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| 124 | .\" ======================================================================== |
| 125 | .\" |
| 126 | .IX Title "RSA_set_method 3" |
| 127 | .TH RSA_set_method 3 "2011-02-08" "1.0.0d" "OpenSSL" |
| 128 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
| 129 | .\" way too many mistakes in technical documents. |
| 130 | .if n .ad l |
| 131 | .nh |
| 132 | .SH "NAME" |
| 133 | RSA_set_default_method, RSA_get_default_method, RSA_set_method, |
| 134 | RSA_get_method, RSA_PKCS1_SSLeay, RSA_null_method, RSA_flags, |
| 135 | RSA_new_method \- select RSA method |
| 136 | .SH "SYNOPSIS" |
| 137 | .IX Header "SYNOPSIS" |
| 138 | .Vb 1 |
| 139 | \& #include <openssl/rsa.h> |
| 140 | \& |
| 141 | \& void RSA_set_default_method(const RSA_METHOD *meth); |
| 142 | \& |
| 143 | \& RSA_METHOD *RSA_get_default_method(void); |
| 144 | \& |
| 145 | \& int RSA_set_method(RSA *rsa, const RSA_METHOD *meth); |
| 146 | \& |
| 147 | \& RSA_METHOD *RSA_get_method(const RSA *rsa); |
| 148 | \& |
| 149 | \& RSA_METHOD *RSA_PKCS1_SSLeay(void); |
| 150 | \& |
| 151 | \& RSA_METHOD *RSA_null_method(void); |
| 152 | \& |
| 153 | \& int RSA_flags(const RSA *rsa); |
| 154 | \& |
| 155 | \& RSA *RSA_new_method(RSA_METHOD *method); |
| 156 | .Ve |
| 157 | .SH "DESCRIPTION" |
| 158 | .IX Header "DESCRIPTION" |
| 159 | An \fB\s-1RSA_METHOD\s0\fR specifies the functions that OpenSSL uses for \s-1RSA\s0 |
| 160 | operations. By modifying the method, alternative implementations such as |
| 161 | hardware accelerators may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for |
| 162 | important information about how these \s-1RSA\s0 \s-1API\s0 functions are affected by the |
| 163 | use of \fB\s-1ENGINE\s0\fR \s-1API\s0 calls. |
| 164 | .PP |
| 165 | Initially, the default \s-1RSA_METHOD\s0 is the OpenSSL internal implementation, |
| 166 | as returned by \fIRSA_PKCS1_SSLeay()\fR. |
| 167 | .PP |
| 168 | \&\fIRSA_set_default_method()\fR makes \fBmeth\fR the default method for all \s-1RSA\s0 |
| 169 | structures created later. \fB\s-1NB\s0\fR: This is true only whilst no \s-1ENGINE\s0 has |
| 170 | been set as a default for \s-1RSA\s0, so this function is no longer recommended. |
| 171 | .PP |
| 172 | \&\fIRSA_get_default_method()\fR returns a pointer to the current default |
| 173 | \&\s-1RSA_METHOD\s0. However, the meaningfulness of this result is dependent on |
| 174 | whether the \s-1ENGINE\s0 \s-1API\s0 is being used, so this function is no longer |
| 175 | recommended. |
| 176 | .PP |
| 177 | \&\fIRSA_set_method()\fR selects \fBmeth\fR to perform all operations using the key |
| 178 | \&\fBrsa\fR. This will replace the \s-1RSA_METHOD\s0 used by the \s-1RSA\s0 key and if the |
| 179 | previous method was supplied by an \s-1ENGINE\s0, the handle to that \s-1ENGINE\s0 will |
| 180 | be released during the change. It is possible to have \s-1RSA\s0 keys that only |
| 181 | work with certain \s-1RSA_METHOD\s0 implementations (eg. from an \s-1ENGINE\s0 module |
| 182 | that supports embedded hardware-protected keys), and in such cases |
| 183 | attempting to change the \s-1RSA_METHOD\s0 for the key can have unexpected |
| 184 | results. |
| 185 | .PP |
| 186 | \&\fIRSA_get_method()\fR returns a pointer to the \s-1RSA_METHOD\s0 being used by \fBrsa\fR. |
| 187 | This method may or may not be supplied by an \s-1ENGINE\s0 implementation, but if |
| 188 | it is, the return value can only be guaranteed to be valid as long as the |
| 189 | \&\s-1RSA\s0 key itself is valid and does not have its implementation changed by |
| 190 | \&\fIRSA_set_method()\fR. |
| 191 | .PP |
| 192 | \&\fIRSA_flags()\fR returns the \fBflags\fR that are set for \fBrsa\fR's current |
