Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/ec/ec_asn1.c */ |
| 2 | /* |
| 3 | * Written by Nils Larsch for the OpenSSL project. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 2000-2003 The OpenSSL Project. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in |
| 17 | * the documentation and/or other materials provided with the |
| 18 | * distribution. |
| 19 | * |
| 20 | * 3. All advertising materials mentioning features or use of this |
| 21 | * software must display the following acknowledgment: |
| 22 | * "This product includes software developed by the OpenSSL Project |
| 23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 24 | * |
| 25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 26 | * endorse or promote products derived from this software without |
| 27 | * prior written permission. For written permission, please contact |
| 28 | * licensing@OpenSSL.org. |
| 29 | * |
| 30 | * 5. Products derived from this software may not be called "OpenSSL" |
| 31 | * nor may "OpenSSL" appear in their names without prior written |
| 32 | * permission of the OpenSSL Project. |
| 33 | * |
| 34 | * 6. Redistributions of any form whatsoever must retain the following |
| 35 | * acknowledgment: |
| 36 | * "This product includes software developed by the OpenSSL Project |
| 37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 38 | * |
| 39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 50 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 51 | * ==================================================================== |
| 52 | * |
| 53 | * This product includes cryptographic software written by Eric Young |
| 54 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@cryptsoft.com). |
| 56 | * |
| 57 | */ |
| 58 | |
| 59 | #include <string.h> |
| 60 | #include "ec_lcl.h" |
| 61 | #include <openssl/err.h> |
| 62 | #include <openssl/asn1t.h> |
| 63 | #include <openssl/objects.h> |
| 64 | |
| 65 | |
| 66 | int EC_GROUP_get_basis_type(const EC_GROUP *group) |
| 67 | { |
| 68 | int i=0; |
| 69 | |
| 70 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
| 71 | NID_X9_62_characteristic_two_field) |
| 72 | /* everything else is currently not supported */ |
| 73 | return 0; |
| 74 | |
| 75 | while (group->poly[i] != 0) |
| 76 | i++; |
| 77 | |
| 78 | if (i == 4) |
| 79 | return NID_X9_62_ppBasis; |
| 80 | else if (i == 2) |
| 81 | return NID_X9_62_tpBasis; |
| 82 | else |
| 83 | /* everything else is currently not supported */ |
| 84 | return 0; |
| 85 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 86 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 87 | int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k) |
| 88 | { |
| 89 | if (group == NULL) |
| 90 | return 0; |
| 91 | |
| 92 | if (EC_GROUP_method_of(group)->group_set_curve != ec_GF2m_simple_group_set_curve |
| 93 | || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] == 0))) |
| 94 | { |
| 95 | ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | if (k) |
| 100 | *k = group->poly[1]; |
| 101 | |
| 102 | return 1; |
| 103 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 104 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 105 | int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1, |
| 106 | unsigned int *k2, unsigned int *k3) |
| 107 | { |
| 108 | if (group == NULL) |
| 109 | return 0; |
| 110 | |
| 111 | if (EC_GROUP_method_of(group)->group_set_curve != ec_GF2m_simple_group_set_curve |
| 112 | || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0))) |
| 113 | { |
| 114 | ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | if (k1) |
| 119 | *k1 = group->poly[3]; |
| 120 | if (k2) |
| 121 | *k2 = group->poly[2]; |
| 122 | if (k3) |
| 123 | *k3 = group->poly[1]; |
| 124 | |
| 125 | return 1; |
| 126 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 127 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 128 | |
| 129 | |
| 130 | /* some structures needed for the asn1 encoding */ |
| 131 | typedef struct x9_62_pentanomial_st { |
| 132 | long k1; |
| 133 | long k2; |
| 134 | long k3; |
| 135 | } X9_62_PENTANOMIAL; |
| 136 | |
| 137 | typedef struct x9_62_characteristic_two_st { |
| 138 | long m; |
| 139 | ASN1_OBJECT *type; |
| 140 | union { |
| 141 | char *ptr; |
| 142 | /* NID_X9_62_onBasis */ |
| 143 | ASN1_NULL *onBasis; |
| 144 | /* NID_X9_62_tpBasis */ |
| 145 | ASN1_INTEGER *tpBasis; |
| 146 | /* NID_X9_62_ppBasis */ |
| 147 | X9_62_PENTANOMIAL *ppBasis; |
| 148 | /* anything else */ |
| 149 | ASN1_TYPE *other; |
| 150 | } p; |
| 151 | } X9_62_CHARACTERISTIC_TWO; |
| 152 | |
| 153 | typedef struct x9_62_fieldid_st { |
| 154 | ASN1_OBJECT *fieldType; |
| 155 | union { |
| 156 | char *ptr; |
| 157 | /* NID_X9_62_prime_field */ |
| 158 | ASN1_INTEGER *prime; |
| 159 | /* NID_X9_62_characteristic_two_field */ |
| 160 | X9_62_CHARACTERISTIC_TWO *char_two; |
| 161 | /* anything else */ |
| 162 | ASN1_TYPE *other; |
| 163 | } p; |
| 164 | } X9_62_FIELDID; |
| 165 | |
| 166 | typedef struct x9_62_curve_st { |
| 167 | ASN1_OCTET_STRING *a; |
| 168 | ASN1_OCTET_STRING *b; |
| 169 | ASN1_BIT_STRING *seed; |
| 170 | } X9_62_CURVE; |
| 171 | |
| 172 | typedef struct ec_parameters_st { |
| 173 | long version; |
| 174 | X9_62_FIELDID *fieldID; |
| 175 | X9_62_CURVE *curve; |
| 176 | ASN1_OCTET_STRING *base; |
| 177 | ASN1_INTEGER *order; |
| 178 | ASN1_INTEGER *cofactor; |
| 179 | } ECPARAMETERS; |
| 180 | |
| 181 | struct ecpk_parameters_st { |
| 182 | int type; |
| 183 | union { |
| 184 | ASN1_OBJECT *named_curve; |
| 185 | ECPARAMETERS *parameters; |
| 186 | ASN1_NULL *implicitlyCA; |
| 187 | } value; |
| 188 | }/* ECPKPARAMETERS */; |
| 189 | |
| 190 | /* SEC1 ECPrivateKey */ |
