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1 /*

2 * PKCS#12 Personal Information Exchange Syntax

3 *

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 */

30 #if !defined(MBEDTLS_CONFIG_FILE)

31 #include "mbedtls/config.h"

32 #else

33 #include MBEDTLS_CONFIG_FILE

34 #endif

36 #if defined(MBEDTLS_PKCS12_C)

38 #include "mbedtls/pkcs12.h"

39 #include "mbedtls/asn1.h"

40 #include "mbedtls/cipher.h"

41 #include "mbedtls/platform_util.h"

43 #include <string.h>

45 #if defined(MBEDTLS_ARC4_C)

46 #include "mbedtls/arc4.h"

47 #endif

49 #if defined(MBEDTLS_DES_C)

50 #include "mbedtls/des.h"

51 #endif

 static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params,

                                     mbedtls_asn1_buf *salt, int *iterations )

55 {

56 int ret;

     unsigned char **p = &params->p;

     const unsigned char *end = params->p + params->len;

60 /*

61 * pkcs-12PbeParams ::= SEQUENCE {

62 * salt OCTET STRING,

63 * iterations INTEGER

64 * }

65 *

66 */

     if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )

68 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +

69 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );

     if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )

72 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );

74 salt->p = *p;

75 *p += salt->len;

     if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )

78 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );

80 if( *p != end )

81 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +

82 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );

84 return( 0 );

85 }

87 #define PKCS12_MAX_PWDLEN 128

 static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,

                                      const unsigned char *pwd,  size_t pwdlen,

                                      unsigned char *key, size_t keylen,

                                      unsigned char *iv,  size_t ivlen )

93 {

     int ret, iterations = 0;

95 mbedtls_asn1_buf salt;

96 size_t i;

     unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];

99 if( pwdlen > PKCS12_MAX_PWDLEN )

100 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );

101

     memset( &salt, 0, sizeof(mbedtls_asn1_buf) );

     memset( &unipwd, 0, sizeof(unipwd) );

104

     if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt,

106 &iterations ) ) != 0 )

107 return( ret );

108

     for( i = 0; i < pwdlen; i++ )

         unipwd[i * 2 + 1] = pwd[i];

111

     if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,

                                    salt.p, salt.len, md_type,

114 MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 )

115 {

116 return( ret );

117 }

118

     if( iv == NULL || ivlen == 0 )

120 return( 0 );

121

     if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,

                                    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

 int mbedtls_pkcs12_pbe_sha1_rc4_128( mbedtls_asn1_buf *pbe_params, int mode,

                              const unsigned char *pwd,  size_t pwdlen,

                              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

     if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,

156 pwd, pwdlen,

                                           key, 16, NULL, 0 ) ) != 0 )

158 {

159 return( ret );

160 }

161

     mbedtls_arc4_setup( &ctx, key, 16 );

     if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )

164 goto exit;

165

166 exit:

     mbedtls_platform_zeroize( key, sizeof( key ) );

168 mbedtls_arc4_free( &ctx );

169

170 return( ret );

171 #endif /* MBEDTLS_ARC4_C */

172 }

173

 int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,

175 mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,

                 const unsigned char *pwd,  size_t pwdlen,

                 const unsigned char *data, size_t len,

178 unsigned char *output )

179 {

     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

     keylen = cipher_info->key_bitlen / 8;

192

     if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,

194 key, keylen,

                                           iv, cipher_info->iv_size ) ) != 0 )

196 {

197 return( ret );

198 }

199

200 mbedtls_cipher_init( &cipher_ctx );

201

     if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )

203 goto exit;

204

     if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )

206 goto exit;

207

     if( ( ret = mbedtls_cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )

209 goto exit;

210

     if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 )

212 goto exit;

213

     if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,

215 output, &olen ) ) != 0 )

216 {

217 goto exit;

218 }

219

     if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )

221 ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;

222

223 exit:

     mbedtls_platform_zeroize( key, sizeof( key ) );

     mbedtls_platform_zeroize( iv,  sizeof( iv  ) );

226 mbedtls_cipher_free( &cipher_ctx );

227

228 return( ret );

229 }

230

 static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,

                                 const unsigned char *filler, size_t fill_len )

233 {

234 unsigned char *p = data;

235 size_t use_len;

236

     while( data_len > 0 )

238 {

         use_len = ( data_len > fill_len ) ? fill_len : data_len;

         memcpy( p, filler, use_len );

241 p += use_len;

242 data_len -= use_len;

243 }

244 }

245

 int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,

                        const unsigned char *pwd, size_t pwdlen,

                        const unsigned char *salt, size_t saltlen,

                        mbedtls_md_type_t md_type, int id, int iterations )

250 {

251 int ret;

252 unsigned int j;

253

254 unsigned char diversifier[128];

     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

     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

     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

     if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )

276 return( ret );

277 hlen = mbedtls_md_get_size( md_info );

278

     if( hlen <= 32 )

280 v = 64;

281 else

282 v = 128;

283

     memset( diversifier, (unsigned char) id, v );

285

     pkcs12_fill_buffer( salt_block, v, salt, saltlen );

     pkcs12_fill_buffer( pwd_block,  v, pwd,  pwdlen  );

288

289 p = data;

     while( datalen > 0 )

291 {

292 // Calculate hash( diversifier || salt_block || pwd_block )

         if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 )

294 goto exit;

295

         if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )

297 goto exit;

298

         if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )

300 goto exit;

301

         if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )

303 goto exit;

304

         if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )

306 goto exit;

307

308 // Perform remaining ( iterations - 1 ) recursive hash calculations

         for( i = 1; i < (size_t) iterations; i++ )

310 {

             if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 )

312 goto exit;

313 }

314

         use_len = ( datalen > hlen ) ? hlen : datalen;

         memcpy( p, hash_output, use_len );

317 datalen -= use_len;

318 p += use_len;

319

         if( datalen == 0 )

321 break;

322

323 // Concatenating copies of hash_output into hash_block (B)

         pkcs12_fill_buffer( hash_block, v, hash_output, hlen );

325

326 // B += 1

         for( i = v; i > 0; i-- )

             if( ++hash_block[i - 1] != 0 )

329 break;

330

331 // salt_block += B

332 c = 0;

         for( i = v; i > 0; i-- )

334 {

             j = salt_block[i - 1] + hash_block[i - 1] + c;

             c = (unsigned char) (j >> 8);

             salt_block[i - 1] = j & 0xFF;

338 }

339

340 // pwd_block += B

341 c = 0;

         for( i = v; i > 0; i-- )

343 {

             j = pwd_block[i - 1] + hash_block[i - 1] + c;

             c = (unsigned char) (j >> 8);

             pwd_block[i - 1] = j & 0xFF;

347 }

348 }

349

350 ret = 0;

351

352 exit:

     mbedtls_platform_zeroize( salt_block, sizeof( salt_block ) );

     mbedtls_platform_zeroize( pwd_block, sizeof( pwd_block ) );

     mbedtls_platform_zeroize( hash_block, sizeof( hash_block ) );

     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 */