1/*
2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <openssl/x509.h>
12#include <openssl/asn1.h>
13#include <openssl/bn.h>
14#include <openssl/cms.h>
15#include <openssl/core_names.h>
16#include "internal/cryptlib.h"
17#include "crypto/asn1.h"
18#include "crypto/evp.h"
19#include "internal/param_build.h"
20#include "dsa_local.h"
21
22static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
23{
24 const unsigned char *p, *pm;
25 int pklen, pmlen;
26 int ptype;
27 const void *pval;
28 const ASN1_STRING *pstr;
29 X509_ALGOR *palg;
30 ASN1_INTEGER *public_key = NULL;
31
32 DSA *dsa = NULL;
33
34 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
35 return 0;
36 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
37
38 if (ptype == V_ASN1_SEQUENCE) {
39 pstr = pval;
40 pm = pstr->data;
41 pmlen = pstr->length;
42
43 if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL) {
44 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
45 goto err;
46 }
47
48 } else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF)) {
49 if ((dsa = DSA_new()) == NULL) {
50 DSAerr(DSA_F_DSA_PUB_DECODE, ERR_R_MALLOC_FAILURE);
51 goto err;
52 }
53 } else {
54 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
55 goto err;
56 }
57
58 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
59 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
60 goto err;
61 }
62
63 if ((dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
64 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
65 goto err;
66 }
67
68 dsa->dirty_cnt++;
69 ASN1_INTEGER_free(public_key);
70 EVP_PKEY_assign_DSA(pkey, dsa);
71 return 1;
72
73 err:
74 ASN1_INTEGER_free(public_key);
75 DSA_free(dsa);
76 return 0;
77
78}
79
80static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
81{
82 DSA *dsa;
83 int ptype;
84 unsigned char *penc = NULL;
85 int penclen;
86 ASN1_STRING *str = NULL;
87 ASN1_INTEGER *pubint = NULL;
88 ASN1_OBJECT *aobj;
89
90 dsa = pkey->pkey.dsa;
91 if (pkey->save_parameters && dsa->p && dsa->q && dsa->g) {
92 str = ASN1_STRING_new();
93 if (str == NULL) {
94 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
95 goto err;
96 }
97 str->length = i2d_DSAparams(dsa, &str->data);
98 if (str->length <= 0) {
99 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
100 goto err;
101 }
102 ptype = V_ASN1_SEQUENCE;
103 } else
104 ptype = V_ASN1_UNDEF;
105
106 pubint = BN_to_ASN1_INTEGER(dsa->pub_key, NULL);
107
108 if (pubint == NULL) {
109 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
110 goto err;
111 }
112
113 penclen = i2d_ASN1_INTEGER(pubint, &penc);
114 ASN1_INTEGER_free(pubint);
115
116 if (penclen <= 0) {
117 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
118 goto err;
119 }
120
121 aobj = OBJ_nid2obj(EVP_PKEY_DSA);
122 if (aobj == NULL)
123 goto err;
124
125 if (X509_PUBKEY_set0_param(pk, aobj, ptype, str, penc, penclen))
126 return 1;
127
128 err:
129 OPENSSL_free(penc);
130 ASN1_STRING_free(str);
131
132 return 0;
133}
134
135/*
136 * In PKCS#8 DSA: you just get a private key integer and parameters in the
137 * AlgorithmIdentifier the pubkey must be recalculated.
