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 #ifndef OPENSSL_NO_CMS
  17 # include <openssl/cms.h>
  18 #endif
  19 #include "gost_params.h"
  20 #include "gost_lcl.h"
  21 #include "e_gost_err.h"
  22
  23 int gost94_nid_by_params(DSA *p)
  24 {
  25     R3410_params *gost_params;
  26     BIGNUM *q = BN_new();
  27     for (gost_params = R3410_paramset; gost_params->q != NULL; gost_params++) {
  28         BN_dec2bn(&q, gost_params->q);
  29         if (!BN_cmp(q, p->q)) {
  30             BN_free(q);
  31             return gost_params->nid;
  32         }
  33     }
  34     BN_free(q);
  35     return NID_undef;
  36 }
  37
  38 static ASN1_STRING *encode_gost_algor_params(const EVP_PKEY *key)
  39 {
  40     ASN1_STRING *params = ASN1_STRING_new();
  41     GOST_KEY_PARAMS *gkp = GOST_KEY_PARAMS_new();
  42     int pkey_param_nid = NID_undef;
  43
  44     if (!params || !gkp) {
  45         GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
  46         ASN1_STRING_free(params);
  47         params = NULL;
  48         goto err;
  49     }
  50     switch (EVP_PKEY_base_id(key)) {
  51     case NID_id_GostR3410_2001:
  52         pkey_param_nid =
  53             EC_GROUP_get_curve_name(EC_KEY_get0_group
  54                                     (EVP_PKEY_get0((EVP_PKEY *)key)));
  55         break;
  56     case NID_id_GostR3410_94:
  57         pkey_param_nid =
  58             (int)gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)key));
  59         if (pkey_param_nid == NID_undef) {
  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     /*
  71      * gkp->cipher_params = OBJ_nid2obj(cipher_param_nid);
  72      */
  73     params->length = i2d_GOST_KEY_PARAMS(gkp, &params->data);
  74     if (params->length <= 0) {
  75         GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, 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 /*
  87  * Parses GOST algorithm parameters from X509_ALGOR and modifies pkey setting
  88  * NID and parameters
  89  */
  90 static int decode_gost_algor_params(EVP_PKEY *pkey, X509_ALGOR *palg)
  91 {
  92     ASN1_OBJECT *palg_obj = NULL;
  93     int ptype = V_ASN1_UNDEF;
  94     int pkey_nid = NID_undef, param_nid = NID_undef;
  95     void *_pval;
  96     ASN1_STRING *pval = NULL;
  97     const unsigned char *p;
  98     GOST_KEY_PARAMS *gkp = NULL;
  99
 100     X509_ALGOR_get0(&palg_obj, &ptype, &_pval, palg);
 101     pval = _pval;
 102     if (ptype != V_ASN1_SEQUENCE) {
 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         GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
 113                 GOST_R_BAD_PKEY_PARAMETERS_FORMAT);
 114         return 0;
 115     }
 116     param_nid = OBJ_obj2nid(gkp->key_params);
 117     GOST_KEY_PARAMS_free(gkp);
 118     if (!EVP_PKEY_set_type(pkey, pkey_nid)) {
 119         GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS, ERR_R_INTERNAL_ERROR);
 120         return 0;
 121     }
 122     switch (pkey_nid) {
 123     case NID_id_GostR3410_94:
 124         {
 125             DSA *dsa = EVP_PKEY_get0(pkey);
 126             if (!dsa) {
 127                 dsa = DSA_new();
 128                 if (!EVP_PKEY_assign(pkey, pkey_nid, dsa))
 129                     return 0;
 130             }
 131             if (!fill_GOST94_params(dsa, param_nid))
 132                 return 0;
 133             break;
 134         }
 135     case NID_id_GostR3410_2001:
 136         {
 137             EC_KEY *ec = EVP_PKEY_get0(pkey);
 138             if (!ec) {
 139                 ec = EC_KEY_new();
 140                 if (!EVP_PKEY_assign(pkey, pkey_nid, ec))
 141                     return 0;
 142             }
 143             if (!fill_GOST2001_params(ec, param_nid))
 144                 return 0;
 145         }
 146     }
 147
 148     return 1;
 149 }
 150
 151 static int gost_set_priv_key(EVP_PKEY *pkey, BIGNUM *priv)
 152 {
 153     switch (EVP_PKEY_base_id(pkey)) {
 154     case NID_id_GostR3410_94:
 155         {
 156             DSA *dsa = EVP_PKEY_get0(pkey);
 157             if (!dsa) {
