- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUES
- SEE ALSO
- HISTORY
- COPYRIGHT

# NAME

EVP_PKEY_asn1_find, EVP_PKEY_asn1_find_str, EVP_PKEY_asn1_get_count, EVP_PKEY_asn1_get0, EVP_PKEY_asn1_get0_info - enumerate public key ASN.1 methods

# SYNOPSIS

The following functions have been deprecated since OpenSSL 3.6, and can be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value, see openssl_user_macros(7); use the provider API instead.

     #include <openssl/evp.h>

     int EVP_PKEY_asn1_get_count(void);
     const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_get0(int idx);
     const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pe, int type);
     const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe,
                                                        const char *str, int len);
     int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *pkey_base_id,
                                 int *ppkey_flags, const char **pinfo,
                                 const char **ppem_str,
                                 const EVP_PKEY_ASN1_METHOD *ameth);

# DESCRIPTION

EVP_PKEY_asn1_count() returns a count of the number of public key ASN.1 methods available: it includes standard methods and any methods added by the application.

EVP_PKEY_asn1_get0() returns the public key ASN.1 method idx. The value of idx must be between zero and EVP_PKEY_asn1_get_count() - 1.

EVP_PKEY_asn1_find() looks up the EVP_PKEY_ASN1_METHOD with NID type. If pe isn't NULL, then it will look up an engine implementing a EVP_PKEY_ASN1_METHOD for the NID type and return that instead, and also set *pe to point at the engine that implements it.

EVP_PKEY_asn1_find_str() looks up the EVP_PKEY_ASN1_METHOD with PEM type string str. Just like EVP_PKEY_asn1_find(), if pe isn't NULL, then it will look up an engine implementing a EVP_PKEY_ASN1_METHOD for the NID type and return that instead, and also set *pe to point at the engine that implements it.

EVP_PKEY_asn1_get0_info() returns the public key ID, base public key ID (both NIDs), any flags, the method description and PEM type string associated with the public key ASN.1 method *ameth.

EVP_PKEY_asn1_count(), EVP_PKEY_asn1_get0(), EVP_PKEY_asn1_find() and EVP_PKEY_asn1_find_str() are not thread safe, but as long as all EVP_PKEY_ASN1_METHOD objects are added before the application gets threaded, using them is safe. See EVP_PKEY_asn1_add0(3).

# RETURN VALUES

EVP_PKEY_asn1_count() returns the number of available public key methods.

EVP_PKEY_asn1_get0() return a public key method or NULL if idx is out of range.

EVP_PKEY_asn1_get0_info() returns 0 on failure, 1 on success.

# SEE ALSO

EVP_PKEY_asn1_new(3), EVP_PKEY_asn1_add0(3)

# HISTORY

These functions were deprecated in OpenSSL 3.6.

# COPYRIGHT

Copyright 2017-2025 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 https://www.openssl.org/source/license.html.