e2517399335cc6f4225dde390f29764e491d48fe
[openssl.git] / crypto / asn1 / n_pkey.c
1 /* crypto/asn1/n_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 #ifndef OPENSSL_NO_RSA
62 #include <openssl/rsa.h>
63 #include <openssl/objects.h>
64 #include <openssl/asn1t.h>
65 #include <openssl/asn1_mac.h>
66 #include <openssl/evp.h>
67 #include <openssl/x509.h>
68
69
70 #ifndef OPENSSL_NO_RC4
71
72 typedef struct netscape_pkey_st
73         {
74         long version;
75         X509_ALGOR *algor;
76         ASN1_OCTET_STRING *private_key;
77         } NETSCAPE_PKEY;
78
79 typedef struct netscape_encrypted_pkey_st
80         {
81         ASN1_OCTET_STRING *os;
82         /* This is the same structure as DigestInfo so use it:
83          * although this isn't really anything to do with
84          * digests.
85          */
86         X509_SIG *enckey;
87         } NETSCAPE_ENCRYPTED_PKEY;
88
89
90 ASN1_BROKEN_SEQUENCE(NETSCAPE_ENCRYPTED_PKEY) = {
91         ASN1_SIMPLE(NETSCAPE_ENCRYPTED_PKEY, os, ASN1_OCTET_STRING),
92         ASN1_SIMPLE(NETSCAPE_ENCRYPTED_PKEY, enckey, X509_SIG)
93 } ASN1_BROKEN_SEQUENCE_END(NETSCAPE_ENCRYPTED_PKEY)
94
95 DECLARE_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
96 DECLARE_ASN1_ENCODE_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY,NETSCAPE_ENCRYPTED_PKEY)
97 IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
98
99 ASN1_SEQUENCE(NETSCAPE_PKEY) = {
100         ASN1_SIMPLE(NETSCAPE_PKEY, version, LONG),
101         ASN1_SIMPLE(NETSCAPE_PKEY, algor, X509_ALGOR),
102         ASN1_SIMPLE(NETSCAPE_PKEY, private_key, ASN1_OCTET_STRING)
103 } ASN1_SEQUENCE_END(NETSCAPE_PKEY)
104
105 DECLARE_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
106 DECLARE_ASN1_ENCODE_FUNCTIONS_const(NETSCAPE_PKEY,NETSCAPE_PKEY)
107 IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
108
109 static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
110                           int (*cb)(char *buf, int len, const char *prompt,
111                                     int verify),
112                           int sgckey);
113
114 int i2d_Netscape_RSA(const RSA *a, unsigned char **pp,
115                      int (*cb)(char *buf, int len, const char *prompt,
116                                int verify))
117 {
118         return i2d_RSA_NET(a, pp, cb, 0);
119 }
120
121 int i2d_RSA_NET(const RSA *a, unsigned char **pp,
122                 int (*cb)(char *buf, int len, const char *prompt, int verify),
123                 int sgckey)
124         {
125         int i, j, ret = 0;
126         int rsalen, pkeylen, olen;
127         NETSCAPE_PKEY *pkey = NULL;
128         NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
129         unsigned char buf[256],*zz;
130         unsigned char key[EVP_MAX_KEY_LENGTH];
131         EVP_CIPHER_CTX ctx;
132         EVP_CIPHER_CTX_init(&ctx);
133
134         if (a == NULL) return(0);
135
136         if ((pkey=NETSCAPE_PKEY_new()) == NULL) goto err;
137         if ((enckey=NETSCAPE_ENCRYPTED_PKEY_new()) == NULL) goto err;
138         pkey->version = 0;
139
140         pkey->algor->algorithm=OBJ_nid2obj(NID_rsaEncryption);
141         if ((pkey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
142         pkey->algor->parameter->type=V_ASN1_NULL;
143
144         rsalen = i2d_RSAPrivateKey(a, NULL);
145
146         /* Fake some octet strings just for the initial length
147          * calculation.
