2 * Copyright 2016-2022 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);
120 OPENSSL_free(ctx->salt);
121 OPENSSL_free(ctx->prefix);
122 OPENSSL_free(ctx->label);
123 OPENSSL_clear_free(ctx->data, ctx->data_len);
124 OPENSSL_clear_free(ctx->key, ctx->key_len);
125 OPENSSL_clear_free(ctx->info, ctx->info_len);
126 memset(ctx, 0, sizeof(*ctx));
127 ctx->provctx = provctx;
130 static void *kdf_hkdf_dup(void *vctx)
132 const KDF_HKDF *src = (const KDF_HKDF *)vctx;
135 dest = kdf_hkdf_new(src->provctx);
137 if (!ossl_prov_memdup(src->salt, src->salt_len, &dest->salt,
139 || !ossl_prov_memdup(src->key, src->key_len,
140 &dest->key , &dest->key_len)
141 || !ossl_prov_memdup(src->prefix, src->prefix_len,
142 &dest->prefix, &dest->prefix_len)
143 || !ossl_prov_memdup(src->label, src->label_len,
144 &dest->label, &dest->label_len)
145 || !ossl_prov_memdup(src->data, src->data_len,
146 &dest->data, &dest->data_len)
147 || !ossl_prov_memdup(src->info, src->info_len,
148 &dest->info, &dest->info_len)
149 || !ossl_prov_digest_copy(&dest->digest, &src->digest))
151 dest->mode = src->mode;
160 static size_t kdf_hkdf_size(KDF_HKDF *ctx)
163 const EVP_MD *md = ossl_prov_digest_md(&ctx->digest);
165 if (ctx->mode != EVP_KDF_HKDF_MODE_EXTRACT_ONLY)
169 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
172 sz = EVP_MD_get_size(md);
179 static int kdf_hkdf_derive(void *vctx, unsigned char *key, size_t keylen,
180 const OSSL_PARAM params[])
182 KDF_HKDF *ctx = (KDF_HKDF *)vctx;
183 OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
186 if (!ossl_prov_is_running() || !kdf_hkdf_set_ctx_params(ctx, params))
189 md = ossl_prov_digest_md(&ctx->digest);
191 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
194 if (ctx->key == NULL) {
195 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_KEY);
199 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
204 case EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND:
206 return HKDF(libctx, md, ctx->salt, ctx->salt_len,
207 ctx->key, ctx->key_len, ctx->info, ctx->info_len, key, keylen);
209 case EVP_KDF_HKDF_MODE_EXTRACT_ONLY:
210 return HKDF_Extract(libctx, md, ctx->salt, ctx->salt_len,
211 ctx->key, ctx->key_len, key, keylen);
213 case EVP_KDF_HKDF_MODE_EXPAND_ONLY:
214 return HKDF_Expand(md, ctx->key, ctx->key_len, ctx->info,
215 ctx->info_len, key, keylen);
219 static int hkdf_common_set_ctx_params(KDF_HKDF *ctx, const OSSL_PARAM params[])
221 OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
228 if (!ossl_prov_digest_load_from_params(&ctx->digest, params, libctx))
231 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_MODE)) != NULL) {
232 if (p->data_type == OSSL_PARAM_UTF8_STRING) {
233 if (OPENSSL_strcasecmp(p->data, "EXTRACT_AND_EXPAND") == 0) {
234 ctx->mode = EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND;
235 } else if (OPENSSL_strcasecmp(p->data, "EXTRACT_ONLY") == 0) {
236 ctx->mode = EVP_KDF_HKDF_MODE_EXTRACT_ONLY;
237 } else if (OPENSSL_strcasecmp(p->data, "EXPAND_ONLY") == 0) {
238 ctx->mode = EVP_KDF_HKDF_MODE_EXPAND_ONLY;
240 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
243 } else if (OSSL_PARAM_get_int(p, &n)) {
244 if (n != EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND
245 && n != EVP_KDF_HKDF_MODE_EXTRACT_ONLY
246 && n != EVP_KDF_HKDF_MODE_EXPAND_ONLY) {
247 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
252 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
257 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY)) != NULL) {
258 OPENSSL_clear_free(ctx->key, ctx->key_len);
260 if (!OSSL_PARAM_get_octet_string(p, (void **)&ctx->key, 0,
265 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL) {
266 if (p->data_size != 0 && p->data != NULL) {
267 OPENSSL_free(ctx->salt);
269 if (!OSSL_PARAM_get_octet_string(p, (void **)&ctx->salt, 0,
278 static int kdf_hkdf_set_ctx_params(void *vctx, const OSSL_PARAM params[])
280 KDF_HKDF *ctx = vctx;
285 if (!hkdf_common_set_ctx_params(ctx, params))
288 if (ossl_param_get1_concat_octet_string(params, OSSL_KDF_PARAM_INFO,
289 &ctx->info, &ctx->info_len,
296 static const OSSL_PARAM *kdf_hkdf_settable_ctx_params(ossl_unused void *ctx,
297 ossl_unused void *provctx)
