.rn '' }` ''' $RCSfile$$Revision$$Date$ ''' ''' $Log$ ''' .de Sh .br .if t .Sp .ne 5 .PP \fB\\$1\fR .PP .. .de Sp .if t .sp .5v .if n .sp .. .de Ip .br .ie \\n(.$>=3 .ne \\$3 .el .ne 3 .IP "\\$1" \\$2 .. .de Vb .ft CW .nf .ne \\$1 .. .de Ve .ft R .fi .. ''' ''' ''' Set up \*(-- to give an unbreakable dash; ''' string Tr holds user defined translation string. ''' Bell System Logo is used as a dummy character. ''' .tr \(*W-|\(bv\*(Tr .ie n \{\ .ds -- \(*W- .ds PI pi .if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch .if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch .ds L" "" .ds R" "" ''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of ''' \*(L" and \*(R", except that they are used on ".xx" lines, ''' such as .IP and .SH, which do another additional levels of ''' double-quote interpretation .ds M" """ .ds S" """ .ds N" """"" .ds T" """"" .ds L' ' .ds R' ' .ds M' ' .ds S' ' .ds N' ' .ds T' ' 'br\} .el\{\ .ds -- \(em\| .tr \*(Tr .ds L" `` .ds R" '' .ds M" `` .ds S" '' .ds N" `` .ds T" '' .ds L' ` .ds R' ' .ds M' ` .ds S' ' .ds N' ` .ds T' ' .ds PI \(*p 'br\} .\" If the F register is turned on, we'll generate .\" index entries out stderr for the following things: .\" TH Title .\" SH Header .\" Sh Subsection .\" Ip Item .\" X<> Xref (embedded .\" Of course, you have to process the output yourself .\" in some meaninful fashion. .if \nF \{ .de IX .tm Index:\\$1\t\\n%\t"\\$2" .. .nr % 0 .rr F .\} .TH DSA_set_method 3 "0.9.7d" "2/Sep/2004" "OpenSSL" .UC .if n .hy 0 .if n .na .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .de CQ \" put $1 in typewriter font .ft CW 'if n "\c 'if t \\&\\$1\c 'if n \\&\\$1\c 'if n \&" \\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7 '.ft R .. .\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2 . \" AM - accent mark definitions .bd B 3 . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds ? ? . ds ! ! . ds / . ds q .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10' . ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' . 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' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds v \\k:\h'-(\\n(.wu*9/10-\*(#H)'\v'-\*(#V'\*(#[\s-4v\s0\v'\*(#V'\h'|\\n:u'\*(#] .ds _ \\k:\h'-(\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\n:u' .ds . \\k:\h'-(\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\n:u' .ds 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#] .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E .ds oe o\h'-(\w'o'u*4/10)'e .ds Oe O\h'-(\w'O'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds v \h'-1'\o'\(aa\(ga' . ds _ \h'-1'^ . ds . \h'-1'. . ds 3 3 . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE . ds oe oe . ds Oe OE .\} .rm #[ #] #H #V #F C .SH "NAME" DSA_set_default_method, DSA_get_default_method, DSA_set_method, DSA_new_method, DSA_OpenSSL \- select DSA method .SH "SYNOPSIS" .PP .Vb 2 \& #include \& #include .Ve .Vb 1 \& void DSA_set_default_method(const DSA_METHOD *meth); .Ve .Vb 1 \& const DSA_METHOD *DSA_get_default_method(void); .Ve .Vb 1 \& int DSA_set_method(DSA *dsa, const DSA_METHOD *meth); .Ve .Vb 1 \& DSA *DSA_new_method(ENGINE *engine); .Ve .Vb 1 \& DSA_METHOD *DSA_OpenSSL(void); .Ve .SH "DESCRIPTION" A \fBDSA_METHOD\fR specifies the functions that OpenSSL uses for DSA operations. By modifying the method, alternative implementations such as hardware accelerators may be used. IMPORTANT: See the NOTES section for important information about how these DSA API functions are affected by the use of \fBENGINE\fR API calls. .PP Initially, the default DSA_METHOD is the OpenSSL internal implementation, as returned by \fIDSA_OpenSSL()\fR. .PP \fIDSA_set_default_method()\fR makes \fBmeth\fR the default method for all DSA structures created later. \fBNB\fR: This is true only whilst no ENGINE has been set as a default for DSA, so this function is no longer recommended. .PP \fIDSA_get_default_method()\fR returns a pointer to the current default DSA_METHOD. However, the meaningfulness of this result is dependant on whether the ENGINE API is being used, so this function is no longer recommended. .PP \fIDSA_set_method()\fR selects \fBmeth\fR to perform all operations