[thirdparty/openssl.git] / doc / man3 / RSA_meth_new.pod

=pod

=head1 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

=head1 SYNOPSIS

 #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));

=head1 DESCRIPTION

The B<RSA_METHOD> type is a structure used for the provision of custom
RSA implementations. It provides a set of functions used by OpenSSL
for the implementation of the various RSA capabilities.

RSA_meth_new() creates a new B<RSA_METHOD> structure. It should be
given a unique B<name> and a set of B<flags>. The B<name> should be a
NULL terminated string, which will be duplicated and stored in the
B<RSA_METHOD> object. It is the callers responsibility to free the
original string. The flags will be used during the construction of a
new B<RSA> object based on this B<RSA_METHOD>. Any new B<RSA> object
will have those flags set by default.

RSA_meth_dup() creates a duplicate copy of the B<RSA_METHOD> object
passed as a parameter. This might be useful for creating a new
B<RSA_METHOD> based on an existing one, but with some differences.

RSA_meth_free() destroys an B<RSA_METHOD> structure and frees up any
memory associated with it.

RSA_meth_get0_name() will return a pointer to the name of this
RSA_METHOD. This is a pointer to the internal name string and so
should not be freed by the caller. RSA_meth_set1_name() sets the name
of the RSA_METHOD to B<name>. The string is duplicated and the copy is
stored in the RSA_METHOD structure, so the caller remains responsible
for freeing the memory associated with the name.

RSA_meth_get_flags() returns the current value of the flags associated
with this RSA_METHOD. RSA_meth_set_flags() provides the ability to set
these flags.

The functions RSA_meth_get0_app_data() and RSA_meth_set0_app_data()
provide the ability to associate implementation specific data with the
RSA_METHOD. It is the application's responsibility to free this data
before the RSA_METHOD is freed via a call to RSA_meth_free().

RSA_meth_get_sign() and RSA_meth_set_sign() get and set the function
used for creating an RSA signature respectively. This function will be
called in response to the application calling RSA_sign(). The
parameters for the function have the same meaning as for RSA_sign().

RSA_meth_get_verify() and RSA_meth_set_verify() get and set the
function used for verifying an RSA signature respectively. This
function will be called in response to the application calling
RSA_verify(). The parameters for the function have the same meaning as
for RSA_verify().

RSA_meth_get_mod_exp() and RSA_meth_set_mod_exp() get and set the
function used for CRT computations.

RSA_meth_get_bn_mod_exp() and RSA_meth_set_bn_mod_exp() get and set
the function used for CRT computations, specifically the following
value:

 r = a ^ p mod m

Both the mod_exp() and bn_mod_exp() functions are called by the
default OpenSSL method during encryption, decryption, signing and
verification.

RSA_meth_get_init() and RSA_meth_set_init() get and set the function
used for creating a new RSA instance respectively. This function will
be called in response to the application calling RSA_new() (if the
current default RSA_METHOD is this one) or RSA_new_method(). The
RSA_new() and RSA_new_method() functions will allocate the memory for
the new RSA object, and a pointer to this newly allocated structure
will be passed as a parameter to the function. This function may be
NULL.

RSA_meth_get_finish() and RSA_meth_set_finish() get and set the
function used for destroying an instance of an RSA object respectively.
This function will be called in response to the application calling
RSA_free(). A pointer to the RSA to be destroyed is passed as a
parameter. The destroy function should be used for RSA implementation
specific clean up. The memory for the RSA itself should not be freed
by this function. This function may be NULL.

RSA_meth_get_keygen() and RSA_meth_set_keygen() get and set the
function used for generating a new RSA key pair respectively. This
function will be called in response to the application calling
RSA_generate_key_ex(). The parameter for the function has the same
meaning as for RSA_generate_key_ex().

RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() get
and set the function used for generating a new multi-prime RSA key pair
respectively. This function will be called in response to the application calling
RSA_generate_multi_prime_key(). The parameter for the function has the same
meaning as for RSA_generate_multi_prime_key().

