1 /* 2 * Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved. 3 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. 4 * 5 * Licensed under the Apache License 2.0 (the "License"). You may not use 6 * this file except in compliance with the License. You can obtain a copy 7 * in the file LICENSE in the source distribution or at 8 * https://www.openssl.org/source/license.html 9 */ 10 11 #include "e_os.h" 12 #include <openssl/core_names.h> 13 #include <openssl/core_dispatch.h> 14 #include <openssl/err.h> 15 #include <openssl/evp.h> 16 #include <openssl/params.h> 17 #include <openssl/proverr.h> 18 #include "internal/packet.h" 19 #include "internal/der.h" 20 #include "prov/provider_ctx.h" 21 #include "prov/providercommon.h" 22 #include "prov/implementations.h" 23 #include "prov/provider_util.h" 24 #include "prov/der_wrap.h" 25 26 #define X942KDF_MAX_INLEN (1 << 30) 27 28 static OSSL_FUNC_kdf_newctx_fn x942kdf_new; 29 static OSSL_FUNC_kdf_freectx_fn x942kdf_free; 30 static OSSL_FUNC_kdf_reset_fn x942kdf_reset; 31 static OSSL_FUNC_kdf_derive_fn x942kdf_derive; 32 static OSSL_FUNC_kdf_settable_ctx_params_fn x942kdf_settable_ctx_params; 33 static OSSL_FUNC_kdf_set_ctx_params_fn x942kdf_set_ctx_params; 34 static OSSL_FUNC_kdf_gettable_ctx_params_fn x942kdf_gettable_ctx_params; 35 static OSSL_FUNC_kdf_get_ctx_params_fn x942kdf_get_ctx_params; 36 37 typedef struct { 38 void *provctx; 39 PROV_DIGEST digest; 40 unsigned char *secret; 41 size_t secret_len; 42 unsigned char *acvpinfo; 43 size_t acvpinfo_len; 44 unsigned char *partyuinfo, *partyvinfo, *supp_pubinfo, *supp_privinfo; 45 size_t partyuinfo_len, partyvinfo_len, supp_pubinfo_len, supp_privinfo_len; 46 size_t dkm_len; 47 const unsigned char *cek_oid; 48 size_t cek_oid_len; 49 int use_keybits; 50 } KDF_X942; 51 52 /* 53 * A table of allowed wrapping algorithms, oids and the associated output 54 * lengths. 55 * NOTE: RC2wrap and camellia128_wrap have been removed as there are no 56 * corresponding ciphers for these operations. 57 */ 58 static const struct { 59 const char *name; 60 const unsigned char *oid; 61 size_t oid_len; 62 size_t keklen; /* size in bytes */ 63 } kek_algs[] = { 64 { "AES-128-WRAP", ossl_der_oid_id_aes128_wrap, DER_OID_SZ_id_aes128_wrap, 65 16 }, 66 { "AES-192-WRAP", ossl_der_oid_id_aes192_wrap, DER_OID_SZ_id_aes192_wrap, 67 24 }, 68 { "AES-256-WRAP", ossl_der_oid_id_aes256_wrap, DER_OID_SZ_id_aes256_wrap, 69 32 }, 70 #ifndef FIPS_MODULE 71 { "DES3-WRAP", ossl_der_oid_id_alg_CMS3DESwrap, 72 DER_OID_SZ_id_alg_CMS3DESwrap, 24 }, 73 #endif 74 }; 75 76 static int find_alg_id(OSSL_LIB_CTX *libctx, const char *algname, 77 const char *propq, size_t *id) 78 { 79 int ret = 1; 80 size_t i; 81 EVP_CIPHER *cipher; 82 83 cipher = EVP_CIPHER_fetch(libctx, algname, propq); 84 if (cipher != NULL) { 85 for (i = 0; i < OSSL_NELEM(kek_algs); i++) { 86 if (EVP_CIPHER_is_a(cipher, kek_algs[i].name)) { 87 *id = i; 88 goto end; 89 } 90 } 91 } 92 ret = 0; 93 ERR_raise(ERR_LIB_PROV, PROV_R_UNSUPPORTED_CEK_ALG); 94 end: 95 EVP_CIPHER_free(cipher); 96 return ret; 97 } 98 99 static int DER_w_keyinfo(WPACKET *pkt, 100 const unsigned char *der_oid, size_t der_oidlen, 101 unsigned char **pcounter) 102 { 103 return ossl_DER_w_begin_sequence(pkt, -1) 104 /* Store the initial value of 1 into the counter */ 105 && ossl_DER_w_octet_string_uint32(pkt, -1, 1) 106 /* Remember where we stored the counter in