[#PEM_write_bio_PUBKEY_ex]
= PEM_write_bio_PUBKEY_ex
:mrdocs:

Write a SubjectPublicKeyInfo public key to a BIO with a library context.

== Synopsis

Declared in `<openssl/pem.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PEM_write_bio_PUBKEY_ex(
    xref:BIO.adoc[BIO]* bp,
    xref:EVP_PKEY.adoc[EVP_PKEY] const* x,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bp*
| BIO to write to.
| *x*
| Public key to encode.
| *libctx*
| Library context used for provider‐backed encoding, or NULL for the default.
| *propq*
| Property query for algorithm fetches, or NULL.
|===


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