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Edit File : HMAC_CTX_get_md.3 \| Size : 9.72 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/hmac.h> \& \& unsigned char HMAC(const EVP_MD evp_md, const void key, \& int key_len, const unsigned char d, size_t 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, size_t 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); .Ve .PP Deprecated: .PP .Vb 4 \& #if OPENSSL_API_COMPAT < 0x10100000L \& int HMAC_Init(HMAC_CTX ctx, const void key, int key_len, \& const EVP_MD md); \& #endif .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\s-1HMAC\s0 is a \s-1MAC\s0 (message authentication code), i.e. a keyed hash function used for message authentication, which is based on a hash function. .PP \&\s-1\fBHMAC\s0()\fR computes the message authentication code of the \fBn\fR bytes at \&\fBd\fR using the hash function \fBevp_md\fR and the key \fBkey\fR which is \&\fBkey_len\fR bytes long. .PP It places the result in \fBmd\fR (which must have space for the output of the hash function, which is no more than \fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes). If \fBmd\fR is \s-1NULL,\s0 the digest is placed in a static array. The size of the output is placed in \fBmd_len\fR, unless it is \fB\s-1NULL\s0\fR. Note: passing a \s-1NULL\s0 value for \fBmd\fR to use the static array is not thread safe. .PP \&\fBevp_md\fR is a message digest such as \fBEVP_sha1()\fR, \fBEVP_ripemd160()\fR etc. \s-1HMAC\s0 does not support variable output length digests such as \fBEVP_shake128()\fR and \&\fBEVP_shake256()\fR. .PP \&\fBHMAC_CTX_new()\fR creates a new \s-1HMAC_CTX\s0 in heap memory. .PP \&\fBHMAC_CTX_reset()\fR zeros an existing \fB\s-1HMAC_CTX\s0\fR and associated resources, making it suitable for new computations as if it was newly created with \fBHMAC_CTX_new()\fR. .PP \&\fBHMAC_CTX_free()\fR erases the key and other data from the \fB\s-1HMAC_CTX\s0\fR, releases any associated resources and finally frees the \fB\s-1HMAC_CTX\s0\fR itself. .PP The following functions may be used if the message is not completely stored in memory: .PP \&\fBHMAC_Init_ex()\fR initializes or reuses a \fB\s-1HMAC_CTX\s0\fR structure to use the hash function \fBevp_md\fR and key \fBkey\fR. If both are \s-1NULL,\s0 or if \fBkey\fR is \s-1NULL\s0 and \fBevp_md\fR is the same as the previous call, then the existing key is reused. \fBctx\fR must have been created with \fBHMAC_CTX_new()\fR before the first use of an \fB\s-1HMAC_CTX\s0\fR in this function. .PP If \fBHMAC_Init_ex()\fR is called with \fBkey\fR \s-1NULL\s0 and \fBevp_md\fR is not the same as the previous digest used by \fBctx\fR then an error is returned because reuse of an existing key with a different digest is not supported. .PP \&\fBHMAC_Init()\fR initializes a \fB\s-1HMAC_CTX\s0\fR structure to use the hash function \fBevp_md\fR and the key \fBkey\fR which is \fBkey_len\fR bytes long. .PP \&\fBHMAC_Update()\fR can be called repeatedly with chunks of the message to be authenticated (\fBlen\fR bytes at \fBdata\fR). .PP \&\fBHMAC_Final()\fR places the message authentication code in \fBmd\fR, which must have space for the hash function output. .PP \&\fBHMAC_CTX_copy()\fR copies all of the internal state from \fBsctx\fR into \fBdctx\fR. .PP \&\fBHMAC_CTX_set_flags()\fR applies the specified flags to the internal EVP_MD_CTXs. These flags have the same meaning as for \fBEVP_MD_CTX_set_flags\fR\\|(3). .PP \&\fBHMAC_CTX_get_md()\fR returns the \s-1EVP_MD\s0 that has previously been set for the supplied \s-1HMAC_CTX.