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() 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
RSA_public_encrypt(), RSA_private_decrypt(), RSA_private_encrypt() and
RSA_public_decrypt() and take the same parameters as those.


=head1 RETURN VALUES

RSA_meth_new() and RSA_meth_dup() return the newly allocated
RSA_METHOD object or NULL on failure.

RSA_meth_get0_name() and RSA_meth_get_flags() return the name and
flags associated with the RSA_METHOD respectively.

All other RSA_meth_get_*() functions return the appropriate function
pointer that has been set in the RSA_METHOD, or NULL if no such
pointer has yet been set.

RSA_meth_set1_name and all RSA_meth_set_*() functions return 1 on
success or 0 on failure.

=head1 SEE ALSO

L<RSA_new(3)>, L<RSA_generate_key_ex(3)>, L<RSA_sign(3)>,
L<RSA_set_method(3)>, L<RSA_size(3)>, L<RSA_get0_key(3)>,
L<RSA_generate_multi_prime_key(3)>

=head1 HISTORY

RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() were
added in OpenSSL 1.1.1.

Other functions described here were added in OpenSSL 1.1.0.

=head1 COPYRIGHT

Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut
Commit	Line	Data
cd35e6c0 RL	1	=pod
	2
	3	=head1 NAME
	4
c952780c	5	RSA_meth_get0_app_data, RSA_meth_set0_app_data,
cd35e6c0 RL	6	RSA_meth_new, RSA_meth_free, RSA_meth_dup, RSA_meth_get0_name,
cd35e6c0 RL	7	RSA_meth_set1_name, RSA_meth_get_flags, RSA_meth_set_flags,
c952780c	8	RSA_meth_get_pub_enc,
cd35e6c0 RL	9	RSA_meth_set_pub_enc, RSA_meth_get_pub_dec, RSA_meth_set_pub_dec,
	10	RSA_meth_get_priv_enc, RSA_meth_set_priv_enc, RSA_meth_get_priv_dec,
	11	RSA_meth_set_priv_dec, RSA_meth_get_mod_exp, RSA_meth_set_mod_exp,
	12	RSA_meth_get_bn_mod_exp, RSA_meth_set_bn_mod_exp, RSA_meth_get_init,
	13	RSA_meth_set_init, RSA_meth_get_finish, RSA_meth_set_finish,
	14	RSA_meth_get_sign, RSA_meth_set_sign, RSA_meth_get_verify,
665d899f PY	15	RSA_meth_set_verify, RSA_meth_get_keygen, RSA_meth_set_keygen,
665d899f PY	16	RSA_meth_get_multi_prime_keygen, RSA_meth_set_multi_prime_keygen
cd35e6c0 RL	17	- Routines to build up RSA methods
	18
	19	=head1 SYNOPSIS
	20
	21	#include <openssl/rsa.h>
	22
	23	RSA_METHOD RSA_meth_new(const char name, int flags);
	24	void RSA_meth_free(RSA_METHOD *meth);
e9b77246	25
cd35e6c0	26	RSA_METHOD RSA_meth_dup(const RSA_METHOD meth);
e9b77246	27
cd35e6c0 RL	28	const char RSA_meth_get0_name(const RSA_METHOD meth);
cd35e6c0 RL	29	int RSA_meth_set1_name(RSA_METHOD meth, const char name);
e9b77246	30
693be9a2	31	int RSA_meth_get_flags(const RSA_METHOD *meth);
cd35e6c0	32	int RSA_meth_set_flags(RSA_METHOD *meth, int flags);
e9b77246	33
cd35e6c0 RL	34	void RSA_meth_get0_app_data(const RSA_METHOD meth);
cd35e6c0 RL	35	int RSA_meth_set0_app_data(RSA_METHOD meth, void app_data);
e9b77246 BB	36
	37	int (RSA_meth_get_pub_enc(const RSA_METHOD meth))(int flen, const unsigned char *from,
	38	unsigned char to, RSA rsa, int padding);
cd35e6c0	39	int RSA_meth_set_pub_enc(RSA_METHOD *rsa,
e9b77246 BB	40	int (pub_enc)(int flen, const unsigned char from,
	41	unsigned char to, RSA rsa,
	42	int padding));
	43
cd35e6c0 RL	44	int (RSA_meth_get_pub_dec(const RSA_METHOD meth))
	45	(int flen, const unsigned char *from,
	46	unsigned char to, RSA rsa, int padding);
	47	int RSA_meth_set_pub_dec(RSA_METHOD *rsa,
