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140 .IX Title "RSA_set_method 3"
141 .TH RSA_set_method 3 "0.9.7a" "2003-02-19" "OpenSSL"
144 RSA_set_default_method, RSA_get_default_method, RSA_set_method,
145 RSA_get_method, RSA_PKCS1_SSLeay, RSA_null_method, RSA_flags,
146 RSA_new_method \- select \s-1RSA\s0 method
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/rsa.h>
153 \& void RSA_set_default_method(const RSA_METHOD *meth);
156 \& RSA_METHOD *RSA_get_default_method(void);
159 \& int RSA_set_method(RSA *rsa, const RSA_METHOD *meth);
162 \& RSA_METHOD *RSA_get_method(const RSA *rsa);
165 \& RSA_METHOD *RSA_PKCS1_SSLeay(void);
168 \& RSA_METHOD *RSA_null_method(void);
171 \& int RSA_flags(const RSA *rsa);
174 \& RSA *RSA_new_method(RSA_METHOD *method);
177 .IX Header "DESCRIPTION"
178 An \fB\s-1RSA_METHOD\s0\fR specifies the functions that OpenSSL uses for \s-1RSA\s0
179 operations. By modifying the method, alternative implementations such as
180 hardware accelerators may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for
181 important information about how these \s-1RSA\s0 \s-1API\s0 functions are affected by the
182 use of \fB\s-1ENGINE\s0\fR \s-1API\s0 calls.
184 Initially, the default \s-1RSA_METHOD\s0 is the OpenSSL internal implementation,
185 as returned by \fIRSA_PKCS1_SSLeay()\fR.
187 \&\fIRSA_set_default_method()\fR makes \fBmeth\fR the default method for all \s-1RSA\s0
188 structures created later. \fB\s-1NB\s0\fR: This is true only whilst no \s-1ENGINE\s0 has
189 been set as a default for \s-1RSA\s0, so this function is no longer recommended.
191 \&\fIRSA_get_default_method()\fR returns a pointer to the current default
192 \&\s-1RSA_METHOD\s0. However, the meaningfulness of this result is dependant on
193 whether the \s-1ENGINE\s0 \s-1API\s0 is being used, so this function is no longer
196 \&\fIRSA_set_method()\fR selects \fBmeth\fR to perform all operations using the key
197 \&\fBrsa\fR. This will replace the \s-1RSA_METHOD\s0 used by the \s-1RSA\s0 key and if the
198 previous method was supplied by an \s-1ENGINE\s0, the handle to that \s-1ENGINE\s0 will
199 be released during the change. It is possible to have \s-1RSA\s0 keys that only
200 work with certain \s-1RSA_METHOD\s0 implementations (eg. from an \s-1ENGINE\s0 module
201 that supports embedded hardware-protected keys), and in such cases
202 attempting to change the \s-1RSA_METHOD\s0 for the key can have unexpected
205 \&\fIRSA_get_method()\fR returns a pointer to the \s-1RSA_METHOD\s0 being used by \fBrsa\fR.
206 This method may or may not be supplied by an \s-1ENGINE\s0 implementation, but if
207 it is, the return value can only be guaranteed to be valid as long as the
208 \&\s-1RSA\s0 key itself is valid and does not have its implementation changed by
209 \&\fIRSA_set_method()\fR.
211 \&\fIRSA_flags()\fR returns the \fBflags\fR that are set for \fBrsa\fR's current
212 \&\s-1RSA_METHOD\s0. See the \s-1BUGS\s0 section.
214 \&\fIRSA_new_method()\fR allocates and initializes an \s-1RSA\s0 structure so that
215 \&\fBengine\fR will be used for the \s-1RSA\s0 operations. If \fBengine\fR is \s-1NULL\s0, the
216 default \s-1ENGINE\s0 for \s-1RSA\s0 operations is used, and if no default \s-1ENGINE\s0 is set,
217 the \s-1RSA_METHOD\s0 controlled by \fIRSA_set_default_method()\fR is used.
219 \&\fIRSA_flags()\fR returns the \fBflags\fR that are set for \fBrsa\fR's current method.
221 \&\fIRSA_new_method()\fR allocates and initializes an \fB\s-1RSA\s0\fR structure so that
222 \&\fBmethod\fR will be used for the \s-1RSA\s0 operations. If \fBmethod\fR is \fB\s-1NULL\s0\fR,
223 the default method is used.