 158                 dsa = DSA_new();
 159                 EVP_PKEY_assign(pkey, EVP_PKEY_base_id(pkey), dsa);
 160             }
 161             dsa->priv_key = BN_dup(priv);
 162             if (!EVP_PKEY_missing_parameters(pkey))
 163                 gost94_compute_public(dsa);
 164             break;
 165         }
 166     case NID_id_GostR3410_2001:
 167         {
 168             EC_KEY *ec = EVP_PKEY_get0(pkey);
 169             if (!ec) {
 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))
 174                 return 0;
 175             if (!EVP_PKEY_missing_parameters(pkey))
 176                 gost2001_compute_public(ec);
 177             break;
 178         }
 179     }
 180     return 1;
 181 }
 182
 183 BIGNUM *gost_get0_priv_key(const EVP_PKEY *pkey)
 184 {
 185     switch (EVP_PKEY_base_id(pkey)) {
 186     case NID_id_GostR3410_94:
 187         {
 188             DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pkey);
 189             if (!dsa) {
 190                 return NULL;
 191             }
 192             if (!dsa->priv_key)
 193                 return NULL;
 194             return dsa->priv_key;
 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                 return NULL;
 202             }
 203             if (!(priv = EC_KEY_get0_private_key(ec)))
 204                 return NULL;
 205             return (BIGNUM *)priv;
 206         }
 207     }
 208     return NULL;
 209 }
 210
 211 static int pkey_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 212 {
 213     switch (op) {
 214     case ASN1_PKEY_CTRL_PKCS7_SIGN:
 215         if (arg1 == 0) {
 216             X509_ALGOR *alg1 = NULL, *alg2 = NULL;
 217             int nid = EVP_PKEY_base_id(pkey);
 218             PKCS7_SIGNER_INFO_get0_algs((PKCS7_SIGNER_INFO *)arg2,
 219                                         NULL, &alg1, &alg2);
 220             X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
 221                             V_ASN1_NULL, 0);
 222             if (nid == NID_undef) {
 223                 return (-1);
 224             }
 225             X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
 226         }
 227         return 1;
 228 #ifndef OPENSSL_NO_CMS
 229     case ASN1_PKEY_CTRL_CMS_SIGN:
 230         if (arg1 == 0) {
 231             X509_ALGOR *alg1 = NULL, *alg2 = NULL;
 232             int nid = EVP_PKEY_base_id(pkey);
 233             CMS_SignerInfo_get0_algs((CMS_SignerInfo *)arg2,
 234                                      NULL, NULL, &alg1, &alg2);
 235             X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
 236                             V_ASN1_NULL, 0);
 237             if (nid == NID_undef) {
 238                 return (-1);
 239             }
 240             X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
 241         }
 242         return 1;
 243 #endif
 244     case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
 245         if (arg1 == 0) {
 246             X509_ALGOR *alg;
 247             ASN1_STRING *params = encode_gost_algor_params(pkey);
 248             if (!params) {
 249                 return -1;
 250             }
 251             PKCS7_RECIP_INFO_get0_alg((PKCS7_RECIP_INFO *)arg2, &alg);
 252             X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type),
 253                             V_ASN1_SEQUENCE, params);
 254         }
 255         return 1;
 256 #ifndef OPENSSL_NO_CMS
 257     case ASN1_PKEY_CTRL_CMS_ENVELOPE:
 258         if (arg1 == 0) {
 259             X509_ALGOR *alg = NULL;
 260             ASN1_STRING *params = encode_gost_algor_params(pkey);
 261             if (!params) {
 262                 return -1;
 263             }
 264             CMS_RecipientInfo_ktri_get0_algs((CMS_RecipientInfo *)arg2, NULL,
 265                                              NULL, &alg);
 266             X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type), V_ASN1_SEQUENCE,
 267                             params);
 268         }
 269         return 1;
 270 #endif
 271     case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 272         *(int *)arg2 = NID_id_GostR3411_94;
