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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 165 行
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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++: pkcspad.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>pkcspad.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// pkcspad.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">#include "pkcspad.h"</span>00006 <span class="preprocessor">#include <assert.h></span>00007 00008 NAMESPACE_BEGIN(CryptoPP)00009 00010 <span class="keyword">template</span><> <span class="keyword">const</span> byte PKCS_DigestDecoration<MD2>::decoration[] = {0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x02,0x05,0x00,0x04,0x10};00011 <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PKCS_DigestDecoration<MD2>::length = <span class="keyword">sizeof</span>(PKCS_DigestDecoration<MD2>::decoration);00012 00013 <span class="keyword">template</span><> <span class="keyword">const</span> byte PKCS_DigestDecoration<MD5>::decoration[] = {0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0x04,0x10};00014 <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PKCS_DigestDecoration<MD5>::length = <span class="keyword">sizeof</span>(PKCS_DigestDecoration<MD5>::decoration);00015 00016 <span class="keyword">template</span><> <span class="keyword">const</span> byte PKCS_DigestDecoration<RIPEMD160>::decoration[] = {0x30,0x21,0x30,0x09,0x06,0x05,0x2b,0x24,0x03,0x02,0x01,0x05,0x00,0x04,0x14};00017 <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PKCS_DigestDecoration<RIPEMD160>::length = <span class="keyword">sizeof</span>(PKCS_DigestDecoration<RIPEMD160>::decoration);00018 00019 <span class="keyword">template</span><> <span class="keyword">const</span> byte PKCS_DigestDecoration<SHA256>::decoration[] = {0x30,0x31,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x01,0x05,0x00,0x04,0x20};00020 <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PKCS_DigestDecoration<SHA256>::length = <span class="keyword">sizeof</span>(PKCS_DigestDecoration<SHA256>::decoration);00021 00022 <span class="keyword">template</span><> <span class="keyword">const</span> byte PKCS_DigestDecoration<SHA384>::decoration[] = {0x30,0x41,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x02,0x05,0x00,0x04,0x30};00023 <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PKCS_DigestDecoration<SHA384>::length = <span class="keyword">sizeof</span>(PKCS_DigestDecoration<SHA384>::decoration);00024 00025 <span class="keyword">template</span><> <span class="keyword">const</span> byte PKCS_DigestDecoration<SHA512>::decoration[] = {0x30,0x51,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x03,0x05,0x00,0x04,0x40};00026 <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PKCS_DigestDecoration<SHA512>::length = <span class="keyword">sizeof</span>(PKCS_DigestDecoration<SHA512>::decoration);00027 00028 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PKCS_EncryptionPaddingScheme::MaxUnpaddedLength(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> paddedLength)<span class="keyword"> const</span>00029 <span class="keyword"></span>{00030 <span class="keywordflow">return</span> paddedLength/8 > 10 ? paddedLength/8-10 : 0;00031 }00032 00033 <span class="keywordtype">void</span> PKCS_EncryptionPaddingScheme::Pad(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, <span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> inputLen, byte *pkcsBlock, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> pkcsBlockLen)<span class="keyword"> const</span>00034 <span class="keyword"></span>{00035 assert (inputLen <= MaxUnpaddedLength(pkcsBlockLen)); <span class="comment">// this should be checked by caller</span>00036 00037 <span class="comment">// convert from bit length to byte length</span>00038 <span class="keywordflow">if</span> (pkcsBlockLen % 8 != 0)00039 {00040 pkcsBlock[0] = 0;00041 pkcsBlock++;00042 }00043 pkcsBlockLen /= 8;00044 00045 pkcsBlock[0] = 2; <span class="comment">// block type 2</span>00046 00047 <span class="comment">// pad with non-zero random bytes</span>00048 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 1; i < pkcsBlockLen-inputLen-1; i++)00049 pkcsBlock[i] = (byte)rng.<a class="code" href="class_random_number_generator.html#_x917_r_n_ga3">GenerateWord32</a>(1, 0xff);00050 00051 pkcsBlock[pkcsBlockLen-inputLen-1] = 0; <span class="comment">// separator</span>00052 memcpy(pkcsBlock+pkcsBlockLen-inputLen, input, inputLen);00053 }00054 00055 <a class="code" href="struct_decoding_result.html">DecodingResult</a> PKCS_EncryptionPaddingScheme::Unpad(<span class="keyword">const</span> byte *pkcsBlock, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> pkcsBlockLen, byte *output)<span class="keyword"> const</span>00056 <span class="keyword"></span>{00057 <span class="keywordtype">bool</span> invalid = <span class="keyword">false</span>;00058 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> maxOutputLen = MaxUnpaddedLength(pkcsBlockLen);00059 00060 <span class="comment">// convert from bit length to byte length</span>00061 <span class="keywordflow">if</span> (pkcsBlockLen % 8 != 0)00062 {00063 invalid = (pkcsBlock[0] != 0) || invalid;00064 pkcsBlock++;00065 }00066 pkcsBlockLen /= 8;00067 00068 <span class="comment">// Require block type 2.