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 "asn1_locl.h"
64#ifndef OPENSSL_NO_RSA
65#include <openssl/rsa.h>
66#endif
67#ifndef OPENSSL_NO_DSA
68#include <openssl/dsa.h>
69#endif
70
71/* Minor tweak to operation: free up EVP_PKEY */
72static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
73			void *exarg)
74	{
75	if (operation == ASN1_OP_FREE_POST)
76		{
77		X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
78		EVP_PKEY_free(pubkey->pkey);
79		}
80	return 1;
81	}
82
83ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
84	ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
85	ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
86} ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
87
88IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
89
90int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
91	{
92	X509_PUBKEY *pk=NULL;
93
94	if (x == NULL) return(0);
95
96	if ((pk=X509_PUBKEY_new()) == NULL) goto error;
97
98	if (pkey->ameth)
99		{
100		if (pkey->ameth->pub_encode)
101			{
102			if (!pkey->ameth->pub_encode(pk, pkey))
103				{
104				X509err(X509_F_X509_PUBKEY_SET,
105					X509_R_PUBLIC_KEY_ENCODE_ERROR);
106				goto error;
107				}
108			}
109		else
110			{
111			X509err(X509_F_X509_PUBKEY_SET,
112				X509_R_METHOD_NOT_SUPPORTED);
113			goto error;
114			}
115		}
116	else
117		{
118		X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
119		goto error;
120		}
121
122	if (*x != NULL)
123		X509_PUBKEY_free(*x);
124
125	*x=pk;
126
127	return 1;
128error:
129	if (pk != NULL) X509_PUBKEY_free(pk);
130	return 0;
131	}
132
133EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
134	{
135	EVP_PKEY *ret=NULL;
136
137	if (key == NULL) goto error;
138
139	if (key->pkey != NULL)
140		{
141		CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
142		return key->pkey;
143		}
144
145	if (key->public_key == NULL) goto error;
146
147	if ((ret = EVP_PKEY_new()) == NULL)
148		{
149		X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
150		goto error;
151		}
152
153	if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm)))
154		{
155		X509err(X509_F_X509_PUBKEY_GET,X509_R_UNSUPPORTED_ALGORITHM);
156		goto error;
157		}
158
159	if (ret->ameth->pub_decode)
160		{
161		if (!ret->ameth->pub_decode(ret, key))
162			{
163			X509err(X509_F_X509_PUBKEY_GET,
164						X509_R_PUBLIC_KEY_DECODE_ERROR);
165			goto error;
166			}
167		}
168	else
169		{
170		X509err(X509_F_X509_PUBKEY_GET, X509_R_METHOD_NOT_SUPPORTED);
171		goto error;
172		}
173
174	/* Check to see if another thread set key->pkey first */
175	CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY);
176	if (key->pkey)
177		{
178		CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
179		EVP_PKEY_free(ret);
180		ret = key->pkey;
181		}
182	else
183		{
184		key->pkey = ret;
185		CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
186		}
187	CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
188
189	return ret;
190
191	error:
192	if (ret != NULL)
193		EVP_PKEY_free(ret);
194	return(NULL);
195	}
196
197/* Now two pseudo ASN1 routines that take an EVP_PKEY structure
198 * and encode or decode as X509_PUBKEY
199 */
200
201EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
202	     long length)
203	{
204	X509_PUBKEY *xpk;
205	EVP_PKEY *pktmp;
206	xpk = d2i_X509_PUBKEY(NULL, pp, length);
207	if(!xpk) return NULL;
208	pktmp = X509_PUBKEY_get(xpk);
209	X509_PUBKEY_free(xpk);
210	if(!pktmp) return NULL;
211	if(a)
212		{
213		EVP_PKEY_free(*a);
214		*a = pktmp;
215		}
216	return pktmp;
217	}
218
219int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
220	{
221	X509_PUBKEY *xpk=NULL;
222	int ret;
