1 /*
2 * Copyright 2006-2024 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 /*
11 * DSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <stdio.h>
17 #include <openssl/x509.h>
18 #include <openssl/asn1.h>
19 #include <openssl/bn.h>
20 #include <openssl/core_names.h>
21 #include <openssl/param_build.h>
22 #include "internal/cryptlib.h"
23 #include "crypto/asn1.h"
24 #include "crypto/dsa.h"
25 #include "crypto/evp.h"
26 #include "internal/ffc.h"
27 #include "dsa_local.h"
28
dsa_pub_decode(EVP_PKEY * pkey,const X509_PUBKEY * pubkey)29 static int dsa_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
30 {
31 const unsigned char *p, *pm;
32 int pklen, pmlen;
33 int ptype;
34 const void *pval;
35 const ASN1_STRING *pstr;
36 X509_ALGOR *palg;
37 ASN1_INTEGER *public_key = NULL;
38
39 DSA *dsa = NULL;
40
41 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
42 return 0;
43 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
44
45 if (ptype == V_ASN1_SEQUENCE) {
46 pstr = pval;
47 pm = pstr->data;
48 pmlen = pstr->length;
49
50 if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL) {
51 ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR);
52 goto err;
53 }
54
55 } else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF)) {
56 if ((dsa = DSA_new()) == NULL) {
57 ERR_raise(ERR_LIB_DSA, ERR_R_DSA_LIB);
58 goto err;
59 }
60 } else {
61 ERR_raise(ERR_LIB_DSA, DSA_R_PARAMETER_ENCODING_ERROR);
62 goto err;
63 }
64
65 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
66 ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR);
67 goto err;
68 }
69
70 if ((dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
71 ERR_raise(ERR_LIB_DSA, DSA_R_BN_DECODE_ERROR);
72 goto err;
73 }
74
75 dsa->dirty_cnt++;
76 ASN1_INTEGER_free(public_key);
77 EVP_PKEY_assign_DSA(pkey, dsa);
78 return 1;
79
80 err:
81 ASN1_INTEGER_free(public_key);
82 DSA_free(dsa);
83 return 0;
84
85 }
86
dsa_pub_encode(X509_PUBKEY * pk,const EVP_PKEY * pkey)87 static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
88 {
89 DSA *dsa;
90 int ptype;
91 unsigned char *penc = NULL;
92 int penclen;
93 ASN1_STRING *str = NULL;
94 ASN1_INTEGER *pubint = NULL;
95 ASN1_OBJECT *aobj;
96
97 dsa = pkey->pkey.dsa;
98 if (pkey->save_parameters
99 && dsa->params.p != NULL
100 && dsa->params.q != NULL
101 && dsa->params.g != NULL) {
102 str = ASN1_STRING_new();
103 if (str == NULL) {
104 ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
105 goto err;
106 }
107 str->length = i2d_DSAparams(dsa, &str->data);
108 if (str->length <= 0) {
109 ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
110 goto err;
111 }
112 ptype = V_ASN1_SEQUENCE;
113 } else
114 ptype = V_ASN1_UNDEF;
115
116 pubint = BN_to_ASN1_INTEGER(dsa->pub_key, NULL);
117
118 if (pubint == NULL) {
119 ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
120 goto err;
121 }
122
123 penclen = i2d_ASN1_INTEGER(pubint, &penc);
124 ASN1_INTEGER_free(pubint);
125
126 if (penclen <= 0) {
127 ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
128 goto err;
129 }
130
131 aobj = OBJ_nid2obj(EVP_PKEY_DSA);
132 if (aobj == NULL)
133 goto err;
134
135 if (X509_PUBKEY_set0_param(pk, aobj, ptype, str, penc, penclen))
136 return 1;
137
138 err:
139 OPENSSL_free(penc);
140 ASN1_STRING_free(str);
141
142 return 0;
143 }
144
145 /*
146 * In PKCS#8 DSA: you just get a private key integer and parameters in the
147 * AlgorithmIdentifier the pubkey must be recalculated.
