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<title>Crypto++: PK_SignatureScheme 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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<div class="title">PK_SignatureScheme Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<p>Interface for public-key signers and verifiers.
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<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for PK_SignatureScheme:</div>
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<img src="class_p_k___signature_scheme.png" usemap="#PK_5FSignatureScheme_map" alt=""/>
<map id="PK_5FSignatureScheme_map" name="PK_5FSignatureScheme_map">
<area href="class_p_k___signer.html" title="Interface for public-key signers." alt="PK_Signer" shape="rect" coords="781,56,1552,80"/>
<area href="class_p_k___verifier.html" title="Interface for public-key signature verifiers." alt="PK_Verifier" shape="rect" coords="3124,56,3895,80"/>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme_1_1_invalid_key_length.html">InvalidKeyLength</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight"><a class="el" href="class_exception.html" title="Base class for all exceptions thrown by the library.">Exception</a> throw when the private or public key has a length that can't be used. <a href="class_p_k___signature_scheme_1_1_invalid_key_length.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme_1_1_key_too_short.html">KeyTooShort</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight"><a class="el" href="class_exception.html" title="Base class for all exceptions thrown by the library.">Exception</a> throw when the private or public key is too short to sign or verify. <a href="class_p_k___signature_scheme_1_1_key_too_short.html#details">More...</a><br /></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:aab30ad8e2da2d706cf6c69bdac963afc"><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme.html#aab30ad8e2da2d706cf6c69bdac963afc">SignatureLength</a> () const =0</td></tr>
<tr class="memdesc:aab30ad8e2da2d706cf6c69bdac963afc"><td class="mdescLeft"> </td><td class="mdescRight">Provides the signature length if it only depends on the key. <a href="#aab30ad8e2da2d706cf6c69bdac963afc">More...</a><br /></td></tr>
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<tr class="memitem:a665909c10f27db81343a01c814488652"><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme.html#a665909c10f27db81343a01c814488652">MaxSignatureLength</a> (size_t recoverablePartLength=0) const</td></tr>
<tr class="memdesc:a665909c10f27db81343a01c814488652"><td class="mdescLeft"> </td><td class="mdescRight">Provides the maximum signature length produced given the length of the recoverable message part. <a href="#a665909c10f27db81343a01c814488652">More...</a><br /></td></tr>
<tr class="separator:a665909c10f27db81343a01c814488652"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1f6a62ce468f172636f117ee0693038f"><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme.html#a1f6a62ce468f172636f117ee0693038f">MaxRecoverableLength</a> () const =0</td></tr>
<tr class="memdesc:a1f6a62ce468f172636f117ee0693038f"><td class="mdescLeft"> </td><td class="mdescRight">Provides the length of longest message that can be recovered. <a href="#a1f6a62ce468f172636f117ee0693038f">More...</a><br /></td></tr>
<tr class="separator:a1f6a62ce468f172636f117ee0693038f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2f2a599ba385e63766d4a7f7ccf2a884"><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme.html#a2f2a599ba385e63766d4a7f7ccf2a884">MaxRecoverableLengthFromSignatureLength</a> (size_t signatureLength) const =0</td></tr>
<tr class="memdesc:a2f2a599ba385e63766d4a7f7ccf2a884"><td class="mdescLeft"> </td><td class="mdescRight">Provides the length of longest message that can be recovered from a signature of given length. <a href="#a2f2a599ba385e63766d4a7f7ccf2a884">More...</a><br /></td></tr>
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<tr class="memitem:adeb758d5f8ae8fad137d11ad1c5c60c0"><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme.html#adeb758d5f8ae8fad137d11ad1c5c60c0">IsProbabilistic</a> () const =0</td></tr>
<tr class="memdesc:adeb758d5f8ae8fad137d11ad1c5c60c0"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether a signature scheme requires a random number generator. <a href="#adeb758d5f8ae8fad137d11ad1c5c60c0">More...</a><br /></td></tr>
<tr class="separator:adeb758d5f8ae8fad137d11ad1c5c60c0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a00368da9563ce49efc42b5cd0d9c7738"><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme.html#a00368da9563ce49efc42b5cd0d9c7738">AllowNonrecoverablePart</a> () const =0</td></tr>
<tr class="memdesc:a00368da9563ce49efc42b5cd0d9c7738"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether the non-recoverable message part can be signed. <a href="#a00368da9563ce49efc42b5cd0d9c7738">More...</a><br /></td></tr>
<tr class="separator:a00368da9563ce49efc42b5cd0d9c7738"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8f62890f0485b9ca58528047871f8894"><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme.html#a8f62890f0485b9ca58528047871f8894">SignatureUpfront</a> () const</td></tr>
<tr class="memdesc:a8f62890f0485b9ca58528047871f8894"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether the signature must be input before the message. <a href="#a8f62890f0485b9ca58528047871f8894">More...</a><br /></td></tr>
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<tr class="memitem:a168ca843d63ddababdf2cee3eaa02813"><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_p_k___signature_scheme.html#a168ca843d63ddababdf2cee3eaa02813">RecoverablePartFirst</a> () const =0</td></tr>
<tr class="memdesc:a168ca843d63ddababdf2cee3eaa02813"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether the recoverable part must be input before the non-recoverable part. <a href="#a168ca843d63ddababdf2cee3eaa02813">More...</a><br /></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 signers and verifiers. </p>