e9b77246 BB	48	int (pub_dec)(int flen, const unsigned char from,
	49	unsigned char to, RSA rsa,
	50	int padding));
	51
	52	int (RSA_meth_get_priv_enc(const RSA_METHOD meth))(int flen, const unsigned char *from,
	53	unsigned char to, RSA rsa,
	54	int padding);
cd35e6c0	55	int RSA_meth_set_priv_enc(RSA_METHOD *rsa,
e9b77246 BB	56	int (priv_enc)(int flen, const unsigned char from,
	57	unsigned char to, RSA rsa, int padding));
	58
	59	int (RSA_meth_get_priv_dec(const RSA_METHOD meth))(int flen, const unsigned char *from,
	60	unsigned char to, RSA rsa,
	61	int padding);
cd35e6c0	62	int RSA_meth_set_priv_dec(RSA_METHOD *rsa,
e9b77246 BB	63	int (priv_dec)(int flen, const unsigned char from,
	64	unsigned char to, RSA rsa, int padding));
	65
	66	/* Can be null */
972f6788	67	int (RSA_meth_get_mod_exp(const RSA_METHOD meth))(BIGNUM r0, const BIGNUM i,
e9b77246	68	RSA rsa, BN_CTX ctx);
cd35e6c0	69	int RSA_meth_set_mod_exp(RSA_METHOD *rsa,
972f6788	70	int (mod_exp)(BIGNUM r0, const BIGNUM i, RSA rsa,
e9b77246 BB	71	BN_CTX *ctx));
	72
	73	/* Can be null */
	74	int (RSA_meth_get_bn_mod_exp(const RSA_METHOD meth))(BIGNUM r, const BIGNUM a,
	75	const BIGNUM p, const BIGNUM m,
	76	BN_CTX ctx, BN_MONT_CTX m_ctx);
cd35e6c0	77	int RSA_meth_set_bn_mod_exp(RSA_METHOD *rsa,
e9b77246 BB	78	int (bn_mod_exp)(BIGNUM r, const BIGNUM *a,
	79	const BIGNUM p, const BIGNUM m,
	80	BN_CTX ctx, BN_MONT_CTX m_ctx));
	81
	82	/* called at new */
	83	int (RSA_meth_get_init(const RSA_METHOD meth) (RSA *rsa);
	84	int RSA_meth_set_init(RSA_METHOD rsa, int (init (RSA *rsa));
	85
	86	/* called at free */
	87	int (RSA_meth_get_finish(const RSA_METHOD meth))(RSA *rsa);
	88	int RSA_meth_set_finish(RSA_METHOD rsa, int (finish)(RSA *rsa));
	89
	90	int (RSA_meth_get_sign(const RSA_METHOD meth))(int type, const unsigned char *m,
	91	unsigned int m_length,
	92	unsigned char *sigret,
	93	unsigned int siglen, const RSA rsa);
cd35e6c0	94	int RSA_meth_set_sign(RSA_METHOD *rsa,
e9b77246 BB	95	int (sign)(int type, const unsigned char m,
	96	unsigned int m_length, unsigned char *sigret,
	97	unsigned int siglen, const RSA rsa));
	98
	99	int (RSA_meth_get_verify(const RSA_METHOD meth))(int dtype, const unsigned char *m,
	100	unsigned int m_length,
	101	const unsigned char *sigbuf,
	102	unsigned int siglen, const RSA *rsa);
cd35e6c0	103	int RSA_meth_set_verify(RSA_METHOD *rsa,
e9b77246 BB	104	int (verify)(int dtype, const unsigned char m,
	105	unsigned int m_length,
	106	const unsigned char *sigbuf,
	107	unsigned int siglen, const RSA *rsa));
	108
	109	int (RSA_meth_get_keygen(const RSA_METHOD meth))(RSA rsa, int bits, BIGNUM e,
	110	BN_GENCB *cb);
cd35e6c0	111	int RSA_meth_set_keygen(RSA_METHOD *rsa,
e9b77246 BB	112	int (keygen)(RSA rsa, int bits, BIGNUM *e,
e9b77246 BB	113	BN_GENCB *cb));
cd35e6c0	114
665d899f PY	115	int (RSA_meth_get_multi_prime_keygen(const RSA_METHOD meth))(RSA *rsa, int bits,
	116	int primes, BIGNUM *e,
	117	BN_GENCB *cb);
	118
	119	int RSA_meth_set_multi_prime_keygen(RSA_METHOD *meth,
	120	int (keygen) (RSA rsa, int bits,
	121	int primes, BIGNUM *e,
	122	BN_GENCB *cb));
	123
cd35e6c0 RL	124	=head1 DESCRIPTION
	125
	126	The B<RSA_METHOD> type is a structure used for the provision of custom
a970b14f	127	RSA implementations. It provides a set of functions used by OpenSSL