224 .SH "THE RSA_METHOD STRUCTURE"
225 .IX Header "THE RSA_METHOD STRUCTURE"
227 \& typedef struct rsa_meth_st
229 \& /* name of the implementation */
234 \& int (*rsa_pub_enc)(int flen, unsigned char *from,
235 \& unsigned char *to, RSA *rsa, int padding);
238 \& /* verify arbitrary data */
239 \& int (*rsa_pub_dec)(int flen, unsigned char *from,
240 \& unsigned char *to, RSA *rsa, int padding);
243 \& /* sign arbitrary data */
244 \& int (*rsa_priv_enc)(int flen, unsigned char *from,
245 \& unsigned char *to, RSA *rsa, int padding);
249 \& int (*rsa_priv_dec)(int flen, unsigned char *from,
250 \& unsigned char *to, RSA *rsa, int padding);
253 \& /* compute r0 = r0 ^ I mod rsa->n (May be NULL for some
254 \& implementations) */
255 \& int (*rsa_mod_exp)(BIGNUM *r0, BIGNUM *I, RSA *rsa);
258 \& /* compute r = a ^ p mod m (May be NULL for some implementations) */
259 \& int (*bn_mod_exp)(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
260 \& const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
263 \& /* called at RSA_new */
264 \& int (*init)(RSA *rsa);
267 \& /* called at RSA_free */
268 \& int (*finish)(RSA *rsa);
271 \& /* RSA_FLAG_EXT_PKEY - rsa_mod_exp is called for private key
272 \& * operations, even if p,q,dmp1,dmq1,iqmp
274 \& * RSA_FLAG_SIGN_VER - enable rsa_sign and rsa_verify
275 \& * RSA_METHOD_FLAG_NO_CHECK - don't check pub/private match
280 \& char *app_data; /* ?? */
283 \& /* sign. For backward compatibility, this is used only
284 \& * if (flags & RSA_FLAG_SIGN_VER)
286 \& int (*rsa_sign)(int type, unsigned char *m, unsigned int m_len,
287 \& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
290 \& /* verify. For backward compatibility, this is used only
291 \& * if (flags & RSA_FLAG_SIGN_VER)
293 \& int (*rsa_verify)(int type, unsigned char *m, unsigned int m_len,
294 \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
300 .IX Header "RETURN VALUES"
301 \&\fIRSA_PKCS1_SSLeay()\fR, \fIRSA_PKCS1_null_method()\fR, \fIRSA_get_default_method()\fR
302 and \fIRSA_get_method()\fR return pointers to the respective RSA_METHODs.
304 \&\fIRSA_set_default_method()\fR returns no value.
306 \&\fIRSA_set_method()\fR returns a pointer to the old \s-1RSA_METHOD\s0 implementation
307 that was replaced. However, this return value should probably be ignored
308 because if it was supplied by an \s-1ENGINE\s0, the pointer could be invalidated
309 at any time if the \s-1ENGINE\s0 is unloaded (in fact it could be unloaded as a
310 result of the \fIRSA_set_method()\fR function releasing its handle to the
311 \&\s-1ENGINE\s0). For this reason, the return type may be replaced with a \fBvoid\fR
312 declaration in a future release.
314 \&\fIRSA_new_method()\fR returns \s-1NULL\s0 and sets an error code that can be obtained
315 by ERR_get_error(3) if the allocation fails. Otherwise
316 it returns a pointer to the newly allocated structure.
319 As of version 0.9.7, \s-1RSA_METHOD\s0 implementations are grouped together with
320 other algorithmic APIs (eg. \s-1DSA_METHOD\s0, \s-1EVP_CIPHER\s0, etc) into \fB\s-1ENGINE\s0\fR
321 modules. If a default \s-1ENGINE\s0 is specified for \s-1RSA\s0 functionality using an
322 \&\s-1ENGINE\s0 \s-1API\s0 function, that will override any \s-1RSA\s0 defaults set using the \s-1RSA\s0
323 \&\s-1API\s0 (ie. \fIRSA_set_default_method()\fR). For this reason, the \s-1ENGINE\s0 \s-1API\s0 is the
324 recommended way to control default implementations for use in \s-1RSA\s0 and other
325 cryptographic algorithms.
328 The behaviour of \fIRSA_flags()\fR is a mis-feature that is left as-is for now
329 to avoid creating compatibility problems. \s-1RSA\s0 functionality, such as the
330 encryption functions, are controlled by the \fBflags\fR value in the \s-1RSA\s0 key
331 itself, not by the \fBflags\fR value in the \s-1RSA_METHOD\s0 attached to the \s-1RSA\s0 key
332 (which is what this function returns). If the flags element of an \s-1RSA\s0 key
333 is changed, the changes will be honoured by \s-1RSA\s0 functionality but will not
334 be reflected in the return value of the \fIRSA_flags()\fR function \- in effect
335 \&\fIRSA_flags()\fR behaves more like an \fIRSA_default_flags()\fR function (which does
336 not currently exist).
338 .IX Header "SEE ALSO"
342 \&\fIRSA_new_method()\fR and \fIRSA_set_default_method()\fR appeared in SSLeay 0.8.
343 \&\fIRSA_get_default_method()\fR, \fIRSA_set_method()\fR and \fIRSA_get_method()\fR as
344 well as the rsa_sign and rsa_verify components of \s-1RSA_METHOD\s0 were
345 added in OpenSSL 0.9.4.
347 \&\fIRSA_set_default_openssl_method()\fR and \fIRSA_get_default_openssl_method()\fR
348 replaced \fIRSA_set_default_method()\fR and \fIRSA_get_default_method()\fR
349 respectively, and \fIRSA_set_method()\fR and \fIRSA_new_method()\fR were altered to use
350 \&\fB\s-1ENGINE\s0\fRs rather than \fB\s-1RSA_METHOD\s0\fRs during development of the engine
351 version of OpenSSL 0.9.6. For 0.9.7, the handling of defaults in the \s-1ENGINE\s0
352 \&\s-1API\s0 was restructured so that this change was reversed, and behaviour of the
353 other functions resembled more closely the previous behaviour. The
354 behaviour of defaults in the \s-1ENGINE\s0 \s-1API\s0 now transparently overrides the
355 behaviour of defaults in the \s-1RSA\s0 \s-1API\s0 without requiring changing these