311 lines
7.3 KiB
Groff
311 lines
7.3 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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.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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.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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''' \*(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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'br\}
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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 DH_set_method 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 #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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.\}
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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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.\}
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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 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 th \o'bp'
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. ds Ae AE
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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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DH_set_default_method, DH_get_default_method, DH_set_method,
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DH_new_method, DH_OpenSSL \- select DH method
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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/dh.h>
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.Ve
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.Vb 1
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\& void DH_set_default_method(DH_METHOD *meth);
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.Ve
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.Vb 1
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\& DH_METHOD *DH_get_default_method(void);
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.Ve
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.Vb 1
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\& DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth);
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.Ve
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.Vb 1
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\& DH *DH_new_method(DH_METHOD *meth);
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.Ve
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.Vb 1
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\& DH_METHOD *DH_OpenSSL(void);
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.Ve
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.SH "DESCRIPTION"
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A \fBDH_METHOD\fR specifies the functions that OpenSSL uses for Diffie-Hellman
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operations. By modifying the method, alternative implementations
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such as hardware accelerators may be used.
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.PP
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Initially, the default is to use the OpenSSL internal implementation.
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\fIDH_OpenSSL()\fR returns a pointer to that method.
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.PP
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\fIDH_set_default_method()\fR makes \fBmeth\fR the default method for all \fBDH\fR
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structures created later.
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.PP
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\fIDH_get_default_method()\fR returns a pointer to the current default
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method.
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.PP
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\fIDH_set_method()\fR selects \fBmeth\fR for all operations using the structure \fBdh\fR.
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.PP
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\fIDH_get_method()\fR returns a pointer to the method currently selected
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for \fBdh\fR.
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.PP
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\fIDH_new_method()\fR allocates and initializes a \fBDH\fR structure so that
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\fBmethod\fR will be used for the DH operations. If \fBmethod\fR is \fBNULL\fR,
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the default method is used.
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.SH "THE DH_METHOD STRUCTURE"
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.PP
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.Vb 4
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\& typedef struct dh_meth_st
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\& {
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\& /* name of the implementation */
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\& const char *name;
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.Ve
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.Vb 2
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\& /* generate private and public DH values for key agreement */
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\& int (*generate_key)(DH *dh);
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.Ve
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.Vb 2
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\& /* compute shared secret */
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\& int (*compute_key)(unsigned char *key, BIGNUM *pub_key, DH *dh);
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.Ve
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.Vb 4
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\& /* compute r = a ^ p mod m (May be NULL for some implementations) */
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\& int (*bn_mod_exp)(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
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\& const BIGNUM *m, BN_CTX *ctx,
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\& BN_MONT_CTX *m_ctx);
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.Ve
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.Vb 2
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\& /* called at DH_new */
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\& int (*init)(DH *dh);
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.Ve
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.Vb 2
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\& /* called at DH_free */
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\& int (*finish)(DH *dh);
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.Ve
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.Vb 1
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\& int flags;
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.Ve
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.Vb 1
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\& char *app_data; /* ?? */
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.Ve
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.Vb 1
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\& } DH_METHOD;
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.Ve
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.SH "RETURN VALUES"
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\fIDH_OpenSSL()\fR, \fIDH_get_default_method()\fR and \fIDH_get_method()\fR return
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pointers to the respective \fBDH_METHOD\fRs.
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.PP
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\fIDH_set_default_method()\fR returns no value.
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.PP
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\fIDH_set_method()\fR returns a pointer to the \fBDH_METHOD\fR previously
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associated with \fBdh\fR.
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.PP
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\fIDH_new_method()\fR returns \fBNULL\fR and sets an error code that can be
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obtained by the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage if the allocation fails. Otherwise it
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returns a pointer to the newly allocated structure.
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.SH "SEE ALSO"
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the \fIdh(3)|dh(3)\fR manpage, the \fIDH_new(3)|DH_new(3)\fR manpage
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.SH "HISTORY"
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\fIDH_set_default_method()\fR, \fIDH_get_default_method()\fR, \fIDH_set_method()\fR,
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\fIDH_new_method()\fR and \fIDH_OpenSSL()\fR were added in OpenSSL 0.9.4.
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.rn }` ''
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.IX Title "DH_set_method 3"
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.IX Name "DH_set_default_method, DH_get_default_method, DH_set_method,
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DH_new_method, DH_OpenSSL - select DH method"
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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 "THE DH_METHOD STRUCTURE"
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.IX Header "RETURN VALUES"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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