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Diffstat (limited to 'secure/lib/libcrypto/man/hmac.3')
-rw-r--r-- | secure/lib/libcrypto/man/hmac.3 | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/hmac.3 b/secure/lib/libcrypto/man/hmac.3 new file mode 100644 index 0000000..629d5d8 --- /dev/null +++ b/secure/lib/libcrypto/man/hmac.3 @@ -0,0 +1,233 @@ +.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.14 +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.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. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to +.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C' +.\" expand to `' in nroff, nothing in troff, for use with C<>. +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr for +.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index +.\" entries marked with X<> in POD. Of course, you'll have to process the +.\" output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.hy 0 +.if n .na +.\" +.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). +.\" Fear. Run. Save yourself. No user-serviceable parts. +. \" fudge factors for nroff and troff +.if n \{\ +. ds #H 0 +. ds #V .8m +. ds #F .3m +. ds #[ \f1 +. ds #] \fP +.\} +.if t \{\ +. ds #H ((1u-(\\\\n(.fu%2u))*.13m) +. ds #V .6m +. ds #F 0 +. ds #[ \& +. ds #] \& +.\} +. \" simple accents for nroff and troff +.if n \{\ +. ds ' \& +. ds ` \& +. ds ^ \& +. ds , \& +. ds ~ ~ +. ds / +.\} +.if t \{\ +. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" +. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' +. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' +. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' +. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' +. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' +.\} +. \" troff and (daisy-wheel) nroff accents +.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' +.ds 8 \h'\*(#H'\(*b\h'-\*(#H' +.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] +.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' +.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' +.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] +.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] +.ds ae a\h'-(\w'a'u*4/10)'e +.ds Ae A\h'-(\w'A'u*4/10)'E +. \" corrections for vroff +.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' +.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' +. \" for low resolution devices (crt and lpr) +.if \n(.H>23 .if \n(.V>19 \ +\{\ +. ds : e +. ds 8 ss +. ds o a +. ds d- d\h'-1'\(ga +. ds D- D\h'-1'\(hy +. ds th \o'bp' +. ds Th \o'LP' +. ds ae ae +. ds Ae AE +.\} +.rm #[ #] #H #V #F C +.\" ======================================================================== +.\" +.IX Title "hmac 3" +.TH hmac 3 "2005-02-24" "0.9.7d" "OpenSSL" +.SH "NAME" +HMAC, HMAC_Init, HMAC_Update, HMAC_Final, HMAC_cleanup \- HMAC message +authentication code +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/hmac.h> +.Ve +.PP +.Vb 3 +\& 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); +.Ve +.PP +.Vb 1 +\& void HMAC_CTX_init(HMAC_CTX *ctx); +.Ve +.PP +.Vb 6 +\& 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); +.Ve +.PP +.Vb 2 +\& void HMAC_CTX_cleanup(HMAC_CTX *ctx); +\& void HMAC_cleanup(HMAC_CTX *ctx); +.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\fIHMAC\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. +.PP +\&\fBevp_md\fR can be \fIEVP_sha1()\fR, \fIEVP_ripemd160()\fR etc. +\&\fBkey\fR and \fBevp_md\fR may be \fB\s-1NULL\s0\fR if a key and hash function have +been set in a previous call to \fIHMAC_Init()\fR for that \fB\s-1HMAC_CTX\s0\fR. +.PP +\&\fIHMAC_CTX_init()\fR initialises a \fB\s-1HMAC_CTX\s0\fR before first use. It must be +called. +.PP +\&\fIHMAC_CTX_cleanup()\fR erases the key and other data from the \fB\s-1HMAC_CTX\s0\fR +and releases any associated resources. It must be called when an +\&\fB\s-1HMAC_CTX\s0\fR is no longer required. +.PP +\&\fIHMAC_cleanup()\fR is an alias for \fIHMAC_CTX_cleanup()\fR included for back +compatibility with 0.9.6b, it is deprecated. +.PP +The following functions may be used if the message is not completely +stored in memory: +.PP +\&\fIHMAC_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. It is deprecated and only included for backward compatibility +with OpenSSL 0.9.6b. +.PP +\&\fIHMAC_Init_ex()\fR initializes or reuses a \fB\s-1HMAC_CTX\s0\fR structure to use +the function \fBevp_md\fR and key \fBkey\fR. Either can be \s-1NULL\s0, in which +case the existing one will be reused. \fIHMAC_CTX_init()\fR must have been +called before the first use of an \fB\s-1HMAC_CTX\s0\fR in this +function. \fBN.B. \f(BIHMAC_Init()\fB had this undocumented behaviour in +previous versions of OpenSSL \- failure to switch to \f(BIHMAC_Init_ex()\fB in +programs that expect it will cause them to stop working\fR. +.PP +\&\fIHMAC_Update()\fR can be called repeatedly with chunks of the message to +be authenticated (\fBlen\fR bytes at \fBdata\fR). +.PP +\&\fIHMAC_Final()\fR places the message authentication code in \fBmd\fR, which +must have space for the hash function output. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\s-1\fIHMAC\s0()\fR returns a pointer to the message authentication code. +.PP +\&\fIHMAC_CTX_init()\fR, \fIHMAC_Init_ex()\fR, \fIHMAC_Update()\fR, \fIHMAC_Final()\fR and +\&\fIHMAC_CTX_cleanup()\fR do not return values. +.SH "CONFORMING TO" +.IX Header "CONFORMING TO" +\&\s-1RFC\s0 2104 +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIsha\fR\|(3), \fIevp\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\s-1\fIHMAC\s0()\fR, \fIHMAC_Init()\fR, \fIHMAC_Update()\fR, \fIHMAC_Final()\fR and \fIHMAC_cleanup()\fR +are available since SSLeay 0.9.0. +.PP +\&\fIHMAC_CTX_init()\fR, \fIHMAC_Init_ex()\fR and \fIHMAC_CTX_cleanup()\fR are available +since OpenSSL 0.9.7. |