1 /* 2 * Copyright 2011-2024 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <assert.h> 11 #include <stdlib.h> 12 #include <string.h> 13 #include <openssl/sha.h> 14 #include <openssl/crypto.h> 15 #include <openssl/err.h> 16 #include <openssl/rand.h> 17 #include <openssl/core_dispatch.h> 18 #include <openssl/proverr.h> 19 #include "internal/thread_once.h" 20 #include "prov/providercommon.h" 21 #include "prov/provider_ctx.h" 22 #include "prov/provider_util.h" 23 #include "prov/implementations.h" 24 #include "drbg_local.h" 25 26 static OSSL_FUNC_rand_newctx_fn drbg_hash_new_wrapper; 27 static OSSL_FUNC_rand_freectx_fn drbg_hash_free; 28 static OSSL_FUNC_rand_instantiate_fn drbg_hash_instantiate_wrapper; 29 static OSSL_FUNC_rand_uninstantiate_fn drbg_hash_uninstantiate_wrapper; 30 static OSSL_FUNC_rand_generate_fn drbg_hash_generate_wrapper; 31 static OSSL_FUNC_rand_reseed_fn drbg_hash_reseed_wrapper; 32 static OSSL_FUNC_rand_settable_ctx_params_fn drbg_hash_settable_ctx_params; 33 static OSSL_FUNC_rand_set_ctx_params_fn drbg_hash_set_ctx_params; 34 static OSSL_FUNC_rand_gettable_ctx_params_fn drbg_hash_gettable_ctx_params; 35 static OSSL_FUNC_rand_get_ctx_params_fn drbg_hash_get_ctx_params; 36 static OSSL_FUNC_rand_verify_zeroization_fn drbg_hash_verify_zeroization; 37 38 /* 888 bits from SP800-90Ar1 10.1 table 2 */ 39 #define HASH_PRNG_MAX_SEEDLEN (888/8) 40 41 /* 440 bits from SP800-90Ar1 10.1 table 2 */ 42 #define HASH_PRNG_SMALL_SEEDLEN (440/8) 43 44 /* Determine what seedlen to use based on the block length */ 45 #define MAX_BLOCKLEN_USING_SMALL_SEEDLEN (256/8) 46 #define INBYTE_IGNORE ((unsigned char)0xFF) 47 48 typedef struct rand_drbg_hash_st { 49 PROV_DIGEST digest; 50 EVP_MD_CTX *ctx; 51 size_t blocklen; 52 unsigned char V[HASH_PRNG_MAX_SEEDLEN]; 53 unsigned char C[HASH_PRNG_MAX_SEEDLEN]; 54 /* Temporary value storage: should always exceed max digest length */ 55 unsigned char vtmp[HASH_PRNG_MAX_SEEDLEN]; 56 } PROV_DRBG_HASH; 57 58 /* 59 * SP800-90Ar1 10.3.1 Derivation function using a Hash Function (Hash_df). 60 * The input string used is composed of: 61 * inbyte - An optional leading byte (ignore if equal to INBYTE_IGNORE) 62 * in - input string 1 (A Non NULL value). 63 * in2 - optional input string (Can be NULL). 64 * in3 - optional input string (Can be NULL). 65 * These are concatenated as part of the DigestUpdate process. 66 */ 67 static int hash_df(PROV_DRBG *drbg, unsigned char *out, 68 const unsigned char inbyte, 69 const unsigned char *in, size_t inlen, 70 const unsigned char *in2, size_t in2len, 71 const unsigned char *in3, size_t in3len) 72 { 73 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 74 EVP_MD_CTX *ctx = hash->ctx; 75 unsigned char *vtmp = hash->vtmp; 76 /* tmp = counter || num_bits_returned || [inbyte] */ 77 unsigned char tmp[1 + 4 + 1]; 78 int tmp_sz = 0; 79 size_t outlen = drbg->seedlen; 80 size_t num_bits_returned = outlen * 8; 81 /* 82 * No need to check outlen size here, as the standard only ever needs 83 * seedlen bytes which is always less than the maximum permitted. 