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adbc603d 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/dh.h> | |
18e377b4 | 63 | #include "asn1_locl.h" |
adbc603d DSH |
64 | |
65 | static void int_dh_free(EVP_PKEY *pkey) | |
66 | { | |
67 | DH_free(pkey->pkey.dh); | |
68 | } | |
69 | ||
ceb46789 DSH |
70 | static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) |
71 | { | |
72 | const unsigned char *p, *pm; | |
73 | int pklen, pmlen; | |
74 | int ptype; | |
75 | void *pval; | |
76 | ASN1_STRING *pstr; | |
77 | X509_ALGOR *palg; | |
78 | ASN1_INTEGER *public_key = NULL; | |
79 | ||
80 | DH *dh = NULL; | |
81 | ||
82 | if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) | |
83 | return 0; | |
84 | X509_ALGOR_get0(NULL, &ptype, &pval, palg); | |
85 | ||
86 | if (ptype != V_ASN1_SEQUENCE) | |
87 | { | |
88 | DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR); | |
89 | goto err; | |
90 | } | |
91 | ||
92 | pstr = pval; | |
93 | pm = pstr->data; | |
94 | pmlen = pstr->length; | |
95 | ||
96 | if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) | |
97 | { | |
98 | DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); | |
99 | goto err; | |
100 | } | |
101 | ||
102 | if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) | |
103 | { | |
104 | DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); | |
105 | goto err; | |
106 | } | |
107 | ||
108 | /* We have parameters now set public key */ | |
109 | if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) | |
110 | { | |
111 | DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR); | |
112 | goto err; | |
113 | } | |
114 | ||
115 | ASN1_INTEGER_free(public_key); | |
116 | EVP_PKEY_assign_DH(pkey, dh); | |
117 | return 1; | |
118 | ||
119 | err: | |
120 | if (pubkey) | |
121 | ASN1_INTEGER_free(public_key); | |
122 | if (dh) | |
123 | DH_free(dh); | |
124 | return 0; | |
125 | ||
126 | } | |
127 | ||
128 | static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) | |
129 | { | |
130 | DH *dh; | |
131 | void *pval = NULL; | |
132 | int ptype; | |
133 | unsigned char *penc = NULL; | |
134 | int penclen; | |
135 | ASN1_STRING *str; | |
136 | ASN1_INTEGER *pub_key = NULL; | |
137 | ||
138 | dh=pkey->pkey.dh; | |
139 | ||
140 | str = ASN1_STRING_new(); | |
141 | str->length = i2d_DHparams(dh, &str->data); | |
142 | if (str->length <= 0) | |
143 | { | |
144 | DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); | |
145 | goto err; | |
146 | } | |
147 | pval = str; | |
148 | ptype = V_ASN1_SEQUENCE; | |
149 | ||
150 | pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL); | |
151 | if (!pub_key) | |
152 | goto err; | |
153 | ||
154 | penclen = i2d_ASN1_INTEGER(pub_key, &penc); | |
155 | ||
156 | ASN1_INTEGER_free(pub_key); | |
157 | ||
158 | if (penclen <= 0) | |
159 | { | |
160 | DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); | |
161 | goto err; | |
162 | } | |
163 | ||
164 | if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH), | |
165 | ptype, pval, penc, penclen)) | |
166 | return 1; | |
167 | ||
168 | err: | |
169 | if (penc) | |
170 | OPENSSL_free(penc); | |
171 | if (pval) | |
172 | ASN1_STRING_free(pval); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
4c97a04e DSH |
177 | |
178 | /* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in | |
179 | * that the AlgorithmIdentifier contains the paramaters, the private key | |
180 | * is explcitly included and the pubkey must be recalculated. | |
181 | */ | |
182 | ||
183 | static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) | |
184 | { | |
185 | const unsigned char *p, *pm; | |
186 | int pklen, pmlen; | |
187 | int ptype; | |
188 | void *pval; | |
189 | ASN1_STRING *pstr; | |
190 | X509_ALGOR *palg; | |
191 | ASN1_INTEGER *privkey = NULL; | |
192 | ||
193 | DH *dh = NULL; | |
194 | ||
195 | if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) | |
196 | return 0; | |
197 | ||
198 | X509_ALGOR_get0(NULL, &ptype, &pval, palg); | |
199 | ||
200 | if (ptype != V_ASN1_SEQUENCE) | |
201 | goto decerr; | |
202 | ||
203 | if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen))) | |
204 | goto decerr; | |
205 | ||
206 | ||
207 | pstr = pval; | |