 273         return 2;
 274     }
 275
 276     return -2;
 277 }
 278
 279 /* --------------------- free functions * ------------------------------*/
 280 static void pkey_free_gost94(EVP_PKEY *key)
 281 {
 282     DSA_free(key->pkey.dsa);
 283 }
 284
 285 static void pkey_free_gost01(EVP_PKEY *key)
 286 {
 287     EC_KEY_free(key->pkey.ec);
 288 }
 289
 290 /* ------------------ private key functions  -----------------------------*/
 291 static int priv_decode_gost(EVP_PKEY *pk, PKCS8_PRIV_KEY_INFO *p8inf)
 292 {
 293     const unsigned char *pkey_buf = NULL, *p = NULL;
 294     int priv_len = 0;
 295     BIGNUM *pk_num = NULL;
 296     int ret = 0;
 297     X509_ALGOR *palg = NULL;
 298     ASN1_OBJECT *palg_obj = NULL;
 299     ASN1_INTEGER *priv_key = NULL;
 300
 301     if (!PKCS8_pkey_get0(&palg_obj, &pkey_buf, &priv_len, &palg, p8inf))
 302         return 0;
 303     p = pkey_buf;
 304     if (!decode_gost_algor_params(pk, palg)) {
 305         return 0;
 306     }
 307     if (V_ASN1_OCTET_STRING == *p) {
 308         /* New format - Little endian octet string */
 309         unsigned char rev_buf[32];
 310         int i;
 311         ASN1_OCTET_STRING *s = d2i_ASN1_OCTET_STRING(NULL, &p, priv_len);
 312         if (!s || s->length != 32) {
 313             GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
 314             return 0;
 315         }
 316         for (i = 0; i < 32; i++) {
 317             rev_buf[31 - i] = s->data[i];
 318         }
 319         ASN1_STRING_free(s);
 320         pk_num = getbnfrombuf(rev_buf, 32);
 321     } else {
 322         priv_key = d2i_ASN1_INTEGER(NULL, &p, priv_len);
 323         if (!priv_key)
 324             return 0;
 325         ret = ((pk_num = ASN1_INTEGER_to_BN(priv_key, NULL)) != NULL);
 326         ASN1_INTEGER_free(priv_key);
 327         if (!ret) {
 328             GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
 329             return 0;
 330         }
 331     }
 332
 333     ret = gost_set_priv_key(pk, pk_num);
 334     BN_free(pk_num);
 335     return ret;
 336 }
 337
 338 /* ----------------------------------------------------------------------*/
 339 static int priv_encode_gost(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk)
 340 {
 341     ASN1_OBJECT *algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
 342     ASN1_STRING *params = encode_gost_algor_params(pk);
 343     unsigned char *priv_buf = NULL;
 344     int priv_len;
 345
 346     ASN1_INTEGER *asn1key = NULL;
 347     if (!params) {
 348         return 0;
 349     }
 350     asn1key = BN_to_ASN1_INTEGER(gost_get0_priv_key(pk), NULL);
 351     priv_len = i2d_ASN1_INTEGER(asn1key, &priv_buf);
 352     ASN1_INTEGER_free(asn1key);
 353     return PKCS8_pkey_set0(p8, algobj, 0, V_ASN1_SEQUENCE, params,
 354                            priv_buf, priv_len);
 355 }
 356
 357 /* --------- printing keys --------------------------------*/
 358 static int print_gost_94(BIO *out, const EVP_PKEY *pkey, int indent,
 359                          ASN1_PCTX *pctx, int type)
 360 {
 361     int param_nid = NID_undef;
 362
 363     if (type == 2) {
 364         BIGNUM *key;
 365
 366         if (!BIO_indent(out, indent, 128))
 367             return 0;
 368         BIO_printf(out, "Private key: ");
 369         key = gost_get0_priv_key(pkey);
 370         if (!key)
 371             BIO_printf(out, "<undefined>");
 372         else
 373             BN_print(out, key);
 374         BIO_printf(out, "\n");
 375     }
 376     if (type >= 1) {
 377         BIGNUM *pubkey;
 378
 379         pubkey = ((DSA *)EVP_PKEY_get0((EVP_PKEY *)pkey))->pub_key;
 380         BIO_indent(out, indent, 128);
 381         BIO_printf(out, "Public key: ");
 382         BN_print(out, pubkey);
 383         BIO_printf(out, "\n");
 384     }
 385
 386     param_nid = gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)pkey));
 387     BIO_indent(out, indent, 128);
 388     BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
 389     return 1;
 390 }
 391
 392 static int param_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
