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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++: SHA256 Class 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>SHA256 Class Reference</h1><!-- doxytag: class="SHA256" --><!-- doxytag: inherits="IteratedHashWithStaticTransform< word32, BigEndian, 64, 32, SHA256 >" --><code>#include <<a class="el" href="sha_8h-source.html">sha.h</a>></code><p><p>Inheritance diagram for SHA256:<p><center><img src="class_s_h_a256.png" usemap="#SHA256_map" border="0" alt=""></center><map name="SHA256_map"><area href="class_iterated_hash_with_static_transform.html" alt="IteratedHashWithStaticTransform< word32, BigEndian, 64, 32, SHA256 >" shape="rect" coords="0,392,600,416"><area href="class_clonable_impl.html" alt="ClonableImpl< SHA256, AlgorithmImpl< IteratedHash< word32, BigEndian, T_BlockSize >, SHA256 > >" shape="rect" coords="0,336,600,360"><area href="class_algorithm_impl.html" alt="AlgorithmImpl< IteratedHash< word32, BigEndian, T_BlockSize >, SHA256 >" shape="rect" coords="0,280,600,304"><area href="class_iterated_hash.html" alt="IteratedHash< word32, BigEndian, T_BlockSize >" shape="rect" coords="0,224,600,248"><area href="class_iterated_hash_base.html" alt="IteratedHashBase< word32, HashTransformation >" shape="rect" coords="0,168,600,192"><area href="class_hash_transformation.html" alt="HashTransformation" shape="rect" coords="0,112,600,136"><area href="class_algorithm.html" alt="Algorithm" shape="rect" coords="0,56,600,80"><area href="class_clonable.html" alt="Clonable" shape="rect" coords="0,0,600,24"></map><a href="class_s_h_a256-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>implements the SHA-256 standard <p><p>Definition at line <a class="el" href="sha_8h-source.html#l00020">20</a> of file <a class="el" href="sha_8h-source.html">sha.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"><a class="anchor" name="6ec15728121293aef70ca8b30b2e7e7a"></a><!-- doxytag: member="SHA256::ByteOrderClass" ref="6ec15728121293aef70ca8b30b2e7e7a" args="" -->typedef <a class="el" href="struct_enum_to_type.html">BigEndian</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash.html#6ec15728121293aef70ca8b30b2e7e7a">ByteOrderClass</a></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ce0350088eea8679cbe23668d2498c07"></a><!-- doxytag: member="SHA256::HashWordType" ref="ce0350088eea8679cbe23668d2498c07" args="" -->typedef word32 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash.html#ce0350088eea8679cbe23668d2498c07">HashWordType</a></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="f308600222696a01464a8e93bc2c00c0"></a><!-- doxytag: member="SHA256::DigestSize" ref="f308600222696a01464a8e93bc2c00c0" args="() const" -->unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash_with_static_transform.html#f308600222696a01464a8e93bc2c00c0">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="anchor" name="7de60f1498b0a1a0b0a4bde4ddf969bd"></a><!-- doxytag: member="SHA256::Clone" ref="7de60f1498b0a1a0b0a4bde4ddf969bd" args="() const" --><a class="el" href="class_clonable.html">Clonable</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_clonable_impl.html#7de60f1498b0a1a0b0a4bde4ddf969bd">Clone</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">this is not implemented by most classes yet <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="bd1b02bf6cda820fa6cc56ea5a9eac20"></a><!-- doxytag: member="SHA256::AlgorithmName" ref="bd1b02bf6cda820fa6cc56ea5a9eac20" args="() const" -->std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="class_algorithm_impl.html#bd1b02bf6cda820fa6cc56ea5a9eac20">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="76cb174a108aa1178e444681c0d8c2ff"></a><!-- doxytag: member="SHA256::BlockSize" ref="76cb174a108aa1178e444681c0d8c2ff" args="() const" -->unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash.html#76cb174a108aa1178e444681c0d8c2ff">BlockSize</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">block size of underlying compression function, or 0 if not block based <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="26df02878f3fa09146154f9d6eaba1a4"></a><!-- doxytag: member="SHA256::GetByteOrder" ref="26df02878f3fa09146154f9d6eaba1a4" args="() const" --><a class="el" href="cryptlib_8h.html#aeb92d42f5a6e27b8ba19f18d69d142b">ByteOrder</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash.html#26df02878f3fa09146154f9d6eaba1a4">GetByteOrder</a> () const</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4c3fa4d29ad29d2b8add76ea62117523"></a><!