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<title>Crypto++: PK_Decryptor Class Reference</title>
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<div id="projectname">Crypto++
 <span id="projectnumber">7.0</span>
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<div id="projectbrief">Free C++ class library of cryptographic schemes</div>
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<a href="#pub-methods">Public Member Functions</a> |
<a href="class_p_k___decryptor-members.html">List of all members</a> </div>
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<div class="title">PK_Decryptor Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<p>Interface for public-key decryptors.
<a href="class_p_k___decryptor.html#details">More...</a></p>
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<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for PK_Decryptor:</div>
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<img src="class_p_k___decryptor.png" usemap="#PK_5FDecryptor_map" alt=""/>
<map id="PK_5FDecryptor_map" name="PK_5FDecryptor_map">
<area href="class_p_k___crypto_system.html" title="Interface for public-key encryptors and decryptors." alt="PK_CryptoSystem" shape="rect" coords="384,168,1143,192"/>
<area href="class_private_key_algorithm.html" title="Interface for asymmetric algorithms using private keys." alt="PrivateKeyAlgorithm" shape="rect" coords="1153,168,1912,192"/>
<area href="class_asymmetric_algorithm.html" title="Interface for asymmetric algorithms." alt="AsymmetricAlgorithm" shape="rect" coords="1153,112,1912,136"/>
<area href="class_algorithm.html" title="Interface for all crypto algorithms." alt="Algorithm" shape="rect" coords="1153,56,1912,80"/>
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<area href="class_d_l___crypto_system_base.html" alt="DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< SCHEME_OPTIONS::Element > >" shape="rect" coords="0,280,759,304"/>
<area href="class_d_l___crypto_system_base.html" alt="DL_CryptoSystemBase< PK_Decryptor, DL_PrivateKey< T > >" shape="rect" coords="769,280,1528,304"/>
<area href="class_p_k___fixed_length_crypto_system_impl.html" alt="PK_FixedLengthCryptoSystemImpl< PK_Decryptor >" shape="rect" coords="1538,280,2297,304"/>
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<area href="class_d_l___decryptor_base.html" title="Discrete Log (DL) decryptor base implementation." alt="DL_DecryptorBase< T >" shape="rect" coords="769,336,1528,360"/>
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<area href="class_algorithm_impl.html" alt="AlgorithmImpl< DL_DecryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS::AlgorithmInfo >" shape="rect" coords="0,392,759,416"/>
<area href="class_t_f___decryptor_base.html" title="Trapdoor function cryptosystems decryption base class." alt="TF_DecryptorBase" shape="rect" coords="1538,392,2297,416"/>
<area href="class_d_l___object_impl_base.html" alt="DL_ObjectImplBase< DL_DecryptorBase< SCHEME_OPTIONS::Element >, SCHEME_OPTIONS, SCHEME_OPTIONS::PrivateKey >" shape="rect" coords="0,448,759,472"/>
<area href="class_algorithm_impl.html" alt="AlgorithmImpl< TF_DecryptorBase, SCHEME_OPTIONS::AlgorithmInfo >" shape="rect" coords="1538,448,2297,472"/>
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<area href="class_t_f___object_impl_base.html" alt="TF_ObjectImplBase< TF_DecryptorBase, SCHEME_OPTIONS, SCHEME_OPTIONS::PrivateKey >" shape="rect" coords="1538,504,2297,528"/>
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<area href="class_t_f___decryptor_impl.html" title="Trapdoor Function (TF) decryptor options." alt="TF_DecryptorImpl< SCHEME_OPTIONS >" shape="rect" coords="1538,616,2297,640"/>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ab7466675ed050c440c16508f8a88cac1"><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#a04be65ada92ccb1e6aac0d94b4cc394b">g_nullNameValuePairs</a>) const =0</td></tr>
<tr class="memdesc:ab7466675ed050c440c16508f8a88cac1"><td class="mdescLeft"> </td><td class="mdescRight">Decrypt a byte string. <a href="#ab7466675ed050c440c16508f8a88cac1">More...</a><br /></td></tr>
<tr class="separator:ab7466675ed050c440c16508f8a88cac1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac98bd1dac38f73bdc7d0930053ce9f56"><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#ac98bd1dac38f73bdc7d0930053ce9f56">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#a04be65ada92ccb1e6aac0d94b4cc394b">g_nullNameValuePairs</a>) const</td></tr>
