pem_pkey.c revision 337982 
1/* crypto/pem/pem_pkey.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/buffer.h>
62#include <openssl/objects.h>
63#include <openssl/evp.h>
64#include <openssl/rand.h>
65#include <openssl/x509.h>
66#include <openssl/pkcs12.h>
67#include <openssl/pem.h>
68#ifndef OPENSSL_NO_ENGINE
69# include <openssl/engine.h>
70#endif
71#ifndef OPENSSL_NO_DH
72# include <openssl/dh.h>
73#endif
74#include "asn1_locl.h"
75
76int pem_check_suffix(const char *pem_str, const char *suffix);
77
78EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
79                                  void *u)
80{
81    char *nm = NULL;
82    const unsigned char *p = NULL;
83    unsigned char *data = NULL;
84    long len;
85    int slen;
86    EVP_PKEY *ret = NULL;
87
88    if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_EVP_PKEY, bp, cb, u))
89        return NULL;
90    p = data;
91
92    if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) {
93        PKCS8_PRIV_KEY_INFO *p8inf;
94        p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len);
95        if (!p8inf)
96            goto p8err;
97        ret = EVP_PKCS82PKEY(p8inf);
98        if (x) {
99            if (*x)
100                EVP_PKEY_free((EVP_PKEY *)*x);
101            *x = ret;
102        }
103        PKCS8_PRIV_KEY_INFO_free(p8inf);
104    } else if (strcmp(nm, PEM_STRING_PKCS8) == 0) {
105        PKCS8_PRIV_KEY_INFO *p8inf;
106        X509_SIG *p8;
107        int klen;
108        char psbuf[PEM_BUFSIZE];
109        p8 = d2i_X509_SIG(NULL, &p, len);
110        if (!p8)
111            goto p8err;
112        if (cb)
113            klen = cb(psbuf, PEM_BUFSIZE, 0, u);
114        else
115            klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
116        if (klen < 0) {
117            PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY, PEM_R_BAD_PASSWORD_READ);
118            X509_SIG_free(p8);
119            goto err;
120        }
121        p8inf = PKCS8_decrypt(p8, psbuf, klen);
122        X509_SIG_free(p8);
123        OPENSSL_cleanse(psbuf, klen);
124        if (!p8inf)
125            goto p8err;
126        ret = EVP_PKCS82PKEY(p8inf);
127        if (x) {
128            if (*x)
129                EVP_PKEY_free((EVP_PKEY *)*x);
130            *x = ret;
131        }
132        PKCS8_PRIV_KEY_INFO_free(p8inf);
133    } else if ((slen = pem_check_suffix(nm, "PRIVATE KEY")) > 0) {
134        const EVP_PKEY_ASN1_METHOD *ameth;
135        ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
136        if (!ameth || !ameth->old_priv_decode)
137            goto p8err;
138        ret = d2i_PrivateKey(ameth->pkey_id, x, &p, len);
139    }
140 p8err:
141    if (ret == NULL)
142        PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY, ERR_R_ASN1_LIB);
143 err:
144    OPENSSL_free(nm);
145    OPENSSL_cleanse(data, len);
146    OPENSSL_free(data);
147    return (ret);
148}
149
150int PEM_write_bio_PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc,
151                             unsigned char *kstr, int klen,
152                             pem_password_cb *cb, void *u)
153{
154    char pem_str[80];
155    if (!x->ameth || x->ameth->priv_encode)
156        return PEM_write_bio_PKCS8PrivateKey(bp, x, enc,
157                                             (char *)kstr, klen, cb, u);
158
159    BIO_snprintf(pem_str, 80, "%s PRIVATE KEY", x->ameth->pem_str);
160    return PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,
161                              pem_str, bp, x, enc, kstr, klen, cb, u);
162}
163
164EVP_PKEY *PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)
