.\" $OpenBSD: EVP_PKEY_asn1_get_count.3,v 1.7 2023/09/13 13:55:50 schwarze Exp $ .\" full merge up to: OpenSSL 72a7a702 Feb 26 14:05:09 2019 +0000 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2020, 2023 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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Redistributions of any form whatsoever must retain the following .\" acknowledgment: .\" "This product includes software developed by the OpenSSL Project .\" for use in the OpenSSL Toolkit (http://www.openssl.org/)" .\" .\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY .\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: September 13 2023 $ .Dt EVP_PKEY_ASN1_GET_COUNT 3 .Os .Sh NAME .Nm EVP_PKEY_asn1_get_count , .Nm EVP_PKEY_asn1_get0 , .Nm EVP_PKEY_get0_asn1 , .Nm EVP_PKEY_asn1_find , .Nm EVP_PKEY_asn1_find_str , .Nm EVP_PKEY_asn1_get0_info .Nd enumerate public key ASN.1 methods .Sh SYNOPSIS .In openssl/evp.h .Ft int .Fn EVP_PKEY_asn1_get_count void .Ft const EVP_PKEY_ASN1_METHOD * .Fo EVP_PKEY_asn1_get0 .Fa "int idx" .Fc .Ft const EVP_PKEY_ASN1_METHOD * .Fo EVP_PKEY_get0_asn1 .Fa "const EVP_PKEY *pkey" .Fc .Ft const EVP_PKEY_ASN1_METHOD * .Fo EVP_PKEY_asn1_find .Fa "ENGINE **pe" .Fa "int type" .Fc .Ft const EVP_PKEY_ASN1_METHOD * .Fo EVP_PKEY_asn1_find_str .Fa "ENGINE **pe" .Fa "const char *str" .Fa "int len" .Fc .Ft int .Fo EVP_PKEY_asn1_get0_info .Fa "int *ppkey_id" .Fa "int *pkey_base_id" .Fa "int *ppkey_flags" .Fa "const char **pinfo" .Fa "const char **ppem_str" .Fa "const EVP_PKEY_ASN1_METHOD *ameth" .Fc .Sh DESCRIPTION .Fn EVP_PKEY_asn1_get_count returns the number of public key ASN.1 methods available. It includes standard methods and any methods added by the application. .Pp .Fn EVP_PKEY_asn1_get0 returns the public key ASN.1 method .Fa idx . The value of .Fa idx must be in the range from zero to .Fn EVP_PKEY_asn1_get_count \- 1. .Pp .Fn EVP_PKEY_asn1_find looks up the method with NID .Fa type , which can be any of the values that .Xr EVP_PKEY_base_id 3 and .Xr EVP_PKEY_id 3 may return. If .Fa pe is not .Dv NULL , it first looks for an engine implementing a method for the NID .Fa type . If one is found, .Pf * Fa pe is set to that engine and the method from that engine is returned instead. .Pp .Fn EVP_PKEY_asn1_find_str looks up the method with the PEM type string given by the first .Fa len bytes of .Fa str . If .Fa len is \-1, the .Xr strlen 3 of .Fa str is used instead. The PEM type strings supported by default are listed in the .Xr EVP_PKEY_base_id 3 manual page. Just like .Fn EVP_PKEY_asn1_find , if .Fa pe is not .Dv NULL , methods from engines are preferred. .Pp .Fn EVP_PKEY_asn1_get0_info retrieves the public key ID as returned by .Xr EVP_PKEY_id 3 , the base public key ID as returned by .Xr EVP_PKEY_base_id 3 .Pq both NIDs , any flags, and internal pointers owned by .Fa ameth pointing to its method description string and its PEM type string. .Pp The following flags bits can occur, OR'ed together in .Pf * Fa ppkey_flags : .Bl -tag -width Ds .It Dv ASN1_PKEY_ALIAS This .Fa ameth object serves as an alias for another .Vt EVP_PKEY_ASN1_METHOD object and will never be returned from .Fn EVP_PKEY_asn1_find or .Fn EVP_PKEY_asn1_find_str . It is either an alias built into the library, or it was created with .Xr EVP_PKEY_asn1_add_alias 3 . .It Dv ASN1_PKEY_DYNAMIC This .Fa ameth object is marked as dynamically allocated. If this flag is set, .Xr EVP_PKEY_asn1_free 3 can free .Fa ameth ; otherwise, .Xr EVP_PKEY_asn1_free 3 has no effect on it. .It Dv ASN1_PKEY_SIGPARAM_NULL If the signing .Fa ctx uses an .Vt EVP_PKEY private key associated with this .Fa ameth , instruct .Xr ASN1_item_sign_ctx 3 to use a parameter type of .Dv V_ASN1_NULL instead of the default .Dv V_ASN1_UNDEF when encoding the ASN.1 .Vt AlgorithmIdentifier objects with .Xr X509_ALGOR_set0 3 . In particular, this is used for .Dv EVP_PKEY_RSA . .El .Pp .Fn EVP_PKEY_asn1_get_count , .Fn EVP_PKEY_asn1_get0 , .Fn EVP_PKEY_asn1_find and .Fn EVP_PKEY_asn1_find_str are not thread safe, but as long as all .Vt EVP_PKEY_ASN1_METHOD objects are added before the application gets threaded, using them is safe. See .Xr EVP_PKEY_asn1_add0 3 . .Sh RETURN VALUES .Fn EVP_PKEY_asn1_get_count returns the number of available public key methods. .Pp .Fn EVP_PKEY_asn1_get0 returns a public key method or .Dv NULL if .Fa idx is out of range. .Pp .Fn EVP_PKEY_get0_asn1 returns the public key method used by .Fa pkey . .Pp .Fn EVP_PKEY_asn1_find and .Fn EVP_PKEY_asn1_find_str return a matching public key method or .Dv NULL if no match is found. .Pp .Fn EVP_PKEY_asn1_get0_info returns 1 on success or 0 on failure. .Sh SEE ALSO .Xr EVP_PKEY_asn1_new 3 , .Xr EVP_PKEY_base_id 3 , .Xr EVP_PKEY_new 3 .Sh HISTORY These functions first appeared in OpenSSL 1.0.0 and have been available since .Ox 4.9 .