| 191 | typedef struct ec_privatekey_st { |
| 192 | long version; |
| 193 | ASN1_OCTET_STRING *privateKey; |
| 194 | ECPKPARAMETERS *parameters; |
| 195 | ASN1_BIT_STRING *publicKey; |
| 196 | } EC_PRIVATEKEY; |
| 197 | |
| 198 | /* the OpenSSL ASN.1 definitions */ |
| 199 | ASN1_SEQUENCE(X9_62_PENTANOMIAL) = { |
| 200 | ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG), |
| 201 | ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG), |
| 202 | ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG) |
| 203 | } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL) |
| 204 | |
| 205 | DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL) |
| 206 | IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL) |
| 207 | |
| 208 | ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY); |
| 209 | |
| 210 | ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = { |
| 211 | ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)), |
| 212 | ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)), |
| 213 | ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL)) |
| 214 | } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL); |
| 215 | |
| 216 | ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = { |
| 217 | ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG), |
| 218 | ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT), |
| 219 | ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO) |
| 220 | } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO) |
| 221 | |
| 222 | DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO) |
| 223 | IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO) |
| 224 | |
| 225 | ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY); |
| 226 | |
| 227 | ASN1_ADB(X9_62_FIELDID) = { |
| 228 | ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)), |
| 229 | ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO)) |
| 230 | } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL); |
| 231 | |
| 232 | ASN1_SEQUENCE(X9_62_FIELDID) = { |
| 233 | ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT), |
| 234 | ASN1_ADB_OBJECT(X9_62_FIELDID) |
| 235 | } ASN1_SEQUENCE_END(X9_62_FIELDID) |
| 236 | |
| 237 | ASN1_SEQUENCE(X9_62_CURVE) = { |
| 238 | ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING), |
| 239 | ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING), |
| 240 | ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING) |
| 241 | } ASN1_SEQUENCE_END(X9_62_CURVE) |
| 242 | |
| 243 | ASN1_SEQUENCE(ECPARAMETERS) = { |
| 244 | ASN1_SIMPLE(ECPARAMETERS, version, LONG), |
| 245 | ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID), |
| 246 | ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE), |
| 247 | ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING), |
| 248 | ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER), |
| 249 | ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER) |
| 250 | } ASN1_SEQUENCE_END(ECPARAMETERS) |
| 251 | |
| 252 | DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS) |
| 253 | IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS) |
| 254 | |
| 255 | ASN1_CHOICE(ECPKPARAMETERS) = { |
| 256 | ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT), |
| 257 | ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS), |
| 258 | ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL) |
| 259 | } ASN1_CHOICE_END(ECPKPARAMETERS) |
| 260 | |
| 261 | DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS) |
| 262 | DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS) |
| 263 | IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS) |
| 264 | |
| 265 | ASN1_SEQUENCE(EC_PRIVATEKEY) = { |
| 266 | ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG), |
| 267 | ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING), |
| 268 | ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0), |
| 269 | ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1) |
| 270 | } ASN1_SEQUENCE_END(EC_PRIVATEKEY) |
| 271 | |
| 272 | DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY) |
| 273 | DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY) |
| 274 | IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY) |
| 275 | |
| 276 | /* some declarations of internal function */ |
| 277 | |
| 278 | /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */ |
| 279 | static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *); |
| 280 | /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */ |
| 281 | static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *); |
| 282 | /* ec_asn1_parameters2group() creates a EC_GROUP object from a |
| 283 | * ECPARAMETERS object */ |
| 284 | static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *); |
| 285 | /* ec_asn1_group2parameters() creates a ECPARAMETERS object from a |
| 286 | * EC_GROUP object */ |
| 287 | static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,ECPARAMETERS *); |
| 288 | /* ec_asn1_pkparameters2group() creates a EC_GROUP object from a |
| 289 | * ECPKPARAMETERS object */ |
| 290 | static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *); |
| 291 | /* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a |
| 292 | * EC_GROUP object */ |
| 293 | static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *, |
| 294 | ECPKPARAMETERS *); |
| 295 | |
| 296 | |
| 297 | /* the function definitions */ |
| 298 | |
| 299 | static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field) |
| 300 | { |
| 301 | int ok=0, nid; |
| 302 | BIGNUM *tmp = NULL; |
| 303 | |
| 304 | if (group == NULL || field == NULL) |
| 305 | return 0; |
| 306 | |
| 307 | /* clear the old values (if necessary) */ |
| 308 | if (field->fieldType != NULL) |
