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1 /*
2 * PKCS#12 Personal Information Exchange Syntax
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: GPL-2.0
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * This file is part of mbed TLS (https://tls.mbed.org)
22 */
23 /*
24 * The PKCS #12 Personal Information Exchange Syntax Standard v1.1
25 *
26 * http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
27 * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
28 */
29
30 #if !defined(MBEDTLS_CONFIG_FILE)
31 #include "mbedtls/config.h"
32 #else
33 #include MBEDTLS_CONFIG_FILE
34 #endif
35
36 #if defined(MBEDTLS_PKCS12_C)
37
38 #include "mbedtls/pkcs12.h"
39 #include "mbedtls/asn1.h"
40 #include "mbedtls/cipher.h"
41 #include "mbedtls/platform_util.h"
42
43 #include <string.h>
44
45 #if defined(MBEDTLS_ARC4_C)
46 #include "mbedtls/arc4.h"
47 #endif
48
49 #if defined(MBEDTLS_DES_C)
50 #include "mbedtls/des.h"
51 #endif
52
53 static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params,
54 mbedtls_asn1_buf *salt, int *iterations )
55 {
56 int ret;
57 unsigned char **p = &params->p;
58 const unsigned char *end = params->p + params->len;
59
60 /*
61 * pkcs-12PbeParams ::= SEQUENCE {
62 * salt OCTET STRING,
63 * iterations INTEGER
64 * }
65 *
66 */
67 if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
68 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
69 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
70
71 if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
72 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
73
74 salt->p = *p;
75 *p += salt->len;
76
77 if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )
78 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
79
80 if( *p != end )
81 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
82 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
83
84 return( 0 );
85 }
86
87 #define PKCS12_MAX_PWDLEN 128
88
89 static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
90 const unsigned char *pwd, size_t pwdlen,
91 unsigned char *key, size_t keylen,
92 unsigned char *iv, size_t ivlen )
93 {
94 int ret, iterations = 0;
95 mbedtls_asn1_buf salt;
96 size_t i;
97 unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
98
99 if( pwdlen > PKCS12_MAX_PWDLEN )
100 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
101
102 memset( &salt, 0, sizeof(mbedtls_asn1_buf) );
103 memset( &unipwd, 0, sizeof(unipwd) );
104
105 if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt,
106 &iterations ) ) != 0 )
107 return( ret );
108
109 for( i = 0; i < pwdlen; i++ )
110 unipwd[i * 2 + 1] = pwd[i];
111
112 if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
113 salt.p, salt.len, md_type,
114 MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 )
115 {
116 return( ret );
117 }
118
119 if( iv == NULL || ivlen == 0 )
120 return( 0 );
121
122 if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
123 salt.p, salt.len, md_type,
124 MBEDTLS_PKCS12_DERIVE_IV, iterations ) ) != 0 )
125 {
126 return( ret );
127 }
128 return( 0 );
129 }
130
131 #undef PKCS12_MAX_PWDLEN
132
133 int mbedtls_pkcs12_pbe_sha1_rc4_128( mbedtls_asn1_buf *pbe_params, int mode,
134 const unsigned char *pwd, size_t pwdlen,
135 const unsigned char *data, size_t len,
136 unsigned char *output )
137 {
138 #if !defined(MBEDTLS_ARC4_C)
139 ((void) pbe_params);
140 ((void) mode);
141 ((void) pwd);
142 ((void) pwdlen);
143 ((void) data);
144 ((void) len);
145 ((void) output);
146 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
147 #else
148 int ret;
149 unsigned char key[16];
150 mbedtls_arc4_context ctx;
151 ((void) mode);
152
153 mbedtls_arc4_init( &ctx );
154
155 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,
156 pwd, pwdlen,
157 key, 16, NULL, 0 ) ) != 0 )
158 {
159 return( ret );
160 }
161
162 mbedtls_arc4_setup( &ctx, key, 16 );
163 if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )
164 goto exit;
165
166 exit:
167 mbedtls_platform_zeroize( key, sizeof( key ) );
168 mbedtls_arc4_free( &ctx );
169
170 return( ret );
171 #endif /* MBEDTLS_ARC4_C */
172 }
173
174 int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,
175 mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
176 const unsigned char *pwd, size_t pwdlen,
177 const unsigned char *data, size_t len,
178 unsigned char *output )
179 {
180 int ret, keylen = 0;
181 unsigned char key[32];
182 unsigned char iv[16];
183 const mbedtls_cipher_info_t *cipher_info;
184 mbedtls_cipher_context_t cipher_ctx;
185 size_t olen = 0;
186
187 cipher_info = mbedtls_cipher_info_from_type( cipher_type );
188 if( cipher_info == NULL )
