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来自「Crypto++是一个非常强大的密码学库,主要是功能全」· HTML 代码 · 共 516 行 · 第 1/5 页

00410 <span class="preprocessor"></span>                MAX_PRIME_LENGTH = 1024, PRIME_LENGTH_MULTIPLE = 64};
00411 };
00412 <span class="comment"></span>
00413 <span class="comment">//! .</span>
00414 <span class="comment"></span><span class="keyword">template</span> &lt;<span class="keyword">class</span> MAC, <span class="keywordtype">bool</span> DHAES_MODE&gt;
<a name="l00415"></a><a class="code" href="class_d_l___encryption_algorithm___xor.html">00415</a> <span class="keyword">class </span><a class="code" href="class_d_l___encryption_algorithm___xor.html">DL_EncryptionAlgorithm_Xor</a> : <span class="keyword">public</span> <a class="code" href="class_d_l___symmetric_encryption_algorithm.html">DL_SymmetricEncryptionAlgorithm</a>
00416 {
00417 <span class="keyword">public</span>:
00418         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetSymmetricKeyLength(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> plainTextLength)<span class="keyword"> const</span>
00419 <span class="keyword">                </span>{<span class="keywordflow">return</span> plainTextLength + MAC::DEFAULT_KEYLENGTH;}
00420         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetSymmetricCiphertextLength(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> plainTextLength)<span class="keyword"> const</span>
00421 <span class="keyword">                </span>{<span class="keywordflow">return</span> plainTextLength + MAC::DIGESTSIZE;}
00422         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetMaxSymmetricPlaintextLength(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> cipherTextLength)<span class="keyword"> const</span>
00423 <span class="keyword">                </span>{<span class="keywordflow">return</span> SaturatingSubtract(cipherTextLength, (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)MAC::DIGESTSIZE);}
00424         <span class="keywordtype">void</span> SymmetricEncrypt(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &amp;rng, <span class="keyword">const</span> byte *key, <span class="keyword">const</span> byte *plainText, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> plainTextLength, byte *cipherText)<span class="keyword"> const</span>
00425 <span class="keyword">        </span>{
00426                 <span class="keyword">const</span> byte *cipherKey, *macKey;
00427                 <span class="keywordflow">if</span> (DHAES_MODE)
00428                 {
00429                         macKey = key;
00430                         cipherKey = key + MAC::DEFAULT_KEYLENGTH;
00431                 }
00432                 <span class="keywordflow">else</span>
00433                 {
00434                         cipherKey = key;
00435                         macKey = key + plainTextLength;
00436                 }
00437 
00438                 xorbuf(cipherText, plainText, cipherKey, plainTextLength);
00439                 MAC(macKey).CalculateDigest(cipherText + plainTextLength, cipherText, plainTextLength);
00440         }
00441         <a class="code" href="struct_decoding_result.html">DecodingResult</a> SymmetricDecrypt(<span class="keyword">const</span> byte *key, <span class="keyword">const</span> byte *cipherText, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> cipherTextLength, byte *plainText)<span class="keyword"> const</span>
00442 <span class="keyword">        </span>{
00443                 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> plainTextLength = GetMaxSymmetricPlaintextLength(cipherTextLength);
00444                 <span class="keyword">const</span> byte *cipherKey, *macKey;
00445                 <span class="keywordflow">if</span> (DHAES_MODE)
00446                 {
00447                         macKey = key;
00448                         cipherKey = key + MAC::DEFAULT_KEYLENGTH;
00449                 }
00450                 <span class="keywordflow">else</span>
00451                 {
00452                         cipherKey = key;
00453                         macKey = key + plainTextLength;
00454                 }
00455 
00456                 <span class="keywordflow">if</span> (!MAC(macKey).VerifyDigest(cipherText + plainTextLength, cipherText, plainTextLength))
00457                         <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>();
00458                 xorbuf(plainText, cipherText, cipherKey, plainTextLength);
00459                 <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>(plainTextLength);
00460         }
00461 };
00462 <span class="comment"></span>
