xref: /freebsd/crypto/openssl/crypto/rsa/rsa_pmeth.c (revision 4f52dfbb8d6c4d446500c5b097e3806ec219fbd4)
1 /* crypto/rsa/rsa_pmeth.c */
2 /*
3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4  * 2006.
5  */
6 /* ====================================================================
7  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in
18  *    the documentation and/or other materials provided with the
19  *    distribution.
20  *
21  * 3. All advertising materials mentioning features or use of this
22  *    software must display the following acknowledgment:
23  *    "This product includes software developed by the OpenSSL Project
24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25  *
26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27  *    endorse or promote products derived from this software without
28  *    prior written permission. For written permission, please contact
29  *    licensing@OpenSSL.org.
30  *
31  * 5. Products derived from this software may not be called "OpenSSL"
32  *    nor may "OpenSSL" appear in their names without prior written
33  *    permission of the OpenSSL Project.
34  *
35  * 6. Redistributions of any form whatsoever must retain the following
36  *    acknowledgment:
37  *    "This product includes software developed by the OpenSSL Project
38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51  * OF THE POSSIBILITY OF SUCH DAMAGE.
52  * ====================================================================
53  *
54  * This product includes cryptographic software written by Eric Young
55  * (eay@cryptsoft.com).  This product includes software written by Tim
56  * Hudson (tjh@cryptsoft.com).
57  *
58  */
59 
60 #include <stdio.h>
61 #include "cryptlib.h"
62 #include <openssl/asn1t.h>
63 #include <openssl/x509.h>
64 #include <openssl/rsa.h>
65 #include <openssl/bn.h>
66 #include <openssl/evp.h>
67 #include <openssl/x509v3.h>
68 #ifndef OPENSSL_NO_CMS
69 # include <openssl/cms.h>
70 #endif
71 #ifdef OPENSSL_FIPS
72 # include <openssl/fips.h>
73 #endif
74 #include "evp_locl.h"
75 #include "rsa_locl.h"
76 
77 /* RSA pkey context structure */
78 
79 typedef struct {
80     /* Key gen parameters */
81     int nbits;
82     BIGNUM *pub_exp;
83     /* Keygen callback info */
84     int gentmp[2];
85     /* RSA padding mode */
86     int pad_mode;
87     /* message digest */
88     const EVP_MD *md;
89     /* message digest for MGF1 */
90     const EVP_MD *mgf1md;
91     /* PSS salt length */
92     int saltlen;
93     /* Temp buffer */
94     unsigned char *tbuf;
95     /* OAEP label */
96     unsigned char *oaep_label;
97     size_t oaep_labellen;
98 } RSA_PKEY_CTX;
99 
100 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
101 {
102     RSA_PKEY_CTX *rctx;
103     rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
104     if (!rctx)
105         return 0;
106     rctx->nbits = 1024;
107     rctx->pub_exp = NULL;
108     rctx->pad_mode = RSA_PKCS1_PADDING;
109     rctx->md = NULL;
110     rctx->mgf1md = NULL;
111     rctx->tbuf = NULL;
112 
113     rctx->saltlen = -2;
114 
115     rctx->oaep_label = NULL;
116     rctx->oaep_labellen = 0;
117 
118     ctx->data = rctx;
119     ctx->keygen_info = rctx->gentmp;
120     ctx->keygen_info_count = 2;
121 
122     return 1;
123 }
124 
125 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
126 {
127     RSA_PKEY_CTX *dctx, *sctx;
128     if (!pkey_rsa_init(dst))
129         return 0;
130     sctx = src->data;
131     dctx = dst->data;
132     dctx->nbits = sctx->nbits;
133     if (sctx->pub_exp) {
134         dctx->pub_exp = BN_dup(sctx->pub_exp);
135         if (!dctx->pub_exp)
136             return 0;
137     }
138     dctx->pad_mode = sctx->pad_mode;
139     dctx->md = sctx->md;
140     dctx->mgf1md = sctx->mgf1md;
141     if (sctx->oaep_label) {
142         if (dctx->oaep_label)
143             OPENSSL_free(dctx->oaep_label);
144         dctx->oaep_label = BUF_memdup(sctx->oaep_label, sctx->oaep_labellen);
145         if (!dctx->oaep_label)
146             return 0;
147         dctx->oaep_labellen = sctx->oaep_labellen;
148     }
149     return 1;
150 }
151 
152 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
153 {
154     if (ctx->tbuf)
155         return 1;
156     ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
157     if (!ctx->tbuf)
158         return 0;
159     return 1;
160 }
161 
162 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
163 {
164     RSA_PKEY_CTX *rctx = ctx->data;
165     if (rctx) {
166         if (rctx->pub_exp)
167             BN_free(rctx->pub_exp);
168         if (rctx->tbuf)
169             OPENSSL_free(rctx->tbuf);
170         if (rctx->oaep_label)
171             OPENSSL_free(rctx->oaep_label);
172         OPENSSL_free(rctx);
173     }
174 }
175 
176 #ifdef OPENSSL_FIPS
177 /*
178  * FIP checker. Return value indicates status of context parameters: 1 :
179  * redirect to FIPS. 0 : don't redirect to FIPS. -1 : illegal operation in
180  * FIPS mode.
