" href="cryptlib_8h_source.html#l01283">FixedLengthDecrypt()</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="cryptlib_8h_source.html">cryptlib.h</a></li>
<li><a class="el" href="cryptlib_8cpp_source.html">cryptlib.cpp</a></li>
</ul>
</div>
<hr size="1"/><address style="text-align: right;"><small>Generated on 9 Dec 2009 for Crypto++ by
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address>
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