264 lines
6.5 KiB
Groff
264 lines
6.5 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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..
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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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..
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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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'''
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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 S" """
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.ds N" """""
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.ds T" """""
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.ds L' '
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.ds M' '
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.ds S' '
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.ds N' '
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.ds T' '
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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 R" ''
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.ds M" ``
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.ds S" ''
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.ds N" ``
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.ds T" ''
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.ds L' `
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.ds R' '
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.ds M' `
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.ds S' '
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.ds N' `
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.ds T' '
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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 DSA_sign 3 "0.9.5a" "22/Jul/100" "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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. ds #H 0
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. ds #V .8m
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. ds #F .3m
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. ds #[ \f1
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. ds #] \fP
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.\}
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.if t \{\
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. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
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. ds #V .6m
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. ds #F 0
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. ds #[ \&
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. ds #] \&
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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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. ds ` \&
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. ds ^ \&
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. ds , \&
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. ds ~ ~
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. ds ? ?
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. ds ! !
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. ds /
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. ds q
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.\}
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.if t \{\
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. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
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. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
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. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
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. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
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. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
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. ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10'
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. ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m'
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. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
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. ds q o\h'-\w'o'u*8/10'\s-4\v'.4m'\z\(*i\v'-.4m'\s+4\h'\w'o'u*8/10'
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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 v \\k:\h'-(\\n(.wu*9/10-\*(#H)'\v'-\*(#V'\*(#[\s-4v\s0\v'\*(#V'\h'|\\n:u'\*(#]
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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 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#]
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.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\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 D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
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.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
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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 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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DSA_sign, DSA_sign_setup, DSA_verify \- DSA signatures
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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/dsa.h>
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.Ve
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.Vb 2
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\& int DSA_sign(int type, const unsigned char *dgst, int len,
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\& unsigned char *sigret, unsigned int *siglen, DSA *dsa);
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.Ve
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.Vb 2
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\& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
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\& BIGNUM **rp);
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.Ve
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.Vb 2
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\& int DSA_verify(int type, const unsigned char *dgst, int len,
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\& unsigned char *sigbuf, int siglen, DSA *dsa);
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.Ve
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.SH "DESCRIPTION"
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\fIDSA_sign()\fR computes a digital signature on the \fBlen\fR byte message
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digest \fBdgst\fR using the private key \fBdsa\fR and places its ASN.1 DER
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encoding at \fBsigret\fR. The length of the signature is places in
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*\fBsiglen\fR. \fBsigret\fR must point to \fIDSA_size\fR\|(\fBdsa\fR) bytes of memory.
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.PP
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\fIDSA_sign_setup()\fR may be used to precompute part of the signing
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operation in case signature generation is time-critical. It expects
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\fBdsa\fR to contain DSA parameters. It places the precomputed values
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in newly allocated \fBBIGNUM\fRs at *\fBkinvp\fR and *\fBrp\fR, after freeing
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the old ones unless *\fBkinvp\fR and *\fBrp\fR are NULL. These values may
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be passed to \fIDSA_sign()\fR in \fBdsa->kinv\fR and \fBdsa->r\fR.
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\fBctx\fR is a pre-allocated \fBBN_CTX\fR or NULL.
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.PP
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\fIDSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
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matches a given message digest \fBdgst\fR of size \fBlen\fR.
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\fBdsa\fR is the signer's public key.
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.PP
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The \fBtype\fR parameter is ignored.
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.PP
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The PRNG must be seeded before \fIDSA_sign()\fR (or \fIDSA_sign_setup()\fR)
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is called.
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.SH "RETURN VALUES"
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\fIDSA_sign()\fR and \fIDSA_sign_setup()\fR return 1 on success, 0 on error.
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\fIDSA_verify()\fR returns 1 for a valid signature, 0 for an incorrect
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signature and \-1 on error. The error codes can be obtained by
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the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
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.SH "CONFORMING TO"
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US Federal Information Processing Standard FIPS 186 (Digital Signature
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Standard, DSS), ANSI X9.30
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.SH "SEE ALSO"
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the \fIdsa(3)|dsa(3)\fR manpage, the \fIerr(3)|err(3)\fR manpage, the \fIrand(3)|rand(3)\fR manpage,
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the \fIDSA_do_sign(3)|DSA_do_sign(3)\fR manpage
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.SH "HISTORY"
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\fIDSA_sign()\fR and \fIDSA_verify()\fR are available in all versions of SSLeay.
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\fIDSA_sign_setup()\fR was added in SSLeay 0.8.
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.rn }` ''
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.IX Title "DSA_sign 3"
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.IX Name "DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures"
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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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