 393                               ASN1_PCTX *pctx)
 394 {
 395     return print_gost_94(out, pkey, indent, pctx, 0);
 396 }
 397
 398 static int pub_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
 399                             ASN1_PCTX *pctx)
 400 {
 401     return print_gost_94(out, pkey, indent, pctx, 1);
 402 }
 403
 404 static int priv_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
 405                              ASN1_PCTX *pctx)
 406 {
 407     return print_gost_94(out, pkey, indent, pctx, 2);
 408 }
 409
 410 static int print_gost_01(BIO *out, const EVP_PKEY *pkey, int indent,
 411                          ASN1_PCTX *pctx, int type)
 412 {
 413     int param_nid = NID_undef;
 414     if (type == 2) {
 415         BIGNUM *key;
 416
 417         if (!BIO_indent(out, indent, 128))
 418             return 0;
 419         BIO_printf(out, "Private key: ");
 420         key = gost_get0_priv_key(pkey);
 421         if (!key)
 422             BIO_printf(out, "<undefined)");
 423         else
 424             BN_print(out, key);
 425         BIO_printf(out, "\n");
 426     }
 427     if (type >= 1) {
 428         BN_CTX *ctx = BN_CTX_new();
 429         BIGNUM *X, *Y;
 430         const EC_POINT *pubkey;
 431         const EC_GROUP *group;
 432
 433         if (!ctx) {
 434             GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_MALLOC_FAILURE);
 435             return 0;
 436         }
 437         BN_CTX_start(ctx);
 438         X = BN_CTX_get(ctx);
 439         Y = BN_CTX_get(ctx);
 440         pubkey =
 441             EC_KEY_get0_public_key((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
 442         group = EC_KEY_get0_group((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
 443         if (!EC_POINT_get_affine_coordinates_GFp(group, pubkey, X, Y, ctx)) {
 444             GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_EC_LIB);
 445             BN_CTX_free(ctx);
 446             return 0;
 447         }
 448         if (!BIO_indent(out, indent, 128))
 449             return 0;
 450         BIO_printf(out, "Public key:\n");
 451         if (!BIO_indent(out, indent + 3, 128))
 452             return 0;
 453         BIO_printf(out, "X:");
 454         BN_print(out, X);
 455         BIO_printf(out, "\n");
 456         BIO_indent(out, indent + 3, 128);
 457         BIO_printf(out, "Y:");
 458         BN_print(out, Y);
 459         BIO_printf(out, "\n");
 460         BN_CTX_end(ctx);
 461         BN_CTX_free(ctx);
 462     }
 463
 464     param_nid =
 465         EC_GROUP_get_curve_name(EC_KEY_get0_group
 466                                 (EVP_PKEY_get0((EVP_PKEY *)pkey)));
 467     if (!BIO_indent(out, indent, 128))
 468         return 0;
 469     BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
 470     return 1;
 471 }
 472
 473 static int param_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
 474                               ASN1_PCTX *pctx)
 475 {
 476     return print_gost_01(out, pkey, indent, pctx, 0);
 477 }
 478
 479 static int pub_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
 480                             ASN1_PCTX *pctx)
 481 {
 482     return print_gost_01(out, pkey, indent, pctx, 1);
 483 }
 484
 485 static int priv_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
 486                              ASN1_PCTX *pctx)
 487 {
 488     return print_gost_01(out, pkey, indent, pctx, 2);
 489 }
 490
 491 /* ---------------------------------------------------------------------*/
 492 static int param_missing_gost94(const EVP_PKEY *pk)
 493 {
 494     const DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pk);
 495     if (!dsa)
 496         return 1;
 497     if (!dsa->q)
 498         return 1;
 499     return 0;
 500 }
 501
 502 static int param_missing_gost01(const EVP_PKEY *pk)
 503 {
 504     const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
 505     if (!ec)
 506         return 1;
 507     if (!EC_KEY_get0_group(ec))
 508         return 1;
 509     return 0;
 510 }
 511
 512 static int param_copy_gost94(EVP_PKEY *to, const EVP_PKEY *from)
