306 lines
9.1 KiB
Groff
306 lines
9.1 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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''' 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 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 blowfish 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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. 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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. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
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. ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m'
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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 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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blowfish, BF_set_key, BF_encrypt, BF_decrypt, BF_ecb_encrypt, BF_cbc_encrypt,
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BF_cfb64_encrypt, BF_ofb64_encrypt, BF_options \- Blowfish 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/blowfish.h>
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.Ve
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.Vb 1
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\& void BF_set_key(BF_KEY *key, int len, const unsigned char *data);
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.Ve
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.Vb 13
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\& void BF_encrypt(BF_LONG *data,const BF_KEY *key);
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\& void BF_decrypt(BF_LONG *data,const BF_KEY *key);
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\&
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\& void BF_ecb_encrypt(const unsigned char *in, unsigned char *out,
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\& BF_KEY *key, int enc);
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\& void BF_cbc_encrypt(const unsigned char *in, unsigned char *out,
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\& long length, BF_KEY *schedule, unsigned char *ivec, int enc);
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\& void BF_cfb64_encrypt(const unsigned char *in, unsigned char *out,
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\& long length, BF_KEY *schedule, unsigned char *ivec, int *num,
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\& int enc);
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\& void BF_ofb64_encrypt(const unsigned char *in, unsigned char *out,
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\& long length, BF_KEY *schedule, unsigned char *ivec, int *num);
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\& const char *BF_options(void);
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.Ve
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.SH "DESCRIPTION"
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This library implements the Blowfish cipher, which is invented and described
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by Counterpane (see http://www.counterpane.com/blowfish/ ).
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.PP
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Blowfish is a block cipher that operates on 64 bit (8 byte) blocks of data.
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It uses a variable size key, but typically, 128 bit (16 byte) keys are
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a considered good for strong encryption. Blowfish can be used in the same
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modes as DES (see the \fIdes_modes(7)|des_modes(7)\fR manpage). Blowfish is currently one
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of the faster block ciphers. It is quite a bit faster than DES, and much
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faster than IDEA or RC2.
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.PP
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Blowfish consists of a key setup phase and the actual encryption or decryption
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phase.
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.PP
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\fIBF_set_key()\fR sets up the \fBBF_KEY\fR \fBkey\fR using the \fBlen\fR bytes long key
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at \fBdata\fR.
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.PP
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\fIBF_encrypt()\fR and \fIBF_decrypt()\fR are the lowest level functions for Blowfish
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encryption. They encrypt/decrypt the first 64 bits of the vector pointed by
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\fBdata\fR, using the key \fBkey\fR. These functions should not be used unless you
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implement \*(L'modes\*(R' of Blowfish.
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.PP
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\fIBF_ecb_encrypt()\fR is the basic Blowfish encryption and decryption function.
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It encrypts or decrypts the first 64 bits of \fBin\fR using the key \fBkey\fR,
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putting the result in \fBout\fR. \fBenc\fR decides if encryption (\fBBF_ENCRYPT\fR)
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or decryption (\fBBF_DECRYPT\fR) shall be performed. The vector pointed at by
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\fBin\fR and \fBout\fR must be 64 bits in length, no less. If they are larger,
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everything after the first 64 bits is ignored.
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.PP
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The mode functions \fIBF_cbc_encrypt()\fR, \fIBF_cfb64_encrypt()\fR and \fIBF_ofb64_encrypt()\fR
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all operate on variable length data. They all take an initialisation vector
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\fBivec\fR which needs to be passed along into the next call of the same function
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for the same message. \fBivec\fR may be initialised with anything, but the
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recipient needs to know what it was initialised with, or it won't be able
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to decrypt. Some programs and protocols simplify this, like SSH, where
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\fBivec\fR is simply initialised to zero.
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\fIBF_cbc_encrypt()\fR operates of data that is a multiple of 8 bytes long, while
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\fIBF_cfb64_encrypt()\fR and \fIBF_ofb64_encrypt()\fR are used to encrypt an variable
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number of bytes (the amount does not have to be an exact multiple of 8). The
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purpose of the latter two is to simulate stream ciphers, and therefore, they
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need the parameter \fBnum\fR, which is a pointer to an integer where the current
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offset in \fBivec\fR is stored between calls. This integer must be initialised
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to zero when \fBivec\fR is initialised.
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.PP
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\fIBF_cbc_encrypt()\fR is the Cipher Block Chaining function for Blowfish. It
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encrypts or decrypts the 64 bits chunks of \fBin\fR using the key \fBschedule\fR,
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putting the result in \fBout\fR. \fBenc\fR decides if encryption (BF_ENCRYPT) or
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decryption (BF_DECRYPT) shall be performed. \fBivec\fR must point at an 8 byte
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long initialisation vector.
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.PP
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\fIBF_cfb64_encrypt()\fR is the CFB mode for Blowfish with 64 bit feedback.
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It encrypts or decrypts the bytes in \fBin\fR using the key \fBschedule\fR,
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putting the result in \fBout\fR. \fBenc\fR decides if encryption (\fBBF_ENCRYPT\fR)
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or decryption (\fBBF_DECRYPT\fR) shall be performed. \fBivec\fR must point at an
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8 byte long initialisation vector. \fBnum\fR must point at an integer which must
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be initially zero.
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.PP
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\fIBF_ofb64_encrypt()\fR is the OFB mode for Blowfish with 64 bit feedback.
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It uses the same parameters as \fIBF_cfb64_encrypt()\fR, which must be initialised
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the same way.
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.SH "RETURN VALUES"
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None of the functions presented here return any value.
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.SH "NOTE"
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Applications should use the higher level functions
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the \fIEVP_EncryptInit(3)|EVP_EncryptInit(3)\fR manpage etc. instead of calling the
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blowfish functions directly.
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.SH "SEE ALSO"
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the \fIdes_modes(7)|des_modes(7)\fR manpage
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.SH "HISTORY"
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The Blowfish functions are available in all versions of SSLeay and OpenSSL.
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.rn }` ''
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.IX Title "blowfish 3"
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.IX Name "blowfish, BF_set_key, BF_encrypt, BF_decrypt, BF_ecb_encrypt, BF_cbc_encrypt,
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BF_cfb64_encrypt, BF_ofb64_encrypt, BF_options - Blowfish 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 "NOTE"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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