181  */
182 
183 static int pkey_fips_check_rsa(const RSA *rsa, const EVP_MD **pmd,
184                                const EVP_MD **pmgf1md)
185 {
186     int rv = -1;
187 
188     if (!FIPS_mode())
189         return 0;
190     if (rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)
191         rv = 0;
192     if (!(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) && rv)
193         return -1;
194     if (*pmd != NULL) {
195         *pmd = FIPS_get_digestbynid(EVP_MD_type(*pmd));
196         if (*pmd == NULL || !((*pmd)->flags & EVP_MD_FLAG_FIPS))
197             return rv;
198     }
199     if (*pmgf1md != NULL) {
200         *pmgf1md = FIPS_get_digestbynid(EVP_MD_type(*pmgf1md));
201         if (*pmgf1md == NULL || !((*pmgf1md)->flags & EVP_MD_FLAG_FIPS))
202             return rv;
203     }
204     return 1;
205 }
206 #endif
207 
208 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
209                          size_t *siglen, const unsigned char *tbs,
210                          size_t tbslen)
211 {
212     int ret;
213     RSA_PKEY_CTX *rctx = ctx->data;
214     RSA *rsa = ctx->pkey->pkey.rsa;
215     const EVP_MD *md = rctx->md;
216     const EVP_MD *mgf1md = rctx->mgf1md;
217 
218 #ifdef OPENSSL_FIPS
219     ret = pkey_fips_check_rsa(rsa, &md, &mgf1md);
220     if (ret < 0) {
221         RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
222         return -1;
223     }
224 #endif
225 
226     if (md != NULL) {
227         if (tbslen != (size_t)EVP_MD_size(md)) {
228             RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
229             return -1;
230         }
231 #ifdef OPENSSL_FIPS
232         if (ret > 0) {
233             unsigned int slen;
234             ret = FIPS_rsa_sign_digest(rsa, tbs, tbslen, md, rctx->pad_mode,
235                                        rctx->saltlen, mgf1md, sig, &slen);
236             if (ret > 0)
237                 *siglen = slen;
238             else
239                 *siglen = 0;
240             return ret;
241         }
242 #endif
243 
244         if (EVP_MD_type(md) == NID_mdc2) {
245             unsigned int sltmp;
246             if (rctx->pad_mode != RSA_PKCS1_PADDING)
247                 return -1;
248             ret = RSA_sign_ASN1_OCTET_STRING(NID_mdc2, tbs, tbslen, sig, &sltmp,
249                                              rsa);
250 
251             if (ret <= 0)
252                 return ret;
253             ret = sltmp;
254         } else if (rctx->pad_mode == RSA_X931_PADDING) {
255             if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
256                 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
257                 return -1;
258             }
259             if (!setup_tbuf(rctx, ctx)) {
260                 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
261                 return -1;
262             }
263             memcpy(rctx->tbuf, tbs, tbslen);
264             rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(md));
265             ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
266                                       sig, rsa, RSA_X931_PADDING);
267         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
268             unsigned int sltmp;
269             ret = RSA_sign(EVP_MD_type(md), tbs, tbslen, sig, &sltmp, rsa);
270             if (ret <= 0)
271                 return ret;
272             ret = sltmp;
273         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
274             if (!setup_tbuf(rctx, ctx))
275                 return -1;
276             if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa, rctx->tbuf, tbs,
277                                                 md, mgf1md, rctx->saltlen))
278                 return -1;
279             ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
280                                       sig, rsa, RSA_NO_PADDING);
281         } else
282             return -1;
283     } else
284         ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
285                                   rctx->pad_mode);
286     if (ret < 0)
287         return ret;
288     *siglen = ret;
289     return 1;
290 }
291 
292 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
293                                   unsigned char *rout, size_t *routlen,
294                                   const unsigned char *sig, size_t siglen)
295 {
296     int ret;
297     RSA_PKEY_CTX *rctx = ctx->data;
298 
299     if (rctx->md) {
300         if (rctx->pad_mode == RSA_X931_PADDING) {
301             if (!setup_tbuf(rctx, ctx))
302                 return -1;
303             ret = RSA_public_decrypt(siglen, sig,
304                                      rctx->tbuf, ctx->pkey->pkey.rsa,
305                                      RSA_X931_PADDING);
306             if (ret < 1)
307                 return 0;
308             ret--;
309             if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
310                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
311                        RSA_R_ALGORITHM_MISMATCH);
312                 return 0;
313             }
314             if (ret != EVP_MD_size(rctx->md)) {
315                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
