c3bfd8db37b816d13d6631cf42a28251c4fa9655
[openssl.git] / crypto / asn1 / x_pubkey.c
1 /* crypto/asn1/x_pubkey.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/asn1t.h>
62 #include <openssl/x509.h>
63 #include <openssl/rsa.h>
64 #include <openssl/dsa.h>
65
66 /* Minor tweak to operation: free up EVP_PKEY */
67 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
68         {
69         if (operation == ASN1_OP_FREE_POST)
70                 {
71                 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
72                 EVP_PKEY_free(pubkey->pkey);
73                 }
74         return 1;
75         }
76
77 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
78         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
79         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
80 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
81
82 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
83
84 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
85         {
86         X509_PUBKEY *pk=NULL;
87         X509_ALGOR *a;
88         ASN1_OBJECT *o;
89         unsigned char *s,*p = NULL;
90         int i;
91
92         if (x == NULL) return(0);
93
94         if ((pk=X509_PUBKEY_new()) == NULL) goto err;
95         a=pk->algor;
96
97         /* set the algorithm id */
98         if ((o=OBJ_nid2obj(pkey->type)) == NULL) goto err;
99         ASN1_OBJECT_free(a->algorithm);
100         a->algorithm=o;
101
102         /* Set the parameter list */
103         if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA))
104                 {
105                 if ((a->parameter == NULL) ||
106                         (a->parameter->type != V_ASN1_NULL))
107                         {
108                         ASN1_TYPE_free(a->parameter);
109                         if (!(a->parameter=ASN1_TYPE_new()))
110                                 {
111                                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
112                                 goto err;
113                                 }
114                         a->parameter->type=V_ASN1_NULL;
115                         }
116                 }
117 #ifndef OPENSSL_NO_DSA
118         else if (pkey->type == EVP_PKEY_DSA)
119                 {
120                 unsigned char *pp;
121                 DSA *dsa;
122                 
123                 dsa=pkey->pkey.dsa;
124                 dsa->write_params=0;
125                 ASN1_TYPE_free(a->parameter);
126                 if ((i=i2d_DSAparams(dsa,NULL)) <= 0)
127                         goto err;
128                 if (!(p=(unsigned char *)OPENSSL_malloc(i)))
129                         {
130                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
131                         goto err;
132                         }
133                 pp=p;
134                 i2d_DSAparams(dsa,&pp);
135                 if (!(a->parameter=ASN1_TYPE_new()))
136                         {
137                         OPENSSL_free(p);
138                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
139                         goto err;
140                         }
141                 a->parameter->type=V_ASN1_SEQUENCE;
142                 if (!(a->parameter->value.sequence=ASN1_STRING_new()))
143                         {
144                         OPENSSL_free(p);
145                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
146                         goto err;
147                         }
148                 if (!ASN1_STRING_set(a->parameter->value.sequence,p,i))
149                         {
150                         OPENSSL_free(p);
151                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
152                         goto err;
153                         }
154                 OPENSSL_free(p);
155                 }
156 #endif
157 #ifndef OPENSSL_NO_EC
158         else if (pkey->type == EVP_PKEY_EC)
159                 {
160                 int nid=0;
161                 unsigned char *pp;
162                 EC_KEY *eckey;
163                 
164                 eckey = pkey->pkey.eckey;
165                 ASN1_TYPE_free(a->parameter);
166
167                 if ((a->parameter = ASN1_TYPE_new()) == NULL)
168                         {
169                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
170                         goto err;
171                         }
172
173                 if (EC_GROUP_get_asn1_flag(eckey->group)
174                      && (nid = EC_GROUP_get_curve_name(eckey->group)))
175                         {
176                         /* just set the OID */
177                         a->parameter->type = V_ASN1_OBJECT;
178                         a->parameter->value.object = OBJ_nid2obj(nid);
179                         }
180                 else /* explicit parameters */
181                         {
182                         if ((i = i2d_ECParameters(eckey, NULL)) == 0)
183                                 {
184                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
185                                 goto err;
186                                 }
187                         if ((p = (unsigned char *) OPENSSL_malloc(i)) == NULL)
188                                 {
189                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
190                                 goto err;
191                                 }       
192                         pp = p;
193                         if (!i2d_ECParameters(eckey, &pp))
194                                 {
195                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