<tr class="memdesc:ac98bd1dac38f73bdc7d0930053ce9f56"><td class="mdescLeft"> </td><td class="mdescRight">Create a new decryption filter. <a href="#ac98bd1dac38f73bdc7d0930053ce9f56">More...</a><br /></td></tr>
<tr class="separator:ac98bd1dac38f73bdc7d0930053ce9f56"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6cdadc344ea0cc9804fded094f7b514a"><td class="memItemLeft" align="right" valign="top"><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#a6cdadc344ea0cc9804fded094f7b514a">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#a04be65ada92ccb1e6aac0d94b4cc394b">g_nullNameValuePairs</a>) const</td></tr>
<tr class="memdesc:a6cdadc344ea0cc9804fded094f7b514a"><td class="mdescLeft"> </td><td class="mdescRight">Decrypt a fixed size ciphertext. <a href="#a6cdadc344ea0cc9804fded094f7b514a">More...</a><br /></td></tr>
<tr class="separator:a6cdadc344ea0cc9804fded094f7b514a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_p_k___crypto_system"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_p_k___crypto_system')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_p_k___crypto_system.html">PK_CryptoSystem</a></td></tr>
<tr class="memitem:aa4a3552c933a36b3aea26f31d00bee9b inherit pub_methods_class_p_k___crypto_system"><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 class="memdesc:aa4a3552c933a36b3aea26f31d00bee9b inherit pub_methods_class_p_k___crypto_system"><td class="mdescLeft"> </td><td class="mdescRight">Provides the maximum length of plaintext for a given ciphertext length. <a href="class_p_k___crypto_system.html#aa4a3552c933a36b3aea26f31d00bee9b">More...</a><br /></td></tr>
<tr class="separator:aa4a3552c933a36b3aea26f31d00bee9b inherit pub_methods_class_p_k___crypto_system"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abf04a4e08fb69a1a118bad3e998ef6a6 inherit pub_methods_class_p_k___crypto_system"><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 class="memdesc:abf04a4e08fb69a1a118bad3e998ef6a6 inherit pub_methods_class_p_k___crypto_system"><td class="mdescLeft"> </td><td class="mdescRight">Calculate the length of ciphertext given length of plaintext. <a href="class_p_k___crypto_system.html#abf04a4e08fb69a1a118bad3e998ef6a6">More...</a><br /></td></tr>
<tr class="separator:abf04a4e08fb69a1a118bad3e998ef6a6 inherit pub_methods_class_p_k___crypto_system"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a294c4664af51a72112db1f04e6ef9049 inherit pub_methods_class_p_k___crypto_system"><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 class="memdesc:a294c4664af51a72112db1f04e6ef9049 inherit pub_methods_class_p_k___crypto_system"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether this object supports the use of a named parameter. <a href="class_p_k___crypto_system.html#a294c4664af51a72112db1f04e6ef9049">More...</a><br /></td></tr>
<tr class="separator:a294c4664af51a72112db1f04e6ef9049 inherit pub_methods_class_p_k___crypto_system"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af415eacc974d297a03c4e7de710e5b4e inherit pub_methods_class_p_k___crypto_system"><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#af415eacc974d297a03c4e7de710e5b4e">FixedCiphertextLength</a> () const</td></tr>
<tr class="memdesc:af415eacc974d297a03c4e7de710e5b4e inherit pub_methods_class_p_k___crypto_system"><td class="mdescLeft"> </td><td class="mdescRight">Provides the fixed ciphertext length, if one exists. <a href="class_p_k___crypto_system.html#af415eacc974d297a03c4e7de710e5b4e">More...</a><br /></td></tr>
<tr class="separator:af415eacc974d297a03c4e7de710e5b4e inherit pub_methods_class_p_k___crypto_system"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a785f1a7390552faf18f9f91c6bc00429 inherit pub_methods_class_p_k___crypto_system"><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#a785f1a7390552faf18f9f91c6bc00429">FixedMaxPlaintextLength</a> () const</td></tr>
<tr class="memdesc:a785f1a7390552faf18f9f91c6bc00429 inherit pub_methods_class_p_k___crypto_system"><td class="mdescLeft"> </td><td class="mdescRight">Provides the maximum plaintext length given a fixed ciphertext length. <a href="class_p_k___crypto_system.html#a785f1a7390552faf18f9f91c6bc00429">More...</a><br /></td></tr>
<tr class="separator:a785f1a7390552faf18f9f91c6bc00429 inherit pub_methods_class_p_k___crypto_system"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_private_key_algorithm"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_private_key_algorithm')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_private_key_algorithm.html">PrivateKeyAlgorithm</a></td></tr>
