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.IX Title &quot;EVP_PKEY_ASN1_GET_COUNT 3&quot;
.TH EVP_PKEY_ASN1_GET_COUNT 3 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
.\&quot; For nroff, turn off justification.  Always turn off hyphenation; it makes
.\&quot; way too many mistakes in technical documents.
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.nh
.SH &quot;NAME&quot;
EVP_PKEY_asn1_find, EVP_PKEY_asn1_find_str, EVP_PKEY_asn1_get_count, EVP_PKEY_asn1_get0, EVP_PKEY_asn1_get0_info \&amp;\- enumerate public key ASN.1 methods
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/evp.h&gt;
\&amp;
\&amp; int EVP_PKEY_asn1_get_count(void);
\&amp; const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_get0(int idx);
\&amp; const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pe, int type);
\&amp; const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe,
\&amp;                                                    const char *str, int len);
\&amp; int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *pkey_base_id,
\&amp;                             int *ppkey_flags, const char **pinfo,
\&amp;                             const char **ppem_str,
\&amp;                             const EVP_PKEY_ASN1_METHOD *ameth);
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
\&amp;\fBEVP_PKEY_asn1_count()\fR returns a count of the number of public key
\&amp;\s-1ASN.1\s0 methods available: it includes standard methods and any methods
added by the application.
.PP
\&amp;\fBEVP_PKEY_asn1_get0()\fR returns the public key \s-1ASN.1\s0 method \fBidx\fR.
The value of \fBidx\fR must be between zero and \fBEVP_PKEY_asn1_get_count()\fR
\&amp;\- 1.
.PP
\&amp;\fBEVP_PKEY_asn1_find()\fR looks up the \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR with \s-1NID\s0
\&amp;\fBtype\fR.
If \fBpe\fR isn't \fB\s-1NULL\s0\fR, then it will look up an engine implementing a
\&amp;\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR for the \s-1NID\s0 \fBtype\fR and return that instead,
and also set \fB*pe\fR to point at the engine that implements it.
.PP
\&amp;\fBEVP_PKEY_asn1_find_str()\fR looks up the \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR with \s-1PEM\s0
type string \fBstr\fR.
Just like \fBEVP_PKEY_asn1_find()\fR, if \fBpe\fR isn't \fB\s-1NULL\s0\fR, then it will
look up an engine implementing a \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR for the \s-1NID\s0
\&amp;\fBtype\fR and return that instead, and also set \fB*pe\fR to point at the
engine that implements it.
.PP
\&amp;\fBEVP_PKEY_asn1_get0_info()\fR returns the public key \s-1ID,\s0 base public key
\&amp;\s-1ID\s0 (both NIDs), any flags, the method description and \s-1PEM\s0 type string
associated with the public key \s-1ASN.1\s0 method \fB*ameth\fR.
.PP
\&amp;\fBEVP_PKEY_asn1_count()\fR, \fBEVP_PKEY_asn1_get0()\fR, \fBEVP_PKEY_asn1_find()\fR and
\&amp;\fBEVP_PKEY_asn1_find_str()\fR are not thread safe, but as long as all
\&amp;\fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR objects are added before the application gets
threaded, using them is safe.  See \fBEVP_PKEY_asn1_add0\fR\|(3).
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
\&amp;\fBEVP_PKEY_asn1_count()\fR returns the number of available public key methods.
.PP
\&amp;\fBEVP_PKEY_asn1_get0()\fR return a public key method or \fB\s-1NULL\s0\fR if \fBidx\fR is
out of range.
.PP
\&amp;\fBEVP_PKEY_asn1_get0_info()\fR returns 0 on failure, 1 on success.
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBEVP_PKEY_asn1_new\fR\|(3), \fBEVP_PKEY_asn1_add0\fR\|(3)
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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