1 /* Written by Dr Stephen N Henson (steve@openssl.org) 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/dh.h>
63 #include <openssl/bn.h>
64 #include "asn1_locl.h"
65
66 static void int_dh_free(EVP_PKEY *pkey)
67 {
68 DH_free(pkey->pkey.dh);
69 }
70
71 static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
72 {
73 const unsigned char *p, *pm;
74 int pklen, pmlen;
75 int ptype;
76 void *pval;
77 ASN1_STRING *pstr;
78 X509_ALGOR *palg;
79 ASN1_INTEGER *public_key = NULL;
80
81 DH *dh = NULL;
82
83 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
84 return 0;
85 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
86
87 if (ptype != V_ASN1_SEQUENCE)
88 {
89 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
90 goto err;
91 }
92
93 pstr = pval;
94 pm = pstr->data;
95 pmlen = pstr->length;
96
97 if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
98 {
99 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
100 goto err;
101 }
102
103 if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
104 {
105 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
106 goto err;
107 }
108
109 /* We have parameters now set public key */
110 if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
111 {
112 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
113 goto err;
114 }
115
116 ASN1_INTEGER_free(public_key);
117 EVP_PKEY_assign_DH(pkey, dh);
118 return 1;
119
120 err:
121 if (public_key)
122 ASN1_INTEGER_free(public_key);
123 if (dh)
124 DH_free(dh);
125 return 0;
126
127 }
128
129 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
130 {
131 DH *dh;
132 void *pval = NULL;
133 int ptype;
134 unsigned char *penc = NULL;
135 int penclen;
136 ASN1_STRING *str;
137 ASN1_INTEGER *pub_key = NULL;
138
139 dh=pkey->pkey.dh;
140
141 str = ASN1_STRING_new();
142 str->length = i2d_DHparams(dh, &str->data);
143 if (str->length <= 0)
144 {
145 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
146 goto err;
147 }
148 pval = str;
149 ptype = V_ASN1_SEQUENCE;
150
151 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
152 if (!pub_key)
153 goto err;
154
155 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
156
157 ASN1_INTEGER_free(pub_key);
158
159 if (penclen <= 0)
160 {
161 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
162 goto err;
163 }
164
165 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH),
166 ptype, pval, penc, penclen))
167 return 1;
168
169 err:
170 if (penc)
171 OPENSSL_free(penc);
172 if (pval)
173 ASN1_STRING_free(pval);
174
175 return 0;
176 }
177
178
179 /* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
180 * that the AlgorithmIdentifier contains the paramaters, the private key
181 * is explcitly included and the pubkey must be recalculated.
182 */
183
184 static int dh_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
194 DH *dh = NULL;
195
196 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
197 return 0;
198
199 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
200
201 if (ptype != V_ASN1_SEQUENCE)
202 goto decerr;
203
204 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
205 goto decerr;
206
207
208 pstr = pval;
209 pm = pstr->data;
210 pmlen = pstr->length;
211 if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
212 goto decerr;
213 /* We have parameters now set private key */
214 if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
215 {
216 DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR);
217 goto dherr;
218 }
219 /* Calculate public key */
220 if (!DH_generate_key(dh))
221 goto dherr;
222
223 EVP_PKEY_assign_DH(pkey, dh);
224
225 ASN1_INTEGER_free(privkey);
226
227 return 1;
228
229 decerr:
230 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
231 dherr:
232 DH_free(dh);
233 return 0;
234 }
235
236 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
237 {
238 ASN1_STRING *params = NULL;
239 ASN1_INTEGER *prkey = NULL;
240 unsigned char *dp = NULL;
241 int dplen;
242
243 params = ASN1_STRING_new();
244
245 if (!params)
246 {
247 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
248 goto err;
249 }
250
251 params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data);
252 if (params->length <= 0)
253 {
254 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
255 goto err;
256 }
257 params->type = V_ASN1_SEQUENCE;
258
259 /* Get private key into integer */
260 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
261
262 if (!prkey)
263 {
264 DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR);
265 goto err;
266 }
267
268 dplen = i2d_ASN1_INTEGER(prkey, &dp);
269
270 ASN1_INTEGER_free(prkey);
271
272 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0,
273 V_ASN1_SEQUENCE, params, dp, dplen))
274 goto err;
275
276 return 1;
277
