1 /*
2 * Copyright 2019-2023 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 /*
12 * Refer to https://csrc.nist.gov/publications/detail/sp/800-56c/rev-1/final
13 * Section 4.1.
14 *
15 * The Single Step KDF algorithm is given by:
16 *
17 * Result(0) = empty bit string (i.e., the null string).
18 * For i = 1 to reps, do the following:
19 * Increment counter by 1.
20 * Result(i) = Result(i - 1) || H(counter || Z || FixedInfo).
21 * DKM = LeftmostBits(Result(reps), L))
22 *
23 * NOTES:
24 * Z is a shared secret required to produce the derived key material.
25 * counter is a 4 byte buffer.
26 * FixedInfo is a bit string containing context specific data.
27 * DKM is the output derived key material.
28 * L is the required size of the DKM.
29 * reps = [L / H_outputBits]
30 * H(x) is the auxiliary function that can be either a hash, HMAC or KMAC.
31 * H_outputBits is the length of the output of the auxiliary function H(x).
32 *
33 * Currently there is not a comprehensive list of test vectors for this
34 * algorithm, especially for H(x) = HMAC and H(x) = KMAC.
35 * Test vectors for H(x) = Hash are indirectly used by CAVS KAS tests.
36 */
37 #include <stdlib.h>
38 #include <stdarg.h>
39 #include <string.h>
40 #include <openssl/hmac.h>
41 #include <openssl/evp.h>
42 #include <openssl/kdf.h>
43 #include <openssl/core_names.h>
44 #include <openssl/params.h>
45 #include <openssl/proverr.h>
46 #include "internal/cryptlib.h"
47 #include "internal/numbers.h"
48 #include "crypto/evp.h"
49 #include "prov/provider_ctx.h"
50 #include "prov/providercommon.h"
51 #include "prov/implementations.h"
52 #include "prov/provider_util.h"
53
54 typedef struct {
55 void *provctx;
56 EVP_MAC_CTX *macctx; /* H(x) = HMAC_hash OR H(x) = KMAC */
57 PROV_DIGEST digest; /* H(x) = hash(x) */
58 unsigned char *secret;
59 size_t secret_len;
60 unsigned char *info;
61 size_t info_len;
62 unsigned char *salt;
63 size_t salt_len;
64 size_t out_len; /* optional KMAC parameter */
65 int is_kmac;
66 } KDF_SSKDF;
67
68 #define SSKDF_MAX_INLEN (1<<30)
69 #define SSKDF_KMAC128_DEFAULT_SALT_SIZE (168 - 4)
70 #define SSKDF_KMAC256_DEFAULT_SALT_SIZE (136 - 4)
71
72 /* KMAC uses a Customisation string of 'KDF' */
73 static const unsigned char kmac_custom_str[] = { 0x4B, 0x44, 0x46 };
74
75 static OSSL_FUNC_kdf_newctx_fn sskdf_new;
76 static OSSL_FUNC_kdf_freectx_fn sskdf_free;
77 static OSSL_FUNC_kdf_reset_fn sskdf_reset;
78 static OSSL_FUNC_kdf_derive_fn sskdf_derive;
79 static OSSL_FUNC_kdf_derive_fn x963kdf_derive;
80 static OSSL_FUNC_kdf_settable_ctx_params_fn sskdf_settable_ctx_params;
81 static OSSL_FUNC_kdf_set_ctx_params_fn sskdf_set_ctx_params;
82 static OSSL_FUNC_kdf_gettable_ctx_params_fn sskdf_gettable_ctx_params;
83 static OSSL_FUNC_kdf_get_ctx_params_fn sskdf_get_ctx_params;
84
85 /*
86 * Refer to https://csrc.nist.gov/publications/detail/sp/800-56c/rev-1/final
87 * Section 4. One-Step Key Derivation using H(x) = hash(x)
88 * Note: X9.63 also uses this code with the only difference being that the
89 * counter is appended to the secret 'z'.
90 * i.e.
