22

✏️ Editing: RSA_meth_get_verify.3

.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" Set up some character translations and predefined strings.  \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote.  \*(C+ will
.\" give a nicer C++.  Capital omega is used to do unbreakable dashes and
.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
.\" nothing in troff, for use with C<>.
.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.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" ""
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds -- \|\(em\|
.    ds PI \(*p
.    ds L" ``
.    ds R" ''
.    ds C`
.    ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
.    if \nF \{\
.        de IX
.        tm Index:\\$1\t\\n%\t"\\$2"
..
.        if !\nF==2 \{\
.            nr % 0
.            nr F 2
.        \}
.    \}
.\}
.rr rF
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
.    \" 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 /
.\}
.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 / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
.    \" 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 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
.    \" 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 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
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "RSA_METH_NEW 3"
.TH RSA_METH_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
RSA_meth_get0_app_data, RSA_meth_set0_app_data, RSA_meth_new, RSA_meth_free, RSA_meth_dup, RSA_meth_get0_name, RSA_meth_set1_name, RSA_meth_get_flags, RSA_meth_set_flags, RSA_meth_get_pub_enc, RSA_meth_set_pub_enc, RSA_meth_get_pub_dec, RSA_meth_set_pub_dec, RSA_meth_get_priv_enc, RSA_meth_set_priv_enc, RSA_meth_get_priv_dec, RSA_meth_set_priv_dec, RSA_meth_get_mod_exp, RSA_meth_set_mod_exp, RSA_meth_get_bn_mod_exp, RSA_meth_set_bn_mod_exp, RSA_meth_get_init, RSA_meth_set_init, RSA_meth_get_finish, RSA_meth_set_finish, RSA_meth_get_sign, RSA_meth_set_sign, RSA_meth_get_verify, RSA_meth_set_verify, RSA_meth_get_keygen, RSA_meth_set_keygen, RSA_meth_get_multi_prime_keygen, RSA_meth_set_multi_prime_keygen \&\- Routines to build up RSA methods
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/rsa.h>
\&
\& RSA_METHOD *RSA_meth_new(const char *name, int flags);
\& void RSA_meth_free(RSA_METHOD *meth);
\&
\& RSA_METHOD *RSA_meth_dup(const RSA_METHOD *meth);
\&
\& const char *RSA_meth_get0_name(const RSA_METHOD *meth);
\& int RSA_meth_set1_name(RSA_METHOD *meth, const char *name);
\&
\& int RSA_meth_get_flags(const RSA_METHOD *meth);
\& int RSA_meth_set_flags(RSA_METHOD *meth, int flags);
\&
\& void *RSA_meth_get0_app_data(const RSA_METHOD *meth);
\& int RSA_meth_set0_app_data(RSA_METHOD *meth, void *app_data);
\&
\& int (*RSA_meth_get_pub_enc(const RSA_METHOD *meth))(int flen, const unsigned char *from,
\&                                                     unsigned char *to, RSA *rsa, int padding);
\& int RSA_meth_set_pub_enc(RSA_METHOD *rsa,
\&                          int (*pub_enc)(int flen, const unsigned char *from,
\&                                         unsigned char *to, RSA *rsa,
\&                                         int padding));
\&
\& int (*RSA_meth_get_pub_dec(const RSA_METHOD *meth))
\&     (int flen, const unsigned char *from,
\&      unsigned char *to, RSA *rsa, int padding);
\& int RSA_meth_set_pub_dec(RSA_METHOD *rsa,
\&                          int (*pub_dec)(int flen, const unsigned char *from,
\&                                         unsigned char *to, RSA *rsa,
\&                                         int padding));
\&
\& int (*RSA_meth_get_priv_enc(const RSA_METHOD *meth))(int flen, const unsigned char *from,
\&                                                      unsigned char *to, RSA *rsa,
\&                                                      int padding);
\& int RSA_meth_set_priv_enc(RSA_METHOD *rsa,
\&                           int (*priv_enc)(int flen, const unsigned char *from,
\&                                           unsigned char *to, RSA *rsa, int padding));
\&
\& int (*RSA_meth_get_priv_dec(const RSA_METHOD *meth))(int flen, const unsigned char *from,
