2 * Copyright 2016-2023 The OpenSSL Project Authors. All Rights Reserved.
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
11 * HMAC low level APIs are deprecated for public use, but still ok for internal
14 #include "internal/deprecated.h"
19 #include <openssl/hmac.h>
20 #include <openssl/evp.h>
21 #include <openssl/kdf.h>
22 #include <openssl/core_names.h>
23 #include <openssl/proverr.h>
24 #include "internal/cryptlib.h"
25 #include "internal/numbers.h"
26 #include "internal/packet.h"
27 #include "crypto/evp.h"
28 #include "prov/provider_ctx.h"
29 #include "prov/providercommon.h"
30 #include "prov/implementations.h"
31 #include "prov/provider_util.h"
32 #include "internal/e_os.h"
33 #include "internal/params.h"
35 #define HKDF_MAXBUF 2048
36 #define HKDF_MAXINFO (32*1024)
38 static OSSL_FUNC_kdf_newctx_fn kdf_hkdf_new;
39 static OSSL_FUNC_kdf_dupctx_fn kdf_hkdf_dup;
40 static OSSL_FUNC_kdf_freectx_fn kdf_hkdf_free;
41 static OSSL_FUNC_kdf_reset_fn kdf_hkdf_reset;
42 static OSSL_FUNC_kdf_derive_fn kdf_hkdf_derive;
43 static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_hkdf_settable_ctx_params;
44 static OSSL_FUNC_kdf_set_ctx_params_fn kdf_hkdf_set_ctx_params;
45 static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_hkdf_gettable_ctx_params;
46 static OSSL_FUNC_kdf_get_ctx_params_fn kdf_hkdf_get_ctx_params;
47 static OSSL_FUNC_kdf_derive_fn kdf_tls1_3_derive;
48 static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_tls1_3_settable_ctx_params;
49 static OSSL_FUNC_kdf_set_ctx_params_fn kdf_tls1_3_set_ctx_params;
51 static int HKDF(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
52 const unsigned char *salt, size_t salt_len,
53 const unsigned char *key, size_t key_len,
54 const unsigned char *info, size_t info_len,
55 unsigned char *okm, size_t okm_len);
56 static int HKDF_Extract(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
57 const unsigned char *salt, size_t salt_len,
58 const unsigned char *ikm, size_t ikm_len,
59 unsigned char *prk, size_t prk_len);
60 static int HKDF_Expand(const EVP_MD *evp_md,
61 const unsigned char *prk, size_t prk_len,
62 const unsigned char *info, size_t info_len,
63 unsigned char *okm, size_t okm_len);
65 /* Settable context parameters that are common across HKDF and the TLS KDF */
66 #define HKDF_COMMON_SETTABLES \
67 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_MODE, NULL, 0), \
68 OSSL_PARAM_int(OSSL_KDF_PARAM_MODE, NULL), \
69 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0), \
70 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0), \
71 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_KEY, NULL, 0), \
72 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0)
82 unsigned char *prefix;
92 static void *kdf_hkdf_new(void *provctx)
96 if (!ossl_prov_is_running())
99 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) != NULL)
100 ctx->provctx = provctx;
104 static void kdf_hkdf_free(void *vctx)
106 KDF_HKDF *ctx = (KDF_HKDF *)vctx;
114 static void kdf_hkdf_reset(void *vctx)
116 KDF_HKDF *ctx = (KDF_HKDF *)vctx;
117 void *provctx = ctx->provctx;
119 ossl_prov_digest_reset(&ctx->digest);
121 OPENSSL_clear_free(ctx->salt, ctx->salt_len);
123 OPENSSL_free(ctx->salt);
125 OPENSSL_free(ctx->prefix);
126 OPENSSL_free(ctx->label);
127 OPENSSL_clear_free(ctx->data, ctx->data_len);
128 OPENSSL_clear_free(ctx->key, ctx->key_len);
129 OPENSSL_clear_free(ctx->info, ctx->info_len);
130 memset(ctx, 0, sizeof(*ctx));
131 ctx->provctx = provctx;
134 static void *kdf_hkdf_dup(void *vctx)
136 const KDF_HKDF *src = (const KDF_HKDF *)vctx;
139 dest = kdf_hkdf_new(src->provctx);
141 if (!ossl_prov_memdup(src->salt, src->salt_len, &dest->salt,
143 || !ossl_prov_memdup(src->key, src->key_len,
144 &dest->key , &dest->key_len)
145 || !ossl_prov_memdup(src->prefix, src->prefix_len,
146 &dest->prefix, &dest->prefix_len)
147 || !ossl_prov_memdup(src->label, src->label_len,
148 &dest->label, &dest->label_len)