316                        RSA_R_INVALID_DIGEST_LENGTH);
317                 return 0;
318             }
319             if (rout)
320                 memcpy(rout, rctx->tbuf, ret);
321         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
322             size_t sltmp;
323             ret = int_rsa_verify(EVP_MD_type(rctx->md),
324                                  NULL, 0, rout, &sltmp,
325                                  sig, siglen, ctx->pkey->pkey.rsa);
326             if (ret <= 0)
327                 return 0;
328             ret = sltmp;
329         } else
330             return -1;
331     } else
332         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
333                                  rctx->pad_mode);
334     if (ret < 0)
335         return ret;
336     *routlen = ret;
337     return 1;
338 }
339 
340 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
341                            const unsigned char *sig, size_t siglen,
342                            const unsigned char *tbs, size_t tbslen)
343 {
344     RSA_PKEY_CTX *rctx = ctx->data;
345     RSA *rsa = ctx->pkey->pkey.rsa;
346     const EVP_MD *md = rctx->md;
347     const EVP_MD *mgf1md = rctx->mgf1md;
348     size_t rslen;
349 
350 #ifdef OPENSSL_FIPS
351     int rv = pkey_fips_check_rsa(rsa, &md, &mgf1md);
352 
353     if (rv < 0) {
354         RSAerr(RSA_F_PKEY_RSA_VERIFY,
355                RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
356         return -1;
357     }
358 #endif
359     if (md != NULL) {
360 #ifdef OPENSSL_FIPS
361         if (rv > 0) {
362             return FIPS_rsa_verify_digest(rsa, tbs, tbslen, md, rctx->pad_mode,
363                                           rctx->saltlen, mgf1md, sig, siglen);
364 
365         }
366 #endif
367         if (rctx->pad_mode == RSA_PKCS1_PADDING)
368             return RSA_verify(EVP_MD_type(md), tbs, tbslen,
369                               sig, siglen, rsa);
370         if (tbslen != (size_t)EVP_MD_size(md)) {
371             RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
372             return -1;
373         }
374         if (rctx->pad_mode == RSA_X931_PADDING) {
375             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
376                 return 0;
377         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
378             int ret;
379             if (!setup_tbuf(rctx, ctx))
380                 return -1;
381             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
382                                      rsa, RSA_NO_PADDING);
383             if (ret <= 0)
384                 return 0;
385             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs, md, mgf1md,
386                                             rctx->tbuf, rctx->saltlen);
387             if (ret <= 0)
388                 return 0;
389             return 1;
390         } else
391             return -1;
392     } else {
393         if (!setup_tbuf(rctx, ctx))
394             return -1;
395         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
396                                    rsa, rctx->pad_mode);
397         if (rslen == 0)
398             return 0;
399     }
400 
401     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
402         return 0;
403 
404     return 1;
405 
406 }
407 
408 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
409                             unsigned char *out, size_t *outlen,
410                             const unsigned char *in, size_t inlen)
411 {
412     int ret;
413     RSA_PKEY_CTX *rctx = ctx->data;
414     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
415         int klen = RSA_size(ctx->pkey->pkey.rsa);
416         if (!setup_tbuf(rctx, ctx))
417             return -1;
418         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
419                                              in, inlen,
420                                              rctx->oaep_label,
421                                              rctx->oaep_labellen,
422                                              rctx->md, rctx->mgf1md))
423             return -1;
424         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
425                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
426     } else
427         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
428                                  rctx->pad_mode);
429     if (ret < 0)
430         return ret;
431     *outlen = ret;
432     return 1;
433 }
434 
435 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
436                             unsigned char *out, size_t *outlen,
437                             const unsigned char *in, size_t inlen)
438 {
439     int ret;
440     RSA_PKEY_CTX *rctx = ctx->data;
441     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
442         if (!setup_tbuf(rctx, ctx))
443             return -1;
444         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
445                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
446         if (ret <= 0)
447             return ret;
448         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
449                                                 ret, ret,
450                                                 rctx->oaep_label,