| 193 | \&\s-1RSA_METHOD\s0. See the \s-1BUGS\s0 section. |
| 194 | .PP |
| 195 | \&\fIRSA_new_method()\fR allocates and initializes an \s-1RSA\s0 structure so that |
| 196 | \&\fBengine\fR will be used for the \s-1RSA\s0 operations. If \fBengine\fR is \s-1NULL\s0, the |
| 197 | default \s-1ENGINE\s0 for \s-1RSA\s0 operations is used, and if no default \s-1ENGINE\s0 is set, |
| 198 | the \s-1RSA_METHOD\s0 controlled by \fIRSA_set_default_method()\fR is used. |
| 199 | .PP |
| 200 | \&\fIRSA_flags()\fR returns the \fBflags\fR that are set for \fBrsa\fR's current method. |
| 201 | .PP |
| 202 | \&\fIRSA_new_method()\fR allocates and initializes an \fB\s-1RSA\s0\fR structure so that |
| 203 | \&\fBmethod\fR will be used for the \s-1RSA\s0 operations. If \fBmethod\fR is \fB\s-1NULL\s0\fR, |
| 204 | the default method is used. |
| 205 | .SH "THE RSA_METHOD STRUCTURE" |
| 206 | .IX Header "THE RSA_METHOD STRUCTURE" |
| 207 | .Vb 4 |
| 208 | \& typedef struct rsa_meth_st |
| 209 | \& { |
| 210 | \& /* name of the implementation */ |
| 211 | \& const char *name; |
| 212 | \& |
| 213 | \& /* encrypt */ |
| 214 | \& int (*rsa_pub_enc)(int flen, unsigned char *from, |
| 215 | \& unsigned char *to, RSA *rsa, int padding); |
| 216 | \& |
| 217 | \& /* verify arbitrary data */ |
| 218 | \& int (*rsa_pub_dec)(int flen, unsigned char *from, |
| 219 | \& unsigned char *to, RSA *rsa, int padding); |
| 220 | \& |
| 221 | \& /* sign arbitrary data */ |
| 222 | \& int (*rsa_priv_enc)(int flen, unsigned char *from, |
| 223 | \& unsigned char *to, RSA *rsa, int padding); |
| 224 | \& |
| 225 | \& /* decrypt */ |
| 226 | \& int (*rsa_priv_dec)(int flen, unsigned char *from, |
| 227 | \& unsigned char *to, RSA *rsa, int padding); |
| 228 | \& |
| 229 | \& /* compute r0 = r0 ^ I mod rsa\->n (May be NULL for some |
| 230 | \& implementations) */ |
| 231 | \& int (*rsa_mod_exp)(BIGNUM *r0, BIGNUM *I, RSA *rsa); |
| 232 | \& |
| 233 | \& /* compute r = a ^ p mod m (May be NULL for some implementations) */ |
| 234 | \& int (*bn_mod_exp)(BIGNUM *r, BIGNUM *a, const BIGNUM *p, |
| 235 | \& const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx); |
| 236 | \& |
| 237 | \& /* called at RSA_new */ |
| 238 | \& int (*init)(RSA *rsa); |
| 239 | \& |
| 240 | \& /* called at RSA_free */ |
| 241 | \& int (*finish)(RSA *rsa); |
| 242 | \& |
| 243 | \& /* RSA_FLAG_EXT_PKEY \- rsa_mod_exp is called for private key |
| 244 | \& * operations, even if p,q,dmp1,dmq1,iqmp |
| 245 | \& * are NULL |
| 246 | \& * RSA_FLAG_SIGN_VER \- enable rsa_sign and rsa_verify |
| 247 | \& * RSA_METHOD_FLAG_NO_CHECK \- don\*(Aqt check pub/private match |
| 248 | \& */ |
| 249 | \& int flags; |
| 250 | \& |
| 251 | \& char *app_data; /* ?? */ |
| 252 | \& |
| 253 | \& /* sign. For backward compatibility, this is used only |
| 254 | \& * if (flags & RSA_FLAG_SIGN_VER) |
| 255 | \& */ |
| 256 | \& int (*rsa_sign)(int type, unsigned char *m, unsigned int m_len, |
| 257 | \& unsigned char *sigret, unsigned int *siglen, RSA *rsa); |
| 258 | \& |
| 259 | \& /* verify. For backward compatibility, this is used only |
| 260 | \& * if (flags & RSA_FLAG_SIGN_VER) |
| 261 | \& */ |
| 262 | \& int (*rsa_verify)(int type, unsigned char *m, unsigned int m_len, |
| 263 | \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa); |
| 264 | \& |
| 265 | \& } RSA_METHOD; |
| 266 | .Ve |
| 267 | .SH "RETURN VALUES" |
| 268 | .IX Header "RETURN VALUES" |
| 269 | \&\fIRSA_PKCS1_SSLeay()\fR, \fIRSA_PKCS1_null_method()\fR, \fIRSA_get_default_method()\fR |
| 270 | and \fIRSA_get_method()\fR return pointers to the respective RSA_METHODs. |
| 271 | .PP |
| 272 | \&\fIRSA_set_default_method()\fR returns no value. |
