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著名的密码库Crypto++的文档 C++语言的杰作。程序员必备。

<a name="l00148"></a>00148 
<a name="l00149"></a>00149 <span class="keyword">protected</span>:
<a name="l00150"></a>00150         <span class="keywordtype">void</span> UncheckedSetKey(<span class="keyword">const</span> byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &amp;params);
<a name="l00151"></a>00151 
<a name="l00152"></a><a class="code" href="class_additive_cipher_template.html#2b8c6e4e11ac35c6f267991d0b62f84c">00152</a>         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetBufferByteSize(<span class="keyword">const</span> PolicyInterface &amp;policy)<span class="keyword"> const </span>{<span class="keywordflow">return</span> policy.GetBytesPerIteration() * policy.GetIterationsToBuffer();}
<a name="l00153"></a>00153 
<a name="l00154"></a><a class="code" href="class_additive_cipher_template.html#a0b80a8012abd9061b9522102737069b">00154</a>         <span class="keyword">inline</span> byte * KeystreamBufferBegin() {<span class="keywordflow">return</span> this-&gt;m_buffer.data();}
<a name="l00155"></a><a class="code" href="class_additive_cipher_template.html#99f88c7364a00f78d4afe44f4c962e9e">00155</a>         <span class="keyword">inline</span> byte * KeystreamBufferEnd() {<span class="keywordflow">return</span> (this-&gt;m_buffer.data() + this-&gt;m_buffer.size());}
<a name="l00156"></a>00156 
<a name="l00157"></a><a class="code" href="class_additive_cipher_template.html#dc071d835c1113d83a98ca62b09f0904">00157</a>         <a class="code" href="class_sec_block.html" title="a block of memory allocated using A">SecByteBlock</a> m_buffer;
<a name="l00158"></a><a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">00158</a>         <span class="keywordtype">size_t</span> m_leftOver;
<a name="l00159"></a>00159 };
<a name="l00160"></a>00160 
<a name="l00161"></a><a class="code" href="class_c_f_b___cipher_abstract_policy.html">00161</a> <span class="keyword">class </span>CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CFB_CipherAbstractPolicy
<a name="l00162"></a>00162 {
<a name="l00163"></a>00163 <span class="keyword">public</span>:
<a name="l00164"></a><a class="code" href="class_c_f_b___cipher_abstract_policy.html#9b92dca4aee385aa7bfa76e2ee8bfad5">00164</a>         <span class="keyword">virtual</span> ~CFB_CipherAbstractPolicy() {}
<a name="l00165"></a>00165         <span class="keyword">virtual</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetAlignment() <span class="keyword">const</span> =0;
<a name="l00166"></a>00166         <span class="keyword">virtual</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetBytesPerIteration() <span class="keyword">const</span> =0;
<a name="l00167"></a>00167         <span class="keyword">virtual</span> byte * GetRegisterBegin() =0;
<a name="l00168"></a>00168         <span class="keyword">virtual</span> <span class="keywordtype">void</span> TransformRegister() =0;
<a name="l00169"></a><a class="code" href="class_c_f_b___cipher_abstract_policy.html#d3cf5f1f95bc71115bc9cddf91821886">00169</a>         <span class="keyword">virtual</span> <span class="keywordtype">bool</span> CanIterate()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">false</span>;}
<a name="l00170"></a><a class="code" href="class_c_f_b___cipher_abstract_policy.html#021f82d6099659217e92aabb222200d4">00170</a>         <span class="keyword">virtual</span> <span class="keywordtype">void</span> Iterate(byte *output, <span class="keyword">const</span> byte *input, <a class="code" href="cryptlib_8h.html#353ccabf5ddc119a6a33e92f7b9961c7" title="used to specify a direction for a cipher to operate in (encrypt or decrypt)">CipherDir</a> dir, <span class="keywordtype">size_t</span> iterationCount) {assert(<span class="keyword">false</span>);}
<a name="l00171"></a>00171         <span class="keyword">virtual</span> <span class="keywordtype">void</span> CipherSetKey(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &amp;params, <span class="keyword">const</span> byte *key, <span class="keywordtype">size_t</span> length) =0;
<a name="l00172"></a><a class="code" href="class_c_f_b___cipher_abstract_policy.html#08bdf72613d15644bcd8b2ac3e17dd7c">00172</a>         <span class="keyword">virtual</span> <span class="keywordtype">void</span> CipherResynchronize(<span class="keyword">const</span> byte *iv) {<span class="keywordflow">throw</span> <a class="code" href="class_not_implemented.html" title="exception thrown by a class if a non-implemented method is called">NotImplemented</a>(<span class="stringliteral">"SimpleKeyingInterface: this object doesn't support resynchronization"</span>);}
<a name="l00173"></a>00173 };
<a name="l00174"></a>00174 
<a name="l00175"></a>00175 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> WT, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> W, <span class="keyword">class</span> BASE = CFB_CipherAbstractPolicy&gt;
<a name="l00176"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy.html">00176</a> <span class="keyword">struct </span>CRYPTOPP_NO_VTABLE CFB_CipherConcretePolicy : <span class="keyword">public</span> BASE
<a name="l00177"></a>00177 {
<a name="l00178"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy.html#d2553cceef6af4437f6930ec3af95bf7">00178</a>         <span class="keyword">typedef</span> WT WordType;
<a name="l00179"></a>00179 
<a name="l00180"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy.html#01045749031b5ba60cb7123762c23070">00180</a>         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetAlignment()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">sizeof</span>(WordType);}
