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448be743 DSH |
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> | |
18e377b4 | 63 | #include "asn1_locl.h" |
448be743 DSH |
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 | if (ptype != V_ASN1_SEQUENCE) | |
82 | { | |
83 | DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR); | |
84 | goto err; | |
85 | } | |
86 | ||
87 | pstr = pval; | |
88 | pm = pstr->data; | |
89 | pmlen = pstr->length; | |
90 | ||
91 | if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen))) | |
92 | { | |
93 | DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR); | |
94 | goto err; | |
95 | } | |
96 | ||
97 | if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) | |
98 | { | |
99 | DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR); | |
100 | goto err; | |
101 | } | |
102 | ||
103 | /* We have parameters now set public key */ | |
104 | if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) | |
105 | { | |
106 | DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR); | |
107 | goto err; | |
108 | } | |
109 | ||
110 | ASN1_INTEGER_free(public_key); | |
111 | ||
112 | return 1; | |
113 | ||
114 | err: | |
115 | if (pubkey) | |
116 | ASN1_INTEGER_free(public_key); | |
117 | if (dsa) | |
118 | DSA_free(dsa); | |
119 | return 0; | |
120 | ||
121 | } | |
122 | ||
6f81892e | 123 | static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) |
448be743 DSH |
124 | { |
125 | DSA *dsa; | |
126 | void *pval; | |
127 | int ptype; | |
128 | unsigned char *penc = NULL; | |
129 | int penclen; | |
130 | ||
131 | dsa=pkey->pkey.dsa; | |
132 | if (pkey->save_parameters) | |
133 | { | |
134 | ASN1_STRING *str; | |
135 | str = ASN1_STRING_new(); | |
136 | str->length = i2d_DSAparams(dsa, &str->data); | |
137 | if (str->length <= 0) | |
138 | { | |
139 | DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE); | |
140 | goto err; | |
141 | } | |
142 | ptype = V_ASN1_SEQUENCE; | |
143 | } | |
144 | else | |
145 | { | |
146 | ptype = V_ASN1_UNDEF; | |
147 | pval = NULL; | |
148 | } | |
149 | dsa->write_params=0; | |
150 | ||
151 | penclen = i2d_DSAPublicKey(dsa, &penc); | |
152 | ||
153 | if (penclen <= 0) | |
154 | { | |
155 | DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE); | |
156 | goto err; | |
157 | } | |
158 | ||
159 | if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA), | |
160 | ptype, pval, penc, penclen)) | |
161 | return 1; | |
162 | ||
163 | err: | |
164 | if (penc) | |
165 | OPENSSL_free(penc); | |
166 | if (pval) | |
167 | ASN1_STRING_free(pval); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
6f81892e DSH |
172 | static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
173 | { | |
174 | if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0) | |
175 | return 0; | |
176 | else | |
177 | return 1; | |
178 | } | |
179 | ||
448be743 DSH |
180 | /* In PKCS#8 DSA: you just get a private key integer and parameters in the |
181 | * AlgorithmIdentifier the pubkey must be recalculated. | |
182 | */ | |
183 | ||
184 | static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) | |
185 | { | |
186 | const unsigned char *p, *pm; | |
187 | int pklen, pmlen; | |
188 | int ptype; | |
189 | void *pval; | |
190 | ASN1_STRING *pstr; | |
191 | X509_ALGOR *palg; | |
192 | ASN1_INTEGER *privkey = NULL; | |
193 | BN_CTX *ctx = NULL; | |
194 | ||
195 | STACK_OF(ASN1_TYPE) *ndsa = NULL; | |
196 | DSA *dsa = NULL; | |
197 | ||
198 | if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) | |
199 | return 0; | |
200 | X509_ALGOR_get0(NULL, &ptype, &pval, palg); | |
201 | ||
202 | /* Check for broken DSA PKCS#8, UGH! */ | |
203 | if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED)) | |
204 | { | |
205 | ASN1_TYPE *t1, *t2; | |
