227b0ce046bc94b9da4f8a0cd1bbbb808dca1127
[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;
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                 p=(unsigned char *)OPENSSL_malloc(i);
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_ECDSA
133         else if (pkey->type == EVP_PKEY_ECDSA)
134                 {
135                 unsigned char *pp;
136                 ECDSA *ecdsa;
137                 
138                 ecdsa = pkey->pkey.ecdsa;
139                 ecdsa->write_params=0;
140                 ASN1_TYPE_free(a->parameter);
141                 if ((i = i2d_ECDSAParameters(ecdsa, NULL)) == 0)
142                         {
143                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ECDSA_LIB);
144                         goto err;
145                         }
146                 if ((p = (unsigned char *) OPENSSL_malloc(i)) == NULL)
147                         {
148                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
149                         goto err;
150                         }       
151                 pp = p;
152                 if (!i2d_ECDSAParameters(ecdsa, &pp))
153                         {
154                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ECDSA_LIB);
155                         OPENSSL_free(p);
156                         goto err;
157                         }
158                 if ((a->parameter = ASN1_TYPE_new()) == NULL)
159                         {
160                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
161                         OPENSSL_free(p);
162                         goto err;
163                         }
164                 a->parameter->type = V_ASN1_SEQUENCE;
165                 if ((a->parameter->value.sequence = ASN1_STRING_new()) == NULL)
166                         {
167                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
168                         OPENSSL_free(p);
169                         goto err;
170                         }
171                 ASN1_STRING_set(a->parameter->value.sequence, p, i);
172                 OPENSSL_free(p);
173                 }
174 #endif
175         else if (1)
176                 {
177                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
178                 goto err;
179                 }
180
181         if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
182         if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL) goto err;
183         p=s;
184         i2d_PublicKey(pkey,&p);
185         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i)) goto err;
186         /* Set number of unused bits to zero */
187         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
188         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
189
190         OPENSSL_free(s);
191
192 #if 0
193         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
194         pk->pkey=pkey;
195 #endif
196
197         if (*x != NULL)
198                 X509_PUBKEY_free(*x);
199
200         *x=pk;
201         pk=NULL;
202
203         ok=1;
204 err:
205         if (pk != NULL) X509_PUBKEY_free(pk);
206         return(ok);
207         }
208
209 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
210         {
211         EVP_PKEY *ret=NULL;
212         long j;
213         int type;
214         unsigned char *p;
215 #ifndef OPENSSL_NO_DSA
216         const unsigned char *cp;
217         X509_ALGOR *a;
218 #endif
219
220         if (key == NULL) goto err;
221
222         if (key->pkey != NULL)
223                 {
224                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
225                 return(key->pkey);
226                 }
227
228         if (key->public_key == NULL) goto err;
229
230         type=OBJ_obj2nid(key->algor->algorithm);
231         if ((ret = EVP_PKEY_new()) == NULL)
232                 {
233                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
234                 goto err;
235                 }
236         ret->type = EVP_PKEY_type(type);
237
238         /* the parameters must be extracted before the public key (ECDSA!) */
239         
240         a=key->algor;
241
242         if (0)
243                 ;
244 #ifndef OPENSSL_NO_DSA
245         else if (ret->type == EVP_PKEY_DSA)
246                 {
247                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
248                         {
249                         if ((ret->pkey.dsa = DSA_new()) == NULL)
250                                 {
251                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
252                                 goto err;
253                                 }
254                         ret->pkey.dsa->write_params=0;
255                         cp=p=a->parameter->value.sequence->data;
256                         j=a->parameter->value.sequence->length;
257                         if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
258                                 goto err;
259                         }
260                 ret->save_parameters=1;
261                 }
262 #endif
263 #ifndef OPENSSL_NO_ECDSA
264         else if (ret->type == EVP_PKEY_ECDSA)
265                 {
266                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
267                         {
268                         if ((ret->pkey.ecdsa= ECDSA_new()) == NULL)
269                                 {
270                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
271                                 goto err;
272                                 }
