engines/ccgost/gost_ameth.c

   1 /**********************************************************************
   2  *                          gost_ameth.c                              *
   3  *             Copyright (c) 2005-2006 Cryptocom LTD                  *
   4  *         This file is distributed under the same license as OpenSSL *
   5  *                                                                    *
   6  *       Implementation of RFC 4490/4491 ASN1 method                  *
   7  *       for OpenSSL                                                  *
   8  *          Requires OpenSSL 0.9.9 for compilation                    *
   9  **********************************************************************/
  10 #include <string.h>
  11 #include <openssl/crypto.h>
  12 #include <openssl/err.h>
  13 #include <openssl/engine.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/asn1.h>
  16 #include "gost_params.h"
  17 #include "gost_lcl.h"
  18 #include "e_gost_err.h"
  19
  20 int gost94_nid_by_params(DSA *p)
  21         {
  22         R3410_params *gost_params;
  23         BIGNUM *q=BN_new();
  24         for (gost_params = R3410_paramset;gost_params->q!=NULL; gost_params++)
  25                 {
  26                 BN_dec2bn(&q,gost_params->q);
  27                 if (!BN_cmp(q,p->q))
  28                         {
  29                         BN_free(q);
  30                         return gost_params->nid;
  31                         }
  32                 }
  33         BN_free(q);
  34         return NID_undef;
  35         }
  36
  37 static ASN1_STRING  *encode_gost_algor_params(const EVP_PKEY *key)
  38         {
  39         ASN1_STRING *params = ASN1_STRING_new();
  40         GOST_KEY_PARAMS *gkp = GOST_KEY_PARAMS_new();
  41         int pkey_param_nid = NID_undef;
  42
  43         if (!params || !gkp)
  44                 {
  45                 GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS,
  46                         ERR_R_MALLOC_FAILURE);
  47                 ASN1_STRING_free(params);
  48                 params = NULL;
  49                 goto err;
  50                 }
  51         switch (EVP_PKEY_base_id(key))
  52                 {
  53                 case NID_id_GostR3410_2001:
  54                         pkey_param_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)key)));
  55                         break;
  56                 case NID_id_GostR3410_94:
  57                         pkey_param_nid = (int) gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)key));
  58                         if (pkey_param_nid == NID_undef)
  59                                 {
  60                                 GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS,
  61                                         GOST_R_INVALID_GOST94_PARMSET);
  62                                 ASN1_STRING_free(params);
  63                                 params=NULL;
  64                                 goto err;
  65                                 }
  66                         break;
  67                 }
  68         gkp->key_params = OBJ_nid2obj(pkey_param_nid);
  69         gkp->hash_params = OBJ_nid2obj(NID_id_GostR3411_94_CryptoProParamSet);
  70         /*gkp->cipher_params = OBJ_nid2obj(cipher_param_nid);*/
  71         params->length = i2d_GOST_KEY_PARAMS(gkp, &params->data);
  72         if (params->length <=0 )
  73                 {
  74                 GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS,
  75                         ERR_R_MALLOC_FAILURE);
  76                 ASN1_STRING_free(params);
  77                 params = NULL;
  78                 goto err;
  79                 }
  80         params ->type = V_ASN1_SEQUENCE;
  81         err:
  82         GOST_KEY_PARAMS_free(gkp);
  83         return params;
  84         }
  85
  86 /* Parses GOST algorithm parameters from X509_ALGOR and
  87  * modifies pkey setting NID and parameters
  88  */
  89 static int decode_gost_algor_params(EVP_PKEY *pkey, X509_ALGOR *palg)
  90         {
  91         ASN1_OBJECT *palg_obj =NULL;
  92         int ptype = V_ASN1_UNDEF;
  93         int pkey_nid = NID_undef,param_nid = NID_undef;
  94         void *_pval;
  95         ASN1_STRING *pval = NULL;
  96         const unsigned char  *p;
  97         GOST_KEY_PARAMS *gkp = NULL;
  98
  99         X509_ALGOR_get0(&palg_obj, &ptype, &_pval, palg);
 100         pval = _pval;
 101         if (ptype != V_ASN1_SEQUENCE)
 102                 {
 103                 GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