208 | pm = pstr->data; | |
209 | pmlen = pstr->length; | |
210 | if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) | |
211 | goto decerr; | |
212 | /* We have parameters now set private key */ | |
213 | if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) | |
214 | { | |
215 | DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR); | |
216 | goto dherr; | |
217 | } | |
218 | /* Calculate public key */ | |
219 | if (!DH_generate_key(dh)) | |
220 | goto dherr; | |
221 | ||
222 | EVP_PKEY_assign_DH(pkey, dh); | |
223 | ||
224 | ASN1_INTEGER_free(privkey); | |
225 | ||
226 | return 1; | |
227 | ||
228 | decerr: | |
229 | DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR); | |
230 | dherr: | |
231 | DH_free(dh); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) | |
236 | { | |
237 | ASN1_STRING *params = NULL; | |
238 | ASN1_INTEGER *prkey = NULL; | |
239 | unsigned char *dp = NULL; | |
240 | int dplen; | |
241 | ||
242 | params = ASN1_STRING_new(); | |
243 | ||
244 | if (!params) | |
245 | { | |
246 | DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); | |
247 | goto err; | |
248 | } | |
249 | ||
250 | params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data); | |
251 | if (params->length <= 0) | |
252 | { | |
253 | DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); | |
254 | goto err; | |
255 | } | |
256 | params->type = V_ASN1_SEQUENCE; | |
257 | ||
258 | /* Get private key into integer */ | |
259 | prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL); | |
260 | ||
261 | if (!prkey) | |
262 | { | |
3ba0885a | 263 | DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR); |
4c97a04e DSH |
264 | goto err; |
265 | } | |
266 | ||
267 | dplen = i2d_ASN1_INTEGER(prkey, &dp); | |
268 | ||
269 | ASN1_INTEGER_free(prkey); | |
270 | ||
3ba0885a | 271 | if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0, |
4c97a04e DSH |
272 | V_ASN1_SEQUENCE, params, dp, dplen)) |
273 | goto err; | |
274 | ||
275 | return 1; | |
276 | ||
277 | err: | |
278 | if (dp != NULL) | |
279 | OPENSSL_free(dp); | |
280 | if (params != NULL) | |
281 | ASN1_STRING_free(params); | |
282 | if (prkey != NULL) | |
283 | ASN1_INTEGER_free(prkey); | |
284 | return 0; | |
285 | } | |
286 | ||
287 | ||
ceb46789 DSH |
288 | static void update_buflen(const BIGNUM *b, size_t *pbuflen) |
289 | { | |
290 | int i; | |
291 | if (!b) | |
292 | return; | |
293 | if (*pbuflen < (i = (size_t)BN_num_bytes(b))) | |
294 | *pbuflen = i; | |
295 | } | |
296 | ||
3e4585c8 DSH |
297 | static int dh_param_decode(EVP_PKEY *pkey, |
298 | const unsigned char **pder, int derlen) | |
299 | { | |
300 | DH *dh; | |
301 | if (!(dh = d2i_DHparams(NULL, pder, derlen))) | |
302 | { | |
303 | DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB); | |
304 | return 0; | |
305 | } | |
306 | EVP_PKEY_assign_DH(pkey, dh); | |
307 | return 1; | |
308 | } | |
309 | ||
310 | static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder) | |
311 | { | |
312 | return i2d_DHparams(pkey->pkey.dh, pder); | |
313 | } | |
314 | ||
ceb46789 DSH |
315 | static int do_dh_print(BIO *bp, const DH *x, int indent, |
316 | ASN1_PCTX *ctx, int ptype) | |
3e4585c8 DSH |
317 | { |
318 | unsigned char *m=NULL; | |
319 | int reason=ERR_R_BUF_LIB,ret=0; | |
ceb46789 DSH |
320 | size_t buf_len=0; |
321 | ||
322 | const char *ktype = NULL; | |
323 | ||
324 | BIGNUM *priv_key, *pub_key; | |
3e4585c8 | 325 | |
ceb46789 DSH |
326 | if (ptype == 2) |
327 | priv_key = x->priv_key; | |
3e4585c8 | 328 | else |
ceb46789 DSH |
329 | priv_key = NULL; |
330 | ||
331 | if (ptype > 0) | |
332 | pub_key = x->pub_key; | |
333 | else | |
334 | pub_key = NULL; | |
335 | ||
336 | update_buflen(x->p, &buf_len); | |
337 | ||
338 | if (buf_len == 0) | |
3e4585c8 DSH |
339 | { |
340 | reason = ERR_R_PASSED_NULL_PARAMETER; | |
341 | goto err; | |
342 | } | |
ceb46789 DSH |
343 | |
344 | update_buflen(x->g, &buf_len); | |
345 | update_buflen(pub_key, &buf_len); | |
346 | update_buflen(priv_key, &buf_len); | |
347 | ||
348 | if (ptype == 2) | |
349 | ktype = "PKCS#3 DH Private-Key"; | |
350 | else if (ptype == 1) | |
351 | ktype = "PKCS#3 DH Public-Key"; | |
352 | else | |
