GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/rsa/rsa_pmeth.c Lines: 143 298 48.0 %
Date: 2017-11-13 Branches: 56 205 27.3 %

Line Branch Exec Source
1
/* $OpenBSD: rsa_pmeth.c,v 1.20 2017/08/28 17:41:59 jsing Exp $ */
2
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3
 * project 2006.
4
 */
5
/* ====================================================================
6
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions
10
 * are met:
11
 *
12
 * 1. Redistributions of source code must retain the above copyright
13
 *    notice, this list of conditions and the following disclaimer.
14
 *
15
 * 2. Redistributions in binary form must reproduce the above copyright
16
 *    notice, this list of conditions and the following disclaimer in
17
 *    the documentation and/or other materials provided with the
18
 *    distribution.
19
 *
20
 * 3. All advertising materials mentioning features or use of this
21
 *    software must display the following acknowledgment:
22
 *    "This product includes software developed by the OpenSSL Project
23
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24
 *
25
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26
 *    endorse or promote products derived from this software without
27
 *    prior written permission. For written permission, please contact
28
 *    licensing@OpenSSL.org.
29
 *
30
 * 5. Products derived from this software may not be called "OpenSSL"
31
 *    nor may "OpenSSL" appear in their names without prior written
32
 *    permission of the OpenSSL Project.
33
 *
34
 * 6. Redistributions of any form whatsoever must retain the following
35
 *    acknowledgment:
36
 *    "This product includes software developed by the OpenSSL Project
37
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38
 *
39
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50
 * OF THE POSSIBILITY OF SUCH DAMAGE.
51
 * ====================================================================
52
 *
53
 * This product includes cryptographic software written by Eric Young
54
 * (eay@cryptsoft.com).  This product includes software written by Tim
55
 * Hudson (tjh@cryptsoft.com).
56
 *
57
 */
58
59
#include <limits.h>
60
#include <stdio.h>
61
#include <string.h>
62
63
#include <openssl/opensslconf.h>
64
65
#include <openssl/asn1t.h>
66
#include <openssl/bn.h>
67
#include <openssl/err.h>
68
#include <openssl/evp.h>
69
#include <openssl/rsa.h>
70
#include <openssl/x509.h>
71
72
73
#include "evp_locl.h"
74
#include "rsa_locl.h"
75
76
/* RSA pkey context structure */
77
78
typedef struct {
79
	/* Key gen parameters */
80
	int nbits;
81
	BIGNUM *pub_exp;
82
	/* Keygen callback info */
83
	int gentmp[2];
84
	/* RSA padding mode */
85
	int pad_mode;
86
	/* message digest */
87
	const EVP_MD *md;
88
	/* message digest for MGF1 */
89
	const EVP_MD *mgf1md;
90
	/* PSS/OAEP salt length */
91
	int saltlen;
92
	/* Temp buffer */
93
	unsigned char *tbuf;
94
} RSA_PKEY_CTX;
95
96
static int
97
pkey_rsa_init(EVP_PKEY_CTX *ctx)
98
{
99
	RSA_PKEY_CTX *rctx;
100
101
8312
	rctx = malloc(sizeof(RSA_PKEY_CTX));
102
4156
	if (!rctx)
103
		return 0;
104
4156
	rctx->nbits = 2048;
105
4156
	rctx->pub_exp = NULL;
106
4156
	rctx->pad_mode = RSA_PKCS1_PADDING;
107
4156
	rctx->md = NULL;
108
4156
	rctx->mgf1md = NULL;
109
4156
	rctx->tbuf = NULL;
110
111
4156
	rctx->saltlen = -2;
112
113
4156
	ctx->data = rctx;
114
4156
	ctx->keygen_info = rctx->gentmp;
115
4156
	ctx->keygen_info_count = 2;
116
117
4156
	return 1;
118
4156
}
119
120
static int
121
pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
122
{
123
	RSA_PKEY_CTX *dctx, *sctx;
124
125
2796
	if (!pkey_rsa_init(dst))
126
		return 0;
127
1398
	sctx = src->data;
128
1398
	dctx = dst->data;
129
1398
	dctx->nbits = sctx->nbits;
130
1398
	if (sctx->pub_exp) {
131
		dctx->pub_exp = BN_dup(sctx->pub_exp);
132
		if (!dctx->pub_exp)
133
			return 0;
134
	}
135
1398
	dctx->pad_mode = sctx->pad_mode;
136
1398
	dctx->md = sctx->md;
137
1398
	return 1;
138
1398
}
139
140
static int
141
setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
