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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 */
pubkey_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)72 static 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 
83 ASN1_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 
88 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
89 
90 int 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;
128 error:
129 	if (pk != NULL) X509_PUBKEY_free(pk);
130 	return 0;
131 	}
132 
X509_PUBKEY_get(X509_PUBKEY * key)133 EVP_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 
d2i_PUBKEY(EVP_PKEY ** a,const unsigned char ** pp,long length)201 EVP_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 
i2d_PUBKEY(EVP_PKEY * a,unsigned char ** pp)219 int 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
d2i_RSA_PUBKEY(RSA ** a,const unsigned char ** pp,long length)234 RSA *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 
i2d_RSA_PUBKEY(RSA * a,unsigned char ** pp)255 int 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
d2i_DSA_PUBKEY(DSA ** a,const unsigned char ** pp,long length)274 DSA *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 
i2d_DSA_PUBKEY(DSA * a,unsigned char ** pp)295 int 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
d2i_EC_PUBKEY(EC_KEY ** a,const unsigned char ** pp,long length)314 EC_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 
i2d_EC_PUBKEY(EC_KEY * a,unsigned char ** pp)334 int 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 
X509_PUBKEY_set0_param(X509_PUBKEY * pub,ASN1_OBJECT * aobj,int ptype,void * pval,unsigned char * penc,int penclen)351 int 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 
X509_PUBKEY_get0_param(ASN1_OBJECT ** ppkalg,const unsigned char ** pk,int * ppklen,X509_ALGOR ** pa,X509_PUBKEY * pub)370 int 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