148 */
149
dsa_priv_decode(EVP_PKEY * pkey,const PKCS8_PRIV_KEY_INFO * p8)150 static int dsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
151 {
152 int ret = 0;
153 DSA *dsa = ossl_dsa_key_from_pkcs8(p8, NULL, NULL);
154
155 if (dsa != NULL) {
156 ret = 1;
157 EVP_PKEY_assign_DSA(pkey, dsa);
158 }
159
160 return ret;
161 }
162
dsa_priv_encode(PKCS8_PRIV_KEY_INFO * p8,const EVP_PKEY * pkey)163 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
164 {
165 ASN1_STRING *params = NULL;
166 ASN1_INTEGER *prkey = NULL;
167 unsigned char *dp = NULL;
168 int dplen;
169
170 if (pkey->pkey.dsa == NULL|| pkey->pkey.dsa->priv_key == NULL) {
171 ERR_raise(ERR_LIB_DSA, DSA_R_MISSING_PARAMETERS);
172 goto err;
173 }
174
175 params = ASN1_STRING_new();
176
177 if (params == NULL) {
178 ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
179 goto err;
180 }
181
182 params->length = i2d_DSAparams(pkey->pkey.dsa, ¶ms->data);
183 if (params->length <= 0) {
184 ERR_raise(ERR_LIB_DSA, ERR_R_ASN1_LIB);
185 goto err;
186 }
187 params->type = V_ASN1_SEQUENCE;
188
189 /* Get private key into integer */
190 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
191
192 if (prkey == NULL) {
193 ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR);
194 goto err;
195 }
196
197 dplen = i2d_ASN1_INTEGER(prkey, &dp);
198
199 ASN1_STRING_clear_free(prkey);
200
201 if (dplen <= 0) {
202 ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR);
203 goto err;
204 }
205
206 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
207 V_ASN1_SEQUENCE, params, dp, dplen)) {
208 OPENSSL_clear_free(dp, dplen);
209 goto err;
210 }
211 return 1;
212
213 err:
214 ASN1_STRING_free(params);
215 return 0;
216 }
217
int_dsa_size(const EVP_PKEY * pkey)218 static int int_dsa_size(const EVP_PKEY *pkey)
219 {
220 return DSA_size(pkey->pkey.dsa);
221 }
222
dsa_bits(const EVP_PKEY * pkey)223 static int dsa_bits(const EVP_PKEY *pkey)
224 {
225 return DSA_bits(pkey->pkey.dsa);
226 }
227
dsa_security_bits(const EVP_PKEY * pkey)228 static int dsa_security_bits(const EVP_PKEY *pkey)
229 {
230 return DSA_security_bits(pkey->pkey.dsa);
231 }
232
dsa_missing_parameters(const EVP_PKEY * pkey)233 static int dsa_missing_parameters(const EVP_PKEY *pkey)
234 {
235 DSA *dsa;
236 dsa = pkey->pkey.dsa;
237 return dsa == NULL
238 || dsa->params.p == NULL
239 || dsa->params.q == NULL
240 || dsa->params.g == NULL;
241 }
242
dsa_copy_parameters(EVP_PKEY * to,const EVP_PKEY * from)243 static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
244 {
245 if (to->pkey.dsa == NULL) {
246 to->pkey.dsa = DSA_new();
247 if (to->pkey.dsa == NULL)
248 return 0;
249 }
250 if (!ossl_ffc_params_copy(&to->pkey.dsa->params, &from->pkey.dsa->params))
251 return 0;
252
253 to->pkey.dsa->dirty_cnt++;
254 return 1;
255 }
256
dsa_cmp_parameters(const EVP_PKEY * a,const EVP_PKEY * b)257 static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
258 {
259 return ossl_ffc_params_cmp(&a->pkey.dsa->params, &b->pkey.dsa->params, 1);
260 }
261
dsa_pub_cmp(const EVP_PKEY * a,const EVP_PKEY * b)262 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
263 {
264 return BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) == 0;
265 }
266
int_dsa_free(EVP_PKEY * pkey)267 static void int_dsa_free(EVP_PKEY *pkey)
268 {
269 DSA_free(pkey->pkey.dsa);
270 }
271
do_dsa_print(BIO * bp,const DSA * x,int off,int ptype)272 static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
273 {
274 int ret = 0;
275 const char *ktype = NULL;
276 const BIGNUM *priv_key, *pub_key;
277 int mod_len = 0;
278
279 if (x->params.p != NULL)
280 mod_len = DSA_bits(x);
281
282 if (ptype == 2)
283 priv_key = x->priv_key;
284 else
285 priv_key = NULL;
286
287 if (ptype > 0)
288 pub_key = x->pub_key;
289 else
290 pub_key = NULL;
291
292 if (ptype == 2)
293 ktype = "Private-Key";
