1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 /* ====================================================================
5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
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"
66 extern const EVP_PKEY_ASN1_METHOD dhx_asn1_meth;
68 /* i2d/d2i like DH parameter functions which use the appropriate routine
69 * for PKCS#3 DH or X9.42 DH.
72 static DH * d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp, long length)
74 if (pkey->ameth == &dhx_asn1_meth)
75 return d2i_DHxparams(NULL, pp, length);
76 return d2i_DHparams(NULL, pp, length);
79 static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
81 if (pkey->ameth == &dhx_asn1_meth)
82 return i2d_DHxparams(a, pp);
83 return i2d_DHparams(a, pp);
86 static void int_dh_free(EVP_PKEY *pkey)
88 DH_free(pkey->pkey.dh);
91 static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
93 const unsigned char *p, *pm;
99 ASN1_INTEGER *public_key = NULL;
103 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
105 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
107 if (ptype != V_ASN1_SEQUENCE)
109 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
115 pmlen = pstr->length;
117 if (!(dh = d2i_dhp(pkey, &pm, pmlen)))
119 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
123 if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
125 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
129 /* We have parameters now set public key */
130 if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
132 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
136 ASN1_INTEGER_free(public_key);
137 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
142 ASN1_INTEGER_free(public_key);
149 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
154 unsigned char *penc = NULL;
157 ASN1_INTEGER *pub_key = NULL;
161 str = ASN1_STRING_new();
162 str->length = i2d_dhp(pkey, dh, &str->data);
163 if (str->length <= 0)
165 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
169 ptype = V_ASN1_SEQUENCE;
171 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
175 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
177 ASN1_INTEGER_free(pub_key);
181 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
185 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
186 ptype, pval, penc, penclen))
193 ASN1_STRING_free(pval);
199 /* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
200 * that the AlgorithmIdentifier contains the paramaters, the private key
201 * is explcitly included and the pubkey must be recalculated.
204 static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
206 const unsigned char *p, *pm;
212 ASN1_INTEGER *privkey = NULL;
216 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
219 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
221 if (ptype != V_ASN1_SEQUENCE)
224 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
230 pmlen = pstr->length;
231 if (!(dh = d2i_dhp(pkey, &pm, pmlen)))
233 /* We have parameters now set private key */
234 if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
236 DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR);
239 /* Calculate public key */
240 if (!DH_generate_key(dh))
243 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
245 ASN1_INTEGER_free(privkey);
250 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
256 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
258 ASN1_STRING *params = NULL;
259 ASN1_INTEGER *prkey = NULL;
260 unsigned char *dp = NULL;
263 params = ASN1_STRING_new();
267 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
271 params->length = i2d_dhp(pkey, pkey->pkey.dh, ¶ms->data);
272 if (params->length <= 0)
274 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
277 params->type = V_ASN1_SEQUENCE;
279 /* Get private key into integer */
280 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
284 DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR);
288 dplen = i2d_ASN1_INTEGER(prkey, &dp);
290 ASN1_INTEGER_free(prkey);
292 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
293 V_ASN1_SEQUENCE, params, dp, dplen))
302 ASN1_STRING_free(params);
304 ASN1_INTEGER_free(prkey);
309 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
314 if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
318 static int dh_param_decode(EVP_PKEY *pkey,
319 const unsigned char **pder, int derlen)
322 if (!(dh = d2i_dhp(pkey, pder, derlen)))
324 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
327 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
331 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
333 return i2d_dhp(pkey, pkey->pkey.dh, pder);
336 static int do_dh_print(BIO *bp, const DH *x, int indent,
337 ASN1_PCTX *ctx, int ptype)
339 unsigned char *m=NULL;
340 int reason=ERR_R_BUF_LIB,ret=0;
343 const char *ktype = NULL;
345 BIGNUM *priv_key, *pub_key;
348 priv_key = x->priv_key;
353 pub_key = x->pub_key;
357 update_buflen(x->p, &buf_len);
361 reason = ERR_R_PASSED_NULL_PARAMETER;
365 update_buflen(x->g, &buf_len);
366 update_buflen(x->q, &buf_len);
367 update_buflen(pub_key, &buf_len);
368 update_buflen(priv_key, &buf_len);
371 ktype = "DH Private-Key";
373 ktype = "DH Public-Key";
375 ktype = "DH Parameters";
377 m= OPENSSL_malloc(buf_len+10);
380 reason=ERR_R_MALLOC_FAILURE;
384 BIO_indent(bp, indent, 128);
385 if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
389 if (!ASN1_bn_print(bp,"private-key:",priv_key,m,indent)) goto err;
390 if (!ASN1_bn_print(bp,"public-key:",pub_key,m,indent)) goto err;
392 if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err;
393 if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err;
394 if (x->q && !ASN1_bn_print(bp,"subgroup order:",x->q,m,indent)) goto err;
397 BIO_indent(bp, indent, 128);
398 if (BIO_printf(bp,"recommended-private-length: %d bits\n",
399 (int)x->length) <= 0) goto err;
407 DHerr(DH_F_DO_DH_PRINT,reason);
409 if (m != NULL) OPENSSL_free(m);
413 static int int_dh_size(const EVP_PKEY *pkey)
415 return(DH_size(pkey->pkey.dh));
418 static int dh_bits(const EVP_PKEY *pkey)
420 return BN_num_bits(pkey->pkey.dh->p);
423 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
425 if ( BN_cmp(a->pkey.dh->p,b->pkey.dh->p) ||
426 BN_cmp(a->pkey.dh->g,b->pkey.dh->g))
428 else if (a->ameth == &dhx_asn1_meth)
430 if (BN_cmp(a->pkey.dh->q,b->pkey.dh->q))
436 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
440 if ((a=BN_dup(from->pkey.dh->p)) == NULL)
442 if (to->pkey.dh->p != NULL)
443 BN_free(to->pkey.dh->p);
446 if ((a=BN_dup(from->pkey.dh->g)) == NULL)
448 if (to->pkey.dh->g != NULL)
449 BN_free(to->pkey.dh->g);
451 if (from->ameth == &dhx_asn1_meth)
453 a = BN_dup(from->pkey.dh->q);
457 BN_free(to->pkey.dh->q);
464 static int dh_missing_parameters(const EVP_PKEY *a)
466 if (!a->pkey.dh->p || !a->pkey.dh->g)
471 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
473 if (dh_cmp_parameters(a, b) == 0)
475 if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->pub_key) != 0)
481 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
484 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
487 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
490 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
493 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
496 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
499 int DHparams_print(BIO *bp, const DH *x)
501 return do_dh_print(bp, x, 4, NULL, 0);
504 const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
511 "OpenSSL PKCS#3 DH method",
527 dh_missing_parameters,
537 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth =
544 "OpenSSL X9.42 DH method",
560 dh_missing_parameters,