[#EVP_PKEY_get_octet_string_param]
= EVP_PKEY_get_octet_string_param
:mrdocs:

Read an octet‐string parameter from a key by OSSL_PKEY_PARAM name.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_get_octet_string_param(
    xref:EVP_PKEY.adoc[EVP_PKEY] const* pkey,
    char const* key_name,
    unsigned char* buf,
    size_t max_buf_sz,
    size_t* out_sz);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Key to query.
| *key_name*
| Parameter name (for example OSSL_PKEY_PARAM_PUB_KEY).
| *buf*
| Destination buffer, or NULL to only query the required size.
| *max_buf_sz*
| Capacity of `buf` in bytes.
| *out_sz*
| Receives the parameter length in bytes.
|===


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