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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++: pkcspad.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>pkcspad.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// pkcspad.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_PKCSPAD_CPP // SunCC workaround: compiler could cause this file to be included twice</span><a name="l00006"></a>00006 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_PKCSPAD_CPP</span><a name="l00007"></a>00007 <span class="preprocessor"></span><a name="l00008"></a>00008 <span class="preprocessor">#include "pkcspad.h"</span><a name="l00009"></a>00009 <span class="preprocessor">#include <assert.h></span><a name="l00010"></a>00010 <a name="l00011"></a>00011 NAMESPACE_BEGIN(CryptoPP)<a name="l00012"></a>00012 <a name="l00013"></a>00013 <span class="comment">// more in dll.cpp</span><a name="l00014"></a><a class="code" href="class_p_k_c_s___digest_decoration.html#fadda60882f465a603ed7554e4e5efd8">00014</a> template<> const byte <a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration</a><Weak1::MD2>::decoration[] = {0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x02,0x05,0x00,0x04,0x10};<a name="l00015"></a><a class="code" href="class_p_k_c_s___digest_decoration.html#f133b1d4081e41367ee1cc39cf73a50d">00015</a> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<Weak1::MD2>::length</a> = <span class="keyword">sizeof</span>(<a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<Weak1::MD2>::decoration</a>);<a name="l00016"></a>00016 <a name="l00017"></a><a class="code" href="class_p_k_c_s___digest_decoration.html#2b32dcf2ce245b3858c03a27b6d39097">00017</a> <span class="keyword">template</span><> <span class="keyword">const</span> byte <a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<Weak1::MD5>::decoration</a>[] = {0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0x04,0x10};<a name="l00018"></a><a class="code" href="class_p_k_c_s___digest_decoration.html#ff2faf984009621f87773a8719a6b857">00018</a> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<Weak1::MD5>::length</a> = <span class="keyword">sizeof</span>(<a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<Weak1::MD5>::decoration</a>);<a name="l00019"></a>00019 <a name="l00020"></a><a class="code" href="class_p_k_c_s___digest_decoration.html#7ee80cecbb0fdbdd7a8c7cf99ca18b37">00020</a> <span class="keyword">template</span><> <span class="keyword">const</span> byte <a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<RIPEMD160>::decoration</a>[] = {0x30,0x21,0x30,0x09,0x06,0x05,0x2b,0x24,0x03,0x02,0x01,0x05,0x00,0x04,0x14};<a name="l00021"></a><a class="code" href="class_p_k_c_s___digest_decoration.html#b84560fdc5eeaf7fb6411b2cafbb9d9e">00021</a> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<RIPEMD160>::length</a> = <span class="keyword">sizeof</span>(<a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<RIPEMD160>::decoration</a>);<a name="l00022"></a>00022 <a name="l00023"></a><a class="code" href="class_p_k_c_s___digest_decoration.html#e7c51da773053d46e405ad7b4e6b648c">00023</a> <span class="keyword">template</span><> <span class="keyword">const</span> byte <a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<Tiger>::decoration</a>[] = {0x30,0x29,0x30,0x0D,0x06,0x09,0x2B,0x06,0x01,0x04,0x01,0xDA,0x47,0x0C,0x02,0x05,0x00,0x04,0x18};<a name="l00024"></a><a class="code" href="class_p_k_c_s___digest_decoration.html#8e46361c950d9a4b06f59f9ad4cb72fc">00024</a> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<Tiger>::length</a> = <span class="keyword">sizeof</span>(<a class="code" href="class_p_k_c_s___digest_decoration.html">PKCS_DigestDecoration<Tiger>::decoration</a>);<a name="l00025"></a>00025 <a name="l00026"></a><a