| 309 | ASN1_OBJECT_free(field->fieldType); |
| 310 | if (field->p.other != NULL) |
| 311 | ASN1_TYPE_free(field->p.other); |
| 312 | |
| 313 | nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group)); |
| 314 | /* set OID for the field */ |
| 315 | if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) |
| 316 | { |
| 317 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB); |
| 318 | goto err; |
| 319 | } |
| 320 | |
| 321 | if (nid == NID_X9_62_prime_field) |
| 322 | { |
| 323 | if ((tmp = BN_new()) == NULL) |
| 324 | { |
| 325 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
| 326 | goto err; |
| 327 | } |
| 328 | /* the parameters are specified by the prime number p */ |
| 329 | if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) |
| 330 | { |
| 331 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB); |
| 332 | goto err; |
| 333 | } |
| 334 | /* set the prime number */ |
| 335 | field->p.prime = BN_to_ASN1_INTEGER(tmp,NULL); |
| 336 | if (field->p.prime == NULL) |
| 337 | { |
| 338 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB); |
| 339 | goto err; |
| 340 | } |
| 341 | } |
| 342 | else /* nid == NID_X9_62_characteristic_two_field */ |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 343 | { |
| 344 | int field_type; |
| 345 | X9_62_CHARACTERISTIC_TWO *char_two; |
| 346 | |
| 347 | field->p.char_two = X9_62_CHARACTERISTIC_TWO_new(); |
| 348 | char_two = field->p.char_two; |
| 349 | |
| 350 | if (char_two == NULL) |
| 351 | { |
| 352 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
| 353 | goto err; |
| 354 | } |
| 355 | |
| 356 | char_two->m = (long)EC_GROUP_get_degree(group); |
| 357 | |
| 358 | field_type = EC_GROUP_get_basis_type(group); |
| 359 | |
| 360 | if (field_type == 0) |
| 361 | { |
| 362 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB); |
| 363 | goto err; |
| 364 | } |
| 365 | /* set base type OID */ |
| 366 | if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) |
| 367 | { |
| 368 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB); |
| 369 | goto err; |
| 370 | } |
| 371 | |
| 372 | if (field_type == NID_X9_62_tpBasis) |
| 373 | { |
| 374 | unsigned int k; |
| 375 | |
| 376 | if (!EC_GROUP_get_trinomial_basis(group, &k)) |
| 377 | goto err; |
| 378 | |
| 379 | char_two->p.tpBasis = ASN1_INTEGER_new(); |
| 380 | if (!char_two->p.tpBasis) |
| 381 | { |
| 382 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
| 383 | goto err; |
| 384 | } |
| 385 | if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) |
| 386 | { |
| 387 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, |
| 388 | ERR_R_ASN1_LIB); |
| 389 | goto err; |
| 390 | } |
| 391 | } |
| 392 | else if (field_type == NID_X9_62_ppBasis) |
| 393 | { |
| 394 | unsigned int k1, k2, k3; |
| 395 | |
| 396 | if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3)) |
| 397 | goto err; |
| 398 | |
| 399 | char_two->p.ppBasis = X9_62_PENTANOMIAL_new(); |
| 400 | if (!char_two->p.ppBasis) |
| 401 | { |
| 402 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
| 403 | goto err; |
| 404 | } |
| 405 | |
| 406 | /* set k? values */ |
| 407 | char_two->p.ppBasis->k1 = (long)k1; |
| 408 | char_two->p.ppBasis->k2 = (long)k2; |
| 409 | char_two->p.ppBasis->k3 = (long)k3; |
| 410 | } |
| 411 | else /* field_type == NID_X9_62_onBasis */ |
| 412 | { |
| 413 | /* for ONB the parameters are (asn1) NULL */ |
| 414 | char_two->p.onBasis = ASN1_NULL_new(); |
| 415 | if (!char_two->p.onBasis) |
| 416 | { |
| 417 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
| 418 | goto err; |
| 419 | } |
| 420 | } |
| 421 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 422 | |
| 423 | ok = 1; |
| 424 | |
| 425 | err : if (tmp) |
| 426 | BN_free(tmp); |
| 427 | return(ok); |
| 428 | } |
| 429 | |
| 430 | static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve) |
| 431 | { |
| 432 | int ok=0, nid; |
| 433 | BIGNUM *tmp_1=NULL, *tmp_2=NULL; |
| 434 | unsigned char *buffer_1=NULL, *buffer_2=NULL, |
| 435 | *a_buf=NULL, *b_buf=NULL; |
| 436 | size_t len_1, len_2; |
| 437 | unsigned char char_zero = 0; |
| 438 | |
| 439 | if (!group || !curve || !curve->a || !curve->b) |
| 440 | return 0; |
| 441 | |
| 442 | if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) |
| 443 | { |
| 444 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); |
| 445 | goto err; |
| 446 | } |
| 447 | |
| 448 | nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group)); |
| 449 | |
| 450 | /* get a and b */ |
| 451 | if (nid == NID_X9_62_prime_field) |
| 452 | { |
| 453 | if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) |
| 454 | { |
| 455 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB); |
| 456 | goto err; |
| 457 | } |
| 458 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 459 | else /* nid == NID_X9_62_characteristic_two_field */ |
| 460 | { |
| 461 | if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) |
| 462 | { |
| 463 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB); |
| 464 | goto err; |
| 465 | } |
| 466 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 467 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 468 | len_1 = (size_t)BN_num_bytes(tmp_1); |
| 469 | len_2 = (size_t)BN_num_bytes(tmp_2); |
| 470 | |
| 471 | if (len_1 == 0) |
| 472 | { |
| 473 | /* len_1 == 0 => a == 0 */ |
| 474 | a_buf = &char_zero; |
| 475 | len_1 = 1; |
| 476 | } |
| 477 | else |
| 478 | { |
| 479 | if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) |
| 480 | { |
| 481 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, |
| 482 | ERR_R_MALLOC_FAILURE); |
| 483 | goto err; |
| 484 | } |
| 485 | if ( (len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) |