the buffer */ 107 && (pcounter == NULL 108 || (*pcounter = WPACKET_get_curr(pkt)) != NULL) 109 && ossl_DER_w_precompiled(pkt, -1, der_oid, der_oidlen) 110 && ossl_DER_w_end_sequence(pkt, -1); 111 } 112 113 static int der_encode_sharedinfo(WPACKET *pkt, unsigned char *buf, size_t buflen, 114 const unsigned char *der_oid, size_t der_oidlen, 115 const unsigned char *acvp, size_t acvplen, 116 const unsigned char *partyu, size_t partyulen, 117 const unsigned char *partyv, size_t partyvlen, 118 const unsigned char *supp_pub, size_t supp_publen, 119 const unsigned char *supp_priv, size_t supp_privlen, 120 uint32_t keylen_bits, unsigned char **pcounter) 121 { 122 return (buf != NULL ? WPACKET_init_der(pkt, buf, buflen) : 123 WPACKET_init_null_der(pkt)) 124 && ossl_DER_w_begin_sequence(pkt, -1) 125 && (supp_priv == NULL 126 || ossl_DER_w_octet_string(pkt, 3, supp_priv, supp_privlen)) 127 && (supp_pub == NULL 128 || ossl_DER_w_octet_string(pkt, 2, supp_pub, supp_publen)) 129 && (keylen_bits == 0 130 || ossl_DER_w_octet_string_uint32(pkt, 2, keylen_bits)) 131 && (partyv == NULL || ossl_DER_w_octet_string(pkt, 1, partyv, partyvlen)) 132 && (partyu == NULL || ossl_DER_w_octet_string(pkt, 0, partyu, partyulen)) 133 && (acvp == NULL || ossl_DER_w_precompiled(pkt, -1, acvp, acvplen)) 134 && DER_w_keyinfo(pkt, der_oid, der_oidlen, pcounter) 135 && ossl_DER_w_end_sequence(pkt, -1) 136 && WPACKET_finish(pkt); 137 } 138 139 /* 140 * Encode the other info structure. 141 * 142 * The ANS X9.42-2003 standard uses OtherInfo: 143 * 144 * OtherInfo ::= SEQUENCE { 145 * keyInfo KeySpecificInfo, 146 * partyUInfo [0] OCTET STRING OPTIONAL, 147 * partyVInfo [1] OCTET STRING OPTIONAL, 148 * suppPubInfo [2] OCTET STRING OPTIONAL, 149 * suppPrivInfo [3] OCTET STRING OPTIONAL 150 * } 151 * 152 * KeySpecificInfo ::= SEQUENCE { 153 * algorithm OBJECT IDENTIFIER, 154 * counter OCTET STRING SIZE (4..4) 155 * } 156 * 157 * RFC2631 Section 2.1.2 Contains the following definition for OtherInfo 158 * 159 * OtherInfo ::= SEQUENCE { 160 * keyInfo KeySpecificInfo, 161 * partyAInfo [0] OCTET STRING OPTIONAL, 162 * suppPubInfo [2] OCTET STRING 163 * } 164 * Where suppPubInfo is the key length (in bits) (stored into 4 bytes) 165 * 166 * |keylen| is the length (in bytes) of the generated KEK. It is stored into 167 * suppPubInfo (in bits). It is ignored if the value is 0. 168 * |cek_oid| The oid of the key wrapping algorithm. 169 * |cek_oidlen| The length (in bytes) of the key wrapping algorithm oid, 170 * |acvp| is the optional blob of DER data representing one or more of the 171 * OtherInfo fields related to |partyu|, |partyv|, |supp_pub| and |supp_priv|. 172 * This field should noramlly be NULL. If |acvp| is non NULL then |partyu|, 173 * |partyv|, |supp_pub| and |supp_priv| should all be NULL. 174 * |acvp_len| is the |acvp| length (in bytes). 175 * |partyu| is the optional public info contributed by the initiator. 176 * It can be NULL. (It is also used as the ukm by CMS). 177 * |partyu_len| is the |partyu| length (in bytes). 178 * |partyv| is the optional public info contributed by the responder. 179 * It can be NULL. 180 * |partyv_len| is the |partyv| length (in bytes). 181 * |supp_pub| is the optional additional, mutually-known public information. 182 * It can be NULL. |keylen| should be 0 if this is not NULL. 183 * |supp_pub_len| is the |supp_pub| length (in bytes). 