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<a name="l00122"></a>00122 <a name="l00123"></a>00123 <span class="keywordflow">if</span> (length > 0)<a name="l00124"></a>00124 {<a name="l00125"></a>00125 policy.WriteKeystream(<a class="code" href="class_additive_cipher_template.html#dc071d835c1113d83a98ca62b09f0904">m_buffer</a>, bufferIterations);<a name="l00126"></a>00126 xorbuf(outString, inString, <a class="code" href="class_additive_cipher_template.html#a0b80a8012abd9061b9522102737069b">KeystreamBufferBegin</a>(), length);<a name="l00127"></a>00127 <a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> = bytesPerIteration - length;<a name="l00128"></a>00128 }<a name="l00129"></a>00129 }<a name="l00130"></a>00130 <a name="l00131"></a>00131 <span class="keyword">template</span> <<span class="keyword">class</span> S><a name="l00132"></a><a class="code" href="class_additive_cipher_template.html#39e0af00d00ccf3f8e0f432442221c54">00132</a> <span class="keywordtype">void</span> <a class="code" href="class_additive_cipher_template.html#39e0af00d00ccf3f8e0f432442221c54">AdditiveCipherTemplate<S>::Resynchronize</a>(<span class="keyword">const</span> byte *iv)<a name="l00133"></a>00133 {<a name="l00134"></a>00134 <a class="code" href="class_additive_cipher_template.html#79b269d3b9def1c573eb8b73926bbfdf">PolicyInterface</a> &policy = this->AccessPolicy();<a name="l00135"></a>00135 <a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> = 0;<a name="l00136"></a>00136 <a class="code" href="class_additive_cipher_template.html#dc071d835c1113d83a98ca62b09f0904">m_buffer</a>.<a class="code" href="class_sec_block.html#90d46e577c951d81a2d25a4742a3e979" title="change size, without preserving contents">New</a>(<a class="code" href="class_additive_cipher_template.html#2b8c6e4e11ac35c6f267991d0b62f84c">GetBufferByteSize</a>(policy));<a name="l00137"></a>00137 policy.CipherResynchronize(<a class="code" href="class_additive_cipher_template.html#dc071d835c1113d83a98ca62b09f0904">m_buffer</a>, iv);<a name="l00138"></a>00138 }<a name="l00139"></a>00139 <a name="l00140"></a>00140 <span class="keyword">template</span> <<span class="keyword">class</span> BASE><a name="l00141"></a><a class="code" href="class_additive_cipher_template.html#68d4dc2904da4df5a7ead785ad7bc67e">00141</a> <span class="keywordtype">void</span> <a class="code" href="class_additive_cipher_template.html#68d4dc2904da4df5a7ead785ad7bc67e">AdditiveCipherTemplate<BASE>::Seek</a>(lword position)<a name="l00142"></a>00142 {<a name="l00143"></a>00143 <a class="code" href="class_additive_cipher_template.html#79b269d3b9def1c573eb8b73926bbfdf">PolicyInterface</a> &policy = this->AccessPolicy();<a name="l00144"></a>00144 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bytesPerIteration = policy.GetBytesPerIteration();<a name="l00145"></a>00145 <a name="l00146"></a>00146 policy.SeekToIteration(position / bytesPerIteration);<a name="l00147"></a>00147 position %= bytesPerIteration;<a name="l00148"></a>00148 <a name="l00149"></a>00149 <span class="keywordflow">if</span> (position > 0)<a name="l00150"></a>00150 {<a name="l00151"></a>00151 policy.WriteKeystream(<a class="code" href="class_additive_cipher_template.html#dc071d835c1113d83a98ca62b09f0904">m_buffer</a>, 1);<a name="l00152"></a>00152 <a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> = bytesPerIteration - (<span class="keywordtype">unsigned</span> int)position;<a name="l00153"></a>00153 }<a name="l00154"></a>00154 <span class="keywordflow">else</span><a name="l00155"></a>00155 <a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> = 0;<a name="l00156"></a>00156 }<a name="l00157"></a>00157 <a name="l00158"></a>00158 <span class="keyword">template</span> <<span class="keyword">class</span> BASE><a name="l00159"></a><a class="code" href="class_c_f_b___cipher_template.html#ecb03ad65083bbba86bdffcaf5d79da6">00159</a> <span class="keywordtype">void</span> <a