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<title>Crypto++: OFB_ModePolicy Class Reference</title>
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<h1>OFB_ModePolicy Class Reference</h1><!-- doxytag: class="OFB_ModePolicy" --><!-- doxytag: inherits="ModePolicyCommonTemplate< AdditiveCipherAbstractPolicy >" --><div class="dynheader">
Inheritance diagram for OFB_ModePolicy:</div>
<div class="dynsection">
<div class="center">
<img src="class_o_f_b___mode_policy.gif" usemap="#OFB_ModePolicy_map" alt=""/>
<map id="OFB_ModePolicy_map" name="OFB_ModePolicy_map">
<area href="class_mode_policy_common_template.html" alt="ModePolicyCommonTemplate< AdditiveCipherAbstractPolicy >" shape="rect" coords="377,280,744,304"/>
<area href="class_cipher_mode_base.html" alt="CipherModeBase" shape="rect" coords="188,224,555,248"/>
<area href="struct_additive_cipher_abstract_policy.html" alt="AdditiveCipherAbstractPolicy" shape="rect" coords="565,224,932,248"/>
<area href="class_symmetric_cipher.html" alt="SymmetricCipher" shape="rect" coords="188,168,555,192"/>
<area href="class_simple_keying_interface.html" alt="SimpleKeyingInterface" shape="rect" coords="0,112,367,136"/>
<area href="class_stream_transformation.html" alt="StreamTransformation" shape="rect" coords="377,112,744,136"/>
<area href="class_algorithm.html" alt="Algorithm" shape="rect" coords="377,56,744,80"/>
<area href="class_clonable.html" alt="Clonable" shape="rect" coords="377,0,744,24"/>
</map>
</div>
</div>
<p><a href="class_o_f_b___mode_policy-members.html">List of all members.</a></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><b>IV_Requirement</b> { <br/>
<b>UNIQUE_IV</b> = 0,
<b>RANDOM_IV</b>,
<b>UNPREDICTABLE_RANDOM_IV</b>,
<b>INTERNALLY_GENERATED_IV</b>,
<br/>
<b>NOT_RESYNCHRONIZABLE</b>
<br/>
}</td></tr>
<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a648180dde6c7a32cab590ddba6618d7e"></a><!-- doxytag: member="OFB_ModePolicy::CipherIsRandomAccess" ref="a648180dde6c7a32cab590ddba6618d7e" args="() const " -->
bool </td><td class="memItemRight" valign="bottom"><b>CipherIsRandomAccess</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a79ed234ba58ac65fc5e5fecee7f62618"></a><!-- doxytag: member="OFB_ModePolicy::IVRequirement" ref="a79ed234ba58ac65fc5e5fecee7f62618" args="() const " -->
IV_Requirement </td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_f_b___mode_policy.html#a79ed234ba58ac65fc5e5fecee7f62618">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" align="right" valign="top"><a class="anchor" id="a8224beab6f15889bae44d06efb8c01f1"></a><!-- doxytag: member="OFB_ModePolicy::MinKeyLength" ref="a8224beab6f15889bae44d06efb8c01f1" args="() const " -->
size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_cipher_mode_base.html#a8224beab6f15889bae44d06efb8c01f1">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" align="right" valign="top"><a class="anchor" id="ae2b61a0b36c284db0500cbd82a92aa09"></a><!-- doxytag: member="OFB_ModePolicy::MaxKeyLength" ref="ae2b61a0b36c284db0500cbd82a92aa09" args="() const " -->
size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_cipher_mode_base.html#ae2b61a0b36c284db0500cbd82a92aa09">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" align="right" valign="top"><a class="anchor" id="a78845a270a50fc42f0a952e35c781ba6"></a><!-- doxytag: member="OFB_ModePolicy::DefaultKeyLength" ref="a78845a270a50fc42f0a952e35c781ba6" args="() const " -->
size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_cipher_mode_base.html#a78845a270a50fc42f0a952e35c781ba6">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" align="right" valign="top"><a class="anchor" id="a8c1ffbf107876873abb5039b2facf421"></a><!-- doxytag: member="OFB_ModePolicy::GetValidKeyLength" ref="a8c1ffbf107876873abb5039b2facf421" args="(size_t n) const " -->
size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_cipher_mode_base.html#a8c1ffbf107876873abb5039b2facf421">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" align="right" valign="top"><a class="anchor" id="a7e6c0f7dd7b952e4f6d46b16b2b2a5ad"></a><!-- doxytag: member="OFB_ModePolicy::IsValidKeyLength" ref="a7e6c0f7dd7b952e4f6d46b16b2b2a5ad" args="(size_t n) const " -->
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_cipher_mode_base.html#a7e6c0f7dd7b952e4f6d46b16b2b2a5ad">IsValidKeyLength</a> (size_t n) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns whether n is a valid key length <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a620b247030548f559a9b426e47234f12"></a><!-- doxytag: member="OFB_ModePolicy::OptimalDataAlignment" ref="a620b247030548f559a9b426e47234f12" args="() const " -->
unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_cipher_mode_base.html#a620b247030548f559a9b426e47234f12">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" align="right" valign="top"><a class="anchor" id="a353498711671d0f44a87fc27211c3d1c"></a><!-- doxytag: member="OFB_ModePolicy::IVSize" ref="a353498711671d0f44a87fc27211c3d1c" args="() const " -->
unsigned int </td><td class="memItemRight" valign="bottom"><b>IVSize</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a9bccbd9e2c1a76282ddb6f1a79b3d80e"></a><!-- doxytag: member="OFB_ModePolicy::SetCipher" ref="a9bccbd9e2c1a76282ddb6f1a79b3d80e" args="(BlockCipher &cipher)" -->
void </td><td class="memItemRight" valign="bottom"><b>SetCipher</b> (<a class="el" href="class_block_cipher.html">BlockCipher</a> &cipher)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a6bc4f26f7c59f484073d04829274875a"></a><!-- doxytag: member="OFB_ModePolicy::SetCipherWithIV" ref="a6bc4f26f7c59f484073d04829274875a" args="(BlockCipher &cipher, const byte *iv, int feedbackSize=0)" -->
void </td><td class="memItemRight" valign="bottom"><b>SetCipherWithIV</b> (<a class="el" href="class_block_cipher.html">BlockCipher</a> &cipher, const byte *iv, int feedbackSize=0)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7">SetKey</a> (const byte *key, size_t length, const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> &params=<a class="el" href="cryptlib_8h.html#ad3205973dd1afa14090a683154c1109c">g_nullNameValuePairs</a>)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">set or reset the key of this object <a href="#adf3c29b3ef3af74788a58c7c49887fd7"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a0401f9c67930805180964bc02ae0ac1c"></a><!-- doxytag: member="OFB_ModePolicy::SetKeyWithRounds" ref="a0401f9c67930805180964bc02ae0ac1c" args="(const byte *key, size_t length, int rounds)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a0401f9c67930805180964bc02ae0ac1c">SetKeyWithRounds</a> (const byte *key, size_t length, int rounds)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">calls <a class="el" href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7" title="set or reset the key of this object">SetKey()</a> with an <a class="el" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> object that just specifies "Rounds" <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5b4e358c514fd743840967bc595a34c2"></a><!-- doxytag: member="OFB_ModePolicy::SetKeyWithIV" ref="a5b4e358c514fd743840967bc595a34c2" args="(const byte *key, size_t length, const byte *iv, size_t ivLength)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a5b4e358c514fd743840967bc595a34c2">SetKeyWithIV</a> (const byte *key, size_t length, const byte *iv, size_t ivLength)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">calls <a class="el" href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7" title="set or reset the key of this object">SetKey()</a> with an <a class="el" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> object that just specifies "IV" <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac25e27eaeae2e909741c07de93caef49"></a><!-- doxytag: member="OFB_ModePolicy::SetKeyWithIV" ref="ac25e27eaeae2e909741c07de93caef49" args="(const byte *key, size_t length, const byte *iv)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#ac25e27eaeae2e909741c07de93caef49">SetKeyWithIV</a> (const byte *key, size_t length, const byte *iv)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">calls <a class="el" href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7" title="set or reset the key of this object">SetKey()</a> with an <a class="el" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> object that just specifies "IV" <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#ad263f4a96fa8b4e7d01fea8ccaae9d3b">IsResynchronizable</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns whether this object can be resynchronized (i.e. supports initialization vectors) <a href="#ad263f4a96fa8b4e7d01fea8ccaae9d3b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a26680fc02b91534a522b5754cdcdcb46"></a><!-- doxytag: member="OFB_ModePolicy::CanUseRandomIVs" ref="a26680fc02b91534a522b5754cdcdcb46" args="() const " -->
