1 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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 "asn1_locl.h"
65 static void int_dh_free(EVP_PKEY *pkey)
67 DH_free(pkey->pkey.dh);
70 static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
72 const unsigned char *p, *pm;
78 ASN1_INTEGER *public_key = NULL;
82 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
84 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
86 if (ptype != V_ASN1_SEQUENCE)
88 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
96 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)))
104 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
108 /* We have parameters now set public key */
109 if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
111 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
115 ASN1_INTEGER_free(public_key);
116 EVP_PKEY_assign_DH(pkey, dh);
121 ASN1_INTEGER_free(public_key);
128 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
133 unsigned char *penc = NULL;
136 ASN1_INTEGER *pub_key = NULL;
140 str = ASN1_STRING_new();
141 str->length = i2d_DHparams(dh, &str->data);
142 if (str->length <= 0)
144 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
148 ptype = V_ASN1_SEQUENCE;
150 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
154 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
156 ASN1_INTEGER_free(pub_key);
160 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
164 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH),
165 ptype, pval, penc, penclen))
172 ASN1_STRING_free(pval);
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.
183 static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
185 const unsigned char *p, *pm;
191 ASN1_INTEGER *privkey = NULL;
195 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
198 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
200 if (ptype != V_ASN1_SEQUENCE)
203 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
209 pmlen = pstr->length;
210 if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
212 /* We have parameters now set private key */
213 if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
215 DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR);
218 /* Calculate public key */
219 if (!DH_generate_key(dh))
222 EVP_PKEY_assign_DH(pkey, dh);
224 ASN1_INTEGER_free(privkey);
229 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
235 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
237 ASN1_STRING *params = NULL;
238 ASN1_INTEGER *prkey = NULL;
239 unsigned char *dp = NULL;
242 params = ASN1_STRING_new();
246 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
250 params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data);
251 if (params->length <= 0)
253 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
256 params->type = V_ASN1_SEQUENCE;
258 /* Get private key into integer */
259 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
263 DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR);
267 dplen = i2d_ASN1_INTEGER(prkey, &dp);
269 ASN1_INTEGER_free(prkey);
271 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0,
272 V_ASN1_SEQUENCE, params, dp, dplen))
281 ASN1_STRING_free(params);
283 ASN1_INTEGER_free(prkey);
288 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
293 if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
297 static int dh_param_decode(EVP_PKEY *pkey,
298 const unsigned char **pder, int derlen)
301 if (!(dh = d2i_DHparams(NULL, pder, derlen)))
303 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
306 EVP_PKEY_assign_DH(pkey, dh);
310 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
312 return i2d_DHparams(pkey->pkey.dh, pder);
315 static int do_dh_print(BIO *bp, const DH *x, int indent,
316 ASN1_PCTX *ctx, int ptype)
318 unsigned char *m=NULL;
319 int reason=ERR_R_BUF_LIB,ret=0;
322 const char *ktype = NULL;
324 BIGNUM *priv_key, *pub_key;
327 priv_key = x->priv_key;
332 pub_key = x->pub_key;
336 update_buflen(x->p, &buf_len);
340 reason = ERR_R_PASSED_NULL_PARAMETER;
344 update_buflen(x->g, &buf_len);
345 update_buflen(pub_key, &buf_len);
346 update_buflen(priv_key, &buf_len);
349 ktype = "PKCS#3 DH Private-Key";
351 ktype = "PKCS#3 DH Public-Key";
353 ktype = "PKCS#3 DH Parameters";
355 m= OPENSSL_malloc(buf_len+10);
358 reason=ERR_R_MALLOC_FAILURE;
362 BIO_indent(bp, indent, 128);
363 if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
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;
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;
374 BIO_indent(bp, indent, 128);
375 if (BIO_printf(bp,"recommended-private-length: %d bits\n",
376 (int)x->length) <= 0) goto err;
384 DHerr(DH_F_DHPARAMS_PRINT,reason);
386 if (m != NULL) OPENSSL_free(m);
390 static int int_dh_size(const EVP_PKEY *pkey)
392 return(DH_size(pkey->pkey.dh));
395 static int dh_bits(const EVP_PKEY *pkey)
397 return BN_num_bits(pkey->pkey.dh->p);
400 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
402 if ( BN_cmp(a->pkey.dh->p,b->pkey.dh->p) ||
403 BN_cmp(a->pkey.dh->g,b->pkey.dh->g))
409 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
413 if ((a=BN_dup(from->pkey.dh->p)) == NULL)
415 if (to->pkey.dh->p != NULL)
416 BN_free(to->pkey.dh->p);
419 if ((a=BN_dup(from->pkey.dh->g)) == NULL)
421 if (to->pkey.dh->g != NULL)
422 BN_free(to->pkey.dh->g);
428 static int dh_missing_parameters(const EVP_PKEY *a)
430 if (!a->pkey.dh->p || !a->pkey.dh->g)
435 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
437 if (dh_cmp_parameters(a, b) == 0)
439 if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->pub_key) != 0)
445 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
448 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
451 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
454 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
457 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
460 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
463 int DHparams_print(BIO *bp, const DH *x)
465 return do_dh_print(bp, x, 4, NULL, 0);
468 const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
475 "OpenSSL PKCS#3 DH method",
491 dh_missing_parameters,