299 static const OSSL_PARAM known_settable_ctx_params[] = {
300 HKDF_COMMON_SETTABLES,
301 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_INFO, NULL, 0),
304 return known_settable_ctx_params;
307 static int kdf_hkdf_get_ctx_params(void *vctx, OSSL_PARAM params[])
309 KDF_HKDF *ctx = (KDF_HKDF *)vctx;
312 if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL) {
313 size_t sz = kdf_hkdf_size(ctx);
317 return OSSL_PARAM_set_size_t(p, sz);
322 static const OSSL_PARAM *kdf_hkdf_gettable_ctx_params(ossl_unused void *ctx,
323 ossl_unused void *provctx)
325 static const OSSL_PARAM known_gettable_ctx_params[] = {
326 OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
329 return known_gettable_ctx_params;
332 const OSSL_DISPATCH ossl_kdf_hkdf_functions[] = {
333 { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_hkdf_new },
334 { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_hkdf_dup },
335 { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_hkdf_free },
336 { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_hkdf_reset },
337 { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_hkdf_derive },
338 { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
339 (void(*)(void))kdf_hkdf_settable_ctx_params },
340 { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_hkdf_set_ctx_params },
341 { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
342 (void(*)(void))kdf_hkdf_gettable_ctx_params },
343 { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_hkdf_get_ctx_params },
348 * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
349 * Section 2 (https://tools.ietf.org/html/rfc5869#section-2) and
350 * "Cryptographic Extraction and Key Derivation: The HKDF Scheme"
351 * Section 4.2 (https://eprint.iacr.org/2010/264.pdf).
354 * The scheme HKDF is specified as:
355 * HKDF(XTS, SKM, CTXinfo, L) = K(1) | K(2) | ... | K(t)
358 * SKM is source key material
359 * XTS is extractor salt (which may be null or constant)
360 * CTXinfo is context information (may be null)
361 * L is the number of key bits to be produced by KDF
362 * k is the output length in bits of the hash function used with HMAC
364 * the value K(t) is truncated to its first d = L mod k bits.
367 * 2.2. Step 1: Extract
368 * HKDF-Extract(salt, IKM) -> PRK
369 * 2.3. Step 2: Expand
370 * HKDF-Expand(PRK, info, L) -> OKM
372 static int HKDF(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
373 const unsigned char *salt, size_t salt_len,
374 const unsigned char *ikm, size_t ikm_len,
375 const unsigned char *info, size_t info_len,
376 unsigned char *okm, size_t okm_len)
378 unsigned char prk[EVP_MAX_MD_SIZE];
382 sz = EVP_MD_get_size(evp_md);
385 prk_len = (size_t)sz;
387 /* Step 1: HKDF-Extract(salt, IKM) -> PRK */
388 if (!HKDF_Extract(libctx, evp_md,
389 salt, salt_len, ikm, ikm_len, prk, prk_len))
392 /* Step 2: HKDF-Expand(PRK, info, L) -> OKM */
393 ret = HKDF_Expand(evp_md, prk, prk_len, info, info_len, okm, okm_len);
394 OPENSSL_cleanse(prk, sizeof(prk));
400 * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
401 * Section 2.2 (https://tools.ietf.org/html/rfc5869#section-2.2).
403 * 2.2. Step 1: Extract
405 * HKDF-Extract(salt, IKM) -> PRK
408 * Hash a hash function; HashLen denotes the length of the
409 * hash function output in octets
412 * salt optional salt value (a non-secret random value);
413 * if not provided, it is set to a string of HashLen zeros.
414 * IKM input keying material
417 * PRK a pseudorandom key (of HashLen octets)
419 * The output PRK is calculated as follows:
421 * PRK = HMAC-Hash(salt, IKM)
423 static int HKDF_Extract(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
424 const unsigned char *salt, size_t salt_len,
425 const unsigned char *ikm, size_t ikm_len,
426 unsigned char *prk, size_t prk_len)
428 int sz = EVP_MD_get_size(evp_md);
432 if (prk_len != (size_t)sz) {
433 ERR_raise(ERR_LIB_PROV, PROV_R_WRONG_OUTPUT_BUFFER_SIZE);
436 /* calc: PRK = HMAC-Hash(salt, IKM) */
438 EVP_Q_mac(libctx, "HMAC", NULL, EVP_MD_get0_name(evp_md), NULL, salt,
439 salt_len, ikm, ikm_len, prk, EVP_MD_get_size(evp_md), NULL)
444 * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
445 * Section 2.3 (https://tools.ietf.org/html/rfc5869#section-2.3).
