5 EVP_SIGNATURE_fetch, EVP_SIGNATURE_free, EVP_SIGNATURE_up_ref,
7 - Functions to manage EVP_SIGNATURE algorithm objects
11 #include <openssl/evp.h>
13 EVP_SIGNATURE *EVP_SIGNATURE_fetch(OPENSSL_CTX *ctx, const char *algorithm,
14 const char *properties);
15 void EVP_SIGNATURE_free(EVP_SIGNATURE *signature);
16 int EVP_SIGNATURE_up_ref(EVP_SIGNATURE *signature);
17 OSSL_PROVIDER *EVP_SIGNATURE_provider(const EVP_SIGNATURE *signature);
21 EVP_SIGNATURE_fetch() fetches the implementation for the given
22 B<algorithm> from any provider offering it, within the criteria given
24 The algorithm will be one offering functions for performing signature related
25 tasks such as signing and verifying.
26 See L<provider(7)/Fetching algorithms> for further information.
28 The returned value must eventually be freed with EVP_SIGNATURE_free().
30 EVP_SIGNATURE_free() decrements the reference count for the B<EVP_SIGNATURE>
31 structure. Typically this structure will have been obtained from an earlier call
32 to EVP_SIGNATURE_fetch(). If the reference count drops to 0 then the
35 EVP_SIGNATURE_up_ref() increments the reference count for an B<EVP_SIGNATURE>
38 EVP_SIGNATURE_provider() returns the provider that I<signature> was fetched from.
42 EVP_SIGNATURE_fetch() returns a pointer to an B<EVP_SIGNATURE> for success
43 or B<NULL> for failure.
45 EVP_SIGNATURE_up_ref() returns 1 for success or 0 otherwise.
49 L<provider(7)/Fetching algorithms>, L<OSSL_PROVIDER(3)>
53 The functions described here were added in OpenSSL 3.0.
57 Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
59 Licensed under the Apache License 2.0 (the "License"). You may not use
60 this file except in compliance with the License. You can obtain a copy
61 in the file LICENSE in the source distribution or at
62 L<https://www.openssl.org/source/license.html>.