 104                         GOST_R_BAD_KEY_PARAMETERS_FORMAT);
 105                 return 0;
 106                 }
 107         p=pval->data;
 108         pkey_nid = OBJ_obj2nid(palg_obj);
 109
 110         gkp = d2i_GOST_KEY_PARAMS(NULL,&p,pval->length);
 111         if (!gkp)
 112                 {
 113                 GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
 114                         GOST_R_BAD_PKEY_PARAMETERS_FORMAT);
 115                 return 0;
 116                 }
 117         param_nid = OBJ_obj2nid(gkp->key_params);
 118         GOST_KEY_PARAMS_free(gkp);
 119         EVP_PKEY_set_type(pkey,pkey_nid);
 120         switch (pkey_nid)
 121                 {
 122                 case NID_id_GostR3410_94:
 123                 {
 124                 DSA *dsa= EVP_PKEY_get0(pkey);
 125                 if (!dsa)
 126                         {
 127                         dsa = DSA_new();
 128                         if (!EVP_PKEY_assign(pkey,pkey_nid,dsa)) return 0;
 129                         }
 130                 if (!fill_GOST94_params(dsa,param_nid)) return 0;
 131                 break;
 132                 }
 133                 case NID_id_GostR3410_2001:
 134                 {
 135                 EC_KEY *ec = EVP_PKEY_get0(pkey);
 136                 if (!ec)
 137                         {
 138                         ec = EC_KEY_new();
 139                         if (!EVP_PKEY_assign(pkey,pkey_nid,ec)) return 0;
 140                         }
 141                 if (!fill_GOST2001_params(ec,param_nid)) return 0;
 142                 }
 143                 }
 144
 145         return 1;
 146         }
 147
 148 static int gost_set_priv_key(EVP_PKEY *pkey,BIGNUM *priv)
 149         {
 150         switch (EVP_PKEY_base_id(pkey))
 151                 {
 152                 case NID_id_GostR3410_94:
 153                 {
 154                 DSA *dsa = EVP_PKEY_get0(pkey);
 155                 if (!dsa)
 156                         {
 157                         dsa = DSA_new();
 158                         EVP_PKEY_assign(pkey,EVP_PKEY_base_id(pkey),dsa);
 159                         }
 160                 dsa->priv_key = BN_dup(priv);
 161                 if (!EVP_PKEY_missing_parameters(pkey))
 162                         gost94_compute_public(dsa);
 163                 break;
 164                 }
 165                 case NID_id_GostR3410_2001:
 166                 {
 167                 EC_KEY *ec = EVP_PKEY_get0(pkey);
 168                 if (!ec)
 169                         {
 170                         ec = EC_KEY_new();
 171                         EVP_PKEY_assign(pkey,EVP_PKEY_base_id(pkey),ec);
 172                         }
 173                 if (!EC_KEY_set_private_key(ec,priv)) return 0;
 174                 if (!EVP_PKEY_missing_parameters(pkey))
 175                         gost2001_compute_public(ec);
 176                 break;
 177                 }
 178                 }
 179         return 1;
 180         }
 181 BIGNUM* gost_get0_priv_key(const EVP_PKEY *pkey)
 182         {
 183         switch (EVP_PKEY_base_id(pkey))
 184                 {
 185                 case NID_id_GostR3410_94:
 186                 {
 187                 DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pkey);
 188                 if (!dsa)
 189                         {
 190                         return NULL;
 191                         }
 192                 if (!dsa->priv_key) return NULL;
 193                 return dsa->priv_key;
 194                 break;
 195                 }
 196                 case NID_id_GostR3410_2001:
 197                 {
 198                 EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pkey);
 199                 const BIGNUM* priv;
 200                 if (!ec)
 201                         {
 202                         return NULL;
 203                         }
 204                 if (!(priv=EC_KEY_get0_private_key(ec))) return NULL;
 205                 return (BIGNUM *)priv;
 206                 break;
 207                 }
 208                 }
 209         return NULL;
 210         }
 211
 212 static int pkey_ctrl_gost(EVP_PKEY *pkey, int op,
 213         long arg1, void *arg2)
 214         {
 215         switch (op)
 216                 {
 217                 case ASN1_PKEY_CTRL_PKCS7_SIGN:
 218                         if (arg1 == 0)
 219                                 {
 220                                 X509_ALGOR *alg1 = NULL, *alg2 = NULL;
 221                                 int nid = EVP_PKEY_base_id(pkey);
 222                                 PKCS7_SIGNER_INFO_get0_algs((PKCS7_SIGNER_INFO*)arg2,