<tr class="memitem:a48cf4528f16263f2200d5b908a0b8ffb inherit pub_methods_class_private_key_algorithm"><td class="memItemLeft" align="right" valign="top"><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 class="memdesc:a48cf4528f16263f2200d5b908a0b8ffb inherit pub_methods_class_private_key_algorithm"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves a reference to a Private Key. <a href="class_private_key_algorithm.html#a48cf4528f16263f2200d5b908a0b8ffb">More...</a><br /></td></tr>
<tr class="separator:a48cf4528f16263f2200d5b908a0b8ffb inherit pub_methods_class_private_key_algorithm"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a59f3867165685cc6ac6be3f53d5f371b inherit pub_methods_class_private_key_algorithm"><td class="memItemLeft" align="right" valign="top">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#a59f3867165685cc6ac6be3f53d5f371b">GetMaterial</a> () const</td></tr>
<tr class="memdesc:a59f3867165685cc6ac6be3f53d5f371b inherit pub_methods_class_private_key_algorithm"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves a reference to a Private Key. <a href="class_private_key_algorithm.html#a59f3867165685cc6ac6be3f53d5f371b">More...</a><br /></td></tr>
<tr class="separator:a59f3867165685cc6ac6be3f53d5f371b inherit pub_methods_class_private_key_algorithm"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae2085815947c2ae7b3f9f614612e0c17 inherit pub_methods_class_private_key_algorithm"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_private_key.html">PrivateKey</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_private_key_algorithm.html#ae2085815947c2ae7b3f9f614612e0c17">AccessPrivateKey</a> ()=0</td></tr>
<tr class="memdesc:ae2085815947c2ae7b3f9f614612e0c17 inherit pub_methods_class_private_key_algorithm"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves a reference to a Private Key. <a href="class_private_key_algorithm.html#ae2085815947c2ae7b3f9f614612e0c17">More...</a><br /></td></tr>
<tr class="separator:ae2085815947c2ae7b3f9f614612e0c17 inherit pub_methods_class_private_key_algorithm"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab36fe7af04ef624d38c0c06da5b89bb4 inherit pub_methods_class_private_key_algorithm"><td class="memItemLeft" align="right" valign="top">virtual const <a class="el" href="class_private_key.html">PrivateKey</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_private_key_algorithm.html#ab36fe7af04ef624d38c0c06da5b89bb4">GetPrivateKey</a> () const</td></tr>
<tr class="memdesc:ab36fe7af04ef624d38c0c06da5b89bb4 inherit pub_methods_class_private_key_algorithm"><td class="mdescLeft"> </td><td class="mdescRight">Retrieves a reference to a Private Key. <a href="class_private_key_algorithm.html#ab36fe7af04ef624d38c0c06da5b89bb4">More...</a><br /></td></tr>
<tr class="separator:ab36fe7af04ef624d38c0c06da5b89bb4 inherit pub_methods_class_private_key_algorithm"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_algorithm"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_algorithm')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_algorithm.html">Algorithm</a></td></tr>
<tr class="memitem:a1c77f5117ca2cd881baf26a364cfc606 inherit pub_methods_class_algorithm"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_algorithm.html#a1c77f5117ca2cd881baf26a364cfc606">Algorithm</a> (bool checkSelfTestStatus=true)</td></tr>
<tr class="memdesc:a1c77f5117ca2cd881baf26a364cfc606 inherit pub_methods_class_algorithm"><td class="mdescLeft"> </td><td class="mdescRight">Interface for all crypto algorithms. <a href="class_algorithm.html#a1c77f5117ca2cd881baf26a364cfc606">More...</a><br /></td></tr>
<tr class="separator:a1c77f5117ca2cd881baf26a364cfc606 inherit pub_methods_class_algorithm"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4f31510a192d1121856efe8ad0a9b844 inherit pub_methods_class_algorithm"><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="class_algorithm.html#a4f31510a192d1121856efe8ad0a9b844">AlgorithmName</a> () const</td></tr>
<tr class="memdesc:a4f31510a192d1121856efe8ad0a9b844 inherit pub_methods_class_algorithm"><td class="mdescLeft"> </td><td class="mdescRight">Provides the name of this algorithm. <a href="class_algorithm.html#a4f31510a192d1121856efe8ad0a9b844">More...</a><br /></td></tr>
<tr class="separator:a4f31510a192d1121856efe8ad0a9b844 inherit pub_methods_class_algorithm"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_clonable"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_clonable')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_clonable.html">Clonable</a></td></tr>
