66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
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/*
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* Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* ECDH low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <string.h>
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#include <openssl/core_names.h>
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#include <openssl/ec.h>
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#include <openssl/evp.h>
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#include <openssl/kdf.h>
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#include "ec_local.h"
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/* Key derivation function from X9.63/SECG */
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int ossl_ecdh_kdf_X9_63(unsigned char *out, size_t outlen,
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const unsigned char *Z, size_t Zlen,
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const unsigned char *sinfo, size_t sinfolen,
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const EVP_MD *md,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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int ret = 0;
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EVP_KDF_CTX *kctx = NULL;
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OSSL_PARAM params[4], *p = params;
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const char *mdname = EVP_MD_get0_name(md);
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EVP_KDF *kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X963KDF, propq);
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if ((kctx = EVP_KDF_CTX_new(kdf)) != NULL) {
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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(char *)mdname, 0);
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
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(void *)Z, Zlen);
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
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(void *)sinfo, sinfolen);
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*p = OSSL_PARAM_construct_end();
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ret = EVP_KDF_derive(kctx, out, outlen, params) > 0;
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EVP_KDF_CTX_free(kctx);
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}
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EVP_KDF_free(kdf);
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return ret;
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}
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/*-
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* The old name for ecdh_KDF_X9_63
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* Retained for ABI compatibility
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*/
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#ifndef OPENSSL_NO_DEPRECATED_3_0
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int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
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const unsigned char *Z, size_t Zlen,
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const unsigned char *sinfo, size_t sinfolen,
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const EVP_MD *md)
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{
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return ossl_ecdh_kdf_X9_63(out, outlen, Z, Zlen, sinfo, sinfolen, md, NULL,
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NULL);
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}
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#endif
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