 223                                         NULL, &alg1, &alg2);
 224                                 X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
 225                                         V_ASN1_NULL, 0);
 226                                 if (nid == NID_undef)
 227                                         {
 228                                         return (-1);
 229                                         }
 230                                 X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
 231                                 }
 232                         return 1;
 233                 case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
 234                         if (arg1 == 0)
 235                                 {
 236                                 X509_ALGOR *alg;
 237                                 ASN1_STRING * params = encode_gost_algor_params(pkey);
 238                                 if (!params)
 239                                         {
 240                                         return -1;
 241                                         }
 242                                 PKCS7_RECIP_INFO_get0_alg((PKCS7_RECIP_INFO*)arg2, &alg);
 243                                 X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type),
 244                                         V_ASN1_SEQUENCE, params);
 245                                 }
 246                         return 1;
 247                 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 248                         *(int *)arg2 = NID_id_GostR3411_94;
 249                         return 2;
 250                 }
 251
 252         return -2;
 253         }
 254 /*----------------------- free functions * ------------------------------*/
 255 static void pkey_free_gost94(EVP_PKEY *key)
 256         {
 257         if (key->pkey.dsa)
 258                 {
 259                 DSA_free(key->pkey.dsa);
 260                 }
 261         }
 262
 263 static void pkey_free_gost01(EVP_PKEY *key)
 264         {
 265         if (key->pkey.ec)
 266                 {
 267                 EC_KEY_free(key->pkey.ec);
 268                 }
 269         }
 270
 271 /* ------------------ private key functions  -----------------------------*/
 272 static int priv_decode_gost( EVP_PKEY *pk, PKCS8_PRIV_KEY_INFO *p8inf)
 273         {
 274         const unsigned char *pkey_buf = NULL,*p=NULL;
 275         int priv_len = 0;
 276         BIGNUM *pk_num=NULL;
 277         int ret =0;
 278         X509_ALGOR *palg =NULL;
 279         ASN1_OBJECT *palg_obj = NULL;
 280         ASN1_INTEGER *priv_key=NULL;
 281
 282         if (!PKCS8_pkey_get0(&palg_obj,&pkey_buf,&priv_len,&palg,p8inf))
 283                 return 0;
 284         p = pkey_buf;
 285         if (!decode_gost_algor_params(pk,palg))
 286                 {
 287                 return 0;
 288                 }
 289         if (V_ASN1_OCTET_STRING == *p)
 290                 {
 291                 /* New format - Little endian octet string */
 292                 unsigned char rev_buf[32];
 293                 int i;
 294                 ASN1_OCTET_STRING *s = d2i_ASN1_OCTET_STRING(NULL,&p,priv_len);
 295                 if (!s||s->length !=32)
 296                         {
 297                         GOSTerr(GOST_F_PRIV_DECODE_GOST,
 298                                 EVP_R_DECODE_ERROR);
 299                         return 0;
 300                         }
 301                 for (i=0;i<32;i++)
 302                         {
 303                         rev_buf[31-i]=s->data[i];
 304                         }
 305                 ASN1_STRING_free(s);
 306                 pk_num = getbnfrombuf(rev_buf,32);
 307                 }
 308         else
 309                 {
 310                 priv_key=d2i_ASN1_INTEGER(NULL,&p,priv_len);
 311                 if (!priv_key) return 0;
 312                 ret= ((pk_num =  ASN1_INTEGER_to_BN(priv_key, NULL))!=NULL) ;
 313                 ASN1_INTEGER_free(priv_key);
 314                 if (!ret)
 315                         {
 316                         GOSTerr(GOST_F_PRIV_DECODE_GOST,
 317                                 EVP_R_DECODE_ERROR);
 318                         return 0;
 319                         }
 320                 }
 321
 322         ret= gost_set_priv_key(pk,pk_num);
 323         BN_free(pk_num);
 324         return ret;
 325         }
 326
 327 /* ----------------------------------------------------------------------*/
 328 static int priv_encode_gost(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk)
