hmac(3) OpenSSL hmac(3)
HMAC, HMAC_Init, HMAC_Update, HMAC_Final, HMAC_cleanup - HMAC message authentication code
unsigned char *HMAC(const EVP_MD *evp_md, const void *key,
int key_len, const unsigned char *d, int n,
unsigned char *md, unsigned int *md_len);
void HMAC_CTX_init(HMAC_CTX *ctx);
void 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);
void HMAC_CTX_cleanup(HMAC_CTX *ctx);
void HMAC_cleanup(HMAC_CTX *ctx);
HMAC is a MAC (message authentication code), i.e. a keyed hash function used for message
authentication, which is based on a hash function.
HMAC() computes the message authentication code of the n bytes at d using the hash func-
tion evp_md and the key key which is key_len bytes long.
It places the result in md (which must have space for the output of the hash function,
which is no more than EVP_MAX_MD_SIZE bytes). If md is NULL, the digest is placed in a
static array. The size of the output is placed in md_len, unless it is NULL.
evp_md can be EVP_sha1(), EVP_ripemd160() etc. key and evp_md may be NULL if a key and
hash function have been set in a previous call to HMAC_Init() for that HMAC_CTX.
HMAC_CTX_init() initialises a HMAC_CTX before first use. It must be called.
HMAC_CTX_cleanup() erases the key and other data from the HMAC_CTX and releases any asso-
ciated resources. It must be called when an 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:
HMAC_Init() initializes a HMAC_CTX structure to use the hash function evp_md and the key
key which is key_len bytes long. It is deprecated and only included for backward compati-
bility with OpenSSL 0.9.6b.
HMAC_Init_ex() initializes or reuses a HMAC_CTX structure to use the function evp_md and
key key. Either can be NULL, in which case the existing one will be reused.
HMAC_CTX_init() must have been called before the first use of an HMAC_CTX in this func-
tion. N.B. HMAC_Init() had this undocumented behaviour in previous versions of OpenSSL -
failure to switch to HMAC_Init_ex() in programs that expect it will cause them to stop
HMAC_Update() can be called repeatedly with chunks of the message to be authenticated (len
bytes at data).
HMAC_Final() places the message authentication code in md, which must have space for the
hash function output.
HMAC() returns a pointer to the message authentication code.
HMAC_CTX_init(), HMAC_Init_ex(), HMAC_Update(), HMAC_Final() and HMAC_CTX_cleanup() do not
HMAC(), HMAC_Init(), HMAC_Update(), HMAC_Final() and HMAC_cleanup() are available since
HMAC_CTX_init(), HMAC_Init_ex() and HMAC_CTX_cleanup() are available since OpenSSL 0.9.7.
0.9.7d 2003-11-20 hmac(3)