add support for DSA with SHA2
[openssl.git] / crypto / dsa / dsa_ameth.c
1 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
2  * project 2006.
3  */
4 /* ====================================================================
5  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer. 
13  *
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in
16  *    the documentation and/or other materials provided with the
17  *    distribution.
18  *
19  * 3. All advertising materials mentioning features or use of this
20  *    software must display the following acknowledgment:
21  *    "This product includes software developed by the OpenSSL Project
22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23  *
24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25  *    endorse or promote products derived from this software without
26  *    prior written permission. For written permission, please contact
27  *    licensing@OpenSSL.org.
28  *
29  * 5. Products derived from this software may not be called "OpenSSL"
30  *    nor may "OpenSSL" appear in their names without prior written
31  *    permission of the OpenSSL Project.
32  *
33  * 6. Redistributions of any form whatsoever must retain the following
34  *    acknowledgment:
35  *    "This product includes software developed by the OpenSSL Project
36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37  *
38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49  * OF THE POSSIBILITY OF SUCH DAMAGE.
50  * ====================================================================
51  *
52  * This product includes cryptographic software written by Eric Young
53  * (eay@cryptsoft.com).  This product includes software written by Tim
54  * Hudson (tjh@cryptsoft.com).
55  *
56  */
57
58 #include <stdio.h>
59 #include "cryptlib.h"
60 #include <openssl/x509.h>
61 #include <openssl/asn1.h>
62 #include <openssl/dsa.h>
63 #include "asn1_locl.h"
64
65 static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
66         {
67         const unsigned char *p, *pm;
68         int pklen, pmlen;
69         int ptype;
70         void *pval;
71         ASN1_STRING *pstr;
72         X509_ALGOR *palg;
73         ASN1_INTEGER *public_key = NULL;
74
75         DSA *dsa = NULL;
76
77         if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
78                 return 0;
79         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
80
81
82         if (ptype == V_ASN1_SEQUENCE)
83                 {
84                 pstr = pval;    
85                 pm = pstr->data;
86                 pmlen = pstr->length;
87
88                 if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
89                         {
90                         DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
91                         goto err;
92                         }
93
94                 }
95         else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF))
96                 {
97                 if (!(dsa = DSA_new()))
98                         {
99                         DSAerr(DSA_F_DSA_PUB_DECODE, ERR_R_MALLOC_FAILURE);
100                         goto err;
101                         }
102                 }
103         else
104                 {
105                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
106                 goto err;
107                 }
108
109         if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
110                 {
111                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
112                 goto err;
113                 }
114
115         if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
116                 {
117                 DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
118                 goto err;
119                 }
120
121         ASN1_INTEGER_free(public_key);
122         EVP_PKEY_assign_DSA(pkey, dsa);
123         return 1;
124
125         err:
126         if (pubkey)
127                 ASN1_INTEGER_free(public_key);
128         if (dsa)
129                 DSA_free(dsa);
130         return 0;
131
132         }
133
134 static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
135         {
136         DSA *dsa;
137         void *pval = NULL;
138         int ptype;
139         unsigned char *penc = NULL;
140         int penclen;
141
142         dsa=pkey->pkey.dsa;
143         if (pkey->save_parameters && dsa->p && dsa->q && dsa->g)
144                 {
145                 ASN1_STRING *str;
146                 str = ASN1_STRING_new();
147                 str->length = i2d_DSAparams(dsa, &str->data);
148                 if (str->length <= 0)
149                         {
150                         DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
151                         goto err;
152                         }
153                 pval = str;
154                 ptype = V_ASN1_SEQUENCE;
155                 }
156         else
157                 ptype = V_ASN1_UNDEF;
158
159         dsa->write_params=0;
160
161         penclen = i2d_DSAPublicKey(dsa, &penc);
162
163         if (penclen <= 0)
164                 {
165                 DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
166                 goto err;
167                 }
168
169         if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
170                                 ptype, pval, penc, penclen))
171                 return 1;
172
173         err:
174         if (penc)
175                 OPENSSL_free(penc);
176         if (pval)
177                 ASN1_STRING_free(pval);
178
179         return 0;
180         }
181
182 /* In PKCS#8 DSA: you just get a private key integer and parameters in the
183  * AlgorithmIdentifier the pubkey must be recalculated.