138 */
139
140static int dsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
141{
142 const unsigned char *p, *pm;
143 int pklen, pmlen;
144 int ptype;
145 const void *pval;
146 const ASN1_STRING *pstr;
147 const X509_ALGOR *palg;
148 ASN1_INTEGER *privkey = NULL;
149 BN_CTX *ctx = NULL;
150
151 DSA *dsa = NULL;
152
153 int ret = 0;
154
155 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
156 return 0;
157 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
158
159 if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
160 goto decerr;
161 if (privkey->type == V_ASN1_NEG_INTEGER || ptype != V_ASN1_SEQUENCE)
162 goto decerr;
163
164 pstr = pval;
165 pm = pstr->data;
166 pmlen = pstr->length;
167 if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL)
168 goto decerr;
169 /* We have parameters now set private key */
170 if ((dsa->priv_key = BN_secure_new()) == NULL
171 || !ASN1_INTEGER_to_BN(privkey, dsa->priv_key)) {
172 DSAerr(DSA_F_DSA_PRIV_DECODE, DSA_R_BN_ERROR);
173 goto dsaerr;
174 }
175 /* Calculate public key */
176 if ((dsa->pub_key = BN_new()) == NULL) {
177 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
178 goto dsaerr;
179 }
180 if ((ctx = BN_CTX_new()) == NULL) {
181 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
182 goto dsaerr;
183 }
184
185 BN_set_flags(dsa->priv_key, BN_FLG_CONSTTIME);
186 if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx)) {
187 DSAerr(DSA_F_DSA_PRIV_DECODE, DSA_R_BN_ERROR);
188 goto dsaerr;
189 }
190
191 dsa->dirty_cnt++;
192 EVP_PKEY_assign_DSA(pkey, dsa);
193
194 ret = 1;
195 goto done;
196
197 decerr:
198 DSAerr(DSA_F_DSA_PRIV_DECODE, DSA_R_DECODE_ERROR);
199 dsaerr:
200 DSA_free(dsa);
201 done:
202 BN_CTX_free(ctx);
203 ASN1_STRING_clear_free(privkey);
204 return ret;
205}
206
207static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
208{
209 ASN1_STRING *params = NULL;
210 ASN1_INTEGER *prkey = NULL;
211 unsigned char *dp = NULL;
212 int dplen;
213
214 if (pkey->pkey.dsa == NULL|| pkey->pkey.dsa->priv_key == NULL) {
215 DSAerr(DSA_F_DSA_PRIV_ENCODE, DSA_R_MISSING_PARAMETERS);
216 goto err;
217 }
218
219 params = ASN1_STRING_new();
220
221 if (params == NULL) {
222 DSAerr(DSA_F_DSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
223 goto err;
224 }
225
226 params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
227 if (params->length <= 0) {
228 DSAerr(DSA_F_DSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
229 goto err;
230 }
231 params->type = V_ASN1_SEQUENCE;
232
233 /* Get private key into integer */
234 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
235
236 if (prkey == NULL) {
237 DSAerr(DSA_F_DSA_PRIV_ENCODE, DSA_R_BN_ERROR);
238 goto err;
239 }
240
241 dplen = i2d_ASN1_INTEGER(prkey, &dp);
242
243 ASN1_STRING_clear_free(prkey);
244 prkey = NULL;
245
246 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
247 V_ASN1_SEQUENCE, params, dp, dplen))
248 goto err;
249
250 return 1;
251
252 err:
253 OPENSSL_free(dp);
254 ASN1_STRING_free(params);
255 ASN1_STRING_clear_free(prkey);
256 return 0;
257}
258
259static int int_dsa_size(const EVP_PKEY *pkey)
260{
261 return DSA_size(pkey->pkey.dsa);
262}
263
264static int dsa_bits(const EVP_PKEY *pkey)
265{
266 return DSA_bits(pkey->pkey.dsa);
267}
268
269static int dsa_security_bits(const EVP_PKEY *pkey)
270{
271 return DSA_security_bits(pkey->pkey.dsa);
272}
273
274static int dsa_missing_parameters(const EVP_PKEY *pkey)
275{
276 DSA *dsa;
277 dsa = pkey->pkey.dsa;
278 if (dsa == NULL || dsa->p == NULL || dsa->q == NULL || dsa->g == NULL)
279 return 1;
280 return 0;
281}
282
283static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
284{
285 BIGNUM *a;
286
287 if (to->pkey.dsa == NULL) {
288 to->pkey.dsa = DSA_new();
289 if (to->pkey.dsa == NULL)
290 return 0;
291 }
292
293 if ((a = BN_dup(from->pkey.dsa->p)) == NULL)
294 return 0;
295 BN_free(to->pkey.dsa->p);
296 to->pkey.dsa->p = a;
297
298 if ((a = BN_dup(from->pkey.dsa->q)) == NULL)
299 return 0;
300 BN_free(to->pkey.dsa->q);
301 to->pkey.dsa->q = a;
302