 513 {
 514     const DSA *dfrom = EVP_PKEY_get0((EVP_PKEY *)from);
 515     DSA *dto = EVP_PKEY_get0(to);
 516     if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to)) {
 517         GOSTerr(GOST_F_PARAM_COPY_GOST94, GOST_R_INCOMPATIBLE_ALGORITHMS);
 518         return 0;
 519     }
 520     if (!dfrom) {
 521         GOSTerr(GOST_F_PARAM_COPY_GOST94, GOST_R_KEY_PARAMETERS_MISSING);
 522         return 0;
 523     }
 524     if (!dto) {
 525         dto = DSA_new();
 526         EVP_PKEY_assign(to, EVP_PKEY_base_id(from), dto);
 527     }
 528     BN_free(dto->p);
 529     dto->p = BN_dup(dfrom->p);
 530     BN_free(dto->q);
 531     dto->q = BN_dup(dfrom->q);
 532     BN_free(dto->g);
 533     dto->g = BN_dup(dfrom->g);
 534
 535     if (dto->priv_key)
 536         gost94_compute_public(dto);
 537     return 1;
 538 }
 539
 540 static int param_copy_gost01(EVP_PKEY *to, const EVP_PKEY *from)
 541 {
 542     EC_KEY *eto = EVP_PKEY_get0(to);
 543     const EC_KEY *efrom = EVP_PKEY_get0((EVP_PKEY *)from);
 544     if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to)) {
 545         GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_INCOMPATIBLE_ALGORITHMS);
 546         return 0;
 547     }
 548     if (!efrom) {
 549         GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_KEY_PARAMETERS_MISSING);
 550         return 0;
 551     }
 552     if (!eto) {
 553         eto = EC_KEY_new();
 554         if (!eto) {
 555             GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_MALLOC_FAILURE);
 556             return 0;
 557         }
 558         if (!EVP_PKEY_assign(to, EVP_PKEY_base_id(from), eto)) {
 559             GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_INTERNAL_ERROR);
 560             return 0;
 561         }
 562     }
 563     if (!EC_KEY_set_group(eto, EC_KEY_get0_group(efrom))) {
 564         GOSTerr(GOST_F_PARAM_COPY_GOST01, ERR_R_INTERNAL_ERROR);
 565         return 0;
 566     }
 567     if (EC_KEY_get0_private_key(eto)) {
 568         gost2001_compute_public(eto);
 569     }
 570     return 1;
 571 }
 572
 573 static int param_cmp_gost94(const EVP_PKEY *a, const EVP_PKEY *b)
 574 {
 575     const DSA *da = EVP_PKEY_get0((EVP_PKEY *)a);
 576     const DSA *db = EVP_PKEY_get0((EVP_PKEY *)b);
 577     if (!BN_cmp(da->q, db->q))
 578         return 1;
 579     return 0;
 580 }
 581
 582 static int param_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
 583 {
 584     if (EC_GROUP_get_curve_name
 585         (EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)a))) ==
 586         EC_GROUP_get_curve_name(EC_KEY_get0_group
 587                                 (EVP_PKEY_get0((EVP_PKEY *)b)))) {
 588         return 1;
 589     }
 590     return 0;
 591
 592 }
 593
 594 /* ---------- Public key functions * --------------------------------------*/
 595 static int pub_decode_gost94(EVP_PKEY *pk, X509_PUBKEY *pub)
 596 {
 597     X509_ALGOR *palg = NULL;
 598     const unsigned char *pubkey_buf = NULL;
 599     unsigned char *databuf;
 600     ASN1_OBJECT *palgobj = NULL;
 601     int pub_len, i, j;
 602     DSA *dsa;
 603     ASN1_OCTET_STRING *octet = NULL;
 604
 605     if (!X509_PUBKEY_get0_param(&palgobj, &pubkey_buf, &pub_len, &palg, pub))
 606         return 0;
 607     EVP_PKEY_assign(pk, OBJ_obj2nid(palgobj), NULL);
 608     if (!decode_gost_algor_params(pk, palg))
 609         return 0;
 610     octet = d2i_ASN1_OCTET_STRING(NULL, &pubkey_buf, pub_len);
 611     if (!octet) {
 612         GOSTerr(GOST_F_PUB_DECODE_GOST94, ERR_R_MALLOC_FAILURE);
 613         return 0;
 614     }
 615     databuf = OPENSSL_malloc(octet->length);
 616     if (databuf == NULL) {
 617         GOSTerr(GOST_F_PUB_DECODE_GOST94, ERR_R_MALLOC_FAILURE);
 618         ASN1_OCTET_STRING_free(octet);
 619         return 0;
 620     }
 621     for (i = 0, j = octet->length - 1; i < octet->length; i++, j--) {
 622         databuf[j] = octet->data[i];
 623     }
 624     dsa = EVP_PKEY_get0(pk);
 625     dsa->pub_key = BN_bin2bn(databuf, octet->length, NULL);
