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134 .TH HMAC 3ossl "2023-09-19" "3.0.11" "OpenSSL"
152 \&\- HMAC message authentication code
164 hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
186 hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
195 \&\s-1HMAC\s0 is a \s-1MAC\s0 (message authentication code), i.e. a keyed hash
199 \&\s-1\fBHMAC\s0()\fR computes the message authentication code of the \fIdata_len\fR bytes at
201 \&\fIkey_len\fR bytes long. The \fIkey\fR may also be \s-1NULL\s0 with \fIkey_len\fR being 0.
204 the hash function, which is no more than \fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes).
205 If \fImd\fR is \s-1NULL,\s0 the digest is placed in a static array.  The size of
206 the output is placed in \fImd_len\fR, unless it is \s-1NULL.\s0 Note: passing a \s-1NULL\s0
210 \&\s-1HMAC\s0 does not support variable output length digests such as \fBEVP_shake128()\fR and
213 \&\s-1\fBHMAC\s0()\fR uses the default \fB\s-1OSSL_LIB_CTX\s0\fR.
219 or the 'quick' single-shot \s-1MAC\s0 function \fBEVP_Q_mac\fR\|(3).
221 \&\fBHMAC_CTX_new()\fR creates a new \s-1HMAC_CTX\s0 in heap memory.
223 \&\fBHMAC_CTX_reset()\fR clears an existing \fB\s-1HMAC_CTX\s0\fR and associated
227 \&\fBHMAC_CTX_free()\fR erases the key and other data from the \fB\s-1HMAC_CTX\s0\fR,
228 releases any associated resources and finally frees the \fB\s-1HMAC_CTX\s0\fR
234 \&\fBHMAC_Init_ex()\fR initializes or reuses a \fB\s-1HMAC_CTX\s0\fR structure to use the hash
235 function \fIevp_md\fR and key \fIkey\fR. If both are \s-1NULL,\s0 or if \fIkey\fR is \s-1NULL\s0
237 existing key is
239 of an \fB\s-1HMAC_CTX\s0\fR in this function.
241 If \fBHMAC_Init_ex()\fR is called with \fIkey\fR \s-1NULL\s0 and \fIevp_md\fR is not the
243 because reuse of an existing key with a different digest is not supported.
245 \&\fBHMAC_Init()\fR initializes a \fB\s-1HMAC_CTX\s0\fR structure to use the hash
260 \&\fBHMAC_CTX_get_md()\fR returns the \s-1EVP_MD\s0 that has previously been set for the
261 supplied \s-1HMAC_CTX.\s0
266 \&\s-1\fBHMAC\s0()\fR returns a pointer to the message authentication code or \s-1NULL\s0 if
269 \&\fBHMAC_CTX_new()\fR returns a pointer to a new \fB\s-1HMAC_CTX\s0\fR on success or
270 \&\s-1NULL\s0 if an error occurred.
275 \&\fBHMAC_CTX_get_md()\fR return the \s-1EVP_MD\s0 previously set for the supplied \s-1HMAC_CTX\s0 …
276 \&\s-1NULL\s0 if no \s-1EVP_MD\s0 has been set.
282 \&\s-1RFC 2104\s0
285 \&\s-1\fBSHA1\s0\fR\|(3), \fBEVP_Q_mac\fR\|(3), \fBevp\fR\|(7)
288 All functions except for \s-1\fBHMAC\s0()\fR were deprecated in OpenSSL 3.0.
300 Copyright 2000\-2021 The OpenSSL Project Authors. All Rights Reserved.
304 in the file \s-1LICENSE\s0 in the source distribution or at