sshkey_pkey_digest_sign
if ((ret = sshkey_pkey_digest_sign(key->pkey, hash_alg, &sigb, &slen,
if ((ret = sshkey_pkey_digest_sign(key->pkey, hash_alg, &sig, &len,
int sshkey_pkey_digest_sign(EVP_PKEY*, int, u_char **,