Howto implement chacha20-poly1305?

[Stef Bon]

2016-11-28 22:01 GMT+01:00 Stef Bon <stefbon at gmail.com>:

>> Then use gcry_cipher_gettag/gcry_cipher_checktag for retrieving/checking
>> tag.
>>
>> It is an AEAD cipher mode, so there is no separate encryption and separate
>> MAC.
>
> Ah. Thanks a lot!

Do I have to decrypt and encrypt in a special way as described here:

http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.chacha20poly1305?annotate=HEAD

Stef