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a26680fc02b91534a522b5754cdcdcb46">CanUseRandomIVs</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns whether this object can use random IVs (in addition to ones returned by GetNextIV) <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a307463503d7a4400ffafe03a683e1dbb"></a><!-- doxytag: member="OFB_ModePolicy::CanUsePredictableIVs" ref="a307463503d7a4400ffafe03a683e1dbb" args="() const " -->
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a307463503d7a4400ffafe03a683e1dbb">CanUsePredictableIVs</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns whether this object can use random but possibly predictable IVs (in addition to ones returned by GetNextIV) <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a9c47590ef06335b34bdaf272fd37ef4d"></a><!-- doxytag: member="OFB_ModePolicy::CanUseStructuredIVs" ref="a9c47590ef06335b34bdaf272fd37ef4d" args="() const " -->
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a9c47590ef06335b34bdaf272fd37ef4d">CanUseStructuredIVs</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns whether this object can use structured IVs, for example a counter (in addition to ones returned by GetNextIV) <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5b2090b3c27540aa3db0281406fedb38"></a><!-- doxytag: member="OFB_ModePolicy::DefaultIVLength" ref="a5b2090b3c27540aa3db0281406fedb38" args="() const " -->
unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a5b2090b3c27540aa3db0281406fedb38">DefaultIVLength</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns default length of IVs accepted by this object <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4450efa449a2e04a31b6371821e650f9"></a><!-- doxytag: member="OFB_ModePolicy::MinIVLength" ref="a4450efa449a2e04a31b6371821e650f9" args="() const " -->
virtual unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a4450efa449a2e04a31b6371821e650f9">MinIVLength</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns minimal length of IVs accepted by this object <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a308799c135440e57a583defe3860f02e"></a><!-- doxytag: member="OFB_ModePolicy::MaxIVLength" ref="a308799c135440e57a583defe3860f02e" args="() const " -->
virtual unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a308799c135440e57a583defe3860f02e">MaxIVLength</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns maximal length of IVs accepted by this object <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae576137a46ca56005e82f1505cf3cccc"></a><!-- doxytag: member="OFB_ModePolicy::Resynchronize" ref="ae576137a46ca56005e82f1505cf3cccc" args="(const byte *iv, int ivLength=-1)" -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#ae576137a46ca56005e82f1505cf3cccc">Resynchronize</a> (const byte *iv, int ivLength=-1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">resynchronize with an IV. ivLength=-1 means use IVSize() <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_simple_keying_interface.html#a917224bb6df7431d6469e7a10feac5fa">GetNextIV</a> (<a class="el" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, byte *IV)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">get a secure IV for the next message <a href="#a917224bb6df7431d6469e7a10feac5fa"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_stream_transformation.html">StreamTransformation</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a8c9304fff5af593ee68d3cf0d33c06e9">Ref</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">return a reference to this object, <a href="#a8c9304fff5af593ee68d3cf0d33c06e9"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3638ff7580edb42a5b1c367e53a7436f"></a><!-- doxytag: member="OFB_ModePolicy::MandatoryBlockSize" ref="a3638ff7580edb42a5b1c367e53a7436f" args="() const " -->
virtual unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a3638ff7580edb42a5b1c367e53a7436f">MandatoryBlockSize</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns block size, if input must be processed in blocks, otherwise 1 <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#ae79457bcbafc980672d88ee54ed4ac66">OptimalBlockSize</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns the input block size that is most efficient for this cipher <a href="#ae79457bcbafc980672d88ee54ed4ac66"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a94b4e1d14edde1fdde38361bce9ca4c6"></a><!-- doxytag: member="OFB_ModePolicy::GetOptimalBlockSizeUsed" ref="a94b4e1d14edde1fdde38361bce9ca4c6" args="() const " -->