| 486 | { |
| 487 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB); |
| 488 | goto err; |
| 489 | } |
| 490 | a_buf = buffer_1; |
| 491 | } |
| 492 | |
| 493 | if (len_2 == 0) |
| 494 | { |
| 495 | /* len_2 == 0 => b == 0 */ |
| 496 | b_buf = &char_zero; |
| 497 | len_2 = 1; |
| 498 | } |
| 499 | else |
| 500 | { |
| 501 | if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) |
| 502 | { |
| 503 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, |
| 504 | ERR_R_MALLOC_FAILURE); |
| 505 | goto err; |
| 506 | } |
| 507 | if ( (len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) |
| 508 | { |
| 509 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB); |
| 510 | goto err; |
| 511 | } |
| 512 | b_buf = buffer_2; |
| 513 | } |
| 514 | |
| 515 | /* set a and b */ |
| 516 | if (!M_ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) || |
| 517 | !M_ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) |
| 518 | { |
| 519 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB); |
| 520 | goto err; |
| 521 | } |
| 522 | |
| 523 | /* set the seed (optional) */ |
| 524 | if (group->seed) |
| 525 | { |
| 526 | if (!curve->seed) |
| 527 | if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) |
| 528 | { |
| 529 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); |
| 530 | goto err; |
| 531 | } |
| 532 | curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); |
| 533 | curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT; |
| 534 | if (!ASN1_BIT_STRING_set(curve->seed, group->seed, |
| 535 | (int)group->seed_len)) |
| 536 | { |
| 537 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB); |
| 538 | goto err; |
| 539 | } |
| 540 | } |
| 541 | else |
| 542 | { |
| 543 | if (curve->seed) |
| 544 | { |
| 545 | ASN1_BIT_STRING_free(curve->seed); |
| 546 | curve->seed = NULL; |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | ok = 1; |
| 551 | |
| 552 | err: if (buffer_1) |
| 553 | OPENSSL_free(buffer_1); |
| 554 | if (buffer_2) |
| 555 | OPENSSL_free(buffer_2); |
| 556 | if (tmp_1) |
| 557 | BN_free(tmp_1); |
| 558 | if (tmp_2) |
| 559 | BN_free(tmp_2); |
| 560 | return(ok); |
| 561 | } |
| 562 | |
| 563 | static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group, |
| 564 | ECPARAMETERS *param) |
| 565 | { |
| 566 | int ok=0; |
| 567 | size_t len=0; |
| 568 | ECPARAMETERS *ret=NULL; |
| 569 | BIGNUM *tmp=NULL; |
| 570 | unsigned char *buffer=NULL; |
| 571 | const EC_POINT *point=NULL; |
| 572 | point_conversion_form_t form; |
| 573 | |
| 574 | if ((tmp = BN_new()) == NULL) |
| 575 | { |
| 576 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE); |
| 577 | goto err; |
| 578 | } |
| 579 | |
| 580 | if (param == NULL) |
| 581 | { |
| 582 | if ((ret = ECPARAMETERS_new()) == NULL) |
| 583 | { |
| 584 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, |
| 585 | ERR_R_MALLOC_FAILURE); |
| 586 | goto err; |
| 587 | } |
| 588 | } |
| 589 | else |
| 590 | ret = param; |
| 591 | |
| 592 | /* set the version (always one) */ |
| 593 | ret->version = (long)0x1; |
| 594 | |
| 595 | /* set the fieldID */ |
| 596 | if (!ec_asn1_group2fieldid(group, ret->fieldID)) |
| 597 | { |
| 598 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB); |
| 599 | goto err; |
| 600 | } |
| 601 | |
| 602 | /* set the curve */ |
| 603 | if (!ec_asn1_group2curve(group, ret->curve)) |
| 604 | { |
| 605 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB); |
| 606 | goto err; |
| 607 | } |
| 608 | |
| 609 | /* set the base point */ |
| 610 | if ((point = EC_GROUP_get0_generator(group)) == NULL) |
| 611 | { |
| 612 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR); |
| 613 | goto err; |
| 614 | } |
| 615 | |
| 616 | form = EC_GROUP_get_point_conversion_form(group); |
| 617 | |
| 618 | len = EC_POINT_point2oct(group, point, form, NULL, len, NULL); |
| 619 | if (len == 0) |
| 620 | { |
| 621 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB); |
| 622 | goto err; |
| 623 | } |
| 624 | if ((buffer = OPENSSL_malloc(len)) == NULL) |
| 625 | { |
| 626 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE); |
| 627 | goto err; |
| 628 | } |
| 629 | if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) |
| 630 | { |
| 631 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB); |
| 632 | goto err; |
| 633 | } |
| 634 | if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) |
| 635 | { |
| 636 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE); |
| 637 | goto err; |
| 638 | } |
| 639 | if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) |
| 640 | { |
| 641 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB); |
| 642 | goto err; |
| 643 | } |
| 644 | |
| 645 | /* set the order */ |
| 646 | if (!EC_GROUP_get_order(group, tmp, NULL)) |
| 647 | { |
| 648 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB); |
| 649 | goto err; |
| 650 | } |
| 651 | ret->order = BN_to_ASN1_INTEGER(tmp, ret->order); |
| 652 | if (ret->order == NULL) |
| 653 | { |
| 654 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB); |
| 655 | goto err; |
| 656 | } |
| 657 | |
| 658 | /* set the cofactor (optional) */ |
| 659 | if (EC_GROUP_get_cofactor(group, tmp, NULL)) |
| 660 | { |
| 661 | ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor); |
| 662 | if (ret->cofactor == NULL) |
| 663 | { |
| 664 | ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB); |
| 665 | goto err; |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | ok = 1; |
| 670 | |
| 671 | err : if(!ok) |
| 672 | { |
| 673 | if (ret && !param) |
| 674 | ECPARAMETERS_free(ret); |
| 675 | ret = NULL; |
| 676 | } |
| 677 | if (tmp) |
| 678 | BN_free(tmp); |
| 679 | if (buffer) |
| 680 | OPENSSL_free(buffer); |