447 * 2.3. Step 2: Expand
449 * HKDF-Expand(PRK, info, L) -> OKM
452 * Hash a hash function; HashLen denotes the length of the
453 * hash function output in octets
456 * PRK a pseudorandom key of at least HashLen octets
457 * (usually, the output from the extract step)
458 * info optional context and application specific information
459 * (can be a zero-length string)
460 * L length of output keying material in octets
464 * OKM output keying material (of L octets)
466 * The output OKM is calculated as follows:
468 * N = ceil(L/HashLen)
469 * T = T(1) | T(2) | T(3) | ... | T(N)
470 * OKM = first L octets of T
473 * T(0) = empty string (zero length)
474 * T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)
475 * T(2) = HMAC-Hash(PRK, T(1) | info | 0x02)
476 * T(3) = HMAC-Hash(PRK, T(2) | info | 0x03)
479 * (where the constant concatenated to the end of each T(n) is a
482 static int HKDF_Expand(const EVP_MD *evp_md,
483 const unsigned char *prk, size_t prk_len,
484 const unsigned char *info, size_t info_len,
485 unsigned char *okm, size_t okm_len)
490 unsigned char prev[EVP_MAX_MD_SIZE];
491 size_t done_len = 0, dig_len, n;
493 sz = EVP_MD_get_size(evp_md);
496 dig_len = (size_t)sz;
498 /* calc: N = ceil(L/HashLen) */
499 n = okm_len / dig_len;
500 if (okm_len % dig_len)
503 if (n > 255 || okm == NULL)
506 if ((hmac = HMAC_CTX_new()) == NULL)
509 if (!HMAC_Init_ex(hmac, prk, prk_len, evp_md, NULL))
512 for (i = 1; i <= n; i++) {
514 const unsigned char ctr = i;
516 /* calc: T(i) = HMAC-Hash(PRK, T(i - 1) | info | i) */
518 if (!HMAC_Init_ex(hmac, NULL, 0, NULL, NULL))
521 if (!HMAC_Update(hmac, prev, dig_len))
525 if (!HMAC_Update(hmac, info, info_len))
528 if (!HMAC_Update(hmac, &ctr, 1))
531 if (!HMAC_Final(hmac, prev, NULL))
534 copy_len = (done_len + dig_len > okm_len) ?
538 memcpy(okm + done_len, prev, copy_len);
540 done_len += copy_len;
545 OPENSSL_cleanse(prev, sizeof(prev));
551 * TLS uses slight variations of the above and for FIPS validation purposes,
552 * they need to be present here.
553 * Refer to RFC 8446 section 7 for specific details.
557 * Given a |secret|; a |label| of length |labellen|; and |data| of length
558 * |datalen| (e.g. typically a hash of the handshake messages), derive a new
559 * secret |outlen| bytes long and store it in the location pointed to be |out|.
560 * The |data| value may be zero length. Returns 1 on success and 0 on failure.
562 static int prov_tls13_hkdf_expand(const EVP_MD *md,
563 const unsigned char *key, size_t keylen,
564 const unsigned char *prefix, size_t prefixlen,
565 const unsigned char *label, size_t labellen,
566 const unsigned char *data, size_t datalen,
567 unsigned char *out, size_t outlen)
570 unsigned char hkdflabel[HKDF_MAXBUF];
574 * 2 bytes for length of derived secret + 1 byte for length of combined
575 * prefix and label + bytes for the label itself + 1 byte length of hash
576 * + bytes for the hash itself. We've got the maximum the KDF can handle
577 * which should always be sufficient.
