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
66static void int_dh_free(EVP_PKEY *pkey)
67	{
68	DH_free(pkey->pkey.dh);
69	}
70
71static 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
129static 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
184static 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
236static 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, &params->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
278err:
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
289static 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
298static 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
311static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
312	{
313	return i2d_DHparams(pkey->pkey.dh, pder);
314	}
315
316static 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		{
384err:
385		DHerr(DH_F_DO_DH_PRINT,reason);
386		}
387	if (m != NULL) OPENSSL_free(m);
388	return(ret);
389	}
390
391static int int_dh_size(const EVP_PKEY *pkey)
392	{
393	return(DH_size(pkey->pkey.dh));
394	}
395
396static int dh_bits(const EVP_PKEY *pkey)
397	{
398	return BN_num_bits(pkey->pkey.dh->p);
399	}
400
401static 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
410static 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
429static 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
436static 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
446static 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
452static 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
458static 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
464int DHparams_print(BIO *bp, const DH *x)
465	{
466	return do_dh_print(bp, x, 4, NULL, 0);
467	}
468
469const 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	};
501
502