virtual unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a94b4e1d14edde1fdde38361bce9ca4c6">GetOptimalBlockSizeUsed</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns how much of the current block is used up <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a26feabde21bc4d1783195969733e3bb0">ProcessData</a> (byte *outString, const byte *inString, size_t length)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">encrypt or decrypt an array of bytes of specified length <a href="#a26feabde21bc4d1783195969733e3bb0"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a0668b78edaea082f87bf3e878c4c02f7">ProcessLastBlock</a> (byte *outString, const byte *inString, size_t length)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">for ciphers where the last block of data is special, encrypt or decrypt the last block of data <a href="#a0668b78edaea082f87bf3e878c4c02f7"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a2eb96f3a8fae23cb9f85acb288e3bcbe"></a><!-- doxytag: member="OFB_ModePolicy::MinLastBlockSize" ref="a2eb96f3a8fae23cb9f85acb288e3bcbe" args="() const " -->
virtual unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a2eb96f3a8fae23cb9f85acb288e3bcbe">MinLastBlockSize</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns the minimum size of the last block, 0 indicating the last block is not special <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac00f3fcc21f33f11c8efa4de67ff7774"></a><!-- doxytag: member="OFB_ModePolicy::ProcessString" ref="ac00f3fcc21f33f11c8efa4de67ff7774" args="(byte *inoutString, size_t length)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#ac00f3fcc21f33f11c8efa4de67ff7774">ProcessString</a> (byte *inoutString, size_t length)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">same as ProcessData(inoutString, inoutString, length) <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a17951cb36412763e0d6bd9696177175d"></a><!-- doxytag: member="OFB_ModePolicy::ProcessString" ref="a17951cb36412763e0d6bd9696177175d" args="(byte *outString, const byte *inString, size_t length)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a17951cb36412763e0d6bd9696177175d">ProcessString</a> (byte *outString, const byte *inString, size_t length)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">same as ProcessData(outString, inString, length) <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a71a9bd33526fc7f227050075e7a78106"></a><!-- doxytag: member="OFB_ModePolicy::ProcessByte" ref="a71a9bd33526fc7f227050075e7a78106" args="(byte input)" -->
byte </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a71a9bd33526fc7f227050075e7a78106">ProcessByte</a> (byte input)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">implemented as {ProcessData(&input, &input, 1); return input;} <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad7286fd9a993de0a147b0c20f660bfa5"></a><!-- doxytag: member="OFB_ModePolicy::IsRandomAccess" ref="ad7286fd9a993de0a147b0c20f660bfa5" args="() const =0" -->
virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#ad7286fd9a993de0a147b0c20f660bfa5">IsRandomAccess</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns whether this cipher supports random access <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a7bfbac3f2e43b50d1e16e6b4b2d2e48a"></a><!-- doxytag: member="OFB_ModePolicy::Seek" ref="a7bfbac3f2e43b50d1e16e6b4b2d2e48a" args="(lword n)" -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a7bfbac3f2e43b50d1e16e6b4b2d2e48a">Seek</a> (lword n)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">for random access ciphers, seek to an absolute position <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a583bc0edbd8a11c91da53395298c50de"></a><!-- doxytag: member="OFB_ModePolicy::IsSelfInverting" ref="a583bc0edbd8a11c91da53395298c50de" args="() const =0" -->
virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a583bc0edbd8a11c91da53395298c50de">IsSelfInverting</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns whether this transformation is self-inverting (e.g. xor with a keystream) <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3244f76963a12a5ab6112326c7af9724"></a><!-- doxytag: member="OFB_ModePolicy::IsForwardTransformation" ref="a3244f76963a12a5ab6112326c7af9724" args="() const =0" -->
virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_stream_transformation.html#a3244f76963a12a5ab6112326c7af9724">IsForwardTransformation</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns whether this is an encryption object <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acd21c6715add4884fa043eaf51655039"></a><!-- doxytag: member="OFB_ModePolicy::AlgorithmName" ref="acd21c6715add4884fa043eaf51655039" args="() const " -->
virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="class_algorithm.html#acd21c6715add4884fa043eaf51655039">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" align="right" valign="top"><a class="anchor" id="a24b43349a71e1f98508eeb10b31a0a62"></a><!-- doxytag: member="OFB_ModePolicy::Clone" ref="a24b43349a71e1f98508eeb10b31a0a62" args="() const " -->
virtual <a class="el" href="class_clonable.html">Clonable</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_clonable.html#a24b43349a71e1f98508eeb10b31a0a62">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" align="right" valign="top"><a class="anchor" id="a79a5290262325372d5133797086afd28"></a><!-- doxytag: member="OFB_ModePolicy::GetOptimalBlockSize" ref="a79a5290262325372d5133797086afd28" args="() const " -->
virtual unsigned int </td><td class="memItemRight" valign="bottom"><b>GetOptimalBlockSize</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a04a2b0cebd5633dd4297d9a8000ac971"></a><!-- doxytag: member="OFB_ModePolicy::CanOperateKeystream" ref="a04a2b0cebd5633dd4297d9a8000ac971" args="() const " -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>CanOperateKeystream</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae948f2e69229ba39837e498a464606d4"></a><!-- doxytag: member="OFB_ModePolicy::OperateKeystream" ref="ae948f2e69229ba39837e498a464606d4" args="(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)" -->
virtual void </td><td class="memItemRight" valign="bottom"><b>OperateKeystream</b> (KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8fce38d2b7d84732fc3efea410b82d54"></a><!-- doxytag: member="OFB_ModePolicy::SeekToIteration" ref="a8fce38d2b7d84732fc3efea410b82d54" args="(lword iterationCount)" -->
virtual void </td><td class="memItemRight" valign="bottom"><b>SeekToIteration</b> (lword iterationCount)</td></tr>
<tr><td colspan="2"><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a20ee768bb4173bc4fb3f3659519d7113"></a><!-- doxytag: member="OFB_ModePolicy::StaticAlgorithmName" ref="a20ee768bb4173bc4fb3f3659519d7113" args="()" -->
static const char *__cdecl </td><td class="memItemRight" valign="bottom"><b>StaticAlgorithmName</b> ()</td></tr>
<tr><td colspan="2"><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a35fa9c9e616b0145c1e21745de48a684"></a><!-- doxytag: member="OFB_ModePolicy::BlockSize" ref="a35fa9c9e616b0145c1e21745de48a684" args="() const " -->
unsigned int </td><td class="memItemRight" valign="bottom"><b>BlockSize</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a687cdab140bc5c733bc43299a97c2a17"></a><!-- doxytag: member="OFB_ModePolicy::SetFeedbackSize" ref="a687cdab140bc5c733bc43299a97c2a17" args="(unsigned int feedbackSize)" -->
virtual void </td><td class="memItemRight" valign="bottom"><b>SetFeedbackSize</b> (unsigned int feedbackSize)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8c864c16ce0eb014699c0a61adcc6836"></a><!-- doxytag: member="OFB_ModePolicy::ResizeBuffers" ref="a8c864c16ce0eb014699c0a61adcc6836" args="()" -->
virtual void </td><td class="memItemRight" valign="bottom"><b>ResizeBuffers</b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acffa20377045ee6a2399bf2070b33fb3"></a><!-- doxytag: member="OFB_ModePolicy::GetAlgorithm" ref="acffa20377045ee6a2399bf2070b33fb3" args="() const " -->
const <a class="el" href="class_algorithm.html">Algorithm</a> & </td><td class="memItemRight" valign="bottom"><b>GetAlgorithm</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a911df1b09f35e18a19e474942971947b"></a><!-- doxytag: member="OFB_ModePolicy::UncheckedSetKey" ref="a911df1b09f35e18a19e474942971947b" args="(const byte *key, unsigned int length, const NameValuePairs &params)=0" -->
virtual void </td><td class="memItemRight" valign="bottom"><b>UncheckedSetKey</b> (const byte *key, unsigned int length, const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> &params)=0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a32b2095542b18025814118734bf34da2"></a><!-- doxytag: member="OFB_ModePolicy::ThrowIfInvalidKeyLength" ref="a32b2095542b18025814118734bf34da2" args="(size_t length)" -->