142
{
143
4
	if (ctx->tbuf)
144
		return 1;
145
2
	ctx->tbuf = malloc(EVP_PKEY_size(pk->pkey));
146
2
	if (!ctx->tbuf)
147
		return 0;
148
2
	return 1;
149
2
}
150
151
static void
152
pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
153
{
154
8312
	RSA_PKEY_CTX *rctx = ctx->data;
155
156
4156
	if (rctx) {
157
4156
		BN_free(rctx->pub_exp);
158
4156
		free(rctx->tbuf);
159
4156
		free(rctx);
160
4156
	}
161
4156
}
162
163
static int
164
pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
165
    const unsigned char *tbs, size_t tbslen)
166
{
167
	int ret;
168
294
	RSA_PKEY_CTX *rctx = ctx->data;
169
147
	RSA *rsa = ctx->pkey->pkey.rsa;
170
171
147
	if (rctx->md) {
172
145
		if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
173
			RSAerror(RSA_R_INVALID_DIGEST_LENGTH);
174
			return -1;
175
		}
176
177
145
		if (rctx->pad_mode == RSA_X931_PADDING) {
178
			if (!setup_tbuf(rctx, ctx))
179
				return -1;
180
			memcpy(rctx->tbuf, tbs, tbslen);
181
			rctx->tbuf[tbslen] =
182
			    RSA_X931_hash_id(EVP_MD_type(rctx->md));
183
			ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf, sig,
184
			    rsa, RSA_X931_PADDING);
185
145
		} else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
186
145
			unsigned int sltmp;
187
188
145
			ret = RSA_sign(EVP_MD_type(rctx->md), tbs, tbslen, sig,
189
			    &sltmp, rsa);
190
145
			if (ret <= 0)
191
				return ret;
192
145
			ret = sltmp;
193

290
		} else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
194
			if (!setup_tbuf(rctx, ctx))
195
				return -1;
196
			if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa, rctx->tbuf,
197
			    tbs, rctx->md, rctx->mgf1md, rctx->saltlen))
198
				return -1;
199
			ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
200
			    sig, rsa, RSA_NO_PADDING);
201
		} else
202
			return -1;
203
	} else
204
4
		ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
205
2
		    rctx->pad_mode);
206
147
	if (ret < 0)
207
		return ret;
208
147
	*siglen = ret;
209
147
	return 1;
210
147
}
211
212
static int
213
pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx, unsigned char *rout, size_t *routlen,
214
    const unsigned char *sig, size_t siglen)
215
{
216
	int ret;
217
4
	RSA_PKEY_CTX *rctx = ctx->data;
218
219
2
	if (rctx->md) {
220
		if (rctx->pad_mode == RSA_X931_PADDING) {
221
			if (!setup_tbuf(rctx, ctx))
222
				return -1;
223
			ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
224
			    ctx->pkey->pkey.rsa, RSA_X931_PADDING);
225
			if (ret < 1)
226
				return 0;
227
			ret--;
228
			if (rctx->tbuf[ret] !=
229
				RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
230
				RSAerror(RSA_R_ALGORITHM_MISMATCH);
231
				return 0;
232
			}
233
			if (ret != EVP_MD_size(rctx->md)) {
234
				RSAerror(RSA_R_INVALID_DIGEST_LENGTH);
235
				return 0;
236
			}
237
			if (rout)
238
				memcpy(rout, rctx->tbuf, ret);
239
		} else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
240
			size_t sltmp;
241
242
			ret = int_rsa_verify(EVP_MD_type(rctx->md), NULL, 0,
243
			    rout, &sltmp, sig, siglen, ctx->pkey->pkey.rsa);
244
			if (ret <= 0)
245
				return 0;
246
			ret = sltmp;
247
		} else
248
			return -1;
249
	} else
250
4
		ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
251
2
		    rctx->pad_mode);
252
2
	if (ret < 0)
253
		return ret;
254
2
	*routlen = ret;
255
2
	return 1;
256
2
}
257
258
static int
259
pkey_rsa_verify(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
260
    const unsigned char *tbs, size_t tbslen)
261
{
262
5136
	RSA_PKEY_CTX *rctx = ctx->data;
263
2568
	RSA *rsa = ctx->pkey->pkey.rsa;
264
2568
	size_t rslen;
265
266
2568
	if (rctx->md) {
267
2566
		if (rctx->pad_mode == RSA_PKCS1_PADDING)
268
5132
			return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
269
2566
			    sig, siglen, rsa);
270
		if (rctx->pad_mode == RSA_X931_PADDING) {
271
			if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig,
272
			    siglen) <= 0)
273
				return 0;
274
		} else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
