273 lines
6.7 KiB
Groff
273 lines
6.7 KiB
Groff
.rn '' }`
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'''
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'''
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.de Sh
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.br
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.if t .Sp
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.ne 5
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.PP
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\fB\\$1\fR
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.PP
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..
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.de Sp
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.if t .sp .5v
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.ie \\n(.$>=3 .ne \\$3
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.IP "\\$1" \\$2
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.de Vb
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.nf
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.de Ve
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.fi
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
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''' \*(L" and \*(R", except that they are used on ".xx" lines,
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''' such as .IP and .SH, which do another additional levels of
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''' double-quote interpretation
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'br\}
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.if \nF \{
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.de IX
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.tm Index:\\$1\t\\n%\t"\\$2"
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.nr % 0
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.rr F
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.\}
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.TH hmac 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.ft CW
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'if n "\c
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\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
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'.ft R
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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. \" AM - accent mark definitions
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.bd B 3
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. \" fudge factors for nroff and troff
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. \" corrections for vroff
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.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
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. \" for low resolution devices (crt and lpr)
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.if \n(.H>23 .if \n(.V>19 \
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\{\
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. ds 8 ss
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. ds 3 3
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. ds th \o'bp'
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. ds Ae AE
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. ds oe oe
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. ds Oe OE
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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HMAC, HMAC_Init, HMAC_Update, HMAC_Final \- HMAC message authentication code
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/hmac.h>
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.Ve
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.Vb 3
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\& unsigned char *HMAC(const EVP_MD *evp_md, const void *key,
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\& int key_len, const unsigned char *d, int n,
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\& unsigned char *md, unsigned int *md_len);
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.Ve
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.Vb 4
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\& void HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len,
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\& const EVP_MD *md);
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\& void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len);
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\& void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len);
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.Ve
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.Vb 1
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\& void HMAC_cleanup(HMAC_CTX *ctx);
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.Ve
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.SH "DESCRIPTION"
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HMAC is a MAC (message authentication code), i.e. a keyed hash
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function used for message authentication, which is based on a hash
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function.
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.PP
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\fIHMAC()\fR computes the message authentication code of the \fBn\fR bytes at
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\fBd\fR using the hash function \fBevp_md\fR and the key \fBkey\fR which is
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\fBkey_len\fR bytes long.
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.PP
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It places the result in \fBmd\fR (which must have space for the output of
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the hash function, which is no more than \fBEVP_MAX_MD_SIZE\fR bytes).
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If \fBmd\fR is NULL, the digest is placed in a static array. The size of
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the output is placed in \fBmd_len\fR, unless it is \fBNULL\fR.
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.PP
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\fBevp_md\fR can be \fIEVP_sha1()\fR, \fIEVP_ripemd160()\fR etc.
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\fBkey\fR and \fBevp_md\fR may be \fBNULL\fR if a key and hash function have
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been set in a previous call to \fIHMAC_Init()\fR for that \fBHMAC_CTX\fR.
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.PP
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\fIHMAC_cleanup()\fR erases the key and other data from the \fBHMAC_CTX\fR.
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.PP
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The following functions may be used if the message is not completely
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stored in memory:
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.PP
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\fIHMAC_Init()\fR initializes a \fBHMAC_CTX\fR structure to use the hash
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function \fBevp_md\fR and the key \fBkey\fR which is \fBkey_len\fR bytes long.
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.PP
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\fIHMAC_Update()\fR can be called repeatedly with chunks of the message to
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be authenticated (\fBlen\fR bytes at \fBdata\fR).
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.PP
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\fIHMAC_Final()\fR places the message authentication code in \fBmd\fR, which
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must have space for the hash function output.
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.SH "RETURN VALUES"
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\fIHMAC()\fR returns a pointer to the message authentication code.
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.PP
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\fIHMAC_Init()\fR, \fIHMAC_Update()\fR, \fIHMAC_Final()\fR and \fIHMAC_cleanup()\fR do not
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return values.
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.SH "CONFORMING TO"
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RFC 2104
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.SH "SEE ALSO"
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the \fIsha(3)|sha(3)\fR manpage, the \fIevp(3)|evp(3)\fR manpage
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.SH "HISTORY"
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\fIHMAC()\fR, \fIHMAC_Init()\fR, \fIHMAC_Update()\fR, \fIHMAC_Final()\fR and \fIHMAC_cleanup()\fR
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are available since SSLeay 0.9.0.
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.rn }` ''
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.IX Title "hmac 3"
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.IX Name "HMAC, HMAC_Init, HMAC_Update, HMAC_Final - HMAC message authentication code"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "RETURN VALUES"
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.IX Header "CONFORMING TO"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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