6e4618a0	128	for the implementation of the various RSA capabilities.
cd35e6c0 RL	129
	130	RSA_meth_new() creates a new B<RSA_METHOD> structure. It should be
	131	given a unique B<name> and a set of B<flags>. The B<name> should be a
	132	NULL terminated string, which will be duplicated and stored in the
	133	B<RSA_METHOD> object. It is the callers responsibility to free the
	134	original string. The flags will be used during the construction of a
	135	new B<RSA> object based on this B<RSA_METHOD>. Any new B<RSA> object
	136	will have those flags set by default.
	137
	138	RSA_meth_dup() creates a duplicate copy of the B<RSA_METHOD> object
	139	passed as a parameter. This might be useful for creating a new
	140	B<RSA_METHOD> based on an existing one, but with some differences.
	141
	142	RSA_meth_free() destroys an B<RSA_METHOD> structure and frees up any
	143	memory associated with it.
	144
	145	RSA_meth_get0_name() will return a pointer to the name of this
	146	RSA_METHOD. This is a pointer to the internal name string and so
	147	should not be freed by the caller. RSA_meth_set1_name() sets the name
	148	of the RSA_METHOD to B<name>. The string is duplicated and the copy is
	149	stored in the RSA_METHOD structure, so the caller remains responsible
	150	for freeing the memory associated with the name.
	151
	152	RSA_meth_get_flags() returns the current value of the flags associated
	153	with this RSA_METHOD. RSA_meth_set_flags() provides the ability to set
	154	these flags.
	155
	156	The functions RSA_meth_get0_app_data() and RSA_meth_set0_app_data()
	157	provide the ability to associate implementation specific data with the
	158	RSA_METHOD. It is the application's responsibility to free this data
	159	before the RSA_METHOD is freed via a call to RSA_meth_free().
	160
	161	RSA_meth_get_sign() and RSA_meth_set_sign() get and set the function
	162	used for creating an RSA signature respectively. This function will be
	163	called in response to the application calling RSA_sign(). The
	164	parameters for the function have the same meaning as for RSA_sign().
	165
	166	RSA_meth_get_verify() and RSA_meth_set_verify() get and set the
	167	function used for verifying an RSA signature respectively. This
	168	function will be called in response to the application calling
	169	RSA_verify(). The parameters for the function have the same meaning as
	170	for RSA_verify().
	171
	172	RSA_meth_get_mod_exp() and RSA_meth_set_mod_exp() get and set the
	173	function used for CRT computations.
	174
	175	RSA_meth_get_bn_mod_exp() and RSA_meth_set_bn_mod_exp() get and set
	176	the function used for CRT computations, specifically the following
	177	value:
	178
	179	r = a ^ p mod m
	180
	181	Both the mod_exp() and bn_mod_exp() functions are called by the
	182	default OpenSSL method during encryption, decryption, signing and
	183	verification.
	184
	185	RSA_meth_get_init() and RSA_meth_set_init() get and set the function
	186	used for creating a new RSA instance respectively. This function will
	187	be called in response to the application calling RSA_new() (if the
	188	current default RSA_METHOD is this one) or RSA_new_method(). The
	189	RSA_new() and RSA_new_method() functions will allocate the memory for