84 */ 85 86 /* (Step 3) counter = 1 (tmp[0] is the 8 bit counter) */ 87 tmp[tmp_sz++] = 1; 88 /* tmp[1..4] is the fixed 32 bit no_of_bits_to_return */ 89 tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 24) & 0xff); 90 tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 16) & 0xff); 91 tmp[tmp_sz++] = (unsigned char)((num_bits_returned >> 8) & 0xff); 92 tmp[tmp_sz++] = (unsigned char)(num_bits_returned & 0xff); 93 /* Tack the additional input byte onto the end of tmp if it exists */ 94 if (inbyte != INBYTE_IGNORE) 95 tmp[tmp_sz++] = inbyte; 96 97 /* (Step 4) */ 98 for (;;) { 99 /* 100 * (Step 4.1) out = out || Hash(tmp || in || [in2] || [in3]) 101 * (where tmp = counter || num_bits_returned || [inbyte]) 102 */ 103 if (!(EVP_DigestInit_ex(ctx, ossl_prov_digest_md(&hash->digest), NULL) 104 && EVP_DigestUpdate(ctx, tmp, tmp_sz) 105 && EVP_DigestUpdate(ctx, in, inlen) 106 && (in2 == NULL || EVP_DigestUpdate(ctx, in2, in2len)) 107 && (in3 == NULL || EVP_DigestUpdate(ctx, in3, in3len)))) 108 return 0; 109 110 if (outlen < hash->blocklen) { 111 if (!EVP_DigestFinal(ctx, vtmp, NULL)) 112 return 0; 113 memcpy(out, vtmp, outlen); 114 OPENSSL_cleanse(vtmp, hash->blocklen); 115 break; 116 } else if(!EVP_DigestFinal(ctx, out, NULL)) { 117 return 0; 118 } 119 120 outlen -= hash->blocklen; 121 if (outlen == 0) 122 break; 123 /* (Step 4.2) counter++ */ 124 tmp[0]++; 125 out += hash->blocklen; 126 } 127 return 1; 128 } 129 130 /* Helper function that just passes 2 input parameters to hash_df() */ 131 static int hash_df1(PROV_DRBG *drbg, unsigned char *out, 132 const unsigned char in_byte, 133 const unsigned char *in1, size_t in1len) 134 { 135 return hash_df(drbg, out, in_byte, in1, in1len, NULL, 0, NULL, 0); 136 } 137 138 /* 139 * Add 2 byte buffers together. The first elements in each buffer are the top 140 * most bytes. The result is stored in the dst buffer. 141 * The final carry is ignored i.e: dst = (dst + in) mod (2^seedlen_bits). 142 * where dst size is drbg->seedlen, and inlen <= drbg->seedlen. 143 */ 144 static int add_bytes(PROV_DRBG *drbg, unsigned char *dst, 145 unsigned char *in, size_t inlen) 146 { 147 size_t i; 148 int result; 149 const unsigned char *add; 150 unsigned char carry = 0, *d; 151 152 assert(drbg->seedlen >= 1 && inlen >= 1 && inlen <= drbg->seedlen); 153 154 d = &dst[drbg->seedlen - 1]; 155 add = &in[inlen - 1]; 156 157 for (i = inlen; i > 0; i--, d--, add--) { 158 result = *d + *add + carry; 159 carry = (unsigned char)(result >> 8); 160 *d = (unsigned char)(result & 0xff); 161 } 162 163 if (carry != 0) { 164 /* Add the carry to the top of the dst if inlen is not the same size */ 165 for (i = drbg->seedlen - inlen; i > 0; --i, d--) { 166 *d += 1; /* Carry can only be 1 */ 167 if (*d != 0) /* exit if carry doesnt propagate to the next byte */ 168 break; 169 } 170 } 171 return 1; 172 } 173 174 /* V = (V + Hash(inbyte || V || [additional_input]) mod (2^seedlen) */ 175 static int add_hash_to_v(PROV_DRBG *drbg, unsigned char inbyte, 176 const unsigned char *adin, size_t adinlen) 177 { 178 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 