=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 message authentication code
=head1 SYNOPSIS
int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len);
void HMAC_CTX_cleanup(HMAC_CTX *ctx);
- void HMAC_cleanup(HMAC_CTX *ctx);
=head1 DESCRIPTION
the output is placed in B<md_len>, unless it is B<NULL>.
B<evp_md> can be EVP_sha1(), EVP_ripemd160() etc.
-B<key> and B<evp_md> may be B<NULL> if a key and hash function have
-been set in a previous call to HMAC_Init() for that B<HMAC_CTX>.
HMAC_CTX_init() initialises a B<HMAC_CTX> before first use. It must be
called.
and releases any associated resources. It must be called when an
B<HMAC_CTX> is no longer required.
-HMAC_cleanup() is an alias for HMAC_CTX_cleanup() included for back
-compatibility with 0.9.6b, it is deprecated.
-
The following functions may be used if the message is not completely
stored in memory:
=head1 SEE ALSO
-L<sha(3)|sha(3)>, L<evp(3)|evp(3)>
+L<sha(3)>, L<evp(3)>
=head1 HISTORY
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