196                                 OPENSSL_free(p);
197                                 goto err;
198                                 }
199                         a->parameter->type = V_ASN1_SEQUENCE;
200                         if ((a->parameter->value.sequence = ASN1_STRING_new()) == NULL)
201                                 {
202                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
203                                 OPENSSL_free(p);
204                                 goto err;
205                                 }
206                         ASN1_STRING_set(a->parameter->value.sequence, p, i);
207                         OPENSSL_free(p);
208                         }
209                 }
210 #endif
211         else if (1)
212                 {
213                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
214                 goto err;
215                 }
216
217         if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
218         if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL)
219                 {
220                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
221                 goto err;
222                 }
223         p=s;
224         i2d_PublicKey(pkey,&p);
225         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i))
226                 {
227                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
228                 goto err;
229                 }
230         /* Set number of unused bits to zero */
231         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
232         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
233
234         OPENSSL_free(s);
235
236 #if 0
237         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
238         pk->pkey=pkey;
239 #endif
240
241         if (*x != NULL)
242                 X509_PUBKEY_free(*x);
243
244         *x=pk;
245
246         return 1;
247 err:
248         if (pk != NULL) X509_PUBKEY_free(pk);
249         return 0;
250         }
251
252 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
253         {
254         EVP_PKEY *ret=NULL;
255         long j;
256         int type;
257         const unsigned char *p;
258 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
259         const unsigned char *cp;
260         X509_ALGOR *a;
261 #endif
262
263         if (key == NULL) goto err;
264
265         if (key->pkey != NULL)
266                 {
267                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
268                 return(key->pkey);
269                 }
270
271         if (key->public_key == NULL) goto err;
272
273         type=OBJ_obj2nid(key->algor->algorithm);
274         if ((ret = EVP_PKEY_new()) == NULL)
275                 {
276                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
277                 goto err;
278                 }
279         ret->type = EVP_PKEY_type(type);
280
281         /* the parameters must be extracted before the public key (ECDSA!) */
282         
283 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
284         a=key->algor;
285 #endif
286
287         if (0)
288                 ;
289 #ifndef OPENSSL_NO_DSA
290         else if (ret->type == EVP_PKEY_DSA)
291                 {
292                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
293                         {
294                         if ((ret->pkey.dsa = DSA_new()) == NULL)
295                                 {
296                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
297                                 goto err;
298                                 }
299                         ret->pkey.dsa->write_params=0;
300                         cp=p=a->parameter->value.sequence->data;
301                         j=a->parameter->value.sequence->length;
302                         if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
303                                 goto err;
304                         }
305                 ret->save_parameters=1;
306                 }
307 #endif
308 #ifndef OPENSSL_NO_EC
309         else if (ret->type == EVP_PKEY_EC)
310                 {
311                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
312                         {
313                         /* type == V_ASN1_SEQUENCE => we have explicit parameters
314                          * (e.g. parameters in the X9_62_EC_PARAMETERS-structure )
315                          */
316                         if ((ret->pkey.eckey= EC_KEY_new()) == NULL)
317                                 {
318                                 X509err(X509_F_X509_PUBKEY_GET, 
319                                         ERR_R_MALLOC_FAILURE);
320                                 goto err;
321                                 }
322                         cp = p = a->parameter->value.sequence->data;
323                         j = a->parameter->value.sequence->length;
324                         if (!d2i_ECParameters(&ret->pkey.eckey, &cp, (long)j))
325                                 {
326                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_EC_LIB);
327                                 goto err;
328                                 }
329                         }
330                 else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT))
331                         {
332                         /* type == V_ASN1_OBJECT => the parameters are given
333                          * by an asn1 OID
334                          */
335                         EC_KEY *eckey;
336                         if (ret->pkey.eckey == NULL)
337                                 ret->pkey.eckey = EC_KEY_new();