<p>This class provides an interface common to signers and verifiers for querying scheme properties </p><dl class="section see"><dt>See also</dt><dd><a class="el" href="class_d_l___signature_scheme_base.html" title="Discrete Log (DL) signature scheme base implementation.">DL_SignatureSchemeBase</a>, <a class="el" href="class_t_f___signature_scheme_base.html" title="Trapdoor Function (TF) Signature Scheme base class.">TF_SignatureSchemeBase</a>, <a class="el" href="class_d_l___signer_base.html" title="Discrete Log (DL) signature scheme signer base implementation.">DL_SignerBase</a>, <a class="el" href="class_t_f___signer_base.html" title="Trapdoor Function (TF) Signer base class.">TF_SignerBase</a> </dd></dl>
<p class="definition">Definition at line <a class="el" href="cryptlib_8h_source.html#l02613">2613</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aab30ad8e2da2d706cf6c69bdac963afc">◆ </a></span>SignatureLength()</h2>
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<td class="memname">virtual size_t PK_SignatureScheme::SignatureLength </td>
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<td class="paramname"></td><td>)</td>
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<p>Provides the signature length if it only depends on the key. </p>
<dl class="section return"><dt>Returns</dt><dd>the signature length if it only depends on the key, in bytes</dd></dl>
<p><a class="el" href="class_p_k___signature_scheme.html#aab30ad8e2da2d706cf6c69bdac963afc" title="Provides the signature length if it only depends on the key.">SignatureLength()</a> returns the signature length if it only depends on the key, otherwise 0. </p>
<p>Implemented in <a class="el" href="class_d_l___signature_scheme_base.html#a63a23ab47647f237450713ae3b9a0579">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a63a23ab47647f237450713ae3b9a0579">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a63a23ab47647f237450713ae3b9a0579">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< T > ></a>, and <a class="el" href="class_d_l___signature_scheme_base.html#a63a23ab47647f237450713ae3b9a0579">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< T > ></a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a665909c10f27db81343a01c814488652">◆ </a></span>MaxSignatureLength()</h2>
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<td class="memname">virtual size_t PK_SignatureScheme::MaxSignatureLength </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>recoverablePartLength</em> = <code>0</code></td><td>)</td>
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<p>Provides the maximum signature length produced given the length of the recoverable message part. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">recoverablePartLength</td><td>the length of the recoverable message part, in bytes </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>the maximum signature length produced for a given length of recoverable message part, in bytes</dd></dl>
<p><a class="el" href="class_p_k___signature_scheme.html#a665909c10f27db81343a01c814488652" title="Provides the maximum signature length produced given the length of the recoverable message part.">MaxSignatureLength()</a> returns the maximum signature length produced given the length of the recoverable message part. </p>
<p class="definition">Definition at line <a class="el" href="cryptlib_8h_source.html#l02646">2646</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1f6a62ce468f172636f117ee0693038f">◆ </a></span>MaxRecoverableLength()</h2>
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<p>Provides the length of longest message that can be recovered. </p>
<dl class="section return"><dt>Returns</dt><dd>the length of longest message that can be recovered, in bytes</dd></dl>
<p><a class="el" href="class_p_k___signature_scheme.html#a1f6a62ce468f172636f117ee0693038f" title="Provides the length of longest message that can be recovered.">MaxRecoverableLength()</a> returns the length of longest message that can be recovered, or 0 if this signature scheme does not support message recovery. </p>
<p>Implemented in <a class="el" href="class_d_l___signature_scheme_base.html#a3e03fa8c30d9a2426d76dc2800c9c6be">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a3e03fa8c30d9a2426d76dc2800c9c6be">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a3e03fa8c30d9a2426d76dc2800c9c6be">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< T > ></a>, and <a class="el" href="class_d_l___signature_scheme_base.html#a3e03fa8c30d9a2426d76dc2800c9c6be">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< T > ></a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a2f2a599ba385e63766d4a7f7ccf2a884">◆ </a></span>MaxRecoverableLengthFromSignatureLength()</h2>
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<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>signatureLength</em></td><td>)</td>
<td> const</td>
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<p>Provides the length of longest message that can be recovered from a signature of given length. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">signatureLength</td><td>the length of the signature, in bytes </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>the length of longest message that can be recovered from a signature of given length, in bytes</dd></dl>
<p><a class="el" href="class_p_k___signature_scheme.html#a2f2a599ba385e63766d4a7f7ccf2a884" title="Provides the length of longest message that can be recovered from a signature of given length.">MaxRecoverableLengthFromSignatureLength()</a> returns the length of longest message that can be recovered from a signature of given length, or 0 if this signature scheme does not support message recovery. </p>
