Hello, I've found that when using the ssh agent and sshd together, there is an issue when using multiple host keys. Specifically, after the key exchange phase, when a client requests proof of ownership for the host keys via the "hostkeys-prove-00@xxxxxxxxxxx" request, the server prepares the response without specifying the signature algoorithm in case of non-RSA keys. This leads to "SSH_ERR_INVALID_ARGUMENT" when verifying the signature in : openssh-portable/authfd.c line if ((r = sshkey_check_sigtype(sig, len, alg)) != 0) To resolve this, I explicitly sets the signature algorithm, ensuring proper verification for all key types. I would appreciate any feedback or suggestions regarding this issue. Best regards, Maxime
