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ae12eac074
This adds the convenience function EVP_PKEY_typenames_do_all(), which does the same as EVP_KEYMGMT_names_do_all(), but without having to expose all the internal ways to find out if the internal EVP_PKEY key is legacy or provider-native. Reviewed-by: Shane Lontis <shane.lontis@oracle.com> (Merged from https://github.com/openssl/openssl/pull/12873)
95 lines
2.8 KiB
Plaintext
95 lines
2.8 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY_is_a, EVP_PKEY_can_sign, EVP_PKEY_typenames_do_all,
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EVP_PKEY_get0_first_alg_name
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- key type and capabilities functions
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_is_a(const EVP_PKEY *pkey, const char *name);
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int EVP_PKEY_can_sign(const EVP_PKEY *pkey);
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void EVP_PKEY_typenames_do_all(const EVP_PKEY *pkey,
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void (*fn)(const char *name, void *data),
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void *data);
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const char *EVP_PKEY_get0_first_alg_name(const EVP_PKEY *key);
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=head1 DESCRIPTION
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EVP_PKEY_is_a() checks if the key type of I<pkey> is I<name>.
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EVP_PKEY_can_sign() checks if the functionality for the key type of
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I<pkey> supports signing. No other check is done, such as whether
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I<pkey> contains a private key.
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EVP_PKEY_typenames_do_all() traverses all names for I<pkey>'s key type, and
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calls I<fn> with each name and I<data>. For example, an RSA B<EVP_PKEY> may
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be named both C<RSA> and C<rsaEncryption>.
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The order of the names is undefined.
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EVP_PKEY_get0_first_alg_name() returns the first algorithm name that is found
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for the given I<pkey>. Note that the I<pkey> may have multiple synonyms
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associated with it. In this case it is undefined which one will be returned.
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Ownership of the returned string is retained by the I<pkey> object and should
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not be freed by the caller.
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=head1 RETURN VALUES
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EVP_PKEY_is_a() returns 1 if I<pkey> has the key type I<name>,
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otherwise 0.
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EVP_PKEY_can_sign() returns 1 if the I<pkey> key type functionality
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supports signing, otherwise 0.
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EVP_PKEY_get0_first_alg_name() returns the name that is found or NULL on error.
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=head1 EXAMPLES
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=head2 EVP_PKEY_is_a()
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The loaded providers and what key types they support will ultimately
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determine what I<name> is possible to use with EVP_PKEY_is_a(). We do know
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that the default provider supports RSA, DH, DSA and EC keys, so we can use
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this as an crude example:
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#include <openssl/evp.h>
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...
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/* |pkey| is an EVP_PKEY* */
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if (EVP_PKEY_is_a(pkey, "RSA")) {
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BIGNUM *modulus = NULL;
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if (EVP_PKEY_get_bn_param(pkey, "n", &modulus))
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/* do whatever with the modulus */
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BN_free(modulus);
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}
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=head2 EVP_PKEY_can_sign()
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#include <openssl/evp.h>
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...
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/* |pkey| is an EVP_PKEY* */
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if (!EVP_PKEY_can_sign(pkey)) {
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fprintf(stderr, "Not a signing key!");
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exit(1);
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}
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/* Sign something... */
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=head1 HISTORY
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The functions described here were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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