	190	the new RSA object, and a pointer to this newly allocated structure
	191	will be passed as a parameter to the function. This function may be
	192	NULL.
193
194	RSA_meth_get_finish() and RSA_meth_set_finish() get and set the
195	function used for destroying an instance of an RSA object respectively.
196	This function will be called in response to the application calling
197	RSA_free(). A pointer to the RSA to be destroyed is passed as a
198	parameter. The destroy function should be used for RSA implementation
199	specific clean up. The memory for the RSA itself should not be freed
200	by this function. This function may be NULL.
201
202	RSA_meth_get_keygen() and RSA_meth_set_keygen() get and set the
203	function used for generating a new RSA key pair respectively. This
204	function will be called in response to the application calling
665d899f PY	205	RSA_generate_key_ex(). The parameter for the function has the same
	206	meaning as for RSA_generate_key_ex().
	207
	208	RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() get
	209	and set the function used for generating a new multi-prime RSA key pair
	210	respectively. This function will be called in response to the application calling
	211	RSA_generate_multi_prime_key(). The parameter for the function has the same
	212	meaning as for RSA_generate_multi_prime_key().
cd35e6c0 RL	213
	214	RSA_meth_get_pub_enc(), RSA_meth_set_pub_enc(),
	215	RSA_meth_get_pub_dec(), RSA_meth_set_pub_dec(),
	216	RSA_meth_get_priv_enc(), RSA_meth_set_priv_enc(),
	217	RSA_meth_get_priv_dec(), RSA_meth_set_priv_dec() get and set the
	218	functions used for public and private key encryption and decryption.
	219	These functions will be called in response to the application calling
	220	RSA_public_encrypt(), RSA_private_decrypt(), RSA_private_encrypt() and
	221	RSA_public_decrypt() and take the same parameters as those.
	222
	223
	224	=head1 RETURN VALUES
	225
	226	RSA_meth_new() and RSA_meth_dup() return the newly allocated
	227	RSA_METHOD object or NULL on failure.
	228
	229	RSA_meth_get0_name() and RSA_meth_get_flags() return the name and
	230	flags associated with the RSA_METHOD respectively.
	231
	232	All other RSA_meth_get_*() functions return the appropriate function
	233	pointer that has been set in the RSA_METHOD, or NULL if no such
	234	pointer has yet been set.
	235
	236	RSA_meth_set1_name and all RSA_meth_set_*() functions return 1 on
	237	success or 0 on failure.
	238
	239	=head1 SEE ALSO
	240
665d899f PY	241	L<RSA_new(3)>, L<RSA_generate_key_ex(3)>, L<RSA_sign(3)>,
	242	L<RSA_set_method(3)>, L<RSA_size(3)>, L<RSA_get0_key(3)>,
	243	L<RSA_generate_multi_prime_key(3)>
cd35e6c0 RL	244
	245	=head1 HISTORY
	246
665d899f PY	247	RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() were
	248	added in OpenSSL 1.1.1.
	249
	250	Other functions described here were added in OpenSSL 1.1.0.
cd35e6c0	251
e2f92610 RS	252	=head1 COPYRIGHT
e2f92610 RS	253
c4d3c19b	254	Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
e2f92610	255
4746f25a	256	Licensed under the Apache License 2.0 (the "License"). You may not use
e2f92610 RS	257	this file except in compliance with the License. You can obtain a copy
	258	in the file LICENSE in the source distribution or at
	259	L<https://www.openssl.org/source/license.html>.
	260
	261	=cut