294 else if (ptype == 1)
295 ktype = "Public-Key";
296 else
297 ktype = "DSA-Parameters";
298
299 if (priv_key != NULL) {
300 if (!BIO_indent(bp, off, 128))
301 goto err;
302 if (BIO_printf(bp, "%s: (%d bit)\n", ktype, mod_len) <= 0)
303 goto err;
304 } else {
305 if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
306 goto err;
307 }
308
309 if (!ASN1_bn_print(bp, "priv:", priv_key, NULL, off))
310 goto err;
311 if (!ASN1_bn_print(bp, "pub: ", pub_key, NULL, off))
312 goto err;
313 if (!ossl_ffc_params_print(bp, &x->params, off))
314 goto err;
315 ret = 1;
316 err:
317 return ret;
318 }
319
dsa_param_decode(EVP_PKEY * pkey,const unsigned char ** pder,int derlen)320 static int dsa_param_decode(EVP_PKEY *pkey,
321 const unsigned char **pder, int derlen)
322 {
323 DSA *dsa;
324
325 if ((dsa = d2i_DSAparams(NULL, pder, derlen)) == NULL)
326 return 0;
327
328 dsa->dirty_cnt++;
329 EVP_PKEY_assign_DSA(pkey, dsa);
330 return 1;
331 }
332
dsa_param_encode(const EVP_PKEY * pkey,unsigned char ** pder)333 static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
334 {
335 return i2d_DSAparams(pkey->pkey.dsa, pder);
336 }
337
dsa_param_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)338 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
339 ASN1_PCTX *ctx)
340 {
341 return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
342 }
343
dsa_pub_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)344 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
345 ASN1_PCTX *ctx)
346 {
347 return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
348 }
349
dsa_priv_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)350 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
351 ASN1_PCTX *ctx)
352 {
353 return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
354 }
355
old_dsa_priv_decode(EVP_PKEY * pkey,const unsigned char ** pder,int derlen)356 static int old_dsa_priv_decode(EVP_PKEY *pkey,
357 const unsigned char **pder, int derlen)
358 {
359 DSA *dsa;
360
361 if ((dsa = d2i_DSAPrivateKey(NULL, pder, derlen)) == NULL) {
362 ERR_raise(ERR_LIB_DSA, ERR_R_DSA_LIB);
363 return 0;
364 }
365 dsa->dirty_cnt++;
366 EVP_PKEY_assign_DSA(pkey, dsa);
367 return 1;
368 }
369
old_dsa_priv_encode(const EVP_PKEY * pkey,unsigned char ** pder)370 static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
371 {
372 return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
373 }
374
dsa_sig_print(BIO * bp,const X509_ALGOR * sigalg,const ASN1_STRING * sig,int indent,ASN1_PCTX * pctx)375 static int dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
376 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
377 {
378 DSA_SIG *dsa_sig;
379 const unsigned char *p;
380
381 if (sig == NULL) {
382 if (BIO_puts(bp, "\n") <= 0)
383 return 0;
384 else
385 return 1;
386 }
387 p = sig->data;
388 dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length);
389 if (dsa_sig != NULL) {
390 int rv = 0;
391 const BIGNUM *r, *s;
392
393 DSA_SIG_get0(dsa_sig, &r, &s);
394
395 if (BIO_write(bp, "\n", 1) != 1)
396 goto err;
397
398 if (!ASN1_bn_print(bp, "r: ", r, NULL, indent))
399 goto err;
400 if (!ASN1_bn_print(bp, "s: ", s, NULL, indent))
401 goto err;
402 rv = 1;
403 err:
404 DSA_SIG_free(dsa_sig);
405 return rv;
406 }
407 if (BIO_puts(bp, "\n") <= 0)
408 return 0;
409 return X509_signature_dump(bp, sig, indent);
410 }
411
dsa_pkey_ctrl(EVP_PKEY * pkey,int op,long arg1,void * arg2)412 static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
413 {
414 switch (op) {
415 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
416 *(int *)arg2 = NID_sha256;
417 return 1;
418
419 default:
420 return -2;
421 }
422 }
423
dsa_pkey_dirty_cnt(const EVP_PKEY * pkey)424 static size_t dsa_pkey_dirty_cnt(const EVP_PKEY *pkey)
425 {
426 return pkey->pkey.dsa->dirty_cnt;
427 }
428
