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Diffstat (limited to 'secure/lib/libcrypto/man/hmac.3')
-rw-r--r-- | secure/lib/libcrypto/man/hmac.3 | 212 |
1 files changed, 212 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..9d6d769 --- /dev/null +++ b/secure/lib/libcrypto/man/hmac.3 @@ -0,0 +1,212 @@ +.\" Automatically generated by Pod::Man version 1.15 +.\" Thu May 9 13:19:23 2002 +.\" +.\" 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 Ip \" List item +.br +.ie \\n(.$>=3 .ne \\$3 +.el .ne 3 +.IP "\\$1" \\$2 +.. +.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++. 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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_cleanup()\fR erases the key and other data from the \fB\s-1HMAC_CTX\s0\fR. +.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. +.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" +\&\fIHMAC()\fR returns a pointer to the message authentication code. +.PP +\&\fIHMAC_Init()\fR, \fIHMAC_Update()\fR, \fIHMAC_Final()\fR and \fIHMAC_cleanup()\fR do not +return values. +.SH "CONFORMING TO" +.IX Header "CONFORMING TO" +\&\s-1RFC\s0 2104 +.SH "SEE ALSO" +.IX Header "SEE ALSO" +sha(3), evp(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIHMAC()\fR, \fIHMAC_Init()\fR, \fIHMAC_Update()\fR, \fIHMAC_Final()\fR and \fIHMAC_cleanup()\fR +are available since SSLeay 0.9.0. |