149 || !ossl_prov_memdup(src->data, src->data_len,
150 &dest->data, &dest->data_len)
151 || !ossl_prov_memdup(src->info, src->info_len,
152 &dest->info, &dest->info_len)
153 || !ossl_prov_digest_copy(&dest->digest, &src->digest))
155 dest->mode = src->mode;
164 static size_t kdf_hkdf_size(KDF_HKDF *ctx)
167 const EVP_MD *md = ossl_prov_digest_md(&ctx->digest);
169 if (ctx->mode != EVP_KDF_HKDF_MODE_EXTRACT_ONLY)
173 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
176 sz = EVP_MD_get_size(md);
183 static int kdf_hkdf_derive(void *vctx, unsigned char *key, size_t keylen,
184 const OSSL_PARAM params[])
186 KDF_HKDF *ctx = (KDF_HKDF *)vctx;
187 OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
190 if (!ossl_prov_is_running() || !kdf_hkdf_set_ctx_params(ctx, params))
193 md = ossl_prov_digest_md(&ctx->digest);
195 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
198 if (ctx->key == NULL) {
199 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_KEY);
203 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
208 case EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND:
210 return HKDF(libctx, md, ctx->salt, ctx->salt_len,
211 ctx->key, ctx->key_len, ctx->info, ctx->info_len, key, keylen);
213 case EVP_KDF_HKDF_MODE_EXTRACT_ONLY:
214 return HKDF_Extract(libctx, md, ctx->salt, ctx->salt_len,
215 ctx->key, ctx->key_len, key, keylen);
217 case EVP_KDF_HKDF_MODE_EXPAND_ONLY:
218 return HKDF_Expand(md, ctx->key, ctx->key_len, ctx->info,
219 ctx->info_len, key, keylen);
223 static int hkdf_common_set_ctx_params(KDF_HKDF *ctx, const OSSL_PARAM params[])
225 OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
232 if (!ossl_prov_digest_load_from_params(&ctx->digest, params, libctx))
235 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_MODE)) != NULL) {
236 if (p->data_type == OSSL_PARAM_UTF8_STRING) {
237 if (OPENSSL_strcasecmp(p->data, "EXTRACT_AND_EXPAND") == 0) {
238 ctx->mode = EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND;
239 } else if (OPENSSL_strcasecmp(p->data, "EXTRACT_ONLY") == 0) {
240 ctx->mode = EVP_KDF_HKDF_MODE_EXTRACT_ONLY;
241 } else if (OPENSSL_strcasecmp(p->data, "EXPAND_ONLY") == 0) {
242 ctx->mode = EVP_KDF_HKDF_MODE_EXPAND_ONLY;
244 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
247 } else if (OSSL_PARAM_get_int(p, &n)) {
248 if (n != EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND
249 && n != EVP_KDF_HKDF_MODE_EXTRACT_ONLY
250 && n != EVP_KDF_HKDF_MODE_EXPAND_ONLY) {
251 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
256 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
261 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY)) != NULL) {
262 OPENSSL_clear_free(ctx->key, ctx->key_len);
264 if (!OSSL_PARAM_get_octet_string(p, (void **)&ctx->key, 0,
269 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL) {
270 if (p->data_size != 0 && p->data != NULL) {
271 OPENSSL_free(ctx->salt);
273 if (!OSSL_PARAM_get_octet_string(p, (void **)&ctx->salt, 0,
282 static int kdf_hkdf_set_ctx_params(void *vctx, const OSSL_PARAM params[])
284 KDF_HKDF *ctx = vctx;
289 if (!hkdf_common_set_ctx_params(ctx, params))
292 if (ossl_param_get1_concat_octet_string(params, OSSL_KDF_PARAM_INFO,
293 &ctx->info, &ctx->info_len,
300 static const OSSL_PARAM *kdf_hkdf_settable_ctx_params(ossl_unused void *ctx,
301 ossl_unused void *provctx)
303 static const OSSL_PARAM known_settable_ctx_params[] = {
304 HKDF_COMMON_SETTABLES,
305 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_INFO, NULL, 0),
308 return known_settable_ctx_params;
311 static int kdf_hkdf_get_ctx_params(void *vctx, OSSL_PARAM params[])
313 KDF_HKDF *ctx = (KDF_HKDF *)vctx;
316 if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL) {
317 size_t sz = kdf_hkdf_size(ctx);
321 return OSSL_PARAM_set_size_t(p, sz);
323 if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_INFO)) != NULL) {
324 if (ctx->info == NULL || ctx->info_len == 0) {