 329         {
 330         ASN1_OBJECT *algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
 331         ASN1_STRING *params = encode_gost_algor_params(pk);
 332         unsigned char *priv_buf = NULL;
 333         int priv_len;
 334
 335         ASN1_INTEGER *asn1key=NULL;
 336         if (!params)
 337                 {
 338                 return 0;
 339                 }
 340         asn1key = BN_to_ASN1_INTEGER(gost_get0_priv_key(pk),NULL);
 341         priv_len = i2d_ASN1_INTEGER(asn1key,&priv_buf);
 342         ASN1_INTEGER_free(asn1key);
 343         return PKCS8_pkey_set0(p8,algobj,0,V_ASN1_SEQUENCE,params,
 344                 priv_buf,priv_len);
 345         }
 346 /* --------- printing keys --------------------------------*/
 347 static int print_gost_94(BIO *out, const EVP_PKEY *pkey, int indent,
 348         ASN1_PCTX *pctx, int type)
 349         {
 350         int param_nid = NID_undef;
 351
 352         if (type == 2)
 353                 {
 354                 BIGNUM *key;
 355
 356                 if (!BIO_indent(out,indent,128)) return 0;
 357                 BIO_printf(out,"Private key: ");
 358                 key = gost_get0_priv_key(pkey);
 359                 if (!key)
 360                         BIO_printf(out,"<undefined>");
 361                 else
 362                         BN_print(out,key);
 363                 BIO_printf(out,"\n");
 364                 }
 365         if (type >= 1)
 366                 {
 367                 BIGNUM *pubkey;
 368
 369                 pubkey = ((DSA *)EVP_PKEY_get0((EVP_PKEY *)pkey))->pub_key;
 370                 BIO_indent(out,indent,128);
 371                 BIO_printf(out,"Public key: ");
 372                 BN_print(out,pubkey);
 373                 BIO_printf(out,"\n");
 374         }
 375
 376         param_nid = gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)pkey));
 377         BIO_indent(out,indent,128);
 378         BIO_printf(out, "Parameter set: %s\n",OBJ_nid2ln(param_nid));
 379         return 1;
 380 }
 381
 382 static int param_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
 383         ASN1_PCTX *pctx)
 384         {
 385         return print_gost_94(out, pkey, indent, pctx,0);
 386         }
 387
 388 static int pub_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
 389         ASN1_PCTX *pctx)
 390         {
 391         return print_gost_94(out,pkey, indent, pctx,1);
 392         }
 393 static int priv_print_gost94(BIO *out,const EVP_PKEY *pkey, int indent,
 394         ASN1_PCTX *pctx)
 395         {
 396         return print_gost_94(out,pkey,indent,pctx,2);
 397         }
 398
 399 static int print_gost_01(BIO *out, const EVP_PKEY *pkey, int indent,
 400         ASN1_PCTX *pctx, int type)
 401         {
 402         int param_nid = NID_undef;
 403         if (type == 2)
 404                 {
 405                 BIGNUM *key;
 406
 407                 if (!BIO_indent(out,indent,128)) return 0;
 408                 BIO_printf(out,"Private key: ");
 409                 key = gost_get0_priv_key(pkey);
 410                 if (!key)
 411                         BIO_printf(out,"<undefined)");
 412                 else
 413                         BN_print(out,key);
 414                 BIO_printf(out,"\n");
 415                 }
 416         if (type >= 1)
 417                 {
 418                 BN_CTX *ctx = BN_CTX_new();
 419                 BIGNUM *X,*Y;
 420                 const EC_POINT *pubkey;
 421                 const EC_GROUP *group;
 422
 423                 if (!ctx)
 424                         {
 425                         GOSTerr(GOST_F_PRINT_GOST_01,ERR_R_MALLOC_FAILURE);
 426                         return 0;
 427                         }
 428                 BN_CTX_start(ctx);
 429                 X = BN_CTX_get(ctx);
 430                 Y = BN_CTX_get(ctx);
 431                 pubkey = EC_KEY_get0_public_key((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
 432                 group = EC_KEY_get0_group((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
 433                 if (!EC_POINT_get_affine_coordinates_GFp(group,pubkey,X,Y,ctx))
 434                         {
 435                         GOSTerr(GOST_F_PRINT_GOST_01,ERR_R_EC_LIB);
 436                         BN_CTX_free(ctx);
 437                         return 0;
 438                         }
 439                 if (!BIO_indent(out,indent,128)) return 0;
 440                 BIO_printf(out,"Public key:\n");
 441                 if (!BIO_indent(out,indent+3,128)) return 0;
 442                 BIO_printf(out,"X:");