| 681 | return(ret); |
| 682 | } |
| 683 | |
| 684 | ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group, |
| 685 | ECPKPARAMETERS *params) |
| 686 | { |
| 687 | int ok = 1, tmp; |
| 688 | ECPKPARAMETERS *ret = params; |
| 689 | |
| 690 | if (ret == NULL) |
| 691 | { |
| 692 | if ((ret = ECPKPARAMETERS_new()) == NULL) |
| 693 | { |
| 694 | ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, |
| 695 | ERR_R_MALLOC_FAILURE); |
| 696 | return NULL; |
| 697 | } |
| 698 | } |
| 699 | else |
| 700 | { |
| 701 | if (ret->type == 0 && ret->value.named_curve) |
| 702 | ASN1_OBJECT_free(ret->value.named_curve); |
| 703 | else if (ret->type == 1 && ret->value.parameters) |
| 704 | ECPARAMETERS_free(ret->value.parameters); |
| 705 | } |
| 706 | |
| 707 | if (EC_GROUP_get_asn1_flag(group)) |
| 708 | { |
| 709 | /* use the asn1 OID to describe the |
| 710 | * the elliptic curve parameters |
| 711 | */ |
| 712 | tmp = EC_GROUP_get_curve_name(group); |
| 713 | if (tmp) |
| 714 | { |
| 715 | ret->type = 0; |
| 716 | if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL) |
| 717 | ok = 0; |
| 718 | } |
| 719 | else |
| 720 | /* we don't kmow the nid => ERROR */ |
| 721 | ok = 0; |
| 722 | } |
| 723 | else |
| 724 | { |
| 725 | /* use the ECPARAMETERS structure */ |
| 726 | ret->type = 1; |
| 727 | if ((ret->value.parameters = ec_asn1_group2parameters( |
| 728 | group, NULL)) == NULL) |
| 729 | ok = 0; |
| 730 | } |
| 731 | |
| 732 | if (!ok) |
| 733 | { |
| 734 | ECPKPARAMETERS_free(ret); |
| 735 | return NULL; |
| 736 | } |
| 737 | return ret; |
| 738 | } |
| 739 | |
| 740 | static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params) |
| 741 | { |
| 742 | int ok = 0, tmp; |
| 743 | EC_GROUP *ret = NULL; |
| 744 | BIGNUM *p = NULL, *a = NULL, *b = NULL; |
| 745 | EC_POINT *point=NULL; |
| 746 | long field_bits; |
| 747 | |
| 748 | if (!params->fieldID || !params->fieldID->fieldType || |
| 749 | !params->fieldID->p.ptr) |
| 750 | { |
| 751 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR); |
| 752 | goto err; |
| 753 | } |
| 754 | |
| 755 | /* now extract the curve parameters a and b */ |
| 756 | if (!params->curve || !params->curve->a || |
| 757 | !params->curve->a->data || !params->curve->b || |
| 758 | !params->curve->b->data) |
| 759 | { |
| 760 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR); |
| 761 | goto err; |
| 762 | } |
| 763 | a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL); |
| 764 | if (a == NULL) |
| 765 | { |
| 766 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB); |
| 767 | goto err; |
| 768 | } |
| 769 | b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL); |
| 770 | if (b == NULL) |
| 771 | { |
| 772 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB); |
| 773 | goto err; |
| 774 | } |
| 775 | |
| 776 | /* get the field parameters */ |
| 777 | tmp = OBJ_obj2nid(params->fieldID->fieldType); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 778 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 779 | if (tmp == NID_X9_62_characteristic_two_field) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 780 | { |
| 781 | X9_62_CHARACTERISTIC_TWO *char_two; |
| 782 | |
| 783 | char_two = params->fieldID->p.char_two; |
| 784 | |
| 785 | field_bits = char_two->m; |
| 786 | if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) |
| 787 | { |
| 788 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE); |
| 789 | goto err; |
| 790 | } |
| 791 | |
| 792 | if ((p = BN_new()) == NULL) |
| 793 | { |
| 794 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE); |
| 795 | goto err; |
| 796 | } |
| 797 | |
| 798 | /* get the base type */ |
| 799 | tmp = OBJ_obj2nid(char_two->type); |
| 800 | |
| 801 | if (tmp == NID_X9_62_tpBasis) |
| 802 | { |
| 803 | long tmp_long; |
| 804 | |
| 805 | if (!char_two->p.tpBasis) |
| 806 | { |
| 807 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR); |
| 808 | goto err; |
| 809 | } |
| 810 | |
| 811 | tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis); |
| 812 | |
| 813 | if (!(char_two->m > tmp_long && tmp_long > 0)) |
| 814 | { |
| 815 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_TRINOMIAL_BASIS); |
| 816 | goto err; |
| 817 | } |
| 818 | |
| 819 | /* create the polynomial */ |
| 820 | if (!BN_set_bit(p, (int)char_two->m)) |
| 821 | goto err; |
| 822 | if (!BN_set_bit(p, (int)tmp_long)) |
| 823 | goto err; |
| 824 | if (!BN_set_bit(p, 0)) |
| 825 | goto err; |
| 826 | } |
| 827 | else if (tmp == NID_X9_62_ppBasis) |
| 828 | { |
| 829 | X9_62_PENTANOMIAL *penta; |
| 830 | |
| 831 | penta = char_two->p.ppBasis; |
| 832 | if (!penta) |
| 833 | { |
| 834 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR); |
| 835 | goto err; |
| 836 | } |
| 837 | |
| 838 | if (!(char_two->m > penta->k3 && penta->k3 > penta->k2 && penta->k2 > penta->k1 && penta->k1 > 0)) |
| 839 | { |
| 840 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_PENTANOMIAL_BASIS); |
| 841 | goto err; |
| 842 | } |
| 843 | |
| 844 | /* create the polynomial */ |
| 845 | if (!BN_set_bit(p, (int)char_two->m)) goto err; |
| 846 | if (!BN_set_bit(p, (int)penta->k1)) goto err; |
| 847 | if (!BN_set_bit(p, (int)penta->k2)) goto err; |
| 848 | if (!BN_set_bit(p, (int)penta->k3)) goto err; |
| 849 | if (!BN_set_bit(p, 0)) goto err; |
| 850 | } |
| 851 | else if (tmp == NID_X9_62_onBasis) |
| 852 | { |
| 853 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED); |
| 854 | goto err; |
| 855 | } |
| 856 | else /* error */ |
| 857 | { |
| 858 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR); |
| 859 | goto err; |
| 860 | } |
| 861 | |
| 862 | /* create the EC_GROUP structure */ |
