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_local.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, OSSL_KDF_NAME_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 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
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 |
60 | |