crypto/dh/dh_ameth.c

   1 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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 "asn1_locl.h"
  64
  65 static void int_dh_free(EVP_PKEY *pkey)
  66         {
  67         DH_free(pkey->pkey.dh);
  68         }
  69
  70 static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
  71         {
  72         const unsigned char *p, *pm;
  73         int pklen, pmlen;
  74         int ptype;
  75         void *pval;
  76         ASN1_STRING *pstr;
  77         X509_ALGOR *palg;
  78         ASN1_INTEGER *public_key = NULL;
  79
  80         DH *dh = NULL;
  81
  82         if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
  83                 return 0;
  84         X509_ALGOR_get0(NULL, &ptype, &pval, palg);
  85
  86         if (ptype != V_ASN1_SEQUENCE)
  87                 {
  88                 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
  89                 goto err;
  90                 }
  91
  92         pstr = pval;
  93         pm = pstr->data;
  94         pmlen = pstr->length;
  95
  96         if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
  97                 {
  98                 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
  99                 goto err;
 100                 }
 101
 102         if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
 103                 {
 104                 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
 105                 goto err;
 106                 }
 107
 108         /* We have parameters now set public key */
 109         if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
 110                 {
 111                 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
 112                 goto err;
 113                 }
 114
 115         ASN1_INTEGER_free(public_key);
 116         EVP_PKEY_assign_DH(pkey, dh);
 117         return 1;
 118
 119         err:
 120         if (pubkey)
 121                 ASN1_INTEGER_free(public_key);
 122         if (dh)
 123                 DH_free(dh);
 124         return 0;
 125
 126         }
 127
 128 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
 129         {
 130         DH *dh;
 131         void *pval = NULL;
 132         int ptype;
 133         unsigned char *penc = NULL;
 134         int penclen;
 135         ASN1_STRING *str;
 136         ASN1_INTEGER *pub_key = NULL;
 137
 138         dh=pkey->pkey.dh;
 139
 140         str = ASN1_STRING_new();
 141         str->length = i2d_DHparams(dh, &str->data);
 142         if (str->length <= 0)
 143                 {
 144                 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 145                 goto err;
 146                 }
 147         pval = str;
 148         ptype = V_ASN1_SEQUENCE;
 149
 150         pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
 151         if (!pub_key)
 152                 goto err;
 153
 154         penclen = i2d_ASN1_INTEGER(pub_key, &penc);
 155
 156         ASN1_INTEGER_free(pub_key);
 157
 158         if (penclen <= 0)
 159                 {
 160                 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
 161                 goto err;
 162                 }
 163
 164         if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH),
 165                                 ptype, pval, penc, penclen))
 166                 return 1;
 167
 168         err:
 169         if (penc)
 170                 OPENSSL_free(penc);
 171         if (pval)
 172                 ASN1_STRING_free(pval);
 173
 174         return 0;
 175         }
 176
 177 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 178         {
 179         int i;
 180         if (!b)
 181                 return;
 182         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 183                         *pbuflen = i;
 184         }
 185
 186 static int dh_param_decode(EVP_PKEY *pkey,
 187                                         const unsigned char **pder, int derlen)
 188         {
 189         DH *dh;
 190         if (!(dh = d2i_DHparams(NULL, pder, derlen)))
 191                 {
 192                 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
 193                 return 0;
 194                 }
 195         EVP_PKEY_assign_DH(pkey, dh);
 196         return 1;
 197         }
 198
 199 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 200         {
 201         return i2d_DHparams(pkey->pkey.dh, pder);
 202         }
 203
 204 static int do_dh_print(BIO *bp, const DH *x, int indent,
 205                                                 ASN1_PCTX *ctx, int ptype)
 206         {
 207         unsigned char *m=NULL;
 208         int reason=ERR_R_BUF_LIB,ret=0;
 209         size_t buf_len=0;
 210
 211         const char *ktype = NULL;
 212
 213         BIGNUM *priv_key, *pub_key;
 214
 215         if (ptype == 2)
 216                 priv_key = x->priv_key;
 217         else
 218                 priv_key = NULL;
