1RSA_METH_NEW(3ossl)                 OpenSSL                RSA_METH_NEW(3ossl)
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NAME

6       RSA_meth_get0_app_data, RSA_meth_set0_app_data, RSA_meth_new,
7       RSA_meth_free, RSA_meth_dup, RSA_meth_get0_name, RSA_meth_set1_name,
8       RSA_meth_get_flags, RSA_meth_set_flags, RSA_meth_get_pub_enc,
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,
15       RSA_meth_set_verify, RSA_meth_get_keygen, RSA_meth_set_keygen,
16       RSA_meth_get_multi_prime_keygen, RSA_meth_set_multi_prime_keygen -
17       Routines to build up RSA methods
18

SYNOPSIS

20        #include <openssl/rsa.h>
21
22       The following functions have been deprecated since OpenSSL 3.0, and can
23       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
24       version value, see openssl_user_macros(7):
25
26        RSA_METHOD *RSA_meth_new(const char *name, int flags);
27        void RSA_meth_free(RSA_METHOD *meth);
28
29        RSA_METHOD *RSA_meth_dup(const RSA_METHOD *meth);
30
31        const char *RSA_meth_get0_name(const RSA_METHOD *meth);
32        int RSA_meth_set1_name(RSA_METHOD *meth, const char *name);
33
34        int RSA_meth_get_flags(const RSA_METHOD *meth);
35        int RSA_meth_set_flags(RSA_METHOD *meth, int flags);
36
37        void *RSA_meth_get0_app_data(const RSA_METHOD *meth);
38        int RSA_meth_set0_app_data(RSA_METHOD *meth, void *app_data);
39
40        int (*RSA_meth_get_pub_enc(const RSA_METHOD *meth))(int flen, const unsigned char *from,
41                                                            unsigned char *to, RSA *rsa, int padding);
42        int RSA_meth_set_pub_enc(RSA_METHOD *rsa,
43                                 int (*pub_enc)(int flen, const unsigned char *from,
44                                                unsigned char *to, RSA *rsa,
45                                                int padding));
46
47        int (*RSA_meth_get_pub_dec(const RSA_METHOD *meth))
48            (int flen, const unsigned char *from,
49             unsigned char *to, RSA *rsa, int padding);
50        int RSA_meth_set_pub_dec(RSA_METHOD *rsa,
51                                 int (*pub_dec)(int flen, const unsigned char *from,
52                                                unsigned char *to, RSA *rsa,
53                                                int padding));
54
55        int (*RSA_meth_get_priv_enc(const RSA_METHOD *meth))(int flen, const unsigned char *from,
56                                                             unsigned char *to, RSA *rsa,
57                                                             int padding);
58        int RSA_meth_set_priv_enc(RSA_METHOD *rsa,
59                                  int (*priv_enc)(int flen, const unsigned char *from,
60                                                  unsigned char *to, RSA *rsa, int padding));
61
62        int (*RSA_meth_get_priv_dec(const RSA_METHOD *meth))(int flen, const unsigned char *from,
63                                                             unsigned char *to, RSA *rsa,
64                                                             int padding);
65        int RSA_meth_set_priv_dec(RSA_METHOD *rsa,
66                                  int (*priv_dec)(int flen, const unsigned char *from,
67                                                  unsigned char *to, RSA *rsa, int padding));
68
69        /* Can be null */
70        int (*RSA_meth_get_mod_exp(const RSA_METHOD *meth))(BIGNUM *r0, const BIGNUM *i,
71                                                            RSA *rsa, BN_CTX *ctx);