91 * result[i] = Hash(counter || z || info) for One Step OR
92 * result[i] = Hash(z || counter || info) for X9.63.
93 */
SSKDF_hash_kdm(const EVP_MD * kdf_md,const unsigned char * z,size_t z_len,const unsigned char * info,size_t info_len,unsigned int append_ctr,unsigned char * derived_key,size_t derived_key_len)94 static int SSKDF_hash_kdm(const EVP_MD *kdf_md,
95 const unsigned char *z, size_t z_len,
96 const unsigned char *info, size_t info_len,
97 unsigned int append_ctr,
98 unsigned char *derived_key, size_t derived_key_len)
99 {
100 int ret = 0, hlen;
101 size_t counter, out_len, len = derived_key_len;
102 unsigned char c[4];
103 unsigned char mac[EVP_MAX_MD_SIZE];
104 unsigned char *out = derived_key;
105 EVP_MD_CTX *ctx = NULL, *ctx_init = NULL;
106
107 if (z_len > SSKDF_MAX_INLEN || info_len > SSKDF_MAX_INLEN
108 || derived_key_len > SSKDF_MAX_INLEN
109 || derived_key_len == 0)
110 return 0;
111
112 hlen = EVP_MD_get_size(kdf_md);
113 if (hlen <= 0)
114 return 0;
115 out_len = (size_t)hlen;
116
117 ctx = EVP_MD_CTX_create();
118 ctx_init = EVP_MD_CTX_create();
119 if (ctx == NULL || ctx_init == NULL)
120 goto end;
121
122 if (!EVP_DigestInit(ctx_init, kdf_md))
123 goto end;
124
125 for (counter = 1;; counter++) {
126 c[0] = (unsigned char)((counter >> 24) & 0xff);
127 c[1] = (unsigned char)((counter >> 16) & 0xff);
128 c[2] = (unsigned char)((counter >> 8) & 0xff);
129 c[3] = (unsigned char)(counter & 0xff);
130
131 if (!(EVP_MD_CTX_copy_ex(ctx, ctx_init)
132 && (append_ctr || EVP_DigestUpdate(ctx, c, sizeof(c)))
133 && EVP_DigestUpdate(ctx, z, z_len)
134 && (!append_ctr || EVP_DigestUpdate(ctx, c, sizeof(c)))
135 && EVP_DigestUpdate(ctx, info, info_len)))
136 goto end;
137 if (len >= out_len) {
138 if (!EVP_DigestFinal_ex(ctx, out, NULL))
139 goto end;
140 out += out_len;
141 len -= out_len;
142 if (len == 0)
143 break;
144 } else {
145 if (!EVP_DigestFinal_ex(ctx, mac, NULL))
146 goto end;
147 memcpy(out, mac, len);
148 break;
149 }
150 }
151 ret = 1;
152 end:
153 EVP_MD_CTX_destroy(ctx);
154 EVP_MD_CTX_destroy(ctx_init);
155 OPENSSL_cleanse(mac, sizeof(mac));
156 return ret;
157 }
158
kmac_init(EVP_MAC_CTX * ctx,const unsigned char * custom,size_t custom_len,size_t kmac_out_len,size_t derived_key_len,unsigned char ** out)159 static int kmac_init(EVP_MAC_CTX *ctx, const unsigned char *custom,
160 size_t custom_len, size_t kmac_out_len,
161 size_t derived_key_len, unsigned char **out)
162 {
163 OSSL_PARAM params[2];
164
165 /* Only KMAC has custom data - so return if not KMAC */
166 if (custom == NULL)
167 return 1;
168
169 params[0] = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_CUSTOM,
170 (void *)custom, custom_len);
171 params[1] = OSSL_PARAM_construct_end();
172
173 if (!EVP_MAC_CTX_set_params(ctx, params))
174 return 0;
175
176 /* By default only do one iteration if kmac_out_len is not specified */
177 if (kmac_out_len == 0)
178 kmac_out_len = derived_key_len;
179 /* otherwise check the size is valid */
180 else if (!(kmac_out_len == derived_key_len
181 || kmac_out_len == 20
182 || kmac_out_len == 28
183 || kmac_out_len == 32
184 || kmac_out_len == 48
185 || kmac_out_len == 64))
186 return 0;
187
188 params[0] = OSSL_PARAM_construct_size_t(OSSL_MAC_PARAM_SIZE,
189 &kmac_out_len);
190
191 if (EVP_MAC_CTX_set_params(ctx, params) <= 0)
192 return 0;
193
194 /*
195 * For kmac the output buffer can be larger than EVP_MAX_MD_SIZE: so
196 * alloc a buffer for this case.