179 EVP_MD_CTX *ctx = hash->ctx; 180 181 return EVP_DigestInit_ex(ctx, ossl_prov_digest_md(&hash->digest), NULL) 182 && EVP_DigestUpdate(ctx, &inbyte, 1) 183 && EVP_DigestUpdate(ctx, hash->V, drbg->seedlen) 184 && (adin == NULL || EVP_DigestUpdate(ctx, adin, adinlen)) 185 && EVP_DigestFinal(ctx, hash->vtmp, NULL) 186 && add_bytes(drbg, hash->V, hash->vtmp, hash->blocklen); 187 } 188 189 /* 190 * The Hashgen() as listed in SP800-90Ar1 10.1.1.4 Hash_DRBG_Generate_Process. 191 * 192 * drbg contains the current value of V. 193 * outlen is the requested number of bytes. 194 * out is a buffer to return the generated bits. 195 * 196 * The algorithm to generate the bits is: 197 * data = V 198 * w = NULL 199 * for (i = 1 to m) { 200 * W = W || Hash(data) 201 * data = (data + 1) mod (2^seedlen) 202 * } 203 * out = Leftmost(W, outlen) 204 * 205 * Returns zero if an error occurs otherwise it returns 1. 206 */ 207 static int hash_gen(PROV_DRBG *drbg, unsigned char *out, size_t outlen) 208 { 209 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 210 unsigned char one = 1; 211 212 if (outlen == 0) 213 return 1; 214 memcpy(hash->vtmp, hash->V, drbg->seedlen); 215 for(;;) { 216 if (!EVP_DigestInit_ex(hash->ctx, ossl_prov_digest_md(&hash->digest), 217 NULL) 218 || !EVP_DigestUpdate(hash->ctx, hash->vtmp, drbg->seedlen)) 219 return 0; 220 221 if (outlen < hash->blocklen) { 222 if (!EVP_DigestFinal(hash->ctx, hash->vtmp, NULL)) 223 return 0; 224 memcpy(out, hash->vtmp, outlen); 225 return 1; 226 } else { 227 if (!EVP_DigestFinal(hash->ctx, out, NULL)) 228 return 0; 229 outlen -= hash->blocklen; 230 if (outlen == 0) 231 break; 232 out += hash->blocklen; 233 } 234 add_bytes(drbg, hash->vtmp, &one, 1); 235 } 236 return 1; 237 } 238 239 /* 240 * SP800-90Ar1 10.1.1.2 Hash_DRBG_Instantiate_Process: 241 * 242 * ent is entropy input obtained from a randomness source of length ent_len. 243 * nonce is a string of bytes of length nonce_len. 244 * pstr is a personalization string received from an application. May be NULL. 245 * 246 * Returns zero if an error occurs otherwise it returns 1. 247 */ 248 static int drbg_hash_instantiate(PROV_DRBG *drbg, 249 const unsigned char *ent, size_t ent_len, 250 const unsigned char *nonce, size_t nonce_len, 251 const unsigned char *pstr, size_t pstr_len) 252 { 253 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 254 255 EVP_MD_CTX_free(hash->ctx); 256 hash->ctx = EVP_MD_CTX_new(); 257 258 /* (Step 1-3) V = Hash_df(entropy||nonce||pers, seedlen) */ 259 return hash->ctx != NULL 260 && hash_df(drbg, hash->V, INBYTE_IGNORE, 261 ent, ent_len, nonce, nonce_len, pstr, pstr_len) 262 /* (Step 4) C = Hash_df(0x00||V, seedlen) */ 263 && hash_df1(drbg, hash->C, 0x00, hash->V, drbg->seedlen); 264 } 265 266 static int drbg_hash_instantiate_wrapper(void *vdrbg, unsigned int strength, 267 int prediction_resistance, 268 const unsigned char *pstr, 269 size_t pstr_len, 270 const OSSL_PARAM params[]) 271 { 272 PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; 273 274 if (!ossl_prov_is_running() || !drbg_hash_set_ctx_params(drbg, params)) 275 return 0; 276 return ossl_prov_drbg_instantiate(drbg, strength, prediction_resistance, 277 pstr, pstr_len); 278 } 279 280 /* 281 * SP800-90Ar1 10.1.1.3 Hash_DRBG_Reseed_Process: 282 * 283 * ent is entropy input bytes obtained from a randomness source. 