crypto_kem_sntrup761_BYTES
if ((r = sshbuf_reserve(buf, crypto_kem_sntrup761_BYTES,
dump_digest("server kem key:", kem_key, crypto_kem_sntrup761_BYTES);
if ((r = sshbuf_reserve(buf, crypto_kem_sntrup761_BYTES,
dump_digest("client kem key:", kem_key, crypto_kem_sntrup761_BYTES);