hmac_sha256_preparekey
hmac_sha256_preparekey(HMAC_SHA256_KEY(tfm), raw_key, keylen);
hmac_sha256_preparekey(&k.sha256, raw_key, raw_key_len);
hmac_sha256_preparekey(&key, auth_key, auth_keylen);
void hmac_sha256_preparekey(struct hmac_sha256_key *key,
EXPORT_SYMBOL_GPL(hmac_sha256_preparekey);
#define HMAC_PREPAREKEY hmac_sha256_preparekey
hmac_sha256_preparekey(&key->hmac_key, key->key, key->len);
hmac_sha256_preparekey(&con->v2.hmac_key, session_key, session_key_len);
hmac_sha256_preparekey(&hinfo->key.sha256,
hmac_sha256_preparekey(key, raw_key, sizeof(raw_key));