You could pass in a reference to a string for the output, then use
out.c_str() after calling it, or if you want to avoid strings altogether, you
can convert without Crypto++.
void crypt::hexDec(string data, string &out)
{
// Your code, except don't declare "string out".
}
or:
NOTE: this function assumes a null terminated pHex string, and assumes an even
number of hex characters
int hex2bin(const char *pHex, unsigned char *pBin, int nMaxBinBytes)
{
bool bIsHexChar;
bool bIsUpper = true;
unsigned char nTemp;
unsigned char nOut;
int nNumBinBytes = 0;
while (*pHex && nNumBinBytes < nMaxBinBytes)
{
bIsHexChar = true;
if ( *pHex >= '0' && *pHex <= '9') nTemp = *pHex - 48;
else if (*pHex >= 'A' && *pHex <= 'F') nTemp = *pHex - 55;
else if (*pHex >= 'a' && *pHex <= 'f') nTemp = *pHex - 87;
else bIsHexChar = false;
++pHex;
if (bIsHexChar)
{
if (bIsUpper)
{
nOut = (nTemp << 4) & 0xF0;
bIsUpper = false;
}
else
{
nOut = (nOut | (nTemp & 0x0F));
*pBin++ = nOut;
++nNumBinBytes;
bIsUpper = true;
}
}
}
return(nNumBinBytes);
}
>________________________________
> From: Michael <[email protected]>
>To: Crypto++ Users <[email protected]>
>Sent: Thursday, March 29, 2012 11:49 AM
>Subject: Hex To Byte?
>
>this is currently my hex decoder
>
>string crypt::hexDec(string data)
>{
> engine.pl("crypt-> generating plaintext from hex",1);
>
> //create cipher
> CryptoPP::HexDecoder decoder;
>
> //create and write data to buffer
> string out;
> decoder.Attach(new CryptoPP::StringSink(out));
> decoder.Put((byte*)engine.str2ch(data), data.length());
> decoder.MessageEnd();
>
> //return buffer
> return out;
>}
>
>but the problem is now i need one to return as a char array, and
>because im dealing with binary files and such, cant exactly be
>converting from string and back.
>
>Whats the correct way to just convert it to and return a char array
>
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>
>
>
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