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1 /**
2 * \file pkcs5.c
3 *
4 * \brief PKCS#5 functions
5 *
6 * \author Mathias Olsson <mathias@kompetensum.com>
7 *
8 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
9 * SPDX-License-Identifier: GPL-2.0
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * This file is part of mbed TLS (https://tls.mbed.org)
26 */
27 /*
28 * PKCS#5 includes PBKDF2 and more
29 *
30 * http://tools.ietf.org/html/rfc2898 (Specification)
31 * http://tools.ietf.org/html/rfc6070 (Test vectors)
32 */
33
34 #if !defined(MBEDTLS_CONFIG_FILE)
35 #include "mbedtls/config.h"
36 #else
37 #include MBEDTLS_CONFIG_FILE
38 #endif
39
40 #if defined(MBEDTLS_PKCS5_C)
41
42 #include "mbedtls/pkcs5.h"
43
44 #if defined(MBEDTLS_ASN1_PARSE_C)
45 #include "mbedtls/asn1.h"
46 #include "mbedtls/cipher.h"
47 #include "mbedtls/oid.h"
48 #endif /* MBEDTLS_ASN1_PARSE_C */
49
50 #include <string.h>
51
52 #if defined(MBEDTLS_PLATFORM_C)
53 #include "mbedtls/platform.h"
54 #else
55 #include <stdio.h>
56 #define mbedtls_printf printf
57 #endif
58
59 #if !defined(MBEDTLS_ASN1_PARSE_C)
60 int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
61 const unsigned char *pwd, size_t pwdlen,
62 const unsigned char *data, size_t datalen,
63 unsigned char *output )
64 {
65 ((void) pbe_params);
66 ((void) mode);
67 ((void) pwd);
68 ((void) pwdlen);
69 ((void) data);
70 ((void) datalen);
71 ((void) output);
72 return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
73 }
74 #else
75 static int pkcs5_parse_pbkdf2_params( const mbedtls_asn1_buf *params,
76 mbedtls_asn1_buf *salt, int *iterations,
77 int *keylen, mbedtls_md_type_t *md_type )
78 {
79 int ret;
80 mbedtls_asn1_buf prf_alg_oid;
81 unsigned char *p = params->p;
82 const unsigned char *end = params->p + params->len;
83
84 if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
85 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
86 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
87 /*
88 * PBKDF2-params ::= SEQUENCE {
89 * salt OCTET STRING,
90 * iterationCount INTEGER,
91 * keyLength INTEGER OPTIONAL
92 * prf AlgorithmIdentifier DEFAULT algid-hmacWithSHA1
93 * }
94 *
95 */
96 if( ( ret = mbedtls_asn1_get_tag( &p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
97 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
98
99 salt->p = p;
100 p += salt->len;
101
102 if( ( ret = mbedtls_asn1_get_int( &p, end, iterations ) ) != 0 )
103 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
104
105 if( p == end )
106 return( 0 );
107
108 if( ( ret = mbedtls_asn1_get_int( &p, end, keylen ) ) != 0 )
109 {
110 if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
111 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
112 }
113
114 if( p == end )
115 return( 0 );
116
117 if( ( ret = mbedtls_asn1_get_alg_null( &p, end, &prf_alg_oid ) ) != 0 )
118 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
119
120 if( mbedtls_oid_get_md_hmac( &prf_alg_oid, md_type ) != 0 )
121 return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
122
123 if( p != end )
124 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
125 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
126
127 return( 0 );
128 }
129
130 int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
131 const unsigned char *pwd, size_t pwdlen,
132 const unsigned char *data, size_t datalen,
133 unsigned char *output )
134 {
135 int ret, iterations = 0, keylen = 0;
136 unsigned char *p, *end;
137 mbedtls_asn1_buf kdf_alg_oid, enc_scheme_oid, kdf_alg_params, enc_scheme_params;
138 mbedtls_asn1_buf salt;
139 mbedtls_md_type_t md_type = MBEDTLS_MD_SHA1;
140 unsigned char key[32], iv[32];
141 size_t olen = 0;
142 const mbedtls_md_info_t *md_info;
143 const mbedtls_cipher_info_t *cipher_info;
144 mbedtls_md_context_t md_ctx;
145 mbedtls_cipher_type_t cipher_alg;
146 mbedtls_cipher_context_t cipher_ctx;