\s0 .PP \&\fBHMAC_size()\fR returns the length in bytes of the underlying hash function output. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fBHMAC\s0()\fR returns a pointer to the message authentication code or \s-1NULL\s0 if an error occurred. .PP \&\fBHMAC_CTX_new()\fR returns a pointer to a new \fB\s-1HMAC_CTX\s0\fR on success or \&\fB\s-1NULL\s0\fR if an error occurred. .PP \&\fBHMAC_CTX_reset()\fR, \fBHMAC_Init_ex()\fR, \fBHMAC_Update()\fR, \fBHMAC_Final()\fR and \&\fBHMAC_CTX_copy()\fR return 1 for success or 0 if an error occurred. .PP \&\fBHMAC_CTX_get_md()\fR return the \s-1EVP_MD\s0 previously set for the supplied \s-1HMAC_CTX\s0 or \&\s-1NULL\s0 if no \s-1EVP_MD\s0 has been set. .PP \&\fBHMAC_size()\fR returns the length in bytes of the underlying hash function output or zero on error. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1RFC 2104\s0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\s-1\fBSHA1\s0\fR\\|(3), \fBevp\fR\\|(7) .SH "HISTORY" .IX Header "HISTORY" \&\fBHMAC_CTX_init()\fR was replaced with \fBHMAC_CTX_reset()\fR in OpenSSL 1.1.0. .PP \&\fBHMAC_CTX_cleanup()\fR existed in OpenSSL before version 1.1.0. .PP \&\fBHMAC_CTX_new()\fR, \fBHMAC_CTX_free()\fR and \fBHMAC_CTX_get_md()\fR are new in OpenSSL 1.1.0. .PP \&\fBHMAC_Init_ex()\fR, \fBHMAC_Update()\fR and \fBHMAC_Final()\fR did not return values in OpenSSL before version 1.0.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>. Back

Edit File : HMAC_CTX_get_md.3 | Size : 9.72 KB

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.\" ========================================================================
.\"
.IX Title "HMAC 3"
.TH HMAC 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "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
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/hmac.h>
\&
\& unsigned char *HMAC(const EVP_MD *evp_md, const void *key,
\&                     int key_len, const unsigned char *d, size_t 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, size_t 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);
.Ve
.PP
Deprecated:
.PP
.Vb 4
\& #if OPENSSL_API_COMPAT < 0x10100000L
\& int HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len,
\&               const EVP_MD *md);
\& #endif
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1HMAC\s0 is a \s-1MAC\s0 (message authentication code), i.e. a keyed hash
function used for message authentication, which is based on a hash
function.
.PP
\&\s-1\fBHMAC\s0()\fR computes the message authentication code of the \fBn\fR bytes at
\&\fBd\fR using the hash function \fBevp_md\fR and the key \fBkey\fR which is
\&\fBkey_len\fR bytes long.
.PP
It places the result in \fBmd\fR (which must have space for the output of
the hash function, which is no more than \fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes).
If \fBmd\fR is \s-1NULL,\s0 the digest is placed in a static array.  The size of
the output is placed in \fBmd_len\fR, unless it is \fB\s-1NULL\s0\fR. Note: passing a \s-1NULL\s0
value for \fBmd\fR  to use the static array is not thread safe.
.PP
\&\fBevp_md\fR is a message digest such as \fBEVP_sha1()\fR, \fBEVP_ripemd160()\fR etc. \s-1HMAC\s0 does
not support variable output length digests such as \fBEVP_shake128()\fR and
\&\fBEVP_shake256()\fR.
.PP
\&\fBHMAC_CTX_new()\fR creates a new \s-1HMAC_CTX\s0 in heap memory.
.PP
\&\fBHMAC_CTX_reset()\fR zeros an existing \fB\s-1HMAC_CTX\s0\fR and associated
resources, making it suitable for new computations as if it was newly
created with \fBHMAC_CTX_new()\fR.