72        int RSA_meth_set_mod_exp(RSA_METHOD *rsa,
73                                 int (*mod_exp)(BIGNUM *r0, const BIGNUM *i, RSA *rsa,
74                                                BN_CTX *ctx));
75
76        /* Can be null */
77        int (*RSA_meth_get_bn_mod_exp(const RSA_METHOD *meth))(BIGNUM *r, const BIGNUM *a,
78                                                               const BIGNUM *p, const BIGNUM *m,
79                                                               BN_CTX *ctx, BN_MONT_CTX *m_ctx);
80        int RSA_meth_set_bn_mod_exp(RSA_METHOD *rsa,
81                                    int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a,
82                                                      const BIGNUM *p, const BIGNUM *m,
83                                                      BN_CTX *ctx, BN_MONT_CTX *m_ctx));
84
85        /* called at new */
86        int (*RSA_meth_get_init(const RSA_METHOD *meth) (RSA *rsa);
87        int RSA_meth_set_init(RSA_METHOD *rsa, int (*init (RSA *rsa));
88
89        /* called at free */
90        int (*RSA_meth_get_finish(const RSA_METHOD *meth))(RSA *rsa);
91        int RSA_meth_set_finish(RSA_METHOD *rsa, int (*finish)(RSA *rsa));
92
93        int (*RSA_meth_get_sign(const RSA_METHOD *meth))(int type, const unsigned char *m,
94                                                         unsigned int m_length,
95                                                         unsigned char *sigret,
96                                                         unsigned int *siglen, const RSA *rsa);
97        int RSA_meth_set_sign(RSA_METHOD *rsa,
98                              int (*sign)(int type, const unsigned char *m,
99                                          unsigned int m_length, unsigned char *sigret,
100                                          unsigned int *siglen, const RSA *rsa));
101
102        int (*RSA_meth_get_verify(const RSA_METHOD *meth))(int dtype, const unsigned char *m,
103                                                           unsigned int m_length,
104                                                           const unsigned char *sigbuf,
105                                                           unsigned int siglen, const RSA *rsa);
106        int RSA_meth_set_verify(RSA_METHOD *rsa,
107                                int (*verify)(int dtype, const unsigned char *m,
108                                              unsigned int m_length,
109                                              const unsigned char *sigbuf,
110                                              unsigned int siglen, const RSA *rsa));
111
112        int (*RSA_meth_get_keygen(const RSA_METHOD *meth))(RSA *rsa, int bits, BIGNUM *e,
113                                                           BN_GENCB *cb);
114        int RSA_meth_set_keygen(RSA_METHOD *rsa,
115                                int (*keygen)(RSA *rsa, int bits, BIGNUM *e,
116                                              BN_GENCB *cb));
117
118        int (*RSA_meth_get_multi_prime_keygen(const RSA_METHOD *meth))(RSA *rsa, int bits,
119                                                                       int primes, BIGNUM *e,
120                                                                       BN_GENCB *cb);
121
122        int RSA_meth_set_multi_prime_keygen(RSA_METHOD *meth,
123                                            int (*keygen) (RSA *rsa, int bits,
124                                                           int primes, BIGNUM *e,
125                                                           BN_GENCB *cb));
126

