x_pubkey.c revision 291721 
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    const unsigned char *q;
192    q = *pp;
193    xpk = d2i_X509_PUBKEY(NULL, &q, length);
194    if (!xpk)
195        return NULL;
196    pktmp = X509_PUBKEY_get(xpk);
197    X509_PUBKEY_free(xpk);
198    if (!pktmp)
199        return NULL;
200    *pp = q;
201    if (a) {
202        EVP_PKEY_free(*a);
203        *a = pktmp;
204    }
205    return pktmp;
206}
207
208int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
209{
210    X509_PUBKEY *xpk = NULL;
211    int ret;
212    if (!a)
213        return 0;
214    if (!X509_PUBKEY_set(&xpk, a))
215        return 0;
216    ret = i2d_X509_PUBKEY(xpk, pp);
217    X509_PUBKEY_free(xpk);
218    return ret;
219}
220
221/*
222 * The following are equivalents but which return RSA and DSA keys
223 */
224#ifndef OPENSSL_NO_RSA
225RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
226{
227    EVP_PKEY *pkey;
228    RSA *key;
229    const unsigned char *q;
230    q = *pp;
231    pkey = d2i_PUBKEY(NULL, &q, length);
232    if (!pkey)
233        return NULL;
234    key = EVP_PKEY_get1_RSA(pkey);
235    EVP_PKEY_free(pkey);
236    if (!key)
237        return NULL;
238    *pp = q;
239    if (a) {
240        RSA_free(*a);
241        *a = key;
242    }
243    return key;
244}
245
246int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
247{
248    EVP_PKEY *pktmp;
249    int ret;
250    if (!a)
251        return 0;
252    pktmp = EVP_PKEY_new();
253    if (!pktmp) {
254        ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
255        return 0;
256    }
257    EVP_PKEY_set1_RSA(pktmp, a);
258    ret = i2d_PUBKEY(pktmp, pp);
259    EVP_PKEY_free(pktmp);
260    return ret;
261}
262#endif
263
264#ifndef OPENSSL_NO_DSA
265DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
266{
267    EVP_PKEY *pkey;
268    DSA *key;
269    const unsigned char *q;
270    q = *pp;
271    pkey = d2i_PUBKEY(NULL, &q, length);
272    if (!pkey)
273        return NULL;
274    key = EVP_PKEY_get1_DSA(pkey);
275    EVP_PKEY_free(pkey);
276    if (!key)
277        return NULL;
278    *pp = q;
279    if (a) {
280        DSA_free(*a);
281        *a = key;
282    }
283    return key;
284}
285
286int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
287{
288    EVP_PKEY *pktmp;
289    int ret;
290    if (!a)
291        return 0;
292    pktmp = EVP_PKEY_new();
293    if (!pktmp) {
294        ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
295        return 0;
296    }
297    EVP_PKEY_set1_DSA(pktmp, a);
298    ret = i2d_PUBKEY(pktmp, pp);
299    EVP_PKEY_free(pktmp);
300    return ret;
301}
302#endif
303
304#ifndef OPENSSL_NO_EC
305EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
306{
307    EVP_PKEY *pkey;
308    EC_KEY *key;
309    const unsigned char *q;
310    q = *pp;
311    pkey = d2i_PUBKEY(NULL, &q, length);
312    if (!pkey)
313        return (NULL);
314    key = EVP_PKEY_get1_EC_KEY(pkey);
315    EVP_PKEY_free(pkey);
316    if (!key)
317        return (NULL);
318    *pp = q;
319    if (a) {
320        EC_KEY_free(*a);
321        *a = key;
322    }
323    return (key);
324}
325
326int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
327{
328    EVP_PKEY *pktmp;
329    int ret;
330    if (!a)
331        return (0);
332    if ((pktmp = EVP_PKEY_new()) == NULL) {
333        ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
334        return (0);
335    }
336    EVP_PKEY_set1_EC_KEY(pktmp, a);
337    ret = i2d_PUBKEY(pktmp, pp);
338    EVP_PKEY_free(pktmp);
339    return (ret);
340}
341#endif
342
343int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
344                           int ptype, void *pval,
345                           unsigned char *penc, int penclen)
346{
347    if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
348        return 0;
349    if (penc) {
350        if (pub->public_key->data)
351            OPENSSL_free(pub->public_key->data);
352        pub->public_key->data = penc;
353        pub->public_key->length = penclen;
354        /* Set number of unused bits to zero */
355        pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
356        pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
357    }
358    return 1;
359}
360
361int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
362                           const unsigned char **pk, int *ppklen,
363                           X509_ALGOR **pa, X509_PUBKEY *pub)
364{
365    if (ppkalg)
366        *ppkalg = pub->algor->algorithm;
367    if (pk) {
368        *pk = pub->public_key->data;
369        *ppklen = pub->public_key->length;
370    }
371    if (pa)
372        *pa = pub->algor;
373    return 1;
374}
375