2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
61 #include <openssl/x509.h>
62 #include <openssl/asn1.h>
63 #include <openssl/dh.h>
64 #include <openssl/bn.h>
65 #include "asn1_locl.h"
67 static void int_dh_free(EVP_PKEY *pkey)
69 DH_free(pkey->pkey.dh);
72 static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
74 const unsigned char *p, *pm;
80 ASN1_INTEGER *public_key = NULL;
84 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
86 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
88 if (ptype != V_ASN1_SEQUENCE) {
89 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
97 if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) {
98 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
102 if (!(public_key = d2i_ASN1_INTEGER(NULL, &p, pklen))) {
103 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
107 /* We have parameters now set public key */
108 if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) {
109 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
113 ASN1_INTEGER_free(public_key);
114 EVP_PKEY_assign_DH(pkey, dh);
119 ASN1_INTEGER_free(public_key);
126 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
131 unsigned char *penc = NULL;
134 ASN1_INTEGER *pub_key = NULL;
138 str = ASN1_STRING_new();
139 str->length = i2d_DHparams(dh, &str->data);
140 if (str->length <= 0) {
141 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
145 ptype = V_ASN1_SEQUENCE;
147 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
151 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
153 ASN1_INTEGER_free(pub_key);
156 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
160 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH),
161 ptype, pval, penc, penclen))
168 ASN1_STRING_free(pval);
174 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
175 * the AlgorithmIdentifier contains the paramaters, the private key is
176 * explcitly included and the pubkey must be recalculated.
179 static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
181 const unsigned char *p, *pm;
187 ASN1_INTEGER *privkey = NULL;
191 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
194 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
196 if (ptype != V_ASN1_SEQUENCE)
199 if (!(privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)))
204 pmlen = pstr->length;
205 if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
207 /* We have parameters now set private key */
208 if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) {
209 DHerr(DH_F_DH_PRIV_DECODE, DH_R_BN_ERROR);
212 /* Calculate public key */
213 if (!DH_generate_key(dh))
216 EVP_PKEY_assign_DH(pkey, dh);
218 ASN1_INTEGER_free(privkey);
223 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
226 ASN1_INTEGER_free(privkey);
230 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
232 ASN1_STRING *params = NULL;
233 ASN1_INTEGER *prkey = NULL;
234 unsigned char *dp = NULL;
237 params = ASN1_STRING_new();
240 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
244 params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data);
245 if (params->length <= 0) {
246 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
249 params->type = V_ASN1_SEQUENCE;
251 /* Get private key into integer */
252 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
255 DHerr(DH_F_DH_PRIV_ENCODE, DH_R_BN_ERROR);
259 dplen = i2d_ASN1_INTEGER(prkey, &dp);
261 ASN1_INTEGER_free(prkey);
264 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0,
265 V_ASN1_SEQUENCE, params, dp, dplen))
274 ASN1_STRING_free(params);
276 ASN1_INTEGER_free(prkey);
280 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
285 if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
289 static int dh_param_decode(EVP_PKEY *pkey,
290 const unsigned char **pder, int derlen)
293 if (!(dh = d2i_DHparams(NULL, pder, derlen))) {
294 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
297 EVP_PKEY_assign_DH(pkey, dh);
301 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
303 return i2d_DHparams(pkey->pkey.dh, pder);
306 static int do_dh_print(BIO *bp, const DH *x, int indent,
307 ASN1_PCTX *ctx, int ptype)
309 unsigned char *m = NULL;
310 int reason = ERR_R_BUF_LIB, ret = 0;
313 const char *ktype = NULL;
315 BIGNUM *priv_key, *pub_key;
318 priv_key = x->priv_key;
323 pub_key = x->pub_key;
327 update_buflen(x->p, &buf_len);
330 reason = ERR_R_PASSED_NULL_PARAMETER;
334 update_buflen(x->g, &buf_len);
335 update_buflen(pub_key, &buf_len);
336 update_buflen(priv_key, &buf_len);
339 ktype = "PKCS#3 DH Private-Key";
341 ktype = "PKCS#3 DH Public-Key";
343 ktype = "PKCS#3 DH Parameters";
345 m = OPENSSL_malloc(buf_len + 10);
347 reason = ERR_R_MALLOC_FAILURE;
351 BIO_indent(bp, indent, 128);
352 if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
356 if (!ASN1_bn_print(bp, "private-key:", priv_key, m, indent))
358 if (!ASN1_bn_print(bp, "public-key:", pub_key, m, indent))
361 if (!ASN1_bn_print(bp, "prime:", x->p, m, indent))
363 if (!ASN1_bn_print(bp, "generator:", x->g, m, indent))
365 if (x->length != 0) {
366 BIO_indent(bp, indent, 128);
367 if (BIO_printf(bp, "recommended-private-length: %d bits\n",
368 (int)x->length) <= 0)
375 DHerr(DH_F_DO_DH_PRINT, reason);
382 static int int_dh_size(const EVP_PKEY *pkey)
384 return (DH_size(pkey->pkey.dh));
387 static int dh_bits(const EVP_PKEY *pkey)
389 return BN_num_bits(pkey->pkey.dh->p);
392 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
394 if (BN_cmp(a->pkey.dh->p, b->pkey.dh->p) ||
395 BN_cmp(a->pkey.dh->g, b->pkey.dh->g))
401 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
405 if ((a = BN_dup(from->pkey.dh->p)) == NULL)
407 if (to->pkey.dh->p != NULL)
408 BN_free(to->pkey.dh->p);
411 if ((a = BN_dup(from->pkey.dh->g)) == NULL)
413 if (to->pkey.dh->g != NULL)
414 BN_free(to->pkey.dh->g);
420 static int dh_missing_parameters(const EVP_PKEY *a)
422 if (!a->pkey.dh->p || !a->pkey.dh->g)
427 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
429 if (dh_cmp_parameters(a, b) == 0)
431 if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
437 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
440 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
443 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
446 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
449 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
452 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
455 int DHparams_print(BIO *bp, const DH *x)
457 return do_dh_print(bp, x, 4, NULL, 0);
460 const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
466 "OpenSSL PKCS#3 DH method",
482 dh_missing_parameters,