DESCRIPTION

128       All of the functions described on this page are deprecated.
129       Applications should instead use the OSSL_PROVIDER APIs.
130
131       The RSA_METHOD type is a structure used for the provision of custom RSA
132       implementations. It provides a set of functions used by OpenSSL for the
133       implementation of the various RSA capabilities.
134
135       RSA_meth_new() creates a new RSA_METHOD structure. It should be given a
136       unique name and a set of flags. The name should be a NULL terminated
137       string, which will be duplicated and stored in the RSA_METHOD object.
138       It is the callers responsibility to free the original string. The flags
139       will be used during the construction of a new RSA object based on this
140       RSA_METHOD. Any new RSA object will have those flags set by default.
141
142       RSA_meth_dup() creates a duplicate copy of the RSA_METHOD object passed
143       as a parameter. This might be useful for creating a new RSA_METHOD
144       based on an existing one, but with some differences.
145
146       RSA_meth_free() destroys an RSA_METHOD structure and frees up any
147       memory associated with it.
148
149       RSA_meth_get0_name() will return a pointer to the name of this
150       RSA_METHOD. This is a pointer to the internal name string and so should
151       not be freed by the caller. RSA_meth_set1_name() sets the name of the
152       RSA_METHOD to name. The string is duplicated and the copy is stored in
153       the RSA_METHOD structure, so the caller remains responsible for freeing
154       the memory associated with the name.
155
156       RSA_meth_get_flags() returns the current value of the flags associated
157       with this RSA_METHOD. RSA_meth_set_flags() provides the ability to set
158       these flags.
159
160       The functions RSA_meth_get0_app_data() and RSA_meth_set0_app_data()
161       provide the ability to associate implementation specific data with the
162       RSA_METHOD. It is the application's responsibility to free this data
163       before the RSA_METHOD is freed via a call to RSA_meth_free().
164
165       RSA_meth_get_sign() and RSA_meth_set_sign() get and set the function
166       used for creating an RSA signature respectively. This function will be
167       called in response to the application calling RSA_sign(). The
168       parameters for the function have the same meaning as for RSA_sign().
169
170       RSA_meth_get_verify() and RSA_meth_set_verify() get and set the
171       function used for verifying an RSA signature respectively. This
172       function will be called in response to the application calling
173       RSA_verify(). The parameters for the function have the same meaning as
174       for RSA_verify().
175
176       RSA_meth_get_mod_exp() and RSA_meth_set_mod_exp() get and set the
177       function used for CRT computations.
178
179       RSA_meth_get_bn_mod_exp() and RSA_meth_set_bn_mod_exp() get and set the
180       function used for CRT computations, specifically the following value:
181
182        r = a ^ p mod m
183
184       Both the mod_exp() and bn_mod_exp() functions are called by the default
185       OpenSSL method during encryption, decryption, signing and verification.
186
187       RSA_meth_get_init() and RSA_meth_set_init() get and set the function
188       used for creating a new RSA instance respectively. This function will
189       be called in response to the application calling RSA_new() (if the
190       current default RSA_METHOD is this one) or RSA_new_method(). The
191       RSA_new() and RSA_new_method() functions will allocate the memory for
192       the new RSA object, and a pointer to this newly allocated structure
193       will be passed as a parameter to the function. This function may be
194       NULL.
195
196       RSA_meth_get_finish() and RSA_meth_set_finish() get and set the
197       function used for destroying an instance of an RSA object respectively.
198       This function will be called in response to the application calling
199       RSA_free(). A pointer to the RSA to be destroyed is passed as a
200       parameter. The destroy function should be used for RSA implementation
201       specific clean up. The memory for the RSA itself should not be freed by
202       this function. This function may be NULL.
203
204       RSA_meth_get_keygen() and RSA_meth_set_keygen() get and set the
205       function used for generating a new RSA key pair respectively. This
206       function will be called in response to the application calling
207       RSA_generate_key_ex(). The parameter for the function has the same
208       meaning as for RSA_generate_key_ex().
209
210       RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen()
211       get and set the function used for generating a new multi-prime RSA key
212       pair respectively. This function will be called in response to the
213       application calling RSA_generate_multi_prime_key(). The parameter for
214       the function has the same meaning as for
215       RSA_generate_multi_prime_key().
216
217       RSA_meth_get_pub_enc(), RSA_meth_set_pub_enc(), RSA_meth_get_pub_dec(),
218       RSA_meth_set_pub_dec(), RSA_meth_get_priv_enc(),
219       RSA_meth_set_priv_enc(), RSA_meth_get_priv_dec(),
220       RSA_meth_set_priv_dec() get and set the functions used for public and
221       private key encryption and decryption.  These functions will be called
222       in response to the application calling RSA_public_encrypt(),
223       RSA_private_decrypt(), RSA_private_encrypt() and RSA_public_decrypt()
224       and take the same parameters as those.
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RETURN VALUES

227       RSA_meth_new() and RSA_meth_dup() return the newly allocated RSA_METHOD
228       object or NULL on failure.
229
230       RSA_meth_get0_name() and RSA_meth_get_flags() return the name and flags
231       associated with the RSA_METHOD respectively.
232
233       All other RSA_meth_get_*() functions return the appropriate function
234       pointer that has been set in the RSA_METHOD, or NULL if no such pointer
235       has yet been set.
236
237       RSA_meth_set1_name and all RSA_meth_set_*() functions return 1 on
238       success or 0 on failure.
239

SEE ALSO

241       RSA_new(3), RSA_generate_key_ex(3), RSA_sign(3), RSA_set_method(3),
242       RSA_size(3), RSA_get0_key(3), RSA_generate_multi_prime_key(3)
243

HISTORY

245       All of these functions were deprecated in OpenSSL 3.0.
246
247       RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen()
248       were added in OpenSSL 1.1.1.
249
250       Other functions described here were added in OpenSSL 1.1.0.
251
253       Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
254
255       Licensed under the Apache License 2.0 (the "License").  You may not use
256       this file except in compliance with the License.  You can obtain a copy
257       in the file LICENSE in the source distribution or at
258       <https://www.openssl.org/source/license.html>.
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2623.0.5                             2022-07-05               RSA_METH_NEW(3ossl)
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