\&                                                      unsigned char *to, RSA *rsa,
\&                                                      int padding);
\& int RSA_meth_set_priv_dec(RSA_METHOD *rsa,
\&                           int (*priv_dec)(int flen, const unsigned char *from,
\&                                           unsigned char *to, RSA *rsa, int padding));
\&
\& /* Can be null */
\& int (*RSA_meth_get_mod_exp(const RSA_METHOD *meth))(BIGNUM *r0, const BIGNUM *i,
\&                                                     RSA *rsa, BN_CTX *ctx);
\& int RSA_meth_set_mod_exp(RSA_METHOD *rsa,
\&                          int (*mod_exp)(BIGNUM *r0, const BIGNUM *i, RSA *rsa,
\&                                         BN_CTX *ctx));
\&
\& /* Can be null */
\& int (*RSA_meth_get_bn_mod_exp(const RSA_METHOD *meth))(BIGNUM *r, const BIGNUM *a,
\&                                                        const BIGNUM *p, const BIGNUM *m,
\&                                                        BN_CTX *ctx, BN_MONT_CTX *m_ctx);
\& int RSA_meth_set_bn_mod_exp(RSA_METHOD *rsa,
\&                             int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a,
\&                                               const BIGNUM *p, const BIGNUM *m,
\&                                               BN_CTX *ctx, BN_MONT_CTX *m_ctx));
\&
\& /* called at new */
\& int (*RSA_meth_get_init(const RSA_METHOD *meth) (RSA *rsa);
\& int RSA_meth_set_init(RSA_METHOD *rsa, int (*init (RSA *rsa));
\&
\& /* called at free */
\& int (*RSA_meth_get_finish(const RSA_METHOD *meth))(RSA *rsa);
\& int RSA_meth_set_finish(RSA_METHOD *rsa, int (*finish)(RSA *rsa));
\&
\& int (*RSA_meth_get_sign(const RSA_METHOD *meth))(int type, const unsigned char *m,
\&                                                  unsigned int m_length,
\&                                                  unsigned char *sigret,
\&                                                  unsigned int *siglen, const RSA *rsa);
\& int RSA_meth_set_sign(RSA_METHOD *rsa,
\&                       int (*sign)(int type, const unsigned char *m,
\&                                   unsigned int m_length, unsigned char *sigret,
\&                                   unsigned int *siglen, const RSA *rsa));
\&
\& int (*RSA_meth_get_verify(const RSA_METHOD *meth))(int dtype, const unsigned char *m,
\&                                                    unsigned int m_length,
\&                                                    const unsigned char *sigbuf,
\&                                                    unsigned int siglen, const RSA *rsa);
\& int RSA_meth_set_verify(RSA_METHOD *rsa,
\&                         int (*verify)(int dtype, const unsigned char *m,
\&                                       unsigned int m_length,
\&                                       const unsigned char *sigbuf,
\&                                       unsigned int siglen, const RSA *rsa));
\&
\& int (*RSA_meth_get_keygen(const RSA_METHOD *meth))(RSA *rsa, int bits, BIGNUM *e,
\&                                                    BN_GENCB *cb);
\& int RSA_meth_set_keygen(RSA_METHOD *rsa,
\&                         int (*keygen)(RSA *rsa, int bits, BIGNUM *e,
\&                                       BN_GENCB *cb));
\&
\& int (*RSA_meth_get_multi_prime_keygen(const RSA_METHOD *meth))(RSA *rsa, int bits,
\&                                                                int primes, BIGNUM *e,
\&                                                                BN_GENCB *cb);
\&
\& int RSA_meth_set_multi_prime_keygen(RSA_METHOD *meth,
\&                                     int (*keygen) (RSA *rsa, int bits,
\&                                                    int primes, BIGNUM *e,
\&                                                    BN_GENCB *cb));
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fB\s-1RSA_METHOD\s0\fR type is a structure used for the provision of custom
\&\s-1RSA\s0 implementations. It provides a set of functions used by OpenSSL
for the implementation of the various \s-1RSA\s0 capabilities. See the rsa
page for more information.
