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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Crypto++: modes.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul></div><h1>modes.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// modes.cpp - written and placed in the public domain by Wei Dai</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="preprocessor">#include "pch.h"</span><a name="l00004"></a>00004 <a name="l00005"></a>00005 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span><a name="l00006"></a>00006 <span class="preprocessor"></span><a name="l00007"></a>00007 <span class="preprocessor">#include "<a class="code" href="modes_8h.html">modes.h</a>"</span><a name="l00008"></a>00008 <a name="l00009"></a>00009 <span class="preprocessor">#ifndef NDEBUG</span><a name="l00010"></a>00010 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="des_8h.html">des.h</a>"</span><a name="l00011"></a>00011 <span class="preprocessor">#endif</span><a name="l00012"></a>00012 <span class="preprocessor"></span><a name="l00013"></a>00013 NAMESPACE_BEGIN(CryptoPP)<a name="l00014"></a>00014 <a name="l00015"></a>00015 <span class="preprocessor">#ifndef NDEBUG</span><a name="l00016"></a>00016 <span class="preprocessor"></span><span class="keywordtype">void</span> Modes_TestInstantiations()<a name="l00017"></a>00017 {<a name="l00018"></a>00018 <a class="code" href="struct_c_f_b___mode.html" title="CFB mode.">CFB_Mode<DES>::Encryption</a> m0;<a name="l00019"></a>00019 <a class="code" href="struct_c_f_b___mode.html" title="CFB mode.">CFB_Mode<DES>::Decryption</a> m1;<a name="l00020"></a>00020 <a class="code" href="struct_o_f_b___mode.html" title="OFB mode.">OFB_Mode<DES>::Encryption</a> m2;<a name="l00021"></a>00021 <a class="code" href="struct_c_t_r___mode.html" title="CTR mode.">CTR_Mode<DES>::Encryption</a> m3;<a name="l00022"></a>00022 <a class="code" href="struct_e_c_b___mode.html" title="ECB mode.">ECB_Mode<DES>::Encryption</a> m4;<a name="l00023"></a>00023 <a class="code" href="struct_c_b_c___mode.html" title="CBC mode.">CBC_Mode<DES>::Encryption</a> m5;<a name="l00024"></a>00024 }<a name="l00025"></a>00025 <span class="preprocessor">#endif</span><a name="l00026"></a>00026 <span class="preprocessor"></span><a name="l00027"></a>00027 <span class="keywordtype">void</span> CTR_ModePolicy::SeekToIteration(lword iterationCount)<a name="l00028"></a>00028 {<a name="l00029"></a>00029 <span class="keywordtype">int</span> carry=0;<a name="l00030"></a>00030 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=<a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>()-1; i>=0; i--)<a name="l00031"></a>00031 {<a name="l00032"></a>00032 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sum = <a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>[i] + byte(iterationCount) + carry;<a name="l00033"></a>00033 m_counterArray[i] = (byte) sum;<a name="l00034"></a>00034 carry = sum >> 8;<a name="l00035"></a>00035 iterationCount >>= 8;<a name="l00036"></a>00036 }<a name="l00037"></a>00037 }<a name="l00038"></a>00038 <a name="l00039"></a>00039 <span class="keyword">inline</span> <span class="keywordtype">void</span> CTR_ModePolicy::ProcessMultipleBlocks(byte *output, <span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> n)<a name="l00040"></a>00040 {<a name="l00041"></a>00041 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> s = <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>(), j = 0;<a name="l00042"></a>00042 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=1; i<n; i++, j+=s)<a name="l00043"></a>00043 IncrementCounterByOne(m_counterArray + j + s, m_counterArray + j, s);<a name="l00044"></a>00044 <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-><a class="code" href="class_block_transformation.html#9efa0ea24795a19d15c9aa0d7f134562" title="encrypt or decrypt multiple blocks, for bit-slicing implementations">ProcessAndXorMultipleBlocks</a>(m_counterArray, input, output, n);<a name="l00045"></a>00045 IncrementCounterByOne(m_counterArray, m_counterArray + s*(n-1), s);<a name="l00046"></a>00046 }<a name="l00047"></a>00047 <a name="l00048"></a>00048 <span class="keywordtype">void</span> CTR_ModePolicy::OperateKeystream(<a class="code" href="strciphr_8h.html#b4a226527d2bd01ff19bfa14d0974227">KeystreamOperation</a> operation, byte *output, <span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> iterationCount)<a name="l00049"></a>00049 {<a name="l00050"></a>00050 assert(<a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-><a class="code" href="class_block_transformation.html#924da616b7ba966704fb67e2b852fd2e" title="returns true if this is an encryption object">IsForwardTransformation</a>()); <span class="comment">// CTR mode needs the "encrypt" direction of the underlying block cipher, even to decrypt</span><a name="l00051"></a>00051 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> maxBlocks = <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-><a class="code" href="class_block_transformation.html#9ee1da34a4c957d4be87d2b0469806b0" title="return number