148          */
149
150         pkey->private_key->length=rsalen;
151
152         pkeylen=i2d_NETSCAPE_PKEY(pkey,NULL);
153
154         enckey->enckey->digest->length = pkeylen;
155
156         enckey->os->length = 11;        /* "private-key" */
157
158         enckey->enckey->algor->algorithm=OBJ_nid2obj(NID_rc4);
159         if ((enckey->enckey->algor->parameter=ASN1_TYPE_new()) == NULL) goto err;
160         enckey->enckey->algor->parameter->type=V_ASN1_NULL;
161
162         if (pp == NULL)
163                 {
164                 olen = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, NULL);
165                 NETSCAPE_PKEY_free(pkey);
166                 NETSCAPE_ENCRYPTED_PKEY_free(enckey);
167                 return olen;
168                 }
169
170
171         /* Since its RC4 encrypted length is actual length */
172         if ((zz=(unsigned char *)OPENSSL_malloc(rsalen)) == NULL)
173                 {
174                 ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
175                 goto err;
176                 }
177
178         pkey->private_key->data = zz;
179         /* Write out private key encoding */
180         i2d_RSAPrivateKey(a,&zz);
181
182         if ((zz=OPENSSL_malloc(pkeylen)) == NULL)
183                 {
184                 ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
185                 goto err;
186                 }
187
188         if (!ASN1_STRING_set(enckey->os, "private-key", -1)) 
189                 {
190                 ASN1err(ASN1_F_I2D_RSA_NET,ERR_R_MALLOC_FAILURE);
191                 goto err;
192                 }
193         enckey->enckey->digest->data = zz;
194         i2d_NETSCAPE_PKEY(pkey,&zz);
195
196         /* Wipe the private key encoding */
197         OPENSSL_cleanse(pkey->private_key->data, rsalen);
198                 
199         if (cb == NULL)
200                 cb=EVP_read_pw_string;
201         i=cb((char *)buf,256,"Enter Private Key password:",1);
202         if (i != 0)
203                 {
204                 ASN1err(ASN1_F_I2D_RSA_NET,ASN1_R_BAD_PASSWORD_READ);
205                 goto err;
206                 }
207         i = strlen((char *)buf);
208         /* If the key is used for SGC the algorithm is modified a little. */
209         if(sgckey) {
210                 if (!EVP_Digest(buf, i, buf, NULL, EVP_md5(), NULL))
211                         goto err;
212                 memcpy(buf + 16, "SGCKEYSALT", 10);
213                 i = 26;
214         }
215
216         if (!EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL))
217                 goto err;
218         OPENSSL_cleanse(buf,256);
219
220         /* Encrypt private key in place */
221         zz = enckey->enckey->digest->data;
222         if (!EVP_EncryptInit_ex(&ctx,EVP_rc4(),NULL,key,NULL))
223                 goto err;
224         if (!EVP_EncryptUpdate(&ctx,zz,&i,zz,pkeylen))
225                 goto err;
226         if (!EVP_EncryptFinal_ex(&ctx,zz + i,&j))
227                 goto err;
228
229         ret = i2d_NETSCAPE_ENCRYPTED_PKEY(enckey, pp);
230 err:
231         EVP_CIPHER_CTX_cleanup(&ctx);
232         NETSCAPE_ENCRYPTED_PKEY_free(enckey);
233         NETSCAPE_PKEY_free(pkey);
234         return(ret);
235         }
236
237
238 RSA *d2i_Netscape_RSA(RSA **a, const unsigned char **pp, long length,
239                       int (*cb)(char *buf, int len, const char *prompt,
240                                 int verify))
241 {
242         return d2i_RSA_NET(a, pp, length, cb, 0);
243 }
244
245 RSA *d2i_RSA_NET(RSA **a, const unsigned char **pp, long length,
246                  int (*cb)(char *buf, int len, const char *prompt, int verify),
247                  int sgckey)