197 */
198 if (kmac_out_len > EVP_MAX_MD_SIZE) {
199 *out = OPENSSL_zalloc(kmac_out_len);
200 if (*out == NULL)
201 return 0;
202 }
203 return 1;
204 }
205
206 /*
207 * Refer to https://csrc.nist.gov/publications/detail/sp/800-56c/rev-1/final
208 * Section 4. One-Step Key Derivation using MAC: i.e either
209 * H(x) = HMAC-hash(salt, x) OR
210 * H(x) = KMAC#(salt, x, outbits, CustomString='KDF')
211 */
SSKDF_mac_kdm(EVP_MAC_CTX * ctx_init,const unsigned char * kmac_custom,size_t kmac_custom_len,size_t kmac_out_len,const unsigned char * salt,size_t salt_len,const unsigned char * z,size_t z_len,const unsigned char * info,size_t info_len,unsigned char * derived_key,size_t derived_key_len)212 static int SSKDF_mac_kdm(EVP_MAC_CTX *ctx_init,
213 const unsigned char *kmac_custom,
214 size_t kmac_custom_len, size_t kmac_out_len,
215 const unsigned char *salt, size_t salt_len,
216 const unsigned char *z, size_t z_len,
217 const unsigned char *info, size_t info_len,
218 unsigned char *derived_key, size_t derived_key_len)
219 {
220 int ret = 0;
221 size_t counter, out_len, len;
222 unsigned char c[4];
223 unsigned char mac_buf[EVP_MAX_MD_SIZE];
224 unsigned char *out = derived_key;
225 EVP_MAC_CTX *ctx = NULL;
226 unsigned char *mac = mac_buf, *kmac_buffer = NULL;
227
228 if (z_len > SSKDF_MAX_INLEN || info_len > SSKDF_MAX_INLEN
229 || derived_key_len > SSKDF_MAX_INLEN
230 || derived_key_len == 0)
231 return 0;
232
233 if (!kmac_init(ctx_init, kmac_custom, kmac_custom_len, kmac_out_len,
234 derived_key_len, &kmac_buffer))
235 goto end;
236 if (kmac_buffer != NULL)
237 mac = kmac_buffer;
238
239 if (!EVP_MAC_init(ctx_init, salt, salt_len, NULL))
240 goto end;
241
242 out_len = EVP_MAC_CTX_get_mac_size(ctx_init); /* output size */
243 if (out_len <= 0 || (mac == mac_buf && out_len > sizeof(mac_buf)))
244 goto end;
245 len = derived_key_len;
246
247 for (counter = 1;; counter++) {
248 c[0] = (unsigned char)((counter >> 24) & 0xff);
249 c[1] = (unsigned char)((counter >> 16) & 0xff);
250 c[2] = (unsigned char)((counter >> 8) & 0xff);
251 c[3] = (unsigned char)(counter & 0xff);
252
253 ctx = EVP_MAC_CTX_dup(ctx_init);
254 if (!(ctx != NULL
255 && EVP_MAC_update(ctx, c, sizeof(c))
256 && EVP_MAC_update(ctx, z, z_len)
257 && EVP_MAC_update(ctx, info, info_len)))
258 goto end;
259 if (len >= out_len) {
260 if (!EVP_MAC_final(ctx, out, NULL, len))
261 goto end;
262 out += out_len;
263 len -= out_len;
264 if (len == 0)
265 break;
266 } else {
267 if (!EVP_MAC_final(ctx, mac, NULL, out_len))
268 goto end;
269 memcpy(out, mac, len);
270 break;
271 }
272 EVP_MAC_CTX_free(ctx);
273 ctx = NULL;
274 }
275 ret = 1;
276 end:
277 if (kmac_buffer != NULL)
278 OPENSSL_clear_free(kmac_buffer, kmac_out_len);
279 else
280 OPENSSL_cleanse(mac_buf, sizeof(mac_buf));
281
282 EVP_MAC_CTX_free(ctx);
283 return ret;
284 }
285
sskdf_new(void * provctx)286 static void *sskdf_new(void *provctx)
287 {
288 KDF_SSKDF *ctx;
289
290 if (!ossl_prov_is_running())
291 return NULL;
292
293 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