147
148 p = pbe_params->p;
149 end = p + pbe_params->len;
150
151 /*
152 * PBES2-params ::= SEQUENCE {
153 * keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
154 * encryptionScheme AlgorithmIdentifier {{PBES2-Encs}}
155 * }
156 */
157 if( pbe_params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
158 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
159 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
160
161 if( ( ret = mbedtls_asn1_get_alg( &p, end, &kdf_alg_oid, &kdf_alg_params ) ) != 0 )
162 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
163
164 // Only PBKDF2 supported at the moment
165 //
166 if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBKDF2, &kdf_alg_oid ) != 0 )
167 return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
168
169 if( ( ret = pkcs5_parse_pbkdf2_params( &kdf_alg_params,
170 &salt, &iterations, &keylen,
171 &md_type ) ) != 0 )
172 {
173 return( ret );
174 }
175
176 md_info = mbedtls_md_info_from_type( md_type );
177 if( md_info == NULL )
178 return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
179
180 if( ( ret = mbedtls_asn1_get_alg( &p, end, &enc_scheme_oid,
181 &enc_scheme_params ) ) != 0 )
182 {
183 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
184 }
185
186 if( mbedtls_oid_get_cipher_alg( &enc_scheme_oid, &cipher_alg ) != 0 )
187 return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
188
189 cipher_info = mbedtls_cipher_info_from_type( cipher_alg );
190 if( cipher_info == NULL )
191 return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
192
193 /*
194 * The value of keylen from pkcs5_parse_pbkdf2_params() is ignored
195 * since it is optional and we don't know if it was set or not
196 */
197 keylen = cipher_info->key_bitlen / 8;
198
199 if( enc_scheme_params.tag != MBEDTLS_ASN1_OCTET_STRING ||
200 enc_scheme_params.len != cipher_info->iv_size )
201 {
202 return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT );
203 }
204
205 mbedtls_md_init( &md_ctx );
206 mbedtls_cipher_init( &cipher_ctx );
207
208 memcpy( iv, enc_scheme_params.p, enc_scheme_params.len );
209
210 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
211 goto exit;
212
213 if( ( ret = mbedtls_pkcs5_pbkdf2_hmac( &md_ctx, pwd, pwdlen, salt.p, salt.len,
214 iterations, keylen, key ) ) != 0 )
215 {
216 goto exit;
217 }
218
219 if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
220 goto exit;
221
222 if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
223 goto exit;
224
225 if( ( ret = mbedtls_cipher_crypt( &cipher_ctx, iv, enc_scheme_params.len,
226 data, datalen, output, &olen ) ) != 0 )
227 ret = MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH;
228
229 exit:
230 mbedtls_md_free( &md_ctx );
231 mbedtls_cipher_free( &cipher_ctx );
232
233 return( ret );
234 }
235 #endif /* MBEDTLS_ASN1_PARSE_C */
236
237 int mbedtls_pkcs5_pbkdf2_hmac( mbedtls_md_context_t *ctx, const unsigned char *password,
238 size_t plen, const unsigned char *salt, size_t slen,
239 unsigned int iteration_count,
240 uint32_t key_length, unsigned char *output )
241 {
242 int ret, j;
243 unsigned int i;
244 unsigned char md1[MBEDTLS_MD_MAX_SIZE];
245 unsigned char work[MBEDTLS_MD_MAX_SIZE];
246 unsigned char md_size = mbedtls_md_get_size( ctx->md_info );
247 size_t use_len;
248 unsigned char *out_p = output;
249 unsigned char counter[4];
250
251 memset( counter, 0, 4 );
252 counter[3] = 1;
253
254 #if UINT_MAX > 0xFFFFFFFF
255 if( iteration_count > 0xFFFFFFFF )
256 return( MBEDTLS_ERR_PKCS5_BAD_INPUT_DATA );
257 #endif
258
259 while( key_length )
260 {
261 // U1 ends up in work
262 //
263 if( ( ret = mbedtls_md_hmac_starts( ctx, password, plen ) ) != 0 )
264 return( ret );
265
266 if( ( ret = mbedtls_md_hmac_update( ctx, salt, slen ) ) != 0 )
267 return( ret );
268
269 if( ( ret = mbedtls_md_hmac_update( ctx, counter, 4 ) ) != 0 )
