SWCipher Class Reference

#include <swcipher.h>

Collaboration diagram for SWCipher:

Public Member Functions
virtual void	decode (void)
virtual void	encode (void)
virtual char *	getCipheredBuf (unsigned long *len=0)
virtual char *	getUncipheredBuf ()
virtual void	setCipheredBuf (unsigned long *len, const char *buf=0)
virtual void	setCipherKey (const char *key)
virtual void	setUncipheredBuf (const char *buf=0, unsigned long len=0)
	SWCipher (unsigned char *key)
virtual	~SWCipher ()

Static Public Member Functions
static SWBuf	personalize (const SWBuf &buf, bool encode)

Private Attributes
char *	buf
bool	cipher
unsigned long	len
Sapphire	master
Sapphire	work

Detailed Description

Definition at line 33 of file swcipher.h.

Constructor & Destructor Documentation

SWORD_NAMESPACE_START SWCipher::SWCipher

(

unsigned char *

key

)

Definition at line 49 of file swcipher.cpp.

                                     {
    SWBuf cipherKey = personalize((const char *)key, false);
    master.initialize((unsigned char *)(const char *)cipherKey, cipherKey.size());
    buf = 0;
}

SWCipher::~SWCipher ( )

virtual

Definition at line 60 of file swcipher.cpp.

{
    if (buf)
        free(buf);
}

Member Function Documentation

void SWCipher::decode ( void  )

virtual

Definition at line 149 of file swcipher.cpp.

{
    if (cipher) {
        work = master;
        unsigned long i;
        for (i = 0; i < len; i++)
            buf[i] = work.decrypt(buf[i]);
        buf[i] = 0;
        cipher = false;
    }
}

void SWCipher::encode ( void  )

virtual

Definition at line 130 of file swcipher.cpp.

{
    if (!cipher) {
        work = master;
        for (unsigned long i = 0; i < len; i++)
            buf[i] = work.encrypt(buf[i]);
        cipher = true;
    }
}

char * SWCipher::getCipheredBuf ( unsigned long *  len = 0 )

virtual

Definition at line 112 of file swcipher.cpp.

                                                  {

    encode();

    if (ilen) *ilen = len;

    return buf;
}

char * SWCipher::getUncipheredBuf ( )

virtual

Definition at line 87 of file swcipher.cpp.

                                 {

    decode();

    return buf;
}

SWBuf SWCipher::personalize ( const SWBuf &  buf, bool  encode  )

static

Definition at line 179 of file swcipher.cpp.

                                                         {

    std::map<char, int> charHash;
    for (int i = 0; i < 62; ++i) charHash[lats[i]] = i;

    SWBuf segs[5];
    int segn = 0;
    for (unsigned int i = 0; i < buf.size() && segn < 5; ++i) {
        if (buf[i] == '-') ++segn;
        else segs[segn].append(buf[i]);
    }
    SWBuf result;
    SWBuf chkSum = segs[4];
    if (segs[4].size() < 5) segs[4].size(4);
    for (int i = 0; i < 4; ++i) {
        int csum = 0;
        for (unsigned int j = 0; j < segs[i].size() && j < segs[0].size(); ++j) {
            char hash = charHash[segs[i][j]];
            char obfusHash = charHash[segs[0][j%segs[0].size()]];
            if (encode) {
                obfusHash = hash - (i ? obfusHash : 0);
                if (obfusHash < 0) obfusHash = (62 + obfusHash);
            }
            else {
                obfusHash = hash + (i ? obfusHash : 0);
                obfusHash %= 62;
            }
            if (i) segs[i][j] = lats[(long)obfusHash];
            csum += (encode ? obfusHash : hash);
        }
        segs[4][i] = lats[csum%62];
        if (result.size()) result += "-";
        result += (!encode && !i ? "" : segs[i].c_str());
    }
    if (encode) {
        result += "-";
        result += segs[4];
    }
    return (!encode && chkSum != segs[4]) ? buf : result;
}

void SWCipher::setCipheredBuf ( unsigned long *  len, const char *  buf = 0  )

virtual

Definition at line 95 of file swcipher.cpp.

                                                                   {
    if (ibuf) {
    
        if (buf)
            free(buf);
            
        buf = (char *) malloc(*ilen+1);
        memcpy(buf, ibuf, *ilen);
        len = *ilen;
        cipher = true;
    }

    encode();

    *ilen = len;
}

void SWCipher::setCipherKey ( const char *  key )

virtual

Definition at line 167 of file swcipher.cpp.

                                            {
    SWBuf cipherKey = personalize(ikey, false);
    master.initialize((unsigned char *)(const char *)cipherKey, cipherKey.size());
}

void SWCipher::setUncipheredBuf ( const char *  buf = 0, unsigned long  len = 0  )

virtual

Definition at line 67 of file swcipher.cpp.

                                                                    {
    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();
}

Member Data Documentation

char* SWCipher::buf

private

Definition at line 39 of file swcipher.h.

bool SWCipher::cipher

private

Definition at line 40 of file swcipher.h.

unsigned long SWCipher::len

private

Definition at line 41 of file swcipher.h.

Sapphire SWCipher::master

private

Definition at line 36 of file swcipher.h.

Sapphire SWCipher::work

private

Definition at line 37 of file swcipher.h.

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The documentation for this class was generated from the following files:

• include/swcipher.h
• src/modules/common/swcipher.cpp