I don't think the code in the wiki really answers your question... In crypto++, block ciphers and stream ciphers both use the SymmetricCipher interface, so using them is really similar. I'd observe that I generally see no joy in using a stream cipher in most circumstances. It seems to me much easier to misuse than AES, and my applications don't see enough performance gain to justify that.
I've attached a test program that works with salsa20, panama, aes128cbc and aes256cbc, generates keys and IVs, encrypts a string and decrypts the resulting ciphertext. I'm not sure that randomly generating an IV is always safe for salsa... you may need to additionally ensure that you've never used that IV with that key before. Just the same, this should give you a feel for the interface. This was built with gcc 4.0.1 on Mac OS X 10.4.9, but there's nothing here that shouldn't work on Linux or Windows. If anyone wants to post this code to the wiki, go ahead. This is public domain. Regards, Geoff On 6/12/07, Jeffrey Walton <[EMAIL PROTECTED]> wrote: > > http://www.cryptopp.com/wiki/Symmetric_Cipher > > On 6/12/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > > > Hi everybody, > > > > I'm having trouble using stream ciphers in Crypto++ 5.5.1. > > > > The FAQ says that the easiest way to use a stream cipher is to use > > ARC4, but ARC4 is in the Weak namespace and has vulnerabilities, so I > > don't want to use it. I'd like to use Panama or Salsa20, but my C++ > > knowledge is limited and I can't figure out how to use it from reading > > the source code. I know there are modes for standard block ciphers to > > make them like stream ciphers, but I'm trying to stick with a pure > > stream cipher for now. I've traced the test program to find the > > ObjectFactoryRegistry but it seems like a lot of code for one object. > > > > Are there any tutorials/examples on how to use the 'recommended' > > stream ciphers? Do I need to use the object factories used in the > > test programs? Also, is it time to update the FAQ (http:// > > www.cryptopp.com/fom-serve/cache/30.html) since its last update was > > nearly seven years ago and still seems to recommend the use of ARC4? > > > > My apologies if I missed some documentation or something really > > obvious. > > > > Thanks > > > > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the "Crypto++ Users" Google Group. To unsubscribe, send an email to [EMAIL PROTECTED] More information about Crypto++ and this group is available at http://www.cryptopp.com. -~----------~----~----~----~------~----~------~--~---
symmtest.cc
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