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Commit | Line | Data |
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0f113f3e | 1 | /* |
aa6bb135 | 2 | * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved. |
adbc603d | 3 | * |
aa6bb135 RS |
4 | * Licensed under the OpenSSL license (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 | |
adbc603d DSH |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
b39fc560 | 11 | #include "internal/cryptlib.h" |
adbc603d DSH |
12 | #include <openssl/x509.h> |
13 | #include <openssl/asn1.h> | |
0aeddcfa | 14 | #include "dh_locl.h" |
1e26a8ba | 15 | #include <openssl/bn.h> |
5fe736e5 | 16 | #include "internal/asn1_int.h" |
3aeb9348 | 17 | #include "internal/evp_int.h" |
3c27208f | 18 | #include <openssl/cms.h> |
adbc603d | 19 | |
0f113f3e MC |
20 | /* |
21 | * i2d/d2i like DH parameter functions which use the appropriate routine for | |
22 | * PKCS#3 DH or X9.42 DH. | |
afb14cda DSH |
23 | */ |
24 | ||
0f113f3e MC |
25 | static DH *d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp, |
26 | long length) | |
27 | { | |
28 | if (pkey->ameth == &dhx_asn1_meth) | |
29 | return d2i_DHxparams(NULL, pp, length); | |
30 | return d2i_DHparams(NULL, pp, length); | |
31 | } | |
afb14cda DSH |
32 | |
33 | static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp) | |
0f113f3e MC |
34 | { |
35 | if (pkey->ameth == &dhx_asn1_meth) | |
36 | return i2d_DHxparams(a, pp); | |
37 | return i2d_DHparams(a, pp); | |
38 | } | |
afb14cda | 39 | |
adbc603d | 40 | static void int_dh_free(EVP_PKEY *pkey) |
0f113f3e MC |
41 | { |
42 | DH_free(pkey->pkey.dh); | |
43 | } | |
adbc603d | 44 | |
ceb46789 | 45 | static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) |
0f113f3e MC |
46 | { |
47 | const unsigned char *p, *pm; | |
48 | int pklen, pmlen; | |
49 | int ptype; | |
50 | void *pval; | |
51 | ASN1_STRING *pstr; | |
52 | X509_ALGOR *palg; | |
53 | ASN1_INTEGER *public_key = NULL; | |
54 | ||
55 | DH *dh = NULL; | |
56 | ||
57 | if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) | |
58 | return 0; | |
59 | X509_ALGOR_get0(NULL, &ptype, &pval, palg); | |
60 | ||
61 | if (ptype != V_ASN1_SEQUENCE) { | |
62 | DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR); | |
63 | goto err; | |
64 | } | |
65 | ||
66 | pstr = pval; | |
67 | pm = pstr->data; | |
68 | pmlen = pstr->length; | |
69 | ||
75ebbd9a | 70 | if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) { |
0f113f3e MC |
71 | DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); |
72 | goto err; | |
73 | } | |
74 | ||
75ebbd9a | 75 | if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) { |
0f113f3e MC |
76 | DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); |
77 | goto err; | |
78 | } | |
79 | ||
80 | /* We have parameters now set public key */ | |
75ebbd9a | 81 | if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) { |
0f113f3e MC |
82 | DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR); |
83 | goto err; | |
84 | } | |
85 | ||
86 | ASN1_INTEGER_free(public_key); | |
87 | EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh); | |
88 | return 1; | |
89 | ||
90 | err: | |
2ace7450 | 91 | ASN1_INTEGER_free(public_key); |
d6407083 | 92 | DH_free(dh); |
0f113f3e | 93 | return 0; |
4c97a04e | 94 | |
0f113f3e | 95 | } |
4c97a04e | 96 | |
0f113f3e MC |
97 | static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) |
98 | { | |
99 | DH *dh; | |
0f113f3e MC |
100 | int ptype; |
101 | unsigned char *penc = NULL; | |
102 | int penclen; | |
103 | ASN1_STRING *str; | |
104 | ASN1_INTEGER *pub_key = NULL; | |
105 | ||
