1EVP_PKEY_CTX_SET_PARAMS(3ossl)      OpenSSL     EVP_PKEY_CTX_SET_PARAMS(3ossl)
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NAME

6       EVP_PKEY_CTX_set_params, EVP_PKEY_CTX_settable_params,
7       EVP_PKEY_CTX_get_params, EVP_PKEY_CTX_gettable_params - provider
8       parameter passing operations
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SYNOPSIS

11        #include <openssl/evp.h>
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13        int EVP_PKEY_CTX_set_params(EVP_PKEY_CTX *ctx, const OSSL_PARAM *params);
14        const OSSL_PARAM *EVP_PKEY_CTX_settable_params(const EVP_PKEY_CTX *ctx);
15        int EVP_PKEY_CTX_get_params(EVP_PKEY_CTX *ctx, OSSL_PARAM *params);
16        const OSSL_PARAM *EVP_PKEY_CTX_gettable_params(const EVP_PKEY_CTX *ctx);
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DESCRIPTION

19       The EVP_PKEY_CTX_get_params() and EVP_PKEY_CTX_set_params() functions
20       allow transfer of arbitrary key parameters to and from providers.  Not
21       all parameters may be supported by all providers.  See OSSL_PROVIDER(3)
22       for more information on providers.  See OSSL_PARAM(3) for more
23       information on parameters.  These functions must only be called after
24       the EVP_PKEY_CTX has been initialised for use in an operation.  These
25       methods replace the EVP_PKEY_CTX_ctrl() mechanism. (EVP_PKEY_CTX_ctrl
26       now calls these methods internally to interact with providers).
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28       EVP_PKEY_CTX_gettable_params() and EVP_PKEY_CTX_settable_params() get a
29       constant OSSL_PARAM(3) array that describes the gettable and settable
30       parameters for the current algorithm implementation, i.e. parameters
31       that can be used with EVP_PKEY_CTX_get_params() and
32       EVP_PKEY_CTX_set_params() respectively.  These functions must only be
33       called after the EVP_PKEY_CTX has been initialised for use in an
34       operation.
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36   Parameters
37       Examples of EVP_PKEY parameters include the following:
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39       "Common parameters" in provider-keymgmt(7) "Key Exchange parameters" in
40       provider-keyexch(7) "Signature parameters" in provider-signature(7)
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42       "Common RSA parameters" in EVP_PKEY-RSA(7) "RSA key generation
43       parameters" in EVP_PKEY-RSA(7) "FFC parameters" in EVP_PKEY-FFC(7) "FFC
44       key generation parameters" in EVP_PKEY-FFC(7) "DSA parameters" in
45       EVP_PKEY-DSA(7) "DSA key generation parameters" in EVP_PKEY-DSA(7) "DH
46       parameters" in EVP_PKEY-DH(7) "DH key generation parameters" in
47       EVP_PKEY-DH(7) "Common EC parameters" in EVP_PKEY-EC(7) "Common X25519,
48       X448, ED25519 and ED448 parameters" in EVP_PKEY-X25519(7)
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RETURN VALUES

51       EVP_PKEY_CTX_set_params() returns 1 for success or 0 otherwise.
52       EVP_PKEY_CTX_settable_params() returns an OSSL_PARAM array on success
53       or NULL on error.  It may also return NULL if there are no settable
54       parameters available.
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56       All other functions and macros described on this page return a positive
57       value for success and 0 or a negative value for failure. In particular
58       a return value of -2 indicates the operation is not supported by the
59       public key algorithm.
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SEE ALSO

62       EVP_PKEY_CTX_new(3), EVP_PKEY_encrypt(3), EVP_PKEY_decrypt(3),
63       EVP_PKEY_sign(3), EVP_PKEY_verify(3), EVP_PKEY_verify_recover(3),
64       EVP_PKEY_derive(3), EVP_PKEY_keygen(3)
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HISTORY

67       All functions were added in OpenSSL 3.0.
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70       Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
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72       Licensed under the Apache License 2.0 (the "License").  You may not use
73       this file except in compliance with the License.  You can obtain a copy
74       in the file LICENSE in the source distribution or at
75       <https://www.openssl.org/source/license.html>.
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793.1.1                             2023-08-31    EVP_PKEY_CTX_SET_PARAMS(3ossl)
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