284 * addin is additional input received from an application. May be NULL. 285 * 286 * Returns zero if an error occurs otherwise it returns 1. 287 */ 288 static int drbg_hash_reseed(PROV_DRBG *drbg, 289 const unsigned char *ent, size_t ent_len, 290 const unsigned char *adin, size_t adin_len) 291 { 292 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 293 294 /* (Step 1-2) V = Hash_df(0x01 || V || entropy_input || additional_input) */ 295 /* V about to be updated so use C as output instead */ 296 if (!hash_df(drbg, hash->C, 0x01, hash->V, drbg->seedlen, ent, ent_len, 297 adin, adin_len)) 298 return 0; 299 memcpy(hash->V, hash->C, drbg->seedlen); 300 /* (Step 4) C = Hash_df(0x00||V, seedlen) */ 301 return hash_df1(drbg, hash->C, 0x00, hash->V, drbg->seedlen); 302 } 303 304 static int drbg_hash_reseed_wrapper(void *vdrbg, int prediction_resistance, 305 const unsigned char *ent, size_t ent_len, 306 const unsigned char *adin, size_t adin_len) 307 { 308 PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; 309 310 return ossl_prov_drbg_reseed(drbg, prediction_resistance, ent, ent_len, 311 adin, adin_len); 312 } 313 314 /* 315 * SP800-90Ar1 10.1.1.4 Hash_DRBG_Generate_Process: 316 * 317 * Generates pseudo random bytes using the drbg. 318 * out is a buffer to fill with outlen bytes of pseudo random data. 319 * addin is additional input received from an application. May be NULL. 320 * 321 * Returns zero if an error occurs otherwise it returns 1. 322 */ 323 static int drbg_hash_generate(PROV_DRBG *drbg, 324 unsigned char *out, size_t outlen, 325 const unsigned char *adin, size_t adin_len) 326 { 327 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 328 unsigned char counter[4]; 329 int reseed_counter = drbg->generate_counter; 330 331 counter[0] = (unsigned char)((reseed_counter >> 24) & 0xff); 332 counter[1] = (unsigned char)((reseed_counter >> 16) & 0xff); 333 counter[2] = (unsigned char)((reseed_counter >> 8) & 0xff); 334 counter[3] = (unsigned char)(reseed_counter & 0xff); 335 336 return hash->ctx != NULL 337 && (adin == NULL 338 /* (Step 2) if adin != NULL then V = V + Hash(0x02||V||adin) */ 339 || adin_len == 0 340 || add_hash_to_v(drbg, 0x02, adin, adin_len)) 341 /* (Step 3) Hashgen(outlen, V) */ 342 && hash_gen(drbg, out, outlen) 343 /* (Step 4/5) H = V = (V + Hash(0x03||V) mod (2^seedlen_bits) */ 344 && add_hash_to_v(drbg, 0x03, NULL, 0) 345 /* (Step 5) V = (V + H + C + reseed_counter) mod (2^seedlen_bits) */ 346 /* V = (V + C) mod (2^seedlen_bits) */ 347 && add_bytes(drbg, hash->V, hash->C, drbg->seedlen) 348 /* V = (V + reseed_counter) mod (2^seedlen_bits) */ 349 && add_bytes(drbg, hash->V, counter, 4); 350 } 351 352 static int drbg_hash_generate_wrapper 353 (void *vdrbg, unsigned char *out, size_t outlen, unsigned int strength, 354 int prediction_resistance, const