106 | dh = pkey->pkey.dh; | |
107 | ||
108 | str = ASN1_STRING_new(); | |
90945fa3 | 109 | if (str == NULL) { |
6aa8dab2 MC |
110 | DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); |
111 | goto err; | |
112 | } | |
0f113f3e MC |
113 | str->length = i2d_dhp(pkey, dh, &str->data); |
114 | if (str->length <= 0) { | |
115 | DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); | |
116 | goto err; | |
117 | } | |
0f113f3e MC |
118 | ptype = V_ASN1_SEQUENCE; |
119 | ||
120 | pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL); | |
121 | if (!pub_key) | |
122 | goto err; | |
123 | ||
124 | penclen = i2d_ASN1_INTEGER(pub_key, &penc); | |
125 | ||
126 | ASN1_INTEGER_free(pub_key); | |
127 | ||
128 | if (penclen <= 0) { | |
129 | DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); | |
130 | goto err; | |
131 | } | |
132 | ||
133 | if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id), | |
6aa8dab2 | 134 | ptype, str, penc, penclen)) |
0f113f3e MC |
135 | return 1; |
136 | ||
137 | err: | |
b548a1f1 | 138 | OPENSSL_free(penc); |
0dfb9398 | 139 | ASN1_STRING_free(str); |
0f113f3e MC |
140 | |
141 | return 0; | |
142 | } | |
4c97a04e | 143 | |
0f113f3e MC |
144 | /* |
145 | * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that | |
146 | * the AlgorithmIdentifier contains the parameters, the private key is | |
0d4fb843 | 147 | * explicitly included and the pubkey must be recalculated. |
0f113f3e | 148 | */ |
4c97a04e | 149 | |
0f113f3e MC |
150 | static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) |
151 | { | |
152 | const unsigned char *p, *pm; | |
153 | int pklen, pmlen; | |
154 | int ptype; | |
155 | void *pval; | |
156 | ASN1_STRING *pstr; | |
157 | X509_ALGOR *palg; | |
158 | ASN1_INTEGER *privkey = NULL; | |
159 | ||
160 | DH *dh = NULL; | |
161 | ||
162 | if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) | |
163 | return 0; | |
164 | ||
165 | X509_ALGOR_get0(NULL, &ptype, &pval, palg); | |
166 | ||
167 | if (ptype != V_ASN1_SEQUENCE) | |
168 | goto decerr; | |
75ebbd9a | 169 | if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) |
0f113f3e MC |
170 | goto decerr; |
171 | ||
172 | pstr = pval; | |
173 | pm = pstr->data; | |
174 | pmlen = pstr->length; | |
75ebbd9a | 175 | if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) |
0f113f3e | 176 | goto decerr; |
75ebbd9a | 177 | |
0f113f3e | 178 | /* We have parameters now set private key */ |
74924dcb RS |
179 | if ((dh->priv_key = BN_secure_new()) == NULL |
180 | || !ASN1_INTEGER_to_BN(privkey, dh->priv_key)) { | |
0f113f3e MC |
181 | DHerr(DH_F_DH_PRIV_DECODE, DH_R_BN_ERROR); |
182 | goto dherr; | |
183 | } | |
184 | /* Calculate public key */ | |
185 | if (!DH_generate_key(dh)) | |
186 | goto dherr; | |
187 | ||
188 | EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh); | |
189 | ||
a8ae0891 | 190 | ASN1_STRING_clear_free(privkey); |
0f113f3e MC |
191 | |
192 | return 1; | |
193 | ||
194 | decerr: | |
195 | DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR); | |
196 | dherr: | |
197 | DH_free(dh); | |
a8ae0891 | 198 | ASN1_STRING_clear_free(privkey); |
0f113f3e MC |
199 | return 0; |
200 | } | |
4c97a04e DSH |
201 | |
202 | static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) | |
203 | { | |
0f113f3e MC |
204 | ASN1_STRING *params = NULL; |
205 | ASN1_INTEGER *prkey = NULL; | |
206 | unsigned char *dp = NULL; | |
207 | int dplen; | |
208 | ||
209 | params = ASN1_STRING_new(); | |
210 | ||
90945fa3 | 211 | if (params == NULL) { |
0f113f3e MC |
212 | DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); |
