267 lines
6.8 KiB
Groff
267 lines
6.8 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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.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 T" """""
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.ds L' '
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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 T" ''
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.ds L' `
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.ds M' `
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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 EVP_SealInit 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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. 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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.\}
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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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.\}
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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 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_SealInit, EVP_SealUpdate, EVP_SealFinal \- EVP envelope encryption
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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 6
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\& int EVP_SealInit(EVP_CIPHER_CTX *ctx, EVP_CIPHER *type, unsigned char **ek,
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\& int *ekl, unsigned char *iv,EVP_PKEY **pubk, int npubk);
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\& void EVP_SealUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
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\& int *outl, unsigned char *in, int inl);
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\& void EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
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\& int *outl);
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.Ve
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.SH "DESCRIPTION"
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The EVP envelope routines are a high level interface to envelope
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encryption. They generate a random key and then \*(L"envelope\*(R" it by
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using public key encryption. Data can then be encrypted using this
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key.
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.PP
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\fIEVP_SealInit()\fR initialises a cipher context \fBctx\fR for encryption
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with cipher \fBtype\fR using a random secret key and IV supplied in
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the \fBiv\fR parameter. \fBtype\fR is normally supplied by a function such
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as \fIEVP_des_cbc()\fR. The secret key is encrypted using one or more public
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keys, this allows the same encrypted data to be decrypted using any
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of the corresponding private keys. \fBek\fR is an array of buffers where
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the public key encrypted secret key will be written, each buffer must
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contain enough room for the corresponding encrypted key: that is
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\fBek[i]\fR must have room for \fBEVP_PKEY_size(pubk[i])\fR bytes. The actual
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size of each encrypted secret key is written to the array \fBekl\fR. \fBpubk\fR is
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an array of \fBnpubk\fR public keys.
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.PP
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\fIEVP_SealUpdate()\fR and \fIEVP_SealFinal()\fR have exactly the same properties
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as the \fIEVP_EncryptUpdate()\fR and \fIEVP_EncryptFinal()\fR routines, as
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documented on the the \fIEVP_EncryptInit(3)|EVP_EncryptInit(3)\fR manpage manual
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page.
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.SH "RETURN VALUES"
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\fIEVP_SealInit()\fR returns \-1 on error or \fBnpubk\fR if successful.
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.PP
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\fIEVP_SealUpdate()\fR and \fIEVP_SealFinal()\fR do not return values.
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.SH "NOTES"
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Because a random secret key is generated the random number generator
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must be seeded before calling \fIEVP_SealInit()\fR.
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.PP
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The public key must be RSA because it is the only OpenSSL public key
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algorithm that supports key transport.
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.PP
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Envelope encryption is the usual method of using public key encryption
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on large amounts of data, this is because public key encryption is slow
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but symmetric encryption is fast. So symmetric encryption is used for
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bulk encryption and the small random symmetric key used is transferred
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using public key encryption.
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.SH "SEE ALSO"
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the \fIevp(3)|evp(3)\fR,the section on \fIrand(3)|rand(3)\fR manpage
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the \fIEVP_EncryptInit(3)|EVP_EncryptInit(3)\fR manpage,
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the \fIEVP_OpenInit(3)|EVP_OpenInit(3)\fR manpage
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.SH "HISTORY"
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.rn }` ''
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.IX Title "EVP_SealInit 3"
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.IX Name "EVP_SealInit, EVP_SealUpdate, EVP_SealFinal - EVP envelope encryption"
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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 "SEE ALSO"
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.IX Header "HISTORY"
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