class_p_k___verifier_with_recovery.html

Crypto++是一个非常强大的密码学库,主要是功能全

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recover a message from its signature 
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<dl compact><dt><b>Precondition:</b></dt><dd>leftoverMessageAccumulator was obtained by calling NewLeftoverMessageAccumulator(signature) <p>
<a class="el" href="class_hash_transformation.html#_x_m_a_c_c___basea13">HashTransformation::Final()</a> has not been called on leftoverMessageAccumulator <p>
length of signature == <a class="el" href="class_p_k___signature_scheme.html#_p_k___verifier_with_recoverya6">SignatureLength()</a> <p>
size of recoveredMessage == <a class="el" href="class_p_k___signature_scheme_with_recovery.html#_p_k___verifier_with_recoverya4">MaximumRecoverableLength()</a></dd></dl>

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Implemented in <a class="el" href="class_verifier_with_recovery_template.html#_verifier_with_recovery_templatea7">VerifierWithRecoveryTemplate&lt; TF, H &gt;</a>.    </td>
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<a name="_verifier_with_recovery_templatea13" doxytag="PK_VerifierWithRecovery::RecoverMessage"></a><p>
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          <td class="md" nowrap valign="top"> virtual <a class="el" href="struct_decoding_result.html">DecodingResult</a> PK_VerifierWithRecovery::RecoverMessage </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">byte *&nbsp;</td>
          <td class="mdname" nowrap> <em>recoveredMessage</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>const byte *&nbsp;</td>
          <td class="mdname" nowrap> <em>message</em>, </td>
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          <td></td>
          <td class="md" nowrap>unsigned int&nbsp;</td>
          <td class="mdname" nowrap> <em>messageLen</em>, </td>
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          <td></td>
          <td class="md" nowrap>const byte *&nbsp;</td>
          <td class="mdname" nowrap> <em>signature</em></td>
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          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"> const<code> [inline, virtual]</code></td>
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recover a message from its signature 
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<dl compact><dt><b>Note:</b></dt><dd>This function should be equivalent to Recover(recoveredMessage, NewRecoveryAccumulator(signature), signature) </dd></dl>
<dl compact><dt><b>Precondition:</b></dt><dd>length of signature == <a class="el" href="class_p_k___signature_scheme.html#_p_k___verifier_with_recoverya6">SignatureLength()</a> <p>
size of recoveredMessage == <a class="el" href="class_p_k___signature_scheme_with_recovery.html#_p_k___verifier_with_recoverya4">MaximumRecoverableLength()</a></dd></dl>

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Definition at line <a class="el" href="cryptlib_8h-source.html#l01359">1359</a> of file <a class="el" href="cryptlib_8h-source.html">cryptlib.h</a>.    </td>
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<a name="_p_k___verifier_with_recoverya5" doxytag="PK_VerifierWithRecovery::AllowLeftoverMessage"></a><p>
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          <td class="md" nowrap valign="top"> virtual bool PK_SignatureSchemeWithRecovery::AllowLeftoverMessage </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [pure virtual, inherited]</code></td>
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whether or not messages longer than <a class="el" href="class_p_k___signature_scheme_with_recovery.html#_p_k___verifier_with_recoverya4">MaximumRecoverableLength()</a> can be signed 
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If this function returns false, any message longer than <a class="el" href="class_p_k___signature_scheme_with_recovery.html#_p_k___verifier_with_recoverya4">MaximumRecoverableLength()</a> will be truncated for signature and will fail verification.
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Implemented in <a class="el" href="class_signature_system_with_recovery_base_template.html#_verifier_with_recovery_templatea12">SignatureSystemWithRecoveryBaseTemplate&lt; H &gt;</a>.    </td>
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<a name="_verifier_with_recovery_templatea14" doxytag="PK_VerifierWithRecovery::SignatureUpfrontForVerification"></a><p>
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          <td class="md" nowrap valign="top"> virtual bool PK_Verifier::SignatureUpfrontForVerification </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [inline, virtual, inherited]</code></td>
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If this function returns true, you must input the signature when calling <a class="el" href="class_p_k___verifier.html#_verifier_with_recovery_templatea15">NewVerificationAccumulator()</a>. Otherwise, you must input the signature when calling <a class="el" href="class_p_k___verifier.html#_verifier_with_recovery_templatea16">Verify()</a>. 
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Definition at line <a class="el" href="cryptlib_8h-source.html#l01268">1268</a> of file <a class="el" href="cryptlib_8h-source.html">cryptlib.h</a>.    </td>
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<a name="_verifier_with_recovery_templatea15" doxytag="PK_VerifierWithRecovery::NewVerificationAccumulator"></a><p>
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          <td class="md" nowrap valign="top"> virtual <a class="el" href="class_hash_transformation.html">HashTransformation</a>* PK_Verifier::NewVerificationAccumulator </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const byte *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>signature</em> = NULL          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [inline, virtual, inherited]</code></td>
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create a new <a class="el" href="class_hash_transformation.html">HashTransformation</a> to accumulate the message to be verified 
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<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign=top><em>signature</em>&nbsp;</td><td>is ignored if <a class="el" href="class_p_k___verifier.html#_verifier_with_recovery_templatea14">SignatureUpfrontForVerification()</a> == false </td></tr>
    <tr><td valign=top><em>signature</em>&nbsp;</td><td>may be NULL to indicate that the signature is not available yet</td></tr>
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