| 863 | ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL); |
| 864 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 865 | else if (tmp == NID_X9_62_prime_field) |
| 866 | { |
| 867 | /* we have a curve over a prime field */ |
| 868 | /* extract the prime number */ |
| 869 | if (!params->fieldID->p.prime) |
| 870 | { |
| 871 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR); |
| 872 | goto err; |
| 873 | } |
| 874 | p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL); |
| 875 | if (p == NULL) |
| 876 | { |
| 877 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB); |
| 878 | goto err; |
| 879 | } |
| 880 | |
| 881 | if (BN_is_negative(p) || BN_is_zero(p)) |
| 882 | { |
| 883 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD); |
| 884 | goto err; |
| 885 | } |
| 886 | |
| 887 | field_bits = BN_num_bits(p); |
| 888 | if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) |
| 889 | { |
| 890 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE); |
| 891 | goto err; |
| 892 | } |
| 893 | |
| 894 | /* create the EC_GROUP structure */ |
| 895 | ret = EC_GROUP_new_curve_GFp(p, a, b, NULL); |
| 896 | } |
| 897 | else |
| 898 | { |
| 899 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD); |
| 900 | goto err; |
| 901 | } |
| 902 | |
| 903 | if (ret == NULL) |
| 904 | { |
| 905 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB); |
| 906 | goto err; |
| 907 | } |
| 908 | |
| 909 | /* extract seed (optional) */ |
| 910 | if (params->curve->seed != NULL) |
| 911 | { |
| 912 | if (ret->seed != NULL) |
| 913 | OPENSSL_free(ret->seed); |
| 914 | if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length))) |
| 915 | { |
| 916 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, |
| 917 | ERR_R_MALLOC_FAILURE); |
| 918 | goto err; |
| 919 | } |
| 920 | memcpy(ret->seed, params->curve->seed->data, |
| 921 | params->curve->seed->length); |
| 922 | ret->seed_len = params->curve->seed->length; |
| 923 | } |
| 924 | |
| 925 | if (!params->order || !params->base || !params->base->data) |
| 926 | { |
| 927 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR); |
| 928 | goto err; |
| 929 | } |
| 930 | |
| 931 | if ((point = EC_POINT_new(ret)) == NULL) goto err; |
| 932 | |
| 933 | /* set the point conversion form */ |
| 934 | EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t) |
| 935 | (params->base->data[0] & ~0x01)); |
| 936 | |
| 937 | /* extract the ec point */ |
| 938 | if (!EC_POINT_oct2point(ret, point, params->base->data, |
| 939 | params->base->length, NULL)) |
| 940 | { |
| 941 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB); |
| 942 | goto err; |
| 943 | } |
| 944 | |
| 945 | /* extract the order */ |
| 946 | if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) |
| 947 | { |
| 948 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB); |
| 949 | goto err; |
| 950 | } |
| 951 | if (BN_is_negative(a) || BN_is_zero(a)) |
| 952 | { |
| 953 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER); |
| 954 | goto err; |
| 955 | } |
| 956 | if (BN_num_bits(a) > (int)field_bits + 1) /* Hasse bound */ |
| 957 | { |
| 958 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER); |
| 959 | goto err; |
| 960 | } |
| 961 | |
| 962 | /* extract the cofactor (optional) */ |
| 963 | if (params->cofactor == NULL) |
| 964 | { |
| 965 | if (b) |
| 966 | { |
| 967 | BN_free(b); |
| 968 | b = NULL; |
| 969 | } |
| 970 | } |
| 971 | else |
| 972 | if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) |
| 973 | { |
| 974 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB); |
| 975 | goto err; |
| 976 | } |
| 977 | /* set the generator, order and cofactor (if present) */ |
| 978 | if (!EC_GROUP_set_generator(ret, point, a, b)) |
| 979 | { |
| 980 | ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB); |
| 981 | goto err; |
| 982 | } |
| 983 | |
| 984 | ok = 1; |
| 985 | |
| 986 | err: if (!ok) |
| 987 | { |
| 988 | if (ret) |
| 989 | EC_GROUP_clear_free(ret); |
| 990 | ret = NULL; |
| 991 | } |
| 992 | |
| 993 | if (p) |
| 994 | BN_free(p); |
| 995 | if (a) |
| 996 | BN_free(a); |
| 997 | if (b) |
| 998 | BN_free(b); |
| 999 | if (point) |
| 1000 | EC_POINT_free(point); |
| 1001 | return(ret); |
| 1002 | } |
| 1003 | |
| 1004 | EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params) |
| 1005 | { |
| 1006 | EC_GROUP *ret=NULL; |
| 1007 | int tmp=0; |
| 1008 | |
| 1009 | if (params == NULL) |
| 1010 | { |
| 1011 | ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, |
| 1012 | EC_R_MISSING_PARAMETERS); |
| 1013 | return NULL; |
| 1014 | } |
| 1015 | |
| 1016 | if (params->type == 0) |
| 1017 | { /* the curve is given by an OID */ |
| 1018 | tmp = OBJ_obj2nid(params->value.named_curve); |
| 1019 | if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) |
| 1020 | { |
| 1021 | ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, |
| 1022 | EC_R_EC_GROUP_NEW_BY_NAME_FAILURE); |
| 1023 | return NULL; |
| 1024 | } |
| 1025 | EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE); |
| 1026 | } |
| 1027 | else if (params->type == 1) |
| 1028 | { /* the parameters are given by a ECPARAMETERS |
| 1029 | * structure */ |
| 1030 | ret = ec_asn1_parameters2group(params->value.parameters); |
| 1031 | if (!ret) |
| 1032 | { |
| 1033 | ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB); |
| 1034 | return NULL; |
| 1035 | } |
| 1036 | EC_GROUP_set_asn1_flag(ret, 0x0); |
| 1037 | } |
| 1038 | else if (params->type == 2) |
| 1039 | { /* implicitlyCA */ |
| 1040 | return NULL; |
| 1041 | } |
| 1042 | else |
| 1043 | { |
| 1044 | ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR); |
| 1045 | return NULL; |
| 1046 | } |
| 1047 | |
| 1048 | return ret; |
| 1049 | } |