275
			int ret;
276
277
			if (!setup_tbuf(rctx, ctx))
278
				return -1;
279
			ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
280
			    rsa, RSA_NO_PADDING);
281
			if (ret <= 0)
282
				return 0;
283
			ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs, rctx->md,
284
			    rctx->mgf1md, rctx->tbuf, rctx->saltlen);
285
			if (ret <= 0)
286
				return 0;
287
			return 1;
288
		} else
289
			return -1;
290
	} else {
291
2
		if (!setup_tbuf(rctx, ctx))
292
			return -1;
293
4
		rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf, rsa,
294
2
		    rctx->pad_mode);
295
2
		if (rslen == 0)
296
			return 0;
297
	}
298
299

4
	if (rslen != tbslen || memcmp(tbs, rctx->tbuf, rslen))
300
		return 0;
301
302
2
	return 1;
303
2568
}
304
305
static int
306
pkey_rsa_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
307
    const unsigned char *in, size_t inlen)
308
{
309
	int ret;
310
6
	RSA_PKEY_CTX *rctx = ctx->data;
311
312
6
	ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
313
3
	    rctx->pad_mode);
314
3
	if (ret < 0)
315
		return ret;
316
3
	*outlen = ret;
317
3
	return 1;
318
3
}
319
320
static int
321
pkey_rsa_decrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
322
    const unsigned char *in, size_t inlen)
323
{
324
	int ret;
325
6
	RSA_PKEY_CTX *rctx = ctx->data;
326
327
6
	ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
328
3
	    rctx->pad_mode);
329
3
	if (ret < 0)
330
		return ret;
331
3
	*outlen = ret;
332
3
	return 1;
333
3
}
334
335
static int
336
check_padding_md(const EVP_MD *md, int padding)
337
{
338
5464
	if (!md)
339
		return 1;
340
341
2732
	if (padding == RSA_NO_PADDING) {
342
		RSAerror(RSA_R_INVALID_PADDING_MODE);
343
		return 0;
344
	}
345
346
2732
	if (padding == RSA_X931_PADDING) {
347
		if (RSA_X931_hash_id(EVP_MD_type(md)) == -1) {
348
			RSAerror(RSA_R_INVALID_X931_DIGEST);
349
			return 0;
350
		}
351
		return 1;
352
	}
353
354
2732
	return 1;
355
2732
}
356
357
static int
358
pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
359
{
360
8416
	RSA_PKEY_CTX *rctx = ctx->data;
361
362



4208
	switch (type) {
363
	case EVP_PKEY_CTRL_RSA_PADDING:
364
		if (p1 >= RSA_PKCS1_PADDING && p1 <= RSA_PKCS1_PSS_PADDING) {
365
			if (!check_padding_md(rctx->md, p1))
366
				return 0;
367
			if (p1 == RSA_PKCS1_PSS_PADDING) {
368
				if (!(ctx->operation &
369
				    (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
370
					goto bad_pad;
371
				if (!rctx->md)
372
					rctx->md = EVP_sha1();
373
			}
374
			if (p1 == RSA_PKCS1_OAEP_PADDING) {
375
				if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
376
					goto bad_pad;
377
				if (!rctx->md)
378
					rctx->md = EVP_sha1();
379
			}
380
			rctx->pad_mode = p1;
381
			return 1;
382
		}
383
bad_pad:
384
		RSAerror(RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
385
		return -2;
386
387
	case EVP_PKEY_CTRL_GET_RSA_PADDING:
388
36
		*(int *)p2 = rctx->pad_mode;
389
36
		return 1;
390
391
	case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
392
	case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
393
		if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
394
			RSAerror(RSA_R_INVALID_PSS_SALTLEN);
395
			return -2;
396
		}
397
		if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
398
			*(int *)p2 = rctx->saltlen;
399
		else {
400
			if (p1 < -2)
401
				return -2;
402
			rctx->saltlen = p1;
403
		}
404
		return 1;
405
406
	case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
407
14
		if (p1 < 256) {
408
			RSAerror(RSA_R_INVALID_KEYBITS);
409
			return -2;
410
		}
411
14
		rctx->nbits = p1;
412
14
		return 1;
413
414
	case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
415
2
		if (!p2)
416
			return -2;
417
2
		rctx->pub_exp = p2;
418
2
		return 1;
419
420
	case EVP_PKEY_CTRL_MD:
421
2732
		if (!check_padding_md(p2, rctx->pad_mode))
422
			return 0;
423
2732
		rctx->md = p2;
424
2732
		return 1;
425
426
	case EVP_PKEY_CTRL_RSA_MGF1_MD:
427
	case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
428