294 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
295 ctx->provctx = provctx;
296 return ctx;
297 }
298
sskdf_reset(void * vctx)299 static void sskdf_reset(void *vctx)
300 {
301 KDF_SSKDF *ctx = (KDF_SSKDF *)vctx;
302 void *provctx = ctx->provctx;
303
304 EVP_MAC_CTX_free(ctx->macctx);
305 ossl_prov_digest_reset(&ctx->digest);
306 OPENSSL_clear_free(ctx->secret, ctx->secret_len);
307 OPENSSL_clear_free(ctx->info, ctx->info_len);
308 OPENSSL_clear_free(ctx->salt, ctx->salt_len);
309 memset(ctx, 0, sizeof(*ctx));
310 ctx->provctx = provctx;
311 }
312
sskdf_free(void * vctx)313 static void sskdf_free(void *vctx)
314 {
315 KDF_SSKDF *ctx = (KDF_SSKDF *)vctx;
316
317 if (ctx != NULL) {
318 sskdf_reset(ctx);
319 OPENSSL_free(ctx);
320 }
321 }
322
sskdf_set_buffer(unsigned char ** out,size_t * out_len,const OSSL_PARAM * p)323 static int sskdf_set_buffer(unsigned char **out, size_t *out_len,
324 const OSSL_PARAM *p)
325 {
326 if (p->data == NULL || p->data_size == 0)
327 return 1;
328 OPENSSL_free(*out);
329 *out = NULL;
330 return OSSL_PARAM_get_octet_string(p, (void **)out, 0, out_len);
331 }
332
sskdf_size(KDF_SSKDF * ctx)333 static size_t sskdf_size(KDF_SSKDF *ctx)
334 {
335 int len;
336 const EVP_MD *md = NULL;
337
338 if (ctx->is_kmac)
339 return SIZE_MAX;
340
341 md = ossl_prov_digest_md(&ctx->digest);
342 if (md == NULL) {
343 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
344 return 0;
345 }
346 len = EVP_MD_get_size(md);
347 return (len <= 0) ? 0 : (size_t)len;
348 }
349
sskdf_derive(void * vctx,unsigned char * key,size_t keylen,const OSSL_PARAM params[])350 static int sskdf_derive(void *vctx, unsigned char *key, size_t keylen,
351 const OSSL_PARAM params[])
352 {
353 KDF_SSKDF *ctx = (KDF_SSKDF *)vctx;
354 const EVP_MD *md;
355
356 if (!ossl_prov_is_running() || !sskdf_set_ctx_params(ctx, params))
357 return 0;
358 if (ctx->secret == NULL) {
359 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SECRET);
360 return 0;
361 }
362 md = ossl_prov_digest_md(&ctx->digest);
363
364 if (ctx->macctx != NULL) {
365 /* H(x) = KMAC or H(x) = HMAC */
366 int ret;
367 const unsigned char *custom = NULL;
368 size_t custom_len = 0;
369 int default_salt_len;
370 EVP_MAC *mac = EVP_MAC_CTX_get0_mac(ctx->macctx);
371
372 if (EVP_MAC_is_a(mac, OSSL_MAC_NAME_HMAC)) {
373 /* H(x) = HMAC(x, salt, hash) */
374 if (md == NULL) {
375 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
376 return 0;
377 }
378 default_salt_len = EVP_MD_get_size(md);
379 if (default_salt_len <= 0)
380 return 0;
381 } else if (ctx->is_kmac) {
382 /* H(x) = KMACzzz(x, salt, custom) */
383 custom = kmac_custom_str;
384 custom_len = sizeof(kmac_custom_str);
385 if (EVP_MAC_is_a(mac, OSSL_MAC_NAME_KMAC128))
386 default_salt_len = SSKDF_KMAC128_DEFAULT_SALT_SIZE;
387 else
388 default_salt_len = SSKDF_KMAC256_DEFAULT_SALT_SIZE;
389 } else {
390 ERR_raise(ERR_LIB_PROV, PROV_R_UNSUPPORTED_MAC_TYPE);
391 return 0;
392 }
393 /* If no salt is set then use a default_salt of zeros */