 626     ASN1_OCTET_STRING_free(octet);
 627     OPENSSL_free(databuf);
 628     return 1;
 629
 630 }
 631
 632 static int pub_encode_gost94(X509_PUBKEY *pub, const EVP_PKEY *pk)
 633 {
 634     ASN1_OBJECT *algobj = NULL;
 635     ASN1_OCTET_STRING *octet = NULL;
 636     void *pval = NULL;
 637     unsigned char *buf = NULL, *databuf, *sptr;
 638     int i, j, data_len, ret = 0;
 639
 640     int ptype = V_ASN1_UNDEF;
 641     DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pk);
 642     algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
 643     if (pk->save_parameters) {
 644         ASN1_STRING *params = encode_gost_algor_params(pk);
 645         pval = params;
 646         ptype = V_ASN1_SEQUENCE;
 647     }
 648     data_len = BN_num_bytes(dsa->pub_key);
 649     databuf = OPENSSL_malloc(data_len);
 650     if (databuf == NULL) {
 651         GOSTerr(GOST_F_PUB_ENCODE_GOST94, ERR_R_MALLOC_FAILURE);
 652         return 0;
 653     }
 654     BN_bn2bin(dsa->pub_key, databuf);
 655     octet = ASN1_OCTET_STRING_new();
 656     if (octet == NULL) {
 657         GOSTerr(GOST_F_PUB_ENCODE_GOST94, ERR_R_MALLOC_FAILURE);
 658         OPENSSL_free(databuf);
 659         return 0;
 660     }
 661     ASN1_STRING_set(octet, NULL, data_len);
 662     sptr = ASN1_STRING_data(octet);
 663     for (i = 0, j = data_len - 1; i < data_len; i++, j--) {
 664         sptr[i] = databuf[j];
 665     }
 666     OPENSSL_free(databuf);
 667     ret = i2d_ASN1_OCTET_STRING(octet, &buf);
 668     ASN1_BIT_STRING_free(octet);
 669     if (ret < 0)
 670         return 0;
 671     return X509_PUBKEY_set0_param(pub, algobj, ptype, pval, buf, ret);
 672 }
 673
 674 static int pub_decode_gost01(EVP_PKEY *pk, X509_PUBKEY *pub)
 675 {
 676     X509_ALGOR *palg = NULL;
 677     const unsigned char *pubkey_buf = NULL;
 678     unsigned char *databuf;
 679     ASN1_OBJECT *palgobj = NULL;
 680     int pub_len, i, j;
 681     EC_POINT *pub_key;
 682     BIGNUM *X, *Y;
 683     ASN1_OCTET_STRING *octet = NULL;
 684     int len;
 685     const EC_GROUP *group;
 686
 687     if (!X509_PUBKEY_get0_param(&palgobj, &pubkey_buf, &pub_len, &palg, pub))
 688         return 0;
 689     EVP_PKEY_assign(pk, OBJ_obj2nid(palgobj), NULL);
 690     if (!decode_gost_algor_params(pk, palg))
 691         return 0;
 692     group = EC_KEY_get0_group(EVP_PKEY_get0(pk));
 693     octet = d2i_ASN1_OCTET_STRING(NULL, &pubkey_buf, pub_len);
 694     if (!octet) {
 695         GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
 696         return 0;
 697     }
 698     databuf = OPENSSL_malloc(octet->length);
 699     if (databuf == NULL) {
 700         GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
 701         ASN1_OCTET_STRING_free(octet);
 702         return 0;
 703     }
 704     for (i = 0, j = octet->length - 1; i < octet->length; i++, j--) {
 705         databuf[j] = octet->data[i];
 706     }
 707     len = octet->length / 2;
 708     ASN1_OCTET_STRING_free(octet);
 709
 710     Y = getbnfrombuf(databuf, len);
 711     X = getbnfrombuf(databuf + len, len);
 712     OPENSSL_free(databuf);
 713     pub_key = EC_POINT_new(group);
 714     if (!EC_POINT_set_affine_coordinates_GFp(group, pub_key, X, Y, NULL)) {
 715         GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
 716         EC_POINT_free(pub_key);
 717         BN_free(X);
 718         BN_free(Y);
 719         return 0;
 720     }
 721     BN_free(X);
 722     BN_free(Y);
 723     if (!EC_KEY_set_public_key(EVP_PKEY_get0(pk), pub_key)) {
 724         GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
 725         EC_POINT_free(pub_key);
 726         return 0;
 727     }
 728     EC_POINT_free(pub_key);
 729     return 1;
 730
 731 }
 732
 733 static int pub_encode_gost01(X509_PUBKEY *pub, const EVP_PKEY *pk)
 734 {
 735     ASN1_OBJECT *algobj = NULL;
 736     ASN1_OCTET_STRING *octet = NULL;
 737     void *pval = NULL;
 738     unsigned char *buf = NULL, *databuf, *sptr;
 739     int i, j, data_len, ret = 0;
 740     const EC_POINT *pub_key;
 741     BIGNUM *X, *Y, *order;
 742     const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