213 | goto err; | |
214 | } | |
215 | ||
216 | params->length = i2d_dhp(pkey, pkey->pkey.dh, ¶ms->data); | |
217 | if (params->length <= 0) { | |
218 | DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); | |
219 | goto err; | |
220 | } | |
221 | params->type = V_ASN1_SEQUENCE; | |
222 | ||
223 | /* Get private key into integer */ | |
224 | prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL); | |
225 | ||
226 | if (!prkey) { | |
227 | DHerr(DH_F_DH_PRIV_ENCODE, DH_R_BN_ERROR); | |
228 | goto err; | |
229 | } | |
230 | ||
231 | dplen = i2d_ASN1_INTEGER(prkey, &dp); | |
232 | ||
a8ae0891 | 233 | ASN1_STRING_clear_free(prkey); |
1549a265 | 234 | prkey = NULL; |
0f113f3e MC |
235 | |
236 | if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0, | |
237 | V_ASN1_SEQUENCE, params, dp, dplen)) | |
238 | goto err; | |
239 | ||
240 | return 1; | |
241 | ||
242 | err: | |
b548a1f1 | 243 | OPENSSL_free(dp); |
0dfb9398 | 244 | ASN1_STRING_free(params); |
2ace7450 | 245 | ASN1_STRING_clear_free(prkey); |
0f113f3e | 246 | return 0; |
4c97a04e DSH |
247 | } |
248 | ||
3e4585c8 | 249 | static int dh_param_decode(EVP_PKEY *pkey, |
0f113f3e MC |
250 | const unsigned char **pder, int derlen) |
251 | { | |
252 | DH *dh; | |
75ebbd9a RS |
253 | |
254 | if ((dh = d2i_dhp(pkey, pder, derlen)) == NULL) { | |
0f113f3e MC |
255 | DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB); |
256 | return 0; | |
257 | } | |
258 | EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh); | |
259 | return 1; | |
260 | } | |
3e4585c8 DSH |
261 | |
262 | static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder) | |
0f113f3e MC |
263 | { |
264 | return i2d_dhp(pkey, pkey->pkey.dh, pder); | |
265 | } | |
3e4585c8 | 266 | |
a773b52a | 267 | static int do_dh_print(BIO *bp, const DH *x, int indent, int ptype) |
0f113f3e | 268 | { |
66696478 | 269 | int reason = ERR_R_BUF_LIB; |
0f113f3e | 270 | const char *ktype = NULL; |
0f113f3e MC |
271 | BIGNUM *priv_key, *pub_key; |
272 | ||
273 | if (ptype == 2) | |
274 | priv_key = x->priv_key; | |
275 | else | |
276 | priv_key = NULL; | |
277 | ||
278 | if (ptype > 0) | |
279 | pub_key = x->pub_key; | |
280 | else | |
281 | pub_key = NULL; | |
282 | ||
a773b52a | 283 | if (priv_key == NULL && pub_key == NULL) { |
0f113f3e MC |
284 | reason = ERR_R_PASSED_NULL_PARAMETER; |
285 | goto err; | |
286 | } | |
287 | ||
0f113f3e MC |
288 | if (ptype == 2) |
289 | ktype = "DH Private-Key"; | |
290 | else if (ptype == 1) | |
291 | ktype = "DH Public-Key"; | |
292 | else | |
293 | ktype = "DH Parameters"; | |
294 | ||
0f113f3e MC |
295 | BIO_indent(bp, indent, 128); |
296 | if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0) | |
297 | goto err; | |
298 | indent += 4; | |
299 | ||
a773b52a | 300 | if (!ASN1_bn_print(bp, "private-key:", priv_key, NULL, indent)) |
0f113f3e | 301 | goto err; |
a773b52a | 302 | if (!ASN1_bn_print(bp, "public-key:", pub_key, NULL, indent)) |
0f113f3e MC |
303 | goto err; |
304 | ||
a773b52a | 305 | if (!ASN1_bn_print(bp, "prime:", x->p, NULL, indent)) |
0f113f3e | 306 | goto err; |
a773b52a | 307 | if (!ASN1_bn_print(bp, "generator:", x->g, NULL, indent)) |
0f113f3e | 308 | goto err; |
a773b52a | 309 | if (x->q && !ASN1_bn_print(bp, "subgroup order:", x->q, NULL, indent)) |
0f113f3e | 310 | goto err; |
a773b52a | 311 | if (x->j && !ASN1_bn_print(bp, "subgroup factor:", x->j, NULL, indent)) |
0f113f3e MC |
312 | goto err; |
313 | if (x->seed) { | |
314 | int i; | |
315 | BIO_indent(bp, indent, 128); | |
316 | BIO_puts(bp, "seed:"); | |
317 | for (i = 0; i < x->seedlen; i++) { | |
318 | if ((i % 15) == 0) { | |