<tr class="memitem:ad0016ba2d505c23aa85aad49e6c19bb7 inherit pub_methods_class_clonable"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_clonable.html">Clonable</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_clonable.html#ad0016ba2d505c23aa85aad49e6c19bb7">Clone</a> () const</td></tr>
<tr class="memdesc:ad0016ba2d505c23aa85aad49e6c19bb7 inherit pub_methods_class_clonable"><td class="mdescLeft"> </td><td class="mdescRight">Copies this object. <a href="class_clonable.html#ad0016ba2d505c23aa85aad49e6c19bb7">More...</a><br /></td></tr>
<tr class="separator:ad0016ba2d505c23aa85aad49e6c19bb7 inherit pub_methods_class_clonable"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Interface for public-key decryptors. </p>
<p class="definition">Definition at line <a class="el" href="cryptlib_8h_source.html#l02561">2561</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="ab7466675ed050c440c16508f8a88cac1"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ab7466675ed050c440c16508f8a88cac1">◆ </a></span>Decrypt()</h2>
<div class="memitem">
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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="paramtype">const byte * </td>
<td class="paramname"><em>ciphertext</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>ciphertextLength</em>, </td>
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<td class="paramkey"></td>
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<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#a04be65ada92ccb1e6aac0d94b4cc394b">g_nullNameValuePairs</a></code> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td> const</td>
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<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span> </td>
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<p>Decrypt a byte string. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">rng</td><td>a <a class="el" href="class_random_number_generator.html" title="Interface for random number generators.">RandomNumberGenerator</a> derived class </td></tr>
<tr><td class="paramname">ciphertext</td><td>the encrypted byte buffer </td></tr>
<tr><td class="paramname">ciphertextLength</td><td>the size of the encrypted byte buffer </td></tr>
<tr><td class="paramname">plaintext</td><td>a byte buffer to hold the decrypted string </td></tr>
<tr><td class="paramname">parameters</td><td>a set of <a class="el" href="class_name_value_pairs.html" title="Interface for retrieving values given their names.">NameValuePairs</a> to initialize this object </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the result of the decryption operation</dd></dl>
<p>If <a class="el" href="struct_decoding_result.html#ab88062318cd0e68b3061db351d3ba34d" title="Flag to indicate the decoding is valid.">DecodingResult::isValidCoding</a> is true, then <a class="el" href="struct_decoding_result.html#af4496c82e5764175a27e36629e1cded7" title="Recovered message length if isValidCoding is true, undefined otherwise.">DecodingResult::messageLength</a> is valid and holds the the actual length of the plaintext recovered. The result is undefined if decryption failed. If <a class="el" href="struct_decoding_result.html#ab88062318cd0e68b3061db351d3ba34d" title="Flag to indicate the decoding is valid.">DecodingResult::isValidCoding</a> is false, then <a class="el" href="struct_decoding_result.html#af4496c82e5764175a27e36629e1cded7" title="Recovered message length if isValidCoding is true, undefined otherwise.">DecodingResult::messageLength</a> is undefined. </p><dl class="section pre"><dt>Precondition</dt><dd><code><a class="el" href="misc_8h.html#a2d7e4464ea73d6393ebe78f952253426" title="Counts elements in an array.">COUNTOF(plaintext)</a> == MaxPlaintextLength(ciphertextLength)</code> ensures the output byte buffer is large enough </dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_p_k___encryptor.html" title="Interface for public-key encryptors.">PK_Encryptor</a> </dd></dl>
<p>Implemented in <a class="el" href="class_d_l___decryptor_base.html#a4fdcad9e621523ec0f23d56b50969a0b">DL_DecryptorBase< T ></a>, <a class="el" href="class_d_l___decryptor_base.html#a4fdcad9e621523ec0f23d56b50969a0b">DL_DecryptorBase< SCHEME_OPTIONS::Element ></a>, and <a class="el" href="class_t_f___decryptor_base.html#ab013c5ab13f90882f68bf065bd27fbed">TF_DecryptorBase</a>.</p>
</div>
</div>
<a id="ac98bd1dac38f73bdc7d0930053ce9f56"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac98bd1dac38f73bdc7d0930053ce9f56">◆ </a></span>CreateDecryptionFilter()</h2>
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<div class="memproto">
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<table class="memname">
<tr>