338                         eckey = ret->pkey.eckey;
339                         if (eckey->group)
340                                 EC_GROUP_free(eckey->group);
341                         if ((eckey->group = EC_GROUP_new_by_nid(
342                              OBJ_obj2nid(a->parameter->value.object))) == NULL)
343                                 goto err;
344                         EC_GROUP_set_asn1_flag(eckey->group, 
345                                                 OPENSSL_EC_NAMED_CURVE);
346                         }
347                         /* the case implicitlyCA is currently not implemented */
348                 ret->save_parameters = 1;
349                 }
350 #endif
351
352         p=key->public_key->data;
353         j=key->public_key->length;
354         if (!d2i_PublicKey(type, &ret, &p, (long)j))
355                 {
356                 X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
357                 goto err;
358                 }
359
360         key->pkey = ret;
361         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
362         return(ret);
363 err:
364         if (ret != NULL)
365                 EVP_PKEY_free(ret);
366         return(NULL);
367         }
368
369 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
370  * and encode or decode as X509_PUBKEY
371  */
372
373 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
374              long length)
375         {
376         X509_PUBKEY *xpk;
377         EVP_PKEY *pktmp;
378         xpk = d2i_X509_PUBKEY(NULL, pp, length);
379         if(!xpk) return NULL;
380         pktmp = X509_PUBKEY_get(xpk);
381         X509_PUBKEY_free(xpk);
382         if(!pktmp) return NULL;
383         if(a)
384                 {
385                 EVP_PKEY_free(*a);
386                 *a = pktmp;
387                 }
388         return pktmp;
389         }
390
391 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
392         {
393         X509_PUBKEY *xpk=NULL;
394         int ret;
395         if(!a) return 0;
396         if(!X509_PUBKEY_set(&xpk, a)) return 0;
397         ret = i2d_X509_PUBKEY(xpk, pp);
398         X509_PUBKEY_free(xpk);
399         return ret;
400         }
401
402 /* The following are equivalents but which return RSA and DSA
403  * keys
404  */
405 #ifndef OPENSSL_NO_RSA
406 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
407              long length)
408         {
409         EVP_PKEY *pkey;
410         RSA *key;
411         const unsigned char *q;
412         q = *pp;
413         pkey = d2i_PUBKEY(NULL, &q, length);
414         if (!pkey) return NULL;
415         key = EVP_PKEY_get1_RSA(pkey);
416         EVP_PKEY_free(pkey);
417         if (!key) return NULL;
418         *pp = q;
419         if (a)
420                 {
421                 RSA_free(*a);
422                 *a = key;
423                 }
424         return key;
425         }
426
427 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
428         {
429         EVP_PKEY *pktmp;
430         int ret;
431         if (!a) return 0;
432         pktmp = EVP_PKEY_new();
433         if (!pktmp)
434                 {
435                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
436                 return 0;
437                 }
438         EVP_PKEY_set1_RSA(pktmp, a);
439         ret = i2d_PUBKEY(pktmp, pp);
440         EVP_PKEY_free(pktmp);
441         return ret;
442         }
443 #endif
444
445 #ifndef OPENSSL_NO_DSA
446 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
447              long length)
448         {
449         EVP_PKEY *pkey;
450         DSA *key;
451         const unsigned char *q;
452         q = *pp;
453         pkey = d2i_PUBKEY(NULL, &q, length);
454         if (!pkey) return NULL;
455         key = EVP_PKEY_get1_DSA(pkey);
456         EVP_PKEY_free(pkey);
457         if (!key) return NULL;
458         *pp = q;
459         if (a)
460                 {
461                 DSA_free(*a);
462                 *a = key;
463                 }
464         return key;
465         }
466
467 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
468         {
469         EVP_PKEY *pktmp;
470         int ret;
471         if(!a) return 0;
472         pktmp = EVP_PKEY_new();
473         if(!pktmp)
474                 {
475                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
476                 return 0;
477                 }
478         EVP_PKEY_set1_DSA(pktmp, a);
479         ret = i2d_PUBKEY(pktmp, pp);
480         EVP_PKEY_free(pktmp);
481         return ret;
482         }
483 #endif
484
485 #ifndef OPENSSL_NO_EC
486 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
487         {
488         EVP_PKEY *pkey;
489         EC_KEY *key;
490         const unsigned char *q;
491         q = *pp;
492         pkey = d2i_PUBKEY(NULL, &q, length);
493         if (!pkey) return(NULL);
494         key = EVP_PKEY_get1_EC_KEY(pkey);
495         EVP_PKEY_free(pkey);
496         if (!key)  return(NULL);
497         *pp = q;
498         if (a)
499                 {
500                 EC_KEY_free(*a);
501                 *a = key;
502                 }
503         return(key);
504         }
505
506 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
507         {
508         EVP_PKEY *pktmp;
509         int ret;
510         if (!a) return(0);
511         if ((pktmp = EVP_PKEY_new()) == NULL)
512                 {
513                 ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
514                 return(0);
515                 }
516         EVP_PKEY_set1_EC_KEY(pktmp, a);
517         ret = i2d_PUBKEY(pktmp, pp);
518         EVP_PKEY_free(pktmp);
519         return(ret);
520         }
521 #endif