void </td><td class="memItemRight" valign="bottom"><b>ThrowIfInvalidKeyLength</b> (size_t length)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae60d9774af66fc673fe6139f5880c477"></a><!-- doxytag: member="OFB_ModePolicy::ThrowIfResynchronizable" ref="ae60d9774af66fc673fe6139f5880c477" args="()" -->
void </td><td class="memItemRight" valign="bottom"><b>ThrowIfResynchronizable</b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac687add7d0a09c626d85b77714bbd114"></a><!-- doxytag: member="OFB_ModePolicy::ThrowIfInvalidIV" ref="ac687add7d0a09c626d85b77714bbd114" args="(const byte *iv)" -->
void </td><td class="memItemRight" valign="bottom"><b>ThrowIfInvalidIV</b> (const byte *iv)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aaae6c529f861c47193f3498719e2dc48"></a><!-- doxytag: member="OFB_ModePolicy::ThrowIfInvalidIVLength" ref="aaae6c529f861c47193f3498719e2dc48" args="(int size)" -->
size_t </td><td class="memItemRight" valign="bottom"><b>ThrowIfInvalidIVLength</b> (int size)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a66ce967c9b8717baa10b4bdb2312d08d"></a><!-- doxytag: member="OFB_ModePolicy::GetIVAndThrowIfInvalid" ref="a66ce967c9b8717baa10b4bdb2312d08d" args="(const NameValuePairs &params, size_t &size)" -->
const byte * </td><td class="memItemRight" valign="bottom"><b>GetIVAndThrowIfInvalid</b> (const <a class="el" href="class_name_value_pairs.html">NameValuePairs</a> &params, size_t &size)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a719efcf12f0de461b951830b8131b36a"></a><!-- doxytag: member="OFB_ModePolicy::AssertValidKeyLength" ref="a719efcf12f0de461b951830b8131b36a" args="(size_t length) const " -->
void </td><td class="memItemRight" valign="bottom"><b>AssertValidKeyLength</b> (size_t length) const </td></tr>
<tr><td colspan="2"><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ab6c63ae5b5521b462912b1bb2d766989"></a><!-- doxytag: member="OFB_ModePolicy::m_cipher" ref="ab6c63ae5b5521b462912b1bb2d766989" args="" -->
<a class="el" href="class_block_cipher.html">BlockCipher</a> * </td><td class="memItemRight" valign="bottom"><b>m_cipher</b></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="abec6a6cb74251544b173d639221fe324"></a><!-- doxytag: member="OFB_ModePolicy::m_register" ref="abec6a6cb74251544b173d639221fe324" args="" -->
<a class="el" href="class_sec_block.html">AlignedSecByteBlock</a> </td><td class="memItemRight" valign="bottom"><b>m_register</b></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>Definition at line <a class="el" href="modes_8h_source.html#l00123">123</a> of file <a class="el" href="modes_8h_source.html">modes.h</a>.</p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="adf3c29b3ef3af74788a58c7c49887fd7"></a><!-- doxytag: member="OFB_ModePolicy::SetKey" ref="adf3c29b3ef3af74788a58c7c49887fd7" args="(const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)" -->
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<td class="memname">void SimpleKeyingInterface::SetKey </td>
<td>(</td>
<td class="paramtype">const byte * </td>
<td class="paramname"> <em>key</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>length</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>params</em> = <code><a class="el" href="cryptlib_8h.html#ad3205973dd1afa14090a683154c1109c">g_nullNameValuePairs</a></code></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [virtual, inherited]</code></td>
</tr>
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<p>set or reset the key of this object </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>params</em> </td><td>is used to specify Rounds, BlockSize, etc. </td></tr>
</table>
</dd>
</dl>
<p>Reimplemented in <a class="el" href="class_authenticated_symmetric_cipher_base.html#aea1353c1d0a94c3f81ebcf53f6b7ea57">AuthenticatedSymmetricCipherBase</a>, and <a class="el" href="class_e_c_b___one_way.html#aea389c964114b73390dd81d836124461">ECB_OneWay</a>.</p>
<p>Definition at line <a class="el" href="cryptlib_8cpp_source.html#l00053">53</a> of file <a class="el" href="cryptlib_8cpp_source.html">cryptlib.cpp</a>.</p>
<p>Referenced by <a class="el" href="cryptlib_8cpp_source.html#l00064">SimpleKeyingInterface::SetKeyWithIV()</a>, and <a class="el" href="cryptlib_8cpp_source.html#l00059">SimpleKeyingInterface::SetKeyWithRounds()</a>.</p>
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<a class="anchor" id="ad263f4a96fa8b4e7d01fea8ccaae9d3b"></a><!-- doxytag: member="OFB_ModePolicy::IsResynchronizable" ref="ad263f4a96fa8b4e7d01fea8ccaae9d3b" args="() const " -->
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<td class="memname">bool SimpleKeyingInterface::IsResynchronizable </td>
