2 * Copyright 2020-2023 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
10 #include <openssl/crypto.h>
11 #include <openssl/kdf.h>
12 #include <openssl/core_dispatch.h>
13 #include <openssl/core_names.h>
14 #include <openssl/err.h>
15 #include <openssl/proverr.h>
16 #include <openssl/params.h>
17 #include "internal/numbers.h"
18 #include "prov/implementations.h"
19 #include "prov/provider_ctx.h"
20 #include "prov/kdfexchange.h"
21 #include "prov/providercommon.h"
23 static OSSL_FUNC_keyexch_newctx_fn kdf_tls1_prf_newctx
;
24 static OSSL_FUNC_keyexch_newctx_fn kdf_hkdf_newctx
;
25 static OSSL_FUNC_keyexch_newctx_fn kdf_scrypt_newctx
;
26 static OSSL_FUNC_keyexch_init_fn kdf_init
;
27 static OSSL_FUNC_keyexch_derive_fn kdf_derive
;
28 static OSSL_FUNC_keyexch_freectx_fn kdf_freectx
;
29 static OSSL_FUNC_keyexch_dupctx_fn kdf_dupctx
;
30 static OSSL_FUNC_keyexch_set_ctx_params_fn kdf_set_ctx_params
;
31 static OSSL_FUNC_keyexch_settable_ctx_params_fn kdf_tls1_prf_settable_ctx_params
;
32 static OSSL_FUNC_keyexch_settable_ctx_params_fn kdf_hkdf_settable_ctx_params
;
33 static OSSL_FUNC_keyexch_settable_ctx_params_fn kdf_scrypt_settable_ctx_params
;
41 static void *kdf_newctx(const char *kdfname
, void *provctx
)
46 if (!ossl_prov_is_running())
49 kdfctx
= OPENSSL_zalloc(sizeof(PROV_KDF_CTX
));
53 kdfctx
->provctx
= provctx
;
55 kdf
= EVP_KDF_fetch(PROV_LIBCTX_OF(provctx
), kdfname
, NULL
);
58 kdfctx
->kdfctx
= EVP_KDF_CTX_new(kdf
);
61 if (kdfctx
->kdfctx
== NULL
)
70 #define KDF_NEWCTX(funcname, kdfname) \
71 static void *kdf_##funcname##_newctx(void *provctx) \
73 return kdf_newctx(kdfname, provctx); \
76 KDF_NEWCTX(tls1_prf
, "TLS1-PRF")
77 KDF_NEWCTX(hkdf
, "HKDF")
78 KDF_NEWCTX(scrypt
, "SCRYPT")
80 static int kdf_init(void *vpkdfctx
, void *vkdf
, const OSSL_PARAM params
[])
82 PROV_KDF_CTX
*pkdfctx
= (PROV_KDF_CTX
*)vpkdfctx
;
84 if (!ossl_prov_is_running()
87 || !ossl_kdf_data_up_ref(vkdf
))
89 pkdfctx
->kdfdata
= vkdf
;
91 return kdf_set_ctx_params(pkdfctx
, params
);
94 static int kdf_derive(void *vpkdfctx
, unsigned char *secret
, size_t *secretlen
,
97 PROV_KDF_CTX
*pkdfctx
= (PROV_KDF_CTX
*)vpkdfctx
;
101 if (!ossl_prov_is_running())
104 kdfsize
= EVP_KDF_CTX_get_kdf_size(pkdfctx
->kdfctx
);
106 if (secret
== NULL
) {
107 *secretlen
= kdfsize
;
111 if (kdfsize
!= SIZE_MAX
) {
112 if (outlen
< kdfsize
) {
113 ERR_raise(ERR_LIB_PROV
, PROV_R_OUTPUT_BUFFER_TOO_SMALL
);
119 ret
= EVP_KDF_derive(pkdfctx
->kdfctx
, secret
, outlen
, NULL
);
127 static void kdf_freectx(void *vpkdfctx
)
129 PROV_KDF_CTX
*pkdfctx
= (PROV_KDF_CTX
*)vpkdfctx
;
131 EVP_KDF_CTX_free(pkdfctx
->kdfctx
);
132 ossl_kdf_data_free(pkdfctx
->kdfdata
);
134 OPENSSL_free(pkdfctx
);
137 static void *kdf_dupctx(void *vpkdfctx
)
139 PROV_KDF_CTX
*srcctx
= (PROV_KDF_CTX
*)vpkdfctx
;
140 PROV_KDF_CTX
*dstctx
;
142 if (!ossl_prov_is_running())
145 dstctx
= OPENSSL_zalloc(sizeof(*srcctx
));
151 dstctx
->kdfctx
= EVP_KDF_CTX_dup(srcctx
->kdfctx
);
152 if (dstctx
->kdfctx
== NULL
) {
153 OPENSSL_free(dstctx
);
156 if (!ossl_kdf_data_up_ref(dstctx
->kdfdata
)) {
157 EVP_KDF_CTX_free(dstctx
->kdfctx
);
158 OPENSSL_free(dstctx
);
165 static int kdf_set_ctx_params(void *vpkdfctx
, const OSSL_PARAM params
[])
167 PROV_KDF_CTX
*pkdfctx
= (PROV_KDF_CTX
*)vpkdfctx
;
169 return EVP_KDF_CTX_set_params(pkdfctx
->kdfctx
, params
);
172 static const OSSL_PARAM
*kdf_settable_ctx_params(ossl_unused
void *vpkdfctx
,
176 EVP_KDF
*kdf
= EVP_KDF_fetch(PROV_LIBCTX_OF(provctx
), kdfname
,
178 const OSSL_PARAM
*params
;
183 params
= EVP_KDF_settable_ctx_params(kdf
);
189 #define KDF_SETTABLE_CTX_PARAMS(funcname, kdfname) \
190 static const OSSL_PARAM *kdf_##funcname##_settable_ctx_params(void *vpkdfctx, \
193 return kdf_settable_ctx_params(vpkdfctx, provctx, kdfname); \
196 KDF_SETTABLE_CTX_PARAMS(tls1_prf
, "TLS1-PRF")
197 KDF_SETTABLE_CTX_PARAMS(hkdf
, "HKDF")
198 KDF_SETTABLE_CTX_PARAMS(scrypt
, "SCRYPT")
200 #define KDF_KEYEXCH_FUNCTIONS(funcname) \
201 const OSSL_DISPATCH ossl_kdf_##funcname##_keyexch_functions[] = { \
202 { OSSL_FUNC_KEYEXCH_NEWCTX, (void (*)(void))kdf_##funcname##_newctx }, \
203 { OSSL_FUNC_KEYEXCH_INIT, (void (*)(void))kdf_init }, \
204 { OSSL_FUNC_KEYEXCH_DERIVE, (void (*)(void))kdf_derive }, \
205 { OSSL_FUNC_KEYEXCH_FREECTX, (void (*)(void))kdf_freectx }, \
206 { OSSL_FUNC_KEYEXCH_DUPCTX, (void (*)(void))kdf_dupctx }, \
207 { OSSL_FUNC_KEYEXCH_SET_CTX_PARAMS, (void (*)(void))kdf_set_ctx_params }, \
208 { OSSL_FUNC_KEYEXCH_SETTABLE_CTX_PARAMS, \
209 (void (*)(void))kdf_##funcname##_settable_ctx_params }, \
213 KDF_KEYEXCH_FUNCTIONS(tls1_prf
)
214 KDF_KEYEXCH_FUNCTIONS(hkdf
)
215 KDF_KEYEXCH_FUNCTIONS(scrypt
)