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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Crypto++: modes.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.2 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Compound List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Compound Members</a> | <a class="qindex" href="globals.html">File Members</a></div><h1>modes.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// modes.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="modes_8h.html">modes.h</a>"</span>00008 00009 <span class="preprocessor">#ifndef NDEBUG</span>00010 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="des_8h.html">des.h</a>"</span>00011 <span class="preprocessor">#endif</span>00012 <span class="preprocessor"></span>00013 NAMESPACE_BEGIN(CryptoPP)00014 00015 #ifndef NDEBUG00016 <span class="keywordtype">void</span> Modes_TestInstantiations()00017 {00018 <a class="code" href="struct_c_f_b___mode.html">CFB_Mode<DES></a>::Encryption m0;00019 <a class="code" href="struct_c_f_b___mode.html">CFB_Mode<DES></a>::Decryption m1;00020 <a class="code" href="struct_o_f_b___mode.html">OFB_Mode<DES></a>::Encryption m2;00021 <a class="code" href="struct_c_t_r___mode.html">CTR_Mode<DES></a>::Encryption m3;00022 <a class="code" href="struct_e_c_b___mode.html">ECB_Mode<DES></a>::Encryption m4;00023 <a class="code" href="struct_c_b_c___mode.html">CBC_Mode<DES></a>::Encryption m5;00024 }00025 <span class="preprocessor">#endif</span>00026 <span class="preprocessor"></span>00027 <span class="keywordtype">void</span> CipherModeBase::SetKey(<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">NameValuePairs</a> &params)00028 {00029 UncheckedSetKey(params, key, length); <span class="comment">// the underlying cipher will check the key length</span>00030 }00031 00032 <span class="keywordtype">void</span> CipherModeBase::GetNextIV(byte *IV)00033 {00034 <span class="keywordflow">if</span> (!<a class="code" href="class_stream_transformation.html#_symmetric_ciphera14">IsForwardTransformation</a>())00035 <span class="keywordflow">throw</span> <a class="code" href="class_not_implemented.html">NotImplemented</a>(<span class="stringliteral">"CipherModeBase: GetNextIV() must be called on an encryption object"</span>);00036 00037 m_cipher->ProcessBlock(m_register);00038 memcpy(IV, m_register, <a class="code" href="namespace_name.html#a9">BlockSize</a>());00039 }00040 00041 <span class="keywordtype">void</span> CipherModeBase::SetIV(<span class="keyword">const</span> byte *iv)00042 {00043 <span class="keywordflow">if</span> (iv)00044 <a class="code" href="class_simple_keying_interface.html#_x_m_a_c_ca33">Resynchronize</a>(iv);00045 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="class_simple_keying_interface.html#_x_m_a_c_c___basea30">IsResynchronizable</a>())00046 {00047 <span class="keywordflow">if</span> (!<a class="code" href="class_simple_keying_interface.html#_x_m_a_c_c___basea33">CanUseStructuredIVs</a>())00048 <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html">InvalidArgument</a>(<span class="stringliteral">"CipherModeBase: this cipher mode cannot use a null IV"</span>);00049 00050 <span class="comment">// use all zeros as default IV</span>00051 <a class="code" href="class_sec_block.html">SecByteBlock</a> iv(<a class="code" href="namespace_name.html#a9">BlockSize</a>());00052 memset(iv, 0, iv.<a class="code" href="class_sec_block.html#_sec_block_with_hinta13">size</a>());00053 <a class="code" href="class_simple_keying_interface.html#_x_m_a_c_ca33">Resynchronize</a>(iv);00054 }00055 }00056 00057 <span class="keywordtype">void</span> CTR_ModePolicy::GetNextIV(byte *IV)00058 {00059 IncrementCounterByOne(IV, m_counterArray, <a class="code" href="namespace_name.html#a9">BlockSize</a>());00060 }00061 00062 <span class="keywordtype">void</span> CTR_ModePolicy::SeekToIteration(dword iterationCount)00063 {00064 <span class="keywordtype">int</span> carry=0;00065 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=<a class="code" href="namespace_name.html#a9">BlockSize</a>()-1; i>=0 && (iterationCount || carry); i--)00066 {00067 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sum = m_counterArray[i] + byte(iterationCount) + carry;00068 m_counterArray[i] = (byte) sum;00069 carry = sum >> 8;00070 iterationCount >>= 8;00071 }00072 }00073 00074 <span class="keywordtype">void</span> CTR_ModePolicy::OperateKeystream(KeystreamOperation operation, byte *output, <span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iterationCount)00075 {00076 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> maxBlocks = m_cipher->OptimalNumberOfParallelBlocks();00077 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sizeIncrement = maxBlocks * m_cipher->BlockSize();00078 <span class="keywordflow">while</span> (iterationCount >= maxBlocks)00079 {00080 ProcessMultipleBlocks(output, input, maxBlocks);00081 output += sizeIncrement;00082 input += sizeIncrement;00083 iterationCount -= maxBlocks;00084 }00085 <span class="keywordflow">if</span> (iterationCount > 0)00086 ProcessMultipleBlocks(output, input, iterationCount);00087 }00088 <span class="keywordtype">void</span> CTR_ModePolicy::CipherResynchronize(byte *keystreamBuffer, <span class="keyword">const</span> byte *iv)00089 {00090 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> s = <a class="code" href="namespace_name.html#a9">BlockSize</a>();00091 memcpy(m_register, iv, s);00092 m_counterArray.New(s * m_cipher->OptimalNumberOfParallelBlocks());00093 memcpy(m_counterArray, iv, s);00094 }00095 00096 <span class="keywordtype">void</span> BlockOrientedCipherModeBase::UncheckedSetKey(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &params, <span class="keyword">const</span> byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length)00097 {00098 m_cipher->SetKey(key, length, params);00099 ResizeBuffers();00100 <span class="keyword">const</span> byte *iv = params.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha40">GetValueWithDefault</a>(Name::IV(), (<span class="keyword">const</span> byte *)NULL);00101 SetIV(iv);00102 }00103 00104 <span class="keywordtype">void</span> BlockOrientedCipherModeBase::ProcessData(byte *outString, <span class="keyword">const</span> byte *inString, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length)00105 {00106 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> s = <a class="code" href="namespace_name.html#a9">BlockSize</a>();00107 assert(length % s == 0);00108 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> alignment = m_cipher->BlockAlignment();00109 <span class="keywordtype">bool</span> requireAlignedInput = RequireAlignedInput();00110 00111 <span class="keywordflow">if</span> (IsAlignedOn(outString, alignment))00112 {00113 <span class="keywordflow">if</span> (!requireAlignedInput || IsAlignedOn(inString, alignment))00114 ProcessBlocks(outString, inString, length / s);⌨️ 快捷键说明
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