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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/ec/ecdh_kdf.c
2 * Copyright 2015-2019 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 #include <openssl/core_names.h>
12 #include <openssl/ec.h>
13 #include <openssl/evp.h>
14 #include <openssl/kdf.h>
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
,
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
);
29 if ((kctx
= EVP_KDF_CTX_new(kdf
)) != NULL
) {
30 *p
++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST
,
33 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY
,
35 *p
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO
,
36 (void *)sinfo
, sinfolen
);
37 *p
= OSSL_PARAM_construct_end();
39 ret
= EVP_KDF_CTX_set_params(kctx
, params
) > 0
40 && EVP_KDF_derive(kctx
, out
, outlen
) > 0;
41 EVP_KDF_CTX_free(kctx
);
48 * The old name for ecdh_KDF_X9_63
49 * Retained for ABI compatibility
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
,
57 return ecdh_KDF_X9_63(out
, outlen
, Z
, Zlen
, sinfo
, sinfolen
, md
);