using the key \fBrsa\fR. This will replace the DSA_METHOD used by the DSA key and if the previous method was supplied by an ENGINE, the handle to that ENGINE will be released during the change. It is possible to have DSA keys that only work with certain DSA_METHOD implementations (eg. from an ENGINE module that supports embedded hardware-protected keys), and in such cases attempting to change the DSA_METHOD for the key can have unexpected results. .PP \fIDSA_new_method()\fR allocates and initializes a DSA structure so that \fBengine\fR will be used for the DSA operations. If \fBengine\fR is NULL, the default engine for DSA operations is used, and if no default ENGINE is set, the DSA_METHOD controlled by \fIDSA_set_default_method()\fR is used. .SH "THE DSA_METHOD STRUCTURE" struct { /* name of the implementation */ const char *name; .PP .Vb 3 \& /* sign */ \& DSA_SIG *(*dsa_do_sign)(const unsigned char *dgst, int dlen, \& DSA *dsa); .Ve .Vb 3 \& /* pre-compute k^-1 and r */ \& int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, \& BIGNUM **rp); .Ve .Vb 3 \& /* verify */ \& int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len, \& DSA_SIG *sig, DSA *dsa); .Ve .Vb 5 \& /* compute rr = a1^p1 * a2^p2 mod m (May be NULL for some \& implementations) */ \& int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, \& BIGNUM *a2, BIGNUM *p2, BIGNUM *m, \& BN_CTX *ctx, BN_MONT_CTX *in_mont); .Ve .Vb 4 \& /* compute r = a ^ p mod m (May be NULL for some implementations) */ \& int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, \& const BIGNUM *p, const BIGNUM *m, \& BN_CTX *ctx, BN_MONT_CTX *m_ctx); .Ve .Vb 2 \& /* called at DSA_new */ \& int (*init)(DSA *DSA); .Ve .Vb 2 \& /* called at DSA_free */ \& int (*finish)(DSA *DSA); .Ve .Vb 1 \& int flags; .Ve .Vb 1 \& char *app_data; /* ?? */ .Ve .Vb 1 \& } DSA_METHOD; .Ve .SH "RETURN VALUES" \fIDSA_OpenSSL()\fR and \fIDSA_get_default_method()\fR return pointers to the respective \fBDSA_METHOD\fRs. .PP \fIDSA_set_default_method()\fR returns no value. .PP \fIDSA_set_method()\fR returns non-zero if the provided \fBmeth\fR was successfully set as the method for \fBdsa\fR (including unloading the ENGINE handle if the previous method was supplied by an ENGINE). .PP \fIDSA_new_method()\fR returns NULL and sets an error code that can be obtained by ERR_get_error(3) if the allocation fails. Otherwise it returns a pointer to the newly allocated structure. .SH "NOTES" As of version 0.9.7, DSA_METHOD implementations are grouped together with other algorithmic APIs (eg. RSA_METHOD, EVP_CIPHER, etc) in \fBENGINE\fR modules. If a default ENGINE is specified for DSA functionality using an ENGINE API function, that will override any DSA defaults set using the DSA API (ie. \fIDSA_set_default_method()\fR). For this reason, the ENGINE API is the recommended way to control default implementations for use in DSA and other cryptographic algorithms. .SH "SEE ALSO" dsa(3), DSA_new(3) .SH "HISTORY" \fIDSA_set_default_method()\fR, \fIDSA_get_default_method()\fR, \fIDSA_set_method()\fR, \fIDSA_new_method()\fR and \fIDSA_OpenSSL()\fR were added in OpenSSL 0.9.4. .PP \fIDSA_set_default_openssl_method()\fR and \fIDSA_get_default_openssl_method()\fR replaced \fIDSA_set_default_method()\fR and \fIDSA_get_default_method()\fR respectively, and \fIDSA_set_method()\fR and \fIDSA_new_method()\fR were altered to use \fBENGINE\fRs rather than \fBDSA_METHOD\fRs during development of the engine version of OpenSSL 0.9.6. For 0.9.7, the handling of defaults in the ENGINE API was restructured so that this change was reversed, and behaviour of the other functions resembled more closely the previous behaviour. The behaviour of defaults in the ENGINE API now transparently overrides the behaviour of defaults in the DSA API without requiring changing these function prototypes. .rn }` '' .IX Title "DSA_set_method 3" .IX Name "DSA_set_default_method, DSA_get_default_method, DSA_set_method, DSA_new_method, DSA_OpenSSL - select DSA method" .IX Header "NAME" .IX Header "SYNOPSIS" .IX Header "DESCRIPTION" .IX Header "THE DSA_METHOD STRUCTURE" .IX Header "RETURN VALUES" .IX Header "NOTES" .IX Header "SEE ALSO" .IX Header "HISTORY"