 443                 BN_print(out,X);
 444                 BIO_printf(out,"\n");
 445                 BIO_indent(out,indent+3,128);
 446                 BIO_printf(out,"Y:");
 447                 BN_print(out,Y);
 448                 BIO_printf(out,"\n");
 449                 BN_CTX_end(ctx);
 450                 BN_CTX_free(ctx);
 451                 }
 452
 453         param_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)pkey)));
 454         if (!BIO_indent(out,indent,128)) return 0;
 455         BIO_printf(out,"Parameter set: %s\n",OBJ_nid2ln(param_nid));
 456         return 1;
 457 }
 458 static int param_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
 459         ASN1_PCTX *pctx)
 460         {
 461         return print_gost_01(out,pkey,indent,pctx,0);
 462         }
 463 static int pub_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
 464         ASN1_PCTX *pctx)
 465         {
 466         return print_gost_01(out,pkey, indent, pctx,1);
 467         }
 468 static int priv_print_gost01(BIO *out,const EVP_PKEY *pkey, int indent,
 469         ASN1_PCTX *pctx)
 470         {
 471         return print_gost_01(out,pkey,indent,pctx,2);
 472         }
 473 /* ---------------------------------------------------------------------*/
 474 static int param_missing_gost94(const EVP_PKEY *pk)
 475         {
 476         const DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pk);
 477         if (!dsa) return 1;
 478         if (!dsa->q) return 1;
 479         return 0;
 480         }
 481
 482 static int param_missing_gost01(const EVP_PKEY *pk)
 483         {
 484         const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
 485         if (!ec) return 1;
 486         if (!EC_KEY_get0_group(ec)) return 1;
 487         return 0;
 488         }
 489
 490 static int param_copy_gost94(EVP_PKEY *to, const EVP_PKEY *from)
 491         {
 492         const DSA *dfrom = EVP_PKEY_get0((EVP_PKEY *)from);
 493         DSA *dto = EVP_PKEY_get0(to);
 494         if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to))
 495                 {
 496                 GOSTerr(GOST_F_PARAM_COPY_GOST94,
 497                         GOST_R_INCOMPATIBLE_ALGORITHMS);
 498                 return 0;
 499                 }
 500         if (!dfrom)
 501                 {
 502                 GOSTerr(GOST_F_PARAM_COPY_GOST94,
 503                         GOST_R_KEY_PARAMETERS_MISSING);
 504                 return 0;
 505                 }
 506         if (!dto)
 507                 {
 508                 dto = DSA_new();
 509                 EVP_PKEY_assign(to,EVP_PKEY_base_id(from),dto);
 510                 }
 511 #define COPYBIGNUM(a,b,x) if (a->x) BN_free(a->x); a->x=BN_dup(b->x);
 512         COPYBIGNUM(dto,dfrom,p)
 513                 COPYBIGNUM(dto,dfrom,q)
 514                 COPYBIGNUM(dto,dfrom,g)
 515
 516                 if (dto->priv_key)
 517                         gost94_compute_public(dto);
 518         return 1;
 519         }
 520 static int param_copy_gost01(EVP_PKEY *to, const EVP_PKEY *from)
 521         {
 522         EC_KEY *eto = EVP_PKEY_get0(to);
 523         const EC_KEY *efrom = EVP_PKEY_get0((EVP_PKEY *)from);
 524         if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to))
 525                 {
 526                 GOSTerr(GOST_F_PARAM_COPY_GOST01,
 527                         GOST_R_INCOMPATIBLE_ALGORITHMS);
 528                 return 0;
 529                 }
 530         if (!efrom)
 531                 {
 532                 GOSTerr(GOST_F_PARAM_COPY_GOST01,
 533                         GOST_R_KEY_PARAMETERS_MISSING);
 534                 return 0;
 535                 }
 536         if (!eto)
 537                 {
 538                 eto = EC_KEY_new();
 539                 EVP_PKEY_assign(to,EVP_PKEY_base_id(from),eto);
 540                 }
 541         EC_KEY_set_group(eto,EC_KEY_get0_group(efrom));
 542         if (EC_KEY_get0_private_key(eto))
 543                 {
 544                 gost2001_compute_public(eto);
 545                 }
 546         return 1;
 547         }
 548
 549 static int param_cmp_gost94(const EVP_PKEY *a, const EVP_PKEY *b)
 550         {
 551         const DSA *da = EVP_PKEY_get0((EVP_PKEY *)a);
 552         const DSA *db = EVP_PKEY_get0((EVP_PKEY *)b);
 553         if (!BN_cmp(da->q,db->q)) return 1;
 554         return 0;
 555         }
 556
 557 static int param_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
 558         {
 559         if (EC_GROUP_get_curve_name(EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)a)))==