 743     int ptype = V_ASN1_UNDEF;
 744
 745     algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
 746     if (pk->save_parameters) {
 747         ASN1_STRING *params = encode_gost_algor_params(pk);
 748         pval = params;
 749         ptype = V_ASN1_SEQUENCE;
 750     }
 751     order = BN_new();
 752     EC_GROUP_get_order(EC_KEY_get0_group(ec), order, NULL);
 753     pub_key = EC_KEY_get0_public_key(ec);
 754     if (!pub_key) {
 755         GOSTerr(GOST_F_PUB_ENCODE_GOST01, GOST_R_PUBLIC_KEY_UNDEFINED);
 756         BN_free(order);
 757         return 0;
 758     }
 759     X = BN_new();
 760     Y = BN_new();
 761     if (!X || !Y) {
 762         GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
 763         BN_free(X);
 764         BN_free(Y);
 765         BN_free(order);
 766         return 0;
 767     }
 768     if (!EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(ec),
 769                                         pub_key, X, Y, NULL)) {
 770         GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_INTERNAL_ERROR);
 771         BN_free(X);
 772         BN_free(Y);
 773         BN_free(order);
 774         return 0;
 775     }
 776     data_len = 2 * BN_num_bytes(order);
 777     BN_free(order);
 778     databuf = OPENSSL_malloc(data_len);
 779     if (databuf == NULL) {
 780         GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
 781         BN_free(X);
 782         BN_free(Y);
 783         return 0;
 784     }
 785     memset(databuf, 0, data_len);
 786
 787     store_bignum(X, databuf + data_len / 2, data_len / 2);
 788     store_bignum(Y, databuf, data_len / 2);
 789
 790     BN_free(X);
 791     BN_free(Y);
 792     octet = ASN1_OCTET_STRING_new();
 793     if (octet == NULL) {
 794         GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
 795         OPENSSL_free(databuf);
 796         return 0;
 797     }
 798     ASN1_STRING_set(octet, NULL, data_len);
 799     sptr = ASN1_STRING_data(octet);
 800     for (i = 0, j = data_len - 1; i < data_len; i++, j--) {
 801         sptr[i] = databuf[j];
 802     }
 803     OPENSSL_free(databuf);
 804     ret = i2d_ASN1_OCTET_STRING(octet, &buf);
 805     ASN1_BIT_STRING_free(octet);
 806     if (ret < 0)
 807         return 0;
 808     return X509_PUBKEY_set0_param(pub, algobj, ptype, pval, buf, ret);
 809 }
 810
 811 static int pub_cmp_gost94(const EVP_PKEY *a, const EVP_PKEY *b)
 812 {
 813     const DSA *da = EVP_PKEY_get0((EVP_PKEY *)a);
 814     const DSA *db = EVP_PKEY_get0((EVP_PKEY *)b);
 815     if (da && db && da->pub_key && db->pub_key
 816         && !BN_cmp(da->pub_key, db->pub_key)) {
 817         return 1;
 818     }
 819     return 0;
 820 }
 821
 822 static int pub_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
 823 {
 824     const EC_KEY *ea = EVP_PKEY_get0((EVP_PKEY *)a);
 825     const EC_KEY *eb = EVP_PKEY_get0((EVP_PKEY *)b);
 826     const EC_POINT *ka, *kb;
 827     int ret = 0;
 828     if (!ea || !eb)
 829         return 0;
 830     ka = EC_KEY_get0_public_key(ea);
 831     kb = EC_KEY_get0_public_key(eb);
 832     if (!ka || !kb)
 833         return 0;
 834     ret = (0 == EC_POINT_cmp(EC_KEY_get0_group(ea), ka, kb, NULL));
 835     return ret;
 836 }
 837
 838 static int pkey_size_gost(const EVP_PKEY *pk)
 839 {
 840     return 64;
 841 }
 842
 843 static int pkey_bits_gost(const EVP_PKEY *pk)
 844 {
 845     return 256;
 846 }
 847
 848 /* ---------------------- ASN1 METHOD for GOST MAC  -------------------*/
 849 static void mackey_free_gost(EVP_PKEY *pk)
 850 {
 851     if (pk->pkey.ptr) {
 852         OPENSSL_free(pk->pkey.ptr);
 853     }
 854 }
 855
 856 static int mac_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 857 {
 858     switch (op) {
 859     case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 860         *(int *)arg2 = NID_id_Gost28147_89_MAC;
 861         return 2;
 862     }
 863     return -2;
 864 }
 865
 866 static int gost94_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 867 {
 868     int nid = gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)pkey));
