encryption

Hi All,
 I am looking to encrypt some text and store it in a file. I am also looking to decrypt n retrive the text, using a eky.
Is anybodsy aware of some source code that could achive such a functionality.
Appreciate the help.
Thanks,
Preetham.
preetham_mpAsked:
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GaryFxCommented:
On UNIX, you can use the standard crypt function.  It's weak, but may be enough for your purposes.  If you need something that meets current standards, then the Crypto++ library (the first link in Axter's answer) is the place to start for source or portable code.  If you're only interested in Microsoft Windows, then MS has a Crypto API with strong encryption.

Gary
preetham_mpAuthor Commented:
What i am looking at is some implementation of a RC4 "type" encryption algorithm..one
which does not require to get a license to use.
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AxterCommented:
What OS?
What compiler?

What type of application(MFC, Win32-App, Win32-Console)?

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akcomCommented:
//function used for en/decrypting text
void crypttext(char *szText, char *szKey, unsigned int iTextSize, unsigned int iKeySize)
{
   for (int i = 0;i < iTextSize;i++)
   {
      szText[i] ^= szKey[i % iKeySize];
    }
}

int main()
{  
   char cMessage[] = "this is my text, about to be encrypted";
   char cKey[] = "this is my key";
   
   crypttext(cMessage, cKey, sizeof(cMessage), sizeof(cKey));
   //text is now encrypted, just write it to a file
   
   crypttext(cMessage, cKey, sizeof(cMessage), sizeof(cKey));
   //text is now decrypted again
}
GaryFxCommented:
OpenSSL has an RC4 clone, and OpenSSL has no license fees (though some of its algorithms are patented in the US and cannot legally be used in the US without a patent owner).  I'm not sure what the current status of RC4 is, but there are other algorithms that serve the same purpose.  Crypto++ has a number of those.

Gary
tinchosCommented:
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Split: Axter {http:#9251418} & GaryFx {http:#9259258}

Please leave any comments here within the next seven days.
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