206 | if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pklen, | |
207 | d2i_ASN1_TYPE, | |
208 | ASN1_TYPE_free))) | |
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 | sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free); | |
285 | DSA_free(dsa); | |
286 | EVP_PKEY_free(pkey); | |
287 | return 0; | |
288 | } | |
289 | ||
6f81892e | 290 | static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) |
448be743 DSH |
291 | { |
292 | ASN1_STRING *params = NULL; | |
293 | ASN1_INTEGER *prkey = NULL; | |
294 | unsigned char *dp = NULL; | |
295 | int dplen; | |
296 | ||
297 | params = ASN1_STRING_new(); | |
298 | ||
299 | if (!params) | |
300 | { | |
301 | DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); | |
302 | goto err; | |
303 | } | |
304 | ||
305 | params->length = i2d_DSAparams(pkey->pkey.dsa, ¶ms->data); | |
306 | if (params->length <= 0) | |
307 | { | |
308 | DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); | |
309 | goto err; | |
310 | } | |
311 | params->type = V_ASN1_SEQUENCE; | |
312 | ||
313 | /* Get private key into integer */ | |
314 | prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL); | |
315 | ||
316 | if (!prkey) | |
317 | { | |
318 | DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR); | |
319 | goto err; | |
320 | } | |
321 | ||
322 | dplen = i2d_ASN1_INTEGER(prkey, &dp); | |
323 | ||
324 | ASN1_INTEGER_free(prkey); | |
325 | ||
326 | if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0, | |
327 | V_ASN1_SEQUENCE, params, dp, dplen)) | |
328 | goto err; | |
329 | ||
330 | return 1; | |
331 | ||
332 | err: | |
333 | if (dp != NULL) | |
334 | OPENSSL_free(dp); | |
335 | if (params != NULL) | |
336 | ASN1_STRING_free(params); | |
337 | if (prkey != NULL) | |
338 | ASN1_INTEGER_free(prkey); | |
339 | return 0; | |
340 | } | |
341 | ||
6f81892e DSH |
342 | static int int_dsa_size(const EVP_PKEY *pkey) |
343 | { | |
344 | return(DSA_size(pkey->pkey.dsa)); | |
345 | } | |
346 | ||
347 | static int dsa_bits(const EVP_PKEY *pkey) | |
348 | { | |
349 | return BN_num_bits(pkey->pkey.dsa->p); | |
350 | } | |
351 | ||
352 | static int dsa_missing_parameters(const EVP_PKEY *pkey) | |
353 | { | |
354 | DSA *dsa; | |
355 | dsa=pkey->pkey.dsa; | |
356 | if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL)) | |
357 | return 1; | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) | |
362 | { | |
363 | BIGNUM *a; | |
364 | ||
365 | if ((a=BN_dup(from->pkey.dsa->p)) == NULL) | |
366 | return 0; | |
367 | if (to->pkey.dsa->p != NULL) | |
368 | BN_free(to->pkey.dsa->p); | |
369 | to->pkey.dsa->p=a; | |
370 | ||
371 | if ((a=BN_dup(from->pkey.dsa->q)) == NULL) | |
372 | return 0; | |
373 | if (to->pkey.dsa->q != NULL) | |
374 | BN_free(to->pkey.dsa->q); | |
375 | to->pkey.dsa->q=a; | |
376 | ||
377 | if ((a=BN_dup(from->pkey.dsa->g)) == NULL) | |
378 | return 0; | |
379 | if (to->pkey.dsa->g != NULL) | |
380 | BN_free(to->pkey.dsa->g); | |
381 | to->pkey.dsa->g=a; | |
382 | return 1; | |
383 | } | |
384 | ||
385 | static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) | |
386 | { | |
387 | if ( BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) || | |
388 | BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) || | |
389 | BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g)) | |
390 | return 0; | |
391 | else | |
392 | return 1; | |
393 | } | |
394 | ||
395 | static void int_dsa_free(EVP_PKEY *pkey) | |
396 | { | |
397 | DSA_free(pkey->pkey.dsa); | |
398 | } | |
399 | ||
35208f36 DSH |
400 | static void update_buflen(const BIGNUM *b, size_t *pbuflen) |
401 | { | |
402 | int i; | |
403 | if (!b) | |
404 | return; | |
405 | if (*pbuflen < (i = (size_t)BN_num_bytes(b))) | |
406 | *pbuflen = i; | |
407 | } | |
408 | ||