of blocks that can be processed in parallel, for bit-slicing implementations...">OptimalNumberOfParallelBlocks</a>();<a name="l00052"></a>00052 <span class="keywordflow">if</span> (maxBlocks == 1)<a name="l00053"></a>00053 {<a name="l00054"></a>00054 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sizeIncrement = <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();<a name="l00055"></a>00055 <span class="keywordflow">while</span> (iterationCount)<a name="l00056"></a>00056 {<a name="l00057"></a>00057 <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-><a class="code" href="class_block_transformation.html#1904cf145e4c5c650dd7aff32f54e153" title="encrypt or decrypt inBlock, xor with xorBlock, and write to outBlock">ProcessAndXorBlock</a>(m_counterArray, input, output);<a name="l00058"></a>00058 IncrementCounterByOne(m_counterArray, sizeIncrement);<a name="l00059"></a>00059 output += sizeIncrement;<a name="l00060"></a>00060 input += sizeIncrement;<a name="l00061"></a>00061 iterationCount -= 1;<a name="l00062"></a>00062 }<a name="l00063"></a>00063 }<a name="l00064"></a>00064 <span class="keywordflow">else</span><a name="l00065"></a>00065 {<a name="l00066"></a>00066 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sizeIncrement = maxBlocks * <a class="code" href="class_cipher_mode_base.html#6d0a5b8deef965aa690441541c5a7aa7">BlockSize</a>();<a name="l00067"></a>00067 <span class="keywordflow">while</span> (iterationCount >= maxBlocks)<a name="l00068"></a>00068 {<a name="l00069"></a>00069 ProcessMultipleBlocks(output, input, maxBlocks);<a name="l00070"></a>00070 output += sizeIncrement;<a name="l00071"></a>00071 input += sizeIncrement;<a name="l00072"></a>00072 iterationCount -= maxBlocks;<a name="l00073"></a>00073 }<a name="l00074"></a>00074 <span class="keywordflow">if</span> (iterationCount > 0)<a name="l00075"></a>00075 ProcessMultipleBlocks(output, input, iterationCount);<a name="l00076"></a>00076 }<a name="l00077"></a>00077 }<a name="l00078"></a>00078 <a name="l00079"></a>00079 <span class="keywordtype">void</span> CTR_ModePolicy::CipherResynchronize(byte *keystreamBuffer, <span class="keyword">const</span> byte *iv)<a name="l00080"></a>00080 {<a name="l00081"></a>00081 <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="l00082"></a>00082 <a class="code" href="modes_8h.html#0c35d7771f5bc9ace517ebdf23338b92">CopyOrZero</a>(<a class="code" href="class_cipher_mode_base.html#5d4cdcf2a0a4f5c52115fa622eebc10a">m_register</a>, iv, s);<a name="l00083"></a>00083 m_counterArray.New(s * <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-><a class="code" href="class_block_transformation.html#9ee1da34a4c957d4be87d2b0469806b0" title="return number of blocks that can be processed in parallel, for bit-slicing implementations...">OptimalNumberOfParallelBlocks</a>());<a name="l00084"></a>00084 <a class="code" href="modes_8h.html#0c35d7771f5bc9ace517ebdf23338b92">CopyOrZero</a>(m_counterArray, iv, s);<a name="l00085"></a>00085 }<a name="l00086"></a>00086 <a name="l00087"></a><a class="code" href="class_block_oriented_cipher_mode_base.html#1d095f1ee08abb9f03f0ed16a32c6b04">00087</a> <span class="keywordtype">void</span> <a class="code" href="class_block_oriented_cipher_mode_base.html#1d095f1ee08abb9f03f0ed16a32c6b04">BlockOrientedCipherModeBase::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="l00088"></a>00088 {<a name="l00089"></a>00089 <a class="code" href="class_cipher_mode_base.html#b6c63ae5b5521b462912b1bb2d766989">m_cipher</a>-><a class="code" href="class_simple_keying_interface.html#df3c29b3ef3af74788a58c7c49887fd7" title="set or reset the key of this object">SetKey</a>(key, length, params);<a name="l00090"></a>00090 <a class="code" href="class_block_oriented_cipher_mode_base.html#4e567f03f82e6108065a1316de50e1cf">ResizeBuffers</a>();<a name="l00091"></a>00091 <span class="keywordflow">if</span> (<a class="code" href="class_simple_keying_interface.html#71039112353cc70e9859ebd95037cc1a" title="returns whether this object can be resynchronized (i.e. supports initialization vectors)...">IsResynchronizable</a>())<a name="l00092"></a>00092 <a class="code" href="class_block_oriented_cipher_mode_base.html#f1afe72ca94c6e1c3889e785ae3bd770" title="resynchronize with an IV">Resynchronize</a>(<a class="code" href="class_simple_keying_interface.html#8d63825e000442603429b6f433b798f5">GetIVAndThrowIfInvalid</a>(params));<a name="l00093"></a>00093 }<a name="l00094"></a>00094 <a name="l00095"></a><a class="code" href="class_block_oriented_cipher_mode_base.html#947329920de17742397a7c0fd01d3364">00095</a> <span class="keywordtype">void</span> <a class="code" href="class_block_oriented_cipher_mode_base.html#947329920de17742397a7c0fd01d3364" title="encrypt or decrypt an array of bytes of specified length">BlockOrientedCipherModeBase::ProcessData</a>(byte *outString, <span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length)<a name="l00096"></a>00096 {<a name="l00097"></a>00097 <span class="keywordflow">if</span> (!length)⌨️ 快捷键说明
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