 219
 220         if (ptype > 0)
 221                 pub_key = x->pub_key;
 222         else
 223                 pub_key = NULL;
 224
 225         update_buflen(x->p, &buf_len);
 226
 227         if (buf_len == 0)
 228                 {
 229                 reason = ERR_R_PASSED_NULL_PARAMETER;
 230                 goto err;
 231                 }
 232
 233         update_buflen(x->g, &buf_len);
 234         update_buflen(pub_key, &buf_len);
 235         update_buflen(priv_key, &buf_len);
 236
 237         if (ptype == 2)
 238                 ktype = "PKCS#3 DH Private-Key";
 239         else if (ptype == 1)
 240                 ktype = "PKCS#3 DH Public-Key";
 241         else
 242                 ktype = "PKCS#3 DH Parameters";
 243
 244         m= OPENSSL_malloc(buf_len+10);
 245         if (m == NULL)
 246                 {
 247                 reason=ERR_R_MALLOC_FAILURE;
 248                 goto err;
 249                 }
 250
 251         BIO_indent(bp, indent, 128);
 252         if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
 253                 goto err;
 254         indent += 4;
 255
 256         if (!ASN1_bn_print(bp,"private-key:",priv_key,m,indent)) goto err;
 257         if (!ASN1_bn_print(bp,"public-key:",pub_key,m,indent)) goto err;
 258
 259         if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err;
 260         if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err;
 261         if (x->length != 0)
 262                 {
 263                 BIO_indent(bp, indent, 128);
 264                 if (BIO_printf(bp,"recommended-private-length: %d bits\n",
 265                         (int)x->length) <= 0) goto err;
 266                 }
 267
 268
 269         ret=1;
 270         if (0)
 271                 {
 272 err:
 273                 DHerr(DH_F_DHPARAMS_PRINT,reason);
 274                 }
 275         if (m != NULL) OPENSSL_free(m);
 276         return(ret);
 277         }
 278
 279 static int int_dh_size(const EVP_PKEY *pkey)
 280         {
 281         return(DH_size(pkey->pkey.dh));
 282         }
 283
 284 static int dh_bits(const EVP_PKEY *pkey)
 285         {
 286         return BN_num_bits(pkey->pkey.dh->p);
 287         }
 288
 289 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 290         {
 291         BIGNUM *a;
 292
 293         if ((a=BN_dup(from->pkey.dh->p)) == NULL)
 294                 return 0;
 295         if (to->pkey.dsa->p != NULL)
 296                 BN_free(to->pkey.dh->p);
 297         to->pkey.dsa->p=a;
 298
 299         if ((a=BN_dup(from->pkey.dh->g)) == NULL)
 300                 return 0;
 301         if (to->pkey.dsa->g != NULL)
 302                 BN_free(to->pkey.dh->g);
 303         to->pkey.dh->g=a;
 304
 305         return 1;
 306         }
 307
 308 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 309         {
 310         if (    BN_cmp(a->pkey.dh->p,b->pkey.dsa->p) ||
 311                 BN_cmp(a->pkey.dh->g,b->pkey.dsa->g))
 312                 return 0;
 313         else
 314                 return 1;
 315         }
 316
 317 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 318         {
 319         if (dh_cmp_parameters(a, b) == 0)
 320                 return 0;
 321         if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->pub_key) != 0)
 322                 return 0;
 323         else
 324                 return 1;
 325         }
 326
 327 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 328                                                         ASN1_PCTX *ctx)
 329         {
 330         return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
 331         }
 332
 333 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 334                                                         ASN1_PCTX *ctx)
 335         {
 336         return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
 337         }
 338
 339 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 340                                                         ASN1_PCTX *ctx)
 341         {
 342         return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
 343         }
 344
 345 int DHparams_print(BIO *bp, const DH *x)
 346         {
 347         return do_dh_print(bp, x, 4, NULL, 0);
 348         }
 349
 350 const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
 351         {
 352         EVP_PKEY_DH,
 353         EVP_PKEY_DH,
 354         0,
 355
 356         "DH",
 357         "OpenSSL PKCS#3 DH method",
 358
 359         dh_pub_decode,
 360         dh_pub_encode,
 361         dh_pub_cmp,
 362         dh_public_print,
 363
 364         0,
 365         0,
 366         dh_private_print,
 367
 368         int_dh_size,
 369         dh_bits,
 370
 371         dh_param_decode,
 372         dh_param_encode,
 373         0,
 374         dh_copy_parameters,
 375         dh_cmp_parameters,
 376         dh_param_print,
 377
 378         int_dh_free,
 379         0
 380         };
 381