use a generic EC_KEY structure (EC keys are not ECDSA specific)
[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
64 /* Minor tweak to operation: free up EVP_PKEY */
65 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
66         {
67         if (operation == ASN1_OP_FREE_POST)
68                 {
69                 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
70                 EVP_PKEY_free(pubkey->pkey);
71                 }
72         return 1;
73         }
74
75 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
76         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
77         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
78 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
79
80 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
81
82 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
83         {
84         int ok=0;
85         X509_PUBKEY *pk;
86         X509_ALGOR *a;
87         ASN1_OBJECT *o;
88         unsigned char *s,*p = NULL;
89         int i;
90
91         if (x == NULL) return(0);
92
93         if ((pk=X509_PUBKEY_new()) == NULL) goto err;
94         a=pk->algor;
95
96         /* set the algorithm id */
97         if ((o=OBJ_nid2obj(pkey->type)) == NULL) goto err;
98         ASN1_OBJECT_free(a->algorithm);
99         a->algorithm=o;
100
101         /* Set the parameter list */
102         if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA))
103                 {
104                 if ((a->parameter == NULL) ||
105                         (a->parameter->type != V_ASN1_NULL))
106                         {
107                         ASN1_TYPE_free(a->parameter);
108                         a->parameter=ASN1_TYPE_new();
109                         a->parameter->type=V_ASN1_NULL;
110                         }
111                 }
112 #ifndef OPENSSL_NO_DSA
113         else if (pkey->type == EVP_PKEY_DSA)
114                 {
115                 unsigned char *pp;
116                 DSA *dsa;
117                 
118                 dsa=pkey->pkey.dsa;
119                 dsa->write_params=0;
120                 ASN1_TYPE_free(a->parameter);
121                 i=i2d_DSAparams(dsa,NULL);
122                 if ((p=(unsigned char *)OPENSSL_malloc(i)) == NULL) goto err;
123                 pp=p;
124                 i2d_DSAparams(dsa,&pp);
125                 a->parameter=ASN1_TYPE_new();
126                 a->parameter->type=V_ASN1_SEQUENCE;
127                 a->parameter->value.sequence=ASN1_STRING_new();
128                 ASN1_STRING_set(a->parameter->value.sequence,p,i);
129                 OPENSSL_free(p);
130                 }
131 #endif
132 #ifndef OPENSSL_NO_EC
133         else if (pkey->type == EVP_PKEY_EC)
134                 {
135                 int nid=0;
136                 unsigned char *pp;
137                 EC_KEY *eckey;
138                 
139                 eckey = pkey->pkey.eckey;
140                 ASN1_TYPE_free(a->parameter);
141
142                 if ((a->parameter = ASN1_TYPE_new()) == NULL)
143                         {
144                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
145                         goto err;
146                         }
147
148                 if (EC_GROUP_get_asn1_flag(eckey->group)
149                      && (nid = EC_GROUP_get_nid(eckey->group)))
150                         {
151                         /* just set the OID */
152                         a->parameter->type = V_ASN1_OBJECT;
153                         a->parameter->value.object = OBJ_nid2obj(nid);
154                         }
155                 else /* explicit parameters */
156                         {
157                         if ((i = i2d_ECParameters(eckey, NULL)) == 0)
158                                 {
159                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
160                                 goto err;
161                                 }
162                         if ((p = (unsigned char *) OPENSSL_malloc(i)) == NULL)
163                                 {
164                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
165                                 goto err;
166                                 }       
167                         pp = p;
168                         if (!i2d_ECParameters(eckey, &pp))
169                                 {
170                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
171                                 OPENSSL_free(p);
172                                 goto err;
173                                 }
174                         a->parameter->type = V_ASN1_SEQUENCE;
175                         if ((a->parameter->value.sequence = ASN1_STRING_new()) == NULL)
176                                 {
177                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
178                                 OPENSSL_free(p);
179                                 goto err;
180                                 }
181                         ASN1_STRING_set(a->parameter->value.sequence, p, i);
182                         OPENSSL_free(p);
183                         }
184                 }
185 #endif
186         else if (1)
187                 {