</span>00069 invalid = (pkcsBlock[0] != 2) || invalid;00070 00071 <span class="comment">// skip past the padding until we find the seperator</span>00072 <span class="keywordtype">unsigned</span> i=1;00073 <span class="keywordflow">while</span> (i<pkcsBlockLen && pkcsBlock[i++]) { <span class="comment">// null body</span>00074 }00075 assert(i==pkcsBlockLen || pkcsBlock[i-1]==0);00076 00077 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> outputLen = pkcsBlockLen - i;00078 invalid = (outputLen > maxOutputLen) || invalid;00079 00080 <span class="keywordflow">if</span> (invalid)00081 <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>();00082 00083 memcpy (output, pkcsBlock+i, outputLen);00084 <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>(outputLen);00085 }00086 00087 <span class="comment">// ********************************************************</span>00088 00089 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span>00090 <span class="preprocessor"></span>00091 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PKCS_SignaturePaddingScheme::MaxUnpaddedLength(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> paddedLength)<span class="keyword"> const</span>00092 <span class="keyword"></span>{00093 <span class="keywordflow">return</span> paddedLength/8 > 10 ? paddedLength/8-10 : 0;00094 }00095 00096 <span class="keywordtype">void</span> PKCS_SignaturePaddingScheme::Pad(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &, <span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> inputLen, byte *pkcsBlock, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> pkcsBlockLen)<span class="keyword"> const</span>00097 <span class="keyword"></span>{00098 assert (inputLen <= MaxUnpaddedLength(pkcsBlockLen)); <span class="comment">// this should be checked by caller</span>00099 00100 <span class="comment">// convert from bit length to byte length</span>00101 <span class="keywordflow">if</span> (pkcsBlockLen % 8 != 0)00102 {00103 pkcsBlock[0] = 0;00104 pkcsBlock++;00105 }00106 pkcsBlockLen /= 8;00107 00108 pkcsBlock[0] = 1; <span class="comment">// block type 1</span>00109 00110 <span class="comment">// padd with 0xff</span>00111 memset(pkcsBlock+1, 0xff, pkcsBlockLen-inputLen-2);00112 00113 pkcsBlock[pkcsBlockLen-inputLen-1] = 0; <span class="comment">// separator</span>00114 memcpy(pkcsBlock+pkcsBlockLen-inputLen, input, inputLen);00115 }00116 00117 <a class="code" href="struct_decoding_result.html">DecodingResult</a> PKCS_SignaturePaddingScheme::Unpad(<span class="keyword">const</span> byte *pkcsBlock, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> pkcsBlockLen, byte *output)<span class="keyword"> const</span>00118 <span class="keyword"></span>{00119 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> maxOutputLen = MaxUnpaddedLength(pkcsBlockLen);00120 00121 <span class="comment">// convert from bit length to byte length</span>00122 <span class="keywordflow">if</span> (pkcsBlockLen % 8 != 0)00123 {00124 <span class="keywordflow">if</span> (pkcsBlock[0] != 0)00125 <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>();00126 pkcsBlock++;00127 }00128 pkcsBlockLen /= 8;00129 00130 <span class="comment">// Require block type 1.</span>00131 <span class="keywordflow">if</span> (pkcsBlock[0] != 1)00132 <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>();00133 00134 <span class="comment">// skip past the padding until we find the seperator</span>00135 <span class="keywordtype">unsigned</span> i=1;00136 <span class="keywordflow">while</span> (i<pkcsBlockLen && pkcsBlock[i++])00137 <span class="keywordflow">if</span> (pkcsBlock[i-1] != 0xff) <span class="comment">// not valid padding</span>00138 <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>();00139 assert(i==pkcsBlockLen || pkcsBlock[i-1]==0);00140 00141 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> outputLen = pkcsBlockLen - i;00142 <span class="keywordflow">if</span> (outputLen > maxOutputLen)00143 <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>();00144 00145 memcpy (output, pkcsBlock+i, outputLen);00146 <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>(outputLen);00147 }00148 00149 <span class="preprocessor">#endif</span>00150 <span class="preprocessor"></span>00151 NAMESPACE_END</pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:21 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.2 </small></address></body></html>⌨️ 快捷键说明
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