303 if ((a = BN_dup(from->pkey.dsa->g)) == NULL)
304 return 0;
305 BN_free(to->pkey.dsa->g);
306 to->pkey.dsa->g = a;
307 to->pkey.dsa->dirty_cnt++;
308 return 1;
309}
310
311static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
312{
313 if (BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) ||
314 BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) ||
315 BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g))
316 return 0;
317 else
318 return 1;
319}
320
321static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
322{
323 if (BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) != 0)
324 return 0;
325 else
326 return 1;
327}
328
329static void int_dsa_free(EVP_PKEY *pkey)
330{
331 DSA_free(pkey->pkey.dsa);
332}
333
334static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
335{
336 int ret = 0;
337 const char *ktype = NULL;
338 const BIGNUM *priv_key, *pub_key;
339 int mod_len = 0;
340
341 if (x->p != NULL)
342 mod_len = BN_num_bits(x->p);
343
344 if (ptype == 2)
345 priv_key = x->priv_key;
346 else
347 priv_key = NULL;
348
349 if (ptype > 0)
350 pub_key = x->pub_key;
351 else
352 pub_key = NULL;
353
354 if (ptype == 2)
355 ktype = "Private-Key";
356 else if (ptype == 1)
357 ktype = "Public-Key";
358 else
359 ktype = "DSA-Parameters";
360
361 if (priv_key) {
362 if (!BIO_indent(bp, off, 128))
363 goto err;
364 if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p))
365 <= 0)
366 goto err;
367 } else {
368 if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
369 goto err;
370 }
371
372 if (!ASN1_bn_print(bp, "priv:", priv_key, NULL, off))
373 goto err;
374 if (!ASN1_bn_print(bp, "pub: ", pub_key, NULL, off))
375 goto err;
376 if (!ASN1_bn_print(bp, "P: ", x->p, NULL, off))
377 goto err;
378 if (!ASN1_bn_print(bp, "Q: ", x->q, NULL, off))
379 goto err;
380 if (!ASN1_bn_print(bp, "G: ", x->g, NULL, off))
381 goto err;
382 ret = 1;
383 err:
384 return ret;
385}
386
387static int dsa_param_decode(EVP_PKEY *pkey,
388 const unsigned char **pder, int derlen)
389{
390 DSA *dsa;
391
392 if ((dsa = d2i_DSAparams(NULL, pder, derlen)) == NULL) {
393 DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
394 return 0;
395 }
396 dsa->dirty_cnt++;
397 EVP_PKEY_assign_DSA(pkey, dsa);
398 return 1;
399}
400
401static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
402{
403 return i2d_DSAparams(pkey->pkey.dsa, pder);
404}
405
406static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
407 ASN1_PCTX *ctx)
408{
409 return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
410}
411
412static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
413 ASN1_PCTX *ctx)
414{
415 return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
416}
417
418static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
419 ASN1_PCTX *ctx)
420{
421 return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
422}
423
424static int old_dsa_priv_decode(EVP_PKEY *pkey,
425 const unsigned char **pder, int derlen)
426{
427 DSA *dsa;
428
429 if ((dsa = d2i_DSAPrivateKey(NULL, pder, derlen)) == NULL) {
430 DSAerr(DSA_F_OLD_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
431 return 0;
432 }
433 dsa->dirty_cnt++;
434 EVP_PKEY_assign_DSA(pkey, dsa);
435 return 1;
436}
437
438static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
439{
440 return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
441}
442
443static int dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
444 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
445{
446 DSA_SIG *dsa_sig;
447 const unsigned char *p;
448
449 if (!sig) {
450 if (BIO_puts(bp, "\n") <= 0)
451 return 0;
452 else
453 return 1;
454 }
455 p = sig->data;
456 dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length);
457 if (dsa_sig) {
458 int rv = 0;
459 const BIGNUM *r, *s;
460
461 DSA_SIG_get0(dsa_sig, &r, &s);
462
463 if (BIO_write(bp, "\n", 1) != 1)
464 goto err;
465
466 if (!ASN1_bn_print(bp, "r: ", r, NULL, indent))
467 goto err;
468 if (!ASN1_bn_print(bp, "s: ", s, NULL, indent))
469 goto err;
470 rv = 1;