394 if (ctx->salt == NULL || ctx->salt_len <= 0) {
395 ctx->salt = OPENSSL_zalloc(default_salt_len);
396 if (ctx->salt == NULL) {
397 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
398 return 0;
399 }
400 ctx->salt_len = default_salt_len;
401 }
402 ret = SSKDF_mac_kdm(ctx->macctx,
403 custom, custom_len, ctx->out_len,
404 ctx->salt, ctx->salt_len,
405 ctx->secret, ctx->secret_len,
406 ctx->info, ctx->info_len, key, keylen);
407 return ret;
408 } else {
409 /* H(x) = hash */
410 if (md == NULL) {
411 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
412 return 0;
413 }
414 return SSKDF_hash_kdm(md, ctx->secret, ctx->secret_len,
415 ctx->info, ctx->info_len, 0, key, keylen);
416 }
417 }
418
x963kdf_derive(void * vctx,unsigned char * key,size_t keylen,const OSSL_PARAM params[])419 static int x963kdf_derive(void *vctx, unsigned char *key, size_t keylen,
420 const OSSL_PARAM params[])
421 {
422 KDF_SSKDF *ctx = (KDF_SSKDF *)vctx;
423 const EVP_MD *md;
424
425 if (!ossl_prov_is_running() || !sskdf_set_ctx_params(ctx, params))
426 return 0;
427
428 if (ctx->secret == NULL) {
429 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SECRET);
430 return 0;
431 }
432
433 if (ctx->macctx != NULL) {
434 ERR_raise(ERR_LIB_PROV, PROV_R_NOT_SUPPORTED);
435 return 0;
436 }
437
438 /* H(x) = hash */
439 md = ossl_prov_digest_md(&ctx->digest);
440 if (md == NULL) {
441 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST);
442 return 0;
443 }
444
445 return SSKDF_hash_kdm(md, ctx->secret, ctx->secret_len,
446 ctx->info, ctx->info_len, 1, key, keylen);
447 }
448
sskdf_set_ctx_params(void * vctx,const OSSL_PARAM params[])449 static int sskdf_set_ctx_params(void *vctx, const OSSL_PARAM params[])
450 {
451 const OSSL_PARAM *p;
452 KDF_SSKDF *ctx = vctx;
453 OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
454 size_t sz;
455
456 if (params == NULL)
457 return 1;
458
459 if (!ossl_prov_macctx_load_from_params(&ctx->macctx, params,
460 NULL, NULL, NULL, libctx))
461 return 0;
462 if (ctx->macctx != NULL) {
463 if (EVP_MAC_is_a(EVP_MAC_CTX_get0_mac(ctx->macctx),
464 OSSL_MAC_NAME_KMAC128)
465 || EVP_MAC_is_a(EVP_MAC_CTX_get0_mac(ctx->macctx),
466 OSSL_MAC_NAME_KMAC256)) {
467 ctx->is_kmac = 1;
468 }
469 }
470
471 if (!ossl_prov_digest_load_from_params(&ctx->digest, params, libctx))
472 return 0;
473
474 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SECRET)) != NULL
475 || (p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY)) != NULL)
476 if (!sskdf_set_buffer(&ctx->secret, &ctx->secret_len, p))
477 return 0;
478
479 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_INFO)) != NULL)
480 if (!sskdf_set_buffer(&ctx->info, &ctx->info_len, p))
481 return 0;
482
483 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL)
484 if (!sskdf_set_buffer(&ctx->salt, &ctx->salt_len, p))
485 return 0;
486
487 if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_MAC_SIZE))
488 != NULL) {
489 if (!OSSL_PARAM_get_size_t(p, &sz) || sz == 0)
490 return 0;
491 ctx->out_len = sz;