 560                 EC_GROUP_get_curve_name(EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)b))))
 561                 {
 562                 return 1;
 563                 }
 564         return 0;
 565
 566         }
 567
 568 /* ---------- Public key functions * --------------------------------------*/
 569 static int pub_decode_gost94(EVP_PKEY *pk, X509_PUBKEY *pub)
 570         {
 571         X509_ALGOR *palg = NULL;
 572         const unsigned char *pubkey_buf = NULL;
 573         unsigned char *databuf;
 574         ASN1_OBJECT *palgobj = NULL;
 575         int pub_len,i,j;
 576         DSA *dsa;
 577         ASN1_OCTET_STRING *octet= NULL;
 578
 579         if (!X509_PUBKEY_get0_param(&palgobj,&pubkey_buf,&pub_len,
 580                         &palg, pub)) return 0;
 581         EVP_PKEY_assign(pk,OBJ_obj2nid(palgobj),NULL);
 582         if (!decode_gost_algor_params(pk,palg)) return 0;
 583         octet = d2i_ASN1_OCTET_STRING(NULL,&pubkey_buf,pub_len);
 584         if (!octet)
 585                 {
 586                 GOSTerr(GOST_F_PUB_DECODE_GOST94,ERR_R_MALLOC_FAILURE);
 587                 return 0;
 588                 }
 589         databuf = OPENSSL_malloc(octet->length);
 590         for (i=0,j=octet->length-1;i<octet->length;i++,j--)
 591                 {
 592                 databuf[j]=octet->data[i];
 593                 }
 594         dsa = EVP_PKEY_get0(pk);
 595         dsa->pub_key=BN_bin2bn(databuf,octet->length,NULL);
 596         ASN1_OCTET_STRING_free(octet);
 597         OPENSSL_free(databuf);
 598         return 1;
 599
 600         }
 601
 602 static int pub_encode_gost94(X509_PUBKEY *pub,const EVP_PKEY *pk)
 603         {
 604         ASN1_OBJECT *algobj = NULL;
 605         ASN1_OCTET_STRING *octet = NULL;
 606         void *pval = NULL;
 607         unsigned char *buf=NULL,*databuf,*sptr;
 608         int i,j,data_len,ret=0;
 609
 610         int ptype = V_ASN1_UNDEF;
 611         DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pk);
 612         algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
 613         if (pk->save_parameters)
 614                 {
 615                 ASN1_STRING *params = encode_gost_algor_params(pk);
 616                 pval = params;
 617                 ptype = V_ASN1_SEQUENCE;
 618                 }
 619         data_len = BN_num_bytes(dsa->pub_key);
 620         databuf = OPENSSL_malloc(data_len);
 621         BN_bn2bin(dsa->pub_key,databuf);
 622         octet = ASN1_OCTET_STRING_new();
 623         ASN1_STRING_set(octet,NULL,data_len);
 624         sptr = ASN1_STRING_data(octet);
 625         for (i=0,j=data_len-1; i< data_len;i++,j--)
 626                 {
 627                 sptr[i]=databuf[j];
 628                 }
 629         OPENSSL_free(databuf);
 630         ret = i2d_ASN1_OCTET_STRING(octet,&buf);
 631         ASN1_BIT_STRING_free(octet);
 632         if (ret <0)  return 0;
 633         return X509_PUBKEY_set0_param(pub,algobj,ptype,pval,buf,ret);
 634         }
 635
 636 static int pub_decode_gost01(EVP_PKEY *pk,X509_PUBKEY *pub)
 637         {
 638         X509_ALGOR *palg = NULL;
 639         const unsigned char *pubkey_buf = NULL;
 640         unsigned char *databuf;
 641         ASN1_OBJECT *palgobj = NULL;
 642         int pub_len,i,j;
 643         EC_POINT *pub_key;
 644         BIGNUM *X,*Y;
 645         ASN1_OCTET_STRING *octet= NULL;
 646         int len;
 647         const EC_GROUP *group;
 648
 649         if (!X509_PUBKEY_get0_param(&palgobj,&pubkey_buf,&pub_len,
 650                         &palg, pub)) return 0;
 651         EVP_PKEY_assign(pk,OBJ_obj2nid(palgobj),NULL);
 652         if (!decode_gost_algor_params(pk,palg)) return 0;
 653         group = EC_KEY_get0_group(EVP_PKEY_get0(pk));
 654         octet = d2i_ASN1_OCTET_STRING(NULL,&pubkey_buf,pub_len);
 655         if (!octet)
 656                 {
 657                 GOSTerr(GOST_F_PUB_DECODE_GOST01,ERR_R_MALLOC_FAILURE);
 658                 return 0;
 659                 }
 660         databuf = OPENSSL_malloc(octet->length);
 661         for (i=0,j=octet->length-1;i<octet->length;i++,j--)
 662                 {
 663                 databuf[j]=octet->data[i];
 664                 }
 665         len=octet->length/2;
 666         ASN1_OCTET_STRING_free(octet);
 667
 668         Y= getbnfrombuf(databuf,len);
 669         X= getbnfrombuf(databuf+len,len);
 670         OPENSSL_free(databuf);
 671         pub_key = EC_POINT_new(group);
 672         if (!EC_POINT_set_affine_coordinates_GFp(group
 673                         ,pub_key,X,Y,NULL))
 674                 {