		if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
429
			RSAerror(RSA_R_INVALID_MGF1_MD);
430
			return -2;
431
		}
432
		if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
433
			if (rctx->mgf1md)
434
				*(const EVP_MD **)p2 = rctx->mgf1md;
435
			else
436
				*(const EVP_MD **)p2 = rctx->md;
437
		} else
438
			rctx->mgf1md = p2;
439
		return 1;
440
441
	case EVP_PKEY_CTRL_DIGESTINIT:
442
	case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
443
	case EVP_PKEY_CTRL_PKCS7_DECRYPT:
444
	case EVP_PKEY_CTRL_PKCS7_SIGN:
445
1424
		return 1;
446
	case EVP_PKEY_CTRL_PEER_KEY:
447
		RSAerror(RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
448
		return -2;
449
450
	default:
451
		return -2;
452
	}
453
4208
}
454
455
static int
456
pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
457
{
458
	long lval;
459
8
	char *ep;
460
461
4
	if (!value) {
462
		RSAerror(RSA_R_VALUE_MISSING);
463
		return 0;
464
	}
465
4
	if (!strcmp(type, "rsa_padding_mode")) {
466
		int pm;
467
		if (!strcmp(value, "pkcs1"))
468
			pm = RSA_PKCS1_PADDING;
469
		else if (!strcmp(value, "none"))
470
			pm = RSA_NO_PADDING;
471
		else if (!strcmp(value, "oeap"))
472
			pm = RSA_PKCS1_OAEP_PADDING;
473
		else if (!strcmp(value, "oaep"))
474
			pm = RSA_PKCS1_OAEP_PADDING;
475
		else if (!strcmp(value, "x931"))
476
			pm = RSA_X931_PADDING;
477
		else if (!strcmp(value, "pss"))
478
			pm = RSA_PKCS1_PSS_PADDING;
479
		else {
480
			RSAerror(RSA_R_UNKNOWN_PADDING_TYPE);
481
			return -2;
482
		}
483
		return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
484
	}
485
486
4
	if (!strcmp(type, "rsa_pss_saltlen")) {
487
		int saltlen;
488
489
		errno = 0;
490
		lval = strtol(value, &ep, 10);
491
		if (value[0] == '\0' || *ep != '\0')
492
			goto not_a_number;
493
		if ((errno == ERANGE &&
494
		    (lval == LONG_MAX || lval == LONG_MIN)) ||
495
		    (lval > INT_MAX || lval < INT_MIN))
496
			goto out_of_range;
497
		saltlen = lval;
498
		return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
499
	}
500
501
4
	if (!strcmp(type, "rsa_keygen_bits")) {
502
		int nbits;
503
504
2
		errno = 0;
505
2
		lval = strtol(value, &ep, 10);
506

4
		if (value[0] == '\0' || *ep != '\0')
507
			goto not_a_number;
508
2
		if ((errno == ERANGE &&
509
		    (lval == LONG_MAX || lval == LONG_MIN)) ||
510
2
		    (lval > INT_MAX || lval < INT_MIN))
511
			goto out_of_range;
512
2
		nbits = lval;
513
2
		return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
514
	}
515
516
2
	if (!strcmp(type, "rsa_keygen_pubexp")) {
517
		int ret;
518
2
		BIGNUM *pubexp = NULL;
519
520
2
		if (!BN_asc2bn(&pubexp, value))
521
			return 0;
522
2
		ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
523
2
		if (ret <= 0)
524
			BN_free(pubexp);
525
2
		return ret;
526
2
	}
527
528
not_a_number:
529
out_of_range:
530
	return -2;
531
4
}
532
533
static int
534
pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
535
{
536
	RSA *rsa = NULL;
537
28
	RSA_PKEY_CTX *rctx = ctx->data;
538
14
	BN_GENCB *pcb, cb;
539
	int ret;
540
541
14
	if (!rctx->pub_exp) {
542
12
		rctx->pub_exp = BN_new();
543

24
		if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
544
			return 0;
545
	}
546
14
	rsa = RSA_new();
547
14
	if (!rsa)
548
		return 0;
549
14
	if (ctx->pkey_gencb) {
550
		pcb = &cb;
551
14
		evp_pkey_set_cb_translate(pcb, ctx);
552
14
	} else
553
		pcb = NULL;
554
14
	ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
555
14
	if (ret > 0)
556
14
		EVP_PKEY_assign_RSA(pkey, rsa);
557
	else
558
		RSA_free(rsa);
559
14
	return ret;
560
14
}
561
562
const EVP_PKEY_METHOD rsa_pkey_meth = {
563
	.pkey_id = EVP_PKEY_RSA,
564
	.flags = EVP_PKEY_FLAG_AUTOARGLEN,
565
566
	.init = pkey_rsa_init,
567
	.copy = pkey_rsa_copy,
568
	.cleanup = pkey_rsa_cleanup,
569
570
	.keygen = pkey_rsa_keygen,
571
572
	.sign = pkey_rsa_sign,
573
574
	.verify = pkey_rsa_verify,
575
576
	.verify_recover = pkey_rsa_verifyrecover,
577
578
	.encrypt = pkey_rsa_encrypt,
579
580
	.decrypt = pkey_rsa_decrypt,
581
582
	.ctrl = pkey_rsa_ctrl,
583
	.ctrl_str = pkey_rsa_ctrl_str
584
};