.PP
\&\fBRSA_meth_new()\fR creates a new \fB\s-1RSA_METHOD\s0\fR structure. It should be
given a unique \fBname\fR and a set of \fBflags\fR. The \fBname\fR should be a
\&\s-1NULL\s0 terminated string, which will be duplicated and stored in the
\&\fB\s-1RSA_METHOD\s0\fR object. It is the callers responsibility to free the
original string. The flags will be used during the construction of a
new \fB\s-1RSA\s0\fR object based on this \fB\s-1RSA_METHOD\s0\fR. Any new \fB\s-1RSA\s0\fR object
will have those flags set by default.
.PP
\&\fBRSA_meth_dup()\fR creates a duplicate copy of the \fB\s-1RSA_METHOD\s0\fR object
passed as a parameter. This might be useful for creating a new
\&\fB\s-1RSA_METHOD\s0\fR based on an existing one, but with some differences.
.PP
\&\fBRSA_meth_free()\fR destroys an \fB\s-1RSA_METHOD\s0\fR structure and frees up any
memory associated with it.
.PP
\&\fBRSA_meth_get0_name()\fR will return a pointer to the name of this
\&\s-1RSA_METHOD.\s0 This is a pointer to the internal name string and so
should not be freed by the caller. \fBRSA_meth_set1_name()\fR sets the name
of the \s-1RSA_METHOD\s0 to \fBname\fR. The string is duplicated and the copy is
stored in the \s-1RSA_METHOD\s0 structure, so the caller remains responsible
for freeing the memory associated with the name.
.PP
\&\fBRSA_meth_get_flags()\fR returns the current value of the flags associated
with this \s-1RSA_METHOD.\s0 \fBRSA_meth_set_flags()\fR provides the ability to set
these flags.
.PP
The functions \fBRSA_meth_get0_app_data()\fR and \fBRSA_meth_set0_app_data()\fR
provide the ability to associate implementation specific data with the
\&\s-1RSA_METHOD.\s0 It is the application's responsibility to free this data
before the \s-1RSA_METHOD\s0 is freed via a call to \fBRSA_meth_free()\fR.
.PP
\&\fBRSA_meth_get_sign()\fR and \fBRSA_meth_set_sign()\fR get and set the function
used for creating an \s-1RSA\s0 signature respectively. This function will be
called in response to the application calling \fBRSA_sign()\fR. The
parameters for the function have the same meaning as for \fBRSA_sign()\fR.
.PP
\&\fBRSA_meth_get_verify()\fR and \fBRSA_meth_set_verify()\fR get and set the
function used for verifying an \s-1RSA\s0 signature respectively. This
function will be called in response to the application calling
\&\fBRSA_verify()\fR. The parameters for the function have the same meaning as
for \fBRSA_verify()\fR.
.PP
\&\fBRSA_meth_get_mod_exp()\fR and \fBRSA_meth_set_mod_exp()\fR get and set the
function used for \s-1CRT\s0 computations.
.PP
\&\fBRSA_meth_get_bn_mod_exp()\fR and \fBRSA_meth_set_bn_mod_exp()\fR get and set
the function used for \s-1CRT\s0 computations, specifically the following
value:
.PP
.Vb 1
\& r = a ^ p mod m
.Ve
.PP
Both the \fBmod_exp()\fR and \fBbn_mod_exp()\fR functions are called by the
default OpenSSL method during encryption, decryption, signing and
verification.
