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
find_alg_id(OSSL_LIB_CTX * libctx,const char * algname,const char * propq,size_t * id)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
DER_w_keyinfo(WPACKET * pkt,const unsigned char * der_oid,size_t der_oidlen,unsigned char ** pcounter)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
der_encode_sharedinfo(WPACKET * pkt,unsigned char * buf,size_t buflen,const unsigned char * der_oid,size_t der_oidlen,const unsigned char * acvp,size_t acvplen,const unsigned char * partyu,size_t partyulen,const unsigned char * partyv,size_t partyvlen,const unsigned char * supp_pub,size_t supp_publen,const unsigned char * supp_priv,size_t supp_privlen,uint32_t keylen_bits,unsigned char ** pcounter)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
x942_encode_otherinfo(size_t keylen,const unsigned char * cek_oid,size_t cek_oid_len,const unsigned char * acvp,size_t acvp_len,const unsigned char * partyu,size_t partyu_len,const unsigned char * partyv,size_t partyv_len,const unsigned char * supp_pub,size_t supp_pub_len,const unsigned char * supp_priv,size_t supp_priv_len,unsigned char ** der,size_t * der_len,unsigned char ** out_ctr)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
x942kdf_hash_kdm(const EVP_MD * kdf_md,const unsigned char * z,size_t z_len,const unsigned char * other,size_t other_len,unsigned char * ctr,unsigned char * derived_key,size_t derived_key_len)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
x942kdf_new(void * provctx)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
x942kdf_reset(void * vctx)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
x942kdf_free(void * vctx)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
x942kdf_set_buffer(unsigned char ** out,size_t * out_len,const OSSL_PARAM * p)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
x942kdf_size(KDF_X942 * ctx)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
x942kdf_derive(void * vctx,unsigned char * key,size_t keylen,const OSSL_PARAM params[])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
x942kdf_set_ctx_params(void * vctx,const OSSL_PARAM params[])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
x942kdf_settable_ctx_params(ossl_unused void * ctx,ossl_unused void * provctx)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
x942kdf_get_ctx_params(void * vctx,OSSL_PARAM params[])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
x942kdf_gettable_ctx_params(ossl_unused void * ctx,ossl_unused void * provctx)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