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<hr><h1>swcipher.cpp</h1><div class="fragment"><pre>00001 <font class="comment">/******************************************************************************</font>
00002 <font class="comment"> * swcipher.cpp - code for class 'SWCipher'- a driver class that provides</font>
00003 <font class="comment"> * cipher utilities.</font>
00004 <font class="comment"> */</font>
00005
00006 <font class="preprocessor">#include <string.h></font>
00007 <font class="preprocessor">#include <stdlib.h></font>
00008 <font class="preprocessor">#include <swcipher.h></font>
00009
00010
00011 <font class="comment">/******************************************************************************</font>
00012 <font class="comment"> * SWCipher Constructor - Initializes data for instance of SWCipher</font>
00013 <font class="comment"> *</font>
00014 <font class="comment"> */</font>
00015
00016 SWCipher::SWCipher(<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> *key) {
00017 master.initialize(key, strlen((<font class="keywordtype">char</font> *)key));
00018 buf = 0;
00019 }
00020
00021
00022 <font class="comment">/******************************************************************************</font>
00023 <font class="comment"> * SWCipher Destructor - Cleans up instance of SWCipher</font>
00024 <font class="comment"> */</font>
00025
00026 SWCipher::~SWCipher()
00027 {
00028 <font class="keywordflow">if</font> (buf)
00029 free(buf);
00030 }
00031
00032
00033 <font class="keywordtype">char</font> *SWCipher::Buf(<font class="keyword">const</font> <font class="keywordtype">char</font> *ibuf, <font class="keywordtype">unsigned</font> <font class="keywordtype">int</font> ilen)
00034 {
00035 <font class="keywordflow">if</font> (ibuf) {
00036
00037 <font class="keywordflow">if</font> (buf)
00038 free(buf);
00039
00040 <font class="keywordflow">if</font> (!ilen) {
00041 len = strlen(buf);
00042 ilen = len + 1;
00043 }
00044 <font class="keywordflow">else</font> len = ilen;
00045
00046 buf = (<font class="keywordtype">char</font> *) malloc(ilen);
00047 memcpy(buf, ibuf, ilen);
00048 cipher = <font class="keyword">false</font>;
00049 }
00050
00051 Decode();
00052
00053 <font class="keywordflow">return</font> buf;
00054 }
00055
00056
00057 <font class="keywordtype">char</font> *SWCipher::cipherBuf(<font class="keywordtype">unsigned</font> <font class="keywordtype">int</font> *ilen, <font class="keyword">const</font> <font class="keywordtype">char</font> *ibuf)
00058 {
00059 <font class="keywordflow">if</font> (ibuf) {
00060
00061 <font class="keywordflow">if</font> (buf)
00062 free(buf);
00063
00064 buf = (<font class="keywordtype">char</font> *) malloc(*ilen);
00065 memcpy(buf, ibuf, *ilen);
00066 len = *ilen;
00067 cipher = <font class="keyword">true</font>;
00068 }
00069
00070 Encode();
00071
00072 *ilen = (short)len;
00073 <font class="keywordflow">return</font> buf;
00074 }
00075
00076
00077 <font class="comment">/******************************************************************************</font>
00078 <font class="comment"> * SWCipher::Encode - This function "encodes" the input stream into the</font>
00079 <font class="comment"> * output stream.</font>
00080 <font class="comment"> * The GetChars() and SendChars() functions are</font>
00081 <font class="comment"> * used to separate this method from the actual</font>
00082 <font class="comment"> * i/o.</font>
00083 <font class="comment"> */</font>
00084
00085 <font class="keywordtype">void</font> SWCipher::Encode(<font class="keywordtype">void</font>)
00086 {
00087 <font class="keywordflow">if</font> (!cipher) {
00088 work = master;
00089 <font class="keywordflow">for</font> (<font class="keywordtype">int</font> i = 0; i < len; i++)
00090 buf[i] = work.encrypt(buf[i]);
00091 cipher = <font class="keyword">true</font>;
00092 }
00093 }
00094
00095
00096 <font class="comment">/******************************************************************************</font>
00097 <font class="comment"> * SWCipher::Decode - This function "decodes" the input stream into the</font>
00098 <font class="comment"> * output stream.</font>
00099 <font class="comment"> * The GetChars() and SendChars() functions are</font>
00100 <font class="comment"> * used to separate this method from the actual</font>
00101 <font class="comment"> * i/o.</font>
00102 <font class="comment"> */</font>
00103
00104 <font class="keywordtype">void</font> SWCipher::Decode(<font class="keywordtype">void</font>)
00105 {
00106 <font class="keywordflow">if</font> (cipher) {
00107 work = master;
00108 <font class="keywordflow">for</font> (<font class="keywordtype">int</font> i = 0; i < len; i++)
00109 buf[i] = work.decrypt(buf[i]);
00110 cipher = <font class="keyword">false</font>;
00111 }
00112 }
00113
00114
00115 <font class="comment">/******************************************************************************</font>
00116 <font class="comment"> * SWCipher::setCipherKey - setter for a new CipherKey</font>
00117 <font class="comment"> *</font>
00118 <font class="comment"> */</font>
00119
00120 <font class="keywordtype">void</font> SWCipher::setCipherKey(<font class="keyword">const</font> <font class="keywordtype">char</font> *ikey) {
00121 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> *key = (<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> *)ikey;
00122 master.initialize(key, strlen((<font class="keywordtype">char</font> *)key));
00123 }
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