184  */
185         
186 static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
187         {
188         const unsigned char *p, *pm;
189         int pklen, pmlen;
190         int ptype;
191         void *pval;
192         ASN1_STRING *pstr;
193         X509_ALGOR *palg;
194         ASN1_INTEGER *privkey = NULL;
195         BN_CTX *ctx = NULL;
196
197         STACK_OF(ASN1_TYPE) *ndsa = NULL;
198         DSA *dsa = NULL;
199
200         if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
201                 return 0;
202         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
203
204         /* Check for broken DSA PKCS#8, UGH! */
205         if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
206                 {
207                 ASN1_TYPE *t1, *t2;
208                 if(!(ndsa = d2i_ASN1_SEQUENCE_ANY(NULL, &p, pklen)));
209                         goto decerr;
210                 if (sk_ASN1_TYPE_num(ndsa) != 2)
211                         goto decerr;
212                 /* Handle Two broken types:
213                  * SEQUENCE {parameters, priv_key}
214                  * SEQUENCE {pub_key, priv_key}
215                  */
216
217                 t1 = sk_ASN1_TYPE_value(ndsa, 0);
218                 t2 = sk_ASN1_TYPE_value(ndsa, 1);
219                 if (t1->type == V_ASN1_SEQUENCE)
220                         {
221                         p8->broken = PKCS8_EMBEDDED_PARAM;
222                         pval = t1->value.ptr;
223                         }
224                 else if (ptype == V_ASN1_SEQUENCE)
225                         p8->broken = PKCS8_NS_DB;
226                 else
227                         goto decerr;
228
229                 if (t2->type != V_ASN1_INTEGER)
230                         goto decerr;
231
232                 privkey = t2->value.integer;
233                 }
234         else
235                 {
236                 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
237                         goto decerr;
238                 if (ptype != V_ASN1_SEQUENCE)
239                         goto decerr;
240                 }
241
242         pstr = pval;    
243         pm = pstr->data;
244         pmlen = pstr->length;
245         if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
246                 goto decerr;
247         /* We have parameters now set private key */
248         if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
249                 {
250                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
251                 goto dsaerr;
252                 }
253         /* Calculate public key */
254         if (!(dsa->pub_key = BN_new()))
255                 {
256                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
257                 goto dsaerr;
258                 }
259         if (!(ctx = BN_CTX_new()))
260                 {
261                 DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
262                 goto dsaerr;
263                 }
264                         
265         if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
266                 {
267                 DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
268                 goto dsaerr;
269                 }
270
271         EVP_PKEY_assign_DSA(pkey, dsa);
272         BN_CTX_free (ctx);
273         if(ndsa)
274                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
275         else
276                 ASN1_INTEGER_free(privkey);
277
278         return 1;
279
280         decerr:
281         DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
282         dsaerr:
283         BN_CTX_free (ctx);
284         if (privkey)
285                 ASN1_INTEGER_free(privkey);
286         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
287         DSA_free(dsa);
288         return 0;
289         }
290
291 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
292 {
293         ASN1_STRING *params = NULL;
294         ASN1_INTEGER *prkey = NULL;
295         unsigned char *dp = NULL;
296         int dplen;
297
298         params = ASN1_STRING_new();
299
300         if (!params)
301                 {
302                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
303                 goto err;
304                 }
305
306         params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
307         if (params->length <= 0)
308                 {
309                 DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
310                 goto err;
311                 }
312         params->type = V_ASN1_SEQUENCE;
313
314         /* Get private key into integer */
315         prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
316
317         if (!prkey)
318                 {
319                 DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
320                 goto err;
321                 }
322
323         dplen = i2d_ASN1_INTEGER(prkey, &dp);
324
325         ASN1_INTEGER_free(prkey);
326
327         if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
328                                 V_ASN1_SEQUENCE, params, dp, dplen))
329                 goto err;
330
331         return 1;
332
333 err:
334         if (dp != NULL)
335                 OPENSSL_free(dp);
336         if (params != NULL)
337                 ASN1_STRING_free(params);
338         if (prkey != NULL)
339                 ASN1_INTEGER_free(prkey);
340         return 0;
341 }
342
343 static int int_dsa_size(const EVP_PKEY *pkey)
344         {
345         return(DSA_size(pkey->pkey.dsa));
346         }
347
348 static int dsa_bits(const EVP_PKEY *pkey)
349         {
350         return BN_num_bits(pkey->pkey.dsa->p);
351         }
352
353 static int dsa_missing_parameters(const EVP_PKEY *pkey)
354         {
355         DSA *dsa;
356         dsa=pkey->pkey.dsa;
357         if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
358                         return 1;
359         return 0;
360         }
361
362 static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
363         {
364         BIGNUM *a;
365
366         if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
367                 return 0;
368         if (to->pkey.dsa->p != NULL)
369                 BN_free(to->pkey.dsa->p);
370         to->pkey.dsa->p=a;
371
372         if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
373                 return 0;
374         if (to->pkey.dsa->q != NULL)
375                 BN_free(to->pkey.dsa->q);
376         to->pkey.dsa->q=a;
377
378         if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
379                 return 0;
380         if (to->pkey.dsa->g != NULL)
381                 BN_free(to->pkey.dsa->g);
382         to->pkey.dsa->g=a;
383         return 1;
384         }
385
386 static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
387         {
388         if (    BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
389                 BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
390                 BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
391                 return 0;
392         else
393                 return 1;
394         }
395
396 static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
397         {
398         if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
399                 return 0;
