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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="l00098"></a>00098                 <span class="keywordflow">return</span>;
<a name="l00099"></a>00099 
<a name="l00100"></a>00100         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> s = <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();
<a name="l00101"></a>00101         assert(length % s == 0);
<a name="l00102"></a>00102 
<a name="l00103"></a>00103         <span class="keywordflow">if</span> (!<a class="code" href="class_block_oriented_cipher_mode_base.html#e4b779c42aaf33255f70c5723c0f40aa">RequireAlignedInput</a>() || IsAlignedOn(inString, <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-&gt;<a class="code" href="class_block_transformation.html#f2da7e22f6b6ddda72bc7db2aceaa67a" title="block pointers must be divisible by this">BlockAlignment</a>()))
<a name="l00104"></a>00104                 ProcessBlocks(outString, inString, length / s);
<a name="l00105"></a>00105         <span class="keywordflow">else</span>
<a name="l00106"></a>00106         {
<a name="l00107"></a>00107                 <span class="keywordflow">do</span>
<a name="l00108"></a>00108                 {
<a name="l00109"></a>00109                         memcpy(<a class="code" href="class_block_oriented_cipher_mode_base.html#4c6c74ef76c66ac97ec7f3409dde8f28">m_buffer</a>, inString, s);
<a name="l00110"></a>00110                         ProcessBlocks(outString, <a class="code" href="class_block_oriented_cipher_mode_base.html#4c6c74ef76c66ac97ec7f3409dde8f28">m_buffer</a>, 1);
<a name="l00111"></a>00111                         inString += s;
<a name="l00112"></a>00112                         outString += s;
<a name="l00113"></a>00113                         length -= s;
<a name="l00114"></a>00114                 } <span class="keywordflow">while</span> (length &gt; 0);
<a name="l00115"></a>00115         }
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117 
<a name="l00118"></a><a class="code" href="class_c_b_c___encryption.html#ab62151b203e74ba2d7b824ee113380c">00118</a> <span class="keywordtype">void</span> <a class="code" href="class_c_b_c___encryption.html#ab62151b203e74ba2d7b824ee113380c">CBC_Encryption::ProcessBlocks</a>(byte *outString, <span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> numberOfBlocks)
<a name="l00119"></a>00119 {
<a name="l00120"></a>00120         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blockSize = <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();
<a name="l00121"></a>00121         xorbuf(<a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, inString, blockSize);
<a name="l00122"></a>00122         <span class="keywordflow">while</span> (--numberOfBlocks)
<a name="l00123"></a>00123         {
<a name="l00124"></a>00124                 <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-&gt;<a class="code" href="class_block_transformation.html#2fefb3f4c6c6297c0c91fcbba9e4f4f3" title="encrypt or decrypt one block">ProcessBlock</a>(<a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, outString);
<a name="l00125"></a>00125                 inString += blockSize;
<a name="l00126"></a>00126                 xorbuf(m_register, inString, outString, blockSize);
<a name="l00127"></a>00127                 outString += blockSize;
<a name="l00128"></a>00128         }
<a name="l00129"></a>00129         <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-&gt;<a class="code" href="class_block_transformation.html#2fefb3f4c6c6297c0c91fcbba9e4f4f3" title="encrypt or decrypt one block">ProcessBlock</a>(<a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>);
<a name="l00130"></a>00130         memcpy(outString, <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, blockSize);
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 
<a name="l00133"></a><a class="code" href="class_c_b_c___c_t_s___encryption.html#fa5e227b89c39bff1386df7cebaa5f32">00133</a> <span class="keywordtype">void</span> <a class="code" href="class_c_b_c___c_t_s___encryption.html#fa5e227b89c39bff1386df7cebaa5f32" title="for ciphers where the last block of data is special, encrypt or decrypt the last...">CBC_CTS_Encryption::ProcessLastBlock</a>(byte *outString, <span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length)
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135         <span class="keywordflow">if</span> (length &lt;= <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>())
<a name="l00136"></a>00136         {
<a name="l00137"></a>00137                 <span class="keywordflow">if</span> (!<a class="code" href="class_c_b_c___c_t_s___encryption.html#1e5e3194957afd90092b1f49257374d3">m_stolenIV</a>)
<a name="l00138"></a>00138                         <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html" title="exception thrown when an invalid argument is detected">InvalidArgument</a>(<span class="stringliteral">"CBC_Encryption: message is too short for ciphertext stealing"</span>);
<a name="l00139"></a>00139 
<a name="l00140"></a>00140                 <span class="comment">// steal from IV</span>
<a name="l00141"></a>00141                 memcpy(outString, <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, length);
<a name="l00142"></a>00142                 outString = <a class="code" href="class_c_b_c___c_t_s___encryption.html#1e5e3194957afd90092b1f49257374d3">m_stolenIV</a>;
<a name="l00143"></a>00143         }
<a name="l00144"></a>00144         <span class="keywordflow">else</span>
<a name="l00145"></a>00145         {
<a name="l00146"></a>00146                 <span class="comment">// steal from next to last block</span>
<a name="l00147"></a>00147                 xorbuf(<a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, inString, <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>());
<a name="l00148"></a>00148                 <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-&gt;<a class="code" href="class_block_transformation.html#2fefb3f4c6c6297c0c91fcbba9e4f4f3" title="encrypt or decrypt one block">ProcessBlock</a>(<a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>);
<a name="l00149"></a>00149                 inString += <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();
<a name="l00150"></a>00150                 length -= <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();
<a name="l00151"></a>00151                 memcpy(outString+<a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>(), <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, length);