188                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
189                 goto err;
190                 }
191
192         if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
193         if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL)
194                 {
195                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
196                 goto err;
197                 }
198         p=s;
199         i2d_PublicKey(pkey,&p);
200         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i)) goto err;
201         /* Set number of unused bits to zero */
202         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
203         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
204
205         OPENSSL_free(s);
206
207 #if 0
208         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
209         pk->pkey=pkey;
210 #endif
211
212         if (*x != NULL)
213                 X509_PUBKEY_free(*x);
214
215         *x=pk;
216         pk=NULL;
217
218         ok=1;
219 err:
220         if (pk != NULL) X509_PUBKEY_free(pk);
221         return(ok);
222         }
223
224 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
225         {
226         EVP_PKEY *ret=NULL;
227         long j;
228         int type;
229         unsigned char *p;
230 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
231         const unsigned char *cp;
232         X509_ALGOR *a;
233 #endif
234
235         if (key == NULL) goto err;
236
237         if (key->pkey != NULL)
238                 {
239                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
240                 return(key->pkey);
241                 }
242
243         if (key->public_key == NULL) goto err;
244
245         type=OBJ_obj2nid(key->algor->algorithm);
246         if ((ret = EVP_PKEY_new()) == NULL)
247                 {
248                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
249                 goto err;
250                 }
251         ret->type = EVP_PKEY_type(type);
252
253         /* the parameters must be extracted before the public key (ECDSA!) */
254         
255 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
256         a=key->algor;
257 #endif
258
259         if (0)
260                 ;
261 #ifndef OPENSSL_NO_DSA
262         else if (ret->type == EVP_PKEY_DSA)
263                 {
264                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
265                         {
266                         if ((ret->pkey.dsa = DSA_new()) == NULL)
267                                 {
268                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
269                                 goto err;
270                                 }
271                         ret->pkey.dsa->write_params=0;
272                         cp=p=a->parameter->value.sequence->data;
273                         j=a->parameter->value.sequence->length;
274                         if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
275                                 goto err;
276                         }
277                 ret->save_parameters=1;
278                 }
279 #endif
280 #ifndef OPENSSL_NO_EC
281         else if (ret->type == EVP_PKEY_EC)
282                 {
283                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
284                         {
285                         /* type == V_ASN1_SEQUENCE => we have explicit parameters
286                          * (e.g. parameters in the X9_62_EC_PARAMETERS-structure )
287                          */
288                         if ((ret->pkey.eckey= EC_KEY_new()) == NULL)
289                                 {
290                                 X509err(X509_F_X509_PUBKEY_GET, 
291                                         ERR_R_MALLOC_FAILURE);
292                                 goto err;
293                                 }
294                         cp = p = a->parameter->value.sequence->data;
295                         j = a->parameter->value.sequence->length;
296                         if (!d2i_ECParameters(&ret->pkey.eckey, &cp, (long)j))
297                                 {
298                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_EC_LIB);
299                                 goto err;
300                                 }
301                         }
302                 else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT))
303                         {
304                         /* type == V_ASN1_OBJECT => the parameters are given
305                          * by an asn1 OID
306                          */
307                         EC_KEY *eckey;
308                         if (ret->pkey.eckey == NULL)
309                                 ret->pkey.eckey = EC_KEY_new();
310                         eckey = ret->pkey.eckey;
311                         if (eckey->group)
312                                 EC_GROUP_free(eckey->group);
313                         if ((eckey->group = EC_GROUP_new_by_nid(
314                              OBJ_obj2nid(a->parameter->value.object))) == NULL)
315                                 goto err;
316                         EC_GROUP_set_asn1_flag(eckey->group, 
317                                                 OPENSSL_EC_NAMED_CURVE);
