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/******************************************************************************
* swcipher.cpp - code for class 'SWCipher'- a driver class that provides
* cipher utilities.
*/
#include <string.h>
#include <stdlib.h>
#include <swcipher.h>
/******************************************************************************
* SWCipher Constructor - Initializes data for instance of SWCipher
*
*/
SWCipher::SWCipher(unsigned char *key) {
master.initialize(key, strlen((char *)key));
buf = 0;
}
/******************************************************************************
* SWCipher Destructor - Cleans up instance of SWCipher
*/
SWCipher::~SWCipher()
{
if (buf)
free(buf);
}
char *SWCipher::Buf(const char *ibuf, unsigned int ilen)
{
if (ibuf) {
if (buf)
free(buf);
if (!ilen) {
len = strlen(buf);
ilen = len + 1;
}
else len = ilen;
buf = (char *) malloc(ilen);
memcpy(buf, ibuf, ilen);
cipher = false;
}
Decode();
return buf;
}
char *SWCipher::cipherBuf(unsigned int *ilen, const char *ibuf)
{
if (ibuf) {
if (buf)
free(buf);
buf = (char *) malloc(*ilen);
memcpy(buf, ibuf, *ilen);
len = *ilen;
cipher = true;
}
Encode();
*ilen = (short)len;
return buf;
}
/******************************************************************************
* SWCipher::Encode - This function "encodes" the input stream into the
* output stream.
* The GetChars() and SendChars() functions are
* used to separate this method from the actual
* i/o.
*/
void SWCipher::Encode(void)
{
if (!cipher) {
work = master;
for (int i = 0; i < len; i++)
buf[i] = work.encrypt(buf[i]);
cipher = true;
}
}
/******************************************************************************
* SWCipher::Decode - This function "decodes" the input stream into the
* output stream.
* The GetChars() and SendChars() functions are
* used to separate this method from the actual
* i/o.
*/
void SWCipher::Decode(void)
{
if (cipher) {
work = master;
for (int i = 0; i < len; i++)
buf[i] = work.decrypt(buf[i]);
cipher = false;
}
}
/******************************************************************************
* SWCipher::setCipherKey - setter for a new CipherKey
*
*/
void SWCipher::setCipherKey(const char *ikey) {
unsigned char *key = (unsigned char *)ikey;
master.initialize(key, strlen((char *)key));
}
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