res = authhash(nonce, nonce_len, config->password, algo);
if(!res) {
protocol_error(c, op, c->rc, "%s: unknown authentication algorithm '%s'",
res = authhash(nonce, nonce_len, config->password, algo);
if(!res) {
protocol_error(c, op, c->rc, "%s: unknown authentication algorithm '%s'",