400         else
401                 return 1;
402         }
403
404 static void int_dsa_free(EVP_PKEY *pkey)
405         {
406         DSA_free(pkey->pkey.dsa);
407         }
408
409 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
410         {
411         size_t i;
412         if (!b)
413                 return;
414         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
415                         *pbuflen = i;
416         }
417
418 static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
419         {
420         unsigned char *m=NULL;
421         int ret=0;
422         size_t buf_len=0;
423         const char *ktype = NULL;
424
425         const BIGNUM *priv_key, *pub_key;
426
427         if (ptype == 2)
428                 priv_key = x->priv_key;
429         else
430                 priv_key = NULL;
431
432         if (ptype > 0)
433                 pub_key = x->pub_key;
434         else
435                 pub_key = NULL;
436
437         if (ptype == 2)
438                 ktype = "Private-Key";
439         else if (ptype == 1)
440                 ktype = "Public-Key";
441         else
442                 ktype = "DSA-Parameters";
443
444         update_buflen(x->p, &buf_len);
445         update_buflen(x->q, &buf_len);
446         update_buflen(x->g, &buf_len);
447         update_buflen(priv_key, &buf_len);
448         update_buflen(pub_key, &buf_len);
449
450         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
451         if (m == NULL)
452                 {
453                 DSAerr(DSA_F_DO_DSA_PRINT,ERR_R_MALLOC_FAILURE);
454                 goto err;
455                 }
456
457         if (priv_key)
458                 {
459                 if(!BIO_indent(bp,off,128))
460                    goto err;
461                 if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
462                         <= 0) goto err;
463                 }
464
465         if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
466                 goto err;
467         if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
468                 goto err;
469         if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
470         if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
471         if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
472         ret=1;
473 err:
474         if (m != NULL) OPENSSL_free(m);
475         return(ret);
476         }
477
478 static int dsa_param_decode(EVP_PKEY *pkey,
479                                         const unsigned char **pder, int derlen)
480         {
481         DSA *dsa;
482         if (!(dsa = d2i_DSAparams(NULL, pder, derlen)))
483                 {
484                 DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
485                 return 0;
486                 }
487         EVP_PKEY_assign_DSA(pkey, dsa);
488         return 1;
489         }
490
491 static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
492         {
493         return i2d_DSAparams(pkey->pkey.dsa, pder);
494         }
495
496 static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
497                                                         ASN1_PCTX *ctx)
498         {
499         return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
500         }
501
502 static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
503                                                         ASN1_PCTX *ctx)
504         {
505         return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
506         }
507
508
509 static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
510                                                         ASN1_PCTX *ctx)
511         {
512         return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
513         }
514
515 static int old_dsa_priv_decode(EVP_PKEY *pkey,
516                                         const unsigned char **pder, int derlen)
517         {
518         DSA *dsa;
519         if (!(dsa = d2i_DSAPrivateKey (NULL, pder, derlen)))
520                 {
521                 DSAerr(DSA_F_OLD_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
522                 return 0;
523                 }
524         EVP_PKEY_assign_DSA(pkey, dsa);
525         return 1;
526         }
527
528 static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
529         {
530         return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
531         }
532
533 static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
534         {
535         switch (op)
536                 {
537                 case ASN1_PKEY_CTRL_PKCS7_SIGN:
538                 if (arg1 == 0)
539                         {
540                         int snid, hnid;
541                         X509_ALGOR *alg1, *alg2;
542                         PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
543                         if (alg1 == NULL || alg1->algorithm == NULL)
544                                 return -1;
545                         hnid = OBJ_obj2nid(alg1->algorithm);
546                         if (hnid == NID_undef)
547                                 return -1;
548                         if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
549                                 return -1; 
550                         X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
551                         }
552                 return 1;
553
554                 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
555                 *(int *)arg2 = NID_sha1;
556                 return 2;
557
558                 default:
559                 return -2;
560
561                 }
562
563         }
564
565 /* NB these are sorted in pkey_id order, lowest first */
566
567 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] = 
568         {
569
570                 {
571                 EVP_PKEY_DSA2,
572                 EVP_PKEY_DSA,
573                 ASN1_PKEY_ALIAS
574                 },
575
576                 {
577                 EVP_PKEY_DSA1,
578                 EVP_PKEY_DSA,
579                 ASN1_PKEY_ALIAS
580                 },
581
582                 {
583                 EVP_PKEY_DSA4,
584                 EVP_PKEY_DSA,
585                 ASN1_PKEY_ALIAS
586                 },
587
588                 {
589                 EVP_PKEY_DSA3,
590                 EVP_PKEY_DSA,
591                 ASN1_PKEY_ALIAS
592                 },
593
594                 {
595                 EVP_PKEY_DSA,
596                 EVP_PKEY_DSA,
597                 0,
598
599                 "DSA",
600                 "OpenSSL DSA method",
601
602                 dsa_pub_decode,
603                 dsa_pub_encode,
604                 dsa_pub_cmp,
605                 dsa_pub_print,
606
607                 dsa_priv_decode,
608                 dsa_priv_encode,
609                 dsa_priv_print,
610
611                 int_dsa_size,
612                 dsa_bits,
613
614                 dsa_param_decode,
615                 dsa_param_encode,
616                 dsa_missing_parameters,
617                 dsa_copy_parameters,
618                 dsa_cmp_parameters,
619                 dsa_param_print,
620
621                 int_dsa_free,
622                 dsa_pkey_ctrl,
623                 old_dsa_priv_decode,
624                 old_dsa_priv_encode
625                 }
626         };
627