376 lines
9.8 KiB
Groff
376 lines
9.8 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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.ie \\n(.$>=3 .ne \\$3
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.IP "\\$1" \\$2
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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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''' \*(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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'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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.nr % 0
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.rr F
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.\}
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.TH RSA_set_method 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 #F .3m
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.\}
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.if t \{\
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. ds #V .6m
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. ds #] \&
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.\}
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.if n \{\
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. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
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.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
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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 d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
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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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.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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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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RSA_set_default_method, RSA_get_default_method, RSA_set_method,
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RSA_get_method, RSA_PKCS1_SSLeay, RSA_PKCS1_RSAref,
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RSA_PKCS1_null_method, RSA_flags, RSA_new_method \- select RSA 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/rsa.h>
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.Ve
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.Vb 1
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\& void RSA_set_default_method(RSA_METHOD *meth);
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.Ve
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.Vb 1
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\& RSA_METHOD *RSA_get_default_method(void);
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.Ve
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.Vb 1
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\& RSA_METHOD *RSA_set_method(RSA *rsa, RSA_METHOD *meth);
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.Ve
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.Vb 1
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\& RSA_METHOD *RSA_get_method(RSA *rsa);
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.Ve
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.Vb 1
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\& RSA_METHOD *RSA_PKCS1_SSLeay(void);
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.Ve
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.Vb 1
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\& RSA_METHOD *RSA_PKCS1_RSAref(void);
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.Ve
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.Vb 1
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\& RSA_METHOD *RSA_null_method(void);
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.Ve
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.Vb 1
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\& int RSA_flags(RSA *rsa);
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.Ve
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.Vb 1
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\& RSA *RSA_new_method(RSA_METHOD *method);
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.Ve
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.SH "DESCRIPTION"
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An \fBRSA_METHOD\fR specifies the functions that OpenSSL uses for RSA
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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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unless OpenSSL was configured with the \f(CWrsaref\fR or \f(CW-DRSA_NULL\fR
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options. \fIRSA_PKCS1_SSLeay()\fR returns a pointer to that method.
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.PP
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\fIRSA_PKCS1_RSAref()\fR returns a pointer to a method that uses the RSAref
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library. This is the default method in the \f(CWrsaref\fR configuration;
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the function is not available in other configurations.
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\fIRSA_null_method()\fR returns a pointer to a method that does not support
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the RSA transformation. It is the default if OpenSSL is compiled with
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\f(CW-DRSA_NULL\fR. These methods may be useful in the USA because of a
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patent on the RSA cryptosystem.
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.PP
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\fIRSA_set_default_method()\fR makes \fBmeth\fR the default method for all \fBRSA\fR
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structures created later.
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.PP
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\fIRSA_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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\fIRSA_set_method()\fR selects \fBmeth\fR for all operations using the key
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\fBrsa\fR.
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.PP
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\fIRSA_get_method()\fR returns a pointer to the method currently selected
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for \fBrsa\fR.
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.PP
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\fIRSA_flags()\fR returns the \fBflags\fR that are set for \fBrsa\fR's current method.
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.PP
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\fIRSA_new_method()\fR allocates and initializes an \fBRSA\fR structure so that
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\fBmethod\fR will be used for the RSA operations. If \fBmethod\fR is \fBNULL\fR,
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the default method is used.
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.SH "THE RSA_METHOD STRUCTURE"
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.PP
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.Vb 4
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\& typedef struct rsa_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 3
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\& /* encrypt */
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\& int (*rsa_pub_enc)(int flen, unsigned char *from,
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\& unsigned char *to, RSA *rsa, int padding);
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.Ve
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.Vb 3
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\& /* verify arbitrary data */
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\& int (*rsa_pub_dec)(int flen, unsigned char *from,
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\& unsigned char *to, RSA *rsa, int padding);
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.Ve
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.Vb 3
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\& /* sign arbitrary data */
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\& int (*rsa_priv_enc)(int flen, unsigned char *from,
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\& unsigned char *to, RSA *rsa, int padding);
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.Ve
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.Vb 3
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\& /* decrypt */
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\& int (*rsa_priv_dec)(int flen, unsigned char *from,
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\& unsigned char *to, RSA *rsa, int padding);
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.Ve
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.Vb 3
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\& /* compute r0 = r0 ^ I mod rsa->n (May be NULL for some
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\& implementations) */
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\& int (*rsa_mod_exp)(BIGNUM *r0, BIGNUM *I, RSA *rsa);
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.Ve
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.Vb 3
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\& /* compute r = a ^ p mod m (May be NULL for some implementations) */
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\& int (*bn_mod_exp)(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
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\& const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
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.Ve
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.Vb 2
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\& /* called at RSA_new */
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\& int (*init)(RSA *rsa);
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.Ve
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.Vb 2
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\& /* called at RSA_free */
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\& int (*finish)(RSA *rsa);
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.Ve
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.Vb 7
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\& /* RSA_FLAG_EXT_PKEY - rsa_mod_exp is called for private key
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\& * operations, even if p,q,dmp1,dmq1,iqmp
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\& * are NULL
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\& * RSA_FLAG_SIGN_VER - enable rsa_sign and rsa_verify
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\& * RSA_METHOD_FLAG_NO_CHECK - don't check pub/private match
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\& */
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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 5
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\& /* sign. For backward compatibility, this is used only
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\& * if (flags & RSA_FLAG_SIGN_VER)
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\& */
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\& int (*rsa_sign)(int type, unsigned char *m, unsigned int m_len,
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\& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
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.Ve
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.Vb 5
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\& /* verify. For backward compatibility, this is used only
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\& * if (flags & RSA_FLAG_SIGN_VER)
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\& */
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\& int (*rsa_verify)(int type, unsigned char *m, unsigned int m_len,
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\& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
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.Ve
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.Vb 1
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\& } RSA_METHOD;
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.Ve
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.SH "RETURN VALUES"
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\fIRSA_PKCS1_SSLeay()\fR, \fIRSA_PKCS1_RSAref()\fR, \fIRSA_PKCS1_null_method()\fR,
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\fIRSA_get_default_method()\fR and \fIRSA_get_method()\fR return pointers to the
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respective \fBRSA_METHOD\fRs.
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.PP
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\fIRSA_set_default_method()\fR returns no value.
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.PP
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\fIRSA_set_method()\fR returns a pointer to the \fBRSA_METHOD\fR previously
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associated with \fBrsa\fR.
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.PP
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\fIRSA_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 \fIrsa(3)|rsa(3)\fR manpage, the \fIRSA_new(3)|RSA_new(3)\fR manpage
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.SH "HISTORY"
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\fIRSA_new_method()\fR and \fIRSA_set_default_method()\fR appeared in SSLeay 0.8.
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\fIRSA_get_default_method()\fR, \fIRSA_set_method()\fR and \fIRSA_get_method()\fR as
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well as the rsa_sign and rsa_verify components of RSA_METHOD were
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added in OpenSSL 0.9.4.
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.rn }` ''
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.IX Title "RSA_set_method 3"
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.IX Name "RSA_set_default_method, RSA_get_default_method, RSA_set_method,
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RSA_get_method, RSA_PKCS1_SSLeay, RSA_PKCS1_RSAref,
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RSA_PKCS1_null_method, RSA_flags, RSA_new_method - select RSA 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 RSA_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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