409 | int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype) | |
410 | { | |
411 | unsigned char *m=NULL; | |
412 | int ret=0; | |
413 | size_t buf_len=0; | |
414 | const char *ktype = NULL; | |
415 | ||
416 | const BIGNUM *priv_key, *pub_key; | |
417 | ||
418 | if (ptype == 2) | |
419 | priv_key = x->priv_key; | |
420 | else | |
421 | priv_key = NULL; | |
422 | ||
423 | if (ptype > 0) | |
424 | pub_key = x->pub_key; | |
425 | else | |
426 | pub_key = NULL; | |
427 | ||
428 | if (ptype == 2) | |
429 | ktype = "Private-Key"; | |
430 | else if (ptype == 1) | |
431 | ktype = "Public-Key"; | |
432 | else | |
433 | ktype = "DSA-Parameters"; | |
434 | ||
435 | if (x->p == NULL) | |
436 | { | |
437 | DSAerr(DSA_F_DSA_PRINT,DSA_R_MISSING_PARAMETERS); | |
438 | goto err; | |
439 | } | |
440 | ||
441 | update_buflen(x->p, &buf_len); | |
442 | update_buflen(x->q, &buf_len); | |
443 | update_buflen(x->g, &buf_len); | |
444 | update_buflen(priv_key, &buf_len); | |
445 | update_buflen(pub_key, &buf_len); | |
446 | ||
447 | m=(unsigned char *)OPENSSL_malloc(buf_len+10); | |
448 | if (m == NULL) | |
449 | { | |
450 | DSAerr(DSA_F_DSA_PRINT,ERR_R_MALLOC_FAILURE); | |
451 | goto err; | |
452 | } | |
453 | ||
454 | if (priv_key) | |
455 | { | |
456 | if(!BIO_indent(bp,off,128)) | |
457 | goto err; | |
458 | if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p)) | |
459 | <= 0) goto err; | |
460 | } | |
461 | ||
462 | if (!ASN1_bn_print(bp,"priv:",priv_key,m,off)) | |
463 | goto err; | |
464 | if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off)) | |
465 | goto err; | |
466 | if (!ASN1_bn_print(bp,"P: ",x->p,m,off)) goto err; | |
467 | if (!ASN1_bn_print(bp,"Q: ",x->q,m,off)) goto err; | |
468 | if (!ASN1_bn_print(bp,"G: ",x->g,m,off)) goto err; | |
469 | ret=1; | |
470 | err: | |
471 | if (m != NULL) OPENSSL_free(m); | |
472 | return(ret); | |
473 | } | |
474 | ||
475 | ||
476 | static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
477 | ASN1_PCTX *ctx) | |
478 | { | |
479 | return do_dsa_print(bp, pkey->pkey.dsa, indent, 0); | |
480 | } | |
481 | ||
482 | static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
483 | ASN1_PCTX *ctx) | |
484 | { | |
485 | return do_dsa_print(bp, pkey->pkey.dsa, indent, 1); | |
486 | } | |
487 | ||
488 | ||
489 | static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
490 | ASN1_PCTX *ctx) | |
491 | { | |
492 | return do_dsa_print(bp, pkey->pkey.dsa, indent, 2); | |
493 | } | |
494 | ||
448be743 DSH |
495 | /* NB these are sorted in pkey_id order, lowest first */ |
496 | ||
497 | const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] = | |
498 | { | |
499 | ||
500 | { | |
501 | EVP_PKEY_DSA2, | |
502 | EVP_PKEY_DSA, | |
503 | ASN1_PKEY_ALIAS | |
504 | }, | |
505 | ||
506 | { | |
507 | EVP_PKEY_DSA1, | |
508 | EVP_PKEY_DSA, | |
509 | ASN1_PKEY_ALIAS | |
510 | }, | |
511 | ||
512 | { | |
513 | EVP_PKEY_DSA4, | |
514 | EVP_PKEY_DSA, | |
515 | ASN1_PKEY_ALIAS | |
516 | }, | |
517 | ||
518 | { | |
519 | EVP_PKEY_DSA3, | |
520 | EVP_PKEY_DSA, | |
521 | ASN1_PKEY_ALIAS | |
522 | }, | |
523 | ||
524 | { | |
525 | EVP_PKEY_DSA, | |
526 | EVP_PKEY_DSA, | |
527 | 0, | |
6f81892e | 528 | |
448be743 DSH |
529 | dsa_pub_decode, |
530 | dsa_pub_encode, | |
6f81892e | 531 | dsa_pub_cmp, |
35208f36 | 532 | dsa_pub_print, |
6f81892e | 533 | |
448be743 DSH |
534 | dsa_priv_decode, |
535 | dsa_priv_encode, | |
35208f36 | 536 | dsa_priv_print, |
6f81892e DSH |
537 | |
538 | int_dsa_size, | |
539 | dsa_bits, | |
540 | ||
541 | 0,0, | |
542 | dsa_missing_parameters, | |
543 | dsa_copy_parameters, | |
544 | dsa_cmp_parameters, | |
35208f36 | 545 | dsa_param_print, |
6f81892e DSH |
546 | |
547 | int_dsa_free, | |
448be743 DSH |
548 | 0 |
549 | } | |
550 | }; | |
551 |