<td>(</td>
<td class="paramname"></td>
<td> ) </td>
<td> const<code> [inline, inherited]</code></td>
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<p>returns whether this object can be resynchronized (i.e. supports initialization vectors) </p>
<p>If this function returns true, and no IV is passed to <a class="el" href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7" title="set or reset the key of this object">SetKey()</a> and <a class="el" href="class_simple_keying_interface.html#a9c47590ef06335b34bdaf272fd37ef4d" title="returns whether this object can use structured IVs, for example a counter (in addition...">CanUseStructuredIVs()</a>==true, an IV of all 0's will be assumed. </p>
<p>Definition at line <a class="el" href="cryptlib_8h_source.html#l00393">393</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
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<a class="anchor" id="a917224bb6df7431d6469e7a10feac5fa"></a><!-- doxytag: member="OFB_ModePolicy::GetNextIV" ref="a917224bb6df7431d6469e7a10feac5fa" args="(RandomNumberGenerator &rng, byte *IV)" -->
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<td class="memname">void SimpleKeyingInterface::GetNextIV </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">byte * </td>
<td class="paramname"> <em>IV</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [virtual, inherited]</code></td>
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</table>
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<p>get a secure IV for the next message </p>
<p>This method should be called after you finish encrypting one message and are ready to start the next one. After calling it, you must call <a class="el" href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7" title="set or reset the key of this object">SetKey()</a> or <a class="el" href="class_simple_keying_interface.html#ae576137a46ca56005e82f1505cf3cccc" title="resynchronize with an IV. ivLength=-1 means use IVSize()">Resynchronize()</a> before using this object again. This method is not implemented on decryption objects. </p>
<p>Reimplemented in <a class="el" href="class_v_m_a_c___base.html#abd5685ab3eaf6ec272f7e062c3194c6c">VMAC_Base</a>.</p>
<p>Definition at line <a class="el" href="cryptlib_8cpp_source.html#l00129">129</a> of file <a class="el" href="cryptlib_8cpp_source.html">cryptlib.cpp</a>.</p>
<p>References <a class="el" href="cryptlib_8cpp_source.html#l00257">RandomNumberGenerator::GenerateBlock()</a>.</p>
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<a class="anchor" id="a8c9304fff5af593ee68d3cf0d33c06e9"></a><!-- doxytag: member="OFB_ModePolicy::Ref" ref="a8c9304fff5af593ee68d3cf0d33c06e9" args="()" -->
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<td class="memname"><a class="el" href="class_stream_transformation.html">StreamTransformation</a>& StreamTransformation::Ref </td>
<td>(</td>
<td class="paramname"></td>
<td> ) </td>
<td><code> [inline, inherited]</code></td>
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<p>return a reference to this object, </p>
<p>This function is useful for passing a temporary <a class="el" href="class_stream_transformation.html" title="interface for the data processing part of stream ciphers">StreamTransformation</a> object to a function that takes a non-const reference. </p>
<p>Definition at line <a class="el" href="cryptlib_8h_source.html#l00483">483</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
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<a class="anchor" id="ae79457bcbafc980672d88ee54ed4ac66"></a><!-- doxytag: member="OFB_ModePolicy::OptimalBlockSize" ref="ae79457bcbafc980672d88ee54ed4ac66" args="() const " -->
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<td class="memname">virtual unsigned int StreamTransformation::OptimalBlockSize </td>
<td>(</td>
<td class="paramname"></td>
<td> ) </td>
<td> const<code> [inline, virtual, inherited]</code></td>
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<p>returns the input block size that is most efficient for this cipher </p>
<dl class="note"><dt><b>Note:</b></dt><dd>optimal input length is n * <a class="el" href="class_stream_transformation.html#ae79457bcbafc980672d88ee54ed4ac66" title="returns the input block size that is most efficient for this cipher">OptimalBlockSize()</a> - <a class="el" href="class_stream_transformation.html#a94b4e1d14edde1fdde38361bce9ca4c6" title="returns how much of the current block is used up">GetOptimalBlockSizeUsed()</a> for any n > 0 </dd></dl>