| 1050 | |
| 1051 | /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */ |
| 1052 | |
| 1053 | EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len) |
| 1054 | { |
| 1055 | EC_GROUP *group = NULL; |
| 1056 | ECPKPARAMETERS *params = NULL; |
| 1057 | |
| 1058 | if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL) |
| 1059 | { |
| 1060 | ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE); |
| 1061 | ECPKPARAMETERS_free(params); |
| 1062 | return NULL; |
| 1063 | } |
| 1064 | |
| 1065 | if ((group = ec_asn1_pkparameters2group(params)) == NULL) |
| 1066 | { |
| 1067 | ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1068 | return NULL; |
| 1069 | } |
| 1070 | |
| 1071 | |
| 1072 | if (a && *a) |
| 1073 | EC_GROUP_clear_free(*a); |
| 1074 | if (a) |
| 1075 | *a = group; |
| 1076 | |
| 1077 | ECPKPARAMETERS_free(params); |
| 1078 | return(group); |
| 1079 | } |
| 1080 | |
| 1081 | int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out) |
| 1082 | { |
| 1083 | int ret=0; |
| 1084 | ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL); |
| 1085 | if (tmp == NULL) |
| 1086 | { |
| 1087 | ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE); |
| 1088 | return 0; |
| 1089 | } |
| 1090 | if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) |
| 1091 | { |
| 1092 | ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE); |
| 1093 | ECPKPARAMETERS_free(tmp); |
| 1094 | return 0; |
| 1095 | } |
| 1096 | ECPKPARAMETERS_free(tmp); |
| 1097 | return(ret); |
| 1098 | } |
| 1099 | |
| 1100 | /* some EC_KEY functions */ |
| 1101 | |
| 1102 | EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len) |
| 1103 | { |
| 1104 | int ok=0; |
| 1105 | EC_KEY *ret=NULL; |
| 1106 | EC_PRIVATEKEY *priv_key=NULL; |
| 1107 | |
| 1108 | if ((priv_key = EC_PRIVATEKEY_new()) == NULL) |
| 1109 | { |
| 1110 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); |
| 1111 | return NULL; |
| 1112 | } |
| 1113 | |
| 1114 | if ((priv_key = d2i_EC_PRIVATEKEY(&priv_key, in, len)) == NULL) |
| 1115 | { |
| 1116 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); |
| 1117 | EC_PRIVATEKEY_free(priv_key); |
| 1118 | return NULL; |
| 1119 | } |
| 1120 | |
| 1121 | if (a == NULL || *a == NULL) |
| 1122 | { |
| 1123 | if ((ret = EC_KEY_new()) == NULL) |
| 1124 | { |
| 1125 | ECerr(EC_F_D2I_ECPRIVATEKEY, |
| 1126 | ERR_R_MALLOC_FAILURE); |
| 1127 | goto err; |
| 1128 | } |
| 1129 | if (a) |
| 1130 | *a = ret; |
| 1131 | } |
| 1132 | else |
| 1133 | ret = *a; |
| 1134 | |
| 1135 | if (priv_key->parameters) |
| 1136 | { |
| 1137 | if (ret->group) |
| 1138 | EC_GROUP_clear_free(ret->group); |
| 1139 | ret->group = ec_asn1_pkparameters2group(priv_key->parameters); |
| 1140 | } |
| 1141 | |
| 1142 | if (ret->group == NULL) |
| 1143 | { |
| 1144 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); |
| 1145 | goto err; |
| 1146 | } |
| 1147 | |
| 1148 | ret->version = priv_key->version; |
| 1149 | |
| 1150 | if (priv_key->privateKey) |
| 1151 | { |
| 1152 | ret->priv_key = BN_bin2bn( |
| 1153 | M_ASN1_STRING_data(priv_key->privateKey), |
| 1154 | M_ASN1_STRING_length(priv_key->privateKey), |
| 1155 | ret->priv_key); |
| 1156 | if (ret->priv_key == NULL) |
| 1157 | { |
| 1158 | ECerr(EC_F_D2I_ECPRIVATEKEY, |
| 1159 | ERR_R_BN_LIB); |
| 1160 | goto err; |
| 1161 | } |
| 1162 | } |
| 1163 | else |
| 1164 | { |
| 1165 | ECerr(EC_F_D2I_ECPRIVATEKEY, |
| 1166 | EC_R_MISSING_PRIVATE_KEY); |
| 1167 | goto err; |
| 1168 | } |
| 1169 | |
| 1170 | if (priv_key->publicKey) |
| 1171 | { |
| 1172 | const unsigned char *pub_oct; |
| 1173 | size_t pub_oct_len; |
| 1174 | |
| 1175 | if (ret->pub_key) |
| 1176 | EC_POINT_clear_free(ret->pub_key); |
| 1177 | ret->pub_key = EC_POINT_new(ret->group); |
| 1178 | if (ret->pub_key == NULL) |
| 1179 | { |
| 1180 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); |
| 1181 | goto err; |
| 1182 | } |
| 1183 | pub_oct = M_ASN1_STRING_data(priv_key->publicKey); |
| 1184 | pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey); |
| 1185 | /* save the point conversion form */ |
| 1186 | ret->conv_form = (point_conversion_form_t)(pub_oct[0] & ~0x01); |
| 1187 | if (!EC_POINT_oct2point(ret->group, ret->pub_key, |
| 1188 | pub_oct, pub_oct_len, NULL)) |
| 1189 | { |
| 1190 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); |
| 1191 | goto err; |
| 1192 | } |
| 1193 | } |
| 1194 | |
| 1195 | ok = 1; |
| 1196 | err: |
| 1197 | if (!ok) |
| 1198 | { |
| 1199 | if (ret) |
| 1200 | EC_KEY_free(ret); |
| 1201 | ret = NULL; |
| 1202 | } |
| 1203 | |
| 1204 | if (priv_key) |
| 1205 | EC_PRIVATEKEY_free(priv_key); |
| 1206 | |
| 1207 | return(ret); |
| 1208 | } |
| 1209 | |
| 1210 | int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out) |
| 1211 | { |
| 1212 | int ret=0, ok=0; |
| 1213 | unsigned char *buffer=NULL; |
| 1214 | size_t buf_len=0, tmp_len; |
| 1215 | EC_PRIVATEKEY *priv_key=NULL; |
| 1216 | |
| 1217 | if (a == NULL || a->group == NULL || a->priv_key == NULL) |
| 1218 | { |
| 1219 | ECerr(EC_F_I2D_ECPRIVATEKEY, |
| 1220 | ERR_R_PASSED_NULL_PARAMETER); |
| 1221 | goto err; |
| 1222 | } |
| 1223 | |
| 1224 | if ((priv_key = EC_PRIVATEKEY_new()) == NULL) |
| 1225 | { |
| 1226 | ECerr(EC_F_I2D_ECPRIVATEKEY, |
| 1227 | ERR_R_MALLOC_FAILURE); |
| 1228 | goto err; |
| 1229 | } |
| 1230 | |
| 1231 | priv_key->version = a->version; |
| 1232 | |
| 1233 | buf_len = (size_t)BN_num_bytes(a->priv_key); |
| 1234 | buffer = OPENSSL_malloc(buf_len); |
| 1235 | if (buffer == NULL) |
| 1236 | { |
| 1237 | ECerr(EC_F_I2D_ECPRIVATEKEY, |
| 1238 | ERR_R_MALLOC_FAILURE); |
| 1239 | goto err; |
| 1240 | } |
| 1241 | |
| 1242 | if (!BN_bn2bin(a->priv_key, buffer)) |
| 1243 | { |