319 | if (BIO_puts(bp, "\n") <= 0 | |
320 | || !BIO_indent(bp, indent + 4, 128)) | |
321 | goto err; | |
322 | } | |
323 | if (BIO_printf(bp, "%02x%s", x->seed[i], | |
324 | ((i + 1) == x->seedlen) ? "" : ":") <= 0) | |
325 | goto err; | |
326 | } | |
327 | if (BIO_write(bp, "\n", 1) <= 0) | |
328 | return (0); | |
329 | } | |
a773b52a | 330 | if (x->counter && !ASN1_bn_print(bp, "counter:", x->counter, NULL, indent)) |
0f113f3e MC |
331 | goto err; |
332 | if (x->length != 0) { | |
333 | BIO_indent(bp, indent, 128); | |
334 | if (BIO_printf(bp, "recommended-private-length: %d bits\n", | |
335 | (int)x->length) <= 0) | |
336 | goto err; | |
337 | } | |
338 | ||
66696478 RS |
339 | return 1; |
340 | ||
0f113f3e | 341 | err: |
66696478 | 342 | DHerr(DH_F_DO_DH_PRINT, reason); |
66696478 | 343 | return 0; |
0f113f3e | 344 | } |
3e4585c8 | 345 | |
ceb46789 | 346 | static int int_dh_size(const EVP_PKEY *pkey) |
0f113f3e MC |
347 | { |
348 | return (DH_size(pkey->pkey.dh)); | |
349 | } | |
ceb46789 DSH |
350 | |
351 | static int dh_bits(const EVP_PKEY *pkey) | |
0f113f3e MC |
352 | { |
353 | return BN_num_bits(pkey->pkey.dh->p); | |
354 | } | |
ceb46789 | 355 | |
2514fa79 | 356 | static int dh_security_bits(const EVP_PKEY *pkey) |
0f113f3e MC |
357 | { |
358 | return DH_security_bits(pkey->pkey.dh); | |
359 | } | |
2514fa79 | 360 | |
ffb1ac67 | 361 | static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) |
0f113f3e MC |
362 | { |
363 | if (BN_cmp(a->pkey.dh->p, b->pkey.dh->p) || | |
364 | BN_cmp(a->pkey.dh->g, b->pkey.dh->g)) | |
365 | return 0; | |
366 | else if (a->ameth == &dhx_asn1_meth) { | |
367 | if (BN_cmp(a->pkey.dh->q, b->pkey.dh->q)) | |
368 | return 0; | |
369 | } | |
370 | return 1; | |
371 | } | |
ffb1ac67 | 372 | |
d3cc91ee | 373 | static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src) |
0f113f3e MC |
374 | { |
375 | BIGNUM *a; | |
376 | if (src) { | |
377 | a = BN_dup(src); | |
378 | if (!a) | |
379 | return 0; | |
380 | } else | |
381 | a = NULL; | |
23a1d5e9 | 382 | BN_free(*dst); |
0f113f3e MC |
383 | *dst = a; |
384 | return 1; | |
385 | } | |
ceb46789 | 386 | |
d3cc91ee | 387 | static int int_dh_param_copy(DH *to, const DH *from, int is_x942) |
0f113f3e MC |
388 | { |
389 | if (is_x942 == -1) | |
390 | is_x942 = ! !from->q; | |
391 | if (!int_dh_bn_cpy(&to->p, from->p)) | |
392 | return 0; | |
393 | if (!int_dh_bn_cpy(&to->g, from->g)) | |
394 | return 0; | |
395 | if (is_x942) { | |
396 | if (!int_dh_bn_cpy(&to->q, from->q)) | |
397 | return 0; | |
398 | if (!int_dh_bn_cpy(&to->j, from->j)) | |
399 | return 0; | |
b548a1f1 RS |
400 | OPENSSL_free(to->seed); |
401 | to->seed = NULL; | |
402 | to->seedlen = 0; | |
0f113f3e | 403 | if (from->seed) { |
7644a9ae | 404 | to->seed = OPENSSL_memdup(from->seed, from->seedlen); |
0f113f3e MC |
405 | if (!to->seed) |
406 | return 0; | |
407 | to->seedlen = from->seedlen; | |
408 | } | |
409 | } else | |
410 | to->length = from->length; | |
411 | return 1; | |
412 | } | |
d3cc91ee DSH |
413 | |
414 | DH *DHparams_dup(DH *dh) | |
0f113f3e MC |
415 | { |
416 | DH *ret; | |
417 | ret = DH_new(); | |
90945fa3 | 418 | if (ret == NULL) |
0f113f3e MC |
419 | return NULL; |
420 | if (!int_dh_param_copy(ret, dh, -1)) { | |
421 | DH_free(ret); | |
422 | return NULL; | |
423 | } | |
424 | return ret; | |
425 | } | |
d3cc91ee DSH |
426 | |
427 | static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) | |
0f113f3e | 428 | { |
2986ecdc DSH |
429 | if (to->pkey.dh == NULL) { |
430 | to->pkey.dh = DH_new(); | |
431 | if (to->pkey.dh == NULL) | |
432 | return 0; | |