<p>Reimplemented in <a class="el" href="class_e_c_b___one_way.html#ae525b1874f11cd0aa85f2d93c17f9d08">ECB_OneWay</a>.</p>
<p>Definition at line <a class="el" href="cryptlib_8h_source.html#l00490">490</a> of file <a class="el" href="cryptlib_8h_source.html">cryptlib.h</a>.</p>
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<a class="anchor" id="a26feabde21bc4d1783195969733e3bb0"></a><!-- doxytag: member="OFB_ModePolicy::ProcessData" ref="a26feabde21bc4d1783195969733e3bb0" args="(byte *outString, const byte *inString, size_t length)=0" -->
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<td class="memname">virtual void StreamTransformation::ProcessData </td>
<td>(</td>
<td class="paramtype">byte * </td>
<td class="paramname"> <em>outString</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const byte * </td>
<td class="paramname"> <em>inString</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>length</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [pure virtual, inherited]</code></td>
</tr>
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<p>encrypt or decrypt an array of bytes of specified length </p>
<dl class="note"><dt><b>Note:</b></dt><dd>either inString == outString, or they don't overlap </dd></dl>
<p>Implemented in <a class="el" href="class_weak1_1_1_a_r_c4___base.html#acde17b2a24427c2275efc9c9d24e5660">Weak1::ARC4_Base</a>, <a class="el" href="class_authenticated_symmetric_cipher_base.html#a2887c0e4c7e303bdb51dfd869b16189f">AuthenticatedSymmetricCipherBase</a>, <a class="el" href="class_public_blum_blum_shub.html#afb03a58653cb83c9a9013f3a57105bfc">PublicBlumBlumShub</a>, <a class="el" href="class_e_c_b___one_way.html#a4d8c291d821d86f7f4caa3cf95d1834c">ECB_OneWay</a>, <a class="el" href="class_c_b_c___encryption.html#ad4efdd9fd6d832b234771754cd51d20a">CBC_Encryption</a>, and <a class="el" href="class_c_b_c___decryption.html#ad3dfde8d73d036dc144e8750a6a3b1d1">CBC_Decryption</a>.</p>
<p>Referenced by <a class="el" href="authenc_8cpp_source.html#l00104">AuthenticatedSymmetricCipherBase::ProcessData()</a>, and <a class="el" href="cryptlib_8cpp_source.html#l00187">StreamTransformation::ProcessLastBlock()</a>.</p>
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<a class="anchor" id="a0668b78edaea082f87bf3e878c4c02f7"></a><!-- doxytag: member="OFB_ModePolicy::ProcessLastBlock" ref="a0668b78edaea082f87bf3e878c4c02f7" args="(byte *outString, const byte *inString, size_t length)" -->
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<td class="memname">void StreamTransformation::ProcessLastBlock </td>
<td>(</td>
<td class="paramtype">byte * </td>
<td class="paramname"> <em>outString</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const byte * </td>
<td class="paramname"> <em>inString</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"> <em>length</em></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [virtual, inherited]</code></td>
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<p>for ciphers where the last block of data is special, encrypt or decrypt the last block of data </p>
<p>For now the only use of this function is for CBC-CTS mode. </p>
<p>Reimplemented in <a class="el" href="class_c_b_c___c_t_s___encryption.html#afa5e227b89c39bff1386df7cebaa5f32">CBC_CTS_Encryption</a>, and <a class="el" href="class_c_b_c___c_t_s___decryption.html#a2f23aad280dc56920f16ea0711b39d89">CBC_CTS_Decryption</a>.</p>
<p>Definition at line <a class="el" href="cryptlib_8cpp_source.html#l00187">187</a> of file <a class="el" href="cryptlib_8cpp_source.html">cryptlib.cpp</a>.</p>
<p>References <a class="el" href="cryptlib_8h_source.html#l00350">Algorithm::AlgorithmName()</a>, <a class="el" href="cryptlib_8h_source.html#l00486">StreamTransformation::MandatoryBlockSize()</a>, <a class="el" href="cryptlib_8h_source.html#l00505">StreamTransformation::MinLastBlockSize()</a>, and <a class="el" href="class_stream_transformation.html#a26feabde21bc4d1783195969733e3bb0">StreamTransformation::ProcessData()</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="modes_8h_source.html">modes.h</a></li>
<li><a class="el" href="modes_8cpp_source.html">modes.cpp</a></li>
</ul>
</div>
<hr size="1"/><address style="text-align: right;"><small>Generated on 9 Dec 2009 for Crypto++ by
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address>
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