1aec7716c1
Move the KDF code for CMS DH key agreement into an EVP_KDF object. There are 2 specifications for X9.42 KDF. This implementation uses DER for otherinfo which embeds the KDF loop counter inside the DER object. Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/8898)
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/*
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* Copyright 2013-2019 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 "e_os.h"
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#ifndef OPENSSL_NO_CMS
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# include <string.h>
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# include <openssl/dh.h>
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# include <openssl/evp.h>
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# include <openssl/asn1.h>
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# include <openssl/kdf.h>
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int DH_KDF_X9_42(unsigned char *out, size_t outlen,
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const unsigned char *Z, size_t Zlen,
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ASN1_OBJECT *key_oid,
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const unsigned char *ukm, size_t ukmlen, const EVP_MD *md)
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{
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int ret = 0, nid;
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EVP_KDF_CTX *kctx = NULL;
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const EVP_KDF *kdf = NULL;
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const char *oid_sn;
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nid = OBJ_obj2nid(key_oid);
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if (nid == NID_undef)
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return 0;
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oid_sn = OBJ_nid2sn(nid);
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if (oid_sn == NULL)
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return 0;
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kdf = EVP_get_kdfbyname(SN_x942kdf);
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if (kdf == NULL)
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goto err;
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kctx = EVP_KDF_CTX_new(kdf);
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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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&& (ukm == NULL
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|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_UKM, ukm, ukmlen) > 0)
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&& EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_CEK_ALG, oid_sn) > 0
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&& EVP_KDF_derive(kctx, out, outlen) > 0;
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err:
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EVP_KDF_CTX_free(kctx);
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return ret;
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}
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#endif /* OPENSSL_NO_CMS */
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