433 | } | |
0f113f3e MC |
434 | return int_dh_param_copy(to->pkey.dh, from->pkey.dh, |
435 | from->ameth == &dhx_asn1_meth); | |
436 | } | |
d3cc91ee | 437 | |
ffb1ac67 | 438 | static int dh_missing_parameters(const EVP_PKEY *a) |
0f113f3e MC |
439 | { |
440 | if (!a->pkey.dh->p || !a->pkey.dh->g) | |
441 | return 1; | |
442 | return 0; | |
443 | } | |
ceb46789 DSH |
444 | |
445 | static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) | |
0f113f3e MC |
446 | { |
447 | if (dh_cmp_parameters(a, b) == 0) | |
448 | return 0; | |
449 | if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0) | |
450 | return 0; | |
451 | else | |
452 | return 1; | |
453 | } | |
ceb46789 | 454 | |
3e4585c8 | 455 | static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
0f113f3e MC |
456 | ASN1_PCTX *ctx) |
457 | { | |
a773b52a | 458 | return do_dh_print(bp, pkey->pkey.dh, indent, 0); |
0f113f3e | 459 | } |
ceb46789 DSH |
460 | |
461 | static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
0f113f3e MC |
462 | ASN1_PCTX *ctx) |
463 | { | |
a773b52a | 464 | return do_dh_print(bp, pkey->pkey.dh, indent, 1); |
0f113f3e | 465 | } |
ceb46789 DSH |
466 | |
467 | static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent, | |
0f113f3e MC |
468 | ASN1_PCTX *ctx) |
469 | { | |
a773b52a | 470 | return do_dh_print(bp, pkey->pkey.dh, indent, 2); |
0f113f3e | 471 | } |
3e4585c8 DSH |
472 | |
473 | int DHparams_print(BIO *bp, const DH *x) | |
0f113f3e | 474 | { |
a773b52a | 475 | return do_dh_print(bp, x, 4, 0); |
0f113f3e | 476 | } |
3e4585c8 | 477 | |
bd59f2b9 DSH |
478 | #ifndef OPENSSL_NO_CMS |
479 | static int dh_cms_decrypt(CMS_RecipientInfo *ri); | |
480 | static int dh_cms_encrypt(CMS_RecipientInfo *ri); | |
481 | #endif | |
482 | ||
483 | static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) | |
0f113f3e MC |
484 | { |
485 | switch (op) { | |
bd59f2b9 DSH |
486 | #ifndef OPENSSL_NO_CMS |
487 | ||
0f113f3e MC |
488 | case ASN1_PKEY_CTRL_CMS_ENVELOPE: |
489 | if (arg1 == 1) | |
490 | return dh_cms_decrypt(arg2); | |
491 | else if (arg1 == 0) | |
492 | return dh_cms_encrypt(arg2); | |
493 | return -2; | |
bd59f2b9 | 494 | |
0f113f3e MC |
495 | case ASN1_PKEY_CTRL_CMS_RI_TYPE: |
496 | *(int *)arg2 = CMS_RECIPINFO_AGREE; | |
497 | return 1; | |
bd59f2b9 | 498 | #endif |
0f113f3e MC |
499 | default: |
500 | return -2; | |
501 | } | |
502 | ||
503 | } | |
504 | ||
505 | const EVP_PKEY_ASN1_METHOD dh_asn1_meth = { | |
506 | EVP_PKEY_DH, | |
507 | EVP_PKEY_DH, | |
508 | 0, | |
509 | ||
510 | "DH", | |
511 | "OpenSSL PKCS#3 DH method", | |
512 | ||
513 | dh_pub_decode, | |
514 | dh_pub_encode, | |
515 | dh_pub_cmp, | |
516 | dh_public_print, | |
517 | ||
518 | dh_priv_decode, | |
519 | dh_priv_encode, | |
520 | dh_private_print, | |
521 | ||
522 | int_dh_size, | |
523 | dh_bits, | |
524 | dh_security_bits, | |
525 | ||
526 | dh_param_decode, | |
527 | dh_param_encode, | |
528 | dh_missing_parameters, | |
529 | dh_copy_parameters, | |
530 | dh_cmp_parameters, | |
531 | dh_param_print, | |
532 | 0, | |
533 | ||
534 | int_dh_free, | |
535 | 0 | |
536 | }; | |
537 | ||
538 | const EVP_PKEY_ASN1_METHOD dhx_asn1_meth = { | |
539 | EVP_PKEY_DHX, | |
540 | EVP_PKEY_DHX, | |
541 | 0, | |
542 | ||
543 | "X9.42 DH", | |
544 | "OpenSSL X9.42 DH method", | |
545 | ||
546 | dh_pub_decode, | |
547 | dh_pub_encode, | |
548 | dh_pub_cmp, | |
549 | dh_public_print, | |
550 | ||
551 | dh_priv_decode, | |
552 | dh_priv_encode, | |
553 | dh_private_print, | |
554 | ||
555 | int_dh_size, | |
556 | dh_bits, | |
557 | dh_security_bits, | |
558 | ||
559 | dh_param_decode, | |