492 }
493 return 1;
494 }
495
sskdf_settable_ctx_params(ossl_unused void * ctx,ossl_unused void * provctx)496 static const OSSL_PARAM *sskdf_settable_ctx_params(ossl_unused void *ctx,
497 ossl_unused void *provctx)
498 {
499 static const OSSL_PARAM known_settable_ctx_params[] = {
500 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SECRET, NULL, 0),
501 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_KEY, NULL, 0),
502 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_INFO, NULL, 0),
503 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
504 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
505 OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_MAC, NULL, 0),
506 OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
507 OSSL_PARAM_size_t(OSSL_KDF_PARAM_MAC_SIZE, NULL),
508 OSSL_PARAM_END
509 };
510 return known_settable_ctx_params;
511 }
512
sskdf_get_ctx_params(void * vctx,OSSL_PARAM params[])513 static int sskdf_get_ctx_params(void *vctx, OSSL_PARAM params[])
514 {
515 KDF_SSKDF *ctx = (KDF_SSKDF *)vctx;
516 OSSL_PARAM *p;
517
518 if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
519 return OSSL_PARAM_set_size_t(p, sskdf_size(ctx));
520 return -2;
521 }
522
sskdf_gettable_ctx_params(ossl_unused void * ctx,ossl_unused void * provctx)523 static const OSSL_PARAM *sskdf_gettable_ctx_params(ossl_unused void *ctx,
524 ossl_unused void *provctx)
525 {
526 static const OSSL_PARAM known_gettable_ctx_params[] = {
527 OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
528 OSSL_PARAM_END
529 };
530 return known_gettable_ctx_params;
531 }
532
533 const OSSL_DISPATCH ossl_kdf_sskdf_functions[] = {
534 { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))sskdf_new },
535 { OSSL_FUNC_KDF_FREECTX, (void(*)(void))sskdf_free },
536 { OSSL_FUNC_KDF_RESET, (void(*)(void))sskdf_reset },
537 { OSSL_FUNC_KDF_DERIVE, (void(*)(void))sskdf_derive },
538 { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
539 (void(*)(void))sskdf_settable_ctx_params },
540 { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))sskdf_set_ctx_params },
541 { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
542 (void(*)(void))sskdf_gettable_ctx_params },
543 { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))sskdf_get_ctx_params },
544 { 0, NULL }
545 };
546
547 const OSSL_DISPATCH ossl_kdf_x963_kdf_functions[] = {
548 { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))sskdf_new },
549 { OSSL_FUNC_KDF_FREECTX, (void(*)(void))sskdf_free },
550 { OSSL_FUNC_KDF_RESET, (void(*)(void))sskdf_reset },
551 { OSSL_FUNC_KDF_DERIVE, (void(*)(void))x963kdf_derive },
552 { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
553 (void(*)(void))sskdf_settable_ctx_params },
554 { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))sskdf_set_ctx_params },
555 { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
556 (void(*)(void))sskdf_gettable_ctx_params },
557 { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))sskdf_get_ctx_params },
558 { 0, NULL }
559 };
560