Testing GOST R 34.10 - PurpleI2P/i2pd GitHub Wiki
Create additional http proxy tunnel in the tunnels.conf
[GOSTProxy]
type=httpproxy
port=insert port number here
keys=gost.dat
signaturetype=10
Connect through this proxy to 333.i2p or any other GOST-capable eepsite. It should respond.
9 is GOST R 34.10-2012 CryptoProA with GOST R 34.11-2012-256
10 is GOST R 34.10-2012 tc26-paramSetA-512 with GOST R 34.11-2012-512