560 | dh_param_encode, | |
561 | dh_missing_parameters, | |
562 | dh_copy_parameters, | |
563 | dh_cmp_parameters, | |
564 | dh_param_print, | |
565 | 0, | |
566 | ||
567 | int_dh_free, | |
568 | dh_pkey_ctrl | |
569 | }; | |
570 | ||
bd59f2b9 DSH |
571 | #ifndef OPENSSL_NO_CMS |
572 | ||
573 | static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx, | |
0f113f3e MC |
574 | X509_ALGOR *alg, ASN1_BIT_STRING *pubkey) |
575 | { | |
576 | ASN1_OBJECT *aoid; | |
577 | int atype; | |
578 | void *aval; | |
579 | ASN1_INTEGER *public_key = NULL; | |
580 | int rv = 0; | |
581 | EVP_PKEY *pkpeer = NULL, *pk = NULL; | |
582 | DH *dhpeer = NULL; | |
583 | const unsigned char *p; | |
584 | int plen; | |
585 | ||
586 | X509_ALGOR_get0(&aoid, &atype, &aval, alg); | |
587 | if (OBJ_obj2nid(aoid) != NID_dhpublicnumber) | |
588 | goto err; | |
589 | /* Only absent parameters allowed in RFC XXXX */ | |
590 | if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL) | |
591 | goto err; | |
592 | ||
593 | pk = EVP_PKEY_CTX_get0_pkey(pctx); | |
594 | if (!pk) | |
595 | goto err; | |
596 | if (pk->type != EVP_PKEY_DHX) | |
597 | goto err; | |
598 | /* Get parameters from parent key */ | |
599 | dhpeer = DHparams_dup(pk->pkey.dh); | |
600 | /* We have parameters now set public key */ | |
601 | plen = ASN1_STRING_length(pubkey); | |
602 | p = ASN1_STRING_data(pubkey); | |
603 | if (!p || !plen) | |
604 | goto err; | |
605 | ||
75ebbd9a | 606 | if ((public_key = d2i_ASN1_INTEGER(NULL, &p, plen)) == NULL) { |
0f113f3e MC |
607 | DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_DECODE_ERROR); |
608 | goto err; | |
609 | } | |
610 | ||
611 | /* We have parameters now set public key */ | |
75ebbd9a | 612 | if ((dhpeer->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) { |
0f113f3e MC |
613 | DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_BN_DECODE_ERROR); |
614 | goto err; | |
615 | } | |
616 | ||
617 | pkpeer = EVP_PKEY_new(); | |
90945fa3 | 618 | if (pkpeer == NULL) |
0f113f3e MC |
619 | goto err; |
620 | EVP_PKEY_assign(pkpeer, pk->ameth->pkey_id, dhpeer); | |
621 | dhpeer = NULL; | |
622 | if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0) | |
623 | rv = 1; | |
624 | err: | |
2ace7450 | 625 | ASN1_INTEGER_free(public_key); |
c5ba2d99 | 626 | EVP_PKEY_free(pkpeer); |
d6407083 | 627 | DH_free(dhpeer); |
0f113f3e MC |
628 | return rv; |
629 | } | |
bd59f2b9 DSH |
630 | |
631 | static int dh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri) | |
0f113f3e MC |
632 | { |
633 | int rv = 0; | |
634 | ||
635 | X509_ALGOR *alg, *kekalg = NULL; | |
636 | ASN1_OCTET_STRING *ukm; | |
637 | const unsigned char *p; | |
638 | unsigned char *dukm = NULL; | |
639 | size_t dukmlen = 0; | |
640 | int keylen, plen; | |
641 | const EVP_CIPHER *kekcipher; | |
642 | EVP_CIPHER_CTX *kekctx; | |
643 | ||
644 | if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm)) | |
645 | goto err; | |
646 | ||
647 | /* | |
648 | * For DH we only have one OID permissible. If ever any more get defined | |
649 | * we will need something cleverer. | |
650 | */ | |
651 | if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH) { | |
652 | DHerr(DH_F_DH_CMS_SET_SHARED_INFO, DH_R_KDF_PARAMETER_ERROR); | |
653 | goto err; | |
654 | } | |
655 | ||
656 | if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0) | |
657 | goto err; | |
658 | ||
659 | if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0) | |
660 | goto err; | |
661 | ||
662 | if (alg->parameter->type != V_ASN1_SEQUENCE) | |
663 | goto err; | |
664 | ||
665 | p = alg->parameter->value.sequence->data; | |