184 * |supp_priv| is the optional additional, mutually-known private information. 185 * It can be NULL. 186 * |supp_priv_len| is the |supp_priv| length (in bytes). 187 * |der| is the returned encoded data. It must be freed by the caller. 188 * |der_len| is the returned size of the encoded data. 189 * |out_ctr| returns a pointer to the counter data which is embedded inside the 190 * encoded data. This allows the counter bytes to be updated without 191 * re-encoding. 192 * 193 * Returns: 1 if successfully encoded, or 0 otherwise. 194 * Assumptions: |der|, |der_len| & |out_ctr| are not NULL. 195 */ 196 static int 197 x942_encode_otherinfo(size_t keylen, 198 const unsigned char *cek_oid, size_t cek_oid_len, 199 const unsigned char *acvp, size_t acvp_len, 200 const unsigned char *partyu, size_t partyu_len, 201 const unsigned char *partyv, size_t partyv_len, 202 const unsigned char *supp_pub, size_t supp_pub_len, 203 const unsigned char *supp_priv, size_t supp_priv_len, 204 unsigned char **der, size_t *der_len, 205 unsigned char **out_ctr) 206 { 207 int ret = 0; 208 unsigned char *pcounter = NULL, *der_buf = NULL; 209 size_t der_buflen = 0; 210 WPACKET pkt; 211 uint32_t keylen_bits; 212 213 /* keylenbits must fit into 4 bytes */ 214 if (keylen > 0xFFFFFF) 215 return 0; 216 keylen_bits = 8 * keylen; 217 218 /* Calculate the size of the buffer */ 219 if (!der_encode_sharedinfo(&pkt, NULL, 0, cek_oid, cek_oid_len, 220 acvp, acvp_len, 221 partyu, partyu_len, partyv, partyv_len, 222 supp_pub, supp_pub_len, supp_priv, supp_priv_len, 223 keylen_bits, NULL) 224 || !WPACKET_get_total_written(&pkt, &der_buflen)) 225 goto err; 226 WPACKET_cleanup(&pkt); 227 /* Alloc the buffer */ 228 der_buf = OPENSSL_zalloc(der_buflen); 229 if (der_buf == NULL) 230 goto err; 231 /* Encode into the buffer */ 232 if (!der_encode_sharedinfo(&pkt, der_buf, der_buflen, cek_oid, cek_oid_len, 233 acvp, acvp_len, 234 partyu, partyu_len, partyv, partyv_len, 235 supp_pub, supp_pub_len, supp_priv, supp_priv_len, 236 keylen_bits, &pcounter)) 237 goto err; 238 /* 239 * Since we allocated the exact size required, the buffer should point to the 240 * start of the alllocated buffer at this point. 241 */ 242 if (WPACKET_get_curr(&pkt) != der_buf) 243 goto err; 244 245 /* 246 * The data for the DER encoded octet string of a 32 bit counter = 1 247 * should be 04 04 00 00 00 01 248 * So just check the header is correct and skip over it. 249 * This counter will be incremented in the kdf update loop. 250 */ 251 if (pcounter == NULL 252 || pcounter[0] != 0x04 253 || pcounter[1] != 0x04) 254 goto err; 255 *out_ctr = (pcounter + 2); 256 *der = der_buf; 257 *der_len = der_buflen; 258 ret = 1; 259 err: 260 WPACKET_cleanup(&pkt); 261 return ret; 262 } 263 264 static int x942kdf_hash_kdm(const EVP_MD *kdf_md, 265 const unsigned char *z, size_t z_len, 266 const unsigned char *other, size_t other_len, 267 unsigned char *ctr, 268 unsigned char *derived_key, size_t derived_key_len) 269 { 270 int ret = 0, hlen; 271 size_t counter, out_len, len = derived_key_len; 272 unsigned char mac[EVP_MAX_MD_SIZE]; 273 unsigned char *out = derived_key; 274 EVP_MD_CTX *ctx = NULL, *ctx_init = NULL; 275 276 if (z_len > X942KDF_MAX_INLEN 277 || other_len > X942KDF_MAX_INLEN 278 || derived_key_len > X942KDF_MAX_INLEN 279 || derived_key_len == 0) { 280 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH); 281 return 0; 282 } 283 284 