Fix users of KDFs to use params not ctls
[openssl.git] / crypto / ec / ecdh_kdf.c
1 /*
2  * Copyright 2015-2019 The OpenSSL Project Authors. All Rights Reserved.
3  *
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
8  */
9
10 #include <string.h>
11 #include <openssl/core_names.h>
12 #include <openssl/ec.h>
13 #include <openssl/evp.h>
14 #include <openssl/kdf.h>
15 #include "ec_lcl.h"
16
17 /* Key derivation function from X9.63/SECG */
18 int ecdh_KDF_X9_63(unsigned char *out, size_t outlen,
19                    const unsigned char *Z, size_t Zlen,
20                    const unsigned char *sinfo, size_t sinfolen,
21                    const EVP_MD *md)
22 {
23     int ret = 0;
24     EVP_KDF_CTX *kctx = NULL;
25     OSSL_PARAM params[4], *p = params;
26     const char *mdname = EVP_MD_name(md);
27     EVP_KDF *kdf = EVP_KDF_fetch(NULL, SN_x963kdf, NULL);
28
29     if ((kctx = EVP_KDF_CTX_new(kdf)) != NULL) {
30         *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
31                                                 (char *)mdname,
32                                                 strlen(mdname) + 1);
33         *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
34                                                  (void *)Z, Zlen);
35         *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
36                                                  (void *)sinfo, sinfolen);
37         *p = OSSL_PARAM_construct_end();
38
39         ret = EVP_KDF_CTX_set_params(kctx, params) > 0
40             && EVP_KDF_derive(kctx, out, outlen) > 0;
41         EVP_KDF_CTX_free(kctx);
42     }
43     EVP_KDF_free(kdf);
44     return ret;
45 }
46
47 /*-
48  * The old name for ecdh_KDF_X9_63
49  * Retained for ABI compatibility
50  */
51 #if !OPENSSL_API_3
52 int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
53                    const unsigned char *Z, size_t Zlen,
54                    const unsigned char *sinfo, size_t sinfolen,
55                    const EVP_MD *md)
56 {
57     return ecdh_KDF_X9_63(out, outlen, Z, Zlen, sinfo, sinfolen, md);
58 }
59 #endif