5 EVP_PKEY_CTX_new, EVP_PKEY_CTX_new_id, EVP_PKEY_CTX_new_from_name,
6 EVP_PKEY_CTX_new_from_pkey, EVP_PKEY_CTX_dup, EVP_PKEY_CTX_free
7 - public key algorithm context functions
11 #include <openssl/evp.h>
13 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e);
14 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e);
15 EVP_PKEY_CTX *EVP_PKEY_CTX_new_from_name(OPENSSL_CTX *libctx,
17 const char *propquery);
18 EVP_PKEY_CTX *EVP_PKEY_CTX_new_from_pkey(OPENSSL_CTX *libctx,
20 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(const EVP_PKEY_CTX *ctx);
21 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx);
25 The EVP_PKEY_CTX_new() function allocates public key algorithm context using
26 the I<pkey> key type and ENGINE I<e>.
28 The EVP_PKEY_CTX_new_id() function allocates public key algorithm context
29 using the key type specified by I<id> and ENGINE I<e>.
31 The EVP_PKEY_CTX_new_from_name() function allocates a public key algorithm
32 context using the library context I<libctx> (see L<OPENSSL_CTX(3)>), the
33 key type specified by I<name> and the property query I<propquery>. None
34 of the arguments are duplicated, so they must remain unchanged for the
35 lifetime of the returned B<EVP_PKEY_CTX> or of any of its duplicates.
37 The EVP_PKEY_CTX_new_from_pkey() function allocates a public key algorithm
38 context using the library context I<libctx> (see L<OPENSSL_CTX(3)>) and the
39 algorithm specified by I<pkey> . None of the arguments are duplicated, so they
40 must remain unchanged for the lifetime of the returned B<EVP_PKEY_CTX> or of
41 any of its duplicates.
43 EVP_PKEY_CTX_new_id() and EVP_PKEY_CTX_new_from_name() are normally
44 used when no B<EVP_PKEY> structure is associated with the operations,
45 for example during parameter generation or key generation for some
48 EVP_PKEY_CTX_dup() duplicates the context I<ctx>.
50 EVP_PKEY_CTX_free() frees up the context I<ctx>.
51 If I<ctx> is NULL, nothing is done.
59 The B<EVP_PKEY_CTX> structure is an opaque public key algorithm context used
60 by the OpenSSL high level public key API. Contexts B<MUST NOT> be shared between
61 threads: that is it is not permissible to use the same context simultaneously
66 We mention "key type" in this manual, which is the same
67 as "algorithm" in most cases, allowing either term to be used
68 interchangeably. There are algorithms where the I<key type> and the
69 I<algorithm> of the operations that use the keys are not the same,
70 such as EC keys being used for ECDSA and ECDH operations.
76 EVP_PKEY_CTX_new(), EVP_PKEY_CTX_new_id(), EVP_PKEY_CTX_dup() returns either
77 the newly allocated B<EVP_PKEY_CTX> structure of B<NULL> if an error occurred.
79 EVP_PKEY_CTX_free() does not return a value.
87 The EVP_PKEY_CTX_new(), EVP_PKEY_CTX_new_id(), EVP_PKEY_CTX_dup() and
88 EVP_PKEY_CTX_free() functions were added in OpenSSL 1.0.0.
90 The EVP_PKEY_CTX_new_from_name() and EVP_PKEY_CTX_new_from_pkey() functions were
95 Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
97 Licensed under the Apache License 2.0 (the "License"). You may not use
98 this file except in compliance with the License. You can obtain a copy
99 in the file LICENSE in the source distribution or at
100 L<https://www.openssl.org/source/license.html>.