[#OSSL_DECODER_CTX_new_for_pkey]
= OSSL_DECODER_CTX_new_for_pkey
:mrdocs:

Create a decoder context preconfigured to decode an EVP_PKEY.

== Synopsis

Declared in `<openssl/decoder.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:OSSL_DECODER_CTX.adoc[OSSL_DECODER_CTX]*
OSSL_DECODER_CTX_new_for_pkey(
    xref:EVP_PKEY.adoc[EVP_PKEY]** pkey,
    char const* input_type,
    char const* input_struct,
    char const* keytype,
    int selection,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propquery);
----

== Return Value

New decoder context, or NULL on error; free with OSSL_DECODER_CTX_free().

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Address of a pointer set to the decoded key on success.
| *input_type*
| Expected encoding type (for example "DER"), or NULL.
| *input_struct*
| Expected ASN.1 structure name, or NULL.
| *keytype*
| Target key type name (for example "RSA"), or NULL.
| *selection*
| OSSL_KEYMGMT_SELECT_* mask for components to decode.
| *libctx*
| Library context, or NULL for the default.
| *propquery*
| Optional property query for decoder fetching, or NULL.
|===


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