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
72typedef struct netscape_pkey_st
73	{
74	long version;
75	X509_ALGOR *algor;
76	ASN1_OCTET_STRING *private_key;
77	} NETSCAPE_PKEY;
78
79typedef 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
90ASN1_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
95DECLARE_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
96DECLARE_ASN1_ENCODE_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY,NETSCAPE_ENCRYPTED_PKEY)
97IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_ENCRYPTED_PKEY)
98
99ASN1_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
105DECLARE_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
106DECLARE_ASN1_ENCODE_FUNCTIONS_const(NETSCAPE_PKEY,NETSCAPE_PKEY)
107IMPLEMENT_ASN1_FUNCTIONS_const(NETSCAPE_PKEY)
108
109static 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
114int 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
121int 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);
230err:
231	EVP_CIPHER_CTX_cleanup(&ctx);
232	NETSCAPE_ENCRYPTED_PKEY_free(enckey);
233	NETSCAPE_PKEY_free(pkey);
234	return(ret);
235	}
236
237
238RSA *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
245RSA *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
285static 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		}
339err:
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
350static void *dummy=&dummy;
351# endif
352
353#endif
354