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X963 KDF is used for CMS ec keyagree Recipient Info. The X963 KDF that is used by CMS EC Key Agreement has been moved into a EVP_KDF object. This KDF is almost identical to the the SSKDF hash variant, so it has been implemented inside the SSKDF code with its own method table. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/8902)
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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* Copyright 2015-2019 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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#include <string.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_lcl.h"
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/* Key derivation function from X9.63/SECG */
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int 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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{
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int ret;
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EVP_KDF_CTX *kctx = NULL;
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kctx = EVP_KDF_CTX_new(EVP_get_kdfbyname(SN_x963kdf));
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ret =
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kctx != NULL
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&& EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MD, md) > 0
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&& EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_KEY, Z, Zlen) > 0
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&& EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SHARED_INFO, sinfo, sinfolen) > 0
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&& EVP_KDF_derive(kctx, out, outlen) > 0;
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EVP_KDF_CTX_free(kctx);
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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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#if !OPENSSL_API_3
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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 ecdh_KDF_X9_63(out, outlen, Z, Zlen, sinfo, sinfolen, md);
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}
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#endif
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