| 1244 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB); |
| 1245 | goto err; |
| 1246 | } |
| 1247 | |
| 1248 | if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len)) |
| 1249 | { |
| 1250 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB); |
| 1251 | goto err; |
| 1252 | } |
| 1253 | |
| 1254 | if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) |
| 1255 | { |
| 1256 | if ((priv_key->parameters = ec_asn1_group2pkparameters( |
| 1257 | a->group, priv_key->parameters)) == NULL) |
| 1258 | { |
| 1259 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); |
| 1260 | goto err; |
| 1261 | } |
| 1262 | } |
| 1263 | |
| 1264 | if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) |
| 1265 | { |
| 1266 | priv_key->publicKey = M_ASN1_BIT_STRING_new(); |
| 1267 | if (priv_key->publicKey == NULL) |
| 1268 | { |
| 1269 | ECerr(EC_F_I2D_ECPRIVATEKEY, |
| 1270 | ERR_R_MALLOC_FAILURE); |
| 1271 | goto err; |
| 1272 | } |
| 1273 | |
| 1274 | tmp_len = EC_POINT_point2oct(a->group, a->pub_key, |
| 1275 | a->conv_form, NULL, 0, NULL); |
| 1276 | |
| 1277 | if (tmp_len > buf_len) |
| 1278 | { |
| 1279 | unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len); |
| 1280 | if (!tmp_buffer) |
| 1281 | { |
| 1282 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); |
| 1283 | goto err; |
| 1284 | } |
| 1285 | buffer = tmp_buffer; |
| 1286 | buf_len = tmp_len; |
| 1287 | } |
| 1288 | |
| 1289 | if (!EC_POINT_point2oct(a->group, a->pub_key, |
| 1290 | a->conv_form, buffer, buf_len, NULL)) |
| 1291 | { |
| 1292 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); |
| 1293 | goto err; |
| 1294 | } |
| 1295 | |
| 1296 | priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); |
| 1297 | priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT; |
| 1298 | if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer, |
| 1299 | buf_len)) |
| 1300 | { |
| 1301 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB); |
| 1302 | goto err; |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) |
| 1307 | { |
| 1308 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); |
| 1309 | goto err; |
| 1310 | } |
| 1311 | ok=1; |
| 1312 | err: |
| 1313 | if (buffer) |
| 1314 | OPENSSL_free(buffer); |
| 1315 | if (priv_key) |
| 1316 | EC_PRIVATEKEY_free(priv_key); |
| 1317 | return(ok?ret:0); |
| 1318 | } |
| 1319 | |
| 1320 | int i2d_ECParameters(EC_KEY *a, unsigned char **out) |
| 1321 | { |
| 1322 | if (a == NULL) |
| 1323 | { |
| 1324 | ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER); |
| 1325 | return 0; |
| 1326 | } |
| 1327 | return i2d_ECPKParameters(a->group, out); |
| 1328 | } |
| 1329 | |
| 1330 | EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len) |
| 1331 | { |
| 1332 | EC_KEY *ret; |
| 1333 | |
| 1334 | if (in == NULL || *in == NULL) |
| 1335 | { |
| 1336 | ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER); |
| 1337 | return NULL; |
| 1338 | } |
| 1339 | |
| 1340 | if (a == NULL || *a == NULL) |
| 1341 | { |
| 1342 | if ((ret = EC_KEY_new()) == NULL) |
| 1343 | { |
| 1344 | ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE); |
| 1345 | return NULL; |
| 1346 | } |
| 1347 | if (a) |
| 1348 | *a = ret; |
| 1349 | } |
| 1350 | else |
| 1351 | ret = *a; |
| 1352 | |
| 1353 | if (!d2i_ECPKParameters(&ret->group, in, len)) |
| 1354 | { |
| 1355 | ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB); |
| 1356 | return NULL; |
| 1357 | } |
| 1358 | |
| 1359 | return ret; |
| 1360 | } |
| 1361 | |
| 1362 | EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len) |
| 1363 | { |
| 1364 | EC_KEY *ret=NULL; |
| 1365 | |
| 1366 | if (a == NULL || (*a) == NULL || (*a)->group == NULL) |
| 1367 | { |
| 1368 | /* sorry, but a EC_GROUP-structur is necessary |
| 1369 | * to set the public key */ |
| 1370 | ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER); |
| 1371 | return 0; |
| 1372 | } |
| 1373 | ret = *a; |
| 1374 | if (ret->pub_key == NULL && |
| 1375 | (ret->pub_key = EC_POINT_new(ret->group)) == NULL) |
| 1376 | { |
| 1377 | ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE); |
| 1378 | return 0; |
| 1379 | } |
| 1380 | if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) |
| 1381 | { |
| 1382 | ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB); |
| 1383 | return 0; |
| 1384 | } |
| 1385 | /* save the point conversion form */ |
| 1386 | ret->conv_form = (point_conversion_form_t)(*in[0] & ~0x01); |
| 1387 | *in += len; |
| 1388 | return ret; |
| 1389 | } |
| 1390 | |
| 1391 | int i2o_ECPublicKey(EC_KEY *a, unsigned char **out) |
| 1392 | { |
| 1393 | size_t buf_len=0; |
| 1394 | int new_buffer = 0; |
| 1395 | |
| 1396 | if (a == NULL) |
| 1397 | { |
| 1398 | ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER); |
| 1399 | return 0; |
| 1400 | } |
| 1401 | |
| 1402 | buf_len = EC_POINT_point2oct(a->group, a->pub_key, |
| 1403 | a->conv_form, NULL, 0, NULL); |
| 1404 | |
| 1405 | if (out == NULL || buf_len == 0) |
| 1406 | /* out == NULL => just return the length of the octet string */ |
| 1407 | return buf_len; |
| 1408 | |
| 1409 | if (*out == NULL) |
| 1410 | { |
| 1411 | if ((*out = OPENSSL_malloc(buf_len)) == NULL) |
| 1412 | { |
| 1413 | ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE); |
| 1414 | return 0; |
| 1415 | } |
| 1416 | new_buffer = 1; |
| 1417 | } |
| 1418 | if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form, |
| 1419 | *out, buf_len, NULL)) |
| 1420 | { |
| 1421 | ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB); |
| 1422 | OPENSSL_free(*out); |
| 1423 | *out = NULL; |
| 1424 | return 0; |
| 1425 | } |
| 1426 | if (!new_buffer) |
| 1427 | *out += buf_len; |
| 1428 | return buf_len; |
| 1429 | } |