00463 <span class="comment">//! .</span>
00464 <span class="comment"></span><span class="keyword">template</span> &lt;<span class="keyword">class</span> T, <span class="keywordtype">bool</span> DHAES_MODE, <span class="keyword">class</span> KDF&gt;
<a name="l00465"></a><a class="code" href="class_d_l___key_derivation_algorithm___p1363.html">00465</a> <span class="keyword">class </span><a class="code" href="class_d_l___key_derivation_algorithm___p1363.html">DL_KeyDerivationAlgorithm_P1363</a> : <span class="keyword">public</span> <a class="code" href="class_d_l___key_derivation_algorithm.html">DL_KeyDerivationAlgorithm</a>&lt;T&gt;
00466 {
00467 <span class="keyword">public</span>:
00468         <span class="keywordtype">void</span> Derive(<span class="keyword">const</span> <a class="code" href="class_d_l___group_parameters.html">DL_GroupParameters&lt;T&gt;</a> &amp;params, byte *derivedKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> derivedLength, <span class="keyword">const</span> T &amp;agreedElement, <span class="keyword">const</span> T &amp;ephemeralPublicKey)<span class="keyword"> const</span>
00469 <span class="keyword">        </span>{
00470                 <a class="code" href="class_sec_block.html">SecByteBlock</a> agreedSecret;
00471                 <span class="keywordflow">if</span> (DHAES_MODE)
00472                 {
00473                         agreedSecret.<a class="code" href="class_sec_block.html#_sec_block_with_hinta19">New</a>(params.<a class="code" href="class_d_l___group_parameters.html#_d_l___group_parametersa18">GetEncodedElementSize</a>(<span class="keyword">true</span>) + params.<a class="code" href="class_d_l___group_parameters.html#_d_l___group_parametersa18">GetEncodedElementSize</a>(<span class="keyword">false</span>));
00474                         params.<a class="code" href="class_d_l___group_parameters.html#_d_l___group_parametersa19">EncodeElement</a>(<span class="keyword">true</span>, ephemeralPublicKey, agreedSecret);
00475                         params.<a class="code" href="class_d_l___group_parameters.html#_d_l___group_parametersa19">EncodeElement</a>(<span class="keyword">false</span>, agreedElement, agreedSecret + params.<a class="code" href="class_d_l___group_parameters.html#_d_l___group_parametersa18">GetEncodedElementSize</a>(<span class="keyword">true</span>));
00476                 }
00477                 <span class="keywordflow">else</span>
00478                 {
00479                         agreedSecret.<a class="code" href="class_sec_block.html#_sec_block_with_hinta19">New</a>(params.<a class="code" href="class_d_l___group_parameters.html#_d_l___group_parametersa18">GetEncodedElementSize</a>(<span class="keyword">false</span>));
00480                         params.<a class="code" href="class_d_l___group_parameters.html#_d_l___group_parametersa19">EncodeElement</a>(<span class="keyword">false</span>, agreedElement, agreedSecret);
00481                 }
00482 
00483                 KDF::DeriveKey(derivedKey, derivedLength, agreedSecret, agreedSecret.<a class="code" href="class_sec_block.html#_sec_block_with_hinta13">size</a>());
00484         }
00485 };
00486 <span class="comment"></span>
00487 <span class="comment">//! Discrete Log Integrated Encryption Scheme, AKA &lt;a href="http://www.weidai.com/scan-mirror/ca.html#DLIES"&gt;DLIES&lt;/a&gt;</span>
00488 <span class="comment"></span><span class="keyword">template</span> &lt;<span class="keyword">class</span> COFACTOR_OPTION = NoCofactorMultiplication, <span class="keywordtype">bool</span> DHAES_MODE = true&gt;
<a name="l00489"></a><a class="code" href="struct_d_l_i_e_s.html">00489</a> <span class="keyword">struct </span><a class="code" href="struct_d_l_i_e_s.html">DLIES</a>
00490         : <span class="keyword">public</span> <a class="code" href="class_d_l___e_s.html">DL_ES</a>&lt;
00491                 DL_CryptoKeys_GFP,
00492                 DL_KeyAgreementAlgorithm_DH&lt;Integer, COFACTOR_OPTION&gt;,
00493                 DL_KeyDerivationAlgorithm_P1363&lt;Integer, DHAES_MODE, P1363_KDF2&lt;SHA1&gt; &gt;,
00494                 DL_EncryptionAlgorithm_Xor&lt;HMAC&lt;SHA1&gt;, DHAES_MODE&gt;,
00495                 DLIES&lt;&gt; &gt;
00496 {
00497         <span class="keyword">static</span> std::string StaticAlgorithmName() {<span class="keywordflow">return</span> <span class="stringliteral">"DLIES"</span>;}      <span class="comment">// TODO: fix this after name is standardized</span>
00498 };
00499 
00500 NAMESPACE_END
00501 
00502 <span class="preprocessor">#endif</span>
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