<a name="l00152"></a>00152         }
<a name="l00153"></a>00153 
<a name="l00154"></a>00154         <span class="comment">// output last full ciphertext block</span>
<a name="l00155"></a>00155         xorbuf(<a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, inString, length);
<a name="l00156"></a>00156         <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-&gt;<a class="code" href="class_block_transformation.html#2fefb3f4c6c6297c0c91fcbba9e4f4f3" title="encrypt or decrypt one block">ProcessBlock</a>(<a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>);
<a name="l00157"></a>00157         memcpy(outString, <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>());
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 
<a name="l00160"></a><a class="code" href="class_c_b_c___decryption.html#2c7f5922787ad06b2d9e348527c761d5">00160</a> <span class="keywordtype">void</span> <a class="code" href="class_c_b_c___decryption.html#2c7f5922787ad06b2d9e348527c761d5">CBC_Decryption::ProcessBlocks</a>(byte *outString, <span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> numberOfBlocks)
<a name="l00161"></a>00161 {
<a name="l00162"></a>00162         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blockSize = <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();
<a name="l00163"></a>00163         <span class="keywordflow">do</span>
<a name="l00164"></a>00164         {
<a name="l00165"></a>00165                 memcpy(<a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>, inString, blockSize);    <span class="comment">// make copy in case we're doing in place decryption</span>
<a name="l00166"></a>00166                 <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-&gt;<a class="code" href="class_block_transformation.html#1904cf145e4c5c650dd7aff32f54e153" title="encrypt or decrypt inBlock, xor with xorBlock, and write to outBlock">ProcessAndXorBlock</a>(<a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>, <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, outString);
<a name="l00167"></a>00167                 <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>.<a class="code" href="class_sec_block.html#3872f50f03372fa859803971961f02cd" title="swap contents and size with another SecBlock">swap</a>(<a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>);
<a name="l00168"></a>00168                 inString += blockSize;
<a name="l00169"></a>00169                 outString += blockSize;
<a name="l00170"></a>00170         } <span class="keywordflow">while</span> (--numberOfBlocks);
<a name="l00171"></a>00171 }
<a name="l00172"></a>00172 
<a name="l00173"></a><a class="code" href="class_c_b_c___c_t_s___decryption.html#2f23aad280dc56920f16ea0711b39d89">00173</a> <span class="keywordtype">void</span> <a class="code" href="class_c_b_c___c_t_s___decryption.html#2f23aad280dc56920f16ea0711b39d89" title="for ciphers where the last block of data is special, encrypt or decrypt the last...">CBC_CTS_Decryption::ProcessLastBlock</a>(byte *outString, <span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length)
<a name="l00174"></a>00174 {
<a name="l00175"></a>00175         <span class="keyword">const</span> byte *pn, *pn1;
<a name="l00176"></a>00176         <span class="keywordtype">bool</span> stealIV = length &lt;= <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();
<a name="l00177"></a>00177 
<a name="l00178"></a>00178         <span class="keywordflow">if</span> (stealIV)
<a name="l00179"></a>00179         {
<a name="l00180"></a>00180                 pn = inString;
<a name="l00181"></a>00181                 pn1 = <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>;
<a name="l00182"></a>00182         }
<a name="l00183"></a>00183         <span class="keywordflow">else</span>
<a name="l00184"></a>00184         {
<a name="l00185"></a>00185                 pn = inString + <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();
<a name="l00186"></a>00186                 pn1 = inString;
<a name="l00187"></a>00187                 length -= <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();
<a name="l00188"></a>00188         }
<a name="l00189"></a>00189 
<a name="l00190"></a>00190         <span class="comment">// decrypt last partial plaintext block</span>
<a name="l00191"></a>00191         memcpy(<a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>, pn1, <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>());
<a name="l00192"></a>00192         <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-&gt;<a class="code" href="class_block_transformation.html#2fefb3f4c6c6297c0c91fcbba9e4f4f3" title="encrypt or decrypt one block">ProcessBlock</a>(<a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>);
<a name="l00193"></a>00193         xorbuf(<a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>, pn, length);
<a name="l00194"></a>00194 
<a name="l00195"></a>00195         <span class="keywordflow">if</span> (stealIV)
<a name="l00196"></a>00196                 memcpy(outString, <a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>, length);
<a name="l00197"></a>00197         <span class="keywordflow">else</span>
<a name="l00198"></a>00198         {
<a name="l00199"></a>00199                 memcpy(outString+<a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>(), <a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>, length);
<a name="l00200"></a>00200                 <span class="comment">// decrypt next to last plaintext block</span>
<a name="l00201"></a>00201                 memcpy(<a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>, pn, length);
<a name="l00202"></a>00202                 <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-&gt;<a class="code" href="class_block_transformation.html#2fefb3f4c6c6297c0c91fcbba9e4f4f3" title="encrypt or decrypt one block">ProcessBlock</a>(<a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>);
<a name="l00203"></a>00203                 xorbuf(outString, <a class="code" href="class_c_b_c___decryption.html#e26eb3eb2b8fed3c1ffad582a37a48da">m_temp</a>, <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>());
<a name="l00204"></a>00204         }
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 
<a name="l00207"></a>00207 NAMESPACE_END
<a name="l00208"></a>00208 
<a name="l00209"></a>00209 <span class="preprocessor">#endif</span>
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