.PP
\&\fBRSA_meth_get_init()\fR and \fBRSA_meth_set_init()\fR get and set the function
used for creating a new \s-1RSA\s0 instance respectively. This function will
be called in response to the application calling \fBRSA_new()\fR (if the
current default \s-1RSA_METHOD\s0 is this one) or \fBRSA_new_method()\fR. The
\&\fBRSA_new()\fR and \fBRSA_new_method()\fR functions will allocate the memory for
the new \s-1RSA\s0 object, and a pointer to this newly allocated structure
will be passed as a parameter to the function. This function may be
\&\s-1NULL.\s0
.PP
\&\fBRSA_meth_get_finish()\fR and \fBRSA_meth_set_finish()\fR get and set the
function used for destroying an instance of an \s-1RSA\s0 object respectively.
This function will be called in response to the application calling
\&\fBRSA_free()\fR. A pointer to the \s-1RSA\s0 to be destroyed is passed as a
parameter. The destroy function should be used for \s-1RSA\s0 implementation
specific clean up. The memory for the \s-1RSA\s0 itself should not be freed
by this function. This function may be \s-1NULL.\s0
.PP
\&\fBRSA_meth_get_keygen()\fR and \fBRSA_meth_set_keygen()\fR get and set the
function used for generating a new \s-1RSA\s0 key pair respectively. This
function will be called in response to the application calling
\&\fBRSA_generate_key_ex()\fR. The parameter for the function has the same
meaning as for \fBRSA_generate_key_ex()\fR.
.PP
\&\fBRSA_meth_get_multi_prime_keygen()\fR and \fBRSA_meth_set_multi_prime_keygen()\fR get
and set the function used for generating a new multi-prime \s-1RSA\s0 key pair
respectively. This function will be called in response to the application calling
\&\fBRSA_generate_multi_prime_key()\fR. The parameter for the function has the same
meaning as for \fBRSA_generate_multi_prime_key()\fR.
.PP
\&\fBRSA_meth_get_pub_enc()\fR, \fBRSA_meth_set_pub_enc()\fR,
\&\fBRSA_meth_get_pub_dec()\fR, \fBRSA_meth_set_pub_dec()\fR,
\&\fBRSA_meth_get_priv_enc()\fR, \fBRSA_meth_set_priv_enc()\fR,
\&\fBRSA_meth_get_priv_dec()\fR, \fBRSA_meth_set_priv_dec()\fR get and set the
functions used for public and private key encryption and decryption.
These functions will be called in response to the application calling
\&\fBRSA_public_encrypt()\fR, \fBRSA_private_decrypt()\fR, \fBRSA_private_encrypt()\fR and
\&\fBRSA_public_decrypt()\fR and take the same parameters as those.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBRSA_meth_new()\fR and \fBRSA_meth_dup()\fR return the newly allocated
\&\s-1RSA_METHOD\s0 object or \s-1NULL\s0 on failure.
.PP
\&\fBRSA_meth_get0_name()\fR and \fBRSA_meth_get_flags()\fR return the name and
flags associated with the \s-1RSA_METHOD\s0 respectively.
.PP
All other RSA_meth_get_*() functions return the appropriate function
pointer that has been set in the \s-1RSA_METHOD,\s0 or \s-1NULL\s0 if no such
pointer has yet been set.
.PP
RSA_meth_set1_name and all RSA_meth_set_*() functions return 1 on
success or 0 on failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBRSA_new\fR\|(3), \fBRSA_generate_key_ex\fR\|(3), \fBRSA_sign\fR\|(3),
\&\fBRSA_set_method\fR\|(3), \fBRSA_size\fR\|(3), \fBRSA_get0_key\fR\|(3),
\&\fBRSA_generate_multi_prime_key\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBRSA_meth_get_multi_prime_keygen()\fR and \fBRSA_meth_set_multi_prime_keygen()\fR were
added in OpenSSL 1.1.1.
.PP
Other functions described here were added in OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

MR SKB