class="code" href="class_c_f_b___cipher_template.html#ecb03ad65083bbba86bdffcaf5d79da6">CFB_CipherTemplate<BASE>::UncheckedSetKey</a>(<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> &params)<a name="l00160"></a>00160 {<a name="l00161"></a>00161 <a class="code" href="class_c_f_b___cipher_template.html#9e72e3524dd351fd0e87382fe84cd306">PolicyInterface</a> &policy = this->AccessPolicy();<a name="l00162"></a>00162 policy.CipherSetKey(params, key, length);<a name="l00163"></a>00163 <a name="l00164"></a>00164 <span class="keywordflow">if</span> (this->IsResynchronizable())<a name="l00165"></a>00165 policy.CipherResynchronize(this->GetIVAndThrowIfInvalid(params));<a name="l00166"></a>00166 <a name="l00167"></a>00167 <a class="code" href="class_c_f_b___cipher_template.html#1360b5b5f16118705792176b1847027a">m_leftOver</a> = policy.GetBytesPerIteration();<a name="l00168"></a>00168 }<a name="l00169"></a>00169 <a name="l00170"></a>00170 <span class="keyword">template</span> <<span class="keyword">class</span> BASE><a name="l00171"></a><a class="code" href="class_c_f_b___cipher_template.html#04b02d63762cbccb367626fcbdb90f68">00171</a> <span class="keywordtype">void</span> <a class="code" href="class_c_f_b___cipher_template.html#04b02d63762cbccb367626fcbdb90f68">CFB_CipherTemplate<BASE>::Resynchronize</a>(<span class="keyword">const</span> byte *iv)<a name="l00172"></a>00172 {<a name="l00173"></a>00173 <a class="code" href="class_c_f_b___cipher_template.html#9e72e3524dd351fd0e87382fe84cd306">PolicyInterface</a> &policy = this->AccessPolicy();<a name="l00174"></a>00174 policy.CipherResynchronize(iv);<a name="l00175"></a>00175 <a class="code" href="class_c_f_b___cipher_template.html#1360b5b5f16118705792176b1847027a">m_leftOver</a> = policy.GetBytesPerIteration();<a name="l00176"></a>00176 }<a name="l00177"></a>00177 <a name="l00178"></a>00178 <span class="keyword">template</span> <<span class="keyword">class</span> BASE><a name="l00179"></a><a class="code" href="class_c_f_b___cipher_template.html#df14a759fd95fd687f4e257264771f89">00179</a> <span class="keywordtype">void</span> <a class="code" href="class_c_f_b___cipher_template.html#df14a759fd95fd687f4e257264771f89">CFB_CipherTemplate<BASE>::ProcessData</a>(byte *outString, <span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length)<a name="l00180"></a>00180 {<a name="l00181"></a>00181 assert(length % this->MandatoryBlockSize() == 0);<a name="l00182"></a>00182 <a name="l00183"></a>00183 <a class="code" href="class_c_f_b___cipher_template.html#9e72e3524dd351fd0e87382fe84cd306">PolicyInterface</a> &policy = this->AccessPolicy();<a name="l00184"></a>00184 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bytesPerIteration = policy.GetBytesPerIteration();<a name="l00185"></a>00185 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> alignment = policy.GetAlignment();<a name="l00186"></a>00186 byte *reg = policy.GetRegisterBegin();<a name="l00187"></a>00187 <a name="l00188"></a>00188 <span class="keywordflow">if</span> (<a class="code" href="class_c_f_b___cipher_template.html#1360b5b5f16118705792176b1847027a">m_leftOver</a>)<a name="l00189"></a>00189 {<a name="l00190"></a>00190 <span class="keywordtype">size_t</span> len = STDMIN(<a class="code" href="class_c_f_b___cipher_template.html#1360b5b5f16118705792176b1847027a">m_leftOver</a>, length);<a name="l00191"></a>00191 CombineMessageAndShiftRegister(outString, reg + bytesPerIteration - <a class="code" href="class_c_f_b___cipher_template.html#1360b5b5f16118705792176b1847027a">m_leftOver</a>, inString, len);<a name="l00192"></a>00192 <a class="code" href="class_c_f_b___cipher_template.html#1360b5b5f16118705792176b1847027a">m_leftOver</a> -= len;<a name="l00193"></a>00193 length -= len;<a name="l00194"></a>00194 inString += len;<a name="l00195"></a>00195 outString += len;<a name="l00196"></a>00196 }<a name="l00197"></a>00197 <a name="l00198"></a>00198 <span class="keywordflow">if</span> (!length)<a name="l00199"></a>00199 <span class="keywordflow">return</span>;<a name="l00200"></a>00200 <a