 869     return i2d_ASN1_OBJECT(OBJ_nid2obj(nid), pder);
 870 }
 871
 872 static int gost2001_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 873 {
 874     int nid =
 875         EC_GROUP_get_curve_name(EC_KEY_get0_group
 876                                 (EVP_PKEY_get0((EVP_PKEY *)pkey)));
 877     return i2d_ASN1_OBJECT(OBJ_nid2obj(nid), pder);
 878 }
 879
 880 static int gost94_param_decode(EVP_PKEY *pkey, const unsigned char **pder,
 881                                int derlen)
 882 {
 883     ASN1_OBJECT *obj = NULL;
 884     DSA *dsa = EVP_PKEY_get0(pkey);
 885     int nid;
 886     if (d2i_ASN1_OBJECT(&obj, pder, derlen) == NULL) {
 887         return 0;
 888     }
 889     nid = OBJ_obj2nid(obj);
 890     ASN1_OBJECT_free(obj);
 891     if (!dsa) {
 892         dsa = DSA_new();
 893         if (!EVP_PKEY_assign(pkey, NID_id_GostR3410_94, dsa))
 894             return 0;
 895     }
 896     if (!fill_GOST94_params(dsa, nid))
 897         return 0;
 898     return 1;
 899 }
 900
 901 static int gost2001_param_decode(EVP_PKEY *pkey, const unsigned char **pder,
 902                                  int derlen)
 903 {
 904     ASN1_OBJECT *obj = NULL;
 905     int nid;
 906     EC_KEY *ec = EVP_PKEY_get0(pkey);
 907     if (d2i_ASN1_OBJECT(&obj, pder, derlen) == NULL) {
 908         return 0;
 909     }
 910     nid = OBJ_obj2nid(obj);
 911     ASN1_OBJECT_free(obj);
 912     if (!ec) {
 913         ec = EC_KEY_new();
 914         if (!EVP_PKEY_assign(pkey, NID_id_GostR3410_2001, ec))
 915             return 0;
 916     }
 917     if (!fill_GOST2001_params(ec, nid))
 918         return 0;
 919     return 1;
 920 }
 921
 922 /* ----------------------------------------------------------------------*/
 923 int register_ameth_gost(int nid, EVP_PKEY_ASN1_METHOD **ameth,
 924                         const char *pemstr, const char *info)
 925 {
 926     *ameth = EVP_PKEY_asn1_new(nid, ASN1_PKEY_SIGPARAM_NULL, pemstr, info);
 927     if (!*ameth)
 928         return 0;
 929     switch (nid) {
 930     case NID_id_GostR3410_94:
 931         EVP_PKEY_asn1_set_free(*ameth, pkey_free_gost94);
 932         EVP_PKEY_asn1_set_private(*ameth,
 933                                   priv_decode_gost, priv_encode_gost,
 934                                   priv_print_gost94);
 935
 936         EVP_PKEY_asn1_set_param(*ameth,
 937                                 gost94_param_decode, gost94_param_encode,
 938                                 param_missing_gost94, param_copy_gost94,
 939                                 param_cmp_gost94, param_print_gost94);
 940         EVP_PKEY_asn1_set_public(*ameth,
 941                                  pub_decode_gost94, pub_encode_gost94,
 942                                  pub_cmp_gost94, pub_print_gost94,
 943                                  pkey_size_gost, pkey_bits_gost);
 944
 945         EVP_PKEY_asn1_set_ctrl(*ameth, pkey_ctrl_gost);
 946         break;
 947     case NID_id_GostR3410_2001:
 948         EVP_PKEY_asn1_set_free(*ameth, pkey_free_gost01);
 949         EVP_PKEY_asn1_set_private(*ameth,
 950                                   priv_decode_gost, priv_encode_gost,
 951                                   priv_print_gost01);
 952
 953         EVP_PKEY_asn1_set_param(*ameth,
 954                                 gost2001_param_decode, gost2001_param_encode,
 955                                 param_missing_gost01, param_copy_gost01,
 956                                 param_cmp_gost01, param_print_gost01);
 957         EVP_PKEY_asn1_set_public(*ameth,
 958                                  pub_decode_gost01, pub_encode_gost01,
 959                                  pub_cmp_gost01, pub_print_gost01,
 960                                  pkey_size_gost, pkey_bits_gost);
 961
 962         EVP_PKEY_asn1_set_ctrl(*ameth, pkey_ctrl_gost);
 963         break;
 964     case NID_id_Gost28147_89_MAC:
 965         EVP_PKEY_asn1_set_free(*ameth, mackey_free_gost);
 966         EVP_PKEY_asn1_set_ctrl(*ameth, mac_ctrl_gost);
 967         break;
 968     }
 969     return 1;
 970 }