328 return OSSL_PARAM_set_octet_string(p, ctx->info, ctx->info_len);
333 static const OSSL_PARAM *kdf_hkdf_gettable_ctx_params(ossl_unused void *ctx,
334 ossl_unused void *provctx)
336 static const OSSL_PARAM known_gettable_ctx_params[] = {
337 OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
338 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_INFO, NULL, 0),
341 return known_gettable_ctx_params;
344 const OSSL_DISPATCH ossl_kdf_hkdf_functions[] = {
345 { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_hkdf_new },
346 { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_hkdf_dup },
347 { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_hkdf_free },
348 { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_hkdf_reset },
349 { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_hkdf_derive },
350 { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
351 (void(*)(void))kdf_hkdf_settable_ctx_params },
352 { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_hkdf_set_ctx_params },
353 { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
354 (void(*)(void))kdf_hkdf_gettable_ctx_params },
355 { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_hkdf_get_ctx_params },
360 * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
361 * Section 2 (https://tools.ietf.org/html/rfc5869#section-2) and
362 * "Cryptographic Extraction and Key Derivation: The HKDF Scheme"
363 * Section 4.2 (https://eprint.iacr.org/2010/264.pdf).
366 * The scheme HKDF is specified as:
367 * HKDF(XTS, SKM, CTXinfo, L) = K(1) | K(2) | ... | K(t)
370 * SKM is source key material
371 * XTS is extractor salt (which may be null or constant)
372 * CTXinfo is context information (may be null)
373 * L is the number of key bits to be produced by KDF
374 * k is the output length in bits of the hash function used with HMAC
376 * the value K(t) is truncated to its first d = L mod k bits.
379 * 2.2. Step 1: Extract
380 * HKDF-Extract(salt, IKM) -> PRK
381 * 2.3. Step 2: Expand
382 * HKDF-Expand(PRK, info, L) -> OKM
384 static int HKDF(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
385 const unsigned char *salt, size_t salt_len,
386 const unsigned char *ikm, size_t ikm_len,
387 const unsigned char *info, size_t info_len,
388 unsigned char *okm, size_t okm_len)
390 unsigned char prk[EVP_MAX_MD_SIZE];
394 sz = EVP_MD_get_size(evp_md);
397 prk_len = (size_t)sz;
399 /* Step 1: HKDF-Extract(salt, IKM) -> PRK */
400 if (!HKDF_Extract(libctx, evp_md,
401 salt, salt_len, ikm, ikm_len, prk, prk_len))
404 /* Step 2: HKDF-Expand(PRK, info, L) -> OKM */
405 ret = HKDF_Expand(evp_md, prk, prk_len, info, info_len, okm, okm_len);
406 OPENSSL_cleanse(prk, sizeof(prk));
412 * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
413 * Section 2.2 (https://tools.ietf.org/html/rfc5869#section-2.2).
415 * 2.2. Step 1: Extract
417 * HKDF-Extract(salt, IKM) -> PRK
420 * Hash a hash function; HashLen denotes the length of the
421 * hash function output in octets
424 * salt optional salt value (a non-secret random value);
425 * if not provided, it is set to a string of HashLen zeros.
426 * IKM input keying material
429 * PRK a pseudorandom key (of HashLen octets)
431 * The output PRK is calculated as follows:
433 * PRK = HMAC-Hash(salt, IKM)
435 static int HKDF_Extract(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
436 const unsigned char *salt, size_t salt_len,
437 const unsigned char *ikm, size_t ikm_len,
438 unsigned char *prk, size_t prk_len)
440 int sz = EVP_MD_get_size(evp_md);
444 if (prk_len != (size_t)sz) {
445 ERR_raise(ERR_LIB_PROV, PROV_R_WRONG_OUTPUT_BUFFER_SIZE);
448 /* calc: PRK = HMAC-Hash(salt, IKM) */
450 EVP_Q_mac(libctx, "HMAC", NULL, EVP_MD_get0_name(evp_md), NULL, salt,
451 salt_len, ikm, ikm_len, prk, EVP_MD_get_size(evp_md), NULL)
456 * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
457 * Section 2.3 (https://tools.ietf.org/html/rfc5869#section-2.3).
