NAME
HMAC, HMAC_CTX_new, HMAC_CTX_reset, HMAC_CTX_free, HMAC_Init, HMAC_Init_ex, HMAC_Update, HMAC_Final, HMAC_CTX_copy, HMAC_CTX_set_flags, HMAC_CTX_get_md, HMAC_size - HMAC message authentication code
SYNOPSIS
#include <openssl/hmac.h>
Deprecated since OpenSSL 3.0, can be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value, see 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);
HMAC_CTX *HMAC_CTX_new(void);
int HMAC_CTX_reset(HMAC_CTX *ctx);
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_free(HMAC_CTX *ctx);
int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx);
void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags);
const EVP_MD *HMAC_CTX_get_md(const HMAC_CTX *ctx);
size_t HMAC_size(const HMAC_CTX *e);
Deprecated since OpenSSL 1.1.0, can be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value, see int HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len,
const EVP_MD *md);
All of the functions described on this page are deprecated. Applications should instead use EVP_MAC_CTX_free(3), EVP_MAC_update(3) and EVP_MD_CTX_set_flags(3). HMAC_CTX_get_md() returns the EVP_MD that has previously been set for the supplied HMAC_CTX. HMAC_size() returns the length in bytes of the underlying hash function output. HMAC() returns a pointer to the message authentication code or NULL if an error occurred. HMAC_CTX_new() returns a pointer to a new HMAC_CTX on success or NULL if an error occurred. HMAC_CTX_reset(), HMAC_Init_ex(), HMAC_Update(), HMAC_Final() and HMAC_CTX_copy() return 1 for success or 0 if an error occurred. HMAC_CTX_get_md() return the EVP_MD previously set for the supplied HMAC_CTX or NULL if no EVP_MD has been set. HMAC_size() returns the length in bytes of the underlying hash function output or zero on error. RFC 2104 All of these functions were deprecated in OpenSSL 3.0. HMAC_CTX_init() was replaced with HMAC_CTX_reset() in OpenSSL 1.1.0. HMAC_CTX_cleanup() existed in OpenSSL before version 1.1.0. HMAC_CTX_new(), HMAC_CTX_free() and HMAC_CTX_get_md() are new in OpenSSL 1.1.0. HMAC_Init_ex(), HMAC_Update() and HMAC_Final() did not return values in OpenSSL before version 1.0.0. Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved. Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.DESCRIPTION
RETURN VALUES
CONFORMING TO
SEE ALSO
HISTORY
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