Hi, I am testing the decryption with the GcmCypherBlock and I am totally stuck with the exception "mac check in GCM failed" when I call DoFinal().
* The encryption does not generate any problem, and I use the same secret symmetric key, public IV and additional text in the Aead param for both encryption and decryption. I also performed the DH exchange correctly wih the X25519 agreement to compute my symmetric key. * I use a 128 bit IV and mac and a 256 bits key size * I also tried this code sample from this web site to compare and it worked fine: https://codereview.stackexchange.com/questions/110952/bouncycastle-diffie-hellman * I event tried this code sample with the X25519 and using the same "secret message" and it still worked... So now I am a bit clueless as to what can go wrong. Thanks, Benoit
