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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Crypto++: HMAC< T > Class Template Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li class="current"><a href="classes.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="classes.html"><span>Alphabetical List</span></a></li> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>HMAC< T > Class Template Reference</h1><!-- doxytag: class="HMAC" --><!-- doxytag: inherits="MessageAuthenticationCodeImpl< HMAC_Base, HMAC< T > >" --><code>#include <<a class="el" href="hmac_8h-source.html">hmac.h</a>></code><p><p>Inheritance diagram for HMAC< T >:<p><center><img src="class_h_m_a_c.png" usemap="#HMAC< T >_map" border="0" alt=""></center><map name="HMAC< T >_map"><area href="class_message_authentication_code_impl.html" alt="MessageAuthenticationCodeImpl< HMAC_Base, HMAC< T > >" shape="rect" coords="261,392,773,416"><area href="class_algorithm_impl.html" alt="AlgorithmImpl< SimpleKeyingInterfaceImpl< HMAC_Base, HMAC< T > >, HMAC< T > >" shape="rect" coords="261,336,773,360"><area href="class_simple_keying_interface_impl.html" alt="SimpleKeyingInterfaceImpl< HMAC_Base, HMAC< T > >" shape="rect" coords="261,280,773,304"><area href="class_h_m_a_c___base.html" alt="HMAC_Base" shape="rect" coords="261,224,773,248"><area href="class_variable_key_length.html" alt="VariableKeyLength< 16, 0, INT_MAX >" shape="rect" coords="0,168,512,192"><area href="class_message_authentication_code.html" alt="MessageAuthenticationCode" shape="rect" coords="522,168,1034,192"><area href="class_hash_transformation.html" alt="HashTransformation" shape="rect" coords="261,112,773,136"><area href="class_simple_keying_interface.html" alt="SimpleKeyingInterface" shape="rect" coords="783,112,1295,136"><area href="class_algorithm.html" alt="Algorithm" shape="rect" coords="261,56,773,80"><area href="class_clonable.html" alt="Clonable" shape="rect" coords="261,0,773,24"></map><a href="class_h_m_a_c-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2><h3>template<class T><br> class HMAC< T ></h3><a href="http://www.weidai.com/scan-mirror/mac.html#HMAC">HMAC</a> <p>HMAC(K, text) = H(K XOR opad, H(K XOR ipad, text)) <p><p>Definition at line <a class="el" href="hmac_8h-source.html#l00040">40</a> of file <a class="el" href="hmac_8h-source.html">hmac.h</a>.<table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Public Types</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#88201c180fbfaa9fef2715252546ad6e">IV_Requirement</a> { <br> <a class="el" href="class_simple_keying_interface.html#88201c180fbfaa9fef2715252546ad6e1cc32e69fe4f385e54d9d482a2ab5a56">UNIQUE_IV</a> = 0, <a class="el" href="class_simple_keying_interface.html#88201c180fbfaa9fef2715252546ad6e4520c4379ee3a1aed95a36e2235ba338">RANDOM_IV</a>, <a class="el" href="class_simple_keying_interface.html#88201c180fbfaa9fef2715252546ad6eceff3ad4b12bcb6d7b61a5bd543a815c">UNPREDICTABLE_RANDOM_IV</a>, <a class="el" href="class_simple_keying_interface.html#88201c180fbfaa9fef2715252546ad6eb659bf6d2c470c50c14bfbab5b2d45ab">INTERNALLY_GENERATED_IV</a>, <br> <a class="el" href="class_simple_keying_interface.html#88201c180fbfaa9fef2715252546ad6ec1d24de3dedd05c28516f452d3ace417">NOT_RESYNCHRONIZABLE</a><br> }</td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="8ca0d4c7d1a29cd46906f6384e2fe615"></a><!-- doxytag: member="HMAC::HMAC" ref="8ca0d4c7d1a29cd46906f6384e2fe615" args="()" --> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c.html#8ca0d4c7d1a29cd46906f6384e2fe615">HMAC</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="84d6e40e7e5798283afbf40cb77dd19d"></a><!-- doxytag: member="HMAC::HMAC" ref="84d6e40e7e5798283afbf40cb77dd19d" args="(const byte *key, size_t length=HMAC_Base::DEFAULT_KEYLENGTH)" --> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c.html#84d6e40e7e5798283afbf40cb77dd19d">HMAC</a> (const byte *key, size_t length=<a class="el" href="class_variable_key_length.html#3788ee30b190bdc0c0e89d2721162614">HMAC_Base::DEFAULT_KEYLENGTH</a>)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="9953ec5c13284a128ff177207ed5681b"></a><!-- doxytag: member="HMAC::AlgorithmName" ref="9953ec5c13284a128ff177207ed5681b" args="() const" -->std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c.html#9953ec5c13284a128ff177207ed5681b">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" nowrap align="right" valign="top"><a class="anchor" name="f3e42c83041a26ffaef5e378e352caa0"></a><!-- doxytag: member="HMAC::MinKeyLength" ref="f3e42c83041a26ffaef5e378e352caa0" args="() const" -->size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface_impl.html#f3e42c83041a26ffaef5e378e352caa0">MinKeyLength</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">returns smallest valid key length in bytes */ <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="c72a5a82d8a5d9e19e18f7e146b35df4"></a><!-- doxytag: member="HMAC::MaxKeyLength" ref="c72a5a82d8a5d9e19e18f7e146b35df4" args="() const" -->size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface_impl.html#c72a5a82d8a5d9e19e18f7e146b35df4">MaxKeyLength</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">returns largest valid key length in bytes */ <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="017e0545328286b51892a93f95aabf8e"></a><!