mptcp_crypto_hmac_sha
EXPORT_SYMBOL_GPL(mptcp_crypto_hmac_sha);
mptcp_crypto_hmac_sha(key1, key2, msg, 8, hmac);
mptcp_crypto_hmac_sha(key1, key2, msg, i, hmac);
void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
mptcp_crypto_hmac_sha(key1, key2, msg, 8, hmac);