318                         }
319                         /* the case implicitlyCA is currently not implemented */
320                 ret->save_parameters = 1;
321                 }
322 #endif
323
324         p=key->public_key->data;
325         j=key->public_key->length;
326         if ((ret = d2i_PublicKey(type, &ret, &p, (long)j)) == NULL)
327                 {
328                 X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
329                 goto err;
330                 }
331
332         key->pkey = ret;
333         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
334         return(ret);
335 err:
336         if (ret != NULL)
337                 EVP_PKEY_free(ret);
338         return(NULL);
339         }
340
341 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
342  * and encode or decode as X509_PUBKEY
343  */
344
345 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, unsigned char **pp,
346              long length)
347         {
348         X509_PUBKEY *xpk;
349         EVP_PKEY *pktmp;
350         xpk = d2i_X509_PUBKEY(NULL, pp, length);
351         if(!xpk) return NULL;
352         pktmp = X509_PUBKEY_get(xpk);
353         X509_PUBKEY_free(xpk);
354         if(!pktmp) return NULL;
355         if(a)
356                 {
357                 EVP_PKEY_free(*a);
358                 *a = pktmp;
359                 }
360         return pktmp;
361         }
362
363 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
364         {
365         X509_PUBKEY *xpk=NULL;
366         int ret;
367         if(!a) return 0;
368         if(!X509_PUBKEY_set(&xpk, a)) return 0;
369         ret = i2d_X509_PUBKEY(xpk, pp);
370         X509_PUBKEY_free(xpk);
371         return ret;
372         }
373
374 /* The following are equivalents but which return RSA and DSA
375  * keys
376  */
377 #ifndef OPENSSL_NO_RSA
378 RSA *d2i_RSA_PUBKEY(RSA **a, unsigned char **pp,
379              long length)
380         {
381         EVP_PKEY *pkey;
382         RSA *key;
383         unsigned char *q;
384         q = *pp;
385         pkey = d2i_PUBKEY(NULL, &q, length);
386         if (!pkey) return NULL;
387         key = EVP_PKEY_get1_RSA(pkey);
388         EVP_PKEY_free(pkey);
389         if (!key) return NULL;
390         *pp = q;
391         if (a)
392                 {
393                 RSA_free(*a);
394                 *a = key;
395                 }
396         return key;
397         }
398
399 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
400         {
401         EVP_PKEY *pktmp;
402         int ret;
403         if (!a) return 0;
404         pktmp = EVP_PKEY_new();
405         if (!pktmp)
406                 {
407                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
408                 return 0;
409                 }
410         EVP_PKEY_set1_RSA(pktmp, a);
411         ret = i2d_PUBKEY(pktmp, pp);
412         EVP_PKEY_free(pktmp);
413         return ret;
414         }
415 #endif
416
417 #ifndef OPENSSL_NO_DSA
418 DSA *d2i_DSA_PUBKEY(DSA **a, unsigned char **pp,
419              long length)
420         {
421         EVP_PKEY *pkey;
422         DSA *key;
423         unsigned char *q;
424         q = *pp;
425         pkey = d2i_PUBKEY(NULL, &q, length);
426         if (!pkey) return NULL;
427         key = EVP_PKEY_get1_DSA(pkey);
428         EVP_PKEY_free(pkey);
429         if (!key) return NULL;
430         *pp = q;
431         if (a)
432                 {
433                 DSA_free(*a);
434                 *a = key;
435                 }
436         return key;
437         }
438
439 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
440         {
441         EVP_PKEY *pktmp;
442         int ret;
443         if(!a) return 0;
444         pktmp = EVP_PKEY_new();
445         if(!pktmp)
446                 {
447                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
448                 return 0;
449                 }
450         EVP_PKEY_set1_DSA(pktmp, a);
451         ret = i2d_PUBKEY(pktmp, pp);
452         EVP_PKEY_free(pktmp);
453         return ret;
454         }
455 #endif
456
457 #ifndef OPENSSL_NO_EC
458 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, unsigned char **pp, long length)
459         {
460         EVP_PKEY *pkey;
461         EC_KEY *key;
462         unsigned char *q;
463         q = *pp;
464         pkey = d2i_PUBKEY(NULL, &q, length);
465         if (!pkey) return(NULL);
466         key = EVP_PKEY_get1_EC_KEY(pkey);
467         EVP_PKEY_free(pkey);
468         if (!key)  return(NULL);
469         *pp = q;
470         if (a)
471                 {
472                 EC_KEY_free(*a);
473                 *a = key;
474                 }
475         return(key);
476         }
477
478 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
479         {
480         EVP_PKEY *pktmp;
481         int ret;
482         if (!a) return(0);
483         if ((pktmp = EVP_PKEY_new()) == NULL)
484                 {
485                 ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
486                 return(0);
487                 }
488         EVP_PKEY_set1_EC_KEY(pktmp, a);
489         ret = i2d_PUBKEY(pktmp, pp);
490         EVP_PKEY_free(pktmp);
491         return(ret);
492         }
493 #endif