248         {
249         RSA *ret=NULL;
250         const unsigned char *p;
251         NETSCAPE_ENCRYPTED_PKEY *enckey = NULL;
252
253         p = *pp;
254
255         enckey = d2i_NETSCAPE_ENCRYPTED_PKEY(NULL, &p, length);
256         if(!enckey) {
257                 ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_DECODING_ERROR);
258                 return NULL;
259         }
260
261         if ((enckey->os->length != 11) || (strncmp("private-key",
262                 (char *)enckey->os->data,11) != 0))
263                 {
264                 ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_PRIVATE_KEY_HEADER_MISSING);
265                 NETSCAPE_ENCRYPTED_PKEY_free(enckey);
266                 return NULL;
267                 }
268         if (OBJ_obj2nid(enckey->enckey->algor->algorithm) != NID_rc4)
269                 {
270                 ASN1err(ASN1_F_D2I_RSA_NET,ASN1_R_UNSUPPORTED_ENCRYPTION_ALGORITHM);
271                 goto err;
272         }
273         if (cb == NULL)
274                 cb=EVP_read_pw_string;
275         if ((ret=d2i_RSA_NET_2(a, enckey->enckey->digest,cb, sgckey)) == NULL) goto err;
276
277         *pp = p;
278
279         err:
280         NETSCAPE_ENCRYPTED_PKEY_free(enckey);
281         return ret;
282
283         }
284
285 static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
286                           int (*cb)(char *buf, int len, const char *prompt,
287                                     int verify), int sgckey)
288         {
289         NETSCAPE_PKEY *pkey=NULL;
290         RSA *ret=NULL;
291         int i,j;
292         unsigned char buf[256];
293         const unsigned char *zz;
294         unsigned char key[EVP_MAX_KEY_LENGTH];
295         EVP_CIPHER_CTX ctx;
296         EVP_CIPHER_CTX_init(&ctx);
297
298         i=cb((char *)buf,256,"Enter Private Key password:",0);
299         if (i != 0)
300                 {
301                 ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_BAD_PASSWORD_READ);
302                 goto err;
303                 }
304
305         i = strlen((char *)buf);
306         if(sgckey){
307                 if (!EVP_Digest(buf, i, buf, NULL, EVP_md5(), NULL))
308                         goto err;
309                 memcpy(buf + 16, "SGCKEYSALT", 10);
310                 i = 26;
311         }
312                 
313         if (!EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL))
314                 goto err;
315         OPENSSL_cleanse(buf,256);
316
317         if (!EVP_DecryptInit_ex(&ctx,EVP_rc4(),NULL, key,NULL))
318                 goto err;
319         if (!EVP_DecryptUpdate(&ctx,os->data,&i,os->data,os->length))
320                 goto err;
321         if (!EVP_DecryptFinal_ex(&ctx,&(os->data[i]),&j))
322                 goto err;
323         os->length=i+j;
324
325         zz=os->data;
326
327         if ((pkey=d2i_NETSCAPE_PKEY(NULL,&zz,os->length)) == NULL)
328                 {
329                 ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_UNABLE_TO_DECODE_RSA_PRIVATE_KEY);
330                 goto err;
331                 }
332                 
333         zz=pkey->private_key->data;
334         if ((ret=d2i_RSAPrivateKey(a,&zz,pkey->private_key->length)) == NULL)
335                 {
336                 ASN1err(ASN1_F_D2I_RSA_NET_2,ASN1_R_UNABLE_TO_DECODE_RSA_KEY);
337                 goto err;
338                 }
339 err:
340         EVP_CIPHER_CTX_cleanup(&ctx);
341         NETSCAPE_PKEY_free(pkey);
342         return(ret);
343         }
344
345 #endif /* OPENSSL_NO_RC4 */
346
347 #else /* !OPENSSL_NO_RSA */
348
349 # if PEDANTIC
350 static void *dummy=&dummy;
351 # endif
352
353 #endif