579 if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
580 || !WPACKET_put_bytes_u16(&pkt, outlen)
581 || !WPACKET_start_sub_packet_u8(&pkt)
582 || !WPACKET_memcpy(&pkt, prefix, prefixlen)
583 || !WPACKET_memcpy(&pkt, label, labellen)
584 || !WPACKET_close(&pkt)
585 || !WPACKET_sub_memcpy_u8(&pkt, data, (data == NULL) ? 0 : datalen)
586 || !WPACKET_get_total_written(&pkt, &hkdflabellen)
587 || !WPACKET_finish(&pkt)) {
588 WPACKET_cleanup(&pkt);
592 return HKDF_Expand(md, key, keylen, hkdflabel, hkdflabellen,
596 static int prov_tls13_hkdf_generate_secret(OSSL_LIB_CTX *libctx,
598 const unsigned char *prevsecret,
599 size_t prevsecretlen,
600 const unsigned char *insecret,
602 const unsigned char *prefix,
604 const unsigned char *label,
606 unsigned char *out, size_t outlen)
610 unsigned char preextractsec[EVP_MAX_MD_SIZE];
611 /* Always filled with zeros */
612 static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
614 ret = EVP_MD_get_size(md);
615 /* Ensure cast to size_t is safe */
620 if (insecret == NULL) {
621 insecret = default_zeros;
624 if (prevsecret == NULL) {
625 prevsecret = default_zeros;
628 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
629 unsigned char hash[EVP_MAX_MD_SIZE];
631 /* The pre-extract derive step uses a hash of no messages */
633 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
634 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
635 EVP_MD_CTX_free(mctx);
638 EVP_MD_CTX_free(mctx);
640 /* Generate the pre-extract secret */
641 if (!prov_tls13_hkdf_expand(md, prevsecret, mdlen,
642 prefix, prefixlen, label, labellen,
643 hash, mdlen, preextractsec, mdlen))
645 prevsecret = preextractsec;
646 prevsecretlen = mdlen;
649 ret = HKDF_Extract(libctx, md, prevsecret, prevsecretlen,
650 insecret, insecretlen, out, outlen);
652 if (prevsecret == preextractsec)
653 OPENSSL_cleanse(preextractsec, mdlen);
657 static int kdf_tls1_3_derive(void *vctx, unsigned char *key, size_t keylen,
658 const OSSL_PARAM params[])
660 KDF_HKDF *ctx = (KDF_HKDF *)vctx;
663 if (!ossl_prov_is_running() || !kdf_tls1_3_set_ctx_params(ctx, params))
666 md = ossl_prov_digest_md(&ctx->digest);
668 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
676 case EVP_KDF_HKDF_MODE_EXTRACT_ONLY:
677 return prov_tls13_hkdf_generate_secret(PROV_LIBCTX_OF(ctx->provctx),
679 ctx->salt, ctx->salt_len,
680 ctx->key, ctx->key_len,
681 ctx->prefix, ctx->prefix_len,
682 ctx->label, ctx->label_len,
685 case EVP_KDF_HKDF_MODE_EXPAND_ONLY:
686 return prov_tls13_hkdf_expand(md, ctx->key, ctx->key_len,
687 ctx->prefix, ctx->prefix_len,
688 ctx->label, ctx->label_len,
689 ctx->data, ctx->data_len,
694 static int kdf_tls1_3_set_ctx_params(void *vctx, const OSSL_PARAM params[])
697 KDF_HKDF *ctx = vctx;
702 if (!hkdf_common_set_ctx_params(ctx, params))
705 if (ctx->mode == EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND) {
706 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
710 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PREFIX)) != NULL) {
711 OPENSSL_free(ctx->prefix);
713 if (!OSSL_PARAM_get_octet_string(p, (void **)&ctx->prefix, 0,
718 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_LABEL)) != NULL) {
719 OPENSSL_free(ctx->label);
721 if (!OSSL_PARAM_get_octet_string(p, (void **)&ctx->label, 0,
726 OPENSSL_clear_free(ctx->data, ctx->data_len);
728 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_DATA)) != NULL
729 && !OSSL_PARAM_get_octet_string(p, (void **)&ctx->data, 0,
735 static const OSSL_PARAM *kdf_tls1_3_settable_ctx_params(ossl_unused void *ctx,
736 ossl_unused void *provctx)
738 static const OSSL_PARAM known_settable_ctx_params[] = {
739 HKDF_COMMON_SETTABLES,
740 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PREFIX, NULL, 0),
741 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_LABEL, NULL, 0),
742 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_DATA, NULL, 0),
745 return known_settable_ctx_params;
748 const OSSL_DISPATCH ossl_kdf_tls1_3_kdf_functions[] = {
749 { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_hkdf_new },
750 { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_hkdf_dup },
751 { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_hkdf_free },
752 { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_hkdf_reset },
753 { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_tls1_3_derive },
754 { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
755 (void(*)(void))kdf_tls1_3_settable_ctx_params },
756 { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_tls1_3_set_ctx_params },
757 { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
758 (void(*)(void))kdf_hkdf_gettable_ctx_params },
759 { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_hkdf_get_ctx_params },