dsa_pkey_export_to(const EVP_PKEY * from,void * to_keydata,OSSL_FUNC_keymgmt_import_fn * importer,OSSL_LIB_CTX * libctx,const char * propq)429 static int dsa_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
430 OSSL_FUNC_keymgmt_import_fn *importer,
431 OSSL_LIB_CTX *libctx, const char *propq)
432 {
433 DSA *dsa = from->pkey.dsa;
434 OSSL_PARAM_BLD *tmpl;
435 const BIGNUM *p = DSA_get0_p(dsa), *g = DSA_get0_g(dsa);
436 const BIGNUM *q = DSA_get0_q(dsa), *pub_key = DSA_get0_pub_key(dsa);
437 const BIGNUM *priv_key = DSA_get0_priv_key(dsa);
438 OSSL_PARAM *params;
439 int selection = 0;
440 int rv = 0;
441
442 if (p == NULL || q == NULL || g == NULL)
443 return 0;
444
445 tmpl = OSSL_PARAM_BLD_new();
446 if (tmpl == NULL)
447 return 0;
448
449 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
450 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q)
451 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g))
452 goto err;
453 selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
454 if (pub_key != NULL) {
455 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY,
456 pub_key))
457 goto err;
458 selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
459 }
460 if (priv_key != NULL) {
461 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY,
462 priv_key))
463 goto err;
464 selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
465 }
466
467 if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
468 goto err;
469
470 /* We export, the provider imports */
471 rv = importer(to_keydata, selection, params);
472
473 OSSL_PARAM_free(params);
474 err:
475 OSSL_PARAM_BLD_free(tmpl);
476 return rv;
477 }
478
dsa_pkey_import_from(const OSSL_PARAM params[],void * vpctx)479 static int dsa_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
480 {
481 EVP_PKEY_CTX *pctx = vpctx;
482 EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
483 DSA *dsa = ossl_dsa_new(pctx->libctx);
484
485 if (dsa == NULL) {
486 ERR_raise(ERR_LIB_DSA, ERR_R_DSA_LIB);
487 return 0;
488 }
489
490 if (!ossl_dsa_ffc_params_fromdata(dsa, params)
491 || !ossl_dsa_key_fromdata(dsa, params, 1)
492 || !EVP_PKEY_assign_DSA(pkey, dsa)) {
493 DSA_free(dsa);
494 return 0;
495 }
496 return 1;
497 }
498
dsa_pkey_copy(EVP_PKEY * to,EVP_PKEY * from)499 static int dsa_pkey_copy(EVP_PKEY *to, EVP_PKEY *from)
500 {
501 DSA *dsa = from->pkey.dsa;
502 DSA *dupkey = NULL;
503 int ret;
504
505 if (dsa != NULL) {
506 dupkey = ossl_dsa_dup(dsa, OSSL_KEYMGMT_SELECT_ALL);
507 if (dupkey == NULL)
508 return 0;
509 }
510
511 ret = EVP_PKEY_assign_DSA(to, dupkey);
512 if (!ret)
513 DSA_free(dupkey);
514 return ret;
515 }
516
517 /* NB these are sorted in pkey_id order, lowest first */
518
519 const EVP_PKEY_ASN1_METHOD ossl_dsa_asn1_meths[4] = {
520
521 /* This aliases NID_dsa with NID_dsa_2 */
522 {
523 EVP_PKEY_DSA1,
524 EVP_PKEY_DSA,
525 ASN1_PKEY_ALIAS},
526
527 /* This aliases NID_dsaWithSHA with NID_dsaWithSHA_2 */
528 {
529 EVP_PKEY_DSA4,
530 EVP_PKEY_DSA2,
531 ASN1_PKEY_ALIAS},
532
533 /* This aliases NID_dsaWithSHA with NID_dsaWithSHA1 */
534 {
535 EVP_PKEY_DSA3,
536 EVP_PKEY_DSA2,
537 ASN1_PKEY_ALIAS},
538
539 {
540 EVP_PKEY_DSA,
541 EVP_PKEY_DSA,
542 0,
543
544 "DSA",
545 "OpenSSL DSA method",
546
547 dsa_pub_decode,
548 dsa_pub_encode,
549 dsa_pub_cmp,
550 dsa_pub_print,
551
552 dsa_priv_decode,
553 dsa_priv_encode,
554 dsa_priv_print,
555
556 int_dsa_size,
557 dsa_bits,
558 dsa_security_bits,
559
560 dsa_param_decode,
561 dsa_param_encode,
562 dsa_missing_parameters,
563 dsa_copy_parameters,
564 dsa_cmp_parameters,
565 dsa_param_print,
566 dsa_sig_print,
567
568 int_dsa_free,
569 dsa_pkey_ctrl,
570 old_dsa_priv_decode,
571 old_dsa_priv_encode,
572
573 NULL, NULL, NULL,
574 NULL, NULL, NULL,
575 NULL, NULL, NULL, NULL,
576
577 dsa_pkey_dirty_cnt,
578 dsa_pkey_export_to,
579 dsa_pkey_import_from,
580 dsa_pkey_copy
581 }
582 };
583