 675                 GOSTerr(GOST_F_PUB_DECODE_GOST01,
 676                         ERR_R_EC_LIB);
 677                 EC_POINT_free(pub_key);
 678                 BN_free(X);
 679                 BN_free(Y);
 680                 return 0;
 681                 }
 682         BN_free(X);
 683         BN_free(Y);
 684         if (!EC_KEY_set_public_key(EVP_PKEY_get0(pk),pub_key))
 685                 {
 686                 GOSTerr(GOST_F_PUB_DECODE_GOST01,
 687                         ERR_R_EC_LIB);
 688                 EC_POINT_free(pub_key);
 689                 return 0;
 690                 }
 691         EC_POINT_free(pub_key);
 692         return 1;
 693
 694         }
 695
 696 static int pub_encode_gost01(X509_PUBKEY *pub,const EVP_PKEY *pk)
 697         {
 698         ASN1_OBJECT *algobj = NULL;
 699         ASN1_OCTET_STRING *octet = NULL;
 700         void *pval = NULL;
 701         unsigned char *buf=NULL,*databuf,*sptr;
 702         int i,j,data_len,ret=0;
 703         const EC_POINT *pub_key;
 704         BIGNUM *X,*Y,*order;
 705         const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
 706         int ptype = V_ASN1_UNDEF;
 707
 708         algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
 709         if (pk->save_parameters)
 710                 {
 711                 ASN1_STRING *params = encode_gost_algor_params(pk);
 712                 pval = params;
 713                 ptype = V_ASN1_SEQUENCE;
 714                 }
 715         order = BN_new();
 716         EC_GROUP_get_order(EC_KEY_get0_group(ec),order,NULL);
 717         pub_key=EC_KEY_get0_public_key(ec);
 718         if (!pub_key)
 719                 {
 720                 GOSTerr(GOST_F_PUB_ENCODE_GOST01,
 721                         GOST_R_PUBLIC_KEY_UNDEFINED);
 722                 return 0;
 723                 }
 724         X=BN_new();
 725         Y=BN_new();
 726         EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(ec),
 727                 pub_key,X,Y,NULL);
 728         data_len = 2*BN_num_bytes(order);
 729         BN_free(order);
 730         databuf = OPENSSL_malloc(data_len);
 731         memset(databuf,0,data_len);
 732
 733         store_bignum(X,databuf+data_len/2,data_len/2);
 734         store_bignum(Y,databuf,data_len/2);
 735
 736         BN_free(X);
 737         BN_free(Y);
 738         octet = ASN1_OCTET_STRING_new();
 739         ASN1_STRING_set(octet,NULL,data_len);
 740         sptr=ASN1_STRING_data(octet);
 741     for (i=0,j=data_len-1;i<data_len;i++,j--)
 742                 {
 743         sptr[i]=databuf[j];
 744                 }
 745     OPENSSL_free(databuf);
 746         ret = i2d_ASN1_OCTET_STRING(octet,&buf);
 747         ASN1_BIT_STRING_free(octet);
 748         if (ret <0)  return 0;
 749         return X509_PUBKEY_set0_param(pub,algobj,ptype,pval,buf,ret);
 750         }
 751
 752 static int pub_cmp_gost94(const EVP_PKEY *a, const EVP_PKEY *b)
 753         {
 754         const DSA *da = EVP_PKEY_get0((EVP_PKEY *)a);
 755         const DSA *db = EVP_PKEY_get0((EVP_PKEY *)b);
 756         if (da && db && da->pub_key && db->pub_key
 757                 && !BN_cmp(da->pub_key,db->pub_key))
 758                 {
 759                 return 1;
 760                 }
 761         return 0;
 762         }
 763
 764 static int pub_cmp_gost01(const EVP_PKEY *a,const EVP_PKEY *b)
 765         {
 766         const EC_KEY *ea = EVP_PKEY_get0((EVP_PKEY *)a);
 767         const EC_KEY *eb = EVP_PKEY_get0((EVP_PKEY *)b);
 768         const EC_POINT *ka,*kb;
 769         int ret=0;
 770         if (!ea || !eb) return 0;
 771         ka = EC_KEY_get0_public_key(ea);
 772         kb = EC_KEY_get0_public_key(eb);
 773         if (!ka || !kb) return 0;
 774         ret = (0==EC_POINT_cmp(EC_KEY_get0_group(ea),ka,kb,NULL)) ;
 775         return ret;
 776         }
 777
 778
 779
 780
 781 static int pkey_size_gost(const EVP_PKEY *pk)
 782         {
 783         return 64;
 784         }
 785
 786 static int pkey_bits_gost(const EVP_PKEY *pk)
 787         {
 788         return 256;
 789         }
 790 /*------------------------ ASN1 METHOD for GOST MAC  -------------------*/
 791 static void  mackey_free_gost(EVP_PKEY *pk)
 792         {
 793                 if (pk->pkey.ptr) {
 794                         OPENSSL_free(pk->pkey.ptr);
 795                 }
 796         }
 797 static int mac_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 798 {
 799         switch (op)
 800                 {
 801                 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 802                         *(int *)arg2 = NID_id_Gost28147_89_MAC;
