On Sun, Nov 5, 2023 at 4:38 AM Lucas Marchetti <lmarchetti...@gmail.com> wrote:
> Sorry, seeing now that I've linked the wrong Golang library, here it is: > https://pkg.go.dev/golang.org/x/crypto/chacha20poly1305 > > On Sunday, November 5, 2023 at 10:10:44 AM UTC+1 Lucas Marchetti wrote: > >> I've just made a test encrypting the string "Hello World!" with both >> client and server functions and these are the results. >> >> [image: Screenshot 2023-11-05 100312.png] >> >> Both green-highlighted bytes corresponds to the input string but, as you >> can see, there is a different padding that I'm 100% sure is the source of >> the problem. >> >> On Saturday, November 4, 2023 at 7:39:31 PM UTC+1 Lucas Marchetti wrote: >> >>> Good evening. >>> >>> I'm building a client-server application and I want to implement a >>> XChaCha20 communication over TCP after performing key exchange. >>> >>> What I'm issuing is a bad decryption output like the one shown in the >>> pic. >>> >>> [image: Screenshot 2023-11-04 193625.png] >>> >>> I'm currently using crypto++ 8.9 in the client-side and >>> https://pkg.go.dev/golang.org/x/crypto/chacha20 in the server-side. >>> >>> Is that something related to sealing or authentication implemented in >>> the Golang library? >>> >>> Functions that I'm using: >>> >>> [image: Screenshot 2023-11-04 193751.png] >>> >>> [image: Screenshot 2023-11-04 193832.png] >>> >>> Thanks in advance. >>> >> If you want help, then you should provide source code and post a link to a minimal reproducer. Pictures are not helpful. The wiki is full of little working examples. For example, < https://www.cryptopp.com/wiki/XChaCha20> and < https://www.cryptopp.com/wiki/XChaCha20Poly1305>. You should also probably start with test vectors, and then move onto arbitrary messages once things work with test vectors. Here are the ones Crypto++ uses for XChaCha: < https://github.com/weidai11/cryptopp/blob/master/TestVectors/chacha.txt>. And here are the ones for ChaCha20/Poly1305: < https://github.com/weidai11/cryptopp/blob/master/TestVectors/chacha20poly1305.txt#L4669 >. I'm just guessing, but the 16-bytes of garbage at the end of the [encrypted] message may be a Poly1305 authentication tag. But it is just a guess. The go documentation should tell you what you have. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8nsoQPBtdeHhtMTRw%3DB8mFBpCj2QkcrEQbSJMuLRZw98w%40mail.gmail.com.