270 return( ret );
271
272 if( ( ret = mbedtls_md_hmac_finish( ctx, work ) ) != 0 )
273 return( ret );
274
275 memcpy( md1, work, md_size );
276
277 for( i = 1; i < iteration_count; i++ )
278 {
279 // U2 ends up in md1
280 //
281 if( ( ret = mbedtls_md_hmac_starts( ctx, password, plen ) ) != 0 )
282 return( ret );
283
284 if( ( ret = mbedtls_md_hmac_update( ctx, md1, md_size ) ) != 0 )
285 return( ret );
286
287 if( ( ret = mbedtls_md_hmac_finish( ctx, md1 ) ) != 0 )
288 return( ret );
289
290 // U1 xor U2
291 //
292 for( j = 0; j < md_size; j++ )
293 work[j] ^= md1[j];
294 }
295
296 use_len = ( key_length < md_size ) ? key_length : md_size;
297 memcpy( out_p, work, use_len );
298
299 key_length -= (uint32_t) use_len;
300 out_p += use_len;
301
302 for( i = 4; i > 0; i-- )
303 if( ++counter[i - 1] != 0 )
304 break;
305 }
306
307 return( 0 );
308 }
309
310 #if defined(MBEDTLS_SELF_TEST)
311
312 #if !defined(MBEDTLS_SHA1_C)
313 int mbedtls_pkcs5_self_test( int verbose )
314 {
315 if( verbose != 0 )
316 mbedtls_printf( " PBKDF2 (SHA1): skipped\n\n" );
317
318 return( 0 );
319 }
320 #else
321
322 #define MAX_TESTS 6
323
324 static const size_t plen[MAX_TESTS] =
325 { 8, 8, 8, 24, 9 };
326
327 static const unsigned char password[MAX_TESTS][32] =
328 {
329 "password",
330 "password",
331 "password",
332 "passwordPASSWORDpassword",
333 "pass\0word",
334 };
335
336 static const size_t slen[MAX_TESTS] =
337 { 4, 4, 4, 36, 5 };
338
339 static const unsigned char salt[MAX_TESTS][40] =
340 {
341 "salt",
342 "salt",
343 "salt",
344 "saltSALTsaltSALTsaltSALTsaltSALTsalt",
345 "sa\0lt",
346 };
347
348 static const uint32_t it_cnt[MAX_TESTS] =
349 { 1, 2, 4096, 4096, 4096 };
350
351 static const uint32_t key_len[MAX_TESTS] =
352 { 20, 20, 20, 25, 16 };
353
354 static const unsigned char result_key[MAX_TESTS][32] =
355 {
356 { 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71,
357 0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06,
358 0x2f, 0xe0, 0x37, 0xa6 },
359 { 0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c,
360 0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0,
361 0xd8, 0xde, 0x89, 0x57 },
362 { 0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a,
363 0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0,
364 0x65, 0xa4, 0x29, 0xc1 },
365 { 0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b,
366 0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a,
367 0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70,
368 0x38 },
369 { 0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d,
370 0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3 },
371 };
372
373 int mbedtls_pkcs5_self_test( int verbose )
374 {
375 mbedtls_md_context_t sha1_ctx;
376 const mbedtls_md_info_t *info_sha1;
377 int ret, i;
378 unsigned char key[64];
379
380 mbedtls_md_init( &sha1_ctx );
381
382 info_sha1 = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
383 if( info_sha1 == NULL )
384 {
385 ret = 1;
386 goto exit;
387 }
388
389 if( ( ret = mbedtls_md_setup( &sha1_ctx, info_sha1, 1 ) ) != 0 )
390 {
391 ret = 1;
392 goto exit;
393 }
394
395 for( i = 0; i < MAX_TESTS; i++ )
396 {
397 if( verbose != 0 )
398 mbedtls_printf( " PBKDF2 (SHA1) #%d: ", i );
399
400 ret = mbedtls_pkcs5_pbkdf2_hmac( &sha1_ctx, password[i], plen[i], salt[i],
401 slen[i], it_cnt[i], key_len[i], key );
402 if( ret != 0 ||
403 memcmp( result_key[i], key, key_len[i] ) != 0 )
404 {
405 if( verbose != 0 )
406 mbedtls_printf( "failed\n" );
407
408 ret = 1;
409 goto exit;
410 }
411
412 if( verbose != 0 )
413 mbedtls_printf( "passed\n" );
414 }
415
416 if( verbose != 0 )
417 mbedtls_printf( "\n" );
418
419 exit:
420 mbedtls_md_free( &sha1_ctx );
421
422 return( ret );
423 }
424 #endif /* MBEDTLS_SHA1_C */
425
426 #endif /* MBEDTLS_SELF_TEST */
427
428 #endif /* MBEDTLS_PKCS5_C */
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