-- doxytag: member="SHA256::OptimalBlockSize" ref="4c3fa4d29ad29d2b8add76ea62117523" args="() const" -->unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash_base.html#4c3fa4d29ad29d2b8add76ea62117523">OptimalBlockSize</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">input to <a class="el" href="class_iterated_hash_base.html#3202914349a18f79facb605d75f0d10c" 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="167fbaf6c7e6f9f1744d7204cf118c65"></a><!-- doxytag: member="SHA256::OptimalDataAlignment" ref="167fbaf6c7e6f9f1744d7204cf118c65" args="() const" -->unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash_base.html#167fbaf6c7e6f9f1744d7204cf118c65">OptimalDataAlignment</a> () const</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">returns how input should be aligned for optimal performance <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3202914349a18f79facb605d75f0d10c"></a><!-- doxytag: member="SHA256::Update" ref="3202914349a18f79facb605d75f0d10c" args="(const byte *input, size_t length)" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash_base.html#3202914349a18f79facb605d75f0d10c">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="816fce9e3cab60c1c4ecef77a321be96"></a><!-- doxytag: member="SHA256::CreateUpdateSpace" ref="816fce9e3cab60c1c4ecef77a321be96" args="(size_t &size)" -->byte * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash_base.html#816fce9e3cab60c1c4ecef77a321be96">CreateUpdateSpace</a> (size_t &size)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">request space to write input into <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="d53da712634ea213ad047b2a68b0fe70"></a><!-- doxytag: member="SHA256::Restart" ref="d53da712634ea213ad047b2a68b0fe70" args="()" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash_base.html#d53da712634ea213ad047b2a68b0fe70">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="2fb87191e0a4359fb9e81c71f99db600"></a><!-- doxytag: member="SHA256::TruncatedFinal" ref="2fb87191e0a4359fb9e81c71f99db600" args="(byte *digest, size_t size)" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash_base.html#2fb87191e0a4359fb9e81c71f99db600">TruncatedFinal</a> (byte *digest, 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="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">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#a0b8c7a110d8968268fd02ec32b9a8e8">Final</a> (byte *digest)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">compute hash for current message, then restart for a new message <a href="#a0b8c7a110d8968268fd02ec32b9a8e8"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f8124c4fca23b74bbdc43660bdae692c"></a><!-- doxytag: member="SHA256::CalculateDigest" ref="f8124c4fca23b74bbdc43660bdae692c" args="(byte *digest, const byte *input, size_t length)" -->virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#f8124c4fca23b74bbdc43660bdae692c">CalculateDigest</a> (byte *digest, const byte *input, size_t length)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">use this if your input is in one piece and you don't want to call <a class="el" href="class_hash_transformation.html#afabefaf445b65d3ba0d8e1c0294afe5" title="process more input">Update()</a> and <a class="el" href="class_hash_transformation.html#a0b8c7a110d8968268fd02ec32b9a8e8" title="compute hash for current message, then restart for a new message">Final()</a> separately <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#16c4aecd047015d513feef4ed5b929ba">Verify</a> (const byte *digest)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">verify that digest is a valid digest for the current message, then reinitialize the object <a href="#16c4aecd047015d513feef4ed5b929ba"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="cad96df68e70d922683e5063057130b2"></a><!-- doxytag: member="SHA256::VerifyDigest" ref="cad96df68e70d922683e5063057130b2" args="(const byte *digest, const byte *input, size_t length)" -->virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#cad96df68e70d922683e5063057130b2">VerifyDigest</a> (const byte *digest, const byte *input, size_t length)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">use this if your input is in one piece and you don't want to call <a class="el" href="class_hash_transformation.html#afabefaf445b65d3ba0d8e1c0294afe5" title="process more input">Update()</a> and <a class="el" href="class_hash_transformation.html#16c4aecd047015d513feef4ed5b929ba" title="verify that digest is a valid digest for the current message, then reinitialize the...">Verify()</a> separately <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="0b6917657eaec935750fd83e28270d76"></a><!