unsigned char *adin, size_t adin_len) 355 { 356 PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; 357 358 return ossl_prov_drbg_generate(drbg, out, outlen, strength, 359 prediction_resistance, adin, adin_len); 360 } 361 362 static int drbg_hash_uninstantiate(PROV_DRBG *drbg) 363 { 364 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 365 366 OPENSSL_cleanse(hash->V, sizeof(hash->V)); 367 OPENSSL_cleanse(hash->C, sizeof(hash->C)); 368 OPENSSL_cleanse(hash->vtmp, sizeof(hash->vtmp)); 369 return ossl_prov_drbg_uninstantiate(drbg); 370 } 371 372 static int drbg_hash_uninstantiate_wrapper(void *vdrbg) 373 { 374 return drbg_hash_uninstantiate((PROV_DRBG *)vdrbg); 375 } 376 377 static int drbg_hash_verify_zeroization(void *vdrbg) 378 { 379 PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; 380 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 381 382 PROV_DRBG_VERYIFY_ZEROIZATION(hash->V); 383 PROV_DRBG_VERYIFY_ZEROIZATION(hash->C); 384 PROV_DRBG_VERYIFY_ZEROIZATION(hash->vtmp); 385 return 1; 386 } 387 388 static int drbg_hash_new(PROV_DRBG *ctx) 389 { 390 PROV_DRBG_HASH *hash; 391 392 hash = OPENSSL_secure_zalloc(sizeof(*hash)); 393 if (hash == NULL) { 394 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); 395 return 0; 396 } 397 398 ctx->data = hash; 399 ctx->seedlen = HASH_PRNG_MAX_SEEDLEN; 400 ctx->max_entropylen = DRBG_MAX_LENGTH; 401 ctx->max_noncelen = DRBG_MAX_LENGTH; 402 ctx->max_perslen = DRBG_MAX_LENGTH; 403 ctx->max_adinlen = DRBG_MAX_LENGTH; 404 405 /* Maximum number of bits per request = 2^19 = 2^16 bytes */ 406 ctx->max_request = 1 << 16; 407 return 1; 408 } 409 410 static void *drbg_hash_new_wrapper(void *provctx, void *parent, 411 const OSSL_DISPATCH *parent_dispatch) 412 { 413 return ossl_rand_drbg_new(provctx, parent, parent_dispatch, 414 &drbg_hash_new, &drbg_hash_free, 415 &drbg_hash_instantiate, &drbg_hash_uninstantiate, 416 &drbg_hash_reseed, &drbg_hash_generate); 417 } 418 419 static void drbg_hash_free(void *vdrbg) 420 { 421 PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; 422 PROV_DRBG_HASH *hash; 423 424 if (drbg != NULL && (hash = (PROV_DRBG_HASH *)drbg->data) != NULL) { 425 EVP_MD_CTX_free(hash->ctx); 426 ossl_prov_digest_reset(&hash->digest); 427 OPENSSL_secure_clear_free(hash, sizeof(*hash)); 428 } 429 ossl_rand_drbg_free(drbg); 430 } 431 432 static int drbg_hash_get_ctx_params(void *vdrbg, OSSL_PARAM params[]) 433 { 434 PROV_DRBG *drbg = (PROV_DRBG *)vdrbg; 435 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)drbg->data; 436 const EVP_MD *md; 437 OSSL_PARAM *p; 438 439 p = OSSL_PARAM_locate(params, OSSL_DRBG_PARAM_DIGEST); 440 if (p != NULL) { 441 md = ossl_prov_digest_md(&hash->digest); 442 if (md == NULL || !OSSL_PARAM_set_utf8_string(p, EVP_MD_get0_name(md))) 443 return 0; 444 } 445 446 return ossl_drbg_get_ctx_params(drbg, params); 447 } 448 449 static const OSSL_PARAM *drbg_hash_gettable_ctx_params(ossl_unused void *vctx, 450 ossl_unused void *p_ctx) 451 { 452 static const OSSL_PARAM known_gettable_ctx_params[] = { 453 OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0), 