666 | plen = alg->parameter->value.sequence->length; | |
667 | kekalg = d2i_X509_ALGOR(NULL, &p, plen); | |
668 | if (!kekalg) | |
669 | goto err; | |
670 | kekctx = CMS_RecipientInfo_kari_get0_ctx(ri); | |
671 | if (!kekctx) | |
672 | goto err; | |
673 | kekcipher = EVP_get_cipherbyobj(kekalg->algorithm); | |
674 | if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE) | |
675 | goto err; | |
676 | if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL)) | |
677 | goto err; | |
678 | if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0) | |
679 | goto err; | |
680 | ||
681 | keylen = EVP_CIPHER_CTX_key_length(kekctx); | |
682 | if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0) | |
683 | goto err; | |
684 | /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */ | |
685 | if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, | |
686 | OBJ_nid2obj(EVP_CIPHER_type(kekcipher))) | |
687 | <= 0) | |
688 | goto err; | |
689 | ||
690 | if (ukm) { | |
691 | dukmlen = ASN1_STRING_length(ukm); | |
7644a9ae | 692 | dukm = OPENSSL_memdup(ASN1_STRING_data(ukm), dukmlen); |
0f113f3e MC |
693 | if (!dukm) |
694 | goto err; | |
695 | } | |
696 | ||
697 | if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0) | |
698 | goto err; | |
699 | dukm = NULL; | |
700 | ||
701 | rv = 1; | |
702 | err: | |
222561fe RS |
703 | X509_ALGOR_free(kekalg); |
704 | OPENSSL_free(dukm); | |
0f113f3e MC |
705 | return rv; |
706 | } | |
bd59f2b9 DSH |
707 | |
708 | static int dh_cms_decrypt(CMS_RecipientInfo *ri) | |
0f113f3e MC |
709 | { |
710 | EVP_PKEY_CTX *pctx; | |
711 | pctx = CMS_RecipientInfo_get0_pkey_ctx(ri); | |
712 | if (!pctx) | |
713 | return 0; | |
714 | /* See if we need to set peer key */ | |
715 | if (!EVP_PKEY_CTX_get0_peerkey(pctx)) { | |
716 | X509_ALGOR *alg; | |
717 | ASN1_BIT_STRING *pubkey; | |
718 | if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey, | |
719 | NULL, NULL, NULL)) | |
720 | return 0; | |
721 | if (!alg || !pubkey) | |
722 | return 0; | |
723 | if (!dh_cms_set_peerkey(pctx, alg, pubkey)) { | |
724 | DHerr(DH_F_DH_CMS_DECRYPT, DH_R_PEER_KEY_ERROR); | |
725 | return 0; | |
726 | } | |
727 | } | |
728 | /* Set DH derivation parameters and initialise unwrap context */ | |
729 | if (!dh_cms_set_shared_info(pctx, ri)) { | |
730 | DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR); | |
731 | return 0; | |
732 | } | |
733 | return 1; | |
734 | } | |
bd59f2b9 DSH |
735 | |
736 | static int dh_cms_encrypt(CMS_RecipientInfo *ri) | |
0f113f3e MC |
737 | { |
738 | EVP_PKEY_CTX *pctx; | |
739 | EVP_PKEY *pkey; | |
740 | EVP_CIPHER_CTX *ctx; | |
741 | int keylen; | |
742 | X509_ALGOR *talg, *wrap_alg = NULL; | |
743 | ASN1_OBJECT *aoid; | |
744 | ASN1_BIT_STRING *pubkey; | |
745 | ASN1_STRING *wrap_str; | |
746 | ASN1_OCTET_STRING *ukm; | |
747 | unsigned char *penc = NULL, *dukm = NULL; | |
748 | int penclen; | |
749 | size_t dukmlen = 0; | |
750 | int rv = 0; | |
751 | int kdf_type, wrap_nid; | |
752 | const EVP_MD *kdf_md; | |
753 | pctx = CMS_RecipientInfo_get0_pkey_ctx(ri); | |
754 | if (!pctx) | |
755 | return 0; | |
756 | /* Get ephemeral key */ | |
757 | pkey = EVP_PKEY_CTX_get0_pkey(pctx); | |
758 | if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey, | |
759 | NULL, NULL, NULL)) | |
760 | goto err; | |
761 | X509_ALGOR_get0(&aoid, NULL, NULL, talg); | |
762 | /* Is everything uninitialised? */ | |
763 | if (aoid == OBJ_nid2obj(NID_undef)) { | |
c5ba2d99 | 764 | ASN1_INTEGER *pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL); |
0f113f3e MC |
765 | if (!pubk) |
766 | goto err; | |