<p>Implemented in <a class="el" href="class_d_l___signature_scheme_base.html#a674f7f2f22ea848e9037b26f8e89d647">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a674f7f2f22ea848e9037b26f8e89d647">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a674f7f2f22ea848e9037b26f8e89d647">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< T > ></a>, and <a class="el" href="class_d_l___signature_scheme_base.html#a674f7f2f22ea848e9037b26f8e89d647">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< T > ></a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#adeb758d5f8ae8fad137d11ad1c5c60c0">◆ </a></span>IsProbabilistic()</h2>
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<td class="memname">virtual bool PK_SignatureScheme::IsProbabilistic </td>
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<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>Determines whether a signature scheme requires a random number generator. </p>
<dl class="section return"><dt>Returns</dt><dd>true if the signature scheme requires a <a class="el" href="class_random_number_generator.html" title="Interface for random number generators.">RandomNumberGenerator()</a> to sign</dd></dl>
<p>if <a class="el" href="class_p_k___signature_scheme.html#adeb758d5f8ae8fad137d11ad1c5c60c0" title="Determines whether a signature scheme requires a random number generator.">IsProbabilistic()</a> returns false, then <a class="el" href="cryptlib_8h.html#a1e53479a6d427158247ac1ece3161a6d" title="Random Number Generator that does not produce random numbers.">NullRNG()</a> can be passed to functions that take <a class="el" href="class_random_number_generator.html" title="Interface for random number generators.">RandomNumberGenerator()</a>. </p>
<p>Implemented in <a class="el" href="class_d_l___signature_scheme_base.html#ae8d0f5575d87a5da34c2abbfff2ffd76">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#ae8d0f5575d87a5da34c2abbfff2ffd76">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#ae8d0f5575d87a5da34c2abbfff2ffd76">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< T > ></a>, and <a class="el" href="class_d_l___signature_scheme_base.html#ae8d0f5575d87a5da34c2abbfff2ffd76">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< T > ></a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a00368da9563ce49efc42b5cd0d9c7738">◆ </a></span>AllowNonrecoverablePart()</h2>
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<td class="memname">virtual bool PK_SignatureScheme::AllowNonrecoverablePart </td>
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<p>Determines whether the non-recoverable message part can be signed. </p>
<dl class="section return"><dt>Returns</dt><dd>true if the non-recoverable message part can be signed </dd></dl>
<p>Implemented in <a class="el" href="class_d_l___signature_scheme_base.html#a4d02b520584c6ba2eb999df6a6816658">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a4d02b520584c6ba2eb999df6a6816658">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a4d02b520584c6ba2eb999df6a6816658">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< T > ></a>, and <a class="el" href="class_d_l___signature_scheme_base.html#a4d02b520584c6ba2eb999df6a6816658">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< T > ></a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a8f62890f0485b9ca58528047871f8894">◆ </a></span>SignatureUpfront()</h2>
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<td class="memname">virtual bool PK_SignatureScheme::SignatureUpfront </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>Determines whether the signature must be input before the message. </p>
<dl class="section return"><dt>Returns</dt><dd>true if the signature must be input before the message during verifcation</dd></dl>
<p>if <a class="el" href="class_p_k___signature_scheme.html#a8f62890f0485b9ca58528047871f8894" title="Determines whether the signature must be input before the message.">SignatureUpfront()</a> returns true, then you must input the signature before the message during verification. Otherwise you can input the signature at anytime. </p>
<p class="definition">Definition at line <a class="el" href="cryptlib_8h_source.html#l02677">2677</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a168ca843d63ddababdf2cee3eaa02813">◆ </a></span>RecoverablePartFirst()</h2>
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<td class="memname">virtual bool PK_SignatureScheme::RecoverablePartFirst </td>
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<td class="paramname"></td><td>)</td>
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<p>Determines whether the recoverable part must be input before the non-recoverable part. </p>
<dl class="section return"><dt>Returns</dt><dd>true if the recoverable part must be input before the non-recoverable part during signing</dd></dl>
<p><a class="el" href="class_p_k___signature_scheme.html#a168ca843d63ddababdf2cee3eaa02813" title="Determines whether the recoverable part must be input before the non-recoverable part.">RecoverablePartFirst()</a> determines whether you must input the recoverable part before the non-recoverable part during signing </p>
<p>Implemented in <a class="el" href="class_d_l___signature_scheme_base.html#a421734cadc68d89db651ef49f776cfc8">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a421734cadc68d89db651ef49f776cfc8">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< SCHEME_OPTIONS::Element > ></a>, <a class="el" href="class_d_l___signature_scheme_base.html#a421734cadc68d89db651ef49f776cfc8">DL_SignatureSchemeBase< PK_Verifier, DL_PublicKey< T > ></a>, and <a class="el" href="class_d_l___signature_scheme_base.html#a421734cadc68d89db651ef49f776cfc8">DL_SignatureSchemeBase< PK_Signer, DL_PrivateKey< T > ></a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="cryptlib_8h_source.html">cryptlib.h</a></li>
</ul>
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