451                                                 rctx->oaep_labellen,
452                                                 rctx->md, rctx->mgf1md);
453     } else
454         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
455                                   rctx->pad_mode);
456     if (ret < 0)
457         return ret;
458     *outlen = ret;
459     return 1;
460 }
461 
462 static int check_padding_md(const EVP_MD *md, int padding)
463 {
464     if (!md)
465         return 1;
466 
467     if (padding == RSA_NO_PADDING) {
468         RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
469         return 0;
470     }
471 
472     if (padding == RSA_X931_PADDING) {
473         if (RSA_X931_hash_id(EVP_MD_type(md)) == -1) {
474             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
475             return 0;
476         }
477         return 1;
478     }
479 
480     return 1;
481 }
482 
483 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
484 {
485     RSA_PKEY_CTX *rctx = ctx->data;
486     switch (type) {
487     case EVP_PKEY_CTRL_RSA_PADDING:
488         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
489             if (!check_padding_md(rctx->md, p1))
490                 return 0;
491             if (p1 == RSA_PKCS1_PSS_PADDING) {
492                 if (!(ctx->operation &
493                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
494                     goto bad_pad;
495                 if (!rctx->md)
496                     rctx->md = EVP_sha1();
497             }
498             if (p1 == RSA_PKCS1_OAEP_PADDING) {
499                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
500                     goto bad_pad;
501                 if (!rctx->md)
502                     rctx->md = EVP_sha1();
503             }
504             rctx->pad_mode = p1;
505             return 1;
506         }
507  bad_pad:
508         RSAerr(RSA_F_PKEY_RSA_CTRL,
509                RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
510         return -2;
511 
512     case EVP_PKEY_CTRL_GET_RSA_PADDING:
513         *(int *)p2 = rctx->pad_mode;
514         return 1;
515 
516     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
517     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
518         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
519             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
520             return -2;
521         }
522         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
523             *(int *)p2 = rctx->saltlen;
524         else {
525             if (p1 < -2)
526                 return -2;
527             rctx->saltlen = p1;
528         }
529         return 1;
530 
531     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
532         if (p1 < 256) {
533             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
534             return -2;
535         }
536         rctx->nbits = p1;
537         return 1;
538 
539     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
540         if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
541             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
542             return -2;
543         }
544         BN_free(rctx->pub_exp);
545         rctx->pub_exp = p2;
546         return 1;
547 
548     case EVP_PKEY_CTRL_RSA_OAEP_MD:
549     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
550         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
551             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
552             return -2;
553         }
554         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
555             *(const EVP_MD **)p2 = rctx->md;
556         else
557             rctx->md = p2;
558         return 1;
559 
560     case EVP_PKEY_CTRL_MD:
561         if (!check_padding_md(p2, rctx->pad_mode))
562             return 0;
563         rctx->md = p2;
564         return 1;
565 
566     case EVP_PKEY_CTRL_GET_MD:
567         *(const EVP_MD **)p2 = rctx->md;
568         return 1;
569 
570     case EVP_PKEY_CTRL_RSA_MGF1_MD:
571     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
572         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
573             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
574             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
575             return -2;
576         }
577         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
578             if (rctx->mgf1md)
579                 *(const EVP_MD **)p2 = rctx->mgf1md;
580             else
581                 *(const EVP_MD **)p2 = rctx->md;
582         } else
583             rctx->mgf1md = p2;
584         return 1;
585 
586     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
587         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
588             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
589             return -2;
590         }
591         if (rctx->oaep_label)
592             OPENSSL_free(rctx->oaep_label);
593         if (p2 && p1 > 0) {
594             rctx->oaep_label = p2;
595             rctx->oaep_labellen = p1;
596         } else {
597             rctx->oaep_label = NULL;
