[#PEM_read_bio_PrivateKey_ex]
= PEM_read_bio_PrivateKey_ex
:mrdocs:

Read a private key from a PEM‐encoded BIO with an explicit library context.

== Synopsis

Declared in `<openssl/pem.h>`

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

== Return Value

Private key on success, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bp*
| BIO to read from.
| *x*
| Optional address of an EVP_PKEY pointer to reuse, or NULL.
| *cb*
| Password callback for encrypted PEM / PKCS#8, or NULL.
| *u*
| Application data passed to `cb.`
| *libctx*
| Library context used for provider‐backed decoding, or NULL for the default.
| *propq*
| Property query for algorithm fetches, or NULL.
|===


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