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<h1>pubkey.cpp</h1><pre class="fragment"><div>00001 <span class="comment">// pubkey.cpp - written and placed in the public domain by Wei Dai</span>
00002 
00003 <span class="preprocessor">#include "pch.h"</span>
00004 
00005 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span>
00006 <span class="preprocessor"></span>
00007 <span class="preprocessor">#include "<a class="code" href="pubkey_8h.html">pubkey.h</a>"</span>
00008 
00009 NAMESPACE_BEGIN(CryptoPP)
00010 
00011 void P1363_MGF1KDF2_Common(<a class="code" href="class_hash_transformation.html">HashTransformation</a> &amp;hash, byte *output, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> outputLength, const byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> inputLength, const byte *derivationParams, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> derivationParamsLength, <span class="keywordtype">bool</span> mask, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> counterStart)
00012 {
00013         <a class="code" href="class_array_sink.html">ArraySink</a> *sink;
00014         <a class="code" href="class_hash_filter.html">HashFilter</a> filter(hash, sink = mask ? <span class="keyword">new</span> <a class="code" href="class_array_xor_sink.html">ArrayXorSink</a>(output, outputLength) : <span class="keyword">new</span> <a class="code" href="class_array_sink.html">ArraySink</a>(output, outputLength));
00015         word32 counter = counterStart;
00016         <span class="keywordflow">while</span> (sink-&gt;<a class="code" href="class_array_sink.html#_array_xor_sinka3">AvailableSize</a>() &gt; 0)
00017         {
00018                 filter.<a class="code" href="class_buffered_transformation.html#_zlib_decompressorz1_0">Put</a>(input, inputLength);
00019                 filter.<a class="code" href="class_buffered_transformation.html#_zlib_decompressorz1_3">PutWord32</a>(counter++);
00020                 filter.<a class="code" href="class_buffered_transformation.html#_zlib_decompressorz1_0">Put</a>(derivationParams, derivationParamsLength);
00021                 filter.<a class="code" href="class_buffered_transformation.html#_zlib_decompressorz1_7">MessageEnd</a>();
00022         }
00023 }
00024 
00025 <span class="keywordtype">bool</span> PK_DeterministicSignatureMessageEncodingMethod::VerifyMessageRepresentative(
00026         <a class="code" href="class_hash_transformation.html">HashTransformation</a> &amp;hash, HashIdentifier hashIdentifier, <span class="keywordtype">bool</span> messageEmpty,
00027         byte *representative, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> representativeBitLength)<span class="keyword"> const</span>
00028 <span class="keyword"></span>{
00029         <a class="code" href="class_sec_block.html">SecByteBlock</a> computedRepresentative(BitsToBytes(representativeBitLength));
00030         ComputeMessageRepresentative(NullRNG(), NULL, 0, hash, hashIdentifier, messageEmpty, computedRepresentative, representativeBitLength);
00031         <span class="keywordflow">return</span> memcmp(representative, computedRepresentative, computedRepresentative.<a class="code" href="class_sec_block.html#_sec_block_with_hinta15">size</a>()) == 0;
00032 }
00033 
00034 <span class="keywordtype">bool</span> PK_RecoverableSignatureMessageEncodingMethod::VerifyMessageRepresentative(
00035         <a class="code" href="class_hash_transformation.html">HashTransformation</a> &amp;hash, HashIdentifier hashIdentifier, <span class="keywordtype">bool</span> messageEmpty,
00036         byte *representative, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> representativeBitLength)<span class="keyword"> const</span>
00037 <span class="keyword"></span>{
00038         <a class="code" href="class_sec_block.html">SecByteBlock</a> recoveredMessage(MaxRecoverableLength(representativeBitLength, hashIdentifier.second, hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_c___basea8">DigestSize</a>()));
00039         <a class="code" href="struct_decoding_result.html">DecodingResult</a> result = RecoverMessageFromRepresentative(
00040                 hash, hashIdentifier, messageEmpty, representative, representativeBitLength, recoveredMessage);
00041         <span class="keywordflow">return</span> result.<a class="code" href="struct_decoding_result.html#_decoding_resulto0">isValidCoding</a> &amp;&amp; result.<a class="code" href="struct_decoding_result.html#_decoding_resulto1">messageLength</a> == 0;
00042 }
00043 
00044 <span class="keywordtype">void</span> TF_SignerBase::InputRecoverableMessage(<a class="code" href="class_p_k___message_accumulator.html">PK_MessageAccumulator</a> &amp;messageAccumulator, <span class="keyword">const</span> byte *recoverableMessage, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> recoverableMessageLength)<span class="keyword"> const</span>
00045 <span class="keyword"></span>{
00046         PK_MessageAccumulatorBase &amp;ma = static_cast&lt;PK_MessageAccumulatorBase &amp;&gt;(messageAccumulator);
00047         <span class="keyword">const</span> MessageEncodingInterface &amp;mei = GetMessageEncodingInterface();