| 273 | .PP |
| 274 | \&\fIRSA_set_method()\fR returns a pointer to the old \s-1RSA_METHOD\s0 implementation |
| 275 | that was replaced. However, this return value should probably be ignored |
| 276 | because if it was supplied by an \s-1ENGINE\s0, the pointer could be invalidated |
| 277 | at any time if the \s-1ENGINE\s0 is unloaded (in fact it could be unloaded as a |
| 278 | result of the \fIRSA_set_method()\fR function releasing its handle to the |
| 279 | \&\s-1ENGINE\s0). For this reason, the return type may be replaced with a \fBvoid\fR |
| 280 | declaration in a future release. |
| 281 | .PP |
| 282 | \&\fIRSA_new_method()\fR returns \s-1NULL\s0 and sets an error code that can be obtained |
| 283 | by \fIERR_get_error\fR\|(3) if the allocation fails. Otherwise |
| 284 | it returns a pointer to the newly allocated structure. |
| 285 | .SH "NOTES" |
| 286 | .IX Header "NOTES" |
| 287 | As of version 0.9.7, \s-1RSA_METHOD\s0 implementations are grouped together with |
| 288 | other algorithmic APIs (eg. \s-1DSA_METHOD\s0, \s-1EVP_CIPHER\s0, etc) into \fB\s-1ENGINE\s0\fR |
| 289 | modules. If a default \s-1ENGINE\s0 is specified for \s-1RSA\s0 functionality using an |
| 290 | \&\s-1ENGINE\s0 \s-1API\s0 function, that will override any \s-1RSA\s0 defaults set using the \s-1RSA\s0 |
| 291 | \&\s-1API\s0 (ie. \fIRSA_set_default_method()\fR). For this reason, the \s-1ENGINE\s0 \s-1API\s0 is the |
| 292 | recommended way to control default implementations for use in \s-1RSA\s0 and other |
| 293 | cryptographic algorithms. |
| 294 | .SH "BUGS" |
| 295 | .IX Header "BUGS" |
| 296 | The behaviour of \fIRSA_flags()\fR is a mis-feature that is left as-is for now |
| 297 | to avoid creating compatibility problems. \s-1RSA\s0 functionality, such as the |
| 298 | encryption functions, are controlled by the \fBflags\fR value in the \s-1RSA\s0 key |
| 299 | itself, not by the \fBflags\fR value in the \s-1RSA_METHOD\s0 attached to the \s-1RSA\s0 key |
| 300 | (which is what this function returns). If the flags element of an \s-1RSA\s0 key |
| 301 | is changed, the changes will be honoured by \s-1RSA\s0 functionality but will not |
| 302 | be reflected in the return value of the \fIRSA_flags()\fR function \- in effect |
| 303 | \&\fIRSA_flags()\fR behaves more like an \fIRSA_default_flags()\fR function (which does |
| 304 | not currently exist). |
| 305 | .SH "SEE ALSO" |
| 306 | .IX Header "SEE ALSO" |
| 307 | \&\fIrsa\fR\|(3), \fIRSA_new\fR\|(3) |
| 308 | .SH "HISTORY" |
| 309 | .IX Header "HISTORY" |
| 310 | \&\fIRSA_new_method()\fR and \fIRSA_set_default_method()\fR appeared in SSLeay 0.8. |
| 311 | \&\fIRSA_get_default_method()\fR, \fIRSA_set_method()\fR and \fIRSA_get_method()\fR as |
| 312 | well as the rsa_sign and rsa_verify components of \s-1RSA_METHOD\s0 were |
| 313 | added in OpenSSL 0.9.4. |
| 314 | .PP |
| 315 | \&\fIRSA_set_default_openssl_method()\fR and \fIRSA_get_default_openssl_method()\fR |
| 316 | replaced \fIRSA_set_default_method()\fR and \fIRSA_get_default_method()\fR |
| 317 | respectively, and \fIRSA_set_method()\fR and \fIRSA_new_method()\fR were altered to use |
| 318 | \&\fB\s-1ENGINE\s0\fRs rather than \fB\s-1RSA_METHOD\s0\fRs during development of the engine |
| 319 | version of OpenSSL 0.9.6. For 0.9.7, the handling of defaults in the \s-1ENGINE\s0 |
| 320 | \&\s-1API\s0 was restructured so that this change was reversed, and behaviour of the |
| 321 | other functions resembled more closely the previous behaviour. The |
| 322 | behaviour of defaults in the \s-1ENGINE\s0 \s-1API\s0 now transparently overrides the |
| 323 | behaviour of defaults in the \s-1RSA\s0 \s-1API\s0 without requiring changing these |
| 324 | function prototypes. |