353 | ktype = "PKCS#3 DH Parameters"; | |
354 | ||
355 | m= OPENSSL_malloc(buf_len+10); | |
3e4585c8 DSH |
356 | if (m == NULL) |
357 | { | |
358 | reason=ERR_R_MALLOC_FAILURE; | |
359 | goto err; | |
360 | } | |
361 | ||
362 | BIO_indent(bp, indent, 128); | |
ceb46789 | 363 | if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0) |
3e4585c8 DSH |
364 | goto err; |
365 | indent += 4; | |
ceb46789 DSH |
366 | |
367 | if (!ASN1_bn_print(bp,"private-key:",priv_key,m,indent)) goto err; | |
368 | if (!ASN1_bn_print(bp,"public-key:",pub_key,m,indent)) goto err; | |
369 | ||
3e4585c8 DSH |
370 | if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err; |
371 | if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err; | |
372 | if (x->length != 0) | |
373 | { | |
374 | BIO_indent(bp, indent, 128); | |
375 | if (BIO_printf(bp,"recommended-private-length: %d bits\n", | |
376 | (int)x->length) <= 0) goto err; | |
377 | } | |
ceb46789 DSH |
378 | |
379 | ||
3e4585c8 DSH |
380 | ret=1; |
381 | if (0) | |
382 | { | |
383 | err: | |
384 | DHerr(DH_F_DHPARAMS_PRINT,reason); | |
385 | } | |
386 | if (m != NULL) OPENSSL_free(m); | |
387 | return(ret); | |
388 | } | |
389 | ||
ceb46789 DSH |
390 | static int int_dh_size(const EVP_PKEY *pkey) |
391 | { | |
392 | return(DH_size(pkey->pkey.dh)); | |
393 | } | |
394 | ||
395 | static int dh_bits(const EVP_PKEY *pkey) | |
396 | { | |
397 | return BN_num_bits(pkey->pkey.dh->p); | |
398 | } | |
399 | ||
400 | static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) | |
401 | { | |
402 | BIGNUM *a; | |
403 | ||
404 | if ((a=BN_dup(from->pkey.dh->p)) == NULL) | |
405 | return 0; | |
3ba0885a | 406 | if (to->pkey.dh->p != NULL) |
ceb46789 | 407 | BN_free(to->pkey.dh->p); |
3ba0885a | 408 | to->pkey.dh->p=a; |
ceb46789 DSH |
409 | |
410 | if ((a=BN_dup(from->pkey.dh->g)) == NULL) | |
411 | return 0; | |
412 | if (to->pkey.dsa->g != NULL) | |
413 | BN_free(to->pkey.dh->g); | |
414 | to->pkey.dh->g=a; | |
415 | ||
416 | return 1; | |
417 | } | |
418 | ||
419 | static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) | |
420 | { | |
421 | if ( BN_cmp(a->pkey.dh->p,b->pkey.dsa->p) || | |
422 | BN_cmp(a->pkey.dh->g,b->pkey.dsa->g)) | |
423 | return 0; | |
424 | else | |
425 | return 1; | |
426 | } | |
427 | ||
428 | static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) | |
429 | { | |
430 | if (dh_cmp_parameters(a, b) == 0) | |
431 | return 0; | |
432 | if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->pub_key) != 0) | |
433 | return 0; | |
434 | else | |
435 | return 1; | |
436 | } | |
437 | ||
3e4585c8 DSH |
438 | static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
439 | ASN1_PCTX *ctx) | |
440 | { | |
ceb46789 DSH |
441 | return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0); |
442 | } | |
443 | ||
444 | static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
445 | ASN1_PCTX *ctx) | |
446 | { | |
447 | return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1); | |
448 | } | |
449 | ||
450 | static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
451 | ASN1_PCTX *ctx) | |
452 | { | |
453 | return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2); | |
3e4585c8 DSH |
454 | } |
455 | ||
456 | int DHparams_print(BIO *bp, const DH *x) | |
457 | { | |
ceb46789 | 458 | return do_dh_print(bp, x, 4, NULL, 0); |
3e4585c8 DSH |
459 | } |
460 | ||
adbc603d DSH |
461 | const EVP_PKEY_ASN1_METHOD dh_asn1_meth = |
462 | { | |
463 | EVP_PKEY_DH, | |
464 | EVP_PKEY_DH, | |
465 | 0, | |
466 | ||
0b33dac3 | 467 | "DH", |
d82e2718 DSH |
468 | "OpenSSL PKCS#3 DH method", |
469 | ||
ceb46789 DSH |
470 | dh_pub_decode, |
471 | dh_pub_encode, | |
472 | dh_pub_cmp, | |
473 | dh_public_print, | |
adbc603d | 474 | |
4c97a04e DSH |
475 | dh_priv_decode, |
476 | dh_priv_encode, | |
ceb46789 | 477 | dh_private_print, |
adbc603d | 478 | |
ceb46789 DSH |
479 | int_dh_size, |
480 | dh_bits, | |
adbc603d | 481 | |
3e4585c8 DSH |
482 | dh_param_decode, |
483 | dh_param_encode, | |
ceb46789 DSH |
484 | 0, |
485 | dh_copy_parameters, | |
486 | dh_cmp_parameters, | |
3e4585c8 | 487 | dh_param_print, |
adbc603d DSH |
488 | |
489 | int_dh_free, | |
490 | 0 | |
491 | }; | |
492 |