<a name="l00181"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy.html#a7b2e21cf767f6f2a4ec03a7d128b692">00181</a>         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetBytesPerIteration()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">sizeof</span>(WordType) * W;}
<a name="l00182"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy.html#128bb497623a649723aa1e2e42eb0233">00182</a>         <span class="keywordtype">bool</span> CanIterate()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">true</span>;}
<a name="l00183"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy.html#620b544b8ec71768e9872315c82ed206">00183</a>         <span class="keywordtype">void</span> TransformRegister() {this-&gt;Iterate(NULL, NULL, <a class="code" href="cryptlib_8h.html#353ccabf5ddc119a6a33e92f7b9961c7244e5e74f856cdd5aafc1005877a2f61">ENCRYPTION</a>, 1);}
<a name="l00184"></a>00184 
<a name="l00185"></a>00185         <span class="keyword">template</span> &lt;<span class="keyword">class</span> B&gt;
<a name="l00186"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html">00186</a>         <span class="keyword">struct </span><a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html">RegisterOutput</a>
<a name="l00187"></a>00187         {
<a name="l00188"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html#220fb3f949134ff82c40d18115a495ef">00188</a>                 <a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html">RegisterOutput</a>(byte *output, <span class="keyword">const</span> byte *input, <a class="code" href="cryptlib_8h.html#353ccabf5ddc119a6a33e92f7b9961c7" title="used to specify a direction for a cipher to operate in (encrypt or decrypt)">CipherDir</a> dir)
<a name="l00189"></a>00189                         : m_output(output), m_input(input), m_dir(dir) {}
<a name="l00190"></a>00190 
<a name="l00191"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html#82f4011e9652312a0216345186fa3ada">00191</a>                 <span class="keyword">inline</span> <a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html">RegisterOutput</a>&amp; operator()(WordType &amp;registerWord)
<a name="l00192"></a>00192                 {
<a name="l00193"></a>00193                         assert(IsAligned&lt;WordType&gt;(m_output));
<a name="l00194"></a>00194                         assert(IsAligned&lt;WordType&gt;(m_input));
<a name="l00195"></a>00195 
<a name="l00196"></a>00196                         <span class="keywordflow">if</span> (!NativeByteOrderIs(B::ToEnum()))
<a name="l00197"></a>00197                                 registerWord = ByteReverse(registerWord);
<a name="l00198"></a>00198 
<a name="l00199"></a>00199                         <span class="keywordflow">if</span> (m_dir == <a class="code" href="cryptlib_8h.html#353ccabf5ddc119a6a33e92f7b9961c7244e5e74f856cdd5aafc1005877a2f61">ENCRYPTION</a>)
<a name="l00200"></a>00200                         {
<a name="l00201"></a>00201                                 <span class="keywordflow">if</span> (m_input == NULL)
<a name="l00202"></a>00202                                         assert(m_output == NULL);
<a name="l00203"></a>00203                                 <span class="keywordflow">else</span>
<a name="l00204"></a>00204                                 {
<a name="l00205"></a>00205                                         WordType ct = *(<span class="keyword">const</span> WordType *)m_input ^ registerWord;
<a name="l00206"></a>00206                                         registerWord = ct;
<a name="l00207"></a>00207                                         *(WordType*)m_output = ct;
<a name="l00208"></a>00208                                         m_input += <span class="keyword">sizeof</span>(WordType);
<a name="l00209"></a>00209                                         m_output += <span class="keyword">sizeof</span>(WordType);
<a name="l00210"></a>00210                                 }
<a name="l00211"></a>00211                         }
<a name="l00212"></a>00212                         <span class="keywordflow">else</span>
<a name="l00213"></a>00213                         {
<a name="l00214"></a>00214                                 WordType ct = *(<span class="keyword">const</span> WordType *)m_input;
<a name="l00215"></a>00215                                 *(WordType*)m_output = registerWord ^ ct;
<a name="l00216"></a>00216                                 registerWord = ct;
<a name="l00217"></a>00217                                 m_input += <span class="keyword">sizeof</span>(WordType);
<a name="l00218"></a>00218                                 m_output += <span class="keyword">sizeof</span>(WordType);
<a name="l00219"></a>00219                         }
<a name="l00220"></a>00220 
<a name="l00221"></a>00221                         <span class="comment">// registerWord is left unreversed so it can be xor-ed with further input</span>
<a name="l00222"></a>00222 
<a name="l00223"></a>00223                         <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00224"></a>00224                 }
<a name="l00225"></a>00225 
<a name="l00226"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html#9e0b19b991f7ea809fdacf4160301ad6">00226</a>                 byte *m_output;
<a name="l00227"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html#dee6a78dc75f70c6b3f485720a2e9448">00227</a>                 <span class="keyword">const</span> byte *m_input;
<a name="l00228"></a><a class="code" href="struct_c_f_b___cipher_concrete_policy_1_1_register_output.html#818280855d8986219a63d7890626c220">00228</a>                 <a class="code" href="cryptlib_8h.html#353ccabf5ddc119a6a33e92f7b9961c7" title="used to specify a direction for a cipher to operate in (encrypt or decrypt)">CipherDir</a> m_dir;
<a name="l00229"></a>00229         };
<a name="l00230"></a>00230 };
<a name="l00231"></a>00231