598             rctx->oaep_labellen = 0;
599         }
600         return 1;
601 
602     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
603         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
604             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
605             return -2;
606         }
607         *(unsigned char **)p2 = rctx->oaep_label;
608         return rctx->oaep_labellen;
609 
610     case EVP_PKEY_CTRL_DIGESTINIT:
611     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
612     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
613     case EVP_PKEY_CTRL_PKCS7_SIGN:
614         return 1;
615 #ifndef OPENSSL_NO_CMS
616     case EVP_PKEY_CTRL_CMS_DECRYPT:
617     case EVP_PKEY_CTRL_CMS_ENCRYPT:
618     case EVP_PKEY_CTRL_CMS_SIGN:
619         return 1;
620 #endif
621     case EVP_PKEY_CTRL_PEER_KEY:
622         RSAerr(RSA_F_PKEY_RSA_CTRL,
623                RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
624         return -2;
625 
626     default:
627         return -2;
628 
629     }
630 }
631 
632 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
633                              const char *type, const char *value)
634 {
635     if (!value) {
636         RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
637         return 0;
638     }
639     if (!strcmp(type, "rsa_padding_mode")) {
640         int pm;
641         if (!strcmp(value, "pkcs1"))
642             pm = RSA_PKCS1_PADDING;
643         else if (!strcmp(value, "sslv23"))
644             pm = RSA_SSLV23_PADDING;
645         else if (!strcmp(value, "none"))
646             pm = RSA_NO_PADDING;
647         else if (!strcmp(value, "oeap"))
648             pm = RSA_PKCS1_OAEP_PADDING;
649         else if (!strcmp(value, "oaep"))
650             pm = RSA_PKCS1_OAEP_PADDING;
651         else if (!strcmp(value, "x931"))
652             pm = RSA_X931_PADDING;
653         else if (!strcmp(value, "pss"))
654             pm = RSA_PKCS1_PSS_PADDING;
655         else {
656             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
657             return -2;
658         }
659         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
660     }
661 
662     if (!strcmp(type, "rsa_pss_saltlen")) {
663         int saltlen;
664         saltlen = atoi(value);
665         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
666     }
667 
668     if (!strcmp(type, "rsa_keygen_bits")) {
669         int nbits;
670         nbits = atoi(value);
671         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
672     }
673 
674     if (!strcmp(type, "rsa_keygen_pubexp")) {
675         int ret;
676         BIGNUM *pubexp = NULL;
677         if (!BN_asc2bn(&pubexp, value))
678             return 0;
679         ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
680         if (ret <= 0)
681             BN_free(pubexp);
682         return ret;
683     }
684 
685     if (!strcmp(type, "rsa_mgf1_md")) {
686         const EVP_MD *md;
687         if (!(md = EVP_get_digestbyname(value))) {
688             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
689             return 0;
690         }
691         return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
692     }
693 
694     if (!strcmp(type, "rsa_oaep_md")) {
695         const EVP_MD *md;
696         if (!(md = EVP_get_digestbyname(value))) {
697             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
698             return 0;
699         }
700         return EVP_PKEY_CTX_set_rsa_oaep_md(ctx, md);
701     }
702     if (!strcmp(type, "rsa_oaep_label")) {
703         unsigned char *lab;
704         long lablen;
705         int ret;
706         lab = string_to_hex(value, &lablen);
707         if (!lab)
708             return 0;
709         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
710         if (ret <= 0)
711             OPENSSL_free(lab);
712         return ret;
713     }
714 
715     return -2;
716 }
717 
718 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
719 {
720     RSA *rsa = NULL;
721     RSA_PKEY_CTX *rctx = ctx->data;
722     BN_GENCB *pcb, cb;
723     int ret;
724     if (!rctx->pub_exp) {
725         rctx->pub_exp = BN_new();
726         if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
727             return 0;
728     }
729     rsa = RSA_new();
730     if (!rsa)
731         return 0;
732     if (ctx->pkey_gencb) {
733         pcb = &cb;
734         evp_pkey_set_cb_translate(pcb, ctx);
735     } else
736         pcb = NULL;
737     ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
738     if (ret > 0)
739         EVP_PKEY_assign_RSA(pkey, rsa);
740     else
741         RSA_free(rsa);
742     return ret;
743 }
744 
745 const EVP_PKEY_METHOD rsa_pkey_meth = {
746     EVP_PKEY_RSA,
747     EVP_PKEY_FLAG_AUTOARGLEN,
748     pkey_rsa_init,
749     pkey_rsa_copy,
750     pkey_rsa_cleanup,
751 
752     0, 0,
753 
754     0,
755     pkey_rsa_keygen,
756 
757     0,
758     pkey_rsa_sign,
759 
760     0,
761     pkey_rsa_verify,
762 
763     0,
764     pkey_rsa_verifyrecover,
765 
766     0, 0, 0, 0,
767 
768     0,
769     pkey_rsa_encrypt,
770 
771     0,
772     pkey_rsa_decrypt,
773 
774     0, 0,
775 
776     pkey_rsa_ctrl,
777     pkey_rsa_ctrl_str
778 };
779