<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>
</tr>
<tr>
<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>
</tr>
<tr>
<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#a04be65ada92ccb1e6aac0d94b4cc394b">g_nullNameValuePairs</a></code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
<p>Create a new decryption filter. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">rng</td><td>a <a class="el" href="class_random_number_generator.html" title="Interface for random number generators.">RandomNumberGenerator</a> derived class </td></tr>
<tr><td class="paramname">attachment</td><td>an attached transformation </td></tr>
<tr><td class="paramname">parameters</td><td>a set of <a class="el" href="class_name_value_pairs.html" title="Interface for retrieving values given their names.">NameValuePairs</a> to initialize this object </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the newly created decryption filter </dd></dl>
<dl class="section note"><dt>Note</dt><dd>the caller is responsible for deleting the returned pointer </dd></dl>
<p class="definition">Definition at line <a class="el" href="cryptlib_8cpp_source.html#l00910">910</a> of file <a class="el" href="cryptlib_8cpp_source.html">cryptlib.cpp</a>.</p>
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<a id="a6cdadc344ea0cc9804fded094f7b514a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a6cdadc344ea0cc9804fded094f7b514a">◆ </a></span>FixedLengthDecrypt()</h2>
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<td class="memname"><a class="el" href="struct_decoding_result.html">DecodingResult</a> PK_Decryptor::FixedLengthDecrypt </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>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const byte * </td>
<td class="paramname"><em>ciphertext</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">byte * </td>
<td class="paramname"><em>plaintext</em>, </td>
</tr>
<tr>
<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#a04be65ada92ccb1e6aac0d94b4cc394b">g_nullNameValuePairs</a></code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span></span> </td>
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</div><div class="memdoc">
<p>Decrypt a fixed size ciphertext. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">rng</td><td>a <a class="el" href="class_random_number_generator.html" title="Interface for random number generators.">RandomNumberGenerator</a> derived class </td></tr>
<tr><td class="paramname">ciphertext</td><td>the encrypted byte buffer </td></tr>
<tr><td class="paramname">plaintext</td><td>a byte buffer to hold the decrypted string </td></tr>
<tr><td class="paramname">parameters</td><td>a set of <a class="el" href="class_name_value_pairs.html" title="Interface for retrieving values given their names.">NameValuePairs</a> to initialize this object </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the result of the decryption operation</dd></dl>
<p>If <a class="el" href="struct_decoding_result.html#ab88062318cd0e68b3061db351d3ba34d" title="Flag to indicate the decoding is valid.">DecodingResult::isValidCoding</a> is true, then <a class="el" href="struct_decoding_result.html#af4496c82e5764175a27e36629e1cded7" title="Recovered message length if isValidCoding is true, undefined otherwise.">DecodingResult::messageLength</a> is valid and holds the the actual length of the plaintext recovered. The result is undefined if decryption failed. If <a class="el" href="struct_decoding_result.html#ab88062318cd0e68b3061db351d3ba34d" title="Flag to indicate the decoding is valid.">DecodingResult::isValidCoding</a> is false, then <a class="el" href="struct_decoding_result.html#af4496c82e5764175a27e36629e1cded7" title="Recovered message length if isValidCoding is true, undefined otherwise.">DecodingResult::messageLength</a> is undefined. </p><dl class="section pre"><dt>Precondition</dt><dd><code><a class="el" href="misc_8h.html#a2d7e4464ea73d6393ebe78f952253426" title="Counts elements in an array.">COUNTOF(plaintext)</a> == MaxPlaintextLength(ciphertextLength)</code> ensures the output byte buffer is large enough </dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_p_k___encryptor.html" title="Interface for public-key encryptors.">PK_Encryptor</a> </dd></dl>
<p class="definition">Definition at line <a class="el" href="cryptlib_8h_source.html#l02606">2606</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
</div>
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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>
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