00048         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> maxRecoverableLength = mei.MaxRecoverableLength(MessageRepresentativeBitLength(), GetHashIdentifier().second, ma.AccessHash().DigestSize());
00049 
00050         <span class="keywordflow">if</span> (maxRecoverableLength == 0)
00051                 {<span class="keywordflow">throw</span> <a class="code" href="class_not_implemented.html">NotImplemented</a>(<span class="stringliteral">"TF_SignerBase: this algorithm does not support messsage recovery or the key is too short"</span>);}
00052         <span class="keywordflow">if</span> (recoverableMessageLength &gt; maxRecoverableLength)
00053                 <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html">InvalidArgument</a>(<span class="stringliteral">"TF_SignerBase: the recoverable message part is too long for the given key and algorithm"</span>);
00054 
00055         ma.m_recoverableMessage.Assign(recoverableMessage, recoverableMessageLength);
00056         mei.ProcessRecoverableMessage(
00057                 ma.AccessHash(), 
00058                 recoverableMessage, recoverableMessageLength,
00059                 NULL, 0, ma.m_semisignature);
00060 }
00061 
<a name="l00062"></a><a class="code" href="class_t_f___signer_base.html#_two_bases_3_01_t_f___signer_base_00_01_private_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a1">00062</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_t_f___signer_base.html#_two_bases_3_01_t_f___signer_base_00_01_private_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a1">TF_SignerBase::SignAndRestart</a>(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &amp;rng, <a class="code" href="class_p_k___message_accumulator.html">PK_MessageAccumulator</a> &amp;messageAccumulator, byte *signature, <span class="keywordtype">bool</span> restart)<span class="keyword"> const</span>
00063 <span class="keyword"></span>{
00064         PK_MessageAccumulatorBase &amp;ma = static_cast&lt;PK_MessageAccumulatorBase &amp;&gt;(messageAccumulator);
00065         <a class="code" href="class_sec_block.html">SecByteBlock</a> representative(MessageRepresentativeLength());
00066         GetMessageEncodingInterface().ComputeMessageRepresentative(rng, 
00067                 ma.m_recoverableMessage, ma.m_recoverableMessage.size(), 
00068                 ma.AccessHash(), GetHashIdentifier(), ma.m_empty,
00069                 representative, MessageRepresentativeBitLength());
00070         ma.m_empty = <span class="keyword">true</span>;
00071 
00072         <a class="code" href="class_integer.html">Integer</a> r(representative, representative.<a class="code" href="class_sec_block.html#_sec_block_with_hinta15">size</a>());
00073         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> signatureLength = <a class="code" href="class_p_k___signature_scheme.html#_p_k___verifiera8">SignatureLength</a>();
00074         GetTrapdoorFunctionInterface().CalculateRandomizedInverse(rng, r).Encode(signature, signatureLength);
00075         <span class="keywordflow">return</span> signatureLength;
00076 }
00077 
<a name="l00078"></a><a class="code" href="class_t_f___verifier_base.html#_two_bases_3_01_t_f___verifier_base_00_01_public_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a0">00078</a> <span class="keywordtype">void</span> <a class="code" href="class_t_f___verifier_base.html#_two_bases_3_01_t_f___verifier_base_00_01_public_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a0">TF_VerifierBase::InputSignature</a>(<a class="code" href="class_p_k___message_accumulator.html">PK_MessageAccumulator</a> &amp;messageAccumulator, <span class="keyword">const</span> byte *signature, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> signatureLength)<span class="keyword"> const</span>
00079 <span class="keyword"></span>{
00080         PK_MessageAccumulatorBase &amp;ma = static_cast&lt;PK_MessageAccumulatorBase &amp;&gt;(messageAccumulator);
00081         ma.m_representative.New(MessageRepresentativeLength());
00082         <a class="code" href="class_integer.html">Integer</a> x = GetTrapdoorFunctionInterface().ApplyFunction(<a class="code" href="class_integer.html">Integer</a>(signature, signatureLength));
00083         <span class="keywordflow">if</span> (x.BitCount() &gt; MessageRepresentativeBitLength())
00084                 x = <a class="code" href="class_integer.html#_integerz37_12">Integer::Zero</a>();    <span class="comment">// don't return false here to prevent timing attack</span>
00085         x.Encode(ma.m_representative, ma.m_representative.size());
00086 }
00087 
<a name="l00088"></a><a class="code" href="class_t_f___verifier_base.html#_two_bases_3_01_t_f___verifier_base_00_01_public_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a1">00088</a> <span class="keywordtype">bool</span> <a class="code" href="class_t_f___verifier_base.html#_two_bases_3_01_t_f___verifier_base_00_01_public_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a1">TF_VerifierBase::VerifyAndRestart</a>(<a class="code" href="class_p_k___message_accumulator.html">PK_MessageAccumulator</a> &amp;messageAccumulator)<span class="keyword"> const</span>
00089 <span class="keyword"></span>{
00090         PK_MessageAccumulatorBase &amp;ma = static_cast&lt;PK_MessageAccumulatorBase &amp;&gt;(messageAccumulator);
