x_pubkey.c revision 296341 
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        X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
77        EVP_PKEY_free(pubkey->pkey);
78    }
79    return 1;
80}
81
82ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
83        ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
84        ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
85} ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
86
87IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
88
89int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
90{
91    X509_PUBKEY *pk = NULL;
92
93    if (x == NULL)
94        return (0);
95
96    if ((pk = X509_PUBKEY_new()) == NULL)
97        goto error;
98
99    if (pkey->ameth) {
100        if (pkey->ameth->pub_encode) {
101            if (!pkey->ameth->pub_encode(pk, pkey)) {
102                X509err(X509_F_X509_PUBKEY_SET,
103                        X509_R_PUBLIC_KEY_ENCODE_ERROR);
104                goto error;
105            }
106        } else {
107            X509err(X509_F_X509_PUBKEY_SET, X509_R_METHOD_NOT_SUPPORTED);
108            goto error;
109        }
110    } else {
111        X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
112        goto error;
113    }
114
115    if (*x != NULL)
116        X509_PUBKEY_free(*x);
117
118    *x = pk;
119
120    return 1;
121 error:
122    if (pk != NULL)
123        X509_PUBKEY_free(pk);
124    return 0;
125}
126
127EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
128{
129    EVP_PKEY *ret = NULL;
130
131    if (key == NULL)
132        goto error;
133
134    if (key->pkey != NULL) {
135        CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
136        return key->pkey;
137    }
138
139    if (key->public_key == NULL)
140        goto error;
141
142    if ((ret = EVP_PKEY_new()) == NULL) {
143        X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
144        goto error;
145    }
146
147    if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm))) {
148        X509err(X509_F_X509_PUBKEY_GET, X509_R_UNSUPPORTED_ALGORITHM);
149        goto error;
150    }
151
152    if (ret->ameth->pub_decode) {
153        if (!ret->ameth->pub_decode(ret, key)) {
154            X509err(X509_F_X509_PUBKEY_GET, X509_R_PUBLIC_KEY_DECODE_ERROR);
155            goto error;
156        }
157    } else {
158        X509err(X509_F_X509_PUBKEY_GET, X509_R_METHOD_NOT_SUPPORTED);
159        goto error;
160    }
161
162    /* Check to see if another thread set key->pkey first */
163    CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY);
164    if (key->pkey) {
165        CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
166        EVP_PKEY_free(ret);
167        ret = key->pkey;
168    } else {
169        key->pkey = ret;
170        CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
171    }
172    CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
173
174    return ret;
175
176 error:
177    if (ret != NULL)
178        EVP_PKEY_free(ret);
179    return (NULL);
180}
181
182/*
183 * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
184 * decode as X509_PUBKEY
185 */
186
187EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
188{
189    X509_PUBKEY *xpk;
190    EVP_PKEY *pktmp;
191    xpk = d2i_X509_PUBKEY(NULL, pp, length);
192    if (!xpk)
193        return NULL;
194    pktmp = X509_PUBKEY_get(xpk);
195    X509_PUBKEY_free(xpk);
196    if (!pktmp)
197        return NULL;
198    if (a) {
199        EVP_PKEY_free(*a);
200        *a = pktmp;
201    }
202    return pktmp;
203}
204
205int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
206{
207    X509_PUBKEY *xpk = NULL;
208    int ret;
209    if (!a)
210        return 0;
211    if (!X509_PUBKEY_set(&xpk, a))
212        return 0;
213    ret = i2d_X509_PUBKEY(xpk, pp);
214    X509_PUBKEY_free(xpk);
215    return ret;
216}
217
218/*
219 * The following are equivalents but which return RSA and DSA keys
220 */
221#ifndef OPENSSL_NO_RSA
222RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
223{
224    EVP_PKEY *pkey;
225    RSA *key;
226    const unsigned char *q;
227    q = *pp;
228    pkey = d2i_PUBKEY(NULL, &q, length);
229    if (!pkey)
230        return NULL;
231    key = EVP_PKEY_get1_RSA(pkey);
232    EVP_PKEY_free(pkey);
233    if (!key)
234        return NULL;
235    *pp = q;
236    if (a) {
237        RSA_free(*a);
238        *a = key;
239    }
240    return key;
241}
242
243int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
244{
245    EVP_PKEY *pktmp;
246    int ret;
247    if (!a)
248        return 0;
249    pktmp = EVP_PKEY_new();
250    if (!pktmp) {
251        ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
252        return 0;
253    }
254    EVP_PKEY_set1_RSA(pktmp, a);
255    ret = i2d_PUBKEY(pktmp, pp);
256    EVP_PKEY_free(pktmp);
257    return ret;
258}
259#endif
260
261#ifndef OPENSSL_NO_DSA
262DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
263{
264    EVP_PKEY *pkey;
265    DSA *key;
266    const unsigned char *q;
267    q = *pp;
268    pkey = d2i_PUBKEY(NULL, &q, length);
269    if (!pkey)
270        return NULL;
271    key = EVP_PKEY_get1_DSA(pkey);
272    EVP_PKEY_free(pkey);
273    if (!key)
274        return NULL;
275    *pp = q;
276    if (a) {
277        DSA_free(*a);
278        *a = key;
279    }
280    return key;
281}
282
283int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
284{
285    EVP_PKEY *pktmp;
286    int ret;
287    if (!a)
288        return 0;
289    pktmp = EVP_PKEY_new();
290    if (!pktmp) {
291        ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
292        return 0;
293    }
294    EVP_PKEY_set1_DSA(pktmp, a);
295    ret = i2d_PUBKEY(pktmp, pp);
296    EVP_PKEY_free(pktmp);
297    return ret;
298}
299#endif
300
301#ifndef OPENSSL_NO_EC
302EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
303{
304    EVP_PKEY *pkey;
305    EC_KEY *key;
306    const unsigned char *q;
307    q = *pp;
308    pkey = d2i_PUBKEY(NULL, &q, length);
309    if (!pkey)
310        return (NULL);
311    key = EVP_PKEY_get1_EC_KEY(pkey);
312    EVP_PKEY_free(pkey);
313    if (!key)
314        return (NULL);
315    *pp = q;
316    if (a) {
317        EC_KEY_free(*a);
318        *a = key;
319    }
320    return (key);
321}
322
323int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
324{
325    EVP_PKEY *pktmp;
326    int ret;
327    if (!a)
328        return (0);
329    if ((pktmp = EVP_PKEY_new()) == NULL) {
330        ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
331        return (0);
332    }
333    EVP_PKEY_set1_EC_KEY(pktmp, a);
334    ret = i2d_PUBKEY(pktmp, pp);
335    EVP_PKEY_free(pktmp);
336    return (ret);
337}
338#endif
339
340int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
341                           int ptype, void *pval,
342                           unsigned char *penc, int penclen)
343{
344    if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
345        return 0;
346    if (penc) {
347        if (pub->public_key->data)
348            OPENSSL_free(pub->public_key->data);
349        pub->public_key->data = penc;
350        pub->public_key->length = penclen;
351        /* Set number of unused bits to zero */
352        pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
353        pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
354    }
355    return 1;
356}
357
358int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
359                           const unsigned char **pk, int *ppklen,
360                           X509_ALGOR **pa, X509_PUBKEY *pub)
361{
362    if (ppkalg)
363        *ppkalg = pub->algor->algorithm;
364    if (pk) {
365        *pk = pub->public_key->data;
366        *ppklen = pub->public_key->length;
367    }
368    if (pa)
369        *pa = pub->algor;
370    return 1;
371}
372