mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
317ed1b417
It appears to have been misplaced Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/16063)
114 lines
3.6 KiB
Plaintext
114 lines
3.6 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
EVP_PKEY_is_a, EVP_PKEY_can_sign, EVP_PKEY_type_names_do_all,
|
|
EVP_PKEY_get0_type_name, EVP_PKEY_get0_description, EVP_PKEY_get0_provider
|
|
- key type and capabilities functions
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
int EVP_PKEY_is_a(const EVP_PKEY *pkey, const char *name);
|
|
int EVP_PKEY_can_sign(const EVP_PKEY *pkey);
|
|
int EVP_PKEY_type_names_do_all(const EVP_PKEY *pkey,
|
|
void (*fn)(const char *name, void *data),
|
|
void *data);
|
|
const char *EVP_PKEY_get0_type_name(const EVP_PKEY *key);
|
|
const char *EVP_PKEY_get0_description(const EVP_PKEY *key);
|
|
const OSSL_PROVIDER *EVP_PKEY_get0_provider(const EVP_PKEY *key);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
EVP_PKEY_is_a() checks if the key type of I<pkey> is I<name>.
|
|
|
|
EVP_PKEY_can_sign() checks if the functionality for the key type of
|
|
I<pkey> supports signing. No other check is done, such as whether
|
|
I<pkey> contains a private key.
|
|
|
|
EVP_PKEY_type_names_do_all() traverses all names for I<pkey>'s key type, and
|
|
calls I<fn> with each name and I<data>. For example, an RSA B<EVP_PKEY> may
|
|
be named both C<RSA> and C<rsaEncryption>.
|
|
The order of the names depends on the provider implementation that holds
|
|
the key.
|
|
|
|
EVP_PKEY_get0_type_name() returns the first key type name that is found
|
|
for the given I<pkey>. Note that the I<pkey> may have multiple synonyms
|
|
associated with it. In this case it depends on the provider implementation
|
|
that holds the key which one will be returned.
|
|
Ownership of the returned string is retained by the I<pkey> object and should
|
|
not be freed by the caller.
|
|
|
|
EVP_PKEY_get0_description() returns a description of the type of B<EVP_PKEY>,
|
|
meant for display and human consumption. The description is at the
|
|
discretion of the key type implementation.
|
|
|
|
EVP_PKEY_get0_provider() returns the provider of the B<EVP_PKEY>'s
|
|
L<EVP_KEYMGMT(3)>.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
EVP_PKEY_is_a() returns 1 if I<pkey> has the key type I<name>,
|
|
otherwise 0.
|
|
|
|
EVP_PKEY_can_sign() returns 1 if the I<pkey> key type functionality
|
|
supports signing, otherwise 0.
|
|
|
|
EVP_PKEY_get0_type_name() returns the name that is found or NULL on error.
|
|
|
|
EVP_PKEY_get0_description() returns the description if found or NULL if not.
|
|
|
|
EVP_PKEY_get0_provider() returns the provider if found or NULL if not.
|
|
|
|
EVP_PKEY_type_names_do_all() returns 1 if the callback was called for all
|
|
names. A return value of 0 means that the callback was not called for any
|
|
names.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
=head2 EVP_PKEY_is_a()
|
|
|
|
The loaded providers and what key types they support will ultimately
|
|
determine what I<name> is possible to use with EVP_PKEY_is_a(). We do know
|
|
that the default provider supports RSA, DH, DSA and EC keys, so we can use
|
|
this as an crude example:
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
...
|
|
/* |pkey| is an EVP_PKEY* */
|
|
if (EVP_PKEY_is_a(pkey, "RSA")) {
|
|
BIGNUM *modulus = NULL;
|
|
if (EVP_PKEY_get_bn_param(pkey, "n", &modulus))
|
|
/* do whatever with the modulus */
|
|
BN_free(modulus);
|
|
}
|
|
|
|
=head2 EVP_PKEY_can_sign()
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
...
|
|
/* |pkey| is an EVP_PKEY* */
|
|
if (!EVP_PKEY_can_sign(pkey)) {
|
|
fprintf(stderr, "Not a signing key!");
|
|
exit(1);
|
|
}
|
|
/* Sign something... */
|
|
|
|
=head1 HISTORY
|
|
|
|
The functions described here were added in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|