hlen = EVP_MD_get_size(kdf_md); 285 if (hlen <= 0) 286 return 0; 287 out_len = (size_t)hlen; 288 289 ctx = EVP_MD_CTX_create(); 290 ctx_init = EVP_MD_CTX_create(); 291 if (ctx == NULL || ctx_init == NULL) 292 goto end; 293 294 if (!EVP_DigestInit(ctx_init, kdf_md)) 295 goto end; 296 297 for (counter = 1;; counter++) { 298 /* updating the ctr modifies 4 bytes in the 'other' buffer */ 299 ctr[0] = (unsigned char)((counter >> 24) & 0xff); 300 ctr[1] = (unsigned char)((counter >> 16) & 0xff); 301 ctr[2] = (unsigned char)((counter >> 8) & 0xff); 302 ctr[3] = (unsigned char)(counter & 0xff); 303 304 if (!EVP_MD_CTX_copy_ex(ctx, ctx_init) 305 || !EVP_DigestUpdate(ctx, z, z_len) 306 || !EVP_DigestUpdate(ctx, other, other_len)) 307 goto end; 308 if (len >= out_len) { 309 if (!EVP_DigestFinal_ex(ctx, out, NULL)) 310 goto end; 311 out += out_len; 312 len -= out_len; 313 if (len == 0) 314 break; 315 } else { 316 if (!EVP_DigestFinal_ex(ctx, mac, NULL)) 317 goto end; 318 memcpy(out, mac, len); 319 break; 320 } 321 } 322 ret = 1; 323 end: 324 EVP_MD_CTX_free(ctx); 325 EVP_MD_CTX_free(ctx_init); 326 OPENSSL_cleanse(mac, sizeof(mac)); 327 return ret; 328 } 329 330 static void *x942kdf_new(void *provctx) 331 { 332 KDF_X942 *ctx; 333 334 if (!ossl_prov_is_running()) 335 return NULL; 336 337 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) { 338 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); 339 return NULL; 340 } 341 ctx->provctx = provctx; 342 ctx->use_keybits = 1; 343 return ctx; 344 } 345 346 static void x942kdf_reset(void *vctx) 347 { 348 KDF_X942 *ctx = (KDF_X942 *)vctx; 349 void *provctx = ctx->provctx; 350 351 ossl_prov_digest_reset(&ctx->digest); 352 OPENSSL_clear_free(ctx->secret, ctx->secret_len); 353 OPENSSL_clear_free(ctx->acvpinfo, ctx->acvpinfo_len); 354 OPENSSL_clear_free(ctx->partyuinfo, ctx->partyuinfo_len); 355 OPENSSL_clear_free(ctx->partyvinfo, ctx->partyvinfo_len); 356 OPENSSL_clear_free(ctx->supp_pubinfo, ctx->supp_pubinfo_len); 357 OPENSSL_clear_free(ctx->supp_privinfo, ctx->supp_privinfo_len); 358 memset(ctx, 0, sizeof(*ctx)); 359 ctx->provctx = provctx; 360 ctx->use_keybits = 1; 361 } 362 363 static void x942kdf_free(void *vctx) 364 { 365 KDF_X942 *ctx = (KDF_X942 *)vctx; 366 367 if (ctx != NULL) { 368 x942kdf_reset(ctx); 369 OPENSSL_free(ctx); 370 } 371 } 372 373 static int x942kdf_set_buffer(unsigned char **out, size_t *out_len, 374 const OSSL_PARAM *p) 375 { 376 if (p->data_size == 0 || p->data == NULL) 377 return 1; 378 379 OPENSSL_free(*out); 380 *out = NULL; 381 return OSSL_PARAM_get_octet_string(p, (void **)out, 0, out_len); 382 } 383 384 static size_t x942kdf_size(KDF_X942 *ctx) 385 { 386 int len; 387 const EVP_MD *md = ossl_prov_digest_md(&ctx->digest); 388 389 if (md == NULL) { 390 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST); 391 return 0; 392 } 393 len = EVP_MD_get_size(md); 394 return (len <= 0) ? 0 : (size_t)len; 395 } 396 397 static int x942kdf_derive(void *vctx, unsigned char *key, size_t keylen, 398 const OSSL_PARAM params[]) 399 { 400 KDF_X942 *ctx = (KDF_X942 *)vctx; 401 const EVP_MD *md; 402 int ret = 0; 403 unsigned char *ctr; 404 unsigned char *der = NULL; 405 size_t der_len = 0; 406 407 if (!ossl_prov_is_running() || !x942kdf_set_ctx_params(ctx, params)) 408 return 0; 409 410 /* 411 * These 2 options encode to the same field so only one of them should be 412 * active at once. 413 */ 414 if (ctx->use_keybits && ctx->supp_pubinfo != NULL) { 415 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PUBINFO); 416 return 0; 417 } 418 /* 419 * If the blob of acvp data is used then the individual info fields that it 420 * replaces should not also be defined. 