.PP
\&\fBHMAC_CTX_free()\fR erases the key and other data from the \fB\s-1HMAC_CTX\s0\fR,
releases any associated resources and finally frees the \fB\s-1HMAC_CTX\s0\fR
itself.
.PP
The following functions may be used if the message is not completely
stored in memory:
.PP
\&\fBHMAC_Init_ex()\fR initializes or reuses a \fB\s-1HMAC_CTX\s0\fR structure to use the hash
function \fBevp_md\fR and key \fBkey\fR. If both are \s-1NULL,\s0 or if \fBkey\fR is \s-1NULL\s0
and \fBevp_md\fR is the same as the previous call, then the
existing key is
reused. \fBctx\fR must have been created with \fBHMAC_CTX_new()\fR before the first use
of an \fB\s-1HMAC_CTX\s0\fR in this function.
.PP
If \fBHMAC_Init_ex()\fR is called with \fBkey\fR \s-1NULL\s0 and \fBevp_md\fR is not the
same as the previous digest used by \fBctx\fR then an error is returned
because reuse of an existing key with a different digest is not supported.
.PP
\&\fBHMAC_Init()\fR initializes a \fB\s-1HMAC_CTX\s0\fR structure to use the hash
function \fBevp_md\fR and the key \fBkey\fR which is \fBkey_len\fR bytes
long.
.PP
\&\fBHMAC_Update()\fR can be called repeatedly with chunks of the message to
be authenticated (\fBlen\fR bytes at \fBdata\fR).
.PP
\&\fBHMAC_Final()\fR places the message authentication code in \fBmd\fR, which
must have space for the hash function output.
.PP
\&\fBHMAC_CTX_copy()\fR copies all of the internal state from \fBsctx\fR into \fBdctx\fR.
.PP
\&\fBHMAC_CTX_set_flags()\fR applies the specified flags to the internal EVP_MD_CTXs.
These flags have the same meaning as for \fBEVP_MD_CTX_set_flags\fR\|(3).
.PP
\&\fBHMAC_CTX_get_md()\fR returns the \s-1EVP_MD\s0 that has previously been set for the
supplied \s-1HMAC_CTX.\s0
.PP
\&\fBHMAC_size()\fR returns the length in bytes of the underlying hash function output.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\s-1\fBHMAC\s0()\fR returns a pointer to the message authentication code or \s-1NULL\s0 if
an error occurred.
.PP
\&\fBHMAC_CTX_new()\fR returns a pointer to a new \fB\s-1HMAC_CTX\s0\fR on success or
\&\fB\s-1NULL\s0\fR if an error occurred.
.PP
\&\fBHMAC_CTX_reset()\fR, \fBHMAC_Init_ex()\fR, \fBHMAC_Update()\fR, \fBHMAC_Final()\fR and
\&\fBHMAC_CTX_copy()\fR return 1 for success or 0 if an error occurred.
.PP
\&\fBHMAC_CTX_get_md()\fR return the \s-1EVP_MD\s0 previously set for the supplied \s-1HMAC_CTX\s0 or
\&\s-1NULL\s0 if no \s-1EVP_MD\s0 has been set.
.PP
\&\fBHMAC_size()\fR returns the length in bytes of the underlying hash function output
or zero on error.
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1RFC 2104\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1\fBSHA1\s0\fR\|(3), \fBevp\fR\|(7)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBHMAC_CTX_init()\fR was replaced with \fBHMAC_CTX_reset()\fR in OpenSSL 1.1.0.
.PP
\&\fBHMAC_CTX_cleanup()\fR existed in OpenSSL before version 1.1.0.
.PP
\&\fBHMAC_CTX_new()\fR, \fBHMAC_CTX_free()\fR and \fBHMAC_CTX_get_md()\fR are new in OpenSSL 1.1.0.
.PP
\&\fBHMAC_Init_ex()\fR, \fBHMAC_Update()\fR and \fBHMAC_Final()\fR did not return values in
OpenSSL before version 1.0.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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