00091         <span class="keywordtype">bool</span> result = GetMessageEncodingInterface().VerifyMessageRepresentative(
00092                 ma.AccessHash(), GetHashIdentifier(), ma.m_empty, ma.m_representative, MessageRepresentativeBitLength());
00093         ma.m_empty = <span class="keyword">true</span>;
00094         <span class="keywordflow">return</span> result;
00095 }
00096 
<a name="l00097"></a><a class="code" href="class_t_f___verifier_base.html#_two_bases_3_01_t_f___verifier_base_00_01_public_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a2">00097</a> <a class="code" href="struct_decoding_result.html">DecodingResult</a> <a class="code" href="class_t_f___verifier_base.html#_two_bases_3_01_t_f___verifier_base_00_01_public_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a2">TF_VerifierBase::RecoverAndRestart</a>(byte *recoveredMessage, <a class="code" href="class_p_k___message_accumulator.html">PK_MessageAccumulator</a> &amp;messageAccumulator)<span class="keyword"> const</span>
00098 <span class="keyword"></span>{
00099         PK_MessageAccumulatorBase &amp;ma = static_cast&lt;PK_MessageAccumulatorBase &amp;&gt;(messageAccumulator);
00100         <a class="code" href="struct_decoding_result.html">DecodingResult</a> result = GetMessageEncodingInterface().RecoverMessageFromRepresentative(
00101                 ma.AccessHash(), GetHashIdentifier(), ma.m_empty, ma.m_representative, MessageRepresentativeBitLength(), recoveredMessage);
00102         ma.m_empty = <span class="keyword">true</span>;
00103         <span class="keywordflow">return</span> result;
00104 }
00105 
<a name="l00106"></a><a class="code" href="class_t_f___decryptor_base.html#_two_bases_3_01_t_f___decryptor_base_00_01_private_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a0">00106</a> <a class="code" href="struct_decoding_result.html">DecodingResult</a> <a class="code" href="class_t_f___decryptor_base.html#_two_bases_3_01_t_f___decryptor_base_00_01_private_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a0">TF_DecryptorBase::Decrypt</a>(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &amp;rng, <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> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &amp;parameters)<span class="keyword"> const</span>
00107 <span class="keyword"></span>{
00108         <a class="code" href="class_sec_block.html">SecByteBlock</a> paddedBlock(PaddedBlockByteLength());
00109         <a class="code" href="class_integer.html">Integer</a> x = GetTrapdoorFunctionInterface().CalculateInverse(rng, <a class="code" href="class_integer.html">Integer</a>(ciphertext, <a class="code" href="class_p_k___crypto_system.html#_p_k___encryptora5">FixedCiphertextLength</a>()));
00110         <span class="keywordflow">if</span> (x.ByteCount() &gt; paddedBlock.<a class="code" href="class_sec_block.html#_sec_block_with_hinta15">size</a>())
00111                 x = <a class="code" href="class_integer.html#_integerz37_12">Integer::Zero</a>();    <span class="comment">// don't return false here to prevent timing attack</span>
00112         x.Encode(paddedBlock, paddedBlock.<a class="code" href="class_sec_block.html#_sec_block_with_hinta15">size</a>());
00113         <span class="keywordflow">return</span> GetMessageEncodingInterface().Unpad(paddedBlock, PaddedBlockBitLength(), plaintext, parameters);
00114 }
00115 
<a name="l00116"></a><a class="code" href="class_t_f___encryptor_base.html#_two_bases_3_01_t_f___encryptor_base_00_01_public_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a0">00116</a> <span class="keywordtype">void</span> <a class="code" href="class_t_f___encryptor_base.html#_two_bases_3_01_t_f___encryptor_base_00_01_public_key_copier_3_01_s_c_h_e_m_e___o_p_t_i_o_n_s_1_1_keys_01_4_01_4a0">TF_EncryptorBase::Encrypt</a>(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &amp;rng, <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> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &amp;parameters)<span class="keyword"> const</span>
00117 <span class="keyword"></span>{
00118         <span class="keywordflow">if</span> (plaintextLength &gt; <a class="code" href="class_p_k___crypto_system.html#_p_k___encryptora6">FixedMaxPlaintextLength</a>())
00119                 <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html">InvalidArgument</a>(<a class="code" href="class_algorithm.html#_zlib_decompressora17">AlgorithmName</a>() + <span class="stringliteral">": message too long for this public key"</span>);
00120 
00121         <a class="code" href="class_sec_block.html">SecByteBlock</a> paddedBlock(PaddedBlockByteLength());
00122         GetMessageEncodingInterface().Pad(rng, plaintext, plaintextLength, paddedBlock, PaddedBlockBitLength(), parameters);
00123         GetTrapdoorFunctionInterface().ApplyRandomizedFunction(rng, <a class="code" href="class_integer.html">Integer</a>(paddedBlock, paddedBlock.<a class="code" href="class_sec_block.html#_sec_block_with_hinta15">size</a>())).Encode(ciphertext, <a class="code" href="class_p_k___crypto_system.html#_p_k___encryptora5">FixedCiphertextLength</a>());
00124 }
00125 
00126 NAMESPACE_END
00127 
00128 <span class="preprocessor">#endif</span>
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