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0abae1636d
Downgrading EVP_PKEYs from containing provider side internal keys to containing legacy keys demands support in the EVP_PKEY_ASN1_METHOD. This became a bit elaborate because the code would be almost exactly the same as the import functions int EVP_KEYMGMT. Therefore, we end up moving most of the code to common backend support files that can be used both by legacy backend code and by our providers. Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11375)
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/*
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* Copyright 2020 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 <openssl/core_names.h>
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#include "crypto/dh.h"
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/*
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* The intention with the "backend" source file is to offer backend functions
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* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
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* implementations alike.
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*/
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int dh_key_fromdata(DH *dh, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_priv_key, *param_pub_key;
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BIGNUM *priv_key = NULL, *pub_key = NULL;
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if (dh == NULL)
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return 0;
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param_priv_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
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param_pub_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
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/*
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* DH documentation says that a public key must be present if a
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* private key is present.
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* We want to have at least a public key either way, so we end up
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* requiring it unconditionally.
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*/
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if (param_priv_key != NULL && param_pub_key == NULL)
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return 0;
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if ((param_priv_key != NULL
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&& !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
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|| (param_pub_key != NULL
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&& !OSSL_PARAM_get_BN(param_pub_key, &pub_key)))
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goto err;
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if (!DH_set0_key(dh, pub_key, priv_key))
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goto err;
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return 1;
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err:
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BN_clear_free(priv_key);
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BN_free(pub_key);
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return 0;
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}
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