459 * 2.3. Step 2: Expand
461 * HKDF-Expand(PRK, info, L) -> OKM
464 * Hash a hash function; HashLen denotes the length of the
465 * hash function output in octets
468 * PRK a pseudorandom key of at least HashLen octets
469 * (usually, the output from the extract step)
470 * info optional context and application specific information
471 * (can be a zero-length string)
472 * L length of output keying material in octets
476 * OKM output keying material (of L octets)
478 * The output OKM is calculated as follows:
480 * N = ceil(L/HashLen)
481 * T = T(1) | T(2) | T(3) | ... | T(N)
482 * OKM = first L octets of T
485 * T(0) = empty string (zero length)
486 * T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)
487 * T(2) = HMAC-Hash(PRK, T(1) | info | 0x02)
488 * T(3) = HMAC-Hash(PRK, T(2) | info | 0x03)
491 * (where the constant concatenated to the end of each T(n) is a
494 static int HKDF_Expand(const EVP_MD *evp_md,
495 const unsigned char *prk, size_t prk_len,
496 const unsigned char *info, size_t info_len,
497 unsigned char *okm, size_t okm_len)
502 unsigned char prev[EVP_MAX_MD_SIZE];
503 size_t done_len = 0, dig_len, n;
505 sz = EVP_MD_get_size(evp_md);
508 dig_len = (size_t)sz;
510 /* calc: N = ceil(L/HashLen) */
511 n = okm_len / dig_len;
512 if (okm_len % dig_len)
515 if (n > 255 || okm == NULL)
518 if ((hmac = HMAC_CTX_new()) == NULL)
521 if (!HMAC_Init_ex(hmac, prk, prk_len, evp_md, NULL))
524 for (i = 1; i <= n; i++) {
526 const unsigned char ctr = i;
528 /* calc: T(i) = HMAC-Hash(PRK, T(i - 1) | info | i) */
530 if (!HMAC_Init_ex(hmac, NULL, 0, NULL, NULL))
533 if (!HMAC_Update(hmac, prev, dig_len))
537 if (!HMAC_Update(hmac, info, info_len))
540 if (!HMAC_Update(hmac, &ctr, 1))
543 if (!HMAC_Final(hmac, prev, NULL))
546 copy_len = (dig_len > okm_len - done_len) ?
550 memcpy(okm + done_len, prev, copy_len);
552 done_len += copy_len;
557 OPENSSL_cleanse(prev, sizeof(prev));
563 * TLS uses slight variations of the above and for FIPS validation purposes,
564 * they need to be present here.
565 * Refer to RFC 8446 section 7 for specific details.
569 * Given a |secret|; a |label| of length |labellen|; and |data| of length
570 * |datalen| (e.g. typically a hash of the handshake messages), derive a new
571 * secret |outlen| bytes long and store it in the location pointed to be |out|.
572 * The |data| value may be zero length. Returns 1 on success and 0 on failure.
574 static int prov_tls13_hkdf_expand(const EVP_MD *md,
575 const unsigned char *key, size_t keylen,
576 const unsigned char *prefix, size_t prefixlen,
577 const unsigned char *label, size_t labellen,
578 const unsigned char *data, size_t datalen,
579 unsigned char *out, size_t outlen)
582 unsigned char hkdflabel[HKDF_MAXBUF];
586 * 2 bytes for length of derived secret + 1 byte for length of combined
587 * prefix and label + bytes for the label itself + 1 byte length of hash
588 * + bytes for the hash itself. We've got the maximum the KDF can handle
589 * which should always be sufficient.