165{
166    char *nm = NULL;
167    const unsigned char *p = NULL;
168    unsigned char *data = NULL;
169    long len;
170    int slen;
171    EVP_PKEY *ret = NULL;
172
173    if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_PARAMETERS,
174                            bp, 0, NULL))
175        return NULL;
176    p = data;
177
178    if ((slen = pem_check_suffix(nm, "PARAMETERS")) > 0) {
179        ret = EVP_PKEY_new();
180        if (!ret)
181            goto err;
182        if (!EVP_PKEY_set_type_str(ret, nm, slen)
183            || !ret->ameth->param_decode
184            || !ret->ameth->param_decode(ret, &p, len)) {
185            EVP_PKEY_free(ret);
186            ret = NULL;
187            goto err;
188        }
189        if (x) {
190            if (*x)
191                EVP_PKEY_free((EVP_PKEY *)*x);
192            *x = ret;
193        }
194    }
195 err:
196    if (ret == NULL)
197        PEMerr(PEM_F_PEM_READ_BIO_PARAMETERS, ERR_R_ASN1_LIB);
198    OPENSSL_free(nm);
199    OPENSSL_free(data);
200    return (ret);
201}
202
203int PEM_write_bio_Parameters(BIO *bp, EVP_PKEY *x)
204{
205    char pem_str[80];
206    if (!x->ameth || !x->ameth->param_encode)
207        return 0;
208
209    BIO_snprintf(pem_str, 80, "%s PARAMETERS", x->ameth->pem_str);
210    return PEM_ASN1_write_bio((i2d_of_void *)x->ameth->param_encode,
211                              pem_str, bp, x, NULL, NULL, 0, 0, NULL);
212}
213
214#ifndef OPENSSL_NO_FP_API
215EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
216                              void *u)
217{
218    BIO *b;
219    EVP_PKEY *ret;
220
221    if ((b = BIO_new(BIO_s_file())) == NULL) {
222        PEMerr(PEM_F_PEM_READ_PRIVATEKEY, ERR_R_BUF_LIB);
223        return (0);
224    }
225    BIO_set_fp(b, fp, BIO_NOCLOSE);
226    ret = PEM_read_bio_PrivateKey(b, x, cb, u);
227    BIO_free(b);
228    return (ret);
229}
230
231int PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
232                         unsigned char *kstr, int klen,
233                         pem_password_cb *cb, void *u)
234{
235    BIO *b;
236    int ret;
237
238    if ((b = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
239        PEMerr(PEM_F_PEM_WRITE_PRIVATEKEY, ERR_R_BUF_LIB);
240        return 0;
241    }
242    ret = PEM_write_bio_PrivateKey(b, x, enc, kstr, klen, cb, u);
243    BIO_free(b);
244    return ret;
245}
246
247#endif
248
249#ifndef OPENSSL_NO_DH
250
251/* Transparently read in PKCS#3 or X9.42 DH parameters */
252
253DH *PEM_read_bio_DHparams(BIO *bp, DH **x, pem_password_cb *cb, void *u)
254{
255    char *nm = NULL;
256    const unsigned char *p = NULL;
257    unsigned char *data = NULL;
258    long len;
259    DH *ret = NULL;
260
261    if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_DHPARAMS, bp, cb, u))
262        return NULL;
263    p = data;
264
265    if (!strcmp(nm, PEM_STRING_DHXPARAMS))
266        ret = d2i_DHxparams(x, &p, len);
267    else
268        ret = d2i_DHparams(x, &p, len);
269
270    if (ret == NULL)
271        PEMerr(PEM_F_PEM_READ_BIO_DHPARAMS, ERR_R_ASN1_LIB);
272    OPENSSL_free(nm);
273    OPENSSL_free(data);
274    return ret;
275}
276
277# ifndef OPENSSL_NO_FP_API
278DH *PEM_read_DHparams(FILE *fp, DH **x, pem_password_cb *cb, void *u)
279{
280    BIO *b;
281    DH *ret;
282
283    if ((b = BIO_new(BIO_s_file())) == NULL) {
284        PEMerr(PEM_F_PEM_READ_DHPARAMS, ERR_R_BUF_LIB);
285        return (0);
286    }
287    BIO_set_fp(b, fp, BIO_NOCLOSE);
288    ret = PEM_read_bio_DHparams(b, x, cb, u);
289    BIO_free(b);
290    return (ret);
291}
292# endif
293
294#endif
295