 803                         return 2;
 804                 }
 805         return -2;
 806 }
 807
 808 static int gost94_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 809 {
 810    int nid=gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)pkey));
 811    return i2d_ASN1_OBJECT(OBJ_nid2obj(nid),pder);
 812 }
 813 static int gost2001_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 814 {
 815    int nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)pkey)));
 816    return i2d_ASN1_OBJECT(OBJ_nid2obj(nid),pder);
 817 }
 818
 819 static int gost94_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
 820 {
 821         ASN1_OBJECT *obj=NULL;
 822         DSA *dsa = EVP_PKEY_get0(pkey);
 823         int nid;
 824         if (d2i_ASN1_OBJECT(&obj,pder,derlen)==NULL) {
 825                 return 0;
 826         }
 827         nid = OBJ_obj2nid(obj);
 828         ASN1_OBJECT_free(obj);
 829         if (!dsa)
 830                 {
 831                 dsa=DSA_new();
 832                 if (!EVP_PKEY_assign(pkey,NID_id_GostR3410_94,dsa)) return 0;
 833                 }
 834         if (!fill_GOST94_params(dsa,nid)) return 0;
 835         return 1;
 836 }
 837
 838 static int gost2001_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen) {
 839         ASN1_OBJECT *obj=NULL;
 840         int nid;
 841         EC_KEY *ec = EVP_PKEY_get0(pkey);
 842         if (d2i_ASN1_OBJECT(&obj,pder,derlen)==NULL) {
 843                 return 0;
 844         }
 845         nid = OBJ_obj2nid(obj);
 846         ASN1_OBJECT_free(obj);
 847         if (!ec)
 848                 {
 849                 ec = EC_KEY_new();
 850                 if (!EVP_PKEY_assign(pkey,NID_id_GostR3410_2001,ec)) return 0;
 851                 }
 852         if (!fill_GOST2001_params(ec, nid)) return 0;
 853         return 1;
 854 }
 855
 856
 857
 858
 859
 860 /* ----------------------------------------------------------------------*/
 861 int register_ameth_gost (int nid, EVP_PKEY_ASN1_METHOD **ameth, const char* pemstr, const char* info)
 862         {
 863         *ameth =        EVP_PKEY_asn1_new(nid,
 864                 ASN1_PKEY_SIGPARAM_NULL, pemstr, info);
 865         if (!*ameth) return 0;
 866         switch (nid)
 867                 {
 868                 case NID_id_GostR3410_94:
 869                         EVP_PKEY_asn1_set_free (*ameth, pkey_free_gost94);
 870                         EVP_PKEY_asn1_set_private (*ameth,
 871                                 priv_decode_gost, priv_encode_gost,
 872                                 priv_print_gost94);
 873
 874                         EVP_PKEY_asn1_set_param (*ameth,
 875                                 gost94_param_decode, gost94_param_encode,
 876                                 param_missing_gost94, param_copy_gost94,
 877                                 param_cmp_gost94,param_print_gost94 );
 878                         EVP_PKEY_asn1_set_public (*ameth,
 879                                 pub_decode_gost94, pub_encode_gost94,
 880                                 pub_cmp_gost94, pub_print_gost94,
 881                                 pkey_size_gost, pkey_bits_gost);
 882
 883                         EVP_PKEY_asn1_set_ctrl (*ameth, pkey_ctrl_gost);
 884                         break;
 885                 case NID_id_GostR3410_2001:
 886                         EVP_PKEY_asn1_set_free (*ameth, pkey_free_gost01);
 887                         EVP_PKEY_asn1_set_private (*ameth,
 888                                 priv_decode_gost, priv_encode_gost,
 889                                 priv_print_gost01);
 890
 891                         EVP_PKEY_asn1_set_param (*ameth,
 892                                 gost2001_param_decode, gost2001_param_encode,
 893                                 param_missing_gost01, param_copy_gost01,
 894                                 param_cmp_gost01, param_print_gost01);
 895                         EVP_PKEY_asn1_set_public (*ameth,
 896                                 pub_decode_gost01, pub_encode_gost01,
 897                                 pub_cmp_gost01, pub_print_gost01,
 898                                 pkey_size_gost, pkey_bits_gost);
 899
 900                         EVP_PKEY_asn1_set_ctrl (*ameth, pkey_ctrl_gost);
 901                         break;
 902                 case NID_id_Gost28147_89_MAC:
 903                         EVP_PKEY_asn1_set_free(*ameth, mackey_free_gost);
 904                         EVP_PKEY_asn1_set_ctrl(*ameth,mac_ctrl_gost);
 905                         break;
 906                 }
 907         return 1;
 908         }