name="l00201"></a>00201 assert(<a class="code" href="class_c_f_b___cipher_template.html#1360b5b5f16118705792176b1847027a">m_leftOver</a> == 0);<a name="l00202"></a>00202 <a name="l00203"></a>00203 <span class="keywordflow">if</span> (policy.CanIterate() && length >= bytesPerIteration && IsAlignedOn(outString, alignment))<a name="l00204"></a>00204 {<a name="l00205"></a>00205 <span class="keywordflow">if</span> (IsAlignedOn(inString, alignment))<a name="l00206"></a>00206 policy.Iterate(outString, inString, GetCipherDir(*<span class="keyword">this</span>), length / bytesPerIteration);<a name="l00207"></a>00207 <span class="keywordflow">else</span><a name="l00208"></a>00208 {<a name="l00209"></a>00209 memcpy(outString, inString, length);<a name="l00210"></a>00210 policy.Iterate(outString, outString, GetCipherDir(*<span class="keyword">this</span>), length / bytesPerIteration);<a name="l00211"></a>00211 }<a name="l00212"></a>00212 inString += length - length % bytesPerIteration;<a name="l00213"></a>00213 outString += length - length % bytesPerIteration;<a name="l00214"></a>00214 length %= bytesPerIteration;<a name="l00215"></a>00215 }<a name="l00216"></a>00216 <a name="l00217"></a>00217 <span class="keywordflow">while</span> (length >= bytesPerIteration)<a name="l00218"></a>00218 {<a name="l00219"></a>00219 policy.TransformRegister();<a name="l00220"></a>00220 CombineMessageAndShiftRegister(outString, reg, inString, bytesPerIteration);<a name="l00221"></a>00221 length -= bytesPerIteration;<a name="l00222"></a>00222 inString += bytesPerIteration;<a name="l00223"></a>00223 outString += bytesPerIteration;<a name="l00224"></a>00224 }<a name="l00225"></a>00225 <a name="l00226"></a>00226 <span class="keywordflow">if</span> (length > 0)<a name="l00227"></a>00227 {<a name="l00228"></a>00228 policy.TransformRegister();<a name="l00229"></a>00229 CombineMessageAndShiftRegister(outString, reg, inString, length);<a name="l00230"></a>00230 <a class="code" href="class_c_f_b___cipher_template.html#1360b5b5f16118705792176b1847027a">m_leftOver</a> = bytesPerIteration - length;<a name="l00231"></a>00231 }<a name="l00232"></a>00232 }<a name="l00233"></a>00233 <a name="l00234"></a>00234 <span class="keyword">template</span> <<span class="keyword">class</span> BASE><a name="l00235"></a>00235 <span class="keywordtype">void</span> <a class="code" href="class_c_f_b___encryption_template.html">CFB_EncryptionTemplate<BASE>::CombineMessageAndShiftRegister</a>(byte *output, byte *reg, <span class="keyword">const</span> byte *message, <span class="keywordtype">size_t</span> length)<a name="l00236"></a>00236 {<a name="l00237"></a>00237 xorbuf(reg, message, length);<a name="l00238"></a>00238 memcpy(output, reg, length);<a name="l00239"></a>00239 }<a name="l00240"></a>00240 <a name="l00241"></a>00241 <span class="keyword">template</span> <<span class="keyword">class</span> BASE><a name="l00242"></a>00242 <span class="keywordtype">void</span> <a class="code" href="class_c_f_b___decryption_template.html">CFB_DecryptionTemplate<BASE>::CombineMessageAndShiftRegister</a>(byte *output, byte *reg, <span class="keyword">const</span> byte *message, <span class="keywordtype">size_t</span> length)<a name="l00243"></a>00243 {<a name="l00244"></a>00244 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<length; i++)<a name="l00245"></a>00245 {<a name="l00246"></a>00246 byte b = message[i];<a name="l00247"></a>00247 output[i] = reg[i] ^ b;<a name="l00248"></a>00248 reg[i] = b;<a name="l00249"></a>00249 }<a name="l00250"></a>00250 }<a name="l00251"></a>00251 <a name="l00252"></a>00252 NAMESPACE_END<a name="l00253"></a>00253 <a name="l00254"></a>00254 <span class="preprocessor">#endif</span><a name="l00255"></a>00255 <span class="preprocessor"></span><a name="l00256"></a>00256 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:25 2007 for Crypto++ by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address></body></html>⌨️ 快捷键说明
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