crypto_sign_ed25519_SECRETKEYBYTES
u_char sk[crypto_sign_ed25519_SECRETKEYBYTES];
if (key_handle_len != crypto_sign_ed25519_SECRETKEYBYTES) {
uint8_t provider_secretkey[crypto_sign_ed25519_SECRETKEYBYTES];
#define SECRETBYTES crypto_sign_ed25519_SECRETKEYBYTES
#if crypto_sign_ed25519_SECRETKEYBYTES <= crypto_sign_ed25519_PUBLICKEYBYTES
(crypto_sign_ed25519_SECRETKEYBYTES - crypto_sign_ed25519_PUBLICKEYBYTES)
#define ED25519_SK_SZ crypto_sign_ed25519_SECRETKEYBYTES
uint8_t provider_secretkey[crypto_sign_ed25519_SECRETKEYBYTES];