267 lines
7.0 KiB
Groff
267 lines
7.0 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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.if n .sp
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.de Ip
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.br
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.ie \\n(.$>=3 .ne \\$3
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.el .ne 3
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.IP "\\$1" \\$2
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..
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.de Vb
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.ft CW
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.nf
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.ne \\$1
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.de Ve
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.ft R
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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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.if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
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.ds L" ""
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.ds R" ""
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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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.ds M" """
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.ds T" """""
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.ds L' '
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'br\}
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.el\{\
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.ds -- \(em\|
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.tr \*(Tr
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.ds L' `
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.ds M' `
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.ds PI \(*p
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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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..
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.nr % 0
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.rr F
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.\}
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.TH EVP_VerifyInit 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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.de CQ \" put $1 in typewriter font
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.ft CW
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'if n "\c
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'if t \\&\\$1\c
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'if n \\&\\$1\c
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'if n \&"
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\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
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'.ft R
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..
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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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.if n \{\
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.\}
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.if t \{\
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.\}
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. \" simple accents for nroff and troff
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.if n \{\
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. ds ' \&
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.\}
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. \" troff and (daisy-wheel) nroff accents
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.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
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.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
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.ds _ \\k:\h'-(\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\n:u'
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.ds . \\k:\h'-(\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\n:u'
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.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
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.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
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.ds Ae A\h'-(\w'A'u*4/10)'E
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.ds oe o\h'-(\w'o'u*4/10)'e
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.ds Oe O\h'-(\w'O'u*4/10)'E
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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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.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\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 : e
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. ds 8 ss
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. ds v \h'-1'\o'\(aa\(ga'
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. ds _ \h'-1'^
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. ds . \h'-1'.
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. ds 3 3
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. ds o a
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. ds d- d\h'-1'\(ga
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. ds D- D\h'-1'\(hy
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. ds th \o'bp'
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. ds Th \o'LP'
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. ds ae ae
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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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EVP_VerifyInit, EVP_VerifyUpdate, EVP_VerifyFinal \- EVP signature verification functions
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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/evp.h>
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.Ve
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.Vb 3
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\& void EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type);
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\& void EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt);
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\& int EVP_VerifyFinal(EVP_MD_CTX *ctx,unsigned char *sigbuf, unsigned int siglen,EVP_PKEY *pkey);
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.Ve
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.SH "DESCRIPTION"
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The EVP signature verification routines are a high level interface to digital
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signatures.
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.PP
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\fIEVP_VerifyInit()\fR initialises a verification context \fBctx\fR to using digest
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\fBtype\fR: this will typically be supplied by a function such as \fIEVP_sha1()\fR.
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.PP
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\fIEVP_VerifyUpdate()\fR hashes \fBcnt\fR bytes of data at \fBd\fR into the
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verification context \fBctx\fR. This funtion can be called several times on the
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same \fBctx\fR to include additional data.
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.PP
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\fIEVP_VerifyFinal()\fR verifies the data in \fBctx\fR using the public key \fBpkey\fR
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and against the \fBsiglen\fR bytes at \fBsigbuf\fR. After calling \fIEVP_VerifyFinal()\fR
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no additional calls to \fIEVP_VerifyUpdate()\fR can be made, but \fIEVP_VerifyInit()\fR
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can be called to initialiase a new verification operation.
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.SH "RETURN VALUES"
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\fIEVP_VerifyInit()\fR and \fIEVP_VerifyUpdate()\fR do not return values.
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.PP
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\fIEVP_VerifyFinal()\fR returns 1 for a correct signature, 0 for failure and \-1 if some
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other error occurred.
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.PP
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The error codes can be obtained by the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
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.SH "NOTES"
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The \fBEVP\fR interface to digital signatures should almost always be used in
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preference to the low level interfaces. This is because the code then becomes
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transparent to the algorithm used and much more flexible.
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.PP
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Due to the link between message digests and public key algorithms the correct
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digest algorithm must be used with the correct public key type. A list of
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algorithms and associated public key algorithms appears in
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the \fIEVP_DigestInit(3)|EVP_DigestInit(3)\fR manpage.
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.SH "BUGS"
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Several of the functions do not return values: maybe they should. Although the
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internal digest operations will never fail some future hardware based operations
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might.
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.SH "SEE ALSO"
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the \fIEVP_SignInit(3)|EVP_SignInit(3)\fR manpage,
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the \fIEVP_DigestInit(3)|EVP_DigestInit(3)\fR manpage, the \fIerr(3)|err(3)\fR manpage,
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the \fIevp(3)|evp(3)\fR manpage, the \fIhmac(3)|hmac(3)\fR manpage, the \fImd2(3)|md2(3)\fR manpage,
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the \fImd5(3)|md5(3)\fR manpage, the \fImdc2(3)|mdc2(3)\fR manpage, the \fIripemd(3)|ripemd(3)\fR manpage,
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the \fIsha(3)|sha(3)\fR manpage, the \fIdigest(1)|digest(1)\fR manpage
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.SH "HISTORY"
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\fIEVP_VerifyInit()\fR, \fIEVP_VerifyUpdate()\fR and \fIEVP_VerifyFinal()\fR are
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available in all versions of SSLeay and OpenSSL.
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.rn }` ''
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.IX Title "EVP_VerifyInit 3"
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.IX Name "EVP_VerifyInit, EVP_VerifyUpdate, EVP_VerifyFinal - EVP signature verification functions"
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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 "NOTES"
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.IX Header "BUGS"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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