class="code" href="class_p_k_c_s___encryption_padding_scheme.html#9a747d8f4b5b30b2569e8f717a544d8d">00026</a> <span class="keywordtype">size_t</span> <a class="code" href="class_p_k_c_s___encryption_padding_scheme.html#9a747d8f4b5b30b2569e8f717a544d8d" title="max size of unpadded message in bytes, given max size of padded message in bits (1...">PKCS_EncryptionPaddingScheme::MaxUnpaddedLength</a>(<span class="keywordtype">size_t</span> paddedLength)<span class="keyword"> const</span><a name="l00027"></a>00027 <span class="keyword"></span>{<a name="l00028"></a>00028 <span class="keywordflow">return</span> SaturatingSubtract(paddedLength/8, 10U);<a name="l00029"></a>00029 }<a name="l00030"></a>00030 <a name="l00031"></a><a class="code" href="class_p_k_c_s___encryption_padding_scheme.html#743048874d3ebb12f47045bcdb13c716">00031</a> <span class="keywordtype">void</span> <a class="code" href="class_p_k_c_s___encryption_padding_scheme.html#743048874d3ebb12f47045bcdb13c716">PKCS_EncryptionPaddingScheme::Pad</a>(<a class="code" href="class_random_number_generator.html" title="interface for random number generators">RandomNumberGenerator</a> &rng, <span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> inputLen, byte *pkcsBlock, <span class="keywordtype">size_t</span> pkcsBlockLen, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &parameters)<span class="keyword"> const</span><a name="l00032"></a>00032 <span class="keyword"></span>{<a name="l00033"></a>00033 assert (inputLen <= <a class="code" href="class_p_k_c_s___encryption_padding_scheme.html#9a747d8f4b5b30b2569e8f717a544d8d" title="max size of unpadded message in bytes, given max size of padded message in bits (1...">MaxUnpaddedLength</a>(pkcsBlockLen)); <span class="comment">// this should be checked by caller</span><a name="l00034"></a>00034 <a name="l00035"></a>00035 <span class="comment">// convert from bit length to byte length</span><a name="l00036"></a>00036 <span class="keywordflow">if</span> (pkcsBlockLen % 8 != 0)<a name="l00037"></a>00037 {<a name="l00038"></a>00038 pkcsBlock[0] = 0;<a name="l00039"></a>00039 pkcsBlock++;<a name="l00040"></a>00040 }<a name="l00041"></a>00041 pkcsBlockLen /= 8;<a name="l00042"></a>00042 <a name="l00043"></a>00043 pkcsBlock[0] = 2; <span class="comment">// block type 2</span><a name="l00044"></a>00044 <a name="l00045"></a>00045 <span class="comment">// pad with non-zero random bytes</span><a name="l00046"></a>00046 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 1; i < pkcsBlockLen-inputLen-1; i++)<a name="l00047"></a>00047 pkcsBlock[i] = (byte)rng.<a class="code" href="class_random_number_generator.html#c06c9f5e66f35d643e4192f231b8a4cd" title="generate a random 32 bit word in the range min to max, inclusive">GenerateWord32</a>(1, 0xff);<a name="l00048"></a>00048 <a name="l00049"></a>00049 pkcsBlock[pkcsBlockLen-inputLen-1] = 0; <span class="comment">// separator</span><a name="l00050"></a>00050 memcpy(pkcsBlock+pkcsBlockLen-inputLen, input, inputLen);<a name="l00051"></a>00051 }<a name="l00052"></a>00052 <a name="l00053"></a><a class="code" href="class_p_k_c_s___encryption_padding_scheme.html#e043f6b0771c31665758aae66ba4cc5f">00053</a> <a class="code" href="struct_decoding_result.html" title="used to return decoding results">DecodingResult</a> <a class="code" href="class_p_k_c_s___encryption_padding_scheme.html#e043f6b0771c31665758aae66ba4cc5f">PKCS_EncryptionPaddingScheme::Unpad</a>(<span class="keyword">const</span> byte *pkcsBlock, <span class="keywordtype">size_t</span> pkcsBlockLen, byte *output, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &parameters)<span class="keyword"> const</span><a name="l00054"></a>00054 <span class="keyword"></span>{<a name="l00055"></a>00055 <span class="keywordtype">bool</span> invalid = <span class="keyword">false</span>;⌨️ 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