2 * Copyright 2015-2020 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
11 * ECDH low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
17 #include <openssl/core_names.h>
18 #include <openssl/ec.h>
19 #include <openssl/evp.h>
20 #include <openssl/kdf.h>
23 /* Key derivation function from X9.63/SECG */
24 int ecdh_KDF_X9_63(unsigned char *out, size_t outlen,
25 const unsigned char *Z, size_t Zlen,
26 const unsigned char *sinfo, size_t sinfolen,
28 OSSL_LIB_CTX *libctx, const char *propq)
31 EVP_KDF_CTX *kctx = NULL;
32 OSSL_PARAM params[4], *p = params;
33 const char *mdname = EVP_MD_name(md);
34 EVP_KDF *kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X963KDF, propq);
36 if ((kctx = EVP_KDF_CTX_new(kdf)) != NULL) {
37 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
39 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
41 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
42 (void *)sinfo, sinfolen);
43 *p = OSSL_PARAM_construct_end();
45 ret = EVP_KDF_CTX_set_params(kctx, params) > 0
46 && EVP_KDF_derive(kctx, out, outlen) > 0;
47 EVP_KDF_CTX_free(kctx);
54 * The old name for ecdh_KDF_X9_63
55 * Retained for ABI compatibility
57 #ifndef OPENSSL_NO_DEPRECATED_3_0
58 int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
59 const unsigned char *Z, size_t Zlen,
60 const unsigned char *sinfo, size_t sinfolen,
63 return ecdh_KDF_X9_63(out, outlen, Z, Zlen, sinfo, sinfolen, md, NULL, NULL);