421 */ 422 if (ctx->acvpinfo != NULL 423 && (ctx->partyuinfo != NULL 424 || ctx->partyvinfo != NULL 425 || ctx->supp_pubinfo != NULL 426 || ctx->supp_privinfo != NULL)) { 427 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA); 428 return 0; 429 } 430 if (ctx->secret == NULL) { 431 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SECRET); 432 return 0; 433 } 434 md = ossl_prov_digest_md(&ctx->digest); 435 if (md == NULL) { 436 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST); 437 return 0; 438 } 439 if (ctx->cek_oid == NULL || ctx->cek_oid_len == 0) { 440 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_CEK_ALG); 441 return 0; 442 } 443 if (ctx->partyuinfo != NULL && ctx->partyuinfo_len >= X942KDF_MAX_INLEN) { 444 /* 445 * Note the ukm length MUST be 512 bits if it is used. 446 * For backwards compatibility the old check is being done. 447 */ 448 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_UKM_LENGTH); 449 return 0; 450 } 451 /* generate the otherinfo der */ 452 if (!x942_encode_otherinfo(ctx->use_keybits ? ctx->dkm_len : 0, 453 ctx->cek_oid, ctx->cek_oid_len, 454 ctx->acvpinfo, ctx->acvpinfo_len, 455 ctx->partyuinfo, ctx->partyuinfo_len, 456 ctx->partyvinfo, ctx->partyvinfo_len, 457 ctx->supp_pubinfo, ctx->supp_pubinfo_len, 458 ctx->supp_privinfo, ctx->supp_privinfo_len, 459 &der, &der_len, &ctr)) { 460 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_ENCODING); 461 return 0; 462 } 463 ret = x942kdf_hash_kdm(md, ctx->secret, ctx->secret_len, 464 der, der_len, ctr, key, keylen); 465 OPENSSL_free(der); 466 return ret; 467 } 468 469 static int x942kdf_set_ctx_params(void *vctx, const OSSL_PARAM params[]) 470 { 471 const OSSL_PARAM *p, *pq; 472 KDF_X942 *ctx = vctx; 473 OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx); 474 const char *propq = NULL; 475 size_t id; 476 477 if (params == NULL) 478 return 1; 479 if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx)) 480 return 0; 481 482 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SECRET); 483 if (p == NULL) 484 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY); 485 if (p != NULL && !x942kdf_set_buffer(&ctx->secret, &ctx->secret_len, p)) 486 return 0; 487 488 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_X942_ACVPINFO); 489 if (p != NULL 490 && !x942kdf_set_buffer(&ctx->acvpinfo, &ctx->acvpinfo_len, p)) 491 return 0; 492 493 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_X942_PARTYUINFO); 494 if (p == NULL) 495 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_UKM); 496 if (p != NULL 497 && !x942kdf_set_buffer(&ctx->partyuinfo, &ctx->partyuinfo_len, p)) 498 return 0; 499 500 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_X942_PARTYVINFO); 501 if (p != NULL 502 && !x942kdf_set_buffer(&ctx->partyvinfo, &ctx->partyvinfo_len, p)) 503 return 0; 504 505 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_X942_USE_KEYBITS); 506 if (p != NULL && !OSSL_PARAM_get_int(p, &ctx->use_keybits)) 507 return 0; 508 509 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_X942_SUPP_PUBINFO); 510 if (p != NULL) { 511 if (!x942kdf_set_buffer(&ctx->supp_pubinfo, &ctx->supp_pubinfo_len, p)) 512 return 0; 513 ctx->use_keybits = 0; 514 } 515 516 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_X942_SUPP_PRIVINFO); 517 if (p != NULL 518 && !x942kdf_set_buffer(&ctx->supp_privinfo, &ctx->supp_privinfo_len, p)) 519 return 0; 520 521 p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_CEK_ALG); 522 if (p != NULL) { 523 if (p->data_type != OSSL_PARAM_UTF8_STRING) 524 return 0; 525 pq = OSSL_PARAM_locate_const(params, OSSL_ALG_PARAM_PROPERTIES); 526 /* 527 * We already grab the properties during ossl_prov_digest_load_from_params() 528 * so there is no need to check the validity again.. 529 */ 530 if (pq != NULL) 531 propq = p->data; 532 if (find_alg_id(provctx, p->data, propq, &id) == 0) 533 return 0; 534 ctx->cek_oid = kek_algs[id].oid; 535 ctx->cek_oid_len = kek_algs[id].oid_len; 536 ctx->dkm_len = kek_algs[id].keklen; 537 } 538 return 1; 539 } 540 541 static const OSSL_PARAM *x942kdf_settable_ctx_params(ossl_unused void *ctx, 542 ossl_unused void *provctx) 543 { 544 static const OSSL_PARAM known_settable_ctx_params[] = { 545 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0), 546 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0), 547 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SECRET, NULL, 0), 548 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_KEY, NULL, 0), 549 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_UKM, NULL, 0), 550 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_X942_ACVPINFO, NULL, 0), 551 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_X942_PARTYUINFO, NULL, 0), 552 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_X942_PARTYVINFO, NULL, 0), 553 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_X942_SUPP_PUBINFO, NULL, 0), 554 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_X942_SUPP_PRIVINFO, NULL, 0), 555 OSSL_PARAM_int(OSSL_KDF_PARAM_X942_USE_KEYBITS, NULL), 556 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_CEK_ALG, NULL, 0), 557 OSSL_PARAM_END 558 }; 559 return known_settable_ctx_params; 560 } 561 562 static int x942kdf_get_ctx_params(void *vctx, OSSL_PARAM params[]) 563 { 564 KDF_X942 *ctx = (KDF_X942 *)vctx; 565 OSSL_PARAM *p; 566 567 if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL) 568 return OSSL_PARAM_set_size_t(p, x942kdf_size(ctx)); 569 return -2; 570 } 571 572 static const OSSL_PARAM *x942kdf_gettable_ctx_params(ossl_unused void *ctx, 573 ossl_unused void *provctx) 574 { 575 static const OSSL_PARAM known_gettable_ctx_params[] = { 576 OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL), 577 OSSL_PARAM_END 578 }; 579 return known_gettable_ctx_params; 580 } 581 582 const OSSL_DISPATCH ossl_kdf_x942_kdf_functions[] = { 583 { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))x942kdf_new }, 584 { OSSL_FUNC_KDF_FREECTX, (void(*)(void))x942kdf_free }, 585 { OSSL_FUNC_KDF_RESET, (void(*)(void))x942kdf_reset }, 586 { OSSL_FUNC_KDF_DERIVE, (void(*)(void))x942kdf_derive }, 587 { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS, 588 (void(*)(void))x942kdf_settable_ctx_params }, 589 { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))x942kdf_set_ctx_params }, 590 { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS, 591 (void(*)(void))x942kdf_gettable_ctx_params }, 592 { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))x942kdf_get_ctx_params }, 593 { 0, NULL } 594 }; 595