591 if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
592 || !WPACKET_put_bytes_u16(&pkt, outlen)
593 || !WPACKET_start_sub_packet_u8(&pkt)
594 || !WPACKET_memcpy(&pkt, prefix, prefixlen)
595 || !WPACKET_memcpy(&pkt, label, labellen)
596 || !WPACKET_close(&pkt)
597 || !WPACKET_sub_memcpy_u8(&pkt, data, (data == NULL) ? 0 : datalen)
598 || !WPACKET_get_total_written(&pkt, &hkdflabellen)
599 || !WPACKET_finish(&pkt)) {
600 WPACKET_cleanup(&pkt);
604 return HKDF_Expand(md, key, keylen, hkdflabel, hkdflabellen,
608 static int prov_tls13_hkdf_generate_secret(OSSL_LIB_CTX *libctx,
610 const unsigned char *prevsecret,
611 size_t prevsecretlen,
612 const unsigned char *insecret,
614 const unsigned char *prefix,
616 const unsigned char *label,
618 unsigned char *out, size_t outlen)
622 unsigned char preextractsec[EVP_MAX_MD_SIZE];
623 /* Always filled with zeros */
624 static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
626 ret = EVP_MD_get_size(md);
627 /* Ensure cast to size_t is safe */
632 if (insecret == NULL) {
633 insecret = default_zeros;
636 if (prevsecret == NULL) {
637 prevsecret = default_zeros;
638 prevsecretlen = mdlen;
640 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
641 unsigned char hash[EVP_MAX_MD_SIZE];
643 /* The pre-extract derive step uses a hash of no messages */
645 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
646 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
647 EVP_MD_CTX_free(mctx);
650 EVP_MD_CTX_free(mctx);
652 /* Generate the pre-extract secret */
653 if (!prov_tls13_hkdf_expand(md, prevsecret, mdlen,
654 prefix, prefixlen, label, labellen,
655 hash, mdlen, preextractsec, mdlen))
657 prevsecret = preextractsec;
658 prevsecretlen = mdlen;
661 ret = HKDF_Extract(libctx, md, prevsecret, prevsecretlen,
662 insecret, insecretlen, out, outlen);
664 if (prevsecret == preextractsec)
665 OPENSSL_cleanse(preextractsec, mdlen);
669 static int kdf_tls1_3_derive(void *vctx, unsigned char *key, size_t keylen,
670 const OSSL_PARAM params[])
672 KDF_HKDF *ctx = (KDF_HKDF *)vctx;
675 if (!ossl_prov_is_running() || !kdf_tls1_3_set_ctx_params(ctx, params))
678 md = ossl_prov_digest_md(&ctx->digest);
680 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
688 case EVP_KDF_HKDF_MODE_EXTRACT_ONLY:
689 return prov_tls13_hkdf_generate_secret(PROV_LIBCTX_OF(ctx->provctx),
691 ctx->salt, ctx->salt_len,
692 ctx->key, ctx->key_len,
693 ctx->prefix, ctx->prefix_len,
694 ctx->label, ctx->label_len,
697 case EVP_KDF_HKDF_MODE_EXPAND_ONLY:
698 return prov_tls13_hkdf_expand(md, ctx->key, ctx->key_len,
699 ctx->prefix, ctx->prefix_len,
700 ctx->label, ctx->label_len,
701 ctx->data, ctx->data_len,
706 static int kdf_tls1_3_set_ctx_params(void *vctx, const OSSL_PARAM params[])
709 KDF_HKDF *ctx = vctx;
714 if (!hkdf_common_set_ctx_params(ctx, params))
717 if (ctx->mode == EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND) {
718 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
722 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PREFIX)) != NULL) {
723 OPENSSL_free(ctx->prefix);
725 if (!OSSL_PARAM_get_octet_string(p, (void **)&ctx->prefix, 0,
730 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_LABEL)) != NULL) {
731 OPENSSL_free(ctx->label);
733 if (!OSSL_PARAM_get_octet_string(p, (void **)&ctx->label, 0,
738 OPENSSL_clear_free(ctx->data, ctx->data_len);
740 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_DATA)) != NULL
741 && !OSSL_PARAM_get_octet_string(p, (void **)&ctx->data, 0,
747 static const OSSL_PARAM *kdf_tls1_3_settable_ctx_params(ossl_unused void *ctx,
748 ossl_unused void *provctx)
750 static const OSSL_PARAM known_settable_ctx_params[] = {
751 HKDF_COMMON_SETTABLES,
752 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PREFIX, NULL, 0),
753 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_LABEL, NULL, 0),
754 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_DATA, NULL, 0),
757 return known_settable_ctx_params;
760 const OSSL_DISPATCH ossl_kdf_tls1_3_kdf_functions[] = {
761 { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_hkdf_new },
762 { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_hkdf_dup },
763 { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_hkdf_free },
764 { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_hkdf_reset },
765 { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_tls1_3_derive },
766 { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
767 (void(*)(void))kdf_tls1_3_settable_ctx_params },
768 { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_tls1_3_set_ctx_params },
769 { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
770 (void(*)(void))kdf_hkdf_gettable_ctx_params },
771 { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_hkdf_get_ctx_params },