767 | /* Set the key */ | |
768 | ||
769 | penclen = i2d_ASN1_INTEGER(pubk, &penc); | |
770 | ASN1_INTEGER_free(pubk); | |
771 | if (penclen <= 0) | |
772 | goto err; | |
773 | ASN1_STRING_set0(pubkey, penc, penclen); | |
774 | pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); | |
775 | pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT; | |
776 | ||
777 | penc = NULL; | |
778 | X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber), | |
779 | V_ASN1_UNDEF, NULL); | |
780 | } | |
781 | ||
0d4fb843 | 782 | /* See if custom parameters set */ |
0f113f3e MC |
783 | kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx); |
784 | if (kdf_type <= 0) | |
785 | goto err; | |
786 | if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md)) | |
787 | goto err; | |
788 | ||
789 | if (kdf_type == EVP_PKEY_DH_KDF_NONE) { | |
790 | kdf_type = EVP_PKEY_DH_KDF_X9_42; | |
791 | if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0) | |
792 | goto err; | |
793 | } else if (kdf_type != EVP_PKEY_DH_KDF_X9_42) | |
794 | /* Unknown KDF */ | |
795 | goto err; | |
796 | if (kdf_md == NULL) { | |
797 | /* Only SHA1 supported */ | |
798 | kdf_md = EVP_sha1(); | |
799 | if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0) | |
800 | goto err; | |
801 | } else if (EVP_MD_type(kdf_md) != NID_sha1) | |
802 | /* Unsupported digest */ | |
803 | goto err; | |
804 | ||
805 | if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm)) | |
806 | goto err; | |
807 | ||
808 | /* Get wrap NID */ | |
809 | ctx = CMS_RecipientInfo_kari_get0_ctx(ri); | |
810 | wrap_nid = EVP_CIPHER_CTX_type(ctx); | |
811 | if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0) | |
812 | goto err; | |
813 | keylen = EVP_CIPHER_CTX_key_length(ctx); | |
814 | ||
815 | /* Package wrap algorithm in an AlgorithmIdentifier */ | |
816 | ||
817 | wrap_alg = X509_ALGOR_new(); | |
90945fa3 | 818 | if (wrap_alg == NULL) |
0f113f3e MC |
819 | goto err; |
820 | wrap_alg->algorithm = OBJ_nid2obj(wrap_nid); | |
821 | wrap_alg->parameter = ASN1_TYPE_new(); | |
90945fa3 | 822 | if (wrap_alg->parameter == NULL) |
0f113f3e MC |
823 | goto err; |
824 | if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0) | |
825 | goto err; | |
826 | if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) { | |
827 | ASN1_TYPE_free(wrap_alg->parameter); | |
828 | wrap_alg->parameter = NULL; | |
829 | } | |
830 | ||
831 | if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0) | |
832 | goto err; | |
833 | ||
834 | if (ukm) { | |
835 | dukmlen = ASN1_STRING_length(ukm); | |
7644a9ae | 836 | dukm = OPENSSL_memdup(ASN1_STRING_data(ukm), dukmlen); |
0f113f3e MC |
837 | if (!dukm) |
838 | goto err; | |
839 | } | |
840 | ||
841 | if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0) | |
842 | goto err; | |
843 | dukm = NULL; | |
844 | ||
845 | /* | |
846 | * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter | |
847 | * of another AlgorithmIdentifier. | |
848 | */ | |
849 | penc = NULL; | |
850 | penclen = i2d_X509_ALGOR(wrap_alg, &penc); | |
851 | if (!penc || !penclen) | |
852 | goto err; | |
853 | wrap_str = ASN1_STRING_new(); | |
90945fa3 | 854 | if (wrap_str == NULL) |
0f113f3e MC |
855 | goto err; |
856 | ASN1_STRING_set0(wrap_str, penc, penclen); | |
857 | penc = NULL; | |
858 | X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH), | |
859 | V_ASN1_SEQUENCE, wrap_str); | |
860 | ||
861 | rv = 1; | |
862 | ||
863 | err: | |
222561fe RS |
864 | OPENSSL_free(penc); |
865 | X509_ALGOR_free(wrap_alg); | |
0f113f3e MC |
866 | return rv; |
867 | } | |
bd59f2b9 DSH |
868 | |
869 | #endif |