278 err:
279 if (dp != NULL)
280 OPENSSL_free(dp);
281 if (params != NULL)
282 ASN1_STRING_free(params);
283 if (prkey != NULL)
284 ASN1_INTEGER_free(prkey);
285 return 0;
286 }
287
288
289 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
290 {
291 size_t i;
292 if (!b)
293 return;
294 if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
295 *pbuflen = i;
296 }
297
298 static int dh_param_decode(EVP_PKEY *pkey,
299 const unsigned char **pder, int derlen)
300 {
301 DH *dh;
302 if (!(dh = d2i_DHparams(NULL, pder, derlen)))
303 {
304 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
305 return 0;
306 }
307 EVP_PKEY_assign_DH(pkey, dh);
308 return 1;
309 }
310
311 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
312 {
313 return i2d_DHparams(pkey->pkey.dh, pder);
314 }
315
316 static int do_dh_print(BIO *bp, const DH *x, int indent,
317 ASN1_PCTX *ctx, int ptype)
318 {
319 unsigned char *m=NULL;
320 int reason=ERR_R_BUF_LIB,ret=0;
321 size_t buf_len=0;
322
323 const char *ktype = NULL;
324
325 BIGNUM *priv_key, *pub_key;
326
327 if (ptype == 2)
328 priv_key = x->priv_key;
329 else
330 priv_key = NULL;
331
332 if (ptype > 0)
333 pub_key = x->pub_key;
334 else
335 pub_key = NULL;
336
337 update_buflen(x->p, &buf_len);
338
339 if (buf_len == 0)
340 {
341 reason = ERR_R_PASSED_NULL_PARAMETER;
342 goto err;
343 }
344
345 update_buflen(x->g, &buf_len);
346 update_buflen(pub_key, &buf_len);
347 update_buflen(priv_key, &buf_len);
348
349 if (ptype == 2)
350 ktype = "PKCS#3 DH Private-Key";
351 else if (ptype == 1)
352 ktype = "PKCS#3 DH Public-Key";
353 else
354 ktype = "PKCS#3 DH Parameters";
355
356 m= OPENSSL_malloc(buf_len+10);
357 if (m == NULL)
358 {
359 reason=ERR_R_MALLOC_FAILURE;
360 goto err;
361 }
362
363 BIO_indent(bp, indent, 128);
364 if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
365 goto err;
366 indent += 4;
367
368 if (!ASN1_bn_print(bp,"private-key:",priv_key,m,indent)) goto err;
369 if (!ASN1_bn_print(bp,"public-key:",pub_key,m,indent)) goto err;
370
371 if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err;
372 if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err;
373 if (x->length != 0)
374 {
375 BIO_indent(bp, indent, 128);
376 if (BIO_printf(bp,"recommended-private-length: %d bits\n",
377 (int)x->length) <= 0) goto err;
378 }
379
380
381 ret=1;
382 if (0)
383 {
384 err:
385 DHerr(DH_F_DO_DH_PRINT,reason);
386 }
387 if (m != NULL) OPENSSL_free(m);
388 return(ret);
389 }
390
391 static int int_dh_size(const EVP_PKEY *pkey)
392 {
393 return(DH_size(pkey->pkey.dh));
394 }
395
396 static int dh_bits(const EVP_PKEY *pkey)
397 {
398 return BN_num_bits(pkey->pkey.dh->p);
399 }
400
401 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
402 {
403 if ( BN_cmp(a->pkey.dh->p,b->pkey.dh->p) ||
404 BN_cmp(a->pkey.dh->g,b->pkey.dh->g))
405 return 0;
406 else
407 return 1;
408 }
409
410 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
411 {
412 BIGNUM *a;
413
414 if ((a=BN_dup(from->pkey.dh->p)) == NULL)
415 return 0;
416 if (to->pkey.dh->p != NULL)
417 BN_free(to->pkey.dh->p);
418 to->pkey.dh->p=a;
419
420 if ((a=BN_dup(from->pkey.dh->g)) == NULL)
421 return 0;
422 if (to->pkey.dh->g != NULL)
423 BN_free(to->pkey.dh->g);
424 to->pkey.dh->g=a;
425
426 return 1;
427 }
428
429 static int dh_missing_parameters(const EVP_PKEY *a)
430 {
431 if (!a->pkey.dh->p || !a->pkey.dh->g)
432 return 1;
433 return 0;
434 }
435
436 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
437 {
438 if (dh_cmp_parameters(a, b) == 0)
439 return 0;
440 if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->pub_key) != 0)
441 return 0;
442 else
443 return 1;
444 }
445
446 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
447 ASN1_PCTX *ctx)
448 {
449 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
450 }
451
452 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
453 ASN1_PCTX *ctx)
454 {
455 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
456 }
457
458 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
459 ASN1_PCTX *ctx)
460 {
461 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
462 }
463
464 int DHparams_print(BIO *bp, const DH *x)
465 {
466 return do_dh_print(bp, x, 4, NULL, 0);
467 }
468
469 const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
470 {
471 EVP_PKEY_DH,
472 EVP_PKEY_DH,
473 0,
474
475 "DH",
476 "OpenSSL PKCS#3 DH method",
477
478 dh_pub_decode,
479 dh_pub_encode,
480 dh_pub_cmp,
481 dh_public_print,
482
483 dh_priv_decode,
484 dh_priv_encode,
485 dh_private_print,
486
487 int_dh_size,
488 dh_bits,
489
490 dh_param_decode,
491 dh_param_encode,
492 dh_missing_parameters,
493 dh_copy_parameters,
494 dh_cmp_parameters,
495 dh_param_print,
496 0,
497
498 int_dh_free,
499 0
500 };