223	if(!a) return 0;
224	if(!X509_PUBKEY_set(&xpk, a)) return 0;
225	ret = i2d_X509_PUBKEY(xpk, pp);
226	X509_PUBKEY_free(xpk);
227	return ret;
228	}
229
230/* The following are equivalents but which return RSA and DSA
231 * keys
232 */
233#ifndef OPENSSL_NO_RSA
234RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
235	     long length)
236	{
237	EVP_PKEY *pkey;
238	RSA *key;
239	const unsigned char *q;
240	q = *pp;
241	pkey = d2i_PUBKEY(NULL, &q, length);
242	if (!pkey) return NULL;
243	key = EVP_PKEY_get1_RSA(pkey);
244	EVP_PKEY_free(pkey);
245	if (!key) return NULL;
246	*pp = q;
247	if (a)
248		{
249		RSA_free(*a);
250		*a = key;
251		}
252	return key;
253	}
254
255int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
256	{
257	EVP_PKEY *pktmp;
258	int ret;
259	if (!a) return 0;
260	pktmp = EVP_PKEY_new();
261	if (!pktmp)
262		{
263		ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
264		return 0;
265		}
266	EVP_PKEY_set1_RSA(pktmp, a);
267	ret = i2d_PUBKEY(pktmp, pp);
268	EVP_PKEY_free(pktmp);
269	return ret;
270	}
271#endif
272
273#ifndef OPENSSL_NO_DSA
274DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
275	     long length)
276	{
277	EVP_PKEY *pkey;
278	DSA *key;
279	const unsigned char *q;
280	q = *pp;
281	pkey = d2i_PUBKEY(NULL, &q, length);
282	if (!pkey) return NULL;
283	key = EVP_PKEY_get1_DSA(pkey);
284	EVP_PKEY_free(pkey);
285	if (!key) return NULL;
286	*pp = q;
287	if (a)
288		{
289		DSA_free(*a);
290		*a = key;
291		}
292	return key;
293	}
294
295int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
296	{
297	EVP_PKEY *pktmp;
298	int ret;
299	if(!a) return 0;
300	pktmp = EVP_PKEY_new();
301	if(!pktmp)
302		{
303		ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
304		return 0;
305		}
306	EVP_PKEY_set1_DSA(pktmp, a);
307	ret = i2d_PUBKEY(pktmp, pp);
308	EVP_PKEY_free(pktmp);
309	return ret;
310	}
311#endif
312
313#ifndef OPENSSL_NO_EC
314EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
315	{
316	EVP_PKEY *pkey;
317	EC_KEY *key;
318	const unsigned char *q;
319	q = *pp;
320	pkey = d2i_PUBKEY(NULL, &q, length);
321	if (!pkey) return(NULL);
322	key = EVP_PKEY_get1_EC_KEY(pkey);
323	EVP_PKEY_free(pkey);
324	if (!key)  return(NULL);
325	*pp = q;
326	if (a)
327		{
328		EC_KEY_free(*a);
329		*a = key;
330		}
331	return(key);
332	}
333
334int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
335	{
336	EVP_PKEY *pktmp;
337	int ret;
338	if (!a)	return(0);
339	if ((pktmp = EVP_PKEY_new()) == NULL)
340		{
341		ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
342		return(0);
343		}
344	EVP_PKEY_set1_EC_KEY(pktmp, a);
345	ret = i2d_PUBKEY(pktmp, pp);
346	EVP_PKEY_free(pktmp);
347	return(ret);
348	}
349#endif
350
351int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
352					int ptype, void *pval,
353					unsigned char *penc, int penclen)
354	{
355	if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
356		return 0;
357	if (penc)
358		{
359		if (pub->public_key->data)
360			OPENSSL_free(pub->public_key->data);
361		pub->public_key->data = penc;
362		pub->public_key->length = penclen;
363  		/* Set number of unused bits to zero */
364		pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
365		pub->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
366		}
367	return 1;
368	}
369
370int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
371		const unsigned char **pk, int *ppklen,
372		X509_ALGOR **pa,
373		X509_PUBKEY *pub)
374	{
375	if (ppkalg)
376		*ppkalg = pub->algor->algorithm;
377	if (pk)
378		{
379		*pk = pub->public_key->data;
380		*ppklen = pub->public_key->length;
381		}
382	if (pa)
383		*pa = pub->algor;
384	return 1;
385	}
386