189 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
190
191 keylen = cipher_info->key_bitlen / 8;
192
193 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
194 key, keylen,
195 iv, cipher_info->iv_size ) ) != 0 )
196 {
197 return( ret );
198 }
199
200 mbedtls_cipher_init( &cipher_ctx );
201
202 if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
203 goto exit;
204
205 if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
206 goto exit;
207
208 if( ( ret = mbedtls_cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
209 goto exit;
210
211 if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 )
212 goto exit;
213
214 if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,
215 output, &olen ) ) != 0 )
216 {
217 goto exit;
218 }
219
220 if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
221 ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
222
223 exit:
224 mbedtls_platform_zeroize( key, sizeof( key ) );
225 mbedtls_platform_zeroize( iv, sizeof( iv ) );
226 mbedtls_cipher_free( &cipher_ctx );
227
228 return( ret );
229 }
230
231 static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
232 const unsigned char *filler, size_t fill_len )
233 {
234 unsigned char *p = data;
235 size_t use_len;
236
237 while( data_len > 0 )
238 {
239 use_len = ( data_len > fill_len ) ? fill_len : data_len;
240 memcpy( p, filler, use_len );
241 p += use_len;
242 data_len -= use_len;
243 }
244 }
245
246 int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
247 const unsigned char *pwd, size_t pwdlen,
248 const unsigned char *salt, size_t saltlen,
249 mbedtls_md_type_t md_type, int id, int iterations )
250 {
251 int ret;
252 unsigned int j;
253
254 unsigned char diversifier[128];
255 unsigned char salt_block[128], pwd_block[128], hash_block[128];
256 unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
257 unsigned char *p;
258 unsigned char c;
259
260 size_t hlen, use_len, v, i;
261
262 const mbedtls_md_info_t *md_info;
263 mbedtls_md_context_t md_ctx;
264
265 // This version only allows max of 64 bytes of password or salt
266 if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
267 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
268
269 md_info = mbedtls_md_info_from_type( md_type );
270 if( md_info == NULL )
271 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
272
273 mbedtls_md_init( &md_ctx );
274
275 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
276 return( ret );
277 hlen = mbedtls_md_get_size( md_info );
278
279 if( hlen <= 32 )
280 v = 64;
281 else
282 v = 128;
283
284 memset( diversifier, (unsigned char) id, v );
285
286 pkcs12_fill_buffer( salt_block, v, salt, saltlen );
287 pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
288
289 p = data;
290 while( datalen > 0 )
291 {
292 // Calculate hash( diversifier || salt_block || pwd_block )
293 if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 )
294 goto exit;
295
296 if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
297 goto exit;
298
299 if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )
300 goto exit;
301
302 if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )
303 goto exit;
304
305 if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
306 goto exit;
307
308 // Perform remaining ( iterations - 1 ) recursive hash calculations
309 for( i = 1; i < (size_t) iterations; i++ )
310 {
311 if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 )
312 goto exit;
313 }
314
315 use_len = ( datalen > hlen ) ? hlen : datalen;
316 memcpy( p, hash_output, use_len );
317 datalen -= use_len;
318 p += use_len;
319
320 if( datalen == 0 )
321 break;
322
323 // Concatenating copies of hash_output into hash_block (B)
324 pkcs12_fill_buffer( hash_block, v, hash_output, hlen );
325
326 // B += 1
327 for( i = v; i > 0; i-- )
328 if( ++hash_block[i - 1] != 0 )
329 break;
330
331 // salt_block += B
332 c = 0;
333 for( i = v; i > 0; i-- )
334 {
335 j = salt_block[i - 1] + hash_block[i - 1] + c;
336 c = (unsigned char) (j >> 8);
337 salt_block[i - 1] = j & 0xFF;
338 }
339
340 // pwd_block += B
341 c = 0;
342 for( i = v; i > 0; i-- )
343 {
344 j = pwd_block[i - 1] + hash_block[i - 1] + c;
345 c = (unsigned char) (j >> 8);
346 pwd_block[i - 1] = j & 0xFF;
347 }
348 }
349
350 ret = 0;
351
352 exit:
353 mbedtls_platform_zeroize( salt_block, sizeof( salt_block ) );
354 mbedtls_platform_zeroize( pwd_block, sizeof( pwd_block ) );
355 mbedtls_platform_zeroize( hash_block, sizeof( hash_block ) );
356 mbedtls_platform_zeroize( hash_output, sizeof( hash_output ) );
357
358 mbedtls_md_free( &md_ctx );
359
360 return( ret );
361 }
362
363 #endif /* MBEDTLS_PKCS12_C */
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