454 OSSL_PARAM_DRBG_GETTABLE_CTX_COMMON, 455 OSSL_PARAM_END 456 }; 457 return known_gettable_ctx_params; 458 } 459 460 static int drbg_hash_set_ctx_params(void *vctx, const OSSL_PARAM params[]) 461 { 462 PROV_DRBG *ctx = (PROV_DRBG *)vctx; 463 PROV_DRBG_HASH *hash = (PROV_DRBG_HASH *)ctx->data; 464 OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx); 465 const EVP_MD *md; 466 467 if (!ossl_prov_digest_load_from_params(&hash->digest, params, libctx)) 468 return 0; 469 470 md = ossl_prov_digest_md(&hash->digest); 471 if (md != NULL) { 472 if ((EVP_MD_get_flags(md) & EVP_MD_FLAG_XOF) != 0) { 473 ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED); 474 return 0; 475 } 476 477 /* These are taken from SP 800-90 10.1 Table 2 */ 478 hash->blocklen = EVP_MD_get_size(md); 479 /* See SP800-57 Part1 Rev4 5.6.1 Table 3 */ 480 ctx->strength = 64 * (hash->blocklen >> 3); 481 if (ctx->strength > 256) 482 ctx->strength = 256; 483 if (hash->blocklen > MAX_BLOCKLEN_USING_SMALL_SEEDLEN) 484 ctx->seedlen = HASH_PRNG_MAX_SEEDLEN; 485 else 486 ctx->seedlen = HASH_PRNG_SMALL_SEEDLEN; 487 488 ctx->min_entropylen = ctx->strength / 8; 489 ctx->min_noncelen = ctx->min_entropylen / 2; 490 } 491 492 return ossl_drbg_set_ctx_params(ctx, params); 493 } 494 495 static const OSSL_PARAM *drbg_hash_settable_ctx_params(ossl_unused void *vctx, 496 ossl_unused void *p_ctx) 497 { 498 static const OSSL_PARAM known_settable_ctx_params[] = { 499 OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_PROPERTIES, NULL, 0), 500 OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0), 501 OSSL_PARAM_DRBG_SETTABLE_CTX_COMMON, 502 OSSL_PARAM_END 503 }; 504 return known_settable_ctx_params; 505 } 506 507 const OSSL_DISPATCH ossl_drbg_hash_functions[] = { 508 { OSSL_FUNC_RAND_NEWCTX, (void(*)(void))drbg_hash_new_wrapper }, 509 { OSSL_FUNC_RAND_FREECTX, (void(*)(void))drbg_hash_free }, 510 { OSSL_FUNC_RAND_INSTANTIATE, 511 (void(*)(void))drbg_hash_instantiate_wrapper }, 512 { OSSL_FUNC_RAND_UNINSTANTIATE, 513 (void(*)(void))drbg_hash_uninstantiate_wrapper }, 514 { OSSL_FUNC_RAND_GENERATE, (void(*)(void))drbg_hash_generate_wrapper }, 515 { OSSL_FUNC_RAND_RESEED, (void(*)(void))drbg_hash_reseed_wrapper }, 516 { OSSL_FUNC_RAND_ENABLE_LOCKING, (void(*)(void))ossl_drbg_enable_locking }, 517 { OSSL_FUNC_RAND_LOCK, (void(*)(void))ossl_drbg_lock }, 518 { OSSL_FUNC_RAND_UNLOCK, (void(*)(void))ossl_drbg_unlock }, 519 { OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS, 520 (void(*)(void))drbg_hash_settable_ctx_params }, 521 { OSSL_FUNC_RAND_SET_CTX_PARAMS, (void(*)(void))drbg_hash_set_ctx_params }, 522 { OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS, 523 (void(*)(void))drbg_hash_gettable_ctx_params }, 524 { OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))drbg_hash_get_ctx_params }, 525 { OSSL_FUNC_RAND_VERIFY_ZEROIZATION, 526 (void(*)(void))drbg_hash_verify_zeroization }, 527 { OSSL_FUNC_RAND_GET_SEED, (void(*)(void))ossl_drbg_get_seed }, 528 { OSSL_FUNC_RAND_CLEAR_SEED, (void(*)(void))ossl_drbg_clear_seed }, 529 { 0, NULL } 530 }; 531