-- doxytag: member="SHA256::CalculateTruncatedDigest" ref="0b6917657eaec935750fd83e28270d76" args="(byte *digest, size_t digestSize, const byte *input, size_t length)" -->virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#0b6917657eaec935750fd83e28270d76">CalculateTruncatedDigest</a> (byte *digest, size_t digestSize, const byte *input, size_t length)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">truncated version of <a class="el" href="class_hash_transformation.html#f8124c4fca23b74bbdc43660bdae692c" title="use this if your input is in one piece and you don't want to call Update() and Final()...">CalculateDigest()</a> <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="0f6069eadf492d970c3eb8cdf656e742"></a><!-- doxytag: member="SHA256::TruncatedVerify" ref="0f6069eadf492d970c3eb8cdf656e742" args="(const byte *digest, size_t digestLength)" -->virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#0f6069eadf492d970c3eb8cdf656e742">TruncatedVerify</a> (const byte *digest, size_t digestLength)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">truncated version of <a class="el" href="class_hash_transformation.html#16c4aecd047015d513feef4ed5b929ba" title="verify that digest is a valid digest for the current message, then reinitialize the...">Verify()</a> <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="7958e99717019e8b9f91672bdfe9e086"></a><!-- doxytag: member="SHA256::VerifyTruncatedDigest" ref="7958e99717019e8b9f91672bdfe9e086" args="(const byte *digest, size_t digestLength, const byte *input, size_t length)" -->virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_hash_transformation.html#7958e99717019e8b9f91672bdfe9e086">VerifyTruncatedDigest</a> (const byte *digest, size_t digestLength, const byte *input, size_t length)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">truncated version of <a class="el" href="class_hash_transformation.html#cad96df68e70d922683e5063057130b2" title="use this if your input is in one piece and you don't want to call Update() and Verify()...">VerifyDigest()</a> <br></td></tr><tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="10038115312a04ab87f043355d421a35"></a><!-- doxytag: member="SHA256::InitState" ref="10038115312a04ab87f043355d421a35" args="(HashWordType *state)" -->static void __cdecl </td><td class="memItemRight" valign="bottom"><a class="el" href="class_s_h_a256.html#10038115312a04ab87f043355d421a35">InitState</a> (<a class="el" href="class_iterated_hash.html#ce0350088eea8679cbe23668d2498c07">HashWordType</a> *state)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="791c4046e1a25a129949366736a623cd"></a><!-- doxytag: member="SHA256::Transform" ref="791c4046e1a25a129949366736a623cd" args="(word32 *digest, const word32 *data)" -->static void __cdecl </td><td class="memItemRight" valign="bottom"><a class="el" href="class_s_h_a256.html#791c4046e1a25a129949366736a623cd">Transform</a> (word32 *digest, const word32 *data)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ef431381a43807496056007d3f7a4bee"></a><!-- doxytag: member="SHA256::StaticAlgorithmName" ref="ef431381a43807496056007d3f7a4bee" args="()" -->static const char *__cdecl </td><td class="memItemRight" valign="bottom"><a class="el" href="class_s_h_a256.html#ef431381a43807496056007d3f7a4bee">StaticAlgorithmName</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="394a6ed0dd2a885652cd203ad4fa5fe0"></a><!-- doxytag: member="SHA256::CorrectEndianess" ref="394a6ed0dd2a885652cd203ad4fa5fe0" args="(HashWordType *out, const HashWordType *in, size_t byteCount)" -->static void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_iterated_hash.html#394a6ed0dd2a885652cd203ad4fa5fe0">CorrectEndianess</a> (<a class="el" href="class_iterated_hash.html#ce0350088eea8679cbe23668d2498c07">HashWordType</a> *out, const <a class="el" href="class_iterated_hash.html#ce0350088eea8679cbe23668d2498c07">HashWordType</a> *in, size_t byteCount)</td></tr><tr><td colspan="2"><br><h2>Static Public Attributes</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="86286d03ba76ccdd7bf3007088250859"></a><!-- doxytag: member="SHA256::DIGESTSIZE" ref="86286d03ba76ccdd7bf3007088250859" args="" -->⌨️ 快捷键说明
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