273                         ret->pkey.ecdsa->write_params = 0;
274                         cp = p = a->parameter->value.sequence->data;
275                         j = a->parameter->value.sequence->length;
276                         if (!d2i_ECDSAParameters(&ret->pkey.ecdsa, &cp, (long)j))
277                                 {
278                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_ECDSA_LIB);
279                                 goto err;
280                                 }
281                         }
282                 ret->save_parameters = 1;
283                 }
284 #endif
285
286         p=key->public_key->data;
287         j=key->public_key->length;
288         if ((ret = d2i_PublicKey(type, &ret, &p, (long)j)) == NULL)
289                 {
290                 X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
291                 goto err;
292                 }
293
294         key->pkey = ret;
295         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
296         return(ret);
297 err:
298         if (ret != NULL)
299                 EVP_PKEY_free(ret);
300         return(NULL);
301         }
302
303 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
304  * and encode or decode as X509_PUBKEY
305  */
306
307 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, unsigned char **pp,
308              long length)
309         {
310         X509_PUBKEY *xpk;
311         EVP_PKEY *pktmp;
312         xpk = d2i_X509_PUBKEY(NULL, pp, length);
313         if(!xpk) return NULL;
314         pktmp = X509_PUBKEY_get(xpk);
315         X509_PUBKEY_free(xpk);
316         if(!pktmp) return NULL;
317         if(a)
318                 {
319                 EVP_PKEY_free(*a);
320                 *a = pktmp;
321                 }
322         return pktmp;
323         }
324
325 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
326         {
327         X509_PUBKEY *xpk=NULL;
328         int ret;
329         if(!a) return 0;
330         if(!X509_PUBKEY_set(&xpk, a)) return 0;
331         ret = i2d_X509_PUBKEY(xpk, pp);
332         X509_PUBKEY_free(xpk);
333         return ret;
334         }
335
336 /* The following are equivalents but which return RSA and DSA
337  * keys
338  */
339 #ifndef OPENSSL_NO_RSA
340 RSA *d2i_RSA_PUBKEY(RSA **a, unsigned char **pp,
341              long length)
342         {
343         EVP_PKEY *pkey;
344         RSA *key;
345         unsigned char *q;
346         q = *pp;
347         pkey = d2i_PUBKEY(NULL, &q, length);
348         if (!pkey) return NULL;
349         key = EVP_PKEY_get1_RSA(pkey);
350         EVP_PKEY_free(pkey);
351         if (!key) return NULL;
352         *pp = q;
353         if (a)
354                 {
355                 RSA_free(*a);
356                 *a = key;
357                 }
358         return key;
359         }
360
361 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
362         {
363         EVP_PKEY *pktmp;
364         int ret;
365         if (!a) return 0;
366         pktmp = EVP_PKEY_new();
367         if (!pktmp)
368                 {
369                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
370                 return 0;
371                 }
372         EVP_PKEY_set1_RSA(pktmp, a);
373         ret = i2d_PUBKEY(pktmp, pp);
374         EVP_PKEY_free(pktmp);
375         return ret;
376         }
377 #endif
378
379 #ifndef OPENSSL_NO_DSA
380 DSA *d2i_DSA_PUBKEY(DSA **a, unsigned char **pp,
381              long length)
382         {
383         EVP_PKEY *pkey;
384         DSA *key;
385         unsigned char *q;
386         q = *pp;
387         pkey = d2i_PUBKEY(NULL, &q, length);
388         if (!pkey) return NULL;
389         key = EVP_PKEY_get1_DSA(pkey);
390         EVP_PKEY_free(pkey);
391         if (!key) return NULL;
392         *pp = q;
393         if (a)
394                 {
395                 DSA_free(*a);
396                 *a = key;
397                 }
398         return key;
399         }
400
401 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
402         {
403         EVP_PKEY *pktmp;
404         int ret;
405         if(!a) return 0;
406         pktmp = EVP_PKEY_new();
407         if(!pktmp)
408                 {
409                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
410                 return 0;
411                 }
412         EVP_PKEY_set1_DSA(pktmp, a);
413         ret = i2d_PUBKEY(pktmp, pp);
414         EVP_PKEY_free(pktmp);
415         return ret;
416         }
417 #endif
418
419 #ifndef OPENSSL_NO_ECDSA
420 ECDSA *d2i_ECDSA_PUBKEY(ECDSA **a, unsigned char **pp, long length)
421         {
422         EVP_PKEY *pkey;
423         ECDSA *key;
424         unsigned char *q;
425         q = *pp;
426         pkey = d2i_PUBKEY(NULL, &q, length);
427         if (!pkey) return(NULL);
428         key = EVP_PKEY_get1_ECDSA(pkey);
429         EVP_PKEY_free(pkey);
430         if (!key)  return(NULL);
431         *pp = q;
432         if (a)
433                 {
434                 ECDSA_free(*a);
435                 *a = key;
436                 }
437         return(key);
438         }
439
440 int i2d_ECDSA_PUBKEY(ECDSA *a, unsigned char **pp)
441         {
442         EVP_PKEY *pktmp;
443         int ret;
444         if (!a) return(0);
445         if ((pktmp = EVP_PKEY_new()) == NULL)
446                 {
447                 ASN1err(ASN1_F_I2D_ECDSA_PUBKEY, ERR_R_MALLOC_FAILURE);
448                 return(0);
449                 }
450         EVP_PKEY_set1_ECDSA(pktmp, a);
451         ret = i2d_PUBKEY(pktmp, pp);
452         EVP_PKEY_free(pktmp);
453         return(ret);
454         }
455 #endif