=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
void HMAC_CTX_init(HMAC_CTX *ctx);
- void HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len,
+ int HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len,
const EVP_MD *md);
- void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int key_len,
- const EVP_MD *md);
- void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len);
- void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len);
+ int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int key_len,
+ const EVP_MD *md, ENGINE *impl);
+ int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len);
+ 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);
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.
=head1 RETURN VALUES
-HMAC() returns a pointer to the message authentication code.
+HMAC() returns a pointer to the message authentication code or NULL if
+an error occurred.
-HMAC_CTX_init(), HMAC_Init_ex(), HMAC_Update(), HMAC_Final() and
-HMAC_CTX_cleanup() do not return values.
+HMAC_Init_ex(), HMAC_Update() and HMAC_Final() return 1 for success or 0 if
+an error occurred.
+
+HMAC_CTX_init() and HMAC_CTX_cleanup() do not return values.
=head1 CONFORMING TO
HMAC(), HMAC_Init(), HMAC_Update(), HMAC_Final() and HMAC_cleanup()
are available since SSLeay 0.9.0.
+HMAC_CTX_init(), HMAC_Init_ex() and HMAC_CTX_cleanup() are available
+since OpenSSL 0.9.7.
+
+HMAC_Init_ex(), HMAC_Update() and HMAC_Final() did not return values in
+versions of OpenSSL before 1.0.0.
+
=cut