=head1 NAME
-HMAC, HMAC_Init, HMAC_Update, HMAC_Final, HMAC_cleanup - HMAC message
-authentication code
+HMAC, HMAC_CTX_init, HMAC_Init, HMAC_Init_ex, HMAC_Update, HMAC_Final, HMAC_CTX_cleanup,
+HMAC_cleanup - HMAC message authentication code
=head1 SYNOPSIS
since OpenSSL 0.9.7.
HMAC_Init_ex(), HMAC_Update() and HMAC_Final() did not return values in
-versions of OpenSSL before 0.9.9.
+versions of OpenSSL before 1.0.0.
=cut