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 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.  See OSSL_PARAM(3) for the use
33       of OSSL_PARAM as parameter descriptor.  These functions must only be
34       called after the EVP_PKEY_CTX has been initialised for use in an
35       operation.
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37   Parameters
38       Examples of EVP_PKEY parameters include the following:
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40       "Common parameters" in provider-keymgmt(7) "Key Exchange parameters" in
41       provider-keyexch(7) "Signature parameters" in provider-signature(7)
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43       "Common RSA parameters" in EVP_PKEY-RSA(7) "RSA key generation
44       parameters" in EVP_PKEY-RSA(7) "FFC parameters" in EVP_PKEY-FFC(7) "FFC
45       key generation parameters" in EVP_PKEY-FFC(7) "DSA parameters" in
46       EVP_PKEY-DSA(7) "DSA key generation parameters" in EVP_PKEY-DSA(7) "DH
47       parameters" in EVP_PKEY-DH(7) "DH key generation parameters" in
48       EVP_PKEY-DH(7) "Common EC parameters" in EVP_PKEY-EC(7) "Common X25519,
49       X448, ED25519 and ED448 parameters" in EVP_PKEY-X25519(7)
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RETURN VALUES

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

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

68       All functions were added in OpenSSL 3.0.
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71       Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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73       Licensed under the Apache License 2.0 (the "License").  You may not use
74       this file except in compliance with the License.  You can obtain a copy
75       in the file LICENSE in the source distribution or at
76       <https://www.openssl.org/source/license.html>.
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803.0.5                             2022-11-01    EVP_PKEY_CTX_SET_PARAMS(3ossl)
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