471 err:
472 DSA_SIG_free(dsa_sig);
473 return rv;
474 }
475 if (BIO_puts(bp, "\n") <= 0)
476 return 0;
477 return X509_signature_dump(bp, sig, indent);
478}
479
480static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
481{
482 switch (op) {
483 case ASN1_PKEY_CTRL_PKCS7_SIGN:
484 if (arg1 == 0) {
485 int snid, hnid;
486 X509_ALGOR *alg1, *alg2;
487 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
488 if (alg1 == NULL || alg1->algorithm == NULL)
489 return -1;
490 hnid = OBJ_obj2nid(alg1->algorithm);
491 if (hnid == NID_undef)
492 return -1;
493 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
494 return -1;
495 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
496 }
497 return 1;
498#ifndef OPENSSL_NO_CMS
499 case ASN1_PKEY_CTRL_CMS_SIGN:
500 if (arg1 == 0) {
501 int snid, hnid;
502 X509_ALGOR *alg1, *alg2;
503 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
504 if (alg1 == NULL || alg1->algorithm == NULL)
505 return -1;
506 hnid = OBJ_obj2nid(alg1->algorithm);
507 if (hnid == NID_undef)
508 return -1;
509 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
510 return -1;
511 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
512 }
513 return 1;
514
515 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
516 *(int *)arg2 = CMS_RECIPINFO_NONE;
517 return 1;
518#endif
519
520 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
521 *(int *)arg2 = NID_sha256;
522 return 1;
523
524 default:
525 return -2;
526
527 }
528
529}
530
531static size_t dsa_pkey_dirty_cnt(const EVP_PKEY *pkey)
532{
533 return pkey->pkey.dsa->dirty_cnt;
534}
535
536static void *dsa_pkey_export_to(const EVP_PKEY *pk, EVP_KEYMGMT *keymgmt,
537 int want_domainparams)
538{
539 DSA *dsa = pk->pkey.dsa;
540 OSSL_PARAM_BLD tmpl;
541 const BIGNUM *p = DSA_get0_p(dsa), *g = DSA_get0_g(dsa);
542 const BIGNUM *q = DSA_get0_q(dsa), *pub_key = DSA_get0_pub_key(dsa);
543 const BIGNUM *priv_key = DSA_get0_priv_key(dsa);
544 OSSL_PARAM *params;
545 void *provdata = NULL;
546
547 if (p == NULL || q == NULL || g == NULL)
548 return NULL;
549
550 ossl_param_bld_init(&tmpl);
551 if (!ossl_param_bld_push_BN(&tmpl, OSSL_PKEY_PARAM_FFC_P, p)
552 || !ossl_param_bld_push_BN(&tmpl, OSSL_PKEY_PARAM_FFC_Q, q)
553 || !ossl_param_bld_push_BN(&tmpl, OSSL_PKEY_PARAM_FFC_G, g))
554 return NULL;
555
556 if (!want_domainparams) {
557 /* A key must at least have a public part. */
558 if (!ossl_param_bld_push_BN(&tmpl, OSSL_PKEY_PARAM_DSA_PUB_KEY,
559 pub_key))
560 return NULL;
561
562 if (priv_key != NULL) {
563 if (!ossl_param_bld_push_BN(&tmpl, OSSL_PKEY_PARAM_DSA_PRIV_KEY,
564 priv_key))
565 return NULL;
566 }
567 }
568
569 params = ossl_param_bld_to_param(&tmpl);
570
571 /* We export, the provider imports */
572 provdata = want_domainparams
573 ? evp_keymgmt_importdomparams(keymgmt, params)
574 : evp_keymgmt_importkey(keymgmt, params);
575
576 ossl_param_bld_free(params);
577 return provdata;
578}
579
580/* NB these are sorted in pkey_id order, lowest first */
581
582const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[5] = {
583
584 {
585 EVP_PKEY_DSA2,
586 EVP_PKEY_DSA,
587 ASN1_PKEY_ALIAS},
588
589 {
590 EVP_PKEY_DSA1,
591 EVP_PKEY_DSA,
592 ASN1_PKEY_ALIAS},
593
594 {
595 EVP_PKEY_DSA4,
596 EVP_PKEY_DSA,
597 ASN1_PKEY_ALIAS},
598
599 {
600 EVP_PKEY_DSA3,
601 EVP_PKEY_DSA,
602 ASN1_PKEY_ALIAS},
603
604 {
605 EVP_PKEY_DSA,
606 EVP_PKEY_DSA,
607 0,
608
609 "DSA",
610 "OpenSSL DSA method",
611
612 dsa_pub_decode,
613 dsa_pub_encode,
614 dsa_pub_cmp,
615 dsa_pub_print,
616
617 dsa_priv_decode,
618 dsa_priv_encode,
619 dsa_priv_print,
620
621 int_dsa_size,
622 dsa_bits,
623 dsa_security_bits,
624
625 dsa_param_decode,
626 dsa_param_encode,
627 dsa_missing_parameters,
628 dsa_copy_parameters,
629 dsa_cmp_parameters,
630 dsa_param_print,
631 dsa_sig_print,
632
633 int_dsa_free,
634 dsa_pkey_ctrl,
635 old_dsa_priv_decode,
636 old_dsa_priv_encode,
637
638 NULL, NULL, NULL,
639 NULL, NULL, NULL,
640 NULL, NULL, NULL, NULL,
641
642 dsa_pkey_dirty_cnt,
643 dsa_pkey_export_to
644 }
645};
646