-- doxytag: member="HMAC::DefaultKeyLength" ref="017e0545328286b51892a93f95aabf8e" args="() const" -->size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface_impl.html#017e0545328286b51892a93f95aabf8e">DefaultKeyLength</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">returns default (recommended) key length in bytes */ <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b0d253f0866af8431fcafdfc9d32e888"></a><!-- doxytag: member="HMAC::GetValidKeyLength" ref="b0d253f0866af8431fcafdfc9d32e888" args="(size_t n) const" -->size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface_impl.html#b0d253f0866af8431fcafdfc9d32e888">GetValidKeyLength</a> (size_t n) const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">returns the smallest valid key length in bytes that is >= min(n, GetMaxKeyLength()) <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f9e6ac5f39488b6a3f8220c539c6cfeb"></a><!-- doxytag: member="HMAC::IVRequirement" ref="f9e6ac5f39488b6a3f8220c539c6cfeb" args="() const" --><a class="el" href="class_simple_keying_interface.html#88201c180fbfaa9fef2715252546ad6e">SimpleKeyingInterface::IV_Requirement</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface_impl.html#f9e6ac5f39488b6a3f8220c539c6cfeb">IVRequirement</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">returns the minimal requirement for secure IVs <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="cba54a012806e2b2d0f61c1aa64a3a25"></a><!-- doxytag: member="HMAC::IVSize" ref="cba54a012806e2b2d0f61c1aa64a3a25" args="() const" -->unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface_impl.html#cba54a012806e2b2d0f61c1aa64a3a25">IVSize</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">returns size of IVs used by this object <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3fa7312a806642d28e9c849b8e2c17dc"></a><!-- doxytag: member="HMAC::UncheckedSetKey" ref="3fa7312a806642d28e9c849b8e2c17dc" args="(const byte *userKey, unsigned int keylength, const NameValuePairs &params)" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c___base.html#3fa7312a806642d28e9c849b8e2c17dc">UncheckedSetKey</a> (const byte *userKey, unsigned int keylength, const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> &params)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="7bdeb5438c920045d122017a6b4ab426"></a><!-- doxytag: member="HMAC::Restart" ref="7bdeb5438c920045d122017a6b4ab426" args="()" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c___base.html#7bdeb5438c920045d122017a6b4ab426">Restart</a> ()</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">discard the current state, and restart with a new message <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="efb8a1fb43ef8c9390ee89bbb41c83af"></a><!-- doxytag: member="HMAC::Update" ref="efb8a1fb43ef8c9390ee89bbb41c83af" args="(const byte *input, size_t length)" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c___base.html#efb8a1fb43ef8c9390ee89bbb41c83af">Update</a> (const byte *input, size_t length)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">process more input <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="5454c1446981ddee322b0521c6ebd375"></a><!-- doxytag: member="HMAC::TruncatedFinal" ref="5454c1446981ddee322b0521c6ebd375" args="(byte *mac, size_t size)" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c___base.html#5454c1446981ddee322b0521c6ebd375">TruncatedFinal</a> (byte *mac, size_t size)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">truncated version of <a class="el" href="class_hash_transformation.html#a0b8c7a110d8968268fd02ec32b9a8e8" title="compute hash for current message, then restart for a new message">Final()</a> <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3f8a783fe1da496cf33bf35d6376100b"></a><!-- doxytag: member="HMAC::OptimalBlockSize" ref="3f8a783fe1da496cf33bf35d6376100b" args="() const" -->unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c___base.html#3f8a783fe1da496cf33bf35d6376100b">OptimalBlockSize</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">input to <a class="el" href="class_h_m_a_c___base.html#efb8a1fb43ef8c9390ee89bbb41c83af" title="process more input">Update()</a> should have length a multiple of this for optimal speed <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="c47c7569f590e0a2ff2339d058c3337d"></a><!-- doxytag: member="HMAC::DigestSize" ref="c47c7569f590e0a2ff2339d058c3337d" args="() const" -->unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_h_m_a_c___base.html#c47c7569f590e0a2ff2339d058c3337d">DigestSize</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">size of the hash returned by <a class="el" href="class_hash_transformation.html#a0b8c7a110d8968268fd02ec32b9a8e8" title="compute hash for current message, then restart for a new message">Final()</a> <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_hash_transformation.html">HashTransformation</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#39b0a4c4cdc11fda358f9975b5e4137e">Ref</a> ()</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">return a reference to this object, <a href="#39b0a4c4cdc11fda358f9975b5e4137e"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="9fc0b332ef36900ca6ea5d949e95aba1"></a><!-- doxytag: member="HMAC::CreateUpdateSpace" ref="9fc0b332ef36900ca6ea5d949e95aba1" args="(size_t &size)" -->virtual byte * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#9fc0b332ef36900ca6ea5d949e95aba1">CreateUpdateSpace</a> (size_t &size)</td></tr>⌨️ 快捷键说明
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